• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    LIVE ARTICULATED COMPONENT AND METHODS FOR PREPARING A HDPE The present invention relates to a composition of high density polyethylene (HDPE) comprising at least a first component of high density polyethylene with a density of 0.940-0.968 g / cm3 and a I2.16 melt index of 0.5-10.0 dg / min. and a melt flow rate (flow index I21.6 at 190 ° C divided by the melt index I2.16 at 190 ° C) of at least 25. A second component of HDPE can be included in the composition with an index of fusion I2.16 greater than 10 dg / min. and molten material flow ratio of 30 or less. The disclosed compositions are suitable for use in hinged lid applications.
    公开号:BR112014031036B1
    申请号:R112014031036-0
    申请日:2013-06-10
    公开日:2021-01-26
    发明作者:Brett Christopher Domoy；Barrett Albert Unger；Mark T. Jablonka
    申请人:Dow Global Technologies Llc；Unilever Nv；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [0001] The present invention relates to lids formed from polyethylene compositions and, more particularly, it refers to high density polyethylene compositions and closures that deliver high levels of durability of built-in hinges. BACKGROUND OF THE INVENTION
    [0002] Polypropylene (PP) has traditionally dominated the dispensing lid market with built-in hinges since they are easily processed and have good hinge durability characteristics. In addition, it is widely available and has historically had favorable economic characteristics in relation to polyethylene when used for these purposes. These attributes, together with the general balance of properties of PP make it a frequent choice for hinge-cap applications as well as many molding applications.
    [0003] However, the historically favorable economic characteristics of the PP have been challenged in recent years due to the rising costs attributable to the industry and the dynamics of the market. The increasing price volatility and high costs have led to a reduction in PP capacity in North America, further challenging the availability of supply and placing increasing pressures on the cost of goods on users of the material. High Density Polyethylene (HDPE) offers favorable impact and low temperature resistance compared to PP. These characteristics may allow for additional attributes of design flexibility and increased performance of molded packaging, especially in the area of dispensing lids with built-in hinges. However, the durability of the hinge when using known HDPE compositions has been less than acceptable compared to PP. In addition, one of the PP by HDPE often introduces dimensional differences that may require high capital expenditures and investment in tooling. The subject of the present invention is aimed at overcoming, or at least reducing the effects of one or more of the problems set out above. BRIEF SUMMARY OF THE INVENTION
    [0004] A high density polyethylene (HDPE) composition is revealed that can be economically used in conventional injection molding processes that produce hinge durability in addition to that of conventional HDPE materials used in comparable applications. The disclosed HDPE compositions can be used to form dispensing lids with built-in hinge functionality that have comparable processing and application performance to PP-based dispensing lids, thereby overcoming many of the historical deficiencies of HDPE as a substitute for PP in these applications , and more generally in the area of molded articles. On many occasions, the disclosed HDPE compositions can serve as a direct replacement for polypropylene. BRIEF DESCRIPTION OF THE DRAWINGS
    [0005] Fig. 1 is a viscosity graph as a function of the shear rate for several comparative and demonstrated configurations.
    [0006] Fig. 2 is a graph of corrected shear viscosity as a function of the corrected shear rate for various comparative and demonstrated configurations.
    [0007] Fig. 3 is a detailed perspective view from the top of the partial double-hinged lid configuration illustrated in Figures 4 and 5.
    [0008] Fig. 4 is a perspective view from the top of a partial double-hinge cover configuration shown in an open position.
    [0009] Fig. 5 is a perspective view from the bottom of the partial double-hinged lid configuration of Fig. 4 shown in an open position.
    [0010] Fig. 6 is a detailed view of the top plane of a configuration of a butterfly hinge design of a cover shown in the open position.
    [0011] Fig. 7 is a detailed perspective view of the butterfly hinge configuration of Fig. 6 taken from the top.
    [0012] Fig. 8 is an additional detailed perspective view of the butterfly hinge configuration of Fig. 6 taken from the top.
