WO2023171155A1 - Resin composition for sealant film, sealant film, multilayered film, and method for producing sealant film - Google Patents

Resin composition for sealant film, sealant film, multilayered film, and method for producing sealant film Download PDF

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Publication number
WO2023171155A1
WO2023171155A1 PCT/JP2023/001862 JP2023001862W WO2023171155A1 WO 2023171155 A1 WO2023171155 A1 WO 2023171155A1 JP 2023001862 W JP2023001862 W JP 2023001862W WO 2023171155 A1 WO2023171155 A1 WO 2023171155A1
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Prior art keywords
mass
parts
propylene
resin composition
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PCT/JP2023/001862
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French (fr)
Japanese (ja)
Inventor
輝 神阪
健介 大西
直 井上
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住友化学株式会社
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Publication of WO2023171155A1 publication Critical patent/WO2023171155A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • C08L23/08—Copolymers of ethene
    • 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
    • C08L23/10—Homopolymers or copolymers of propene

Definitions

  • the present invention relates to a resin composition for a sealant film, a sealant film containing the resin composition for a sealant film, a multilayer film comprising the sealant film, and a method for producing a sealant film using the resin composition for a sealant film. .
  • films used for various packaging materials have a structure in which a biaxially stretched polyethylene terephthalate (PET) film is used as a base film, and a polypropylene (PP) unstretched film is laminated on the base film as a sealant film.
  • PET polyethylene terephthalate
  • PP polypropylene
  • a polypropylene biaxially stretched film has inferior heat resistance compared to a polyethylene terephthalate biaxially stretched film.
  • sealant films are used that can be heat-sealed at low temperatures without melting the base film, which is a biaxially stretched polypropylene film.
  • Patent Document 1 describes a composition comprising 65 to 75% by weight of a propylene polymer (A) and 35 to 25% by weight of a propylene-ethylene random copolymer (B),
  • the copolymer (B) has an intrinsic viscosity of 3.0 to 4.5 dl/g, and the ratio of the intrinsic viscosity of the copolymer (B) to the intrinsic viscosity of the polymer (A) is 1.9 to 4.5 dl/g. 2.6, and a resin composition having an n-hexane extraction amount of 3.0% by weight or less has been proposed.
  • packaging bags formed using a sealant film are sometimes subjected to sterilization treatment by heating to a temperature of 120° C. or higher while food is housed in the packaging bag, for example, in applications for retort food packaging. be.
  • the sealant film formed using the resin composition described in Patent Document 1 is heated to a temperature of 120° C. or higher, there is a possibility that the sealant films may fuse together. Therefore, there is a demand for a sealant film that is excellent in the ability to prevent sealant films from fusing together (hereinafter also referred to as "retort fusing resistance”) in such a temperature range.
  • the present invention has been made in view of the above circumstances, and provides a resin composition for sealant film, which makes it possible to obtain a sealant film with relatively excellent retort fusion resistance, and a resin composition for sealant film.
  • An object of the present invention is to provide a sealant film containing the present invention, a multilayer film including the sealant film, and a method for producing a sealant film using the resin composition for a sealant film.
  • the resin composition for sealant film according to the present invention is A propylene polymer (1) containing 98% by mass or more of structural units derived from propylene; More than 40% by mass and less than 90% by mass of structural units derived from propylene, and more than 10% by mass and less than 60% by mass of structural units derived from at least one selected from the group consisting of ethylene and ⁇ -olefins having 4 to 12 carbon atoms.
  • the sealant film according to the present invention contains the above resin composition for sealant film.
  • the multilayer film according to the present invention includes the above sealant film as a sealant layer.
  • the method for manufacturing a sealant film according to the present invention includes: A melt-kneading step of melt-kneading the above resin composition for sealant film, an extrusion step of extruding the melt-kneaded composition; A film forming step of forming the extruded composition into a film having a thickness of 5 ⁇ m or more and 200 ⁇ m or less is included.
  • a resin composition for a sealant film capable of obtaining a sealant film having relatively excellent retort fusion resistance, a sealant film containing the resin composition for a sealant film, and a multilayer film comprising the sealant film.
  • a film and a method for producing a sealant film using the resin composition for sealant film can be provided.
  • the resin composition for a sealant film according to the present embodiment contains a propylene polymer (1), a propylene copolymer (2), and a ⁇ crystal nucleating agent. Further, the resin composition for sealant film may contain a propylene copolymer (3) from the viewpoint of having excellent heat seal strength at low temperatures. Furthermore, the resin composition for sealant film may contain an ethylene copolymer from the viewpoint of having better retort fusion resistance.
  • the propylene polymer (1) contains 98% by mass or more of structural units derived from propylene.
  • the content of structural units derived from propylene in the propylene polymer (1) is preferably 99% by mass or more and 100% by mass or less, and more preferably 100% by mass. That is, the propylene polymer (1) may be a propylene homopolymer.
  • the propylene polymer (1) may contain a structural unit derived from at least one member selected from the group consisting of ethylene and ⁇ -olefins having 4 to 12 carbon atoms.
  • the content of structural units derived from at least one selected from the group consisting of ethylene and ⁇ -olefins having 4 to 12 carbon atoms in the propylene polymer (1) is preferably 2% by mass or less, more preferably is from 0% by mass to 1% by mass.
  • the propylene copolymer (2) contains more than 40% by mass and less than 90% by mass of structural units derived from propylene and at least one member selected from the group consisting of ethylene and ⁇ -olefins having 4 to 12 carbon atoms. More than 10% by mass and less than 60% by mass of structural units.
  • the content of structural units derived from propylene in the propylene copolymer (2) is preferably more than 50% by mass and less than 90% by mass, more preferably more than 50% by mass and not more than 80% by mass, and even more preferably It is 60% by mass or more and 80% by mass or less. Further, the content of structural units derived from at least one selected from the group consisting of ethylene and ⁇ -olefins having 4 to 12 carbon atoms is preferably more than 10% by mass and less than 50% by mass, more preferably 20% by mass. The content is at least 20% by mass and less than 50% by mass, more preferably at least 20% by mass and at most 40% by mass.
  • the structural units derived from propylene are more than 50% by mass and less than 90% by mass, and the structural units derived from ethylene. More than 10% by mass and less than 50% by mass.
  • Examples of the ⁇ -olefin having 4 to 12 carbon atoms in the propylene polymer (1) and the propylene copolymer (2) include 1-butene, 1-hexene, and 1-octene, preferably It is 1-butene.
  • the structural unit derived from an ⁇ -olefin having 4 to 12 carbon atoms may be a structural unit derived from one type of ⁇ -olefin alone or a structural unit derived from two or more types of ⁇ -olefin. good.
  • Examples of the method for producing the propylene polymer (1) and the propylene copolymer (2) include a method in which raw materials such as propylene and ethylene are polymerized using a Ziegler-Natta catalyst, a metallocene catalyst, or the like.
  • the propylene polymer (1) and propylene copolymer (2) can be polymerized in an inert solvent such as hexane, heptane, toluene, or xylene, or in liquid propylene or ethylene. , a method in which a catalyst is added to gaseous propylene or ethylene and polymerization is carried out in a gas phase, or a method in which a combination of these is polymerized.
  • the method for producing the propylene polymer (1) and the propylene copolymer (2) preferably involves producing the propylene polymer (1) in the substantial absence of an inert solvent. At least one kind selected from the group consisting of propylene, ethylene, and an ⁇ -olefin having 4 to 12 carbon atoms in the gas phase in the presence of the propylene polymer (1).
  • a second step is performed in which a propylene-based copolymer (2) is produced by polymerizing the above, and a propylene-based multi-stage polymer is obtained.
  • the propylene-based multistage polymer is a propylene-based polymer composition containing a propylene-based polymer (1) component and a propylene-based copolymer (2) component.
  • the method for adjusting the ethylene content of the propylene polymer (1) and propylene copolymer (2) is to add a molecular weight regulator such as hydrogen gas or a metal compound and ethylene to each step during polymerization.
  • a molecular weight regulator such as hydrogen gas or a metal compound and ethylene
  • Examples include methods of adding in a certain amount, and methods of adjusting temperature, pressure, etc. during polymerization.
  • the production ratio of propylene polymer (1) and propylene copolymer (2) is determined by the polymerization time in the first and second steps, the size of the polymerization tank, the amount of polymer retained in the polymerization tank, and the polymerization temperature. , polymerization pressure, etc. If necessary, drying may be performed at a temperature below the melting temperature of polypropylene in order to remove residual solvent of polypropylene and ultra-low molecular weight oligomers produced as by-products during production. Examples of the drying method include methods described in JP-A-55-75410 and Japanese Patent No. 2565753.
  • the melt flow rate (MFR) of the propylene-based multistage polymer obtained in the second step, measured at a temperature of 230°C and a load of 2.16 kg, is preferably from the viewpoint of improving the processability and hygiene of the film. is 0.001 g/10 minutes or more and 10 g/10 minutes or less, more preferably 0.01 g/10 minutes or more and 10 g/10 minutes or less, and even more preferably 0.01 g/10 minutes or more and 5 g/10 minutes or less. be. Further, even in a propylene polymer composition containing a propylene multistage polymer and other components, the MFR can be made to be in the same range as the above-mentioned propylene multistage polymer. Note that MFR is measured by method A specified in JIS K7210-1.
  • the propylene-based copolymer (3) contains structural units derived from propylene in an amount of 90% by mass or more and less than 98% by mass, and derived from at least one member selected from the group consisting of ethylene and ⁇ -olefins having 4 to 12 carbon atoms. More than 2% by mass and not more than 10% by mass of structural units.
  • the content of structural units derived from propylene in the propylene copolymer (3) is preferably 94% by mass or more and less than 98% by mass, more preferably 94% by mass or more and 97% by mass or less. Further, the content of structural units derived from at least one selected from the group consisting of ethylene and ⁇ -olefins having 4 to 12 carbon atoms in the propylene copolymer (3) is preferably more than 2% by mass and 6% by mass. % or less, more preferably 3% by mass or more and 6% by mass or less.
  • Examples of the ⁇ -olefin having 4 to 12 carbon atoms include 1-butene, 1-hexene, and 1-octene, with 1-butene being preferred.
  • the structural unit derived from an ⁇ -olefin having 4 to 12 carbon atoms may be a structural unit derived from one type of ⁇ -olefin alone or a structural unit derived from two or more types of ⁇ -olefin. good.
  • the propylene copolymer (3) may be produced using a heterogeneous catalyst or may be produced using a homogeneous catalyst (for example, a metallocene catalyst).
  • the melt flow rate (MFR) of the propylene copolymer (3) measured at a temperature of 230°C and a load of 2.16 kg is preferably 1 g/10 minutes or more and 10 g/10 minutes or less, more preferably 1 g/10 minutes. It is 8 g/10 minutes or more, more preferably 2 g/10 minutes or more and 5 g/10 minutes or less. Furthermore, even in a propylene polymer composition containing the propylene copolymer (3) and other components, it is possible to set the MFR to the same range as the above-mentioned propylene copolymer (3). can. Note that MFR is measured by method A specified in JIS K7210-1.
  • the melting point of the propylene copolymer (3) measured by differential scanning calorimetry is preferably 120°C or more and 165°C or less, more preferably 120°C or more and 150°C or less, and even more preferably is 125°C or more and 150°C or less.
  • the ethylene copolymer contains structural units derived from ethylene in an amount of 60% by mass to 98% by mass, and structural units derived from ⁇ -olefins having 4 to 12 carbon atoms in a content of 2% by mass to 40% by mass, including.
  • the content of structural units derived from ethylene in the ethylene copolymer is preferably 70% by mass or more and 95% by mass or less, more preferably 75% by mass or more and 95% by mass or less, and even more preferably 80% by mass.
  • the content is 95% by mass or less.
  • the content of structural units derived from ⁇ -olefins having 4 to 12 carbon atoms in the ethylene copolymer is preferably 5% by mass or more and 30% by mass or less, more preferably 5% by mass or more and 25% by mass. % or less, more preferably 5% by mass or more and 20% by mass or less.
  • Examples of ⁇ -olefins having 4 to 12 carbon atoms include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, and 4-methyl-1-pentene. , 4-methyl-1-hexene, etc., and 1-hexene is preferable from the viewpoint of increasing heat sealing strength.
  • the ⁇ -olefin having 4 to 12 carbon atoms is preferably an ⁇ -olefin having 4 to 8 carbon atoms.
  • the structural unit derived from an ⁇ -olefin having 4 to 12 carbon atoms may be a structural unit derived from one type of ⁇ -olefin alone or a structural unit derived from two or more types of ⁇ -olefin. good.
  • the density of the ethylene copolymer is preferably 850 kg/m 3 or more and 950 kg/m 3 or less, more preferably 850 kg/m 3 or more and 930 kg/m 3 or less, and even more preferably 880 kg/m 3 or more and 930 kg/m 3 or less. m 3 or less.
  • the density of the ethylene copolymer is 850 kg/m 3 or more, a film with excellent rigidity can be obtained, and when the density is 950 kg/m 3 or less, a film with excellent impact resistance at low temperatures can be obtained. Obtainable.
  • the density can be within the same range as the density of the above-mentioned ethylene copolymer.
  • the density of the ethylene copolymer is measured according to JIS K6922-1.
  • the melt flow rate (MFR) of the ethylene copolymer measured at a temperature of 190° C. and a load of 2.16 kg is preferably 0.1 g/10 minutes or more and 50 g/10 minutes or less, more preferably 0.1 g/10 minutes or less. It is 10 minutes or more and 10 g/10 minutes or less, more preferably 1 g/10 minutes or more and 5 g/10 minutes or less. Furthermore, even in an ethylene polymer composition containing an ethylene copolymer and other components, the MFR can be made within the same range as the above-mentioned ethylene copolymer. Note that MFR is measured by method A specified in JIS K7210-1.
  • the molecular weight distribution of the ethylene copolymer is preferably 1 or more and 5 or less, more preferably 1 or more and 4 or less, and still more preferably 2 or more and 4 or less.
  • molecular weight distribution of the ethylene copolymer is 1 or more, extrusion load is reduced and processability is improved. Further, by setting the molecular weight distribution of the ethylene copolymer to 5 or less, a film having excellent impact resistance at low temperatures can be obtained.
  • “molecular weight distribution” refers to the ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (Mw/ Mn).
  • ethylene and ⁇ -olefin are copolymerized using a metallocene catalyst, and the density of the ethylene copolymer is made to be 850 kg/m 3 or more.
  • a method for reducing the weight to 950 kg/m 3 or less can be mentioned.
  • Ethylene-based copolymers can be produced using, for example, metallocene catalysts.
  • a metallocene catalyst is, for example, a catalyst for olefin polymerization using a transition metal compound having a group having a cyclopentadiene type anion skeleton (hereinafter sometimes referred to as a "metallocene transition metal compound").
  • the metallocene transition metal compound is, for example, a compound of the formula MLaXna (where M is a transition metal atom of Group 4 of the periodic table of elements or a lanthanide series; L is a group having a cyclopentadiene type anion skeleton or a hetero A group containing atoms, at least one of which has a cyclopentadiene type anion skeleton. Plural Ls may be crosslinked with each other.
  • X is a halogen atom, a hydrogen atom, or a group having 1 to 20 carbon atoms. It is a hydrocarbon group.N represents the valence of a transition metal atom, and a is an integer satisfying 0 ⁇ a ⁇ n).
  • Examples of the metallocene transition metal compound represented by the above formula include bis(1,3-n-butylmethylcyclopentadienyl)zirconium dichloride, bis(1,3-n-propylmethylcyclopentadienyl) Zirconium dichloride, bis(n-butylcyclopentadienyl)zirconium dichloride, bis(1,3-dimethylcyclopentadienyl)zirconium dichloride, bis(1,3-diethylcyclopentadienyl)zirconium dichloride, ethylene bis(indenyl) ) zirconium dichloride, ethylenebis(4-methyl-1-indenyl)zirconium dichloride, ethylenebis(4,5,6,7-tetrahydro-1-indenyl)zirconium dichloride, and the like.
  • the metallocene transition metal compound described above is preferably used in contact with an activation promoter.
  • the activation co-catalyst include an alumoxane compound and an activation co-catalyst formed by using a combination of an organoaluminum compound and a boron compound such as trityl borate or anilinium borate. Further, it may be used in combination with a particulate carrier including an inorganic carrier such as SiO 2 or Al 2 O 3 or an organic carrier such as a polymer such as ethylene or styrene.
  • a ⁇ -crystal nucleating agent refers to a compound that can form a ⁇ -crystal, which is a hexagonal crystal structure, in a propylene polymer.
  • the ⁇ -crystal nucleating agent various conventionally known ⁇ -crystal nucleating agents can be used.
  • amide compounds such as N,N'-dicyclohexyl-2,6-naphthalene dicarboxamide, N,N'-dicyclohexyl terephthalamide, N,N'-diphenylhexanediamide, tetraoxaspiro compounds, quinacridone, Quinacridones represented by quinacridone quinone, iron oxide with nanoscale size, calcium pimelate, potassium 1,2-hydroxystearate, magnesium benzoate or succinate, carboxylic acids represented by magnesium phthalate, etc.
  • alkaline or alkaline earth metal salts aromatic sulfonic acid compounds represented by sodium benzenesulfonate or sodium naphthalenesulfonate, diesters or triesters of di- or tribasic carboxylic acids, phthalocyanine blue, etc.
  • Commercially available products of N,N'-dicyclohexyl-2,6-naphthalenedicarboxyamide include, for example, NU-100 (manufactured by Shin Nippon Chemical Co., Ltd.).
  • the concentration of the ⁇ -crystal nucleating agent is preferably 100 mass ppm or more and 3000 mass ppm or less, more preferably 300 mass ppm or more and 2000 mass ppm or less, and still more preferably 300 mass ppm or more and 3000 mass ppm or less.
  • the content ranges from 500 ppm to 1500 ppm by mass, particularly preferably from 500 ppm to 1500 ppm by mass.
  • the resin composition for sealant film according to the present embodiment may contain additives and other resins as necessary.
  • additives include antioxidants, neutralizers, ultraviolet absorbers, antistatic agents, lubricants, nucleating agents, adhesives, antifogging agents, antiblocking agents, melt flow rate regulators, and the like.
  • antioxidants include phenolic antioxidants, phosphorous antioxidants, sulfur-based antioxidants, etc., which have both a phenol-based antioxidant mechanism and a phosphorus-based antioxidant mechanism in one molecule. Complex type antioxidants having units can also be used.
  • Examples of other resins include elastomers such as styrene-butadiene-styrene copolymer and styrene copolymer rubber obtained by hydrogenating styrene-isoprene-styrene copolymer.
  • the content of the propylene polymer (1) is preferably set to 100 parts by mass in total of the content of the polymers contained in the resin composition. 50 parts by mass or more and 95 parts by mass or less, more preferably 50 parts by mass or more and less than 89 parts by mass, even more preferably 60 parts by mass or more and less than 89 parts by mass, particularly preferably 60 parts by mass or more and less than 80 parts by mass. It is. Further, the content of the propylene copolymer (2) is preferably 5 parts by mass or more and 50 parts by mass or less with respect to a total of 100 parts by mass of the polymers contained in the resin composition. , more preferably more than 11 parts by weight and not more than 50 parts by weight, still more preferably more than 11 parts by weight and not more than 40 parts by weight, particularly preferably not less than 20 parts by weight and not more than 40 parts by weight.
  • the total content of polymers contained in the resin composition is Preferably, the content of the propylene polymer (1) is 50 parts by mass or more and 95 parts by mass or less, and the content of the propylene copolymer (2) is 5 parts by mass or more with respect to 100 parts by mass. 50 parts by mass or less, more preferably, the content of the propylene polymer (1) is 50 parts by mass or more and less than 89 parts by mass, and the content of the propylene copolymer (2) is 11 parts by mass. More than 50 parts by mass or less.
