THERMAL FOLDING ADHESIVE BASED ON OLEFINE BLOCK COPOLYMERS

专利摘要:
olefin block copolymer-based hot melt adhesive a hot melt adhesive composition comprising a mixture of components including about 5-50% by weight of an olefin block copolymer, about 10-70% by weight of a first adhesive resin, about 0-65% of a second adhesive resin, about 0-60% by weight of a plasticizer; about 0-20% by weight of a reinforcing aromatic resin, about 0.1-5% by weight of a stabilizer, and about 1-40% by weight of a secondary polymer, the first and second adhesive resin and the reinforcing resin having a crystallinity of 250 joules / gram or less, wherein the components amount to 100% by weight of the composition, and the viscosity of the composition is equal to or less than about 20,000 mpa * s at 163 ° C. laminates, and methods of manufacturing such laminates using hotmelt adhesive are also described. The adhesive and / or laminate composition may be used in a variety of end products.
公开号:BR112012001614B1
申请号:R112012001614-8
申请日:2010-07-23
公开日:2019-11-26
发明作者:Mark D. Alper；Monina D. Kanderski
申请人:Bostik, Inc.；
IPC主号:

专利说明:

THERMOFUSIBLE ADHESIVE BASED ON OLEFIN BLOCK COPOLYMERS
BACKGROUND OF THE INVENTION
The current invention relates to hot-melt adhesives, and more particularly to a hot-melt adhesive using an olefin block copolymer (OBC) to provide high initial bond strength to produce elastic components such as laminates containing elastic filaments for use in disposable diapers. .
The increasing complexity of manufactured goods, in particular disposable goods, also leads to major improvements and development in the hotmelt adhesive industry. Hotmelt adhesives are being used to bond a wider variety of substrates, within a broader adhesive application, and for a large end-use portfolio. For example, considering the diaper manufacturing industry, the materials involved may be non-woven materials, polymeric films, and elastomeric components in general. These elastomeric components can be used in products such as diapers, in the form of filaments, films, and any other non-woven or continuous or segmented shapes.
The processing capacity of hot melt adhesives is linked to its ability to be melted, and transported and / or coated in a molten stage to the final position where bonding is required. Usually the melted adhesive is sprayed, or coated as a film. Once cooled, the adhesive must meet multiple requirements, such as bond strength measured by peeling strength or bond retention under or after mechanical stress, and under or after various thermal circumstances.
Typically hotmelt adhesives can be based on polymers such as polyolefins (polymers based on ethylene or propene), or functionalized polyolefins (ethylene or propylene oxygen copolymers containing monomers), or styrenic block copolymers containing at least 30 phase rubber, such as styrene-isoprene-styrene polymers (SIS), or styrene-butadiene-styrene (SBS). Styrenic block copolymers are of interest due to their double characteristics, that is, cohesion of the styrenic phase associated with the rubber behavior of another phase. Typical application temperatures are equal to, or greater than, 150 ° C.
Over the years, many different olefinic polymers have been used in the formulation of hot melt adhesives used in the construction of soft goods
2/38 disposable. The first of these was amorphous polypropylene (APP). This material was produced as a by-product of crystalline polypropylene and was obtained by solvent extraction. This APP polymer could be combined with various tachyants, plasticizers, waxes, etc. to produce a thermofusible that could be used for making diapers, for example.
Subsequently, polymers became available, which were produced in order to have many improved properties compared to the original APP polymers. These have been referred to as amorphous poly alpha olefins (APAO). These were first produced using the Ziegler-Natta catalyst and could be made using a variety of monomers including, but not limited to, propylene, ethylene and butene. The various copolymers and terpolymers are produced by a number of manufacturers. These include Evonik Industries, which produce Vestoplast® polymers; REXtac, LLC, which produces the material variations of Rextac® RT and Eastman Chemical, manufacturers of the Eastoflex® polymer line. All are characterized by having a very low degree of crystallinity as measured by DSC. As commercially produced, they are random polymers that have wide molecular weight distributions.
When formulated in hot-melt adhesives for the production of disposable articles, they had some shortcomings. Generally these did not show resistance to high temperature heat (particularly resistance to creep) so they were not used for elastic attachment. This was due to its amorphous character. While a widespread use for the application in the manufacture of diapers (connecting the non-woven polyethylene) was discovered, they did not have the level of resistance to the high temperature creep necessary for the application of elastic attachment.
Another reason why hot melt adhesives based on APAO were not used for elastic attachment was their poor spraying ability. As the fabrication application is applied in a variety of ways, the elastic adhesive is almost always applied using the spray application equipment. Compared to the manufacturing application, the application of the sprayer for elastic attachment is much more demanding. The adhesive is generally applied hotter and at a higher level of addition than the construction application. This can cause burn problems in the passage if not applied correctly. In addition, the elastic application needs to be applied exactly, which is directly on the elastic filaments, rather than a
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i.
construction of general application.
Historically, traditional polyolefins such as polyethylene or polypropylene have not been used for any of the diaper construction applications. When these polymers are used in hot-melt adhesives for packaging applications (for example, compartment sealing and cardboard), they do not have the adhesion, opening time and spray capacity required for disposable applications. Examples of these types of polymers include Epolene® polymers from Westlake Chemical Company.
More recently, metallocene catalysis has been used to make polyolefins with more precisely suited properties. For example, the molecular weight of the polymer can be controlled in a way that is not possible with older Ziegler-Natta catalysts. Polymers can be made using high levels of the comonomer, such as butene-1 and octene1, to produce polymers with very low levels of crystallinity and density. While these polymers were used to make hotmelt adhesives with better adhesion characteristics, they were not widely used in the nonwoven industry because of their lack of sprayability. Examples of these metallocene polymers include Affinity® and Engage® polymers from Dow Chemical Company.
The standard in the disposable industry in terms of sprayability was thermofusible based on styrenic block copolymers, specifically styrene-isoprene-styrene (SIS) block copolymers. No olefin-based polymer has been able to combine the characteristics of styrenic block copolymers and the ease of spraying ability and application window. The term "application window" means the variety of circumstances in which a particular adhesive will be applied well. For example, if a particular hotmelt adhesive can only be applied over a narrow range of temperatures, flow rates, air pressures, opening periods, etc. it is described as having a narrow application window. If on the one hand the adhesive can be applied under a wide range of circumstances and still produce acceptable bonds, it is described as having a wide application window. It is very important that products used in the manufacture of disposable goods have a wide application window to minimize downtime and leftovers during fluctuations in line speed that occur during line startup, for example, or fluctuations in temperature that can happen during the production. As these lines of
4/38 manufacturing often operate at line speeds of over 1000 feet per minute, it is important to minimize leftovers.
Polyolefin polymers are produced in a very wide range of molecular weights, monomers, densities and levels of crystallinity. They are also made using an ever-increasing range of catalysts. There is a Ziegler-Natta catalyst, metallocene and other catalysts from unique locations and more recently those that can produce block polyolefins.
These polymers vary in crystallinity from very low, as with amorphous polypropylene or amorphous poly-alpha-olefins, to those that are very high, such as isotactic polypropylene. The crystallinity of a polymer can be determined by Differential Scanning Calorimetry (DSC) or X-ray diffraction techniques. DSC is the most widely used technique. The fusion enthalpy (also known as the latent heat of melting or heat of fusion) can be measured and quantified using ASTM E793-01 entitled “Standard Test Method of Enthalpies of Fusion and Cristallization by Differential Scanning calorimetry”. Fusion enthalpy is the amount of energy required to melt the crystalline portion of the polymer. This value is usually reported in joules / gram (J / g).
This number varies widely from almost zero to 250 joules / gram depending on the crystallinity of the polymer. Ideally, a truly amorphous polymer would have no crystallinity, no melting point and therefore zero melting enthalpy. As indicated in US Patent No. 7,524,911 (column 8, lines 30-33), the term "amorphous" refers to a polymer that does not have a crystalline melting point as determined by differential calorimetry scanning (DSC) or by equivalent technique.
As a practical matter, most polymers that are sold as "amorphous poly-alpha-olefins" (APAO) have some low level of crystallinity. On the one hand, polymers that are considered crystalline are not 100 percent crystalline. In the '911 patent it is indicated in column 8, line 26-30, Ό term "crystalline" refers to a polymer that has a first order transition or crystalline melting point (Tm) as determined by differential calorimetry scanning (DSC ) or equivalent technique, and this term can be used interchangeably with the term “semi-crystalline”
It is useful to have some quantifiable limit between what is considered amorphous polymer and those considered semi-crystalline or crystalline. US patent No. 6,747,114 indicates in column 8, line 9-14, the semi-crystalline polymer has
5/38 preferably a heat of fusion of approximately 30 J / g to approximately 80 J / g as determined by DSC, more preferably of approximately 40 J / g to approximately 70 J / g as determined by DSC, and most preferably of approximately 50 J / ga approximately 65 J / g as determined by DSC.
Bostik's internal analysis correlates with the above descriptions. Amorphous polyalpha olefins are in fact not entirely amorphous and do not have a very low level of crystallinity as measured by DSC. Analysis of many of the grades sold by Eastman Chemical Co. as amorphous polyolefins under the trade name Eastoflex® and those sold by Evonik Industry as amorphous polyalphaolefins under the trade name Vestoplast® and those manufactured by REXtac, LLC as REXtac® RT shows that everyone has an enthalpy (or heat) of fusion of less than 25 joules / gram. The single highest value obtained was 20.4 joules / gram for Vestoplast® 708. One of the two grades shown in US Patent No. 7,517,579 (assigned to Kimberly-Clark Worldwide, Inc.) is RT2730, which has a melting heat of 9.4 joules / gram. The other class that is mentioned is RT2723, which according to the usual REXtac nomenclature must be a lower viscosity version of RT2730 with the same ratios as the monomer. Therefore, the fusion enthalpy should be similar to RT2730. In summary, currently available data strongly indicate that the entire class of polymer currently sold as an amorphous poly-alpha-olefin would have a melting enthalpy value of less than approximately 25 joules / gram.