    [0013] Fig. 9 is a top plan view of an eccentric cover configuration hinged in the center with a built-in double strip hinge.
    [0014] Fig. 10 is a cross-sectional view of Figure 9 taken along line A-A.
    [0015] Fig. 11 is a detailed cross-sectional elevation view of a configuration of an impartial portion of a cover hinge.
    [0016] Fig. 12 is a perspective view of an application of a hinged lid incorporated in an open configuration without an inclination element.
    [0017] Fig. 13 is a perspective view of a hinge cover configuration incorporated in an open configuration without an inclination element. DETAILED DESCRIPTION OF THE INVENTION
    [0018] An HDPE composition capable of being manufactured in a molded article with a built-in hinge characteristic and demonstrating good durability is revealed. The disclosed HDPE composition includes at least one first high density polyethylene resin (HDPE) with a density of .940-0.968 g / cm3 and an I2.16 melt index of 0.5 0.5-10.0 dg / min and a melt flow rate (flow rate I2i, 6 to 190 ° C divided by the melt index I2.16 to 190 ° C) of at least 25, more preferably at least 50, even more preferably at least 55.
    [0019] In a preferred configuration, the composition includes a second resin which has an HDPE with an I2.16 melt index greater than 10 dg / min. and a melt flow ratio of 30 or less, alternatively 25 or less. In some configurations, it is preferred that the first HDPE resin has an Mz (as determined by GPC) greater than 200,000, preferably greater than 220,000. Mz is described in Structure and Rheology of Molten Polymers - from Structure to Flow Behavior and Back Again, by John M. Dealy. The first component of HDPE is preferably between 10 to 90 percent by weight of the molded article, more preferably from 10 to 50 percent, while the second HDPE resin is preferably from 90 to 10 percent, more preferably from 50 to 90 percent. cent.
    [0020] An articulated component formed from the disclosed compositions may include a filler, as in amounts of approximately 0.1-80%. Fillers suitable for this purpose may include, without limitation, glass beads, calcium carbonate, post-consumer recycled material, glass fibers, talc, or any other organic or inorganic filler or combination thereof.
    [0021] An articulated component formed from the disclosed compositions may include additional additives in amounts generally between 1-10,000 ppm of one or more additional additives. Such additives may include, without limitation, polymer processing aids (ppa), sliding components, nucleators, antistatic additives and performance-enhancing organic or inorganic additives or combinations thereof. Particularly effective nucleators include metal salts of hexahydrophthalic acid (HHPA).
    [0022] The disclosed HDPE composition may further comprise additional polyethylene components. Certain configurations of the revealed HDPE composition can be produced in many commercially available continuous reaction processes, mainly those comprising two or more individual reactors in series or in parallel using slurry, gas phase process solution or technology or hybrid reaction systems ( for example, combination of sludge reactor and gas phase). Alternatively, the preferred compositions disclosed can also be produced by mixing off-line 2 or more different polyethylene resins. In a particular configuration, a conventional single-mode Ziegler-Natta HDPE was mixed with a multimodal Ziegler-Natta HDPE, however, it is expected that the various polyethylene components of the revealed multimodal compositions can be produced with alternative catalytic systems, such as metallocene or catalysts. chromium based.
    [0023] The disclosed HDPE compositions exhibit processing characteristics similar to those of the incumbent polypropylene resins and the hinge incorporated in the lid demonstrated acceptable durability. Unique components of the HDPE composition used alone showed a less commercially acceptable combination of processing characteristics and hinge durability. For example, if only a unimodal or even multimodal HDPE Ziegler-Natta that meets the characteristics of the first HDPE components were used, the processing characteristics would be undesirable, and if only a conventional high-flow single-mode Ziegler-Natta HDPE that met the requirements characteristics of the second component of HDPE were used, the durability of the hinge would be unacceptably unsatisfactory. Thus, compositions that have both the first component of HDPE and the second component of HDPE are generally preferred.