  • the propylene-based copolymer (3) is The content of the polymer (1) is preferably 10 parts by mass or more and 78 parts by mass or less, more preferably 10 parts by mass or more and 70 parts by mass or less, and even more preferably 20 parts by mass or more and 60 parts by mass or less. , particularly preferably 20 parts by mass or more and 50 parts by mass or less, and the content of the propylene copolymer (2) is preferably 2 parts by mass or more and 40 parts by mass or less, more preferably 5 parts by mass or more and 40 parts by mass.
  • the content of the propylene copolymer (3) is preferably 20 parts by weight. parts to 80 parts by mass, more preferably 20 parts to 70 parts by mass, still more preferably 30 parts to 70 parts by mass, particularly preferably 35 parts to 65 parts by mass. .
  • a polymer contained in the resin composition from the viewpoint of excellent retort fusion resistance and heat sealing strength at low temperatures, it is preferable to use a polymer contained in the resin composition.
  • the content of the propylene polymer (1) is 10 parts by mass or more and 78 parts by mass or less, and the content of the propylene copolymer (2) is 2 parts by mass or more with respect to the total content of 100 parts by mass.
  • the content of the propylene copolymer (3) is 20 parts by mass or more and 80 parts by mass or less.
  • the propylene-based polymer ( The content of 1) is preferably 35 parts by mass or more and 75 parts by mass or less, more preferably 40 parts by mass or more and 75 parts by mass or less, still more preferably 40 parts by mass or more and 70 parts by mass or less, and particularly preferably is 45 parts by mass or more and 70 parts by mass or less, and the content of the propylene copolymer (2) is preferably 5 parts by mass or more and 50 parts by mass or less, more preferably 5 parts by mass or more and 45 parts by mass or less.
  • the content of the ethylene copolymer is preferably 10 parts by mass or more and 45 parts by mass or less, particularly preferably 10 parts by mass or more and 40 parts by mass or less, and the content of the ethylene copolymer is preferably 2 parts by mass or more and 30 parts by mass or less. It is more preferably 5 parts by mass or more and 30 parts by mass or less, still more preferably 10 parts by mass or more and 30 parts by mass or less, particularly preferably 15 parts by mass or more and 30 parts by mass or less.
  • the resin composition for a sealant film according to the present embodiment from the viewpoint of excellent retort fusion resistance and excellent bag breakage resistance, the resin composition preferably contains a polymer contained in the resin composition.
  • the content of propylene polymer (1) is 35 parts by mass or more and 75 parts by mass or less, and the content of propylene copolymer (2) is 5 parts by mass or more and 50 parts by mass.
  • the content of the ethylene copolymer is 2 parts by mass or more and 30 parts by mass or less.
  • the sealant film according to this embodiment contains the above resin composition for sealant film.
  • the thickness of the sealant film is preferably 5 ⁇ m or more and 200 ⁇ m or less, more preferably 30 ⁇ m or more and 150 ⁇ m or less.
  • the multilayer film according to this embodiment includes the above sealant film as a sealant layer.
  • the thickness of the multilayer film is preferably 5 ⁇ m or more and 500 ⁇ m or less, more preferably 30 ⁇ m or more and 150 ⁇ m or less.
  • the multilayer film includes, for example, packaging applications for foods, textiles, miscellaneous goods, and the like.
  • the multilayer film is preferably a multilayer film used for retort food packaging.
  • the multilayer film may also be used as a material for forming packaging bags.
  • the multilayer film can be produced by laminating the sealant film as a sealant layer with a base layer.
  • Examples of the method for laminating the base material layer and the sealant layer include known film manufacturing methods such as the T-die method and the tubular method, with the T-die method being preferred.
  • the method for producing a sealant film according to the present embodiment includes a melt-kneading step of melt-kneading the resin composition for sealant film, an extrusion step of extruding the melt-kneaded composition, and a step of extruding the extruded composition to a thickness of 5 ⁇ m or more.
  • a film forming step of forming a film to a thickness of 200 ⁇ m or less is included.
  • the propylene polymer (1), the propylene copolymer (2), the ⁇ -crystal nucleating agent, and if necessary, the propylene copolymer (3) and the ethylene copolymer The mixture, additives and other resins are melt-kneaded.
  • a propylene multistage polymer obtained by polymerization in multiple stages may be used as the propylene polymer (1) and the propylene copolymer (2).
  • the melt-kneading can be carried out using conventionally known methods and equipment.
  • the above-mentioned materials may be mixed using a mixing device such as a Henschel mixer, a ribbon blender, or a tumble mixer, and then melt-kneaded.
  • a mixing device such as a Henschel mixer, a ribbon blender, or a tumble mixer
  • melt-kneaded after obtaining a homogeneous mixture by continuously feeding each of the above materials at a fixed rate using a quantitative feeder, the mixture is transferred to a single screw or two or more screw extruder, a Banbury mixer, etc. , a method of melt-kneading using a roll-type kneader or the like.
  • the resin temperature during melt-kneading is preferably 190°C or higher and 320°C or lower, more preferably 210°C or higher and 280°C or lower.
  • the melt-kneaded composition is extruded from a T-die using an extruder.
  • the extrusion temperature can be, for example, 190°C or higher and 320°C or lower. Note that the extrusion temperature is the temperature of the T-die itself.
  • the composition extruded from a T-die is cooled and solidified while being wound up with a chill roll to form a film to a predetermined thickness.
  • the cooling temperature can be, for example, 20° C. or higher and 140° C. or lower.
  • the resin composition for sealant film, the sealant film, the multilayer film, and the method for manufacturing the sealant film according to the present embodiment are not limited to the above embodiments, and various methods may be used without departing from the gist of the present invention. can be changed.
  • the content of structural units derived from ethylene contained in the propylene-ethylene copolymer was measured by 13 C-NMR.
  • the propylene polymer composition was determined.
  • the content of the propylene-ethylene copolymer contained and the content of structural units derived from ethylene contained in the propylene-ethylene copolymer in the propylene-based polymer composition were determined.
  • the content of structural units derived from ethylene contained in the ethylene copolymer was measured by 13 C-NMR. Specifically, based on the 13 C-NMR spectrum of the ethylene polymer composition measured under the following conditions, the ethylene copolymer composition was determined based on Randall's method (Rev. Macromol. The content of structural units derived from ethylene contained in the coalescence was determined.
  • a sample was prepared by uniformly dissolving approximately 250 mg of the propylene polymer composition or ethylene polymer composition in 2.5 mL of solvent in a 10 mm ⁇ test tube, and the 13 C-NMR spectrum of the sample was measured under the following conditions. Measured below.
  • melt flow rate (MFR, unit: g/10 minutes) The melt flow rate was measured at a temperature of 230° C. or 190° C. and a load of 2.16 kg according to method A specified in JIS K7210-1.
  • Heat seal strength (unit: N/15mm) A multilayer film was used in which a sealant film, a 7 ⁇ m thick aluminum foil, and a 12 ⁇ m thick polyethylene terephthalate film were laminated in the stated order by a dry lamination method. Using a heat sealer manufactured by Toyo Tester Kogyo Co., Ltd., fold the multilayer film in half with the sealant film on the inside, and then fold the ends opposite the folded position in the direction in which the folded position extends under the following conditions. It was heat-sealed in a strip along the .
  • ⁇ Seal bar Double-sided flat surface heating ⁇ Seal temperature: 170°C ⁇ Seal pressure: 1.0kg/ cm2 ⁇ Sealing time: 1.0sec ⁇ Seal width: 10mm Then, a test piece with a width of 15 mm was cut out in a direction perpendicular to the seal width direction, and heat treated in an oven at 120° C. for 30 minutes. Thereafter, the heat seal strength of the test piece was measured using a tensile tester (Tensilon manufactured by Orientec) under conditions of a peel angle of 90° and a tensile speed of 200 mm/min.
  • a tensile tester Teensilon manufactured by Orientec
  • Retort fusion resistance evaluation (unit: N/12cm 2 ) After the measurement surfaces of two 100 mm x 30 mm sealant films were placed on top of each other, a weight of 500 g with a ground contact area of 40 mm x 30 mm was placed on the film, and the film was heat-treated in an oven at 120° C. for 30 minutes. The resulting laminate of two sealant films was left in an atmosphere at a temperature of 23° C. and a humidity of 50% for 30 minutes or more, and then the shear peeling force was measured at a tensile rate of 200 mm/min.
  • Propylene polymer composition C In the first step, propylene is polymerized in the gas phase using a Ziegler-Natta type catalyst, and in the second step, propylene and ethylene are copolymerized in the gas phase to produce propylene homopolymer C-1. and propylene-ethylene copolymer C-2 was obtained.
  • Propylene polymer composition D Using a Ziegler-Natta type catalyst, propylene is polymerized in the gas phase in the first step, and propylene and ethylene are copolymerized in the gas phase in the second step to produce propylene homopolymer D-1.
  • a propylene polymer composition D was obtained, which consisted of the following: and propylene-ethylene copolymer D-2.
  • Propylene polymer composition G Propylene and ethylene were copolymerized in the gas phase using a Ziegler-Natta type catalyst to obtain propylene-ethylene copolymer G. Based on 100 parts by mass of the obtained propylene-ethylene copolymer G, 0.05 parts by mass of calcium stearate, 0.2 parts by mass of Irganox 1010 (manufactured by BASF), and 0.05 parts by mass of Irgafos 168 (manufactured by BASF).
  • pellet-shaped propylene polymer composition G has a content of structural units derived from ethylene in the propylene-ethylene copolymer G of 5.9% by mass, and a melt flow rate measured at 230°C. It was 3.5g/10 minutes.
  • Ethylene polymer composition H As the ethylene polymer composition H, Sumikasen E FV205 (ethylene-1-hexene copolymer composition, manufactured by Sumitomo Chemical Co., Ltd.) was used. Ethylene-based polymer composition H has an ethylene-1-hexene copolymer content of 99.9% by mass, and a content of ethylene-derived structural units in the ethylene-1-hexene copolymer of 93% by mass. %, the content of structural units derived from 1-hexene was 7% by mass, the melt flow rate measured at 190° C. was 2.2 g/10 minutes, and the density was 921 kg/m 3 .
  • Example 1 Resin composition 1
  • propylene polymer composition A For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.03 parts by mass of NU-100 ( ⁇ crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 1.
  • NU-100 ⁇ crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.
  • the obtained resin composition 1 has a content of propylene homopolymer A-1 of 78 parts by mass with respect to a total of 100 parts by mass of the content of polymers contained in resin composition 1, and propylene -
  • the content of ethylene copolymer A-2 is 22 parts by mass
  • the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%
  • the flow rate was 2.4 g/10 minutes.
  • Table 1 The results are shown in Table 1.
  • Resin composition 1 was melt-kneaded at a resin temperature of 280° C. using a 50 mm T-die film forming device (V-50-F600 type film forming device manufactured by Tanabe Plastics Co., Ltd., equipped with a 400 mm width T-die) and extruded from the T-die. .
  • the mixture was cooled and solidified while being wound around a chill roll having a cooling temperature of 80° C. to obtain a sealant film having a thickness of 70 ⁇ m.
  • Retort fusion resistance was evaluated using the obtained sealant film.
  • a heat seal strength evaluation was performed on a multilayer film produced using the obtained sealant film. The results are shown in Table 2.
  • Example 2 Resin composition 2
  • propylene polymer composition A For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) 0.05 parts by mass and 0.1 parts by mass of NU-100 ( ⁇ crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 2.
  • NU-100 ⁇ crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.
  • the resulting resin composition 2 has a propylene homopolymer A-1 content of 77 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 2, and propylene -
  • the content of ethylene copolymer A-2 is 23 parts by mass
  • the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%
  • the flow rate was 2.5 g/10 minutes.
  • Table 1 The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that Resin Composition 2 was used, and its properties were evaluated. The results are shown in Table 2.
  • Example 3 Resin composition 3
  • propylene polymer composition A For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.2 parts by mass of NU-100 ( ⁇ crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 3. Ta.
  • hydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.
  • Irganox 1010 manufactured by BASF Corporation
  • Irgafos 168 manufactured by BASF Corporation
  • NU-100 ⁇ crystal nucleating agent
  • the resulting resin composition 3 has a content of propylene homopolymer A-1 of 78 parts by mass with respect to a total of 100 parts by mass of the content of polymers contained in resin composition 3, and propylene -
  • the content of ethylene copolymer A-2 is 22 parts by mass
  • the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%
  • the flow rate was 2.3 g/10 minutes.
  • Table 1 The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition 3 was used, and its properties were evaluated. The results are shown in Table 2.
  • Resin composition 4 was obtained by pellet blending 50% by mass of resin composition 3 and 50% by mass of propylene polymer composition G. The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition 4 was used, and its properties were evaluated. The results are shown in Table 2.
  • Resin composition 5 was obtained by pellet blending 80% by mass of resin composition 2 and 20% by mass of ethylene polymer composition H. The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition 5 was used, and its properties were evaluated. The results are shown in Table 2.
  • Example 6 Resin composition 6
  • propylene polymer composition B For 100 parts by mass of propylene polymer composition B, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.1 part by mass of NU-100 ( ⁇ crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 6. Ta.
  • hydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.
  • Irganox 1010 manufactured by BASF Corporation
  • Irgafos 168 manufactured by BASF Corporation
  • NU-100 ⁇ crystal nucleating agent
  • the resulting resin composition 6 has a propylene homopolymer B-1 content of 84 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 6, and propylene -
  • the content of ethylene copolymer B-2 is 16 parts by mass
  • the content of structural units derived from ethylene in propylene-ethylene copolymer B-2 is 55% by mass
  • the flow rate was 22 g/10 minutes.
  • Table 1 The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition 6 was used, and its properties were evaluated. The results are shown in Table 2.
  • Example 7 Resin composition 7
  • propylene polymer composition C For 100 parts by mass of propylene polymer composition C, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.1 part by mass of NU-100 ( ⁇ crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 7. Ta.
  • hydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.
  • Irganox 1010 manufactured by BASF Corporation
  • Irgafos 168 manufactured by BASF Corporation
  • NU-100 ⁇ crystal nucleating agent
  • the resulting resin composition 7 has a propylene homopolymer C-1 content of 80 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 7, and propylene -
  • the content of the ethylene copolymer C-2 is 20 parts by mass
  • the content of structural units derived from ethylene in the propylene-ethylene copolymer C-2 is 51% by mass
  • the flow rate was 6.5 g/10 minutes.
  • Table 1 The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition 7 was used, and its properties were evaluated. The results are shown in Table 2.
  • Example 8 Resin composition 8
  • a pellet-shaped resin composition 8 was obtained.
  • the obtained resin composition 8 has a content of propylene homopolymer D-1 and a content of propylene homopolymer E based on a total of 100 parts by mass of the polymer content contained in resin composition 8.
  • the total amount is 89 parts by mass
  • the content of propylene-ethylene copolymer D-2 is 11 parts by mass
  • the content of structural units derived from ethylene in propylene-ethylene copolymer D-2 is 39 parts by mass. % by mass
  • the melt flow rate measured at 230°C was 2.7 g/10 minutes. The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition 8 was used, and its properties were evaluated. The results are shown in Table 2.
  • Example 9 Resin composition 9
  • propylene polymer composition A For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.03 parts by mass of TMB-5 ( ⁇ crystal nucleating agent, manufactured by Shanxi Provincial Institute of Chemical Industry) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 9. Obtained.
  • hydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.
  • Irganox 1010 manufactured by BASF Corporation
  • Irgafos 168 manufactured by BASF Corporation
  • TMB-5 ⁇ crystal nucleating agent, manufactured by Shanxi Provincial Institute of Chemical Industry
  • the resulting resin composition 9 has a propylene homopolymer A-1 content of 78 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 9, and propylene -
  • the content of ethylene copolymer A-2 is 22 parts by mass
  • the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%
  • the flow rate was 2.4 g/10 minutes.
  • Table 1 The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition 9 was used, and its properties were evaluated. The results are shown in Table 2.
  • Example 10 Resin composition 10
  • propylene polymer composition A For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.1 part by mass of TMB-5 ( ⁇ crystal nucleating agent, manufactured by Shanxi Provincial Institute of Chemical Industry) were mixed in a Henschel mixer, and melt extrusion was performed to obtain pellet-shaped resin composition 10. Obtained.
  • hydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.
  • Irganox 1010 manufactured by BASF Corporation
  • Irgafos 168 manufactured by BASF Corporation
  • TMB-5 ⁇ crystal nucleating agent, manufactured by Shanxi Provincial Institute of Chemical Industry
  • the resulting resin composition 10 has a propylene homopolymer A-1 content of 78 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 10, and propylene homopolymer A-1.
  • the content of ethylene copolymer A-2 is 22 parts by mass
  • the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%
  • the flow rate was 2.4 g/10 minutes.
  • Table 1 The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that Resin Composition 10 was used, and its properties were evaluated. The results are shown in Table 2.
  • Resin composition C1 For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) 0.05 parts by mass were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition C1.
  • hydrotalcite manufactured by Kyowa Chemical Industry Co., Ltd.
  • Irganox 1010 manufactured by BASF Corporation
  • Irgafos 168 manufactured by BASF Corporation
  • the obtained resin composition C1 has a content of propylene homopolymer A-1 of 78 parts by mass with respect to a total content of 100 parts by mass of polymers contained in the resin composition C1, and propylene -
  • the content of ethylene copolymer A-2 is 22 parts by mass
  • the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 35% by mass
  • the flow rate was 2.3 g/10 minutes.
  • Table 1 The results are shown in Table 1.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition C1 was used, and its properties were evaluated. The results are shown in Table 2.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition C2 was used, and its properties were evaluated. The results are shown in Table 2.
  • a sealant film was produced in the same manner as in Example 1, except that resin composition C3 was used, and its properties were evaluated. The results are shown in Table 2.
  • the resin compositions of each example that satisfy all the constituent requirements of the present invention can provide a sealant film with relatively excellent retort fusion resistance. Further, the resin compositions of each example can provide a sealant film with excellent heat seal strength at low temperatures.
  • the resin composition of Comparative Example 1 does not contain a ⁇ -crystal nucleating agent, the retort fusion resistance and heat seal strength at low temperatures of the film obtained using the resin composition are poor. Since the resin composition of Comparative Example 2 does not contain the propylene copolymer (2) and the ⁇ -crystal nucleating agent, the retort fusion resistance of the film obtained using the resin composition and the low temperature stability are Heat seal strength is poor. Since the resin composition of Comparative Example 3 does not contain the propylene copolymer (2), the retort fusion resistance of the film obtained using the resin composition is poor.
  • the resin composition for a sealant film of the present invention can be used for a sealant film that has relatively excellent retort fusion resistance, and has high applicability for applications such as retort packaging materials equipped with the sealant film.

