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

Definitions

• the present invention relates to polyethylene resin compositions and polyethylene resin packaging materials.
• Patent Documents 1 and 2 disclose adding calcium carbonate to a resin.
• the present invention provides a polyethylene resin composition that provides a film having film strength, elongation, seal strength, and impact strength even when an inorganic compound is added, and polyethylene resin packaging using the polyethylene resin composition.
• the purpose is to provide materials.
• the present invention includes the following aspects [1] to [5].
• [1] A resin composition containing an inorganic compound and a resin component, wherein the resin component is a copolymer of ethylene and an ⁇ -olefin having 6 to 8 carbon atoms, and has a melt flow rate of 0.8 g/10.
• ethylene- ⁇ -olefin copolymer A having a weight of 4.0 g/10 minutes or more
• ethylene- ⁇ -olefin copolymer B obtained by copolymerizing high-density polyethylene and ethylene with an ⁇ -olefin having 4 carbon atoms.
• the content of the inorganic compound is 30% by mass or more and 65% by mass or less with respect to the total mass of the resin composition, and the ethylene- ⁇ -olefin copolymer A content is 50% by mass or more and 95% by mass or less with respect to the total mass of the resin component.
• a polyethylene-based resin packaging material formed from the polyethylene-based resin composition according to any one of [1] to [3].
• the polyethylene-based resin packaging material according to [4] which is a garbage bag, a plastic shopping bag, a fashion bag, a storage bag or a packaging bag.
• a polyethylene-based resin composition that provides a film having both film strength, elongation, seal strength, and impact strength even when an inorganic compound is added, and a polyethylene-based resin composition using the polyethylene-based resin composition A resin packaging material can be provided.
• the polyethylene-based resin composition of the present invention (hereinafter also referred to as "PE-based resin composition") is a resin composition containing an inorganic compound and a resin component.
• inorganic compound examples include, but are not limited to, calcium carbonate, titanium oxide, silica, clay, talc, kaolin, and aluminum hydroxide. Among them, calcium carbonate is preferred. As the inorganic compound, one kind may be used alone, or two or more kinds may be used in combination.
• the calcium carbonate may be so-called heavy calcium carbonate obtained by mechanically pulverizing limestone, or so-called precipitated calcium carbonate obtained by the carbonation method.
• Calcium carbonate may be surface-treated or may not be surface-treated.
• As calcium carbonate one type may be used alone, or two or more types may be used in combination.
• the average particle size of calcium carbonate is preferably 5.0 ⁇ m or less, more preferably 3.0 ⁇ m or less. If the average particle size of calcium carbonate is equal to or less than the upper limit of the above range, excellent moldability can be ensured, and defects such as aggregation, holes due to the size of the particles themselves, and poor appearance are less likely to occur during film forming.
• the lower limit of the average particle size of calcium carbonate is preferably 0.1 ⁇ m.
• the average particle size of calcium carbonate is preferably 0.1 ⁇ m or more and 5.0 ⁇ m or less. The average particle size of calcium carbonate is measured by an air permeation method.
• the top-cut particle size of calcium carbonate is preferably 15 ⁇ m or less, more preferably 10 ⁇ m or less.
• the top-cut particle size is measured with an X-ray transmission particle size distribution analyzer.
• the 45 ⁇ m sieve residue of calcium carbonate is preferably 0.01% by weight or less.
• the 45 ⁇ m sieve residue is measured using a JIS standard sieve.
• the resin components include ethylene- ⁇ -olefin copolymer A (hereinafter also referred to as “copolymer A”), high-density polyethylene (hereinafter also referred to as “HDPE”) and ethylene- ⁇ -olefin copolymer. B (hereinafter also referred to as “copolymer B”), and either one or both of them.
• Copolymer A is an ethylene- ⁇ -olefin copolymer obtained by copolymerizing ethylene and an ⁇ -olefin having 6 to 8 carbon atoms and having a melt flow rate of 0.8 g/10 min or more and 4.0 g/10 min or less. It is a polymer.
• HDPE is polyethylene with a density of 0.942 to 0.970.
