WO2022215428A1 - 樹脂組成物及び成形品 - Google Patents
樹脂組成物及び成形品 Download PDFInfo
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- WO2022215428A1 WO2022215428A1 PCT/JP2022/010558 JP2022010558W WO2022215428A1 WO 2022215428 A1 WO2022215428 A1 WO 2022215428A1 JP 2022010558 W JP2022010558 W JP 2022010558W WO 2022215428 A1 WO2022215428 A1 WO 2022215428A1
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- 239000006028 limestone Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 238000010299 mechanically pulverizing process Methods 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- RQFLGKYCYMMRMC-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O.CCCCCCCCCCCCCCCCCC(O)=O RQFLGKYCYMMRMC-UHFFFAOYSA-N 0.000 description 1
- BCCOBQSFUDVTJQ-UHFFFAOYSA-N octafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(F)C1(F)F BCCOBQSFUDVTJQ-UHFFFAOYSA-N 0.000 description 1
- 235000019407 octafluorocyclobutane Nutrition 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- GTLACDSXYULKMZ-UHFFFAOYSA-N pentafluoroethane Chemical compound FC(F)C(F)(F)F GTLACDSXYULKMZ-UHFFFAOYSA-N 0.000 description 1
- DGBWPZSGHAXYGK-UHFFFAOYSA-N perinone Chemical compound C12=NC3=CC=CC=C3N2C(=O)C2=CC=C3C4=C2C1=CC=C4C(=O)N1C2=CC=CC=C2N=C13 DGBWPZSGHAXYGK-UHFFFAOYSA-N 0.000 description 1
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- IZMJMCDDWKSTTK-UHFFFAOYSA-N quinoline yellow Chemical compound C1=CC=CC2=NC(C3C(C4=CC=CC=C4C3=O)=O)=CC=C21 IZMJMCDDWKSTTK-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 229940037312 stearamide Drugs 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
- WEAPVABOECTMGR-UHFFFAOYSA-N triethyl 2-acetyloxypropane-1,2,3-tricarboxylate Chemical compound CCOC(=O)CC(C(=O)OCC)(OC(C)=O)CC(=O)OCC WEAPVABOECTMGR-UHFFFAOYSA-N 0.000 description 1
- 239000001069 triethyl citrate Substances 0.000 description 1
- VMYFZRTXGLUXMZ-UHFFFAOYSA-N triethyl citrate Natural products CCOC(=O)C(O)(C(=O)OCC)C(=O)OCC VMYFZRTXGLUXMZ-UHFFFAOYSA-N 0.000 description 1
- 235000013769 triethyl citrate Nutrition 0.000 description 1
- 235000013799 ultramarine blue Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Definitions
- the present invention relates to resin compositions and molded articles.
- polyethylene resin Due to its excellent mechanical properties, polyethylene resin is widely used as a material for molded products.
- Patent Documents 1 and 2 it has been proposed to blend inorganic substance powders and various additives with polyethylene-based resins.
- the present inventor believes that the resin composition containing the various components as described above can impart the intended properties to the polyethylene resin, but may impair the moldability. found that there is If the moldability of the resin composition is low, the appearance of the resulting molded product may also be impaired.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin composition in which deterioration of moldability is suppressed.
- the present inventors have found that the above problems can be solved by blending predetermined amounts of inorganic substance powder, zinc stearate, and stearic acid together with polyethylene resin, and have completed the present invention. More specifically, the present invention provides:
- a resin composition Containing polyethylene resin, inorganic substance powder, zinc stearate, and stearic acid,
- the mass ratio of the polyethylene resin and the inorganic substance powder is 10:90 to 90:10
- the content of the zinc stearate is 0.05% by mass or more and 0.60% by mass or less with respect to the resin composition
- the stearic acid content is 0.10% by mass or more and 1.20% by mass or less with respect to the resin composition
- the mass ratio of the zinc stearate and the stearic acid is 1:1.5 to 1:4.
- Resin composition Containing polyethylene resin, inorganic substance powder, zinc stearate, and stearic acid
- the polyethylene resin is A high-density polyethylene having an MFR (190° C., 21.6 kg) according to JIS K 6922-1 (ISO1133) of 5 g/10 minutes or more and 15 g/10 minutes or less; JIS K 6922-1 (ISO1133) MFR (190 ° C., 2.16 kg) is 0.5 g / 10 minutes or more and 1.5 g / 10 minutes or less linear low density polyethylene, The mass ratio of the high-density polyethylene and the linear low-density polyethylene is 92.5:7.5 to 99.5:0.5, The resin composition according to (1).
- the present invention also includes the following inventions.
- a resin composition Containing polyethylene resin, inorganic powder, zinc stearate, stearic acid, and polyethylene wax,
- the mass ratio of the polyethylene resin and the inorganic substance powder is 10:90 to 90:10
- the content of the zinc stearate is 0.05% by mass or more and 0.60% by mass or less with respect to the resin composition
- the stearic acid content is 0.10% by mass or more and 1.20% by mass or less with respect to the resin composition
- the mass ratio of the zinc stearate and the stearic acid is 1:2.2 to 1:4,
- the content of the polyethylene wax is 0.15% by mass or more and 1.80% by mass or less with respect to the resin composition.