Abstract

The problem addressed is to provide a resin composition for a sealant film capable of yielding a sealant film having relatively excellent retort adhesion resistance, a sealant film containing said resin composition for a sealant film, a multilayered film equipped with said sealant film, and a method for producing a sealant film using the resin composition for a sealant film. The resin composition for a sealant film according to the present invention contains: a propylene polymer (1) containing 98 mass% or more of structural units derived from propylene; a propylene copolymer (2) containing from more than 40 mass% to less than 90 mass% of structural units derived from propylene and from more than 10 mass% to less than 60 mass% of structural units derived from at least one selected from the group consisting of ethylene and C4-12 α-olefins; and a β crystal nucleating agent.

Description

シーラントフィルム用樹脂組成物、シーラントフィルム、多層フィルム、および、シーラントフィルムの製造方法Resin composition for sealant film, sealant film, multilayer film, and method for producing sealant film
　本発明は、シーラントフィルム用樹脂組成物、該シーラントフィルム用樹脂組成物を含有するシーラントフィルム、該シーラントフィルムを備える多層フィルム、および、前記シーラントフィルム用樹脂組成物を用いたシーラントフィルムの製造方法に関する。 The present invention relates to a resin composition for a sealant film, a sealant film containing the resin composition for a sealant film, a multilayer film comprising the sealant film, and a method for producing a sealant film using the resin composition for a sealant film. .
　従来、例えば各種包装材料に用いられるフィルムとしては、ポリエチレンテレフタレート（ＰＥＴ）系二軸延伸フィルムを基材フィルムとし、該基材フィルムに、ポリプロピレン（ＰＰ）系無延伸フィルムをシーラントフィルムとして積層した構成のものが知られている。かかる構成のフィルムは、シーラントフィルムを内側にして収容空間を形成するようにヒートシールすることで、包装袋を形成する。 Conventionally, films used for various packaging materials, for example, have a structure in which a biaxially stretched polyethylene terephthalate (PET) film is used as a base film, and a polypropylene (PP) unstretched film is laminated on the base film as a sealant film. are known. A film having such a structure is heat-sealed with the sealant film on the inside to form a storage space, thereby forming a packaging bag.
　近年、この種のフィルムに対してもリサイクルの要望が高まっており、モノマテリアル化が求められている。具体的には、ポリプロピレンで構成されるシーラントフィルムと同系種のポリプロピレン系二軸延伸フィルムを基材フィルムとして採用することが好適とされている。 In recent years, there has been an increasing demand for recycling of this type of film, and there is a need for it to be made into a monomaterial. Specifically, it is considered suitable to employ, as the base film, a polypropylene biaxially stretched film that is similar to the sealant film made of polypropylene.
　ところが、ポリプロピレン系二軸延伸フィルムは、ポリエチレンテレフタレート系二軸延伸フィルムと比較して、耐熱性が劣る。このため、ポリプロピレン系二軸延伸フィルムである基材フィルムを融解させることなく、低温でヒートシール可能なシーラントフィルムが用いられている。 However, a polypropylene biaxially stretched film has inferior heat resistance compared to a polyethylene terephthalate biaxially stretched film. For this reason, sealant films are used that can be heat-sealed at low temperatures without melting the base film, which is a biaxially stretched polypropylene film.
　シーラントフィルムに用いられる樹脂組成物として、例えば、特許文献１には、プロピレン系重合体（Ａ）６５～７５重量％とプロピレン－エチレンランダム共重合体（Ｂ）３５～２５重量％とからなり、前記共重合体（Ｂ）の極限粘度が３．０～４．５ｄｌ／ｇであり、前記重合体（Ａ）の極限粘度に対する前記共重合体（Ｂ）の極限粘度の比が１．９～２．６であり、ｎ－ヘキサン抽出量が３．０重量％以下である樹脂組成物が提案されている。 As a resin composition used for a sealant film, for example, Patent Document 1 describes a composition comprising 65 to 75% by weight of a propylene polymer (A) and 35 to 25% by weight of a propylene-ethylene random copolymer (B), The copolymer (B) has an intrinsic viscosity of 3.0 to 4.5 dl/g, and the ratio of the intrinsic viscosity of the copolymer (B) to the intrinsic viscosity of the polymer (A) is 1.9 to 4.5 dl/g. 2.6, and a resin composition having an n-hexane extraction amount of 3.0% by weight or less has been proposed.
特開２０１３－２０９６３５号公報JP2013-209635A
　ところで、シーラントフィルムを用いて形成された包装袋は、例えば、レトルト食品包装の用途において、該包装袋に食品が収容された状態で、１２０℃以上の温度に加熱して殺菌処理を行う場合がある。しかしながら、特許文献１に記載の樹脂組成物を用いて形成されたシーラントフィルムは、１２０℃以上の温度に加熱すると該シーラントフィルム同士が融着する虞がある。そのため、このような温度域においてシーラントフィルム同士の融着を防ぐ性能（以下では、「耐レトルト融着性」とも記す。）に優れたシーラントフィルムが要望されている。 By the way, packaging bags formed using a sealant film are sometimes subjected to sterilization treatment by heating to a temperature of 120° C. or higher while food is housed in the packaging bag, for example, in applications for retort food packaging. be. However, when the sealant film formed using the resin composition described in Patent Document 1 is heated to a temperature of 120° C. or higher, there is a possibility that the sealant films may fuse together. Therefore, there is a demand for a sealant film that is excellent in the ability to prevent sealant films from fusing together (hereinafter also referred to as "retort fusing resistance") in such a temperature range.
　本発明は、このような事情に鑑みてなされたものであり、耐レトルト融着性に比較的優れたシーラントフィルムを得ることが可能なシーラントフィルム用樹脂組成物、該シーラントフィルム用樹脂組成物を含有するシーラントフィルム、該シーラントフィルムを備える多層フィルム、および、前記シーラントフィルム用樹脂組成物を用いたシーラントフィルムの製造方法を提供することを課題とする。 The present invention has been made in view of the above circumstances, and provides a resin composition for sealant film, which makes it possible to obtain a sealant film with relatively excellent retort fusion resistance, and a resin composition for sealant film. An object of the present invention is to provide a sealant film containing the present invention, a multilayer film including the sealant film, and a method for producing a sealant film using the resin composition for a sealant film.
　本発明に係るシーラントフィルム用樹脂組成物は、
　プロピレンに由来する構造単位を９８質量％以上含むプロピレン系重合体（１）と、
　プロピレンに由来する構造単位を４０質量％超９０質量％未満と、エチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位を１０質量％超６０質量％未満と、を含むプロピレン系共重合体（２）と、
　β晶核剤と、
　を含有する。 The resin composition for sealant film according to the present invention is
A propylene polymer (1) containing 98% by mass or more of structural units derived from propylene;
More than 40% by mass and less than 90% by mass of structural units derived from propylene, and more than 10% by mass and less than 60% by mass of structural units derived from at least one selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms. A propylene copolymer (2) containing less than %,
β-crystal nucleating agent,
Contains.
　本発明に係るシーラントフィルムは、上記のシーラントフィルム用樹脂組成物を含有する。 The sealant film according to the present invention contains the above resin composition for sealant film.
　本発明に係る多層フィルムは、上記のシーラントフィルムをシーラント層として備える。 The multilayer film according to the present invention includes the above sealant film as a sealant layer.
　本発明に係るシーラントフィルムの製造方法は、
　上記のシーラントフィルム用樹脂組成物を溶融混練する溶融混練工程と、
　溶融混練された組成物を押し出す押出工程と、
　押し出された組成物を厚さ５μｍ以上２００μｍ以下に製膜する製膜工程と、を含む。 The method for manufacturing a sealant film according to the present invention includes:
A melt-kneading step of melt-kneading the above resin composition for sealant film,
an extrusion step of extruding the melt-kneaded composition;
A film forming step of forming the extruded composition into a film having a thickness of 5 μm or more and 200 μm or less is included.
　本発明によれば、耐レトルト融着性に比較的優れたシーラントフィルムを得ることが可能なシーラントフィルム用樹脂組成物、該シーラントフィルム用樹脂組成物を含有するシーラントフィルム、該シーラントフィルムを備える多層フィルム、および、前記シーラントフィルム用樹脂組成物を用いたシーラントフィルムの製造方法を提供することができる。 According to the present invention, there is provided a resin composition for a sealant film capable of obtaining a sealant film having relatively excellent retort fusion resistance, a sealant film containing the resin composition for a sealant film, and a multilayer film comprising the sealant film. A film and a method for producing a sealant film using the resin composition for sealant film can be provided.
　以下、本発明の実施形態について説明するが、本発明は、以下の実施形態に限定されるものではない。 Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments.
　＜シーラントフィルム用樹脂組成物＞
　本実施形態に係るシーラントフィルム用樹脂組成物は、プロピレン系重合体（１）と、プロピレン系共重合体（２）と、β晶核剤と、を含有する。また、前記シーラントフィルム用樹脂組成物は、低温でのヒートシール強度に優れるという観点から、プロピレン系共重合体（３）を含有してもよい。さらに、前記シーラントフィルム用樹脂組成物は、耐レトルト融着性により優れるという観点から、エチレン系共重合体を含有してもよい。 <Resin composition for sealant film>
The resin composition for a sealant film according to the present embodiment contains a propylene polymer (1), a propylene copolymer (2), and a β crystal nucleating agent. Further, the resin composition for sealant film may contain a propylene copolymer (3) from the viewpoint of having excellent heat seal strength at low temperatures. Furthermore, the resin composition for sealant film may contain an ethylene copolymer from the viewpoint of having better retort fusion resistance.
　プロピレン系重合体（１）は、プロピレンに由来する構造単位を９８質量％以上含む。プロピレン系重合体（１）におけるプロピレンに由来する構造単位の含有量は、好ましくは９９質量％以上１００質量％以下であり、より好ましくは１００質量％である。すなわち、プロピレン系重合体（１）は、プロピレン単独重合体であってもよい。 The propylene polymer (1) contains 98% by mass or more of structural units derived from propylene. The content of structural units derived from propylene in the propylene polymer (1) is preferably 99% by mass or more and 100% by mass or less, and more preferably 100% by mass. That is, the propylene polymer (1) may be a propylene homopolymer.
　プロピレン系重合体（１）は、エチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位を含んでいてもよい。プロピレン系重合体（１）におけるエチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位の含有量は、好ましくは２質量％以下であり、より好ましくは０質量％以上１質量％以下である。 The propylene polymer (1) may contain a structural unit derived from at least one member selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms. The content of structural units derived from at least one selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms in the propylene polymer (1) is preferably 2% by mass or less, more preferably is from 0% by mass to 1% by mass.
　プロピレン系共重合体（２）は、プロピレンに由来する構造単位を４０質量％超９０質量％未満と、エチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位を１０質量％超６０質量％未満と、を含む。 The propylene copolymer (2) contains more than 40% by mass and less than 90% by mass of structural units derived from propylene and at least one member selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms. More than 10% by mass and less than 60% by mass of structural units.
　プロピレン系共重合体（２）におけるプロピレンに由来する構造単位の含有量は、好ましくは５０質量％超９０質量％未満であり、より好ましくは５０質量％超８０質量％以下であり、さらに好ましくは６０質量％以上８０質量％以下である。また、エチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位の含有量は、好ましくは１０質量％超５０質量％未満であり、より好ましくは２０質量％以上５０質量％未満であり、さらに好ましくは２０質量％以上４０質量％以下である。 The content of structural units derived from propylene in the propylene copolymer (2) is preferably more than 50% by mass and less than 90% by mass, more preferably more than 50% by mass and not more than 80% by mass, and even more preferably It is 60% by mass or more and 80% by mass or less. Further, the content of structural units derived from at least one selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms is preferably more than 10% by mass and less than 50% by mass, more preferably 20% by mass. The content is at least 20% by mass and less than 50% by mass, more preferably at least 20% by mass and at most 40% by mass.
　プロピレン系共重合体（２）の一態様として、低温でのヒートシール強度に優れる観点から、好ましくは、プロピレンに由来する構造単位を５０質量％超９０質量％未満と、エチレンに由来する構造単位を１０質量％超５０質量％未満と、を含む。 As one embodiment of the propylene-based copolymer (2), from the viewpoint of excellent heat sealing strength at low temperatures, preferably the structural units derived from propylene are more than 50% by mass and less than 90% by mass, and the structural units derived from ethylene. More than 10% by mass and less than 50% by mass.
　プロピレン系重合体（１）およびプロピレン系共重合体（２）における炭素原子数４～１２のα－オレフィンとしては、例えば、１－ブテン、１－ヘキセン、１－オクテンなどが挙げられ、好ましくは１－ブテンである。炭素原子数４～１２のα－オレフィンに由来する構造単位は、１種単独のα－オレフィンに由来する構造単位であっても、２種以上のα－オレフィンに由来する構造単位であってもよい。 Examples of the α-olefin having 4 to 12 carbon atoms in the propylene polymer (1) and the propylene copolymer (2) include 1-butene, 1-hexene, and 1-octene, preferably It is 1-butene. The structural unit derived from an α-olefin having 4 to 12 carbon atoms may be a structural unit derived from one type of α-olefin alone or a structural unit derived from two or more types of α-olefin. good.
　プロピレン系重合体（１）およびプロピレン系共重合体（２）の製造方法としては、チーグラー・ナッタ触媒や、メタロセン触媒などを用いて、原料であるプロピレンやエチレンなどを重合させる方法が挙げられる。 Examples of the method for producing the propylene polymer (1) and the propylene copolymer (2) include a method in which raw materials such as propylene and ethylene are polymerized using a Ziegler-Natta catalyst, a metallocene catalyst, or the like.
　プロピレン系重合体（１）およびプロピレン系共重合体（２）の重合方法としては、ヘキサン、ヘプタン、トルエン、キシレンなどの不活性溶剤中で重合する方法、液状のプロピレンやエチレン中で重合する方法、気体であるプロピレンやエチレン中に触媒を添加し、気相状態で重合する方法、または、これらを組み合わせて重合する方法が挙げられる。 The propylene polymer (1) and propylene copolymer (2) can be polymerized in an inert solvent such as hexane, heptane, toluene, or xylene, or in liquid propylene or ethylene. , a method in which a catalyst is added to gaseous propylene or ethylene and polymerization is carried out in a gas phase, or a method in which a combination of these is polymerized.
　プロピレン系重合体（１）およびプロピレン系共重合体（２）の製造方法は、生産性の観点から、好ましくは、実質的に不活性溶剤の不存在下で、プロピレン系重合体（１）を生成する第一工程を行い、次いで、該プロピレン系重合体（１）の存在下、気相中で、プロピレンとエチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種とを重合して、プロピレン系共重合体（２）を生成する第二工程を行い、プロピレン系多段重合体を得る方法である。プロピレン系多段重合体は、プロピレン系重合体（１）成分およびプロピレン系共重合体（２）成分を含むプロピレン系重合体組成物である。 From the viewpoint of productivity, the method for producing the propylene polymer (1) and the propylene copolymer (2) preferably involves producing the propylene polymer (1) in the substantial absence of an inert solvent. At least one kind selected from the group consisting of propylene, ethylene, and an α-olefin having 4 to 12 carbon atoms in the gas phase in the presence of the propylene polymer (1). In this method, a second step is performed in which a propylene-based copolymer (2) is produced by polymerizing the above, and a propylene-based multi-stage polymer is obtained. The propylene-based multistage polymer is a propylene-based polymer composition containing a propylene-based polymer (1) component and a propylene-based copolymer (2) component.
　プロピレン系重合体（１）およびプロピレン系共重合体（２）の、エチレン含有量の調整方法としては、重合時の各工程で、水素ガスや金属化合物などの分子量調節剤およびエチレンを、それぞれ適切な量で加える方法、重合時の温度・圧力などを調節する方法が挙げられる。 The method for adjusting the ethylene content of the propylene polymer (1) and propylene copolymer (2) is to add a molecular weight regulator such as hydrogen gas or a metal compound and ethylene to each step during polymerization. Examples include methods of adding in a certain amount, and methods of adjusting temperature, pressure, etc. during polymerization.
　プロピレン系重合体（１）およびプロピレン系共重合体（２）の生成割合は、第一工程および第二工程における重合時間、重合槽の大きさ、重合槽中の重合体の保持量、重合温度、重合圧力などにより制御することができる。必要に応じて、ポリプロピレンの残留溶媒や製造時に副生する超低分子量のオリゴマーなどを除去するために、ポリプロピレンが融解する温度以下の温度で乾燥を行ってもよい。乾燥方法としては、例えば、特開昭５５－７５４１０号、特許第２５６５７５３号公報に記載された方法などが挙げられる。 The production ratio of propylene polymer (1) and propylene copolymer (2) is determined by the polymerization time in the first and second steps, the size of the polymerization tank, the amount of polymer retained in the polymerization tank, and the polymerization temperature. , polymerization pressure, etc. If necessary, drying may be performed at a temperature below the melting temperature of polypropylene in order to remove residual solvent of polypropylene and ultra-low molecular weight oligomers produced as by-products during production. Examples of the drying method include methods described in JP-A-55-75410 and Japanese Patent No. 2565753.