    [0024] Table 1 shows the resins that were used to demonstrate various configurations of the revealed composition as used in the hinge components. The polypropylene used is a conventional resin used in the application today.
    [0025] Density measurements were made according to ASTM D792. The molten material flow rate (MFR) is defined as the ratio of the flow index 121.6 to 190 ° C divided by the melt index I2.16 to 190 ° C. Fusion Index measurements were made according to ASTM D1238 (2.16 kg / 190 ° C).
    [0026] Table 1

    [0027] Fig. 1 is a graph of rheological data from the sample at 220 ° C. Comparative Example 1 is 100% RESIN C (the RPC or Random Polypropylene Copolymer). Comparative Example 5 is 100% RESIN A. Comparative Example 6 is 100% RESIN B. Inventive Example 2 contains 90% RESIN B and 10% RESIN A. Inventive Example 3 contains 75% RESIN B and 25% of RESINA A.
    [0028] Figure 1 is a graph of a trend line that illustrates the increased viscosity of Comparative Example 5 at higher shear rates, and the lower viscosity of Comparative Example 6 compared to Comparative Example 1 at low shear rates shear, but approaching Comparative Example 1 at high shear rates. Points are added to the graph to show the rheology of the inventive materials. Both Inventive Example 2 and 3 show rheology in the high shear region very similar to Comparative Example 1, which is 100% CPR. Inventive Example 4 has a higher viscosity in the high shear region than Comparative Example 1, however, it is much lower than Comparative Example 5 and is therefore more easily processed.
    [0029] Table 2 summarizes the maximum injection pressures since the materials are injection molded into hinged lids, demonstrating that as the RESIN A composition in the inventive samples is increased, the maximum injection pressure is reduced allowing an improvement in processing characteristics.
    [0030] Table 2


    [0031] Table 3 summarizes the hinge durability performance of comparative and inventive samples. In order to measure the durability of the hinge, an automatic hinge durability test instrument was used in which the lower part, or flange, of the cover was attached to a stationary cylinder on the instrument and the upper part of the cover was attached to an accessory mobile. The mobile accessory opened and closed the lid from 10 ° from the fully closed position to the normal open position at a rate of 1 cycle per second. The cycle in which a failure indicated by a complete break of the hinge or strip was observed and recorded. The entire hinge durability test was completed at standard atmospheric temperature and pressure.
    [0032] Table 3

    [0033] As expected, Comparative Example 1 produced from 100% RCP, meets the hinge's durability requirements and is commercially used in that manufacture today. Comparative Example 5 is 100% RESIN A, a multimodal HDPE with an MFR> 50, meeting the hinge durability requirements, but as shown above in Fig. 1, the processing characteristics of Inventive Example 5 are not desirable for the process current injection molding since the viscosity between a variety of shear rates is higher than the CPR currently used (RESINA C). Inventive Examples 3 and 4 unexpectedly have good hinge durability, and as shown in Fig. 1, processing characteristics comparable to those of RCP.
    [0034] Table 4 shows the results of a second evaluation of inventive compositions. Comparative Example 1 (100% polypropylene) and Inventive Examples 2, 3 and 6 (100% polyethylene) demonstrate good hinge durability and good processing characteristics. These results indicate that the addition of a multimodal HDPE to a monomodal HDPE in concentrations below 25% but greater than 10% provides good processing characteristics for commercial production and good hinge durability performance for commercial use of the lid.
    [0035] Table 4

    [0036] Additional evaluations are summarized in Table 5. All examples were manufactured in hinged covers as shown in Figures 3, 4, 5 and 11, and tested for hinge durability. None of the Comparative Examples met the preferred minimum requirement for 200-cycle hinge durability.
    [0037] Table 5

    [0038] The effect of dyes, which can improve the appearance of the cap, in Inventive Example 3 is shown in Table 6. Inventive Example 3 was increased with 2% weight of different dyes and then called Inventive Example 15. The The resulting hinges were tested using the hinge durability tester. Each hinge was tested until failure occurred or until 1,000 cycles had been reached, whichever came first. These tests demonstrated that the dyes of the mixture with Inventive Example 3 resulted in comparable or better hinge durability.