- the polyethylene-based resin is A high-density polyethylene having an MFR (190° C., 21.6 kg) according to JIS K 6922-1 (ISO1133) of 5 g/10 minutes or more and 15 g/10 minutes or less; JIS K 6922-1 (ISO1133) MFR (190 ° C., 2.16 kg) is 0.5 g / 10 minutes or more and 1.5 g / 10 minutes or less linear low density polyethylene, The mass ratio of the high-density polyethylene and the linear low-density polyethylene is 92.5:7.5 to 99.5:0.5, The resin composition according to ⁇ 1>.
- ⁇ 5> A molded article obtained from the resin composition according to any one of ⁇ 1> to ⁇ 4>.
- a resin composition is provided in which deterioration of moldability is suppressed.
- the resin composition of the present invention contains polyethylene resin, inorganic powder, zinc stearate, and stearic acid, and satisfies all of the following requirements.
- the content of zinc stearate is 0.05% by mass or more and 0.60% by mass or less with respect to the resin composition.
- the content of stearic acid is 0.10% by mass or more and 1.20% by mass or less with respect to the resin composition.
- inorganic substance powder such as calcium carbonate
- inorganic substance powder should be blended into polyethylene-based resin so as to satisfy (Requirement 1). is conventionally known.
- Zinc stearate is known to act as a lubricant.
- Stearic acid is also known to act as a dispersant.
- lubricants and dispersants were blended together with the polyethylene resin, it was not possible to confirm the same effect as the combination of zinc stearate and stearic acid.
- zinc stearate and stearic acid are combined, it is difficult to obtain sufficient effects unless (requirements 2) to (requirements 4) are satisfied.
- the present inventors have found that such an effect of suppressing deterioration of molding processability is obtained when the polyethylene resin is a mixture of high-density polyethylene and linear low-density polyethylene, or when polyethylene wax is further blended. We have also found that it can be improved.
- the term "moldability" means ease of processing when the resin composition is molded by any molding method.
- moldability in the case of inflation molding a resin composition includes ease of blowing.
- moldability in the case of extruding a resin composition includes ease of extrusion from a die.
- the present invention as a result of being able to suppress deterioration in moldability of the resin composition, it is also possible to suppress deterioration in the appearance of the resulting molded product.
- the appearance of the molded product can be evaluated by visually observing the surface condition (smoothness, etc.) of the molded product, for example.
- polyethylene resin The polyethylene-based resin in the present invention is not particularly limited as long as it contains at least a portion of methylene repeating units.
- the polyethylene-based resin in the present invention includes resins containing 50% by mass or more of ethylene component units.
- Polyethylene-based resins may be used singly or in combination of two or more.
- the origin of the polyethylene-based resin is not particularly limited, and it may be synthesized or manufactured from plant-derived raw materials.
- polyethylene-based resins include the following. High density polyethylene (HDPE): polyethylene having a density of 0.942 g/cm 3 or more Medium density polyethylene: polyethylene having a density of 0.930 g/cm 3 or more and less than 0.942 g/cm 3 Low density polyethylene (LDPE): 0 Polyethylene having a density of 0.910 g/cm 3 or more and less than 0.930 g/cm 3 Linear low-density polyethylene (LLDPE): Linear low-density polyethylene (LLDPE) having a density of 0.911 g/cm 3 or more and less than 0.940 g/cm 3 Polyethylene Ultra Low Density Polyethylene (ULDPE): Polyethylene with a density of less than 0.910 g/ cm3
- the polyethylene resin in the present invention is a functional group-containing polyethylene resin (ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, metal salt of ethylene-methacrylic acid copolymer ( ionomers), ethylene-alkyl acrylate copolymers, ethylene-alkyl methacrylate copolymers, maleic acid-modified polyethylene, etc.).
- ethylene-vinyl acetate copolymer ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, metal salt of ethylene-methacrylic acid copolymer ( ionomers), ethylene-alkyl acrylate copolymers, ethylene-alkyl methacrylate copolymers, maleic acid-modified polyethylene, etc.
- the polyethylene-based resin preferably contains either or both of the following, and more preferably contains both.
- MFR is an abbreviation for "melt mass flow rate”.
- High-density polyethylene having an MFR (190°C, 21.6 kg) according to JIS K 6922-1 (ISO1133) of 5 g/10 minutes or more and 15 g/10 minutes or less 16 kg) is 0.5 g/10 min or more and 1.5 g/10 min or less of linear low density polyethylene
- the resin composition of the present invention contains both high-density polyethylene and linear low-density polyethylene that satisfy the above MFR, their mass ratio (high-density polyethylene: linear low-density polyethylene) is preferably 92.5:7.5 to 99.5:0.5, more preferably 94.0:6.0 to 98.0:2.0.
- the inorganic substance powder in the present invention includes any component that can be blended with the resin, and for example, what is known as a filler can be preferably used.
- the inorganic substance powder may be used singly or in combination of two or more.
- Inorganic substance powders include those that are synthesized as well as those derived from natural minerals (pulverized materials such as minerals).
- inorganic substance powders examples include salts (carbonates, sulfates, silicates, phosphates, borates), oxides, and hydrated metals (calcium, magnesium, aluminum, titanium, iron, zinc, etc.). powders of substances.
- the shape of the inorganic substance powder is not particularly limited, but may be particulate (spherical, irregular, etc.), flake, granular, fibrous, or the like.