• Copolymer B is an ethylene- ⁇ -olefin copolymer obtained by copolymerizing ethylene and an ⁇ -olefin having 4 carbon atoms.
• the combination selected from copolymer A, HDPE and copolymer B may be a combination of copolymer A and HDPE, a combination of copolymer A and copolymer B, or a combination of copolymer A and HDPE. and the copolymer B may be a combination.
• Copolymer A is a copolymer obtained by copolymerization using ethylene and an ⁇ -olefin having 6 to 8 carbon atoms, and has a linear low density with a density of 0.910 to 0.925.
• Polyethylene (LLDPE) is preferred.
• Specific examples of ⁇ -olefins used in copolymer A include 1-hexene and 1-octene.
• the ⁇ -olefins used in the copolymer A may be of one type or two or more types.
• MFR of copolymer A is 0.8 g/10 min or more and 4.0 g/10 min or less. If the MFR of the copolymer A is at least the above lower limit, excellent moldability can be ensured even at a low molding temperature, so deterioration of the copolymer A can be suppressed. If the MFR of the copolymer A is equal to or less than the above upper limit, the melt tension does not become too low, and thus the film formation is facilitated.
• the lower limit of MFR of copolymer A is preferably 0.9 g/10 minutes or more, more preferably 1.0 g/10 minutes or more.
• the upper limit of MFR of copolymer A is preferably 2.5 g/10 minutes or less, more preferably 2.0 g/10 minutes or less, and even more preferably 1.5 g/10 minutes or less.
• the MFR is a value obtained by applying a load of 2.16 kg to a resin (polymer) heated to 190° C. and measuring the amount of resin flowing out from an orifice with a diameter of 2.09 mm in 10 minutes.
• the melting point of the copolymer A is preferably 90° C. or higher and 140° C. or lower, more preferably 100° C. or higher and 125° C. or lower.
• the melting point of the copolymer A is at least the lower limit of the above range, the shape of the heat-sealed bag is good.
• the melting point of the copolymer A is equal to or lower than the upper limit of the above range, the heat sealing time can be shortened, and the bag-making speed (production speed) is improved.
• the melting point is the temperature corresponding to the melting peak measured by differential scanning calorimetry (DSC).
• copolymer A for example, among LLDPE (C6-LLDPE) in which the ⁇ -olefin has 6 carbon atoms and LLDPE (C8-LLDPE) in which the ⁇ -olefin has 8 carbon atoms, the MFR is within the above range. I can exemplify what is satisfied.
• Copolymer A contained in the PE-based resin composition may be of one type or two or more types.
• the method for producing the copolymer A is not particularly limited. Polymerization using a Kaminsky-type catalyst based on the catalyst can be exemplified. As the polymerization method, any of solution polymerization method, slurry polymerization method, gas phase polymerization method and high pressure ion polymerization method may be used. Moreover, one-stage polymerization may be used, or multi-stage polymerization of two or more stages may be used.
• Copolymer B is a copolymer obtained by copolymerization using ethylene and an ⁇ -olefin having 4 carbon atoms, and has a density of 0.910 or more and 0.925 or less linear low density polyethylene (LLDPE ) is preferred.
• LLDPE linear low density polyethylene
• a specific example of the ⁇ -olefin used in the copolymer B is 1-butene.
• the method for producing the copolymer B is not particularly limited, and for example, the same method as the method for producing the copolymer B can be exemplified.
• the resin component contained in the PE-based resin composition of the present invention may be a component consisting only of copolymer A and HDPE, may be a component consisting only of copolymer A and copolymer B, or may be a component consisting of copolymer A and HDPE. and the copolymer B alone may be used.
• the resin component may contain resin components other than the copolymer A, HDPE and copolymer B as long as the effects of the present invention are not impaired.
• the other resin component is not particularly limited, and examples thereof include copolymer A, polyethylene other than HDPE and copolymer B, ethylene-vinyl acetate resin (EVA), ethylene-vinyl alcohol copolymer (EVOH), and ethylene.
• EVA ethylene-vinyl acetate resin
• EVOH ethylene-vinyl alcohol copolymer
• ethylene - A propylene copolymer can be exemplified.