    [0039] Table 6
    Note: The dyes Bronze (1), Green (2), Navy Blue (3), Royal Blue (4) and Yellow (6), were obtained from Clariant International Ltd., Rothausstrasse 6, CH-4132 Muttenz, Switzerland as master batches. Transparent Blue (5) was obtained from ColorMatrix, 680 North Rocky River Drive, Berea, Ohio 44017-1628, in liquid form. Dyes are known and commonly used to add color to plastic components.
    [0040] Additional evaluations were carried out to determine the impact of the variation of the properties of the resin on the durability of the hinge. The results are required in Table 7. The hinges of these covers are tested using the hinge durability tester. Each hinge was tested until failure occurred or until 1,000 cycles had been reached, whichever came first.
    [0041] In a first series of experiments, Inventive Examples 16 and 17, it was demonstrated that replacing RESIN A (MFR 65) by RESINA I (a conventional HDPE with a melting index of 2.0 dg / min. at 190 ° C, an MFR of 31 and density of 0.954 g / cm3) in Inventive Example 3 significantly improves hinge durability. The number of hinge cycles for Inventive Examples 16 and 17 was above the 130 hinge cycles demonstrated in Comparative Example 6 (100% RESIN B), see Table 4 above, thus demonstrating that formulations with flow ratios of cast material of 25 or greater show improvement in the performance of the hinge.
    [0042] In a second series of Experiments, Inventive Examples 1820, RESINA B (melting index 44) in the composition of Inventive Example 3 is replaced by RESINA J (a conventional HDPE with a melting index of 66 dg / min. at 190 ° C and density of 0.952 g / cm3). These results demonstrate that it is possible to achieve a significant improvement in the durability of the hinge even using a resin with a higher melting index.
    [0043] Table 7

    [0044] The effect of adding the commercial HHPA nucleator derivative consisting of 330 ppm 1,2-Cyclohexanedicarboxylic acid, Calcium salt (CAS no 491589-22-1) and 170 ppm Zinc Stearate was determined (Table 8) . The nucleator was mixed with the composition of Inventive Example 3 to produce Inventive Example 21, and hinged caps were produced in the injection molding process. The hinges of these covers were tested using the hinge durability tester. Each hinge was tested until failure occurred or until 1,000 cycles had been reached, whichever came first. Inventive Example 21 showed greater durability of the hinge, demonstrating that the nucleation of HDPE with HHPA improves the durability of the hinge.
    [0045] Table 8

    [0046] To better understand the molecular architecture that generates the improvement in the durability of the hinge, Gel Permeation Chromatography (GPC) was used. Table 9 contains a summary of GPC results with the corresponding hinge durability performance.
    [0047] Molecular Weight (MW) and Molecular Weight Distribution (MWD) Determination by HT GPC
    [0048] A high temperature Gel Permeation Chromatography system from PolymerChar (Valencia, Spain) consisting of an Infrared concentration / composition detector (IR-5), a PDI 2040 laser light scatter (Precision Detector, now Agilent ) and a viscometer with four capillary bridges (Viscotek, now Malvern) was used to determine MW and MWD. The carrier solvent was 1,2,4-trichlorobenzene (TCB). The solvent delivery pump, online solvent degasser, autosampler and column oven were from Agilent. The autosampler and detector compartments were operated at 160 ° C, and the column compartment was operated at 150 ° C. The columns were four PLgel Olexis, 13 micron columns (Agilent). The chromatographic solvent and the sample preparation solvent contained 250 ppm of butylated hydroxytoluene (BHT) and both solvent sources were sprayed with nitrogen. Polyethylene samples were prepared semi-automatically at target concentrations of 2 mg / mL by weighing the samples using a computer-controlled scale and delivering the calculated amount of solvent through the self-sampler. The samples were dissolved at 160 ° C for 3 hours with gentle agitation. The injection volume was 200 μl, and the flow rate was 1.0 mL / minute.