　前記第二工程で得られるプロピレン系多段重合体の温度２３０℃、荷重２．１６ｋｇで測定されるメルトフローレート（ＭＦＲ）としては、フィルムの加工性や衛生性を良好にするという観点から、好ましくは０．００１ｇ／１０分以上１０ｇ／１０分以下であり、より好ましくは０．０１ｇ／１０分以上１０ｇ／１０分以下であり、さらに好ましくは０．０１ｇ／１０分以上５ｇ／１０分以下である。また、プロピレン系多段重合体と、それ以外の他の成分と、を含むプロピレン系重合体組成物においても、上述のプロピレン系多段重合体のＭＦＲと同範囲にすることができる。なお、ＭＦＲは、ＪＩＳ　Ｋ７２１０－１に規定されたＡ法により測定される。 The melt flow rate (MFR) of the propylene-based multistage polymer obtained in the second step, measured at a temperature of 230°C and a load of 2.16 kg, is preferably from the viewpoint of improving the processability and hygiene of the film. is 0.001 g/10 minutes or more and 10 g/10 minutes or less, more preferably 0.01 g/10 minutes or more and 10 g/10 minutes or less, and even more preferably 0.01 g/10 minutes or more and 5 g/10 minutes or less. be. Further, even in a propylene polymer composition containing a propylene multistage polymer and other components, the MFR can be made to be in the same range as the above-mentioned propylene multistage polymer. Note that MFR is measured by method A specified in JIS K7210-1.
　プロピレン系共重合体（３）は、プロピレンに由来する構造単位を９０質量％以上９８質量％未満と、エチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位を２質量％超１０質量％以下と、を含む。 The propylene-based copolymer (3) contains structural units derived from propylene in an amount of 90% by mass or more and less than 98% by mass, and derived from at least one member selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms. More than 2% by mass and not more than 10% by mass of structural units.
　プロピレン系共重合体（３）におけるプロピレンに由来する構造単位の含有量は、好ましくは９４質量％以上９８質量％未満であり、より好ましくは９４質量％以上９７質量％以下である。また、プロピレン系共重合体（３）におけるエチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位の含有量は、好ましくは２質量％超６質量％以下であり、より好ましくは３質量％以上６質量％以下である。 The content of structural units derived from propylene in the propylene copolymer (3) is preferably 94% by mass or more and less than 98% by mass, more preferably 94% by mass or more and 97% by mass or less. Further, the content of structural units derived from at least one selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms in the propylene copolymer (3) is preferably more than 2% by mass and 6% by mass. % or less, more preferably 3% by mass or more and 6% by mass or less.
　炭素原子数４～１２のα－オレフィンとしては、例えば、１－ブテン、１－ヘキセン、１－オクテンなどが挙げられ、好ましくは１－ブテンである。炭素原子数４～１２のα－オレフィンに由来する構造単位は、１種単独のα－オレフィンに由来する構造単位であっても、２種以上のα－オレフィンに由来する構造単位であってもよい。 Examples of the α-olefin having 4 to 12 carbon atoms include 1-butene, 1-hexene, and 1-octene, with 1-butene being preferred. The structural unit derived from an α-olefin having 4 to 12 carbon atoms may be a structural unit derived from one type of α-olefin alone or a structural unit derived from two or more types of α-olefin. good.
　プロピレン系共重合体（３）は、不均一系触媒を用いて製造されたものであってもよく、均一系触媒（例えば、メタロセン触媒など）を用いて製造されたものであってもよい。 The propylene copolymer (3) may be produced using a heterogeneous catalyst or may be produced using a homogeneous catalyst (for example, a metallocene catalyst).
　プロピレン系共重合体（３）の温度２３０℃、荷重２．１６ｋｇで測定されるメルトフローレート（ＭＦＲ）は、好ましくは１ｇ／１０分以上１０ｇ／１０分以下であり、より好ましくは１ｇ／１０分以上８ｇ／１０分以下であり、さらに好ましくは２ｇ／１０分以上５ｇ／１０分以下である。また、プロピレン系共重合体（３）と、それ以外の他の成分と、を含むプロピレン系重合体組成物においても、上述のプロピレン系共重合体（３）のＭＦＲと同範囲にすることができる。なお、ＭＦＲは、ＪＩＳ　Ｋ７２１０－１に規定されたＡ法により測定される。 The melt flow rate (MFR) of the propylene copolymer (3) measured at a temperature of 230°C and a load of 2.16 kg is preferably 1 g/10 minutes or more and 10 g/10 minutes or less, more preferably 1 g/10 minutes. It is 8 g/10 minutes or more, more preferably 2 g/10 minutes or more and 5 g/10 minutes or less. Furthermore, even in a propylene polymer composition containing the propylene copolymer (3) and other components, it is possible to set the MFR to the same range as the above-mentioned propylene copolymer (3). can. Note that MFR is measured by method A specified in JIS K7210-1.
　また、プロピレン系共重合体（３）の示差走査熱量測定（ＤＳＣ）により測定される融点は、好ましくは１２０℃以上１６５℃以下であり、より好ましくは１２０℃以上１５０℃以下であり、さらに好ましくは１２５℃以上１５０℃以下である。 Further, the melting point of the propylene copolymer (3) measured by differential scanning calorimetry (DSC) is preferably 120°C or more and 165°C or less, more preferably 120°C or more and 150°C or less, and even more preferably is 125°C or more and 150°C or less.
　エチレン系共重合体は、エチレンに由来する構造単位を６０質量％以上９８質量％以下と、炭素原子数４～１２のα－オレフィンに由来する構造単位を２質量％以上４０質量％以下と、を含む。 The ethylene copolymer contains structural units derived from ethylene in an amount of 60% by mass to 98% by mass, and structural units derived from α-olefins having 4 to 12 carbon atoms in a content of 2% by mass to 40% by mass, including.
　エチレン系共重合体におけるエチレンに由来する構造単位の含有量は、好ましくは７０質量％以上９５質量％以下であり、より好ましくは７５質量％以上９５質量％以下であり、さらに好ましくは８０質量％以上９５質量％以下である。また、エチレン系共重合体における炭素原子数４～１２のα－オレフィンに由来する構造単位の含有量は、好ましくは５質量％以上３０質量％以下であり、より好ましくは５質量％以上２５質量％以下であり、さらに好ましくは５質量％以上２０質量％以下である。 The content of structural units derived from ethylene in the ethylene copolymer is preferably 70% by mass or more and 95% by mass or less, more preferably 75% by mass or more and 95% by mass or less, and even more preferably 80% by mass. The content is 95% by mass or less. The content of structural units derived from α-olefins having 4 to 12 carbon atoms in the ethylene copolymer is preferably 5% by mass or more and 30% by mass or less, more preferably 5% by mass or more and 25% by mass. % or less, more preferably 5% by mass or more and 20% by mass or less.
　炭素原子数４～１２のα－オレフィンとしては、例えば、１－ブテン、１－ペンテン、１－ヘキセン、１－ヘプテン、１－オクテン、１－ノネン、１－デセン、４－メチル－１－ペンテン、４－メチル－１－ヘキセンなどが挙げられ、ヒートシール強度を高める観点から、好ましくは１－ヘキセンである。炭素原子数４～１２のα－オレフィンは、好ましくは炭素原子数４～８のα－オレフィンである。炭素原子数４～１２のα－オレフィンに由来する構造単位は、１種単独のα－オレフィンに由来する構造単位であっても、２種以上のα－オレフィンに由来する構造単位であってもよい。 Examples of α-olefins having 4 to 12 carbon atoms include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, and 4-methyl-1-pentene. , 4-methyl-1-hexene, etc., and 1-hexene is preferable from the viewpoint of increasing heat sealing strength. The α-olefin having 4 to 12 carbon atoms is preferably an α-olefin having 4 to 8 carbon atoms. The structural unit derived from an α-olefin having 4 to 12 carbon atoms may be a structural unit derived from one type of α-olefin alone or a structural unit derived from two or more types of α-olefin. good.
　エチレン系共重合体の密度は、好ましくは８５０ｋｇ／ｍ３以上９５０ｋｇ／ｍ３以下であり、より好ましくは８５０ｋｇ／ｍ３以上９３０ｋｇ／ｍ３以下であり、さらに好ましくは８８０ｋｇ／ｍ３以上９３０ｋｇ／ｍ３以下ある。エチレン系共重合体の密度が８５０ｋｇ／ｍ３以上であることにより、剛性に優れたフィルムを得ることができ、９５０ｋｇ／ｍ３以下であることにより、低温での耐衝撃性に優れたフィルムを得ることができる。また、エチレン系共重合体と、それ以外の他の成分と、を含むエチレン系重合体組成物においても、上述のエチレン系共重合体の密度と同範囲にすることができる。なお、エチレン系共重合体の密度は、ＪＩＳ　Ｋ６９２２－１に従って測定される。 The density of the ethylene copolymer is preferably 850 kg/m 3 or more and 950 kg/m 3 or less, more preferably 850 kg/m 3 or more and 930 kg/m 3 or less, and even more preferably 880 kg/m 3 or more and 930 kg/m 3 or less. m 3 or less. When the density of the ethylene copolymer is 850 kg/m 3 or more, a film with excellent rigidity can be obtained, and when the density is 950 kg/m 3 or less, a film with excellent impact resistance at low temperatures can be obtained. Obtainable. Further, even in an ethylene polymer composition containing an ethylene copolymer and other components, the density can be within the same range as the density of the above-mentioned ethylene copolymer. Note that the density of the ethylene copolymer is measured according to JIS K6922-1.
　エチレン系共重合体の温度１９０℃、荷重２．１６ｋｇで測定されるメルトフローレート（ＭＦＲ）は、好ましくは０．１ｇ／１０分以上５０ｇ／１０分以下であり、より好ましくは０．１ｇ／１０分以上１０ｇ／１０分以下であり、さらに好ましくは１ｇ／１０分以上５ｇ／１０分以下である。また、エチレン系共重合体と、それ以外の他の成分と、を含むエチレン系重合体組成物においても、上述のエチレン系共重合体のＭＦＲと同範囲にすることができる。なお、ＭＦＲは、ＪＩＳ　Ｋ７２１０－１に規定されたＡ法により測定される。 The melt flow rate (MFR) of the ethylene copolymer measured at a temperature of 190° C. and a load of 2.16 kg is preferably 0.1 g/10 minutes or more and 50 g/10 minutes or less, more preferably 0.1 g/10 minutes or less. It is 10 minutes or more and 10 g/10 minutes or less, more preferably 1 g/10 minutes or more and 5 g/10 minutes or less. Furthermore, even in an ethylene polymer composition containing an ethylene copolymer and other components, the MFR can be made within the same range as the above-mentioned ethylene copolymer. Note that MFR is measured by method A specified in JIS K7210-1.
　エチレン系共重合体の分子量分布は、好ましくは１以上５以下であり、より好ましくは１以上４以下であり、さらに好ましくは２以上４以下である。エチレン系共重合体の分子量分布が１以上であることにより、押出負荷が低減され、加工性が良好となる。また、エチレン系共重合体の分子量分布が５以下であることにより、低温での耐衝撃性に優れたフィルムを得ることができる。なお、「分子量分布」とは、ゲルパーミエーションクロマトグラフィー（以下、「ＧＰＣ」と記載することがある。）により測定される重量平均分子量（Ｍｗ）の数平均分子量（Ｍｎ）に対する比（Ｍｗ／Ｍｎ）である。 The molecular weight distribution of the ethylene copolymer is preferably 1 or more and 5 or less, more preferably 1 or more and 4 or less, and still more preferably 2 or more and 4 or less. When the molecular weight distribution of the ethylene copolymer is 1 or more, extrusion load is reduced and processability is improved. Further, by setting the molecular weight distribution of the ethylene copolymer to 5 or less, a film having excellent impact resistance at low temperatures can be obtained. Note that "molecular weight distribution" refers to the ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (Mw/ Mn).
　エチレン系共重合体の分子量分布を上記の範囲とする方法としては、例えば、メタロセン触媒を用いて、エチレンとα－オレフィンを共重合して、エチレン系共重合体の密度を８５０ｋｇ／ｍ３以上９５０ｋｇ／ｍ３以下とする方法が挙げられる。 As a method for making the molecular weight distribution of the ethylene copolymer within the above range, for example, ethylene and α-olefin are copolymerized using a metallocene catalyst, and the density of the ethylene copolymer is made to be 850 kg/m 3 or more. A method for reducing the weight to 950 kg/m 3 or less can be mentioned.
　エチレン系共重合体は、例えば、メタロセン触媒を用いて製造することができる。メタロセン触媒は、例えば、シクロペンタジエン形アニオン骨格を有する基を持つ遷移金属化合物（以下、「メタロセン系遷移金属化合物」と記載することがある。）を用いてなるオレフィン重合用触媒である。 Ethylene-based copolymers can be produced using, for example, metallocene catalysts. A metallocene catalyst is, for example, a catalyst for olefin polymerization using a transition metal compound having a group having a cyclopentadiene type anion skeleton (hereinafter sometimes referred to as a "metallocene transition metal compound").
　メタロセン系遷移金属化合物は、例えば、式　ＭＬａＸｎ－ａ（式中、Ｍは元素の周期律表の第４族またはランタナイド系列の遷移金属原子である。Ｌはシクロペンタジエン形アニオン骨格を有する基またはヘテロ原子を含有する基であり、少なくとも一つはシクロペンタジエン形アニオン骨格を有する基である。複数のＬは互いに架橋していてもよい。Ｘはハロゲン原子、水素原子または炭素原子数１～２０の炭化水素基である。ｎは遷移金属原子の原子価を表し、ａは０＜ａ≦ｎを満足する整数である）で表される化合物が挙げられる。 The metallocene transition metal compound is, for example, a compound of the formula MLaXna (where M is a transition metal atom of Group 4 of the periodic table of elements or a lanthanide series; L is a group having a cyclopentadiene type anion skeleton or a hetero A group containing atoms, at least one of which has a cyclopentadiene type anion skeleton. Plural Ls may be crosslinked with each other. X is a halogen atom, a hydrogen atom, or a group having 1 to 20 carbon atoms. It is a hydrocarbon group.N represents the valence of a transition metal atom, and a is an integer satisfying 0<a≦n).
　上記の式で表されるメタロセン系遷移金属化合物としては、例えば、ビス（１，３－ｎ－ブチルメチルシクロペンタジエニル）ジルコニウムジクロリド、ビス（１，３－ｎ－プロピルメチルシクロペンタジエニル）ジルコニウムジクロリド、ビス（ｎ－ブチルシクロペンタジエニル）ジルコニウムジクロリド、ビス（１，３－ジメチルシクロペンタジエニル）ジルコニウムジクロリド、ビス（１，３－ジエチルシクロペンタジエニル）ジルコニウムジクロリド、エチレンビス（インデニル）ジルコニウムジクロリド、エチレンビス（４－メチル－１－インデニル）ジルコニウムジクロリド、エチレンビス（４，５，６，７－テトラヒドロ－１－インデニル）ジルコニウムジクロリドなどが挙げられる。 Examples of the metallocene transition metal compound represented by the above formula include bis(1,3-n-butylmethylcyclopentadienyl)zirconium dichloride, bis(1,3-n-propylmethylcyclopentadienyl) Zirconium dichloride, bis(n-butylcyclopentadienyl)zirconium dichloride, bis(1,3-dimethylcyclopentadienyl)zirconium dichloride, bis(1,3-diethylcyclopentadienyl)zirconium dichloride, ethylene bis(indenyl) ) zirconium dichloride, ethylenebis(4-methyl-1-indenyl)zirconium dichloride, ethylenebis(4,5,6,7-tetrahydro-1-indenyl)zirconium dichloride, and the like.
　上記のメタロセン系遷移金属化合物は、活性化助触媒と接触させて用いることが好ましい。活性化助触媒としては、例えば、アルモキサン化合物や、有機アルミニウム化合物とトリチルボレート、アニリニウムボレートなどのホウ素化合物とを併用してなる活性化助触媒が挙げられる。また、ＳｉＯ２、Ａｌ２Ｏ３などの無機担体、エチレン、スチレンなどの重合体などの有機担体を含む粒子状担体と組み合わせて用いても良い。 The metallocene transition metal compound described above is preferably used in contact with an activation promoter. Examples of the activation co-catalyst include an alumoxane compound and an activation co-catalyst formed by using a combination of an organoaluminum compound and a boron compound such as trityl borate or anilinium borate. Further, it may be used in combination with a particulate carrier including an inorganic carrier such as SiO 2 or Al 2 O 3 or an organic carrier such as a polymer such as ethylene or styrene.
　β晶核剤とは、プロピレン系重合体に六方晶構造であるβ晶を形成させることができる化合物をいう。β晶核剤としては、従来公知の種々のβ晶核剤を利用することができる。例えば、Ｎ，Ｎ'－ジシクロヘキシル－２，６－ナフタレンジカルボキシアミド、Ｎ，Ｎ'－ジシクロヘキシルテレフタルアミド、Ｎ，Ｎ’－ジフェニルヘキサンジアミドなどに代表されるアミド化合物、テトラオキサスピロ化合物、キナクリドン、キナクリドンキノンなどに代表されるキナクリドン類、ナノスケールのサイズを有する酸化鉄、ピメリン酸カルシウム、１，２－ヒドロキシステアリン酸カリウム、安息香酸マグネシウムもしくはコハク酸マグネシウム、フタル酸マグネシウムなどに代表されるカルボン酸のアルカリもしくはアルカリ土類金属塩、ベンゼンスルホン酸ナトリウムもしくはナフタレンスルホン酸ナトリウムなどに代表される芳香族スルホン酸化合物、二もしくは三塩基カルボン酸のジエステル類もしくはトリエステル類、フタロシアニンブルーなどに代表されるフタロシアニン系顔料、有機二塩基酸である成分Ａと周期律表第ＩＩＡ族金属の酸化物、水酸化物もしくは塩である成分Ｂとからなる二成分系化合物、環状リン化合物とマグネシウム化合物からなる組成物などが挙げられ、これらのうちの１種類または２種類以上を混合して用いても良い。上記のβ晶核剤の中でも、耐レトルト融着性に優れる観点から、好ましくはアミド化合物のＮ，Ｎ'－ジシクロヘキシル－２，６－ナフタレンジカルボキシアミド、Ｎ，Ｎ'－ジシクロヘキシルテレフタルアミド、Ｎ，Ｎ’－ジフェニルヘキサンジアミドであり、より好ましくはＮ，Ｎ'－ジシクロヘキシル－２，６－ナフタレンジカルボキシアミドである。Ｎ，Ｎ'－ジシクロヘキシル－２，６－ナフタレンジカルボキシアミドの市販品としては、例えば、ＮＵ－１００（新日本理化株式会社製）などが挙げられる。 A β-crystal nucleating agent refers to a compound that can form a β-crystal, which is a hexagonal crystal structure, in a propylene polymer. As the β-crystal nucleating agent, various conventionally known β-crystal nucleating agents can be used. For example, amide compounds such as N,N'-dicyclohexyl-2,6-naphthalene dicarboxamide, N,N'-dicyclohexyl terephthalamide, N,N'-diphenylhexanediamide, tetraoxaspiro compounds, quinacridone, Quinacridones represented by quinacridone quinone, iron oxide with nanoscale size, calcium pimelate, potassium 1,2-hydroxystearate, magnesium benzoate or succinate, carboxylic acids represented by magnesium phthalate, etc. alkaline or alkaline earth metal salts, aromatic sulfonic acid compounds represented by sodium benzenesulfonate or sodium naphthalenesulfonate, diesters or triesters of di- or tribasic carboxylic acids, phthalocyanine blue, etc. A composition consisting of a phthalocyanine pigment, a two-component compound consisting of component A, which is an organic dibasic acid, and component B, which is an oxide, hydroxide, or salt of a Group IIA metal of the periodic table, a cyclic phosphorus compound, and a magnesium compound. Among them, one type or a mixture of two or more types may be used. Among the above β-crystal nucleating agents, from the viewpoint of excellent retort fusion resistance, the amide compounds N,N'-dicyclohexyl-2,6-naphthalenedicarboxyamide, N,N'-dicyclohexyl terephthalamide, N , N'-diphenylhexanediamide, and more preferably N,N'-dicyclohexyl-2,6-naphthalene dicarboxyamide. Commercially available products of N,N'-dicyclohexyl-2,6-naphthalenedicarboxyamide include, for example, NU-100 (manufactured by Shin Nippon Chemical Co., Ltd.).
　β晶核剤の濃度は、耐レトルト融着性に優れるという観点から、好ましくは１００質量ｐｐｍ以上３０００質量ｐｐｍ以下であり、より好ましくは３００質量ｐｐｍ以上２０００質量ｐｐｍ以下であり、さらに好ましくは３００質量ｐｐｍ以上１５００質量ｐｐｍ以下であり、特に好ましくは５００質量ｐｐｍ以上１５００質量ｐｐｍ以下である。 From the viewpoint of excellent retort fusion resistance, the concentration of the β-crystal nucleating agent is preferably 100 mass ppm or more and 3000 mass ppm or less, more preferably 300 mass ppm or more and 2000 mass ppm or less, and still more preferably 300 mass ppm or more and 3000 mass ppm or less. The content ranges from 500 ppm to 1500 ppm by mass, particularly preferably from 500 ppm to 1500 ppm by mass.
