• 专利附录
  • 专利说明
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    • 专利摘要:
    METHOD OF MANUFACTURING PAPER CONTAINING A HIGHER CONTENT OF FILLING MATERIAL, of the present patent application, presents a method of producing paper with a higher proportion of mineral filler particles than would otherwise be possible without the expected loss of paper strength with pre-flocculation of the filler particles; the method allows the use of a larger amount of filler particles by coating at least some of the filler particles with a material that prevents the fillers with a material that prevents the filler materials from adhering to an additive. of resistance. The strength additive holds the paper fibers tightly and is not discarded into the filler particles.
    公开号:BR112012022861B1
    申请号:R112012022861-7
    申请日:2011-03-18
    公开日:2021-05-11
    发明作者:Weiguo Cheng；Ross T. Gray
    申请人:Nalco Company；
    IPC主号:
    专利说明:

    Cross Reference to Related Applications None. Statement with respect to Federal Government Sponsored Research or Development Not applicable. State of the art
    [001] The present patent application refers to a method to increase the strength of a paper matrix of fibers produced in a paper manufacturing process. The paper matrix comprises water and solids and typically contains from 4 to 8% water. The solid portion of the paper matrix includes fibers (usually cellulose-based fibers) and may also include filler material. Increasing the strength of the paper matrix would allow a person to increase the proportion of solids representing the filler material. This is desirable because it reduces raw material costs, reduces the energy required in the papermaking process, and increases the optical properties of the paper. The Prior Art discloses a paper matrix having a solid portion between 10% and 40% filler material. The Prior Art, however, also reveals that the increase in filler content coincides with a loss of strength in the resulting paper.
    [002] Fillers are mineral particles added to the paper matrix during the papermaking process in order to improve the resulting paper's opacity and light-reflecting properties. Some examples of fillers are described in US Patent Number 7,211,608. Fillers include inorganic or organic particles or pigments used to increase opacity or gloss, or to reduce the cost of the sheet of paper or cardboard. Some examples of fillers include one or more of the following: kaolin clay, talc, titanium dioxide, alumina trihydrate, barium sulfate, magnesium hydroxide, pigments such as calcium carbonate, and similar substances. Previous attempts to increase the filler content in the paper without losing the strength of the paper are described in British Patent GB 2016498, and in US Patent Numbers 4,710,270, 4,181,567, 2,037,525, 7,211,608 and 6,190,663.
    [003] The calcium carbonate fill material is supplied in two forms, CCN (natural calcium carbonate) and CCP (precipitated calcium carbonate). CCN is naturally occurring calcium carbonate rock and CCP is synthetically produced calcium carbonate. Because it has a larger specific surface area, CCP has greater light scattering ability and provides better optical properties to the resulting paper. However, for the same reason, the matrix of paper with CCP filler material produces a paper that is weaker than paper with CCN filler.
    [004] The strength of paper is a function of the number and strength of the bonds formed between the interwoven fibers of the paper matrix. Filler particles with greater surface area are more likely to become involved with those fibers and interfere with the number and strength of those bonds. Because of its larger surface area, CCP filler material interferes with those bonds more than CCN does.
    [005] As a result, papermakers are forced to make an unwanted switch. They must choose between selecting a paper with higher strength but lower optical properties, or they must select a paper with higher optical properties but lower strength. Thus, there is a clear need for a papermaking method that facilitates a greater amount of filler in the paper, a paper that exhibits high opacity, and a paper with filler that has a high degree of strength. Brief Summary of the Invention
    [006] At least one application of the present patent application is directed to a method of manufacturing paper containing a higher content of filler material. The method comprises the steps of: adding a first flocculating agent to an aqueous dispersion in an amount sufficient to uniformly blend into the dispersion without causing significant flocculation of the filler particles, adding a second flocculating agent to the dispersion after adding the first flocculating agent in an amount sufficient to initiate flocculation of the filler particles in the presence of the first flocculating agent, the second flocculating agent being oppositely charged to the first flocculant, combining the filler particles with the fiber mass of paper, treating the blend with at least one strength additive, and forming a paper matrix from the blend. The paper fiber mass comprises a plurality of fibers and water, and the initiated flocculation improves the performance of the strength additive in the paper matrix.