- the lower limit of the particle size of the inorganic substance powder is not particularly limited, but the average particle size is preferably 0.7 ⁇ m or more, more preferably 1.0 ⁇ m or more.
- the upper limit of the particle size of the inorganic substance powder is not particularly limited, but the average particle size is preferably 6.0 ⁇ m or less, more preferably 5.0 ⁇ m or less.
- the "average particle size” means a value calculated from the measurement results of the specific surface area by the air permeation method according to JIS M-8511.
- a specific surface area measuring device “SS-100 type” manufactured by Shimadzu Corporation can be preferably used.
- the inorganic substance powder in the present invention preferably contains heavy calcium carbonate, and more preferably consists of heavy calcium carbonate.
- Heavy calcium carbonate contains particles with a wide range of particle sizes, and is generally known to be poor in moldability. However, according to the present invention, even a resin composition containing heavy calcium carbonate has good moldability, and the appearance of molded articles can be excellent.
- Heavy calcium carbonate can be obtained, for example, by crushing and classifying natural calcium carbonate such as calcite (limestone, chalk, marble, etc.), shells, and corals.
- pulverization method in the method for producing heavy calcium carbonate either wet pulverization or dry pulverization can be adopted. Dry pulverization, which does not require a dehydration step, a drying step, or the like, is preferable from an economical point of view.
- the pulverizer used for pulverizing heavy calcium carbonate is not particularly limited, and examples include impact pulverizers, pulverizers using pulverizing media (ball mills, etc.), and roller mills.
- the ground calcium carbonate may or may not be surface-treated.
- the surface treatment can be performed at any time (before pulverization, during pulverization, before classification, after classification, etc.) in the method for producing heavy calcium carbonate.
- the surface treatment of heavy calcium carbonate includes physical methods (plasma treatment, etc.) and chemical methods (methods using coupling agents, surfactants, etc.).
- coupling agents used in chemical methods include, for example, silane coupling agents and titanium coupling agents.
- surfactants used in chemical methods include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. More specific examples include higher fatty acids, higher fatty acid esters, higher fatty acid amides, and higher fatty acid salts.
- heavy calcium carbonate that has not been subjected to surface treatment is preferable in that it can reduce the risk of odor generation due to thermal decomposition of the surface treatment agent during molding.
- ground calcium carbonate is not particularly limited, but from the viewpoint of good dispersibility in the resin composition, it is preferably particulate.
- the ground calcium carbonate When the ground calcium carbonate is particulate, its average particle size is preferably 0.7 ⁇ m or more and 6.0 ⁇ m or less, more preferably 1.0 ⁇ m or more and 5.0 ⁇ m or less, still more preferably 1.5 ⁇ m or more and 3.0 ⁇ m. It is below.
- the average particle size of the heavy calcium carbonate is within the above range, the dispersibility in the resin composition is good, and an excessive increase in viscosity of the resin composition can be prevented. Furthermore, the heavy calcium carbonate particles are less likely to protrude from the surface of the molded product obtained from the resin composition and fall off, or the surface properties, mechanical strength, etc. are less likely to be impaired, and the effects of the present invention are more likely to be achieved.
- the heavy calcium carbonate is particulate, it is preferable that particles with a particle diameter of 45 ⁇ m or more are not included in the particle size distribution.
- ground calcium carbonate When ground calcium carbonate is particulate, its irregularity can be represented by the degree of spheroidization of the shape, ie, the degree of circularity. A lower roundness means a higher irregularity.
- the ground calcium carbonate When the ground calcium carbonate is particulate, its circularity is preferably 0.50 or more and 0.95 or less, more preferably 0.55 or more and 0.93 or less, and still more preferably 0.60 or more and 0.90. It is below.
- roundness refers to a value obtained by dividing the projected area of a particle by the area of a circle having the same perimeter as the projected perimeter of the particle ((projected area of the particle)/(projected perimeter of the particle). means the area of a circle with the same perimeter)).
- the method of measuring the roundness is not particularly limited, but for example, the roundness can be specified by analyzing a projected image of particles obtained with a scanning microscope, a stereomicroscope, or the like, using commercially available image analysis software.
- the projected area of the particle (A), the area of the circle having the same perimeter as the projected perimeter of the particle (B), the radius of the circle having the same perimeter as the projected perimeter of the particle (r), the particle can be calculated by the following formula based on the measurement results of the projection perimeter (PM) of the .
- Zinc stearate and stearic acid Zinc stearate and stearic acid
- Zinc stearate and stearic acid can be incorporated into the resin composition so as to satisfy the requirements of the present invention. etc. are not particularly limited.
- composition of resin composition The composition of the resin composition of the present invention is not particularly limited as long as it satisfies all of the following four requirements.
- the content of zinc stearate is 0.05% by mass or more and 0.60% by mass or less with respect to the resin composition.
- the content of stearic acid is 0.10% by mass or more and 1.20% by mass or less with respect to the resin composition.
- the mass ratio of the polyethylene-based resin and the inorganic substance powder is preferably 30:70 to 80:20, more preferably 50. : 50 to 70:30.
- the upper limit of the polyethylene-based resin content is preferably 80% by mass or less, more preferably 70% by mass or less, relative to the resin composition.