　本実施形態に係るシーラントフィルム用樹脂組成物は、必要に応じて、添加剤やその他の樹脂を含有してもよい。添加剤としては、例えば、酸化防止剤、中和剤、紫外線吸収剤、帯電防止剤、滑剤、造核剤、粘着剤、防曇剤、アンチブロッキング剤、メルトフローレート調整剤などが挙げられる。酸化防止剤としては、例えば、フェノール系酸化防止剤、リン系酸化防止剤、イオウ系酸化防止剤などが挙げられ、１分子中にフェノール系の酸化防止機構とリン系の酸化防止機構とを併せ持つユニットを有する複合型の酸化防止剤も用いることができる。その他の樹脂としては、例えば、スチレン－ブタジエン－スチレン共重合体、スチレン－イソプレン－スチレン共重合体を水添したスチレン系共重合体ゴムなどのエラストマーが挙げられる。 The resin composition for sealant film according to the present embodiment may contain additives and other resins as necessary. Examples of additives include antioxidants, neutralizers, ultraviolet absorbers, antistatic agents, lubricants, nucleating agents, adhesives, antifogging agents, antiblocking agents, melt flow rate regulators, and the like. Examples of antioxidants include phenolic antioxidants, phosphorous antioxidants, sulfur-based antioxidants, etc., which have both a phenol-based antioxidant mechanism and a phosphorus-based antioxidant mechanism in one molecule. Complex type antioxidants having units can also be used. Examples of other resins include elastomers such as styrene-butadiene-styrene copolymer and styrene copolymer rubber obtained by hydrogenating styrene-isoprene-styrene copolymer.
　本実施形態に係るシーラントフィルム用樹脂組成物は、前記樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、プロピレン系重合体（１）の含有量が、好ましくは５０質量部以上９５質量部以下であり、より好ましくは５０質量部以上８９質量部未満であり、さらに好ましくは６０質量部以上８９質量部未満であり、特に好ましくは６０質量部以上８０質量部以下である。また、前記樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、プロピレン系共重合体（２）の含有量が、好ましくは５質量部以上５０質量部以下であり、より好ましくは１１質量部超５０質量部以下であり、さらに好ましくは１１質量部超４０質量部以下であり、特に好ましくは２０質量部以上４０質量部以下である。 In the resin composition for a sealant film according to the present embodiment, the content of the propylene polymer (1) is preferably set to 100 parts by mass in total of the content of the polymers contained in the resin composition. 50 parts by mass or more and 95 parts by mass or less, more preferably 50 parts by mass or more and less than 89 parts by mass, even more preferably 60 parts by mass or more and less than 89 parts by mass, particularly preferably 60 parts by mass or more and less than 80 parts by mass. It is. Further, the content of the propylene copolymer (2) is preferably 5 parts by mass or more and 50 parts by mass or less with respect to a total of 100 parts by mass of the polymers contained in the resin composition. , more preferably more than 11 parts by weight and not more than 50 parts by weight, still more preferably more than 11 parts by weight and not more than 40 parts by weight, particularly preferably not less than 20 parts by weight and not more than 40 parts by weight.
　本実施形態に係るシーラントフィルム用樹脂組成物の一態様として、耐レトルト融着性により優れ、耐破袋性に優れるという観点から、該樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、好ましくは、前記プロピレン系重合体（１）の含有量が５０質量部以上９５質量部以下であり、前記プロピレン系共重合体（２）の含有量が５質量部以上５０質量部以下であり、より好ましくは、前記プロピレン系重合体（１）の含有量が５０質量部以上８９質量部未満であり、前記プロピレン系共重合体（２）の含有量が１１質量部超５０質量部以下である。 As one aspect of the resin composition for a sealant film according to the present embodiment, from the viewpoint of having excellent retort fusion resistance and excellent bag breakage resistance, the total content of polymers contained in the resin composition is Preferably, the content of the propylene polymer (1) is 50 parts by mass or more and 95 parts by mass or less, and the content of the propylene copolymer (2) is 5 parts by mass or more with respect to 100 parts by mass. 50 parts by mass or less, more preferably, the content of the propylene polymer (1) is 50 parts by mass or more and less than 89 parts by mass, and the content of the propylene copolymer (2) is 11 parts by mass. More than 50 parts by mass or less.
　本実施形態に係るシーラントフィルム用樹脂組成物がプロピレン系共重合体（３）を含有する場合、前記樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、プロピレン系重合体（１）の含有量が、好ましくは１０質量部以上７８質量部以下であり、より好ましくは１０質量部以上７０質量部以下であり、さらに好ましくは２０質量部以上６０質量部以下であり、特に好ましくは２０質量部以上５０質量部以下であり、プロピレン系共重合体（２）の含有量が、好ましくは２質量部以上４０質量部以下であり、より好ましくは５質量部以上４０質量部以下であり、さらに好ましくは５質量部以上３５質量部以下であり、特に好ましくは５質量部以上３０質量部以下であり、プロピレン系共重合体（３）の含有量が、好ましくは２０質量部以上８０質量部以下であり、より好ましくは２０質量部以上７０質量部以下であり、さらに好ましくは３０質量部以上７０質量部以下であり、特に好ましくは３５質量部以上６５質量部以下である。本実施形態に係るシーラントフィルム用樹脂組成物の一態様として、耐レトルト融着性により優れ、低温でのヒートシール強度に優れるという観点から、好ましくは、該樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、プロピレン系重合体（１）の含有量が１０質量部以上７８質量部以下であり、プロピレン系共重合体（２）の含有量が２質量部以上４０質量部以下であり、プロピレン系共重合体（３）の含有量が２０質量部以上８０質量部以下である。 When the resin composition for a sealant film according to the present embodiment contains a propylene-based copolymer (3), the propylene-based copolymer (3) is The content of the polymer (1) is preferably 10 parts by mass or more and 78 parts by mass or less, more preferably 10 parts by mass or more and 70 parts by mass or less, and even more preferably 20 parts by mass or more and 60 parts by mass or less. , particularly preferably 20 parts by mass or more and 50 parts by mass or less, and the content of the propylene copolymer (2) is preferably 2 parts by mass or more and 40 parts by mass or less, more preferably 5 parts by mass or more and 40 parts by mass. parts by weight or less, more preferably 5 parts by weight or more and 35 parts by weight or less, particularly preferably 5 parts by weight or more and 30 parts by weight or less, and the content of the propylene copolymer (3) is preferably 20 parts by weight. parts to 80 parts by mass, more preferably 20 parts to 70 parts by mass, still more preferably 30 parts to 70 parts by mass, particularly preferably 35 parts to 65 parts by mass. . As one aspect of the resin composition for a sealant film according to the present embodiment, from the viewpoint of excellent retort fusion resistance and heat sealing strength at low temperatures, it is preferable to use a polymer contained in the resin composition. The content of the propylene polymer (1) is 10 parts by mass or more and 78 parts by mass or less, and the content of the propylene copolymer (2) is 2 parts by mass or more with respect to the total content of 100 parts by mass. The content of the propylene copolymer (3) is 20 parts by mass or more and 80 parts by mass or less.
　本実施形態に係るシーラントフィルム用樹脂組成物がエチレン系共重合体を含有する場合、該樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、プロピレン系重合体（１）の含有量が、好ましくは３５質量部以上７５質量部以下であり、より好ましくは４０質量部以上７５質量部以下であり、さらに好ましくは４０質量部以上７０質量部以下であり、特に好ましくは４５質量部以上７０質量部以下であり、プロピレン系共重合体（２）の含有量が、好ましくは５質量部以上５０質量部以下であり、より好ましくは５質量部以上４５質量部以下であり、さらに好ましくは１０質量部以上４５質量部以下であり、特に好ましくは１０質量部以上４０質量部以下であり、エチレン系共重合体の含有量が、好ましくは２質量部以上３０質量部以下であり、より好ましくは５質量部以上３０質量部以下であり、さらに好ましくは１０質量部以上３０質量部以下であり、特に好ましくは１５質量部以上３０質量部以下である。本実施形態に係るシーラントフィルム用樹脂組成物の一態様として、耐レトルト融着性により優れ、耐破袋性に優れるという観点から、好ましくは、該樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、プロピレン系重合体（１）の含有量が３５質量部以上７５質量部以下であり、プロピレン系共重合体（２）の含有量が５質量部以上５０質量部以下であり、エチレン系共重合体の含有量が２質量部以上３０質量部以下である。 When the resin composition for a sealant film according to the present embodiment contains an ethylene-based copolymer, the propylene-based polymer ( The content of 1) is preferably 35 parts by mass or more and 75 parts by mass or less, more preferably 40 parts by mass or more and 75 parts by mass or less, still more preferably 40 parts by mass or more and 70 parts by mass or less, and particularly preferably is 45 parts by mass or more and 70 parts by mass or less, and the content of the propylene copolymer (2) is preferably 5 parts by mass or more and 50 parts by mass or less, more preferably 5 parts by mass or more and 45 parts by mass or less. The content of the ethylene copolymer is preferably 10 parts by mass or more and 45 parts by mass or less, particularly preferably 10 parts by mass or more and 40 parts by mass or less, and the content of the ethylene copolymer is preferably 2 parts by mass or more and 30 parts by mass or less. It is more preferably 5 parts by mass or more and 30 parts by mass or less, still more preferably 10 parts by mass or more and 30 parts by mass or less, particularly preferably 15 parts by mass or more and 30 parts by mass or less. As one aspect of the resin composition for a sealant film according to the present embodiment, from the viewpoint of excellent retort fusion resistance and excellent bag breakage resistance, the resin composition preferably contains a polymer contained in the resin composition. With respect to a total of 100 parts by mass, the content of propylene polymer (1) is 35 parts by mass or more and 75 parts by mass or less, and the content of propylene copolymer (2) is 5 parts by mass or more and 50 parts by mass. The content of the ethylene copolymer is 2 parts by mass or more and 30 parts by mass or less.
　＜シーラントフィルム＞
　本実施形態に係るシーラントフィルムは、上記のシーラントフィルム用樹脂組成物を含有する。 <Sealant film>
The sealant film according to this embodiment contains the above resin composition for sealant film.
　前記シーラントフィルムの厚さは、好ましくは５μｍ以上２００μｍ以下であり、より好ましくは３０μｍ以上１５０μｍ以下である。 The thickness of the sealant film is preferably 5 μm or more and 200 μm or less, more preferably 30 μm or more and 150 μm or less.
　＜多層フィルム＞
　本実施形態に係る多層フィルムは、上記シーラントフィルムをシーラント層として備える。 <Multilayer film>
The multilayer film according to this embodiment includes the above sealant film as a sealant layer.
　前記多層フィルムの厚さは、好ましくは５μｍ以上５００μｍ以下であり、より好ましくは３０μｍ以上１５０μｍ以下である。 The thickness of the multilayer film is preferably 5 μm or more and 500 μm or less, more preferably 30 μm or more and 150 μm or less.
　前記多層フィルムの用途としては、例えば、食品、繊維、雑貨などの包装用途が挙げられる。前記多層フィルムは、好ましくは、レトルト食品包装に用いられる多層フィルムである。また、多層フィルムは、包装袋を形成する材料として用いられてもよい。 Applications of the multilayer film include, for example, packaging applications for foods, textiles, miscellaneous goods, and the like. The multilayer film is preferably a multilayer film used for retort food packaging. The multilayer film may also be used as a material for forming packaging bags.
　前記多層フィルムは、上記シーラントフィルムをシーラント層として、基材層と積層することにより製造することができる。基材層とシーラント層とを積層する方法としては、例えば、Ｔダイ法、チューブラー法などの公知のフィルム製造方法が挙げられ、好ましくはＴダイ法である。 The multilayer film can be produced by laminating the sealant film as a sealant layer with a base layer. Examples of the method for laminating the base material layer and the sealant layer include known film manufacturing methods such as the T-die method and the tubular method, with the T-die method being preferred.
　＜シーラントフィルムの製造方法＞
　本実施形態に係るシーラントフィルムの製造方法は、上記シーラントフィルム用樹脂組成物を溶融混練する溶融混練工程と、溶融混練された組成物を押し出す押出工程と、押し出された組成物を厚さ５μｍ以上２００μｍ以下に製膜する製膜工程と、を含む。 <Method for manufacturing sealant film>
The method for producing a sealant film according to the present embodiment includes a melt-kneading step of melt-kneading the resin composition for sealant film, an extrusion step of extruding the melt-kneaded composition, and a step of extruding the extruded composition to a thickness of 5 μm or more. A film forming step of forming a film to a thickness of 200 μm or less is included.
　前記溶融混練工程では、プロピレン系重合体（１）と、プロピレン系共重合体（２）と、β晶核剤と、必要に応じて、プロピレン系共重合体（３）と、エチレン系共重合体と、添加剤やその他の樹脂と、を溶融混練する。なお、プロピレン系重合体（１）およびプロピレン系共重合体（２）としては、多段階で重合して得られたプロピレン系多段重合体を用いてもよい。 In the melt-kneading step, the propylene polymer (1), the propylene copolymer (2), the β-crystal nucleating agent, and if necessary, the propylene copolymer (3) and the ethylene copolymer The mixture, additives and other resins are melt-kneaded. Note that as the propylene polymer (1) and the propylene copolymer (2), a propylene multistage polymer obtained by polymerization in multiple stages may be used.
　溶融混練を行う方法としては、従来公知の方法および装置を用いて行うことができる。例えば、上記の各材料を、ヘンシェルミキサー、リボンブレンダー、タンブルミキサーなどの混合装置を用いて混合した後、溶融混練する方法が挙げられる。また、定量供給機を用いて、一定の割合で上記の各材料をそれぞれ連続的に供給することによって均質な混合物を得た後、該混合物を、単軸または二軸以上の押出機、バンバリーミキサー、ロール式混練機などを用いて、溶融混練する方法が挙げられる。 The melt-kneading can be carried out using conventionally known methods and equipment. For example, the above-mentioned materials may be mixed using a mixing device such as a Henschel mixer, a ribbon blender, or a tumble mixer, and then melt-kneaded. In addition, after obtaining a homogeneous mixture by continuously feeding each of the above materials at a fixed rate using a quantitative feeder, the mixture is transferred to a single screw or two or more screw extruder, a Banbury mixer, etc. , a method of melt-kneading using a roll-type kneader or the like.
　溶融混練時の樹脂温度は、好ましくは１９０℃以上３２０℃以下であり、より好ましくは２１０℃以上２８０℃以下である。 The resin temperature during melt-kneading is preferably 190°C or higher and 320°C or lower, more preferably 210°C or higher and 280°C or lower.
　前記押出工程では、例えば、溶融混練された組成物を、押出機を用いてＴダイより押し出す。押出温度は、例えば、１９０℃以上３２０℃以下とすることができる。なお、押出温度は、Ｔダイ自体の温度である。 In the extrusion step, for example, the melt-kneaded composition is extruded from a T-die using an extruder. The extrusion temperature can be, for example, 190°C or higher and 320°C or lower. Note that the extrusion temperature is the temperature of the T-die itself.
　前記製膜工程では、例えば、Ｔダイから押し出された組成物を、チルロールで巻き取りながら冷却固化させ、所定の厚さに製膜する。冷却温度は、例えば、２０℃以上１４０℃以下とすることができる。 In the film forming step, for example, the composition extruded from a T-die is cooled and solidified while being wound up with a chill roll to form a film to a predetermined thickness. The cooling temperature can be, for example, 20° C. or higher and 140° C. or lower.
　なお、本実施形態に係るシーラントフィルム用樹脂組成物、シーラントフィルム、多層フィルム、および、シーラントフィルムの製造方法は、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変更が可能である。 Note that the resin composition for sealant film, the sealant film, the multilayer film, and the method for manufacturing the sealant film according to the present embodiment are not limited to the above embodiments, and various methods may be used without departing from the gist of the present invention. can be changed.
　以下、実施例および比較例を用いて本発明をさらに具体的に説明するが、本発明は、以下の実施例に限定されるものではない。 Hereinafter, the present invention will be explained in more detail using Examples and Comparative Examples, but the present invention is not limited to the following Examples.
　実施例および比較例における各項目の測定値は、下記の方法で測定した。 The measured values for each item in the Examples and Comparative Examples were measured by the following method.
（１）１３Ｃ－ＮＭＲ
　プロピレン系重合体組成物に含有されるプロピレン単独重合体およびプロピレン－エチレン共重合体の含有量は、１３Ｃ－ＮＭＲにより測定した。 (1) 13C -NMR
The content of propylene homopolymer and propylene-ethylene copolymer contained in the propylene-based polymer composition was measured by 13 C-NMR.
　プロピレン系重合体組成物において、プロピレン－エチレン共重合体に含まれるエチレンに由来する構造単位の含有量は、１３Ｃ－ＮＭＲにより測定した。 In the propylene polymer composition, the content of structural units derived from ethylene contained in the propylene-ethylene copolymer was measured by 13 C-NMR.
　具体的には、下記の条件で測定したプロピレン系重合体組成物の１３Ｃ－ＮＭＲスペクトルから、Ｋａｋｕｇｏらの報告（Ｍａｃｒｏｍｏｌｅｃｕｌｅｓ　１９８２，１５，１１５０－１１５２）に基づいて、プロピレン系重合体組成物に含有されるプロピレン－エチレン共重合体の含有量と、プロピレン系重合体組成物においてプロピレン－エチレン共重合体に含まれるエチレンに由来する構造単位の含有量を求めた。 Specifically, from the 13 C-NMR spectrum of the propylene polymer composition measured under the following conditions, based on the report by Kakugo et al. (Macromolecules 1982, 15, 1150-1152), the propylene polymer composition The content of the propylene-ethylene copolymer contained and the content of structural units derived from ethylene contained in the propylene-ethylene copolymer in the propylene-based polymer composition were determined.
　エチレン系重合体組成物において、エチレン系共重合体に含まれるエチレンに由来する構造単位の含有量は、１３Ｃ－ＮＭＲにより測定した。具体的には、下記の条件で測定したエチレン系重合体組成物の１３Ｃ－ＮＭＲスペクトルから、Ｒａｎｄａｌｌの方法（Ｒｅｖ．Ｍａｃｒｏｍｏｌ．Ｃｈｅｍ．Ｐｈｙｓ．,Ｃ２９（２＆３）に基づいて、エチレン系共重合体に含まれるエチレンに由来する構造単位の含有量を求めた。 In the ethylene polymer composition, the content of structural units derived from ethylene contained in the ethylene copolymer was measured by 13 C-NMR. Specifically, based on the 13 C-NMR spectrum of the ethylene polymer composition measured under the following conditions, the ethylene copolymer composition was determined based on Randall's method (Rev. Macromol. The content of structural units derived from ethylene contained in the coalescence was determined.
　１０ｍｍφの試験管中で約２５０ｍｇのプロピレン系重合体組成物またはエチレン系重合体組成物を溶媒２．５ｍＬに均一に溶解させて試料を調整し、その試料の１３Ｃ―ＮＭＲスペクトルを下記の条件下で測定した。