    [007] At least one application of the present patent application is directed to this method, in which the strength of the paper created by the paper manufacturing process is increased by an amount greater than the sum of: the strength improvement provided by the pre-flocculation process using the first and second flocculating agents and the improvement in strength provided by the strength additive itself.
    [008] The filler material can be selected from the group consisting of calcium carbonate, kaolin clay, talc, titanium dioxide, alumina trihydrate, barium sulfate and magnesium hydroxide. Paper fiber can be cellulose fiber. The method may further comprise the step of shearing the dispersion in order to obtain a predetermined flake size. The filler flakes can have an average particle size of 10-100 µm. The first and second flocculating agents can have an RSV of at least 2dl/g. The first flocculating agent can be anionic. The O-additive may be a Glyoxylated Acrylamide/DADMAC [diallyldimethylammonium chloride] copolymer. The ratio of strength additive to the solid portion of the paper matrix can be from 0.3 to 5 kg strength additive per ton of paper matrix. The first flocculating agent can be a copolymer of acrylamide and sodium acrylate. The strength additive can be a cationic starch. The strength additive and the second flocculating agent can carry the same charge.
    [009] The second flocculating agent can be selected from the list consisting of acrylamide copolymers with DMAEM, DMAEA, DEAEA, DEAEM. The second flocculating agent can be in the form of a quaternary ammonium salt made with a salt selected from the list which consists of dimethyl sulfate, methyl chloride, benzyl chloride and any combination thereof. The filler material can be anionically dispersed and a low molecular weight, cationic coagulant is added to the dispersion to at least partially neutralize its anionic charge prior to the addition of the first flocculating agent. The second flocculating agent may have a charge which is opposite to the charge of the first flocculating agent. The filler flakes can have an average particle size of 10-100 µm. The filler material can be selected from the group consisting of calcium carbonate, kaolin clay, talc, titanium dioxide, alumina trihydrate, barium sulfate and magnesium hydroxide. The low molecular weight composition can be a cationic coagulant, the first flocculant can be an anionic flocculant, the second flocculant can be a cationic flocculant, and both flocculants can have a molecular weight of at least 1,000,000. Description of Figures
    [0010] A detailed description of the present patent application is described from this point on with specific reference being made to the drawing in which: Figure 1 is a graph showing the improvement in strength of paper made in accordance with the present application for an invention patent. Detailed description of the invention
    [0011] For the purposes of this application, the definition of these terms is as follows:
    [0012] "Coagulant" means a material composition with a charge density of higher and lower molecular weight than a flocculant, which, when added to a liquid containing finely divided suspended particles, destabilizes and aggregates solids through neutralization mechanisms of ionic charge.
    "DMAEM" means dimethylaminoethylmethacrylate as described and defined in US Patent 5,338,816.
    "DMAEA" means dimethylaminoethylacrylate as described and defined in US Patent 5,338,816.
    "DEAEA" means diethylaminoethyl acrylate as described and defined in US Patent 6,733,674.
    "DEAEM" means diethylaminoethyl methacrylate as described and defined in US Patent 6,733,674.
    [0017] "Flocculant" means a material composition with a low charge density and high molecular weight (in excess of 1,000,000) which, when added to a liquid containing finely divided suspended particles, destabilizes and aggregates solids through the mechanism of interparticle binding.
    [0018] "Flocculating Agent" means a composition of matter that, when added to a liquid, destabilizes and aggregates finely divided particles and colloidal suspended in the liquid in the flakes.
    [0019] "CCN" means natural calcium carbonate, which is manufactured by grinding naturally occurring calcium carbonate rock.
    [0020] "CCP" means precipitated calcium carbonate that is synthetically produced.
    [0021] "Pre-flocculation" means the modification of filler particles into agglomerates by treatment with a particular flocculating agent selected based on the size distribution and stability of the flake that the flocculating agent will form.
    [0022] In the event that the above definitions or a definition expressed elsewhere in this application is inconsistent with a meaning (explicit or implicit) that is commonly used, in a dictionary, or expressed in an incorporated source as a reference to that application, the particular application and claimed terms are understood to be interpreted in accordance with the definition of that application, and not in accordance with the common definition, dictionary definition, or the definition which has been incorporated by reference.