A wide range of other polyolefins are produced by a variety of manufacturers that fall into the category of semi-crystalline polymers. They have melting heat values greater than approximately 30 joules / gram, which puts them off the APAO scale. For example, ethylene vinyl acetate copolymers range from approximately 35 joules / gram for a high grade vinyl acetate (40% VA) to approximately 73 joules / gram for a lower grade of vinyl acetate (18% VA). Polyalphaolefins such as Dow's Affinity® (ethylene / octane copolymers) have variations in the range of approximately 52 joules / gram for Affinity® 8200, a relatively low density class (0.870g / cc, Ml = 5) at 77 J / g for a higher density class (0.900 g / cc, Ml = 6) Affinity® called PL 1280. Dow also manufactures a high degree of melt index (0.870 g / cc, MI = 1000) called GA1900 specifically for hotmelt adhesives which has a melting heat of 57 joules / gram. Clearly, these Affinity® polymers could not be considered to be
6/38 amorphous and are not amorphous poly-alpha-olefins.
A more recent development in the area of polyolefins is the so-called olefin block copolymers or OBC. This is an entirely new class of polyolefin polymer produced using a chain moving catalyst that produces a linear block structure of monomers rather than a random polymer produced by Ziegler-Natta or by traditional metallocene technology. At this time, they are manufactured by Dow Chemical under the trade name Infuse®. OBCs consist of crystallizable ethylene-octene (hard) blocks with a very low comonomer index and the high melting temperature that alternates with the amorphous ethylene-octene (soft) blocks with a high comonomer index and low glass transition temperature . This produces for the polymer a better resistance to high temperature and elasticity compared to a random polymer of the typical metallocene of similar density. When some of the Infuse® grades have low heat of fusion (approximately 20 joules / gram) they could not be considered to be amorphous polyalpha-olefins because the polymer architecture is completely different (ie random block x) and is produced specifically for have crystalline regions. Not only are they different on a structural basis, they are very different from a physical property point of view with OBCs having better elastic recovery, adjusted resistance and high temperature resistance. Thus, these are sold in markets for different end uses that are not considered equivalent to one another.
US Patent No. 7,524,911 and WO 2009/029476 disclose adhesive compositions based on the olefin block copolymers (OBC). Other references that disclose OBCs and various applications for OBCs include WO 2006/101966, WO 2006/102016, WO 2008/005501, and WO 2008/067503.
Summary of the invention
The current invention is based on an original formulation using an olefin block copolymer (OBC), particularly for elastic attachment and construction in diaper structures. The current invention addresses the very important requirement of having an olefin-based hotmelt adhesive capable of being sprayed using the same application techniques used today, such as coating techniques and addition levels, and providing the end-use application with the same level of performance expected with current technologies based on SIS and SBS, that is. High levels of bond strength in terms of creep resistance, peeling strength and bond retention in general
7/38 with mechanical resistance and heat resistance. When formulated in a hot melt adhesive, the OBCs offer improved spray characteristics compared to APAO based adhesives or those based on older generations of polyolefins. In particular, when formulated in combination with an APAO or other polymers with low crystallinity, a hotmelt adhesive can be produced with a unique combination of adhesion, high temperature creep resistance and sprayability. This combination of properties was obtained previously without using a styrenic block copolymer. In addition, compared to conventional adhesives based on SIS or SBS, OBC offers improved viscosity stability when stored at elevated temperatures. Finally, OBC is thermally stable at elevated temperatures.
Various methods are conventionally used to coat a hot melt adhesive with reasonably low viscosity on a substrate. This can be done by scroll coating or a printing method, or by slot coating, extrusion or spray gun. The spray gun techniques are numerous and can be done with or without the aid of compressed air that would form the adhesive spray, and consequently the adhesive pattern. The hotmelt adhesive material is generally allowed to melt in the tanks, and is then pumped through the hoses to the end point of coating the substrate. For the current invention, the preferred methods of applying the adhesive would be by applying the spray, most preferably aided by air. Among these techniques, the most common are the spiral spray (Controlled Fiberization ™ by Nordson), Summit ™ by Nordson, Surewrap ™ by Nordson, Omega ™ by ITW, Curtain Coating ™ by Nordson and various melt blown processes.
For the current invention, the temperature at which the hotmelt adhesive is applied must be below 170 ° C, so that heat sensitive substrates would not be damaged. Preferably, this temperature should be equal to or below 150 ° C.
Also, the viscosity (as measured by ASTM D3236-88) of the adhesive material should generally be less than 20,000 mPa.s, more preferably less than 15,000 mPa.s, more preferably less than 12,000 mPa.s measured in 163 ° C (325 ° F). An adhesive with such a low viscosity needs to be operated through the standard hotmelt adhesive equipment and achieve the correct standard and therefore the correct performance
8/38 connection at application temperature.
The adhesive of the current invention can be used with the entire process of conventional construction or elastic accessory technology as known in the prior art.
The adhesive of the current invention can be used with any application where the various substrate materials are involved as non-woven materials, polymeric films, and general elastomeric components applied to articles such as diapers, in the form of filaments, films, non-woven or any other continuous or segmented form. All substrate material and any form of substrate could be used in any combination possible, in the adhesive reserving to join two or more substrates. The substrates can be of multiple shapes, for example, fibers, film, yarn, strip, tape, coating, sheet, strip. The substrate can be any known composition, for example, polyolefin, polyacrylic, polyester, polyvinyl chloride, polystyrene, cellulosic such as wood, cardboard and paper, or made of mineral compounds such as concrete, glass or ceramic. The mechanical behavior of the substrate can be rigid, plastic or elastomeric. Among the elastomeric materials are various examples such as natural or synthetic rubber, copolymers based on polyurethane, polyether or polyester urethanes, copolymers of styrene or starch block, or olefinic copolymers. The above lists are non-limiting or inclusive, but are provided as common examples only. In the current invention, various methods for processing hotmelt adhesives can be employed, linked to their ability to be melted, and transported and / or coated or sprayed in a melted stage to the final position where bonding is required.
The adhesive of the current invention can also be used with any application where compounds and disposable products are made with the aid of bonding parts together with a hotmelt adhesive used at a temperature below 170 ° C, preferably equal to or below 150 ° C, when obtaining the proper bonding cohesion of the adhesive to withstand the mechanical stress at low, ambient or high temperature, in particular, under drag conditions. Diapers, adult incontinence products, sanitary wipes and other disposable absorbent products are ideal applications for the adhesive composition of the invention, as well as bed pads, absorbent pads, surgical gowns and other related medical or surgical devices. Construction applications, structural applications or packaging applications, in particular disposable packaging items and
9/38 food packaging, may also be applications where the invention is useful. The most specific application of the current hotmelt adhesive is for the elastic accessory, where the current invention allows the bonding of the elastic supports to substrates of the film when applying the adhesive at a temperature below 170 ° C, preferably equal to or below 150 ° Ç.
The good performance for the elastic accessory in a diaper application is typically when the bond retention is any greater than 60%, preferably greater than 70%, more preferably greater than 75%, more preferably greater than 80% in a specific test described below when it is done within 2 days after the adhesive has been applied to substrates (initial creep test). These tests are indicative that the level of adhesion and creep resistance (or bond retention) can be achieved by an adhesive. Because of the savings involved in production and material cost, the preferred additive adhesives for a spiral spray application are below 18 gsm ("gsm" refers to the grams of adhesive material per square meter of substrate covered by the adhesive material), more preferably equal to or below 15 gsm and more preferably equal to or below 12 gsm. If individual filament coating techniques are used, the level of addition is generally less than 60mg / filaments / meter. For construction applications, the level of addition is typically 6 grams / square meter or less. For other applications, the levels of addition will vary depending on the specific requirements of the end use.
Accordingly, the current invention provides a hotmelt adhesive composition, comprising a mixture of the following components:
Approximately 5% to approximately 50%, preferably approximately 10% to approximately 30%, and more preferably approximately 12% to approximately 20%, by weight, of an olefin block copolymer (OBC);
Approximately 10% to approximately 70%, preferably approximately 40% to approximately 65%, and more preferably approximately 50% to approximately 60%, by weight, of a first tachyting resin that has a softening point of at least approximately 95 ° C and preferably a softening point of approximately 95 ° C to approximately 140 ° C;
Approximately 0% to approximately 65% of a second taching resin that is different than the first taching resin;
10/38
It
Approximately 0% to approximately 60%, preferably approximately 2% to approximately 30%, more preferably approximately 3% to approximately 20%, by weight, of a plasticizer;
Approximately 0% to approximately 20%, preferably approximately 2% to approximately 15%, approximately 4% more preferable to approximately 12%, and more preferably approximately 6% to approximately 10%, by weight of an aromatic reinforcing resin having a point softening rate equal to or greater than 115 ° C;
Approximately 0.1% to approximately 5% of a stabilizer or antioxidant; and
Approximately 1% to approximately 40%, preferably approximately 2% to approximately 35%, and more preferably approximately 2% to approximately 30%, by weight of a secondary polymer other than OBC, the first and second taching resins and the reinforcing resin, having relatively low crystallinity, where the low crystallinity is equal to or less than 250 joules / gram (J / g), preferably equal to or less than 150 joules / gram, and more preferably equal to or less than 100 joules / gram ; as well as mixtures of each of the above components;
Where the components total 100% by weight of the composition, and the viscosity (measured by ASTM D3236-88) of the composition is equal to or less than approximately 20,000 mPa.s at 163 ° C (325 ° F), preferably equal to or less than 15,000 mPa.s at 163 ° C, and more preferably equal to or less than 12,000 mPa.s at 163 ° C.
Although the primary polymer component in the current adhesive composition is an OBC, and the secondary polymer must have relatively low crystallinity, mixtures of the OBC and the secondary polymer which contain approximately 1% to approximately 25% by weight, preferably approximately 1% to approximately 15% by weight of an additional auxiliary polymer comprising EVA or a styrenic block copolymer such as, SIS, SI, SBS, SB, SIBS, SEB, SEBS, SEP, SEPS, SBBS, SEEPS and mixtures of each of these, can also be used as long as the additional auxiliary polymer is compatible. The auxiliary polymer is a polymer that is different from OBC, the first and second tachyting resins, the reinforcement resin, and the secondary polymer, and functions to provide a desired physical property, depending on the end use of the adhesive composition.
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The relatively small amounts (0-20% by weight) of a more crystalline material such as a wax can also be used as long as it does not interfere with the level of performance for the required end use.
The present invention also provides a laminate comprising a first layer of non-woven material, a second layer of non-woven material, and one or a plurality of elastomeric substrates, disposed between the first and the second non-woven layer, connected together with the OBC-based adhesive composition.