- the lower limit of the polyethylene-based resin content is preferably 30% by mass or more, more preferably 50% by mass or more, relative to the resin composition.
- the upper limit of the content of the inorganic substance powder is preferably 70% by mass or less, more preferably 50% by mass or less, relative to the resin composition.
- the lower limit of the content of the inorganic substance powder is preferably 20% by mass or more, more preferably 30% by mass or more, relative to the resin composition.
- the lower limit of the content of zinc stearate is preferably 0.10% by mass or more, more preferably 0.15% by mass or more, relative to the resin composition.
- the upper limit of the content of zinc stearate is preferably 0.55% by mass or less, more preferably 0.50% by mass or less, relative to the resin composition.
- the lower limit of the content of stearic acid is preferably 0.15% by mass or more, more preferably 0.20% by mass or more, relative to the resin composition.
- the upper limit of the content of stearic acid is preferably 1.15% by mass or less, more preferably 1.10% by mass or less, relative to the resin composition.
- the mass ratio of zinc stearate to stearic acid is preferably 1:2.2 to 1:4, preferably 1: 2 to 1:3.5, preferably 1:2.2 to 1:3.5, more preferably 1:2.2 to 1:3.3.
- the resin composition of the present invention may further contain optional components within a range that does not impair the effects of the present invention.
- optional components can be used singly or in combination of two or more. Further, the type and blending amount of such components can be appropriately set according to the effect to be obtained.
- Components that can be contained in the resin composition of the present invention include lubricants (other than zinc stearate), dispersants (other than stearic acid), plasticizers, resins other than polyethylene resins, coloring agents, antioxidants, flame retardants, A foaming agent etc. are mentioned.
- any lubricating agent that can be incorporated into the resin composition can be used, and examples thereof include polyethylene wax (polyethylene wax, etc.), paraffin wax, sorbitan ester, glycerin ester, magnesium stearate, stearamide, and the like.
- polyethylene-based waxes particularly tend to enhance the effects of the present invention due to zinc stearate and stearic acid.
- the lower limit of the polyethylene wax content is preferably 0.15% by mass or more, more preferably 0.20% by mass or more, relative to the resin composition.
- the upper limit of the polyethylene wax content is preferably 1.80% by mass or less, more preferably 1.50% by mass or less, relative to the resin composition.
- Dispersants include sodium polyacrylate, polyglycerin fatty acid ester, sorbitan fatty acid ester, and the like.
- plasticizer examples include acetyltributyl citrate, triethyl citrate, acetyltriethyl citrate, dibutyl phthalate, diaryl phthalate, dimethyl phthalate, diethyl phthalate, di-2-methoxyethyl phthalate, dibutyl tartrate, o -benzoyl benzoic acid ester, diacetin, epoxidized soybean oil and the like.
- resins other than polyethylene-based resins As resins other than polyethylene resins, Polyolefin resins such as polypropylene resins, polymethyl-1-pentene, and ethylene-cyclic olefin copolymers; Polyamide resins such as nylon-6, nylon-6,6, nylon-6,10, nylon-6,12; Aromatic polyester resins such as polyethylene terephthalate and its copolymers, polyethylene naphthalate, and polybutylene terephthalate; Polystyrene resins such as atactic polystyrene, syndiotactic polystyrene, acrylonitrile-styrene (AS) copolymer, acrylonitrile-butadiene-styrene (ABS) copolymer; Polyvinyl chloride resins such as polyvinyl chloride and polyvinylidene chloride; polyphenylene sulfide; Polyether-based resins such as polyether sulfone
- the resin composition of the present invention does not contain a resin other than a polyethylene resin, or even if it contains a small amount (for example, 1.0 mass with respect to the resin composition % or less).
- organic pigments include azo-based, anthraquinone-based, phthalocyanine-based, quinacridone-based, isoindolinone-based, diosazine-based, perinone-based, quinophthalone-based, and perylene-based pigments.
- inorganic pigments include ultramarine blue, titanium oxide, titanium yellow, iron oxide (rouge), chromium oxide, zinc white, and carbon black.
- antioxidants examples include phosphorus antioxidants, phenolic antioxidants, and pentaerythritol antioxidants.
- flame retardants include halogen-based flame retardants, phosphorus-based flame retardants, and non-phosphorus-based non-halogen flame retardants such as metal hydrates.
- blowing agents include aliphatic hydrocarbons (propane, butane, pentane, hexane, heptane, etc.), alicyclic hydrocarbons (cyclobutane, cyclopentane, cyclohexane, etc.), halogenated hydrocarbons (chlorodifluoromethane , difluoromethane, trifluoromethane, trichlorofluoromethane, dichloromethane, dichlorofluoromethane, dichlorodifluoromethane, chloromethane, chloroethane, dichlorotrifluoroethane, dichloropentafluoroethane, tetrafluoroethane, difluoroethane, pentafluoroethane, trifluoroethane, dichloro tetrafluoroethane, trichlorotrifluoroethane, tetrachlorodifluoro
- the resin composition of the present invention can be produced by using the components described above and according to a conventionally known method for producing a resin composition.
- the resin composition is obtained, for example, through mixing of components, melt-kneading, and the like.