    [0023] At least one application of the present patent application is a method of making paper, which is strong, has a high content of filler and has superior optical properties. In at least one application of the present patent application, the papermaking method comprises the steps of providing filler material, pre-treating at least some amount of filler material by preflocculation leading to a decrease in adsorption of a strength additive in the filler material, and add both the pre-flocculated filler mixture and the strength additive to the paper matrix.
    [0024] Pre-flocculation is a process in which the material is treated by two flocculating agents in order to optimize the size distribution and stability of the flakes under a particular shear force before their addition to the paper mass. The particular chemical environment and the high liquid shear rates present in modern high speed papermaking require the filler flakes to be stable and shear resistant. The flake size distribution provided by a pre-flocculation treatment should minimize the reduction in sheet strength with increased filler content, minimize the loss of optical efficiency of the filler particles, and minimize the negative impacts of the uniformity and printability of the sheet. Furthermore, the entire system must be economically viable. Examples of pre-flocculation methods applicable to this patent application are described in US Published Patent Application 2009/0065162 A1 and US Patent Application 12/431356.
    [0025] It has been known for some time that the addition of strength additives to the paper matrix increases the strength of the resulting paper. Some examples of strength additives are described in US Patent Number 4,605,702. Some examples of strength additives are cationic starches, which adhere to cellulose fibers and bind them tightly together.
    [0026] Unfortunately, it is not practical to add large amounts of strength additives to compensate for the weakness that results from using large amounts of filler material in the paper matrix. One reason is because strength additives are expensive and the use of large amounts of additives would result in production costs that are not commercially viable. In addition, adding too much strength additive negatively affects the papermaking process and inhibits the operability, in many ways, of papermaking equipment. As an example, in the context of cationic starch strength additives, cationic starch slows down the draining and dewatering process, which drastically delays the papermaking process.
    [0027] The addition of filler material in the paper matrix reduces the effectiveness of the strength additive. As the filler material has a much larger specific surface area than fiber, most of the strength additives added in the pulp used to make the paper go to the filler material surfaces and therefore there is less strength additive available. to join the cellulose fibers. This effect is more acute with CCP compared to CCN because CCP has a much larger surface area and is able to adsorb more strength additive. One method of treating this situation is to pre-treat the filler material with a coagulant, as described in US Patent Application 12/323976. Another method involves using pre-flocculation instead of a coagulant.
    [0028] In at least one application, the content of filler material in the paper is increased by the following method: An aqueous dispersion of fillers is formed and the fillers are pre-flocculated before being added to the fiber mass of paper. A first flocculating agent is added to the dispersion in an amount sufficient to uniformly blend into the dispersion without causing significant flocculation of the filler particles. A second flocculating agent is then added after the first flocculating agent, in an amount sufficient to initiate flocculating of the filler material in the presence of the first flocculating agent, the second flocculating agent being of opposite charge to the first flocculating agent. A paper matrix is formed by combining the pre-flocculated filler material with the fiber mass and treating this combination with the strength additive. Pre-flocculation of the filler material improves the performance of the strength additive. The fiber mass comprises fibers, fillers and water.
    [0029] In at least one application, the fibers are predominantly cellulose-based. In at least one application, the flocculated dispersion is sheared to obtain an especially desired particle size.
    [0030] Although the pretreatment of filler particles is known in the art, prior art filler particle treatment methods are not targeted, affecting the adhesion of the strength additive to filler particles with two flocculants. In fact, many prior art pretreatments increase the adhesion of the strength additive to the filler particles. For example, US Patent Number 7,211,608 describes a method of pretreating filler particles with hydrophobic polymers. This pretreatment, however, does nothing to the adhesion between the strength additive and the filler particles, and simply repels water to counterbalance excess water absorbed by the strength additive. In contrast, the present patent application decreases the interactions between the strength additive and the filler particles and results in an unexpectedly significant increase in the strength of the paper. This can be better appreciated by referring to figure 1.
    [0031] Figure 1 illustrates that a paper produced from a paper matrix that includes the CCP filler material tends to become weaker as more CCP filler material is added. When a large amount of CCP is added (more than 25%), the addition of a strength additive adds little strength to the paper. However, paper made from pre-flocculated CCP filler material with a strength additive increases the strength of the paper to a degree that it becomes stronger than paper containing 10% less CCP that is not pre-flocculated . Even more surprising was the fact that paper containing pre-flocculated CCP without a strength additive was almost as strong as paper with the strength additive.