The laminate may also comprise a first layer of non-woven material, a second layer of film material, and one or a plurality of elastomeric substrates disposed between said first and second layers, connected together with the OBC-based adhesive composition. The film material can comprise a polyethylene film, a polypropylene film, an ethylene-propylene copolymer film or woven film-coated material, and the elastomeric substrate is preferably a plurality of elastic filaments.
The laminate may further comprise a first layer of non-woven material bonded to a second layer of film or non-woven material with the adhesive composition, and without any elastomeric substrate between them.
The composition and / or adhesive laminate of the current invention can be used to make a variety of end products. Examples include disposable diapers, sanitary wipes, a bed pad, bandage, a surgical gown, an adhesive tape, a tag, a plastic sheet, a nonwoven sheet, a sheet of paper, a cardboard, a book, a filter, or a package.
However, in another aspect the current invention provides a method of making a laminate that comprises the steps of feeding a first substrate in a first direction; feeding a second substrate spaced from the first substrate in such a first direction; applying the adhesive composition to one or both of such substrates; and compressing such substrates together to form the laminate.
When an elastomeric laminate is desired, the method includes the additional steps of feeding one or a plurality of substrates or elastomeric substrates between such first and second substrates in such a first direction, such elastomeric substrates are stretched before, during or after the adhesive application; and applying the adhesive composition to such an elastomeric substrate or substrates or one or both of these substrates before compressing the substrates together. The elastomeric substrate is preferably a plurality of filaments
12/38 elastic each up to 500% stretched from its initial relaxed state.
DETAILED DESCRIPTION OF THE INVENTION
A tachyting resin, as defined in the current description, can be a molecule or macro-molecule, usually a chemical compound or a polymer of reasonably low molecular weight compared to ordinary polymers, a natural source or a chemical process or a combination of these that in general enhance the adhesion of a final composition of hot melt adhesive.
The hot melt adhesive compositions of the present invention also comprise a solid tachyant that is compatible with the OBC copolymer. Representative resins include C5 / C9 hydrocarbon resins, synthetic polyterpenes, resin, resin esters, natural terpenes, and the like. More particularly, useful tactifying resins include all colonies or compatible mixtures thereof such as (1) natural and modified resin including gum resin, wood resin, pine resin, distilled resin, hydrogenated resin, dimerized resin, and polymerized resin; (2) glycerol and pentaerythritol esters of natural and modified resins, including pale wood resin glycerol ester, hydrogenated resin glycerol ester, polymerized resin glycerol ester, hydrogenated resin pentaerythritol ester, and the phenolic-modified ester of the resin pentaerythritol; (3) copolymers and terpolymers of natural terpenes, such as styrene / terpene and methyl alpha / terpene styrene; (4) polyester pen resins that generally result from the polymerization of terpene hydrocarbons, such as the bicyclic monoterpene known as pinene, in the presence of Friedel-Crafts catalysts at moderately low temperatures; hydrogenated polyester pen resins are also included; (5) modified phenolic terpene resins and hydrogenated derivatives thereof, for example, such as the condensation resin product, in an acidic medium of a bicyclic terpene and a phenol; (6) petroleum hydrocarbon aliphatic resins resulting from the polymerization of monomers which consist primarily of olefins and diolefins; hydrogenated aliphatic resins of petroleum hydrocarbon are also included; and (7) cyclic petroleum hydrocarbon resins and their hydrogenated derivatives. Mixtures of two or more of the aforementioned resins may be necessary for some formulations. Also included are C5 cyclic or acyclic resins and modified aromatic acyclic or cyclic resins.
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The taching resin should have a softening point of the ring and ball (measured by ASTM E28) at least approximately 95 ° C, and preferably between approximately 95 ° C and approximately 140 ° C, and most preferably the softening point is between approximately 95 ° C and above 115 ° C. A more preferred tachyting resin is dicyclopentadiene modified hydrogenated aromatic resin with a ring and ball softening point between approximately 100 ° C to 115 ° C. the most preferred tachyting resins are entirely hydrogenated resins regardless of type such as aliphatic or cycloaliphatic hydrocarbon resins such as, Eastotac® H100W, or Sukorez® SU210, a pure aromatic monomer resin such as Regalrez 1094, and DCPD (dicyclopentadiene) resins with none aromatic index such as Escorez 5400.
Also, other preferred tachyting resins are partially hydrogenated hydrocarbon aliphatic resins such as Eastotac H100L and Eastotac H100R, as well as non-hydrogenated aliphatic C5 resins and aromatic modified C5 resins with low aromaticity such as Piccotac 1095 and Piccotac 9095, respectively .
Tachifiers are generally present in the adhesive compositions in an amount greater than the amount of the OBC block copolymer. Within this scale, amounts of approximately 10 to 70% by weight of the composition, preferably approximately 40 to 65% are used by weight, and more preferably approximately 50 to 60% by weight. Mixtures of two or more tachyting resins can also be used. For example, a mixture of a first taching resin and a second taching resin that is different than the first taching resin can also be employed. From approximately 0% to approximately 65% by weight of one or more additional tachyting resin can be mixed together with the first tachyting resin if desired.
The primary component of the polymer used in a hotmelt adhesive formula according to the current invention is an olefin block copolymer (OBC).
An olefin block copolymer or OBC is a more recent development in the field of polyolefins. This is an entirely new class of polyolefin polymers produced using chain transport catalysis technology that produces a linear block structure of monomers rather than a random polymer produced by Ziegler-Natta or by technology
Traditional 14/38 metallocene. At the moment, they are all manufactured by Dow Chemical under the trade name Infuse®. OBCs consist of crystallizable ethylene-octene (hard) blocks with a very low comonomer index and high melting point alternating with the amorphous ethylene-octene (soft) blocks with a high comonomer content and low glass transition temperature. This gives the polymer better resistance at elevated temperature and elasticity compared to a random polymer from the typical metallocene of similar density. These polymers are described in WO 2006/101966 and others attributed to Dow Chemical Co.
Olefin block copolymers should not be considered amorphous poly-alphaolefins because the polymer architecture is completely different (ie, counter-random block) and is produced specifically to have crystalline regions. In addition, OBCs are significantly narrower in polydispersity than other traditional olefins used, for example APAOs, which impact their melt profiles as measured by DSC (Differential calorimetry scanning). It is these structural differences, in combination with the narrow poly-dispersion of OBCs that provides a hotmelt adhesive with improved hot adhesion, adhesion, and cold temperature flexibility without affecting its total high temperature resistance.
The OBC copolymer can be incorporated into the composition in amounts of approximately 5% to approximately 50% by weight, preferably from approximately 10% to approximately 30% by weight, and more preferably from approximately 12% to approximately 20% by weight. Olefin block copolymers (OBCs) are polyolefins with alternating blocks of hard (highly rigid) and soft (highly elastomeric) segments. The OBC block structure offers the advantage of the balanced performance of flexibility and the ability to spray compared to random polyolefin copolymers. OBC is commercially available from Dow Chemical Company under the trade name Infuse® in different grades that are distinct based primarily on their density and weight% crystallinity as follows:
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Degree, OBD Density(afcMÒ ...... melting index Infused981.7 0.177 ' 15 Infused9807 0.866 15
CBOs are well known in the art. Details of its synthesis and physical properties can be found in, for example, WO 2006/101966, WO 2006/102016, WO 2006/102150, WO 2009/029476 and US 7,524,911, the disclosures of which are specifically incorporated into the present document by reference. As is known in the art, the density of OBC is directly related to its crystallinity, that is, the higher the density, the greater the percentage crystallinity. OBCs useful in the current hotmelt adhesive composition have densities ranging from 0.860 g / cm ³ to 0.900 g / cm ³ and a melting index of 1 g / 10 minutes at 1000 g / 10 minutes, preferably 1 g / 10 minutes at 100 g / 10 minute, as measured according to ASTM D1238 at 190 ° C with a weight of 2.16 kg.
Mixtures of two or more OBC polymers can also be used. For example, a mixture of a first OBC polymer and a second OBC polymer that is different from the first OBC polymer can be employed.
In addition to OBC, the hotmelt adhesive composition also comprises approximately 1% to approximately 40%, preferably approximately 2% to approximately 35% and more preferably approximately 2% to approximately 30% by weight of a secondary polymer having relatively low crystallinity, the low crystallinity is equal to or less than 250 joules / gram, preferably equal to or less than 150 joules / gram, and more preferably equal to or less than 100 joules / gram (J / g). In some embodiments, crystallinity is equal to or less than approximately 80 J / g, and in other embodiments equal to or less than approximately 50 J / g, and still in other embodiments equal to or less than approximately 25 J / g g. Thus, the secondary polymer comprises the amorphous polyalpha-olefins (APAO) and the crystalline or semi-crystalline polymers discussed previously in the present. The secondary polymer is a polymer that is
16/38 different from the OBC, the first and second tachyting resins, and the reinforcement resin. For example, the secondary polymer can function to maintain a relatively low viscosity for the composition without significantly affecting the bonding strength of substrates such as polyethylene.
As used herein, the term "secondary polymer" refers to thermoplastic materials composed of a homopolymer, a copolymer, a terpolymer and / or mixtures of homopolymers, copolymers, or terpolymers. Either a single secondary polymer can be used, or mixtures of two or more secondary polymers can be incorporated into the adhesive composition, depending on the desired formulation, as long as the crystallinity is below 250 J / g.
Any of a variety of well-known and readily available thermoplastic materials can also be used as the secondary polymer in adhesive compositions.
Examples of such materials include ethylene based polymers, including ethylene vinyl acetate, ethylene acrylate, ethylene methacrylate, ethylene methyl acrylate, ethylene methyl methacrylate, ethylene styrene interpolymer (ESI), ethyl acid ethylene, ethylene carbon monoxide vinyl acetate, and ethylene carbon monoxide N-butyl acrylate; polybutene-1 polymers or copolymers; polyolefins such as high and low density polyethylene; mixtures of chemically modified polyethylene and polyethylene, ethylene copolymers and mono- or di-unsaturated CiCe monomers; polyamides; polybutadiene rubber; polyesters such as polyethylene terephthalate, and polybutylene terephthalate; thermoplastic polycarbonates; amorphous polyalphaolefins (APAO); atactic polyalphaolefins, including atactic polypropylene, polyvinylmethyl ether and others; thermoplastic polyacrylamides, such as polyacrylonitrile, and acrylonitrile copolymers and other monomers such as styrene butadiene; polymethyl pentene; polyphenylene sulfide; aromatic polyurethanes; polyvinyl alcohols and copolymers thereof; polyvinyl acetate and random copolymers thereof; styrene-acrylonitrile, acrylonitrile-butadiene-styrene, styrene-butadiene rubbers, acrylonitrile butadiene-styrene elastomers, block copolymers AB, ABA, A- (BA) _n -B, (AB) _n -Y where block A comprises one aromatic polyvinyl block like polystyrene, block B comprises a medium rubber block that can be polyisoprene or polybutadiene, and optionally hydrogenated, Y comprises a multivalent compound, and n is an integer of at least 3, and mixtures of such substances. Examples of the latter block copolymers including
17/38 styrene-butadiene, styrene-butadiene-styrene, styrene-isoprene-styrene, ο styrene-ethylene-butylene-styrene, styrene-ethylene-propylene-styrene and styrene-ethylene-ethylene-propylene-styrene.