• the PE-based resin composition of the present invention may contain additives as necessary.
• additives include antioxidants, light stabilizers, lubricants, dispersants, pigments, antistatic agents, and animal repellents.
• the number of additives may be one, or two or more.
• the content of the inorganic compound in the PE-based resin composition of the present invention is 30% by mass or more and 65% by mass or less with respect to the total mass of the resin composition. If the content of the inorganic compound is at least the above lower limit, the effect of suppressing the amount of resin used can be sufficiently obtained. Sufficient film strength can be obtained if the content of the inorganic compound is equal to or less than the above upper limit.
• the lower limit of the content of the inorganic compound is preferably 40% by mass or more. As for the upper limit of content of the said inorganic compound, 55 mass % or less is preferable.
• the content of the resin component in the PE-based resin composition of the present invention is preferably 35% by mass or more and 70% by mass or less with respect to the total mass of the resin composition.
• the content of the resin component is at least the above lower limit, sufficient film strength is likely to be obtained. If the content of the resin component is equal to or less than the above upper limit, the effect of suppressing the amount of resin used can be sufficiently obtained.
• the lower limit of the content of the resin component is preferably 45% by mass or more.
• the upper limit of content of the said resin component 60 mass % or less is preferable.
• the content of the copolymer A in the PE-based resin composition is 50% by mass or more and 95% by mass or less with respect to the total mass of the resin components. If the content of the copolymer A is at least the above lower limit, sufficient film strength can be obtained. When the content of the copolymer A is equal to or less than the above upper limit, the total amount of HDPE and the copolymer B is relatively high, so the tensile strength is excellent.
• the lower limit of the content of copolymer A is preferably 55% by mass or more, more preferably 60% by mass or more.
• the upper limit of the content of copolymer A is preferably 92% by mass or less. When the PE-based resin composition contains the copolymer B, the upper limit of the content of the copolymer A is more preferably 90% by mass or less, and even more preferably 80% by mass or less.
• the content of HDPE in the PE-based resin composition of the present invention is preferably 5% by mass or more and 20% by mass or less with respect to the total mass of the resin components.
• the content of HDPE is at least the above lower limit, the bag-making properties of the film are stabilized.
• the content of HDPE is equal to or less than the above upper limit, sufficient film strength can be obtained.
• the lower limit of the HDPE content is more preferably 8% by mass or more.
• the upper limit of the HDPE content is more preferably 15% by mass or less, and even more preferably 12% by mass or less.
• the content of the copolymer B in the PE-based resin composition of the present invention is preferably 10% by mass or more and 40% by mass or less with respect to the total mass of the resin components.
• the content of the copolymer B is at least the above lower limit, stable moldability can be obtained. If the content of the copolymer B is equal to or less than the above upper limit, sufficient film strength can be obtained.
• the lower limit of the content of the copolymer B is more preferably 20% by mass or more.
• the upper limit of the content of the copolymer B is more preferably 30% by mass or less.
• the total content of the copolymer A, HDPE and copolymer B with respect to the total mass of the resin components does not exceed 100% by mass.
• the total content of all LLDPE in the PE-based resin composition of the present invention is preferably 80% by mass or more and 100% by mass or less with respect to the total mass of the resin components.
• the total content of LLDPE is at least the above lower limit, the overall film strength is excellent. If the total content of LLDPE is equal to or less than the above upper limit, excellent opening property is obtained.
• the lower limit of the total content of LLDPE is more preferably 85% by mass or more.
• the upper limit of the total content of the LLDPE is preferably 95% by mass or less, more preferably 93% by mass or less.
• the content of the additive in the PE-based resin composition of the present invention is preferably 3% by mass or less, more preferably 1% by mass or less, relative to the total mass of the PE-based resin composition.
• the method for producing the PE-based resin composition of the present invention is not particularly limited, and examples thereof include a method of mixing each component using a single-screw extruder, a multi-screw extruder, a Banbury mixer, a kneader, or the like.