- the timing of mixing and melt-kneading can be appropriately set according to the molding method to be adopted (extrusion molding, injection molding, vacuum molding, etc.). For example, mixing may be performed before charging from the hopper of the molding machine or at the same time as molding.
- Melt-kneading may be performed by, for example, a twin-screw kneader or the like.
- the resin composition of the present invention may be in any form as long as it can be molded.
- the form of the resin composition of the present invention can be, for example, pellets of any size and shape.
- the shape of the pellet is not particularly limited, and may be, for example, cylindrical, spherical, or oval.
- the size of the pellet is not particularly limited.
- spherical pellets may be 1-10 mm in diameter.
- the aspect ratio can be 0.1 to 1.0 and the length and width can be 1 to 10 mm.
- cylindrical pellets they can be 1-10 mm in diameter and 1-10 mm in length.
- a desired molded product can be obtained by molding after drying the resin composition of the present invention as necessary.
- the molded article of the present invention can be obtained by molding the resin composition of the present invention by any molding method.
- the molded article of the present invention may have any shape according to its use.
- the molded article of the present invention includes, for example, films, sheets, containers (food containers, etc.), daily necessities (various disposable products, etc.), automotive parts, electrical and electronic parts, various consumables (such as those in the field of construction materials, etc.). etc.
- the resin composition of the present invention has good moldability, it is particularly suitable for inflation molding or extrusion molding. Accordingly, the molded article of the present invention is preferably a blown or extruded article.
- inflation-molded products examples include films, sheets, and bags (such as plastic shopping bags).
- the thickness of the inflation molded product is not particularly limited, but is preferably 10 ⁇ m to 200 ⁇ m, more preferably 30 ⁇ m to 100 ⁇ m.
- Extruded products include films, sheets, and hollow products.
- the method for producing the molded article of the present invention can be appropriately selected according to the molded article to be obtained.
- Examples of methods for producing the molded article of the present invention include inflation molding, extrusion molding, injection molding, foam injection molding, injection compression molding, blow molding, press molding, calendar molding, and vacuum molding. etc.
- the molding conditions can be appropriately set according to the composition of the resin composition, the type of molded product, etc.
- the molded product When the molded product is a film, sheet, or the like, it may or may not be stretched uniaxially, biaxially, or multiaxially during or after molding.