Block copolymers are available from Kraton Polímeros, Enichem, Fina and Dexco. Multi-block or tapered copolymers (type A- (BA) _n -B) are available from Firestone.
Other secondary polymers that could be used are syndiotactic polypropylene (SPP) polymers and / or mixtures of the SPP with amorphous atactic poly-a-olefins (APAO), which are well known in the art. SPP polymers are essentially stereospecific homopolymers of propylene or high molecular weight propylene copolymers with other α-olefin monomers such as ethylene, butene-1 or hexene-1. APAO polymers are a family of essentially amorphous low molecular weight homopolymers or copolymers of propylene or ethylene with an alphaolefin comonomer.
The thermoplastic polymer material comprising the secondary polymer may be composed of a thermoplastic material or mixtures of the thermoplastic materials which are preferably selected from groups consisting of polyolefins, modified acrylic polyolefins, modified vinyl acetate polyolefins, and acrylic polymers. The polyolefin can be polypropylene or polyethylene. The modified acrylic polyolefin can be a copolymer of polypropylene or polyethylene and an acrylic. Likewise, modified vinyl acetate polyolefin can be a copolymer of polypropylene or polyethylene and vinyl acetate.
The thermoplastic polymer material comprising the secondary polymer is preferably a suitable single-site copolymer or based on metallocene-catalyzed ethylene comprising the main portion by weight of ethylene and a smaller portion by weight of a C3 to C-is alpha-olefin comonomer, either a single-site or ethylene-based metallocene-catalyzed copolymer comprising the largest portion by weight of propylene and the smallest portion by weight of C2 to Ο _Ί8 alpha-olefin comonomer, or a mixture of ethylene-based copolymers, the copolymers based on in propylene, or one or more of the ethylene-based copolymers with one or more of the propylene-based copolymers. The alpha-olefin comonomer preferably contains 3 to 12 carbon atoms, more preferably contains 4 to 10 carbon atoms, and more preferably contains 4 to 8 carbon atoms. More particularly, 0
18/38 alpha-olefin comonomer can be selected from 1-butene, 1-pentene, 3 methyl-1-butene, 3-methyl-1-pentene, 1-hexene, 4-methyl-1-pentene, 1-dodecene, 3 methyl-1-hexene, 1-octene, and 1-decene. Particularly preferred is 1-butene or 1-octene copolymerized with ethylene.
The content of the alpha-olefin comonomer in the ethylene-based copolymer is at least 20% by weight and in the range of 20% to 50% by weight, preferably 25% to 50% by weight, more preferably 30% to 50% by weight . Suitable ethylene-based copolymers have a density as determined by ASTM D-792 of 0.90g / cm ³ or less and in the range of 0.90g / cm ³ to 0.85g / cm ³ , preferably between 0.89g / cm ³ and 0.85g / cm ³ , and more preferably between 0.885g / cm ³ and 0.85g / cm ³ . Suitable ethylene-based copolymers also have a melting index at 190 ° C and 2.16 kg as determined by ASTM D1238 of greater than 10 g / 10 minutes, preferably more than 50 g / 10 minutes, and more preferably more than 100 g / 10 minute.
The index of the alpha-olefin comonomer in the propylene-based copolymer is at least 5%, preferably 5% to 30%, and more preferably 5% to 15% by weight, and the preferred copolymer is a propylene-ethylene copolymer. Propylene-based copolymers have a melt index (measured at 230 ° C) of more than 10 g / 10 minutes, preferably more than 50 g / 10 minutes, and more preferably more than 100 g / 10 minutes.
Mixtures can comprise two or more ethylene-based copolymers or two or more propylene-based copolymers, or one or more ethylene-based copolymers with one or more propylene-based copolymers. Where a mixture of copolymers is used, the calculated density of the mixture must also be within the above limits, ie less than 0.900 g / cm ³ , but more than 0.850 g / cm ³ . For example, a mixture of 70% of an ethylene-based copolymer that has a density of 0.870 g / cm ³ and 30% of a propylene-based copolymer that has a density of 0.885 g / cm ^{3 will} result in a final blend that has a density calculated from 0.875 g / cm ³ .
Useful metallocene-catalyzed single-site polymers are available from, among others, Dow Chemical Company and Exxon Mobil Chemical Company which are producers of single-site or restricted geometry catalyzed polyethylene. These resins are commercially available as polyethylenes AFFINITY ™ and EXACT ™
Propylene-based or metallocene-catalyzed single-site copolymers are available under the brand name VERSIFY ™ from Dow Chemical Company. THE
19/38 manufacturing of such polypropylenes is also based on the use of a metallocene or a single site catalyst system and based on Dow's INSITE ™ technology.
The secondary polymer works to modify specific polymer functions to modify specific physical properties and / or characteristics of the OBC-based adhesive composition, as desired. For example, the addition of one or more secondary polymers could be used to increase or decrease (i) the elasticity of the adhesive composition; (ii) the adhesion of the adhesive composition; (iii) the low temperature resistance of the adhesive composition; (iv) the high temperature resistance of the adhesive composition; (v) the creep resistance of the adhesive composition; (vi) the cohesive strength of the adhesive composition; (vii) the pressure sensitivity characteristics of the adhesive composition, (viii) the viscosity characteristics of the adhesive composition and / or (ix) the aging characteristics of the adhesive composition. The relative change (increase or decrease) of the above characteristics is measured relative to the adhesive composition without the addition of the secondary polymer. Thus, for example, Kraton G1652 or Kraton G1657, both are styrene / butylene / styrene block copolymers (SEBS), can be added to provide increased elongation characteristics to the OBC polymer in order to increase the elasticity of the adhesive composition. The increased elasticity results in better characteristics of the sprayability of the adhesive composition. In another example, Eastoflex 1003 or Eastoflex 1060, both ethylene-based APAO, can be added to provide enhanced adhesion characteristics for the composition, if desired.
The current invention may also include approximately 0% to approximately 20%, preferably approximately 2% to approximately 15%, more preferably approximately 4% to approximately 12%, and more preferably approximately 6% to approximately 10%, by weight of an aromatic resin. reinforcement that has a softening point equal to or greater than 115 ° C. Examples of such reinforcing resins can be prepared from all substantially aromatic monomers that have a polymerizable unsaturated group. Typical examples of such aromatic monomers include styrenic monomers, styrene, alfamethyl styrene, vinyl toluene, methoxy styrene, tertiary butyl styrene, chloro-styrene, coumarone, indene monomers including indene, and methyl indene. The softening points of the aromatic reinforcing resin ring and sphere are
20/38 preferably between 115 ° C and 160 ° C. More preferably, the softening point is between approximately 115 ° C and 140 ° C and more preferably between approximately 120 ° C and 140 ° C. Preferred examples are Plastolyn 240, Plastolyn 290 and Plastolyn R1140 available from Eastman Chemical. They have softening points of the ring and ball of 120 ° C or 140 ° C.
As used at present, the term "elasticity" means the ability of a material to partially or completely recover its original shape after the deformation force has been removed.
As used herein, the term "adhesion" means the state in which two surfaces are held together by interfacial forces, which can be a combination of valence forces or interlocking action, or both.
As used herein, the term "low temperature resistance" means the relative ability of an adhesive to retain its bond strength and structural integrity at relatively low temperatures (that is, below room temperature).
As used herein, the term "high temperature resistance" means the relative ability of an adhesive to retain its bond strength and structural integrity at elevated temperatures (for example, temperature or body storage conditions).
As used at present, the term "creep resistance" means the ability of an adhesive to hold the elastic filaments stretched in place without significant slippage.
As used at present, the term "cohesive force" means the degree of internal strength of a material to resist deformation. There are several ways to determine cohesive strength, such as a tensile test method using an Instron type tensile tester.
As used herein, the term "pressure sensitivity" means the ability of an adhesive to form a bond with a substrate using pressure alone.
Although OBC is the primary component of the polymer, the adhesive composition can also optionally contain mixtures of OBC with approximately 1% to approximately 15% by weight of another auxiliary polymer. Examples of the latter auxiliary polymers that can be used with OBC in hot melt adhesive compositions include, but are not limited to, styrenic block copolymers (SBC) and include styrene-butadiene (SB), styrene-isoprene (SI), styrene-isoprene -butadiene-styrene (SIBS),
21/38 styrene-ethylene-butylene-styrene (SEBS), styrene-ethylene-butylene (SEB), styrene-ethylene propylene-styrene (SEPS), styrene-isoprene-styrene (SIS), styrene-butadiene-styrene (SBS) , styrene-butadiene-butadiene-styrene (SBBS), ethylene-vinyl-acetate (EVA), styrene-ethylene-ethylene-propylene-styrene (SEEPS) and styrene-ethylene propylene (SEP). Such polymers are available for example from Kraton Polímeros, Polimeri Europa, Total Petrochemicals, Dexco, and Kuraray. Multi-block or tapered copolymers (type A- (BA) _n -B) are available from Firestone. In addition, the auxiliary fraction of the polymer of the hot melt adhesive may contain other polymers such as copolymers of ethylene, propene or other olefinic monomers, or as the copolymerization of acrylic monomers. These additional polymers can be homopolymers, or copolymers and can potentially be modified by any modification during- or post-polymerization such as grafting or chain separation. Mixtures of various auxiliary polymers can also be employed as long as the composition retains viscosity, latency resistance and the desired characteristics of the low temperature application of the current invention.