　・機種：Ｂｒｕｋｅｒ　ＡＶＡＮＣＥ６００
　・プローブ：１０ｍｍクライオプローブ
　・測定方法：プロトンデカップリング法
　・測定温度：１３５℃
　・測定溶媒：１，２－ジクロロベンゼン／テトラクロロエタン－ｄ２＝８５／１５
　・パルス繰り返し時間：４秒
　・パルス幅：４５°
　・積算回数：２５６回
　・磁場強度：６００ＭＨｚ
A sample was prepared by uniformly dissolving approximately 250 mg of the propylene polymer composition or ethylene polymer composition in 2.5 mL of solvent in a 10 mmφ test tube, and the 13 C-NMR spectrum of the sample was measured under the following conditions. Measured below.

・Model: Bruker AVANCE600
・Probe: 10mm cryoprobe ・Measurement method: Proton decoupling method ・Measurement temperature: 135℃
・Measurement solvent: 1,2-dichlorobenzene/tetrachloroethane-d2=85/15
・Pulse repetition time: 4 seconds ・Pulse width: 45°
・Number of integration: 256 times ・Magnetic field strength: 600MHz
（２）メルトフローレート（ＭＦＲ、単位：ｇ／１０分）
　メルトフローレートは、ＪＩＳ　Ｋ７２１０－１に規定されたＡ法に従って、温度２３０℃または１９０℃、荷重２．１６ｋｇで測定した。 (2) Melt flow rate (MFR, unit: g/10 minutes)
The melt flow rate was measured at a temperature of 230° C. or 190° C. and a load of 2.16 kg according to method A specified in JIS K7210-1.
（３）密度（単位：ｋｇ／ｍ３）
　エチレン系重合体組成物の密度は、ＪＩＳ　Ｋ６９２２－１に従って測定した。 (3) Density (unit: kg/m 3 )
The density of the ethylene polymer composition was measured according to JIS K6922-1.
（４）ヒートシール強度（単位：Ｎ／１５ｍｍ）
　シーラントフィルムと、厚さ７μｍのアルミ箔と、厚さ１２μｍのポリエチレンテレフタラートフィルムとを、この記載の順でドライラミネート法により積層した多層フィルムを用いた。東洋テスター工業株式会社製ヒートシーラーを使用して、多層フィルムをシーラントフィルムが内側となるように二つに折り返し、折り返し位置と対向する側の端部同士を、下記条件で、折り返し位置の延びる方向に沿って、帯状にヒートシールした。

　・シールバー：平面両面加熱
　・シール温度：１７０℃
　・シール圧力：１．０ｋｇ／ｃｍ２
　・シール時間：１．０ｓｅｃ
　・シール幅：１０ｍｍ

　そして、シール幅方向に対して直角方向に１５ｍｍ幅の試験片を切り出し、１２０℃のオーブン内で３０分間熱処理した。その後、引張試験機（オリエンテック製テンシロン）を使用して、剥離角９０°、引張速度２００ｍｍ／ｍｉｎの条件で試験片のヒートシール強度を測定した。 (4) Heat seal strength (unit: N/15mm)
A multilayer film was used in which a sealant film, a 7 μm thick aluminum foil, and a 12 μm thick polyethylene terephthalate film were laminated in the stated order by a dry lamination method. Using a heat sealer manufactured by Toyo Tester Kogyo Co., Ltd., fold the multilayer film in half with the sealant film on the inside, and then fold the ends opposite the folded position in the direction in which the folded position extends under the following conditions. It was heat-sealed in a strip along the .