    [0032] As a result, it is possible to reach at least two conclusions, 1) the strength agent is more effective in increasing the sheet strength with pre-flocculated filler material than with untreated filler material and 2) there is a synergistic effect of the combination of the strength agent and the pre-flocculation of the filler material which makes it superior to the additive effects resulting from the sum of the strength agent alone plus the pre-flocculation of the filler material alone. As a result, pre-flocculation of the PCC filler material leads to the production of paper that is unexpectedly strong.
    [0033] At least some of the filler materials included in this patent application are well known and commercially available. They include any inorganic or organic particle or pigment used to increase opacity or gloss, reduce porosity, or reduce the cost of the sheet of paper or cardboard. The most common filling materials are calcium carbonate and clay. However, talc, titanium dioxide, alumina trihydrate, barium sulfate and magnesium hydroxide are also suitable fillers. Calcium carbonate includes natural calcium carbonate (CCN) in a dry or dispersed form of paste, chalk, precipitated calcium carbonate (CCP) or any morphology, and precipitated calcium carbonate in a dispersed form of paste. Dispersed paste forms of CCN or CCP are typically produced using polyacrylic acid polymer dispersants or sodium polyphosphate dispersants. Each of these dispersants imparts a significant anionic charge to the calcium carbonate particles. Kaolin clay slurries are also dispersed using polyacrylic acid or sodium polyphosphate polymers.
    [0034] In at least one application, the strength additive carries the same charge as the second flocculating agent. Strength additives covered by this patent application include any of the material compositions described in US Patent 4,605,702 and US Patent Application 2005/0161181 A1 and, in particular, the various Glyoxylated Acrylamide/DADMAC copolymer compositions described in them. An example of a Glyoxylated Acrylamide/DADMAC copolymer composition is Nalco Product No. 64170 (manufactured by Nalco Company, Naperville, Illinois).
    [0035] In at least one application, the filling materials used are CCP, CCN and/or kaolin clay. In at least one application, the fillers used are CCP, CCN and/or kaolin clay with polyacrylic acid polymer dispersants or mixtures thereof. The ratio of strength additive to solid paper matrix can be 3 kg of additive per ton of paper matrix.
    [0036] In at least one application, the effectiveness of the synthetic strength additive is independent or independent of the presence of low amounts, or no amount of starch in the paper matrix. In the prior art disclosures, it is known that the addition of 10 to 20 lbs of starch per ton of paper matrix increases the strength of the resulting paper. Adding materials in such large quantities, however, is inconvenient and less than ideal. The use of synthetic strength additives, in contrast, allows similar strength performance to be achieved while requiring the addition of much less strength additive material to the paper matrix. In at least one application, the synthetic strength additive is either cationic or anionic or contains both cationic and anionic functional groups.
    [0037] Unfortunately, synthetic strength additives are known to be much more expensive than starch. In some processes, the cost of using large amounts of starch can be less expensive than smaller, more easily manageable amounts of synthetic strength additives. The combination of the additional strength effects of synthetic strength additives at low dosages in combination with pre-flocculation allows unexpected degrees of strength to be observed than would be expected with these low strength additive dosages and in the absence of large amounts or of any amount of starch. EXAMPLES
    [0038] The foregoing information can be better understood by reference to the following example, which is presented for illustrative purposes and is not intended to limit the scope of the present patent application.
    [0039] A compost containing 25% softwood from pine and 75% hardwood from eucalyptus was produced. Both softwood and hardwood were pulped from the dry material. The filler material used was Albacar HO CCP, purchased from Specialty Minerals Inc. The filler material pre-flocculation was performed with the double flocculant approach described in example 14 of US Patent Application 12/431356. During sheet preparation, 6 lb/ton. of strength additive (Nalco 64114, a Glyoxylated Acrylamide/DADMAC copolymer available from Nalco Company, Naperville, IL, USA) were added. The results are shown in FIG. 1.
    [0040] Although the present patent application can be applied in many different ways, specific preferred applications of the present patent application are shown in the drawings and described in detail in this document. The present disclosure is an example of the principles of the present application and is not intended to limit the present application to the particular applications illustrated. All patents, patent applications, scientific documents and any other reference materials mentioned in this document are incorporated by reference in their entirety. Furthermore, the present patent application encompasses any possible combination of some or all of the various applications described and incorporated herein.