Adhesive thermofusible formulas according to the present invention also contain approximately 0% to approximately 60%, preferably approximately 2% to approximately 30%, and more preferably approximately 3% to approximately 20%, by weight, of the entire plasticizer. A suitable plasticizer can be selected from the group that includes not only the usual plasticizing oils, such as mineral oil, but also olefin oligomers and low molecular weight polymers, glycol benzoates, as well as vegetable and animal oil and derivatives thereof. oils. Petroleum-derived oils that can be used are generally relatively high boiling temperature materials that contain only a minor proportion of aromatic hydrocarbons. In this regard, aromatic hydrocarbons should preferably be less than 30%, and more particularly less than 15%, by weight, of the oil. Alternatively, the oil may be totally non-aromatic. Oligomers can be polypropylenes, polybutenes, hydrogenated polyisoprene, hydrogenated butadiene or the like having an average molecular weight between approximately 100 and approximately 10,000 g / mol. Suitable vegetable and animal oils include glycerol esters of fatty acids and the usual polymerization products thereof. Other plasticizers can be used as long as they have the appropriate compatibility. Nyflex 222B, a naphthenic mineral oil from Nynas Corporation, was also discovered to be
22/38 a suitable plasticizer. As will be appreciated, plasticizers have typically been employed to decrease the viscosity of the total adhesive composition without substantially decreasing the adhesive strength and / or the service temperature of the adhesive. The choice of plasticizer can be useful in the formulation for specific end uses (such as moisture resistant core applications). Because of the savings involved in production and material cost, as plasticizers generally have a lower cost than other materials involved in the formulation such as polymers and tachyting resins, the amount of plasticizer in the adhesive should be maximized for cost considerations.
Waxes in amounts from 0% to 20% by weight can also be used in the adhesive composition, and are used to reduce the melting viscosity of the hot melt adhesives without significantly decreasing their adhesive characteristics. These waxes are also used to reduce the opening time of the composition without affecting the temperature performance.
The wax as the material component of the adhesive is optional but when included can comprise up to approximately 20% by weight of the adhesive composition.
Among the useful wax materials are:
(1) Low molecular weight, ie 100-6000 g / mol, polyethylene which has a hardness value, as determined by the ASTM D-1321 method, from approximately 0.1 to 120 and ASTM softening points of approximately 66 ° C to 120 ° C;
(2) petroleum waxes such as paraffin wax that have a melting point of approximately 130 ° to 170 ° F and microcrystalline wax that has a melting point of approximately 135 ° to 200 ° F, the last points of melting which are being determined by the ASTM D 127-60 method;
(3) atactic polypropylene that has a ring and ball softening point of approximately 120 ° to 160 ° C;
(4) metallocene-catalyzed propylene-based wax like those sold by Clariant under the name Licocene.
(5) metallocene-catalyzed wax or single-site catalyzed wax, such as those described in US Patent No. 4,914,253, 6,319,979 or WO 97/33921 or WO 98/03603.
(6) synthetic waxes made by the polymerization of carbon monoxide and hydrogen such as Fischer-Tropsch wax; and (7) polyolefin waxes. As used at present, the term “wax
23/38 polyolefin ”refers to polymeric or long-chain entities that comprise olefinic units of the monomer. These materials are commercially available from Westlake Chemical Co. under the trade name “Epolene”. The materials that are preferred for use in the compositions of the present invention have a ring and ball softening point of 200 ° F to 350 ° F. As should be understood, each of these waxes is solid at room temperature. Other useful substances include hydrogenated animal, fish and vegetable fats and oils such as hydrogenated lard, lard, soybean oil, cottonseed oil, castor oil, menhaden oil, cod liver oil, etc., and they are solid at room temperature because they are hydrogenated hydrogenated, they have also been found to be useful with regard to functioning as a material equivalent to wax. These hydrogenated materials are generally referred to in the adhesive industry as animal or vegetable waxes.
The adhesive also typically includes about 0.1% to about 5% of a stabilizer or antioxidant. The stabilizers that are useful in the thermosetting adhesive compositions of the present invention are incorporated to help protect the polymers mentioned above, and thus the complete adhesive system, from the effects of thermal and oxidative degradation that normally occurs during the manufacture and application of the adhesive as well as in the common exposure of the final product to the environment. Such degradation is usually manifested by a deterioration in the appearance, physical properties and performance characteristics of the adhesive. A particularly preferred antioxidant is Irganox 1010, a tetracis (methylene (3,5-di-teri-butyl-4-hydroxyhydrocynnamate)) methane manufactured by Ciba-Geigy. Among the applicable stabilizers are high molecular weight hindered phenols and multifunctional phenols, such as sulfur and phosphorus-containing phenols. Impeded phenols are well known to those skilled in the art and can be characterized as phenolic compounds that also contain sterically bulky radicals close to the phenolic hydroxyl group of the same. In particular, tertiary butyl groups are generally substituted on a benzene ring in at least one of the ortho positions relative to the phenolic hydroxyl group. The presence of these bulky substituted radicals in the vicinity of the hydroxyl group serves to delay its stretching frequency and correspondingly its reactivity; this steric impediment thus provides the phenolic compound with its stabilizing properties. Representative hindered phenols include:
24/38, 3,5-trimemyl-2,4,6-tris (3-5-di-tert-butyl-4-hydroxybenzyl) benzene; pentaerythritol tetracis-3 (3,5-di-tert-butyl-4-hydroxyphenyl) propionate; n-octadecyl-3 (3,5-ditherc-butyl-4-hydroxyphenyl) propionate;
4,4'-methylenebis (4-methyl-6-tert-butylphenol);
4,4'-thiobis (6-tert-butyl-o-cresol);
2.6-di-tert-butylphenol;
6- (4-hydroxyphenoxy) -2,4-bis (n-octyl) -1,3,5-triazine;
2.4.6- tris (4-hydroxy-3,5-di-tert-butyl-phenoxy) -1,3,5-triazine; di-n-octadecyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate;
2- (n-octylthio) ethyl-3,5-di-tert-butyl-4-hydroxybenzoate; and sorbitol hexa- (3,3,5-di-tert-butyl-4-hydroxy-phenyl) propionate.
The performance of these stabilizers can be further enhanced by using in conjunction with them: (1) synergists such as, for example, thiodipropionate esters and phosphites; and (2) metal chelating and deactivating agents such as, for example, ethylenediaminetetraacetic acid, salts thereof and disalicylalpropylenediimine.
The adhesive composition useful in the method of the present invention can be produced using any of the methods known in the art. A representative example of the procedure involves placing all substances in a coated mixing boil, and preferably in a coated heavy-load mixer of the Baker-Perkins or Day type, which is equipped with rotors and thus raising the temperature of the mixture in the range of 120 ° C to 177 ° C. it must be understood that the exact temperature to be used in this step will depend on the melting point of the particular ingredients. The resulting adhesive composition is stirred until the polymers are completely dissolved. A vacuum is then applied to remove any trapped air.
Up to 25% of optional additives can be incorporated into the adhesive composition to modify particular physical properties. These additives may include dyes, such as titanium dioxide and fillers such as talc, calcium carbonate, and clay, cross-linking agents, nucleating agents, reaction compounds, organic or mineral fire retardants, as well as absorption of ultraviolet (UV) light and UV fluorescence agents. These optional additives are well known in the art.
In certain embodiments, the adhesive formula may contain a reinforcing resin entirely aromatic or substantially entirely aromatic. The aromatic or substantially entirely aromatic resin must have the
25/38 softening equal to or greater than 115 ° C. Examples of such reinforcement resins can be prepared from any substantially aromatic monomer that has a polymerizable unsaturated group. Typical examples of such aromatic monomers include styrenic monomers, styrene, alfamethyl styrene, vinyl toluene, methoxy styrene, tertiary butyl styrene, chloro-styrene, coumarone, indene monomers including indene, and methyl indene. The ring and ball softening points of the final block aromatic resin are preferably between 115 ° C and 160 ° C. More preferably, the softening point is between approximately 115 ° C and 140 ° C and most preferably between approximately 120 ° C and 140 ° C. Two preferred examples are Plastolyn 240, Plastolyn 290 available from Eastman Chemical. They have ring and ball softening points of 120 ° C and 140 ° C, respectively. Preferably, styrene and / or alpha-methyl-styrene and / or vinyl-toluene monomers are used. They can also be substantially entirely aromatic hydrogenated hydrocarbon resins such as Plastolyn R1 140 which has a ring and ball softening point of 140 ° C. The reinforcing resin should be present in the amounts of approximately 0% to approximately 20% in the adhesive composition and if present, preferably between approximately 2% to approximately 15%, more preferably approximately 4% to approximately 12%, and more preferably approximately 6% approximately 10%.
Various methods are conventionally used to coat a hot melt adhesive in reasonably low viscosity on a substrate. This can be done by the roller coating or by any type of printing method, or by the coating of the notch, by extrusion or by spray gun. The spray gun techniques are numerous and can be done with or without the aid of compressed air that would form the adhesive spray, and consequently the pattern of the adhesive. The hotmelt adhesive material is usually left to melt in the tanks, and then it is pumped through the hoses to the final coating point on the substrates.
For the current invention, the preferred methods of applying the adhesive would be by applying the spray, more preferably with the aid of hot air. Among these techniques, the most common are spiral sprayer (Controlled Fiberization ™ by Nordson), Summit ™ by Nordson, Surewrap ™ by Nordson, Omega ™ by ITW, Curtain Coating ™ by Nordson and various melt blown processes. For the current invention, the temperature at which the
26/38 hotmelt adhesive is applied must be below 170 ° C, so that heat sensitive substrates are not damaged. Preferably, this temperature should be equal to or below 160 ° C, more preferably below 150 ° C.
The viscosity (as measured by ASTM D3236-88) of the adhesive material must generally be equal to or below 20,000 mPa.s, more preferably less than 15,000 mPa.s, more preferably less than 12,000 mPa.s at 163 ° C (325 ° F) in order to achieve the desired spray pattern and consequently the desired bonding performance (note: 1 mPa.s equal to 1 centipoise). Line speed, addition levels as well as opening time, adjustment time, compression forces and compression time are also parameters of process control.