・Seal bar: Double-sided flat surface heating ・Seal temperature: 170℃
・Seal pressure: 1.0kg/ cm2
・Sealing time: 1.0sec
・Seal width: 10mm

Then, a test piece with a width of 15 mm was cut out in a direction perpendicular to the seal width direction, and heat treated in an oven at 120° C. for 30 minutes. Thereafter, the heat seal strength of the test piece was measured using a tensile tester (Tensilon manufactured by Orientec) under conditions of a peel angle of 90° and a tensile speed of 200 mm/min.
（５）耐レトルト融着性評価（単位：Ｎ／１２ｃｍ２）
　１００ｍｍ×３０ｍｍのシーラントフィルム２枚の測定面同士を重ね合わせた後、接地面積４０ｍｍ×３０ｍｍで重量５００ｇの錘をのせ、１２０℃のオーブン内で３０分間熱処理した。得られたシーラントフィルム２枚の積層体を、温度２３℃、湿度５０％の雰囲気下に３０分以上放置した後、２００ｍｍ／分の引張速度で剪断剥離力を測定した。 (5) Retort fusion resistance evaluation (unit: N/12cm 2 )
After the measurement surfaces of two 100 mm x 30 mm sealant films were placed on top of each other, a weight of 500 g with a ground contact area of 40 mm x 30 mm was placed on the film, and the film was heat-treated in an oven at 120° C. for 30 minutes. The resulting laminate of two sealant films was left in an atmosphere at a temperature of 23° C. and a humidity of 50% for 30 minutes or more, and then the shear peeling force was measured at a tensile rate of 200 mm/min.
　実施例および比較例で用いた各成分は以下の通りである。 The components used in the Examples and Comparative Examples are as follows.
［プロピレン系重合体組成物Ａ］
　チーグラー・ナッタ型触媒を用いて、第一工程では、気相中でプロピレンを重合し、次いで、第二工程では、気相中でプロピレンとエチレンとを共重合し、プロピレン単独重合体Ａ－１とプロピレン－エチレン共重合体Ａ－２とからなるプロピレン系重合体組成物Ａを得た。 [Propylene polymer composition A]
Using a Ziegler-Natta type catalyst, in the first step, propylene is polymerized in the gas phase, and in the second step, propylene and ethylene are copolymerized in the gas phase to produce propylene homopolymer A-1. and propylene-ethylene copolymer A-2 was obtained.
［プロピレン系重合体組成物Ｂ］
　チーグラー・ナッタ型触媒を用いて、第一工程では、気相中でプロピレンを重合し、次いで、第二工程では、気相中でプロピレンとエチレンとを共重合し、プロピレン単独重合体Ｂ－１とプロピレン－エチレン共重合体Ｂ－２とからなるプロピレン系重合体組成物Ｂを得た。 [Propylene polymer composition B]
Using a Ziegler-Natta type catalyst, propylene is polymerized in the gas phase in the first step, and propylene and ethylene are copolymerized in the gas phase in the second step to produce propylene homopolymer B-1. and propylene-ethylene copolymer B-2 was obtained.
［プロピレン系重合体組成物Ｃ］
　チーグラー・ナッタ型触媒を用いて、第一工程では、気相中でプロピレンを重合し、次いで、第二工程では、気相中でプロピレンとエチレンとを共重合し、プロピレン単独重合体Ｃ－１とプロピレン－エチレン共重合体Ｃ－２とからなるプロピレン系重合体組成物Ｃを得た。 [Propylene polymer composition C]
In the first step, propylene is polymerized in the gas phase using a Ziegler-Natta type catalyst, and in the second step, propylene and ethylene are copolymerized in the gas phase to produce propylene homopolymer C-1. and propylene-ethylene copolymer C-2 was obtained.
［プロピレン系重合体組成物Ｄ］
　チーグラー・ナッタ型触媒を用いて、第一工程では、気相中でプロピレンを重合し、次いで、第二工程では、気相中でプロピレンとエチレンとを共重合し、プロピレン単独重合体Ｄ－１とプロピレン－エチレン共重合体Ｄ－２とからなるプロピレン系重合体組成物Ｄを得た。 [Propylene polymer composition D]
Using a Ziegler-Natta type catalyst, propylene is polymerized in the gas phase in the first step, and propylene and ethylene are copolymerized in the gas phase in the second step to produce propylene homopolymer D-1. A propylene polymer composition D was obtained, which consisted of the following: and propylene-ethylene copolymer D-2.
［プロピレン単独重合体Ｅ］
　チーグラー・ナッタ型触媒を用いて、プロピレンを重合し、プロピレン単独重合体Ｅを得た。 [Propylene homopolymer E]
Propylene was polymerized using a Ziegler-Natta type catalyst to obtain propylene homopolymer E.
［プロピレン単独重合体Ｆ］
　チーグラー・ナッタ型触媒を用いて、プロピレンを重合し、プロピレン単独重合体Ｆを得た。 [Propylene homopolymer F]
Propylene was polymerized using a Ziegler-Natta type catalyst to obtain a propylene homopolymer F.
［プロピレン系重合体組成物Ｇ］
　チーグラー・ナッタ型触媒を用いて、気相中でプロピレンとエチレンとを共重合し、プロピレン－エチレン共重合体Ｇを得た。
　得られたプロピレン－エチレン共重合体Ｇ　１００質量部に対して、ステアリン酸カルシウム０．０５質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．２質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、および、メルトフローレート調整剤として２，５－ジメチル－２，５ジ（ターシャリ－ブチルパーオキシ）ヘキサン適量をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状のプロピレン系重合体組成物Ｇを得た。得られたペレット状のプロピレン系重合体組成物Ｇは、プロピレン－エチレン共重合体Ｇにおけるエチレンに由来する構造単位の含有量が５．９質量％であり、２３０℃で測定したメルトフローレートが３．５ｇ／１０分であった。 [Propylene polymer composition G]
Propylene and ethylene were copolymerized in the gas phase using a Ziegler-Natta type catalyst to obtain propylene-ethylene copolymer G.
Based on 100 parts by mass of the obtained propylene-ethylene copolymer G, 0.05 parts by mass of calcium stearate, 0.2 parts by mass of Irganox 1010 (manufactured by BASF), and 0.05 parts by mass of Irgafos 168 (manufactured by BASF). and an appropriate amount of 2,5-dimethyl-2,5-di(tertiary-butylperoxy)hexane as a melt flow rate regulator were mixed in a Henschel mixer, followed by melt extrusion to obtain a pellet-like propylene polymer composition. I got item G. The resulting pellet-shaped propylene polymer composition G has a content of structural units derived from ethylene in the propylene-ethylene copolymer G of 5.9% by mass, and a melt flow rate measured at 230°C. It was 3.5g/10 minutes.
［エチレン系重合体組成物Ｈ］
　エチレン系重合体組成物Ｈとして、スミカセンＥ　ＦＶ２０５（エチレン－１－ヘキセン共重合体組成物、住友化学株式会社製）を用いた。エチレン系重合体組成物Ｈは、エチレン－１－ヘキセン共重合体の含有量が９９．９質量％であり、エチレン－１－ヘキセン共重合体におけるエチレンに由来する構造単位の含有量が９３質量％であり、１－ヘキセンに由来する構造単位の含有量が７質量％であり、１９０℃で測定したメルトフローレートが２．２ｇ／１０分であり、密度が９２１ｋｇ／ｍ３であった。 [Ethylene polymer composition H]
As the ethylene polymer composition H, Sumikasen E FV205 (ethylene-1-hexene copolymer composition, manufactured by Sumitomo Chemical Co., Ltd.) was used. Ethylene-based polymer composition H has an ethylene-1-hexene copolymer content of 99.9% by mass, and a content of ethylene-derived structural units in the ethylene-1-hexene copolymer of 93% by mass. %, the content of structural units derived from 1-hexene was 7% by mass, the melt flow rate measured at 190° C. was 2.2 g/10 minutes, and the density was 921 kg/m 3 .
［実施例１：樹脂組成物１］
　プロピレン系重合体組成物Ａ　１００質量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＮＵ－１００（β晶核剤、新日本理化株式会社製）０．０３質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物１を得た。得られた樹脂組成物１は、樹脂組成物１中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ａ－１の含有量が７８質量部であり、プロピレン－エチレン共重合体Ａ－２の含有量が２２質量部であり、プロピレン－エチレン共重合体Ａ－２におけるエチレンに由来する構造単位の含有量が３４質量％であり、２３０℃で測定したメルトフローレートが２．４ｇ／１０分であった。結果を表１に示す。 [Example 1: Resin composition 1]
For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.03 parts by mass of NU-100 (β crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 1. Ta. The obtained resin composition 1 has a content of propylene homopolymer A-1 of 78 parts by mass with respect to a total of 100 parts by mass of the content of polymers contained in resin composition 1, and propylene - The content of ethylene copolymer A-2 is 22 parts by mass, the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%, and the melt measured at 230 ° C. The flow rate was 2.4 g/10 minutes. The results are shown in Table 1.
　５０ｍｍＴダイ製膜装置（田辺プラスチックス社製Ｖ－５０－Ｆ６００型フィルム成型装置、４００ｍｍ幅Ｔダイ付き）を用いて、樹脂組成物１を樹脂温度２８０℃で溶融混練し、Ｔダイより押し出した。次いで、冷却温度８０℃のチルロール（冷却ロール）で巻き取りながら冷却固化させ、厚さ７０μｍのシーラントフィルムを得た。得られたシーラントフィルムを用いて耐レトルト融着性評価を行った。また、得られたシーラントフィルムを用いて作製した多層フィルムに対して、ヒートシール強度評価を行った。結果を表２に示す。 Resin composition 1 was melt-kneaded at a resin temperature of 280° C. using a 50 mm T-die film forming device (V-50-F600 type film forming device manufactured by Tanabe Plastics Co., Ltd., equipped with a 400 mm width T-die) and extruded from the T-die. . Next, the mixture was cooled and solidified while being wound around a chill roll having a cooling temperature of 80° C. to obtain a sealant film having a thickness of 70 μm. Retort fusion resistance was evaluated using the obtained sealant film. In addition, a heat seal strength evaluation was performed on a multilayer film produced using the obtained sealant film. The results are shown in Table 2.
［実施例２：樹脂組成物２］
　プロピレン系重合体組成物Ａ　１００質量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＮＵ－１００（β晶核剤、新日本理化株式会社製）０．１質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物２を得た。得られた樹脂組成物２は、樹脂組成物２中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ａ－１の含有量が７７質量部であり、プロピレン－エチレン共重合体Ａ－２の含有量が２３質量部であり、プロピレン－エチレン共重合体Ａ－２におけるエチレンに由来する構造単位の含有量が３４質量％であり、２３０℃で測定したメルトフローレートが２．５ｇ／１０分であった。結果を表１に示す。 [Example 2: Resin composition 2]
For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) 0.05 parts by mass and 0.1 parts by mass of NU-100 (β crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 2. Ta. The resulting resin composition 2 has a propylene homopolymer A-1 content of 77 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 2, and propylene - The content of ethylene copolymer A-2 is 23 parts by mass, the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%, and the melt measured at 230 ° C. The flow rate was 2.5 g/10 minutes. The results are shown in Table 1.
　樹脂組成物２を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that Resin Composition 2 was used, and its properties were evaluated. The results are shown in Table 2.
［実施例３：樹脂組成物３］
　プロピレン系重合体組成物Ａ　１００質量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＮＵ－１００（β晶核剤、新日本理化株式会社製）０．２質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物３を得た。得られた樹脂組成物３は、樹脂組成物３中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ａ－１の含有量が７８質量部であり、プロピレン－エチレン共重合体Ａ－２の含有量が２２質量部であり、プロピレン－エチレン共重合体Ａ－２におけるエチレンに由来する構造単位の含有量が３４質量％であり、２３０℃で測定したメルトフローレートが２．３ｇ／１０分であった。結果を表１に示す。 [Example 3: Resin composition 3]
For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.2 parts by mass of NU-100 (β crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 3. Ta. The resulting resin composition 3 has a content of propylene homopolymer A-1 of 78 parts by mass with respect to a total of 100 parts by mass of the content of polymers contained in resin composition 3, and propylene - The content of ethylene copolymer A-2 is 22 parts by mass, the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%, and the melt measured at 230 ° C. The flow rate was 2.3 g/10 minutes. The results are shown in Table 1.
　樹脂組成物３を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition 3 was used, and its properties were evaluated. The results are shown in Table 2.
［実施例４：樹脂組成物４］
　樹脂組成物３　５０質量％とプロピレン系重合体組成物Ｇ　５０質量％とをペレットブレンドして、樹脂組成物４を得た。結果を表１に示す。 [Example 4: Resin composition 4]
Resin composition 4 was obtained by pellet blending 50% by mass of resin composition 3 and 50% by mass of propylene polymer composition G. The results are shown in Table 1.
　樹脂組成物４を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition 4 was used, and its properties were evaluated. The results are shown in Table 2.
［実施例５：樹脂組成物５］
　樹脂組成物２　８０質量％とエチレン系重合体組成物Ｈ　２０質量％とをペレットブレンドして、樹脂組成物５を得た。結果を表１に示す。 [Example 5: Resin composition 5]
Resin composition 5 was obtained by pellet blending 80% by mass of resin composition 2 and 20% by mass of ethylene polymer composition H. The results are shown in Table 1.
　樹脂組成物５を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition 5 was used, and its properties were evaluated. The results are shown in Table 2.
［実施例６：樹脂組成物６］
　プロピレン系重合体組成物Ｂ　１００質量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＮＵ－１００（β晶核剤、新日本理化株式会社製）０．１質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物６を得た。得られた樹脂組成物６は、樹脂組成物６中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ｂ－１の含有量が８４質量部であり、プロピレン－エチレン共重合体Ｂ－２の含有量が１６質量部であり、プロピレン－エチレン共重合体Ｂ－２におけるエチレンに由来する構造単位の含有量が５５質量％であり、２３０℃で測定したメルトフローレートが２２ｇ／１０分であった。結果を表１に示す。 [Example 6: Resin composition 6]
For 100 parts by mass of propylene polymer composition B, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.1 part by mass of NU-100 (β crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 6. Ta. The resulting resin composition 6 has a propylene homopolymer B-1 content of 84 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 6, and propylene - The content of ethylene copolymer B-2 is 16 parts by mass, the content of structural units derived from ethylene in propylene-ethylene copolymer B-2 is 55% by mass, and the melt measured at 230 ° C. The flow rate was 22 g/10 minutes. The results are shown in Table 1.
　樹脂組成物６を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition 6 was used, and its properties were evaluated. The results are shown in Table 2.
［実施例７：樹脂組成物７］
　プロピレン系重合体組成物Ｃ　１００質量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＮＵ－１００（β晶核剤、新日本理化株式会社製）０．１質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物７を得た。得られた樹脂組成物７は、樹脂組成物７中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ｃ－１の含有量が８０質量部であり、プロピレン－エチレン共重合体Ｃ－２の含有量が２０質量部であり、プロピレン－エチレン共重合体Ｃ－２におけるエチレンに由来する構造単位の含有量が５１質量％であり、２３０℃で測定したメルトフローレートが６．５ｇ／１０分であった。結果を表１に示す。 [Example 7: Resin composition 7]
For 100 parts by mass of propylene polymer composition C, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.1 part by mass of NU-100 (β crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 7. Ta. The resulting resin composition 7 has a propylene homopolymer C-1 content of 80 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 7, and propylene - The content of the ethylene copolymer C-2 is 20 parts by mass, the content of structural units derived from ethylene in the propylene-ethylene copolymer C-2 is 51% by mass, and the melt measured at 230 ° C. The flow rate was 6.5 g/10 minutes. The results are shown in Table 1.
　樹脂組成物７を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition 7 was used, and its properties were evaluated. The results are shown in Table 2.
［実施例８：樹脂組成物８］
　プロピレン系重合体組成物Ｄ　５５質量部とプロピレン単独重合体Ｅ　４５質量部とに対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＮＵ－１００（β晶核剤、新日本理化株式会社製）０．１質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物８を得た。得られた樹脂組成物８は、樹脂組成物８中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ｄ－１の含有量とプロピレン単独重合体Ｅの含有量の合計が８９質量部であり、プロピレン－エチレン共重合体Ｄ－２の含有量が１１質量部であり、プロピレン－エチレン共重合体Ｄ－２におけるエチレンに由来する構造単位の含有量が３９質量％であり、２３０℃で測定したメルトフローレートが２．７ｇ／１０分であった。結果を表１に示す。 [Example 8: Resin composition 8]
For 55 parts by mass of propylene polymer composition D and 45 parts by mass of propylene homopolymer E, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.) and 0.01 part by mass of Irganox 1010 (manufactured by BASF). After mixing 1 part by mass of Irgafos 168 (manufactured by BASF), 0.05 parts by mass of NU-100 (beta crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) in a Henschel mixer, melt extrusion was performed. A pellet-shaped resin composition 8 was obtained. The obtained resin composition 8 has a content of propylene homopolymer D-1 and a content of propylene homopolymer E based on a total of 100 parts by mass of the polymer content contained in resin composition 8. The total amount is 89 parts by mass, the content of propylene-ethylene copolymer D-2 is 11 parts by mass, and the content of structural units derived from ethylene in propylene-ethylene copolymer D-2 is 39 parts by mass. % by mass, and the melt flow rate measured at 230°C was 2.7 g/10 minutes. The results are shown in Table 1.
　樹脂組成物８を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition 8 was used, and its properties were evaluated. The results are shown in Table 2.
［実施例９：樹脂組成物９］
　プロピレン系重合体組成物Ａ　１００質量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＴＭＢ－５（β晶核剤、Shanxi Provincial Institute of Chemical Industry製）０．０３質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物９を得た。得られた樹脂組成物９は、樹脂組成物９中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ａ－１の含有量が７８質量部であり、プロピレン－エチレン共重合体Ａ－２の含有量が２２質量部であり、プロピレン－エチレン共重合体Ａ－２におけるエチレンに由来する構造単位の含有量が３４質量％であり、２３０℃で測定したメルトフローレートが２．４ｇ／１０分であった。結果を表１に示す。 [Example 9: Resin composition 9]
For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.03 parts by mass of TMB-5 (β crystal nucleating agent, manufactured by Shanxi Provincial Institute of Chemical Industry) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition 9. Obtained. The resulting resin composition 9 has a propylene homopolymer A-1 content of 78 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 9, and propylene - The content of ethylene copolymer A-2 is 22 parts by mass, the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%, and the melt measured at 230 ° C. The flow rate was 2.4 g/10 minutes. The results are shown in Table 1.
　樹脂組成物９を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition 9 was used, and its properties were evaluated. The results are shown in Table 2.
［実施例１０：樹脂組成物１０］
　プロピレン系重合体組成物Ａ　１００質量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＴＭＢ－５（β晶核剤、Shanxi Provincial Institute of Chemical Industry製）０．１質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物１０を得た。得られた樹脂組成物１０は、樹脂組成物１０中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ａ－１の含有量が７８質量部であり、プロピレン－エチレン共重合体Ａ－２の含有量が２２質量部であり、プロピレン－エチレン共重合体Ａ－２におけるエチレンに由来する構造単位の含有量が３４質量％であり、２３０℃で測定したメルトフローレートが２．４ｇ／１０分であった。結果を表１に示す。 [Example 10: Resin composition 10]
For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) and 0.1 part by mass of TMB-5 (β crystal nucleating agent, manufactured by Shanxi Provincial Institute of Chemical Industry) were mixed in a Henschel mixer, and melt extrusion was performed to obtain pellet-shaped resin composition 10. Obtained. The resulting resin composition 10 has a propylene homopolymer A-1 content of 78 parts by mass based on a total of 100 parts by mass of the polymers contained in the resin composition 10, and propylene homopolymer A-1. - The content of ethylene copolymer A-2 is 22 parts by mass, the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 34 mass%, and the melt measured at 230 ° C. The flow rate was 2.4 g/10 minutes. The results are shown in Table 1.
　樹脂組成物１０を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that Resin Composition 10 was used, and its properties were evaluated. The results are shown in Table 2.
［比較例１：樹脂組成物Ｃ１］
　プロピレン系重合体組成物Ａ　１００質量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物Ｃ１を得た。得られた樹脂組成物Ｃ１は、樹脂組成物Ｃ１中に含有される重合体の含有量の合計１００質量部に対して、プロピレン単独重合体Ａ－１の含有量が７８質量部であり、プロピレン－エチレン共重合体Ａ－２の含有量が２２質量部であり、プロピレン－エチレン共重合体Ａ－２におけるエチレンに由来する構造単位の含有量が３５質量％であり、２３０℃で測定したメルトフローレートが２．３ｇ／１０分であった。結果を表１に示す。 [Comparative Example 1: Resin composition C1]
For 100 parts by mass of propylene polymer composition A, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), Irgafos 168 (manufactured by BASF Corporation) ) 0.05 parts by mass were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition C1. The obtained resin composition C1 has a content of propylene homopolymer A-1 of 78 parts by mass with respect to a total content of 100 parts by mass of polymers contained in the resin composition C1, and propylene - The content of ethylene copolymer A-2 is 22 parts by mass, the content of structural units derived from ethylene in propylene-ethylene copolymer A-2 is 35% by mass, and the melt measured at 230 ° C. The flow rate was 2.3 g/10 minutes. The results are shown in Table 1.
　樹脂組成物Ｃ１を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition C1 was used, and its properties were evaluated. The results are shown in Table 2.
［比較例２：樹脂組成物Ｃ２］
　プロピレン単独重合体Ｆ　１００重量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物Ｃ２を得た。得られた樹脂組成物Ｃ２の２３０℃で測定したメルトフローレートは３．１ｇ／１０分であった。結果を表１に示す。 [Comparative Example 2: Resin composition C2]
For 100 parts by weight of propylene homopolymer F, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), 0.0 parts by mass of Irgafos 168 (manufactured by BASF Corporation) After mixing 0.05 parts by mass using a Henschel mixer, melt extrusion was performed to obtain pellet-shaped resin composition C2. The melt flow rate of the resulting resin composition C2 measured at 230°C was 3.1 g/10 minutes. The results are shown in Table 1.
　樹脂組成物Ｃ２を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition C2 was used, and its properties were evaluated. The results are shown in Table 2.
［比較例３：樹脂組成物Ｃ３］
　プロピレン単独重合体Ｆ　１００重量部に対して、ハイドロタルサイト（協和化学工業社製）０．０１質量部、イルガノックス１０１０（ＢＡＳＦ社製）０．１質量部、イルガフォス１６８（ＢＡＳＦ社製）０．０５質量部、ＮＵ－１００（β晶核剤、新日本理化株式会社製）０．１質量部をヘンシェルミキサーで混合した後、溶融押出を行ってペレット状の樹脂組成物Ｃ３を得た。得られた樹脂組成物Ｃ３の２３０℃で測定したメルトフローレートは３．２ｇ／１０分であった。結果を表１に示す。 [Comparative Example 3: Resin composition C3]
For 100 parts by weight of propylene homopolymer F, 0.01 part by mass of hydrotalcite (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.1 part by mass of Irganox 1010 (manufactured by BASF Corporation), 0.0 parts by mass of Irgafos 168 (manufactured by BASF Corporation) 0.05 parts by mass and 0.1 parts by mass of NU-100 (β crystal nucleating agent, manufactured by New Japan Chemical Co., Ltd.) were mixed in a Henschel mixer, and then melt extruded to obtain pellet-shaped resin composition C3. The melt flow rate of the resulting resin composition C3 measured at 230°C was 3.2 g/10 minutes. The results are shown in Table 1.
　樹脂組成物Ｃ３を用いた以外は、実施例１と同様にして、シーラントフィルムを作製し、その特性を評価した。結果を表２に示す。 A sealant film was produced in the same manner as in Example 1, except that resin composition C3 was used, and its properties were evaluated. The results are shown in Table 2.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表２の結果から分かるように、本発明の構成要件をすべて満たす各実施例の樹脂組成物は、耐レトルト融着性に比較的優れたシーラントフィルムを得ることができる。また、各実施例の樹脂組成物は、低温でのヒートシール強度に優れたシーラントフィルムを得ることができる。 As can be seen from the results in Table 2, the resin compositions of each example that satisfy all the constituent requirements of the present invention can provide a sealant film with relatively excellent retort fusion resistance. Further, the resin compositions of each example can provide a sealant film with excellent heat seal strength at low temperatures.
　一方、比較例１の樹脂組成物は、β晶核剤を含有しないため、該樹脂組成物を用いて得られたフィルムの耐レトルト融着性、および、低温でのヒートシール強度が劣る。比較例２の樹脂組成物は、プロピレン系共重合体（２）およびβ晶核剤を含有しないため、該樹脂組成物を用いて得られたフィルムの耐レトルト融着性、および、低温でのヒートシール強度が劣る。比較例３の樹脂組成物は、プロピレン系共重合体（２）を含有しないため、該樹脂組成物を用いて得られたフィルムの耐レトルト融着性が劣る。 On the other hand, since the resin composition of Comparative Example 1 does not contain a β-crystal nucleating agent, the retort fusion resistance and heat seal strength at low temperatures of the film obtained using the resin composition are poor. Since the resin composition of Comparative Example 2 does not contain the propylene copolymer (2) and the β-crystal nucleating agent, the retort fusion resistance of the film obtained using the resin composition and the low temperature stability are Heat seal strength is poor. Since the resin composition of Comparative Example 3 does not contain the propylene copolymer (2), the retort fusion resistance of the film obtained using the resin composition is poor.
　本発明のシーラントフィルム用樹脂組成物は、耐レトルト融着性に比較的優れたシーラントフィルムに利用することができ、そのシーラントフィルムを備えるレトルト包装材の用途などに、高い利用可能性を有する。 The resin composition for a sealant film of the present invention can be used for a sealant film that has relatively excellent retort fusion resistance, and has high applicability for applications such as retort packaging materials equipped with the sealant film.