- lubricant dispersant
- Zn stearate: stearic acid means the mass ratio of zinc stearate and stearic acid lubricant contained in the resin composition.
- the "average particle size” is a value calculated from the measurement results of the specific surface area by the air permeation method according to JIS M-8511 using a specific surface area measuring device "SS-100 type” manufactured by Shimadzu Corporation. is.
- the high-density polyethylene has an MFR (190° C., 21.6 kg) of 10 g/10 minutes according to JIS K 6922-1 (ISO 1133).
- the linear low-density polyethylene has an MFR (190° C., 2.16 kg) of 1.0 g/10 minutes according to JIS K 6922-1 (ISO1133).
- the molded articles obtained from the resin compositions satisfying the requirements of the present invention were excellent in both moldability and appearance. Such an effect tends to be exhibited more easily when a mixture of high-density polyethylene and linear low-density polyethylene is used as the polyethylene-based resin.
- the molded article obtained from the resin composition that satisfies the requirements of the present invention also had good mechanical properties (tensile strength, elongation, etc.).
- a molded article obtained from a resin composition that does not contain either or both of zinc stearate and stearic acid, or a resin composition whose blending ratio does not satisfy the requirements of the present invention has poor moldability. and either or both of the appearance of the molded article was inferior.
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Abstract
Description
ポリエチレン系樹脂と、無機物質粉末と、ステアリン酸亜鉛と、ステアリン酸とを含み、
前記ポリエチレン系樹脂と前記無機物質粉末との質量比が、10:90~90:10であり、
前記ステアリン酸亜鉛の含有量が、前記樹脂組成物に対して0.05質量%以上0.60質量%以下であり、
前記ステアリン酸の含有量が、前記樹脂組成物に対して0.10質量%以上1.20質量%以下であり、
前記ステアリン酸亜鉛と前記ステアリン酸との質量比が、1:1.5~1:4である、
樹脂組成物。
JIS K 6922-1(ISO1133)によるMFR(190℃、21.6kg)が5g/10分以上15g/10分以下である高密度ポリエチレンと、
JIS K 6922-1(ISO1133)によるMFR(190℃、2.16kg)が0.5g/10分以上1.5g/10分以下である直鎖状低密度ポリエチレンとを含み、
前記高密度ポリエチレンと前記直鎖状低密度ポリエチレンとの質量比が、92.5:7.5~99.5:0.5である、
(1)に記載の樹脂組成物。
ポリエチレン系樹脂と、無機物質粉末と、ステアリン酸亜鉛と、ステアリン酸と、ポリエチレン系ワックスとを含み、
前記ポリエチレン系樹脂と前記無機物質粉末との質量比が、10:90~90:10であり、
前記ステアリン酸亜鉛の含有量が、前記樹脂組成物に対して0.05質量%以上0.60質量%以下であり、
前記ステアリン酸の含有量が、前記樹脂組成物に対して0.10質量%以上1.20質量%以下であり、
前記ステアリン酸亜鉛と前記ステアリン酸との質量比が、1:2.2~1:4であり、
前記ポリエチレン系ワックスの含有量が、前記樹脂組成物に対して0.15質量%以上1.80質量%以下である、
樹脂組成物。
JIS K 6922-1(ISO1133)によるMFR(190℃、21.6kg)が5g/10分以上15g/10分以下である高密度ポリエチレンと、
JIS K 6922-1(ISO1133)によるMFR(190℃、2.16kg)が0.5g/10分以上1.5g/10分以下である直鎖状低密度ポリエチレンとを含み、
前記高密度ポリエチレンと前記直鎖状低密度ポリエチレンとの質量比が、92.5:7.5~99.5:0.5である、
<1>に記載の樹脂組成物。
本発明の樹脂組成物は、ポリエチレン系樹脂と、無機物質粉末と、ステアリン酸亜鉛と、ステアリン酸とを含み、かつ、以下の要件を全て満たす。
(要件1)ポリエチレン系樹脂と無機物質粉末との質量比が、ポリエチレン系樹脂:無機物質粉末=10:90~90:10である。
(要件2)ステアリン酸亜鉛の含有量が、樹脂組成物に対して0.05質量%以上0.60質量%以下である。
(要件3)ステアリン酸の含有量が、樹脂組成物に対して0.10質量%以上1.20質量%以下である。
(要件4)ステアリン酸亜鉛とステアリン酸との質量比が、ステアリン酸亜鉛:ステアリン酸=1:1.5~1:4である。