Considering the example of elastic bonding filaments in the environment of a diaper manufacturing process, the typical circumstances are very strict with respect to the adhesive characteristics. The adhesive is typically sprayed onto a polymeric film (generally based on ethylene or propylene under 40 gsm of the base weight), or on the elastic filaments stretched to approximately 500% of their initial relaxed state, and preferably approximately 300% elongation. The film and elastic filaments are joined by contact, before, during or after spraying adhesive. The film together with the stretched elastic filaments is then laminated to a low base weight non-woven fabric (below 50 gsm). In fact, the main substrate can also be a nonwoven web and can be the same nonwoven web as the secondary substrate, when this web is simply sprayed with the adhesive and then folded over the elastic filaments. Plastic films can have various characteristics such as breathability, color, printing, stretching, embossing, or surface treatments, for example, favoring adhesion of adhesives or inks. The elastic filaments can be made of natural or synthetic rubber, especially of polyurethane formulation, and can be in the form of a strip, or in the form of multifilament. More specifically, elastic diaper filaments are generally made of polyester polyurethane microfilaments joined together to obtain the correct elastomeric strength, such as Lycra ™ or Lycra XA ™ from Invista, or narrow bands made of narrow bands of natural or synthetic rubber like Fulflex ™, from Fulflex Elastomerics.
Line speeds can be as high as 700 feet per minute
27/38 or higher, and open times are typically less than approximately 0.5 seconds. Adjustment time is considered to be immediate or negligible, as compression on nip rollers is generally helping to adjust the adhesive material. The levels of addition vary according to the application and the required level of bond strength. The viscosity of the adhesives of the current invention is equal to or less than 20,000 mPa.s at 163 ° C (325 ° F). Preferably, it should be less than 15,000 mPa.s, more preferably below 12,000 mPa.s, as determined using a Brookfield Thermocel or other appropriate viscometer and using the testing techniques that are determined in the ASTM D3236-88 method.
The current invention therefore comprises any process of conventional elastic attachment technology as known in the prior art. The current invention also encompasses any application where the various materials of the carcass are involved as non-woven materials, polymeric films, and in the general elastomeric components placed in articles such as diapers, in the form of filaments, films, non-woven or any other continuous or segmented form . All substrate material and any form of substrate can be used in any possible combination, the adhesive allowing to join two or more substrates. The substrates can be of multiple shapes, for example, fibers, film, yarn, strip, tape, coating, sheet, strip. The substrate material can be a polyolefin, a polyacrylic, a polyester, a polyvinyl chloride, a polystyrene, or a cellulosic such as wood, cardboard and paper. The mechanical behavior of the substrate can be rigid, plastic or elastomeric. Among the elastomeric materials there are several examples such as natural or synthetic rubber, copolymers based on polyurethane, polyether or polyester urethanes, styrene or starch block copolymers, or olefinic copolymers. The above list is not limiting, it is only intended to describe examples of what the current invention can cover.
The current invention encompasses any application in which laminates, composites and disposable products are made with the help of the bonding pieces together with a hotmelt adhesive used at a temperature below 170 ° C, preferably equal to or less than 160 ° C, while obtaining the proper cohesion of the adhesive bond to withstand mechanical stress at low, ambient or high temperature, particularly under creep conditions. Diapers, adult incontinence products, sanitary wipes and other disposable absorbent products are intended applications for the composition
28/38 adhesive of the invention, as well as bed pads, absorbent pads, surgical drapes and other related medical or surgical devices. Construction applications, structural applications or packaging applications, in particular the packaging of disposable articles and food packaging can also be applications where the invention is useful. Specifically for the elastic accessory, the current invention allows the bonding of the elastic filaments on film substrates by applying the adhesive at a temperature below 170 ° C, preferably equal to or below 160 ° C. The strength of the bond is first measured by testing the bond under a specific creep configuration, giving a model of the constraints found in a real life cycle of a disposable diaper, where the baby's movements stretch laminates at room temperature or body temperature. . Creep testing methods may vary between industry, and the applicant has developed over the years its own test method that satisfies most applications seen in the field, and, most importantly, that can compare and differentiate adhesives from each other, determining whether an adhesive is suitable or not for an efficient elastic function of the accessory, since this adhesive has been coated to form a laminated structure. The creep test can be performed within the first few days after the coating operation and can be performed after a few days or a few weeks at elevated temperature, to simulate the effects of aging under conditions of storage and transport.
Good performance for the elastic accessory in a diaper application is typically achieved when the bond retention is both more than 60%, preferably more than 70%, more preferably more than 75%, most preferably more than 80% when testing creep is carried out within 2 days after the adhesive has been applied to the substrates (initial creep test). These conditions are indicative of the level of retention of adhesion and bonding under the conditions of fluency that can be achieved. These circumstances depend on the adhesive application technique used, such as the spiral sprayer or Surewrap® for example; the level of adhesive addition; process parameters such as air pressure, speed line, and adhesive temperature. Because of the savings involved in production and material cost, the preferred adhesive additions for a spiral sprayer application are lower than 18 gsm, more preferably equal to or below 15 gsm, and most preferably equal to or below 12 gsm. gsm. If coating techniques
29/38 individual filaments are used, the level of addition is generally less than 60mg / filament / meter. For construction applications, the level of addition is typically 6 grams / square meter or less. For other applications, the levels of addition will vary depending on the specific requirements of the end use.
Examples
The hot melt adhesive was prepared with the ingredients and mixing procedures described below in this document. A total of 2000 grams each was made and mixing was performed at approximately 150 ° C to 190 ° C under the atmosphere of carbon dioxide in a type of laboratory mixer that consisted of a motor-driven propeller, a heating mantle , a temperature control unit and a container of approximately 1 gallon in size. The appropriate amounts of each component, calculated according to the ratios shown in the tables below, were added to the container in an appropriate sequence to allow mixing while limiting heat degradation or shearing of the ingredients. After the ingredients in the container were completely melted and thoroughly mixed to allow for good visual homogeneity, the samples were stored appropriately for testing.
Laminated specimens were formed using a high speed lab coater at 800 feet per minute. When a spiral spray technique was used, the coated was fitted with a 0.018 inch to 0.020 inch diameter extrusion spiral spray nozzle with 12 air holes available from Nordson Corporation. When the Surewrap® technique was used, the coating was equipped with a 0.018 inch diameter three-filament extrusion nozzle available from Nordson Corporation. The adhesives were sprayed on various coating weights, depending on the required application, with different opening times - typically 0.05 to 0.1 seconds - for those of 1bar-nip compression rollers.
The standard nonwoven weave based on spinning polypropylene is available from BBA Corporation at 15.7 grams per square meter coating weight. Standard white non-breathable polyethylene film treated and etched at 17 grams per square meter is available under the trade name DH-216 from Clopay Corporation. Standard spandex filaments are available from Invista, under the trademark Lycra XA, and the grade used is 262P, at 800 decitex.
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When the spiral sprayer is used, the sprayer head is usually perpendicular to the substrate and at a height between 0.5 and 1 inches to begin a pattern of 12 to 14 mm wide in the laminated structure, covering 3 parallel filaments of Lycra material with the 5 millimeters between them.
The creep resistance or bond retention test is performed with laminated specimens that contain the elastic filaments. The specimen, cut to approximately 350 millimeters in length, is fully stretched and its ends have been firmly joined in a rigid plate part. A length of 300 mm has been marked in the machine direction and the elastic filaments are cut at the marks. The specimen is then placed in an air circulating oven at 38 ° C. Under these circumstances, the stretched elastic filaments may retract or contract a certain distance. The distance between the ends of each elastic filament is measured after four hours. The ratio of the final length to the initial length, defined as the bond retention and expressed as a percentage (%), is a measure of the adhesive's ability to hold the elastic filaments. This ratio is measured from 8 to 12 elastic filaments and then the result is averaged. If this test is performed within 2 days after the adhesive coating has been done, it is called an initial creep test. If performed after the specimen was placed in an oven at 38 ° C or another week after the coating operation, this test is called the week-old fluency test.
The procedure for performing the fluency test is as follows:
Basics: The elastic in a given stretch (250% or 300% stretched) is sandwiched between two (2) substrates (primary and secondary substrates) that use an adhesive to form a laminate.
Purpose: This test is to measure the movement of the elastic or creep of the primary and secondary substrates.
Procedure:
A. Using the stapler, secure one end of the laminate to the corrugated board. Stretch the laminate to its full length, making sure not to fray the lamination. Then, secure the other end of the laminate.
B. Using the ruler, mark the length approximately 300 mm through the elastic.
C. Once all samples are fixed and marked, cut with a blade through each of the elastic's filaments.
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D. Place the test samples in the oven, usually set at 38 ° C, and test them. The samples must be checked after 4 hours. Mark the ends of each elastic filament and measure the% creep retention or% creep.
E. Laminate samples are aged at elevated temperature (> 38 ° C) for 1 week (or more) to determine the% creep retention over time. Laminates are conditioned overnight at room temperature and before testing.
Example calculations:
Initial laminate = 300 mm
Laminate after 4 hours = 250 mm% creep retention = lamination length after x hours x 100%
Initial lamination length% creep retention = 250 mm x 100%
300 mm% creep retention = 83.0%
Storage module (G '), Tg and Txover were determined using a TA Instruments Ares rheometer. The parallel plates used had a diameter of 25 mm and an opening of 1.6 mm. The instrument was adjusted to a frequency of 10 rads / second and the temperature scan was performed from 140 ° C to -40 ° C.
Stripping forces were determined at 180 ° on an Instron tensile testing machine at a tensile speed of 12 inches / minute at room temperature (ie, about 72 ° F).