    [0049] The calibration of the GPC column set was performed with 21 polystyrene standards with narrow molecular weight distribution. The molecular weights of the standards ranged from 580 to 8,400,000 g / mol, and were arranged in 6 “cocktail” mixtures, with at least a decade of separation between the individual molecular weights. The peak molecular weights of the polystyrene standard were converted to molecular weights of polyethylene using the following equation (as described by Williams and Ward, J. Polym. Sci., Polym. Let., 6, 621 (1968)):
    Here, B has a value of 1.0, and the value of A determined experimentally is approximately 0.38. A fifth order polynomial was used to adjust the respective calibration points equivalent to the polyethylene obtained from equation (1) for their observed elution volumes for each polystyrene standard. The average numerical, average weight and average zeta molecular weights were calculated according to the following equations:
    Where, WfI is the weight fraction of the i-th component and MI is the molecular weight of the i-th component.
    [0050] MWD was expressed as the proportion of the average molecular weight (Mw) by weight in relation to the average numerical molecular weight (Mn). The exact value of A was determined by adjusting the value of A in equation (1) to Mw, the average molecular weight calculated using equation (3) and the corresponding retention volume polynomial, agreed with the independently determined value of Mw obtained according to the reference of the linear homopolymer with average molecular weight of 115,000 g / mol.
    [0051] In the case of Inventive Example 5, the hinge durability test was suitable for more than 200 cycles, but this composition does not exhibit the processing conditions that are as favorable as the Inventive Examples comprising both the first and the second components of the HDPE. Notably, Comparative Example 6 shows unacceptable hinge durability. A comparison of all Inventive Examples with Comparative Example 6 shows that an increase in Mz and Mz / Mw is desirable for good hinge performance. Thus, it is desirable to have an Mz of 200,000 or greater for good hinge durability, preferably 250,000 or greater.
    [0052] The resins used in the present examples have an Mw of 40,000 g / mol or greater. It is desirable to have an Mw of less than 70,000 g / mol, and more preferably less than 65,000 for favorable processing / molding characteristics.
    [0053] Table 9


    [0054] The capillary rheology of a set of Inventive Examples is shown in Figure 2, measured at 190 ° C. At a shear rate of 200 / s a viscosity between 150 to 250 Pa-s is desirable to obtain desired processing characteristics for the injection-molded hinge. At a shear rate of 8,000 / s, a viscosity of 25-40 Pa-s is desirable to obtain the desired processing characteristics for the injection-molded hinge.
    [0055] Capillary viscosity was measured at 190 ° C in a Rosand RH 2000 equipped with a flat inlet matrix (180 degrees) of 16 mm in length and 1 mm in diameter with apparent shear rates ranging from 160 to 6300 s- 1. Rabinowitsch's correction is applied to explain the shear thinning effect.
    [0056] Fig. 2 is a graph of values resulting from corrected viscosity as a function of the corrected shear rate for the comparative and inventive examples described above.
    [0057] Articulated Components
    [0058] An articulated component is defined as consisting of multiple bodies connected by a thinner continuous, partial or segmented section that acts as a support point allowing one or more bodies to bend from the molded position. In line with the Wiley Encyclopedia of Packaging Technology (2nd Edition), the articulated upper component that is used as a lid consists of a dispensing hole embedded in a thread, fitting, or integrated into the component base and can be implemented in a variety of ways shapes.
    [0059] Useful hinge designs include, but are not limited to, a single strip, double strip, multiple strips, and butterfly-like designs, such as those illustrated in figures 1-8.
    [0060] Figs. 3, 4 and 5, are detailed perspective views of partial double-hinged hinge covers.
    [0061] Figs. 6, 7 and 8 are detailed views of the top plan of a configuration of a butterfly hinge design of a cover.
    [0062] Fig. 9 is a top plan view of an eccentric cover configuration hinged in the center with a built-in double strip hinge.