Claims (13)

  1. 　プロピレンに由来する構造単位を９８質量％以上含むプロピレン系重合体（１）と、
    　プロピレンに由来する構造単位を４０質量％超９０質量％未満と、エチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位を１０質量％超６０質量％未満と、を含むプロピレン系共重合体（２）と、
    　β晶核剤と、
    　を含有する、シーラントフィルム用樹脂組成物。     A propylene polymer (1) containing 98% by mass or more of structural units derived from propylene;
    More than 40% by mass and less than 90% by mass of structural units derived from propylene, and more than 10% by mass and less than 60% by mass of structural units derived from at least one selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms. A propylene copolymer (2) containing less than %,
    β-crystal nucleating agent,
    A resin composition for sealant film containing.
  2. 　前記プロピレン系共重合体（２）が、プロピレンに由来する構造単位を５０質量％超９０質量％未満と、エチレンに由来する構造単位を１０質量％超５０質量％未満と、を含む、請求項１に記載のシーラントフィルム用樹脂組成物。 Claim wherein the propylene-based copolymer (2) contains more than 50% by mass and less than 90% by mass of structural units derived from propylene, and more than 10% by mass and less than 50% by mass of structural units derived from ethylene. 1. The resin composition for sealant film according to 1.
  3. 　さらに、プロピレンに由来する構造単位を９０質量％以上９８質量％未満と、エチレンおよび炭素原子数４～１２のα－オレフィンからなる群から選ばれる少なくとも１種に由来する構造単位を２質量％超１０質量％以下と、を含むプロピレン系共重合体（３）を含有する、請求項１または２に記載のシーラントフィルム用樹脂組成物。 Furthermore, the content of structural units derived from propylene is 90% by mass or more and less than 98% by mass, and the content of structural units derived from at least one kind selected from the group consisting of ethylene and α-olefins having 4 to 12 carbon atoms is more than 2% by mass. The resin composition for a sealant film according to claim 1 or 2, comprising a propylene copolymer (3) containing 10% by mass or less.
  4. 　さらに、エチレンに由来する構造単位を６０質量％以上９８質量％以下と、炭素原子数４～１２のα－オレフィンに由来する構造単位を２質量％以上４０質量％以下と、を含むエチレン系共重合体を含有する、請求項１～３のいずれか一項に記載のシーラントフィルム用樹脂組成物。 Furthermore, ethylene-based compounds containing 60% by mass or more and 98% by mass of structural units derived from ethylene and 2% by mass or more and 40% by mass or less of structural units derived from α-olefins having 4 to 12 carbon atoms The resin composition for sealant film according to any one of claims 1 to 3, which contains a polymer.
  5. 　前記樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、
    　前記プロピレン系重合体（１）の含有量が５０質量部以上９５質量部以下であり、
    　前記プロピレン系共重合体（２）の含有量が５質量部以上５０質量部以下である、請求項１～４のいずれか一項に記載のシーラントフィルム用樹脂組成物。     With respect to a total of 100 parts by mass of the polymer content contained in the resin composition,
    The content of the propylene polymer (1) is 50 parts by mass or more and 95 parts by mass or less,
    The resin composition for a sealant film according to any one of claims 1 to 4, wherein the content of the propylene copolymer (2) is 5 parts by mass or more and 50 parts by mass or less.
  6. 　前記樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、
    　前記プロピレン系重合体（１）の含有量が５０質量部以上８９質量部未満であり、
    　前記プロピレン系共重合体（２）の含有量が１１質量部超５０質量部以下である、請求項５に記載のシーラントフィルム用樹脂組成物。     With respect to a total of 100 parts by mass of the polymer content contained in the resin composition,
    The content of the propylene polymer (1) is 50 parts by mass or more and less than 89 parts by mass,
    The resin composition for a sealant film according to claim 5, wherein the content of the propylene copolymer (2) is more than 11 parts by mass and 50 parts by mass or less.
  7. 　前記樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、
    　前記プロピレン系重合体（１）の含有量が１０質量部以上７８質量部以下であり、
    　前記プロピレン系共重合体（２）の含有量が２質量部以上４０質量部以下であり、
    　前記プロピレン系共重合体（３）の含有量が２０質量部以上８０質量部以下である、請求項３に記載のシーラントフィルム用樹脂組成物。     With respect to a total of 100 parts by mass of the polymer content contained in the resin composition,
    The content of the propylene polymer (1) is 10 parts by mass or more and 78 parts by mass or less,
    The content of the propylene copolymer (2) is 2 parts by mass or more and 40 parts by mass or less,
    The resin composition for a sealant film according to claim 3, wherein the content of the propylene copolymer (3) is 20 parts by mass or more and 80 parts by mass or less.
  8. 　前記樹脂組成物中に含有される重合体の含有量の合計１００質量部に対して、
    　前記プロピレン系重合体（１）の含有量が３５質量部以上７５質量部以下であり、
    　前記プロピレン系共重合体（２）の含有量が５質量部以上５０質量部以下であり、
    　前記エチレン系共重合体の含有量が２質量部以上３０質量部以下である、請求項４に記載のシーラントフィルム用樹脂組成物。     With respect to a total of 100 parts by mass of the polymer content contained in the resin composition,
    The content of the propylene polymer (1) is 35 parts by mass or more and 75 parts by mass or less,
    The content of the propylene copolymer (2) is 5 parts by mass or more and 50 parts by mass or less,
    The resin composition for a sealant film according to claim 4, wherein the content of the ethylene copolymer is 2 parts by mass or more and 30 parts by mass or less.
  9. 　前記β晶核剤の濃度が１００質量ｐｐｍ以上３０００質量ｐｐｍ以下である、請求項１～８のいずれか一項に記載のシーラントフィルム用樹脂組成物。 The resin composition for a sealant film according to any one of claims 1 to 8, wherein the concentration of the β crystal nucleating agent is 100 mass ppm or more and 3000 mass ppm or less.
  10. 　請求項１～９のいずれか一項に記載のシーラントフィルム用樹脂組成物を含有するシーラントフィルム。 A sealant film containing the resin composition for sealant film according to any one of claims 1 to 9.
  11. 　厚さが５μｍ以上２００μｍ以下である、請求項１０に記載のシーラントフィルム。 The sealant film according to claim 10, having a thickness of 5 μm or more and 200 μm or less.
  12. 　請求項１０または１１に記載のシーラントフィルムをシーラント層として備える多層フィルム。 A multilayer film comprising the sealant film according to claim 10 or 11 as a sealant layer.
  13. 　請求項１～９のいずれか一項に記載のシーラントフィルム用樹脂組成物を溶融混練する溶融混練工程と、
    　溶融混練された組成物を押し出す押出工程と、
    　押し出された組成物を厚さ５μｍ以上２００μｍ以下に製膜する製膜工程と、を含む、シーラントフィルムの製造方法。     A melt-kneading step of melt-kneading the resin composition for sealant film according to any one of claims 1 to 9,
    an extrusion step of extruding the melt-kneaded composition;
    A method for producing a sealant film, comprising a film forming step of forming an extruded composition into a film having a thickness of 5 μm or more and 200 μm or less.
PCT/JP2023/001862 2022-03-09 2023-01-23 Resin composition for sealant film, sealant film, multilayered film, and method for producing sealant film WO2023171155A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008255191A (en) * 2007-04-03 2008-10-23 Sumitomo Chemical Co Ltd Polypropylene resin composition for foaming and foam-molded article made therefrom
JP2013209635A (en) * 2012-02-28 2013-10-10 Sumitomo Chemical Co Ltd Polypropylene based resin, film made from the same and method for manufacturing polypropylene based resin
JP2015203065A (en) * 2014-04-14 2015-11-16 日本ポリプロ株式会社 Thermoformed product composed of propylene resin composition
JP2017036386A (en) * 2015-08-10 2017-02-16 日本ポリプロ株式会社 Method for using polypropylene resin composition for deformation recovery structure and deformation recovery structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008255191A (en) * 2007-04-03 2008-10-23 Sumitomo Chemical Co Ltd Polypropylene resin composition for foaming and foam-molded article made therefrom
JP2013209635A (en) * 2012-02-28 2013-10-10 Sumitomo Chemical Co Ltd Polypropylene based resin, film made from the same and method for manufacturing polypropylene based resin
JP2015203065A (en) * 2014-04-14 2015-11-16 日本ポリプロ株式会社 Thermoformed product composed of propylene resin composition
JP2017036386A (en) * 2015-08-10 2017-02-16 日本ポリプロ株式会社 Method for using polypropylene resin composition for deformation recovery structure and deformation recovery structure

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