そこで、本発明者が更に検討した結果、ポリエチレン系樹脂、及び無機物質粉末とともに、(要件2)乃至(要件4)を満たすようにステアリン酸亜鉛、及びステアリン酸(オクタデカン酸)を配合することで、成形加工性の低下を抑制できることを見出した。
しかし、滑剤や分散剤として知られるその他の成分をポリエチレン系樹脂とともに配合しても、ステアリン酸亜鉛、及びステアリン酸の組み合わせほどの効果は確認できなかった。
更に、ステアリン酸亜鉛、及びステアリン酸を組み合わせた場合であっても、(要件2)乃至(要件4)を満たさなければ充分な効果は得られにくかった。
例えば、樹脂組成物をインフレーション成形する場合における成形加工性とは、ブローのし易さを包含する。
例えば、樹脂組成物を押出成形する場合における成形加工性とは、ダイからの押出のし易さを包含する。
成形品の外観は、例えば、成形品の表面の状態(滑らかさ等)を目視観察することで評価できる。
本発明におけるポリエチレン系樹脂は、メチレンの繰り返し単位を少なくとも一部に含む樹脂であれば特に限定されない。
例えば、本発明におけるポリエチレン系樹脂は、エチレン成分単位が50質量%以上である樹脂を包含する。
高密度ポリエチレン(HDPE):0.942g/cm3以上の密度を有するポリエチレン
中密度ポリエチレン:0.930g/cm3以上0.942g/cm3未満の密度を有するポリエチレン
低密度ポリエチレン(LDPE):0.910g/cm3以上0.930g/cm3未満の密度を有するポリエチレン
直鎖状低密度ポリエチレン(LLDPE):0.911g/cm3以上0.940g/cm3未満の密度を有する直鎖状のポリエチレン
超低密度ポリエチレン(ULDPE):0.910g/cm3未満の密度を有するポリエチレン
JIS K 6922-1(ISO1133)によるMFR(190℃、21.6kg)が5g/10分以上15g/10分以下である高密度ポリエチレン
JIS K 6922-1(ISO1133)によるMFR(190℃、2.16kg)が0.5g/10分以上1.5g/10分以下である直鎖状低密度ポリエチレン
本発明における無機物質粉末は、樹脂とともに配合され得る任意の成分を包含し、例えば充填剤として知られるものを好適に使用できる。
具体的には、例えば、炭酸カルシウム、炭酸マグネシウム、酸化亜鉛、酸化チタン、シリカ、アルミナ、クレー、タルク、カオリン、水酸化アルミニウム、水酸化マグネシウム、ケイ酸アルミニウム、ケイ酸マグネシウム、ケイ酸カルシウム、硫酸アルミニウム、硫酸マグネシウム、硫酸カルシウム、リン酸マグネシウム、硫酸バリウム、珪砂、カーボンブラック、ゼオライト、モリブデン、珪藻土、セリサイト、シラス、亜硫酸カルシウム、硫酸ナトリウム、チタン酸カリウム、ベントナイト、ウォラストナイト、ドロマイト、黒鉛等の粉末が挙げられる。
平均粒子径の測定機器としては、例えば、島津製作所社製の比表面積測定装置「SS-100型」を好ましく用いることができる。
本発明における無機物質粉末は、重質炭酸カルシウムを含むことが好ましく、重質炭酸カルシウムからなることがより好ましい。
しかし、本発明によれば、重質炭酸カルシウムを含む樹脂組成物であっても、成形加工性が良好であり、成形品の外観が優れ得る。
ただし、表面処理を施されていない重質炭酸カルシウムは、成形時における表面処理剤の熱分解等による臭気の発生リスクを低減できる点で好ましい。
重質炭酸カルシウムの平均粒子径が上記範囲であると、樹脂組成物中での分散性が良好であり、樹脂組成物の過度な粘度上昇を防ぐことができる。更に、樹脂組成物から得られる成形品表面から重質炭酸カルシウム粒子が突出して脱落したり、表面性状や機械的強度等を損なったりしにくく、本発明の効果をより奏し易くなる。
重質炭酸カルシウムが粒子状である場合、その真円度は、好ましくは0.50以上0.95以下、より好ましくは0.55以上0.93以下、更に好ましくは0.60以上0.90以下である。
真円度の測定方法は特に限定されないが、例えば、走査型顕微鏡や実体顕微鏡等で得られる粒子の投影図を、市販の画像解析ソフトで解析することで特定できる。
具体的には、粒子の投影面積(A)、粒子の投影周囲長と同一周囲長を持つ円の面積(B)、粒子の投影周囲長と同一周囲長を持つ円の半径(r)、粒子の投影周囲長(PM)の測定結果に基づき、下式によって算出できる。
「真円度」=A/B=A/πr2=A×4π/(PM)2
ステアリン酸亜鉛(CAS登録番号:557-05-1)、ステアリン酸(オクタデカン酸、CAS登録番号:57-11-4)は、本発明の要件を満たすように樹脂組成物に配合できれば、その形態等は特に限定されない。
本発明の樹脂組成物の組成は、以下の4つの要件を全て満たす点以外は特に限定されない。
(要件1)ポリエチレン系樹脂と無機物質粉末との質量比が、ポリエチレン系樹脂:無機物質粉末=10:90~90:10である。
(要件2)ステアリン酸亜鉛の含有量が、樹脂組成物に対して0.05質量%以上0.60質量%以下である。
(要件3)ステアリン酸の含有量が、樹脂組成物に対して0.10質量%以上1.20質量%以下である。
(要件4)ステアリン酸亜鉛とステアリン酸との質量比が、ステアリン酸亜鉛:ステアリン酸=1:1.5~1:4である。
本発明の樹脂組成物には、本発明の効果を阻害しない範囲で、上記の成分に加えて、任意の成分が更に含まれ得る。この様な成分は、単独又は2種以上の組み合わせで使用できる。また、この様な成分の種類や配合量は、得ようとする効果等に応じて適宜設定し得る。
滑剤としては、樹脂組成物に配合し得る任意のものを使用でき、例えばポリエチレン系ワックス(ポリエチレンワックス等)、パラフィンワックス、ソルビタンエステル、グリセリンエステル、ステアリン酸マグネシウム、ステアロアミド等が挙げられる。
ポリエチレン系ワックスの含有量の下限は、樹脂組成物に対して、好ましくは0.15質量%以上、より好ましくは0.20質量%以上である。
ポリエチレン系ワックスの含有量の上限は、樹脂組成物に対して、好ましくは1.80質量%以下、より好ましくは1.50質量%以下である。
分散剤としては、ポリアクリル酸ナトリウム、ポリグリセリン脂肪酸エステル、ソルビタン脂肪酸エステル等が挙げられる。
可塑剤としては、例えば、クエン酸アセチルトリブチル、クエン酸トリエチル、クエン酸アセチルトリエチル、フタル酸ジブチル、フタル酸ジアリール、フタル酸ジメチル、フタル酸ジエチル、フタル酸ジ-2-メトキシエチル、酒石酸ジブチル、o-ベンゾイル安息香酸エステル、ジアセチン、エポキシ化大豆油等が挙げられる。
ポリエチレン系樹脂以外の樹脂としては、