The raw materials used in the various compositions shown in the examples and described in the current specification are defined as follows:
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Raw material name TypePhysical properties and test methods Mineral oils Mineral oils Viscosity '@ 40 ° C Nynas222B White hydrogenated naphthenic process oil Nvnas 90-ll0eP ASTMD445 Kavdol White mineral oils Sounebom. Inc. 64.5 - 69.7 cP ASTMD445 Viscosity (SUS) & 100- C Specific gravityhdopolHlOO polybutene outbreaks 1025 cP ASTM 31218 0.893 D1298 Resins Provider Ring softening point EastotacHIOOR Partially aliphatic hydrocarbon resin Eastman 100 ° C ASTME28 Piccotâc9095 Aromatic C5 hydrocarbon resin Eastman 95 ° C ASTME28 Easftrtac H11.5Í Aliphatic hydrocarbon hydrocarbon resin Eastman 115 ^C C ASTME28 EscorezS400 Hydrogenated DCPD ExxonMobil KXFC ASTME28 Esc $ rez $ 340 Hydrogenated DCPD ExxonMobil 140 ^ AST.ME28 SulcorezSU2IO Fully hydrogenated aliphatic hydrocarbon resins Ko Ion Chemical Co. Ltd 1Ι0Ό ASTME28 Plüstolyn 290 Pure monomer resins - alpha methyl styrene Eastman 104 ° C ASTME28 Primary polymer Provider Density melting index Bostik fusion enthalpy data Infuse 9817 OBC (° ^{leflna in} Copolymer Block) Dow 0.877 g / cm ¹ ASTMD792 15.0 g / 10mfo (190 ° C / 2.16 .............., Ks) ASTM D1238 42.6 Infuse 98 07 OBC <O ' ^e fi ^{in the} Copolymer Block) Dow 0.866g / cm ¹ ASTMD792 15.0 g / 1 Omiti (190 ^ 0 / 2.16Kg) ASTM D1238 23.0 Infbse9507 OBC Copolymer Block) Dow 0.866 g / cm ¹ ASTMD792 5.0g / 10min (190ΌΛ.Ι6Kg) ASTM D1238 Secondary polymer Provider Density melting index Bostik fusion enthalpy data (J / g Affinity GA 1900 Ethylene-octene copolymer Dow 0.870 g / cm ³ ASTMD792 1,000 g / lftnm (19O “C / 2.16 Kg) ASTMD1238 69.3 Vistamaxx 6202 CopolymerEthylene-propylene (15% Cj) ExxonMobil 0.861 g / cm ¹ ASTMD1505 i8g / 10mm(230 * 0 / 2.16.......... JsJ ASTM D1239 153
V5tamaxx2320 Copolymer Ethylene * / 140 / f * propylene I ¹ ''!) ExxonMobil 0.864 g / cm ’ ASTMD1505 200 g / l Omm (23 ° C / 2.16)kg)10.4 Licocene P13l) 2 Metallocene-propylene wax Clariant 0.870 gfan ^! ISO 1183 39.0 EpcleneC-10 Highly branched polyethylene Eastman 10FC ASTME28 91.3 BaracoPXI05 Fischer TiopsdifFT), Syndetic Wax Baker PetalitePolymers 105 ° C ASTME28 225.6 EscoreneMV2514 Ethylene vinyl acetate (VA) ExxonMobil O. $ 25g / cm ³ 77.6 EOM2-15 Metallocene-propylene copolymer Total Petrochemical 12.0g / 10min(23 ° CMKg) ASTMD1238 75.7 Provider Brookfield, Viscosity at I9ÍPC Ring and ball softening point Bostik fusion enthalpy data (J / g) EasiFlexElOóO Propylene-based amorphous polyolefin polymer (APO's) Eastman 6000cP ASTMD3236 135 ° C ASTME28 11.6 EastoílexE1200 Propylene-based amorphous polyolefin polymer (APO's) Eastman 20000 cP ASTMD3236 135 ° C AS1ME28 16.3 VestoptalW Amorphous polyolefin polymer (rich in propene) EvonikDegussaCorporation 3500 cP ASTMD3236 105Ϊ ASTME2Í 17.6 Provider Styrene Septal W Poly (styrene-b-isoprene / b-butadiene-b-styrene), hydrogenated Septon Co, of America 30 _t 0% Styrene Antioxidant Provider Ignition point Variation of ^{, us} ° .fO irganoxlOIO Impeded phenol Ciba Specialty 297 110-125
33/38
APAO as used herein is an abbreviation for amorphous polyalphaolefin. HC as used at present is an abbreviation for “hydrocarbon”. OBC as used herein is an abbreviation for the "olefin block copolymer".
SB as used in the present is an abbreviation for styrene-butadiene SI as used in the present is an abbreviation for "styrene-isoprene".
SIBS as used herein is an abbreviation for styrene-isoprenobutadiene-styrene
SEBS as used herein is an abbreviation for styrene-ethylene10 butadiene-styrene
SI as used at present is an abbreviation for styrene-isoprene ”.
SIBS as used herein is an abbreviation for styrene-isoprenobutadiene-styrene ”.
SEBS as used herein is an abbreviation for styrene-ethylene15 butadiene-styrene ”.
SEB as used herein is an abbreviation for styrene-ethylene-butylene ”.
SEP as used herein is an abbreviation for styrene-ethylenepropylene ”.
SEEPS as used herein is an abbreviation for styreneethylene-ethylene-propylene-styrene ”.
EVA as used at present is an abbreviation for ethylene vinylacetate ”.
SIS as used at present is an abbreviation for styrene-isoprene25 styrene ”.
SBS as used herein is an abbreviation for styrene-butadiene-styrene ”.
SEPS as used herein is an abbreviation for styrene-ethylenepropylene-styrene ”.
SBBS as used herein is an abbreviation for styrene-butadiene-butadiene-styrene ”.
SPP as used herein is an abbreviation for syndiotactic polypropylene.
The invention is further illustrated by means of specific examples which are set out below.
EXAMPLE 1
34/38
Table 1 illustrates four different compositions prepared according to the present invention using the lowest density grade OBC (Infuse ™ 9807) and compares these with the composition containing no secondary polymer (45-B) as well as with a commercially available hotmelt adhesive 5 based on SBS (H4237) available from Bostik Inc. for elastic attachment applications. Table 1 illustrates the results of initial creep resistance of the described compositions when the addition of adhesive is 12 grams / meter ² (gsm), in a spiral spray configuration. Table 1 shows that the formula 45-B has adequate creep resistance, while formulas 5010 G, 50-H, 50-1 and 50-K all have adequate creep resistance that are comparable with H4237. From these results it is clear that the formulas 50G, 50-H, 50-1 and 50-K are suitable to meet the requirements of the present invention as described.
TABLE 1
Raw material 1712-45B 1712-5M3 1712 « 1712-504 1712-SO-K H4237 Nynas222B 16 10 14 14 10Eastoflex 10606 6 Eastoflex 12008.5Ϊ1 9.5Eastotac HlOOR 63.5 60 59.5 59.5 60Infofô9807 20 10 15 10 15EOD-02-155 Septon4033 5 5 EpoleneC-10 5IrganoxlHello 0.5 0.5 0.5 0.5 0.5Total 100 100 100 100 100
Physical properties
Viscosity at 163 ° C _f CP 7162 12050 9375 6550 6950 7900 en, softening (Ugj’JJOgj Glicerina ®Ç) 106 114 109 109 108 92 Tg, ° C 32 27.7 23.5 25.4 33Txover, ° C 69 63 69.3 63.2 67.4G '@ 25 ° C (go ^to M 1.04 x 10 ^a 4.03x10% 3.28x10% 2.65x10% 1.49χ10 ^Λ 7 Percentage (%) of creep retention a; 38 ^ 0 initial 45 63 67 69 n 70
EXAMPLE 2
35/38
Table 2 illustrates six different compositions prepared according to using the high density OBC (Infuse ™ 9817) and compares these with a commercially available SBS-based hot melt adhesive (H4237) available from Bostik Inc. for elastic attachment applications. Table 2 also illustrates the initial creep test results for the compositions described in Table 2 when the addition of adhesive is 12 gsm, in a spiral configuration. Table 2 demonstrates that the formulas Al, AJ, AK, AM, 50-N and 50-0 all have adequate creep resistance and that they sound comparable to H4237. From these results, it is clear that the formulas Al, AJ, AK, AM, 50-N and 50-0 are suitable to fulfill the requirements that the present invention has described.
TABLE 2
Raw material 1712-AI 1712-AJ 1712-AK 1712-AM 1712-50-N 1712-50-0 H4237 Nynas222B 10 10 10 10 10 14Eastoflex 1060 14.5 14.5 12.5 12.5 14.5 Eastoflex 120011Score 5400 3060 30 Score 5340 30 3030 Piccotac 909530Eastotac H100R 60 59.5Infuse 9817 15 15 17 15 15 15BarecoPX105 2 Irganox 1010 0.5 0.5 0.5 0.5 0.5 0.5Total 100 100 100 100 100 100Physical propertiesViscosity at 163 ° C, cP 7525 8525 8300 6925 7850 6975 7900 F > t. softening (HcfZOg, 'Glycerin, ° C) 114 112 113 113 113 114 92 Tfe ° C 40.2 40.3 32 llHand available 35.6 32Txovcr, ° C 76.3 75.9 78.7 Not available 79.1 79.1<7. »25 ° C (dynes / _cm ² ) 3.61 x 10 ^Λ 7 3.45χ10 ^Λ 7 1.44χ10 ^Λ 7 Not available 2.43 x 10 ^Λ 7 1.71 x 10 ^Λ 7Percent (%) of creep retention at 38 ° Cinitial 62 71 66 62 62 70 70
EXAMPLE 3
Tables 3 and 3A illustrate several different compositions prepared according to, (except 50N-26, 50N-27 and 50N-28 which are state of the art compositions of WO 2006/102150 and 50N-9 which have no secondary polymer) containing different mixtures of polymers and compared with a commercially available SBS-based hot melt adhesive (H4237) available from Bostik Inc. for elastic attachment applications. Tables 3 and 3A also illustrate the initial creep retention% for the compositions described in Tables 3 and 3A, when the addition of adhesive is 12 gsm in a spiral configuration. From these results it is clear that the formulas (except for the three
36/38 prior art and 50N-9 compositions noted above) are suitable to meet the requirements that the present invention has described. In addition, examples 50N-9, 50N-11 and 50N-12 illustrate that as the amount of secondary polymer increases from 0% to 11% to 20%, 5 respectively, creep retention also increases.