    [0063] Fig. 10 is a cross-sectional view of Figure 9 taken along line A-A.
    [0064] Fig. 11 is a detailed cross-sectional elevation view of a configuration of an impartial portion of a cover hinge.
    [0065] Fig. 12 is a perspective view of an application of a hinged lid incorporated in an open configuration without an inclination element.
    [0066] Fig. 13 is a perspective view of a hinge cover configuration incorporated in an open configuration without an inclination element.
    [0067] Many configurations of the hinged lid can be formed from the inventive HDPE composition (s) by means of various molding techniques known in the art such as, but not limited to, compression molding, molding by injection, a combination of them and similar techniques. This method for preparing a hinge containing HDPE includes in a preferred configuration the steps of: (a) providing a molding unit in which it has a mold cavity and a mold half having a mold core; (b) introducing a composition to be molded into a hinge component comprising at least the first HDPE resin in the molding unit; (c) closing the molding unit; (d) allowing the introduced composition to be kept in the molding unit until the end of a molding cycle; and (e) opening the molding unit and removing the mold core cover.
    [0068] Another preferred configuration can advantageously be formed using an injection molding unit having half a mold with a mold cavity and a half mold having a mold core, according to processes known in the art and generally described in Plastic Injection Molding, Volume 1-Manufacturing Process Fundamentals, by Douglas M. Bryce. Specifically, in the injection molding process, the molding component is fed into an extruder via a chute. The extruder conveys, heats, melts and pressurizes the molding compound to form a melted flow. The molten flow is forced out of the extruder through a nozzle into a cold mold kept closed under pressure, thereby filling the mold. The melted material cools and hardens until it is fully established. Then, the mold opens and the molded part is removed. The component is molded using bar temperatures between 160 ° C and 300 ° C, preferably between 190 ° C and 260 ° C and more preferably between 200 ° C and 240 ° C.
    [0069] The resulting hinge component has a thickness where the minimum thickness of the hinge portion is in the range of approximately 0.001 to 0.50 inches (0.00254 cm to 1.27 cm), preferably around 0.005 to 0.025 inches (0.0127 cm to 0.0635 cm), and more preferably around 0.01 to 0.014 inches (0.0254 cm to 0.03556 cm). The hinge component of the invention has a ratio of the minimum thickness of the hinge portion to a maximum thickness of the hinged component that is less than or equal to 0.9 inches (2.286 cm), preferably less than or equal to 0.5 inches (1, 27 cm), and more preferably less than or equal to 0.3.
    权利要求:
    Claims (12)
    [0001]
    1. LIVE ARTICULATED COMPONENT characterized by the fact that it comprises a first high density polyethylene (HDPE) resin with the following characteristics: a. Fusion index from 0.5 dg / min to 10 dg / min, b. Density from 0.940 g / cm3 to 0.968 g / cm3, and c. Flow Rate of Molten Material greater than 25, in which density measurements were made in accordance with ASTM D795; where the melt index measurements were made according to ASTM D1238 at a temperature of 190 ° C and with a load of 2.16 kg; and wherein the molten material flow ratio is defined as the ratio of the flow index divided by the melt index; and a second HDPE resin, which is different from the first HDPE resin, having a melt flow rate of less than 30.
    [0002]
    2. ARTICULATED COMPONENT according to claim 1, characterized by the fact that the first HDPE resin has a melt flow ratio greater than 50
    [0003]
    3. ARTICULATED COMPONENT according to claim 1, characterized by the fact that the first HDPE resin has an Mz greater than 200,000 as determined by Gel Permeation Chromatography (GPC).
    [0004]
    4. ARTICULATED COMPONENT according to claim 1, characterized by the fact that the first HDPE resin comprises from 10% to 90% by weight of the composition for the manufacture of a molded hinge component.
    [0005]
    5. ARTICULATED COMPONENT according to claim 1, characterized by the fact that it also comprises one or more additives selected from the group consisting of polymer processing adjuvants (ppa), sliding components, nucleators, antistatic additives and organic additives or inorganic performance enhancers or combination thereof.