    [0041] The above disclosure is intended to be illustrative and not exhaustive. This description will suggest many variations and alternatives for someone with ordinary skill in this technique. All such alternatives and variations are intended to be included within the scope of the claims, where the term “comprising” means “including, but not limited to”. Those familiar with the art may recognize other equivalents to the specific applications described herein, which equivalents are also intended to be covered by the claims.
    [0042] It is understood that all variations and parameters disclosed here comprise any and all subvariations included, and any number between the outcomes. For example, a stated range of “1 to 10” should be considered to include any and all subvariations between (and inclusive) the minimum value of 1 and the maximum value of 10; that is, all subvariations starting with a minimum value of 1 or more, (eg 1 to 6.1), and ending with a maximum value of 10 or less, (eg 2.3 to 9.4, 3 to 8, 4 to 7 ), and finally each number 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 contained in the variation.
    [0043] This completes the description of the preferred and alternative applications of the present patent application. Those skilled in the art may recognize other equivalents to the specific application described herein, which equivalents are also intended to be covered by the claims appended hereto.
    权利要求:
    Claims (23)
    [0001]
    1. "MAKING METHOD OF PAPER, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", the method comprising the steps of: adding a first flocculating agent to an aqueous dispersion of filler particles in an amount sufficient to be mixed with uniformly dispersing without causing significant flocculation of the filler particles; adding a second flocculating agent to the dispersion after adding the first flocculating agent in an amount sufficient to initiate flocculation of the filler particles in the presence of the first flocculating agent, the second flocculating agent being of opposite charge to the first flocculating agent, characterized in that no paper mass is present during flocculation; combining the filler particles with a mass of paper fibers; treating the combination with at least one strength additive selected from the group consisting of synthetic strength additives; and forming a paper matrix from the blend; the mass of paper fibers comprising a plurality of fibers and water; and flocculation initiated by improving the performance of the strength additive in the paper matrix, where the strength additive is not starch, where the first flocculating agent is a copolymer of acrylamide and sodium acrylate, and where the first and second flocculating agents have an RSV of at least 2dL/g.
    [0002]
    2. "PAPER MANUFACTURING METHOD, CONTAINING A GREATER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the strength of the paper manufactured by the paper manufacturing process is increased by an amount greater than the sum of: da improvement of the strength provided by the pre-flocculation process, using the first and second flocculating agents, and the improvement of strength provided by the strength additive itself.
    [0003]
    3. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the filling material is selected from the group consisting of calcium carbonate, kaolin clay, talc, titanium dioxide , alumina trihydrate, barium sulfate and magnesium hydroxide.
    [0004]
    4. "PAPER MANUFACTURING METHOD, CONTAINING A GREATER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the paper fiber is cellulose fiber.
    [0005]
    5. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that it further comprises the dispersion shear step after flocculation has been started to obtain a flake size predetermined between 10 and 100 microns.
    [0006]
    6. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the first flocculating agent is anionic.
    [0007]
    7. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the strength additive is a copolymer of glyoxylated acrylamide/DADMAC.
    [0008]
    8. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the proportion of strength additive in relation to the solid portion of the paper matrix is from 0.3 to 5 kg of strength additive per ton of paper matrix.
    [0009]
    9. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the filling material is anionic dispersed and a low molecular weight cationic coagulant is added to the dispersion to , at least partially neutralize its anionic charge before adding the first flocculating agent.
    [0010]
    10. "PAPER MANUFACTURING METHOD, CONTAINING A GREATER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the strength additive and the second flocculating agent carry the same charge.
    [0011]
    11. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the second flocculating agent is selected from the list consisting of copolymers of acrylamide with DMAEM, DMAEA, DEAEA, DEAEM.
    [0012]
    12. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 11, characterized in that the second flocculating agent is in the form of a quaternary ammonium salt made with a salt selected from the list consisting of sulfate of dimethyl, methyl chloride, benzyl chloride and any combination thereof.
    [0013]
    13. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 9, characterized in that the low molecular weight composition is a cationic coagulant, the first flocculating agent being an anionic flocculant, the second flocculating agent is a cationic flocculant and both flocculants have a molecular weight of at least 1,000,000.