• a masterbatch is prepared by pre-mixing the copolymer A and a part of the resin components other than the copolymer A used as necessary with inorganic compounds and additives in advance, and the masterbatch and the remainder of the resin component may be mixed with.
• the mixing temperature during production of the PE-based resin composition can be adjusted as appropriate, and can be, for example, 150° C. or higher and 190° C. or lower.
• the polyethylene-based resin packaging material of the present invention (hereinafter referred to as "PE-based resin packaging material") is a packaging material formed from the PE-based resin composition of the present invention.
• PE-based resin packaging material As the aspect of the PE-based resin packaging material of the present invention, known aspects can be adopted except that the PE-based resin composition of the present invention is used.
• Applications of the PE-based resin packaging material are not particularly limited, and examples thereof include garbage bags, plastic shopping bags, fashion bags, storage bags, and packaging bags.
• the method for producing the PE-based resin packaging material of the present invention a known method can be adopted except that the PE-based resin composition of the present invention is used.
• a method of forming the PE-based resin composition of the present invention into a film and heat-sealing the bag can be exemplified.
• Examples of the method of forming into a film include inflation molding, T-die extrusion molding, and the like.
• the molding temperature can be adjusted as appropriate, and can be, for example, 150° C. or higher and 190° C. or lower.
• the thickness of the film may be appropriately set according to the application, and can be, for example, 10 ⁇ m or more and 70 ⁇ m or less.
• the PE-based resin composition of the present invention contains a specific ratio of copolymer A and at least one of HDPE and copolymer B as resin components.
• a film having good film strength, elongation, sealing strength and impact strength can be obtained even if it contains an inorganic compound.
• the PE-based resin packaging material obtained by using the PE-based resin composition of the present invention can be produced with high productivity and can withstand packaging and transportation of heavy objects.
• HDPE High density polyethylene, trade name "F0554”, manufactured by SCA.
• (Copolymer B) B-1 C4-LLDPE, trade name "FS153S”, manufactured by SCA.
• Example 1 As the inflation molding machine, an extruder (manufactured by Placo Co., Ltd.) having a cylinder inner diameter of 55 mm and a screw L/D of 32, and an annular die having a die diameter of 100 mm ⁇ and a lip of 3 mm were used. 65% by mass of MB-1, 30% by mass of polymer A-1, and 5% by mass of HDPE-1 were charged into an extruder while preparing a PE resin composition. A tubular film having a thickness of 18 ⁇ m and a folded width of 460 mm was formed by inflation molding. The extrusion temperature was 170° C. and the blow ratio was about 3.0.
• a bag-shaped PE-based resin packaging material was produced by heat-sealing and cutting at intervals of 600 mm in the length direction using a bag-making machine (manufactured by Nozaki Kogyo Co., Ltd.).
• the heat sealing temperature was 160°C to 180°C.
• the content of calcium carbonate in the packaging material (resin composition) was 52.0% by mass, the ratio of copolymer A to the resin component was 89.6% by mass, and the ratio of HDPE was 10.4% by mass. rice field.
• Examples 2 to 6 A bag-shaped PE-based resin packaging material was produced in the same manner as in Example 1, except that the composition of the PE-based resin composition was changed as shown in Table 1.
• the tensile strength of the film of each example was measured according to JIS Z 1702 using a universal tester EZ-500NXL manufactured by Shimadzu Corporation, and judged according to the following criteria.
• the test piece was a strip having a width of 10 mm and a length of 120 mm, and the tensile speed was set at 500 mm/min.
• the film of each example was measured for elongation according to JIS Z 1702 using a universal tester EZ-500NXL manufactured by Shimadzu Corporation, and evaluated according to the following criteria.
• the test piece was a strip having a width of 10 mm and a length of 120 mm, and the tensile speed was set at 500 mm/min.
• Tables 1 and 2 show the composition and evaluation results of the PE-based resin composition of each example.

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• 2021
  • 2021-04-20 MY MYPI2023006146A patent/MY209384A/en unknown
  • 2021-04-20 WO PCT/JP2021/015975 patent/WO2022224333A1/ja active Application Filing
  • 2021-04-20 CN CN202180097181.2A patent/CN117157353A/zh active Pending
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