ポリプロピレン系樹脂、ポリメチル-1-ペンテン、エチレン-環状オレフィン共重合体等のポリオレフィン系樹脂;
ナイロン-6、ナイロン-6,6、ナイロン-6,10、ナイロン-6,12等のポリアミド系樹脂;
ポリエチレンテレフタレート及びその共重合体、ポリエチレンナフタレート、ポリブチレンテレフタレート等の芳香族ポリエステル系樹脂;
アタクティックポリスチレン、シンジオタクティックポリスチレン、アクリロニトリル-スチレン(AS)共重合体、アクリロニトリル-ブタジエン-スチレン(ABS)共重合体等のポリスチレン系樹脂;
ポリ塩化ビニル、ポリ塩化ビニリデン等のポリ塩化ビニル系樹脂;
ポリフェニレンスルフィド;
ポリエーテルスルフォン、ポリエーテルケトン、ポリエーテルエーテルケトン等のポリエーテル系樹脂等
が挙げられる。
ただし、本発明の効果を奏し易いという観点から、本発明の樹脂組成物には、ポリエチレン系樹脂以外の樹脂を含まないか、含むとしても少量(例えば、樹脂組成物に対して1.0質量%以下)であることが好ましい。
有機顔料としては、アゾ系、アンスラキノン系、フタロシアニン系、キナクリドン系、イソインドリノン系、ジオオサジン系、ペリノン系、キノフタロン系、ペリレン系顔料等が挙げられる。
無機顔料としては、群青、酸化チタン、チタンイエロー、酸化鉄(弁柄)、酸化クロム、亜鉛華、カーボンブラック等が挙げられる。
本発明の樹脂組成物は、上記の成分を用いて、樹脂組成物の製造方法として従来知られる方法に基づき製造できる。
混合や溶融混練のタイミングは、採用しようとする成形方法(押出成形、射出成形、真空成形等)に応じて適宜設定できる。例えば、混合は、成形機のホッパーから投入する前や、成形と同時に行っても良い。
溶融混練は、例えば、二軸混練機等によって行っても良い。
本発明の成形品は、任意の成形方法によって本発明の樹脂組成物を成形することで得られる。
本発明の成形品は、例えば、フィルム、シート、容器体(食品容器等)、日用品(各種使い捨て製品等)、自動車用部品、電気電子部品、各種消耗品(建築部材等の分野におけるもの等)等であり得る。
インフレーション成形品の肉厚は特に限定されないが、好ましくは10μm~200μm、更に好ましくは30μm~100μmである。
本発明の成形品の製造方法は、得ようとする成形品に応じて適宜選択できる。
本発明の成形品の製造方法としては、例えば、インフレーション成形法、押出成形法、射出成形法、発泡射出成形法、射出圧縮成形法、ブロー成形法、プレス成形法、カレンダー成形法、真空成形法等が挙げられる。
表1~6に示す各成分を含む樹脂組成物を準備した。なお、表中の組成の数値の単位は「質量%」である。
「ステアリン酸Zn:ステアリン酸」とは、樹脂組成物に含まれる、ステアリン酸亜鉛とステアリン酸滑剤との質量比を意味する。
ポリエチレン系樹脂-1:高密度ポリエチレンと、直鎖状低密度ポリエチレンとを、高密度ポリエチレン:直鎖状低密度ポリエチレン(質量比)=95.0:5.0の割合で含む混合物
ポリエチレン系樹脂-2:高密度ポリエチレンのみ
ポリエチレン系樹脂-3:直鎖状低密度ポリエチレンのみ
上記直鎖状低密度ポリエチレンは、JIS K 6922-1(ISO1133)によるMFR(190℃、2.16kg)が1.0g/10分である。
重質炭酸カルシウム粒子(平均粒径:2.2μm、表面処理なし)
ステアリン酸Zn:ステアリン酸亜鉛
ステアリン酸Mg:ステアリン酸マグネシウム
ステアロアミド
ステアリン酸
ポリアクリル酸Na:ポリアクリル酸ナトリウム
インフレーション成形品として、フィルムを作製した。
具体的には、インフレーションフィルム押出ライン(60mmの円形ダイ、1.2mmのダイギャップ、30mmのネジ直径、L/D比=30)により、厚さ30μmのフィルムを作製した。フィルムは、2.5のBUR(ブローアップ比)で処理した。
なお、押出機において、各区域の温度は180℃~200℃に設定し、回転数は20rpmに維持した。
インフレーション成形品の成形時における各樹脂組成物の成形加工性、及び得られた各成形品の外観を下記の方法で評価した。その結果を表1~6に示す。
各樹脂組成物の成形のし易さ(本例ではブローのし易さ)を、ブローの様子を目視観察し、以下の基準で評価した。
A:非常にブローし易い。
B:Aほどではないがブローし易い。
C:ややブローし難い。
D:ブローし難い。
各樹脂組成物から得られた成形品の外観を目視観察し、以下の基準で評価した。
A:非常に滑らかで良好な外観である。
B:Aほどではないが滑らかな外観である。
C:表面にやや凹凸が認められる。
D:表面に多くの凹凸が認められる。
この様な効果は、ポリエチレン系樹脂として高密度ポリエチレン及び直鎖状低密度ポリエチレンの混合物を用いた場合において、より奏され易い傾向にあった。
Claims (8)
- 樹脂組成物であって、
ポリエチレン系樹脂と、無機物質粉末と、ステアリン酸亜鉛と、ステアリン酸とを含み、
前記ポリエチレン系樹脂と前記無機物質粉末との質量比が、10:90~90:10であり、
前記ステアリン酸亜鉛の含有量が、前記樹脂組成物に対して0.05質量%以上0.60質量%以下であり、
前記ステアリン酸の含有量が、前記樹脂組成物に対して0.10質量%以上1.20質量%以下であり、
前記ステアリン酸亜鉛と前記ステアリン酸との質量比が、1:1.5~1:4である、
樹脂組成物。 - 前記ポリエチレン系樹脂が、
JIS K 6922-1(ISO1133)によるMFR(190℃、21.6kg)が5g/10分以上15g/10分以下である高密度ポリエチレンと、
JIS K 6922-1(ISO1133)によるMFR(190℃、2.16kg)が0.5g/10分以上1.5g/10分以下である直鎖状低密度ポリエチレンとを含み、
前記高密度ポリエチレンと前記直鎖状低密度ポリエチレンとの質量比が、92.5:7.5~99.5:0.5である、
請求項1に記載の樹脂組成物。 - 前記樹脂組成物に対して、0.15質量%以上1.80質量%以下のポリエチレン系ワックスを更に含む、請求項1又は2に記載の樹脂組成物。
- 前記無機物質粉末が、重質炭酸カルシウムである、請求項1から3の何れかに記載の樹脂組成物。
- 前記重質炭酸カルシウムの平均粒子径が、0.7μm以上6.0μm以下である、請求項4に記載の樹脂組成物。
- 請求項1から5の何れかに記載の樹脂組成物から得られた成形品。
- 前記成形品がインフレーション成形品である、請求項6に記載の成形品。
- 前記成形品が押出成形品である、請求項6に記載の成形品。
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