    [0014]
    14. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 1, characterized in that the proportion of the first flocculating agent to the filling material is between 0.2 and 2.0 kg of flocculating agent per ton of filler material and the ratio of second flocculating agent to filler material is between 0.2 and 2.0 kg of flocculating agent per ton of filler.
    [0015]
    15. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER FILLING MATERIAL CONTENT", the method comprising the steps of: adding a first flocculating agent to an aqueous dispersion of filler particles in an amount sufficient to mix with uniformly dispersing without causing significant flocculation of the filler particles; adding a second flocculating agent to the dispersion after adding the first flocculating agent in an amount sufficient to initiate flocculation of the filler particles in the presence of the first flocculating agent, the second flocculating agent being of opposite charge to the first flocculating agent; combining the filler particles with the mass of paper fibers; treating the combination with at least one strength additive selected from the group consisting of synthetic strength additives; and forming a paper matrix from the blend; the mass of paper fibers comprising a plurality of fibers and water; and flocculation initiated by improving the performance of the strength additive in the paper matrix, characterized in that the strength additive is not starch and in which the filler material is anionic dispersed and a low molecular weight cationic coagulant is added to the dispersion to neutralize, at least partially, its anionic charge before the addition of the first flocculating agent.
    [0016]
    16. "PAPER MANUFACTURING METHOD, CONTAINING A GREATER CONTENT OF FILLING MATERIAL", according to claim 15, characterized in that the strength of the paper manufactured by the paper manufacturing process is increased by an amount greater than the sum of: da improved strength provided by the pre-flocculation process using the first and second flocculating agents and improved strength provided by the strength additive itself.
    [0017]
    17. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 15, characterized in that the filling material is selected from the group consisting of calcium carbonate, kaolin clay, talc, titanium dioxide , alumina trihydrate, barium sulfate and magnesium hydroxide.
    [0018]
    18. "PAPER MANUFACTURING METHOD, CONTAINING A GREATER CONTENT OF FILLING MATERIAL", according to claim 15, characterized in that the paper fiber is cellulose fiber.
    [0019]
    19. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 15, characterized in that it further comprises the dispersion shear step after flocculation has been started to obtain a flake size predetermined between 10 and 100 microns.
    [0020]
    20. "PAPER MANUFACTURING METHOD, CONTAINING A GREATER CONTENT OF FILLING MATERIAL", according to claim 15, characterized in that the strength additive and the second flocculating agent carry the same charge.
    [0021]
    21. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 15, characterized in that the second flocculating agent is selected from the list consisting of copolymers of acrylamide with DMAEM, DMAEA, DEAEA, DEAEM.
    [0022]
    22. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 21, characterized in that the second flocculating agent is in the form of a quaternary ammonium salt made with a salt selected from the list consisting of sulfate of dimethyl, methyl chloride, benzyl chloride and any combination thereof.
    [0023]
    23. "PAPER MANUFACTURING METHOD, CONTAINING A HIGHER CONTENT OF FILLING MATERIAL", according to claim 15, characterized in that the proportion of the first flocculating agent to the filling material is between 0.2 and 2.0 kg of agent flocculant per ton of filler material and the ratio of second flocculating agent to filler material is between 0.2 and 2.0 kg of flocculating agent per ton of filler material.
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    同族专利:
    公开号 | 公开日
    US8647472B2|2014-02-11|
    WO2011116253A3|2012-02-02|
    CA2793849A1|2011-09-22|
    CN103038419B|2015-04-29|
    BR112012022861A2|2020-08-25|
    US20110226433A1|2011-09-22|
    JP5828883B2|2015-12-09|
    KR101767460B1|2017-08-11|
    CA2793849C|2018-04-03|
    CN103038419A|2013-04-10|
    KR20130016206A|2013-02-14|
    JP2013522492A|2013-06-13|
    WO2011116253A2|2011-09-22|
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    法律状态:
    2020-09-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-09-15| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-02| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-11| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 11/05/2021, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/727,299|US8647472B2|2007-09-12|2010-03-19|Method of increasing filler content in papermaking|
    US12/727,299|2010-03-19|
    PCT/US2011/028917|WO2011116253A2|2010-03-19|2011-03-18|Method of increasing filler content in papermaking|
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