    [0006]
    6. ARTICULATED COMPONENT according to claim 11, characterized by the fact that it also comprises an HHPA nucleator, it is a hexahydrophthalic acid (HHPA) metal salt.
    [0007]
    7. ARTICULATED COMPONENT according to claim 1, characterized by the fact that it maintains its integrity after 200 closings in a hinge durability test as described in this document.
    [0008]
    8. ARTICULATED COMPONENT according to claim 1, characterized by the fact that the component is injection molded.
    [0009]
    9. ARTICULATED COMPONENT according to claim 15, characterized in that the hinge portion has a minimum thickness of the hinge portion from 0.001 to 0.5 inches (0.00254 to 1.27 cm).
    [0010]
    10. ARTICULATED COMPONENT according to claim 15, characterized by the fact that the ratio of the minimum thickness of the hinge portion to the maximum thickness of the articulated component is less than or equal to 0.9 inches (2.286 cm).
    [0011]
    11. METHOD FOR PREPARING A HDPE containing an articulated component characterized by the fact that it comprises the steps of: (a) providing a molding unit that has a mold cavity and a mold half that has a mold core; (b) introducing a composition to be molded into a hinge component comprising the first HDPE resin in the molding unit, with the following characteristics: Melt Index (I2.16 at 190 ° C) from 0.5 dg / min to 10 dg / min, Density from 0.940 g / cm3 to 0.968 g / cm3, and Melt Flow Rate (at 190 ° C) greater than 25, where density measurements were made according to ASTM D792; the melt index measurements were made according to ASTM D1238 at a temperature of 190 ° C and with a load of 2.16 kg and the melt index measurements were made at a temperature of 190 ° C and with a load of 21.6 kg; and wherein the molten material flow ratio is defined as the ratio of the flow index divided by the melt index; and a second high density polyethylene (HDPE) resin, which is different from the first HDPE resin having a melt flow rate of less than 30; (c) closing the molding unit; (d) allowing the introduced composition to be kept in the molding unit until the end of a molding cycle; and (e) opening the molding unit and removing the mold core cover.
    [0012]
    12. METHOD FOR PREPARING A HDPE containing an articulated component characterized by the fact that it comprises the steps of: (a) providing a device that has a molding unit, said molding unit comprising a mold half having a mold cavity and a mold half having a mold core; (b) closing the molding unit; (c) introducing a composition to be molded into a hinge component comprising the first HDPE resin in the molding unit, with the following characteristics: Melt Index (I2.16 at 190 ° C) from 0.5 dg / min to 10 dg / min, Density from 0.940 g / cm3 to 0.968 g / cm3, and Melt Flow Rate (at 190 ° C) greater than 25; where density measurements were made according to ASTM D792; the melt index measurements were made according to ASTM D1238 at a temperature of 190 ° C and with a load of 2.16 kg and the melt index measurements were made at a temperature of 190 ° C and with a load of 21.6 kg; and wherein the molten material flow ratio is defined as the ratio of the flow index divided by the melt index; and a second high density polyethylene (HDPE) resin, which is different from the first HDPE resin having a melt flow rate of less than 30; (d) allowing the introduced composition to be kept in the molding unit until the end of a molding cycle; and (e) opening the molding unit and removing the mold core cover.
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    法律状态:
    2018-03-27| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2018-04-10| B25A| Requested transfer of rights approved|Owner name: DOW GLOBAL TECHNOLOGIES LLC (US) , UNILEVER NV (NL) Owner name: DOW GLOBAL TECHNOLOGIES LLC (US) , UNILEVER NV (NL |
    2020-04-22| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-12-08| B09A| Decision: intention to grant|
    2021-01-26| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 10/06/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201261658184P| true| 2012-06-11|2012-06-11|
    US61/658,184|2012-06-11|
    PCT/US2013/045005|WO2013188304A1|2012-06-11|2013-06-10|High density polyethylene composition and closure|
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