TABLE 3. B
37/38
TABLE 3
Raw material 1712-5® 1712-M3 1712-50N-9 1712-50Χ-Π 1712Λ-12 1712-50N-I3 1712-50N-19 1712-50N-25 1712-5®-26 1712-50M7 1712-50 » B4237 Nyiías222B 1024.5 14 5 10 11) 10 Woí10 25 25 25E ^ lvuÜÍ 106Ô 14.5 14.511 20 14.514.5 £ ufHIOffi 50 60 6G 59.5 59.5 55 5555EastotacHllSL 50 Inta9817 15 15 15 15 15 15 15 15 20lnfa9507 20 Vestoplast704 14.5PlastoIjTi2905 IrganoxlOIO 0.5 0.5 0.5 05 0.5 0.5 0.5 0.5 0.5 05 0.5Total 100 100 100 100 100 100 100 100 1005 1005 100.5
Physical properties
VisPt. Air cosidadea 163 ° € ζ cP 7850 6150 1945 4775 9550 7550 6112 763 11650 4512 3975 7900 (IfetZOgtGlycerin what 112 114 107 112 117 115 112 114 109 102 110 92 ii ° c 35.9 36.7 30.9 $ 3 37.9 393 38 -43.0 10.7 11.8 203Twver / C 75 78.4 72.1 77.6 77.6 79.6 80.7 773 77 65.6 79.6ff®25’Cdinas 1.63x10 * 7 2: 23x10 * 7 6.70x10 * 6 1.75x10 * 7 2.46x10 * 7 2.62x10 * 7 1.90x10 * 7 <3.0x10 * 7 1.75x10 * 6 Ι.41Χ14Γ6 4.52 x 100
Percent (%) of creep retention at 38 ° C
Initial 1 62 67 36 64 79 $ 2 78 64 34 31 32 70Example 84 Example 84 Example 84 ie WO deWO from WO 2006/102150 2006/102150 2006/10215 A2 from Dow A2 from Dow 0A2da Dow
TABLE 3A
Raw material rl 1712-501W8 1712-5ON40 1712-50N41 17MN-42 1712-50N-43 1712-50ΪΪ-44 1712-50N-45 1712-50N47 1712-50N-48 H4237 Nynas222B 10 10 10 10 1010 1010IndopdH-lOÜ 10 Eastoflex 1060 19595145 EastotoHIOOR 60 60 60 60 60 60 60 60 60 60Epolene 14.5 MV 2514 props14.5Affinity GA1900 14.5 245Vistarnaxx6202 145 Vistamaxx232014.5LtcocensPP1302 145 lot 9817 15 15 15 15 10 15 20 15 15 15IrganoxWlO 05 0.5 0..5 05 05 05 0.5 05 05 0.5Total 100 100 100 100 100 100 100 100 100 100Physical properties Viscosity at | 63 ° C>I cP 5200 4700 6365 40500 3480 12520 11250 3400 8125 22620 7900 Softening;Glycerin, OQ 109 110 111 114 109 102 114 111 114 126 92 Percentage (%) of creep retention a Initial 76 72 74 75 60 81 81 68 79 76 70
EXAMPLE 4
Table 4 shows the initial and week-old peeling forces of five different compositions (42-J-A, 42-J-B, 42-J-C, 110 and 100-A) with
38/38 a 4 gsm adhesive addition when used in an application construction using polyethylene film (PE) and non-woven substrates (NW). These five formulas are compared with three different compositions (42, 42-F and 42-J) that contain OBC, but no secondary polymers, as well as a commercially available SBS-based thermofusible bypass 5 (H4073) available from Bostik, Inc. for construction applications. From these results it is clear that formulas 42-JA, 42-JB, 42-JC, 110 and 100-A are suitable to meet the requirements that the present invention has described because they all have adequate peeling strength that are comparable with 10 H4073, but formulas 42, 42-F and 42-J have viscosity above desirable, and therefore are not suitable for construction applications.
TABLE 4
Raw material 174242 1W 1712424 171242JA 17124ΝΊ 1712424C 1712410 1712-1104 H4073 Nynas222B 21 21 21 18 18 21 21 21Eastoftex 1060 8 105 10 AflfflityGAlü 10 8MacHIOOR 575 30 FiccotacW) 573 57.5 30 57.5 573 583taSuUO57.5 yacht 9807 2l 21 21 16 11 11 [| 12li ^ anoxlOlO 0.5 05 05 0.5 0.5 0.5 03 0.5W iro 1 1ÕÕ 100 100 100 100 100 Physical properties....., ............ - —i— Viscosity at Çp 11070 11020 7812 5642 2920 2400 2325 2470 2800 Pt. A. OÇ Í07 106 107 103 103 102 90 90 78 T & t 23 ° C 20 ° C 20 ° C 21 ° C 23 ° C 2Γ0 20K 20.0 ° C 23’C Txover / C 69Ϊ 69T 69 ° C^ predominant ^ predominant predominant θ * 0 ^and predominant 73’C G '@ 25 ° C 458x10 146x10 2.81x10 ^s 254x10 1.67x10 9.17 x10 ^s 125x11 / 1.27xlÔ ^à 1.34x10 Average peeling force (grams) jjj QCU addition 3 turns ......... - - —- ~ ---- * - ¹ L— sPE / NW Initial 68 715 444 270 484 399 400 410 340 1 week old 92 815 526 402 805 602 600 600 411
1/3

权利要求:
Claims (24)
[1]
1. Thermosetting adhesive composition, characterized by the fact that it comprises a mixture of the following components:
5% to 50% by weight of an olefin block copolymer;
10% to 70% by weight of a first adhesive resin having a softening point of at least 95 ° C;
0 to 65% of the second adhesive resin, being different from the first adhesive resin;
0% to 60% by weight of a plasticizer;
0% to 20% by weight of an aromatic reinforcing resin having a softening point equal to or greater than 115 ° C;
1% to 40% by weight of a secondary polymer having relatively low crystallinity, where the low crystallinity of the secondary polymer is determined by Differentiated Scanning Calorimetry (DSC), being greater than 30 Joules / gram and equal to or less than 250 Joules / gram, and in which such secondary polymer is selected from the group consisting of: (i) a single-site or ethylene-based copolymer catalyzed by metallocene with a C ₃ to C ₁₈ alpha-olefin comonomer, (ii) a single-site copolymer or catalyzed by propylene-ethylene metallocene, (iii) a mixture of ethylene-based copolymers, (iv) a mixture of propylene-ethylene copolymers, and (v) a mixture of one or more of the copolymers ethylene base with one or more of the propylene-ethylene copolymers; such secondary polymer being a polymer that is different from the olefin block copolymer, the first and second adhesive resins, and the reinforcement resin; and
0.1% to 5% by weight of a stabilizer;
where the total of the components is 100% by weight of the composition and the viscosity of the composition, being measured via ASTEM D32236-88, is equal to or less than 20,000 mPas at 163 ° C.
[2]
2. Composition, according to claim 1, characterized by the fact that it still includes from 1% to 25% by weight of an auxiliary polymer selected from the group consisting of SB, SI, SIS, SBS, EVA, SEB, SEEPS, SIBS, SEBS, SEP, SEPS, SBBS and mixtures thereof, such an auxiliary polymer being different from the olefin block copolymer, the first and second adhesive resin, the reinforcement resin, and the secondary polymer.
[3]
3. Composition according to claim 1, characterized by the fact that it comprises from 10% to 30% by weight of such an olefin block copolymer.
Petition 870190088353, of 06/09/2019, p. 8/10
2/3
[4]
4. Composition according to claim 1, characterized by the fact that it comprises from 12% to 20% by weight of such olefin block copolymer.
[5]
5. Composition according to claim 1, characterized by the fact that it comprises from 2% to 30% by weight of said plasticizer.
[6]
6. Composition according to claim 1, characterized by the fact that said first adhesive resin has a softening point of 95 ° C to 140 ° C.
[7]
7. Composition according to claim 1, characterized by the fact that such composition has a viscosity equal to or less than 15,000 mPas at 163 ° C.
[8]
8. Composition according to claim 1, characterized by the fact that such composition has a viscosity equal to or less than 12,000 mPas at 163 ° C.
[9]
9. Composition according to claim 1, characterized by the fact that it comprises from 2% to 15% by weight of said aromatic reinforcing resin.
[10]
10. Composition according to claim 1, characterized by the fact that the aromatic reinforcing resin is a product of the polymerization of pure monomers.
[11]
11. Composition according to claim 1, characterized by the fact that the aromatic reinforcing resin has a softening point of 115 ° C to 160 ° C.
[12]
12. Composition according to claim 1, characterized by the fact that the aromatic reinforcing resin has a softening point of 115 ° C to 140 ° C.
[13]
13. Composition according to claim 1, characterized by the fact that the aromatic reinforcing resin has a softening point of 120 ° C to 140 ° C.
[14]
14. Composition, according to claim 1, characterized by the fact that it has 40% to 65% by weight of said first resin.
[15]
15. Composition according to claim 1, characterized by the fact that it has from 50% to 60% by weight of said first adhesive resin.
[16]
16. Composition according to claim 1, characterized by the fact that said composition has at least 60% retention of the initial bond.
Petition 870190088353, of 06/09/2019, p. 9/10
3/3
[17]
17. Composition according to claim 1, characterized by the fact that said composition has at least 70% retention of the initial bond
[18]
18. Composition, according to claim 1, characterized by the fact that said composition has upelo less than 80% of initial bond retention.
[19]
19. Composition according to claim 1, characterized by the fact that said secondary polymer has a crystallinity equal to or greater than 30 Joules / gram and equal to or less than 150 Joules / gram.
[20]
20. Composition according to claim 1, characterized by the fact that said secondary polymer has a crystallinity equal to or greater than 30 Joules / gram and equal to or less than 100 Joules / gram.
[21]
21. Composition according to claim 1, characterized by the fact that it comprises from 2% to 30% by weight of said secondary polymer.
[22]
22. Composition according to claim 1, characterized by the fact that the first adhesive resin is selected from the group consisting of aliphatic hydrocarbon resins and their hydrogenated derivatives, hydrogenated cycloaliphatic hydrocarbon resins, hydrogenated or modified aliphatic cycloaliphatic hydrocarbon resins aromatic, aliphatic modified aromatic hydrocarbon resins, partially or completely hydrogenated aromatic hydrocarbon resins, styrene and polyiterpene resins.
[23]
23. Composition, according to claim 1, characterized by the fact that said plasticizer is selected from the group consisting of mineral oil and liquid polybutene.
[24]
24. Composition, according to claim 1, characterized by the fact that it still includes a wax selected from the group consisting of petroleum waxes, microcrystalline waxes, low molecular weight polyethylene and polypropylene, synthetic waxes and polyolefin waxes.

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法律状态:
2017-02-07| B15I| Others concerning applications: loss of priority|

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2017-05-02| B12F| Other appeals [chapter 12.6 patent gazette]|

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2018-04-10| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-02-05| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|

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2019-06-11| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2019-11-26| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 23/07/2010, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 23/07/2010, OBSERVADAS AS CONDICOES LEGAIS |

优先权:

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申请号 | 申请日 | 专利标题

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US22843509P| true| 2009-07-24|2009-07-24|

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US61/228,435|2009-07-24|

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PCT/US2010/043119|WO2011011729A1|2009-07-24|2010-07-23|Hot melt adhesive based on olefin block copolymers|

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