WO2022196220A1 - 樹脂組成物、該樹脂組成物を含むフィルムおよびその用途 - Google Patents
樹脂組成物、該樹脂組成物を含むフィルムおよびその用途 Download PDFInfo
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- WO2022196220A1 WO2022196220A1 PCT/JP2022/005840 JP2022005840W WO2022196220A1 WO 2022196220 A1 WO2022196220 A1 WO 2022196220A1 JP 2022005840 W JP2022005840 W JP 2022005840W WO 2022196220 A1 WO2022196220 A1 WO 2022196220A1
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Classifications
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
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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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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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
- B32B2457/00—Electrical equipment
- B32B2457/10—Batteries
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2314/00—Polymer mixtures characterised by way of preparation
- C08L2314/06—Metallocene or single site catalysts
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/10—Homopolymers or copolymers of propene
- C09J123/14—Copolymers of propene
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a resin composition, a film containing the resin composition, and uses thereof.
- polypropylene has been widely used as a thermoplastic molding material with excellent rigidity, heat resistance, and transparency. Since this polypropylene is a non-polar material, it has poor adhesion to metal materials such as aluminum and polar materials such as ethylene-vinyl alcohol copolymer. Techniques for modifying polypropylene with an unsaturated carboxylic acid or a derivative thereof are widely known for the purpose of improving adhesion. Moreover, since polypropylene is inferior in flexibility, when it is used as an adhesive resin, polypropylene is usually blended with a soft rubber component. A polypropylene-based adhesive resin having improved adhesiveness has been proposed by blending polypropylene with a soft rubber component (Patent Document 1).
- ethylene-vinyl alcohol copolymer which has gas barrier properties
- a polar resin such as polyamide (PA) or polyester (eg polyethylene terephthalate (PET)
- PET polyethylene terephthalate
- a multi-layer film for drawing has been proposed, for example, in Patent Document 2 and the like.
- polypropylene is also used as a building and industrial material because it has moderate flexibility, abrasion resistance, scratch resistance, heat resistance, chemical resistance, and post-processing properties.
- construction and industrial materials include decorative films that are used as decorative boards by laminating them with an adhesive to the surfaces of wooden boards, inorganic boards, metal plates, and the like.
- Japanese Patent Application Laid-Open No. 2002-200003 proposes a technique of bonding a pattern layer on a base film constituting a decorative film and a polypropylene protective layer for protecting the pattern layer via a polypropylene-based adhesive resin layer.
- JP-A-04-300933 Japanese Patent Application Laid-Open No. 2000-301675 Japanese Patent No. 4803441 JP 2014-210841 A JP 2014-225378 A WO2014/106887
- the present invention has been made in view of the above problems, and provides an adhesive resin composition that can form food packaging materials, construction and industrial materials, and secondary battery members that are excellent in low-temperature adhesion and whitening prevention, and the composition.
- An object of the present invention is to provide a film containing an object, a food packaging material containing the film, a building/industrial material, and a member for a secondary battery.
- the present inventors have studied to solve the above problems. As a result, the inventors have found that the above problems can be solved by the following aspects, and have completed the present invention.
- the content of the propylene-based polymer (A) satisfying the following (a) is 10 to 99.9 parts by mass
- the content of the propylene-based polymer (B) satisfying the following (b) is 0 to 40 parts by mass
- the content of polyolefin (C) containing structural units derived from unsaturated carboxylic acid and/or derivatives thereof is 0.1 to 20 parts by mass
- the content of the ethylene polymer (D) satisfying the following (d) is 0 to 40 parts by mass (provided that the total content of components (A), (B), (C) and (D) is 100 parts by mass)
- resin composition (a) a melting point (Tm) observed in differential scanning calorimetry is less than 120°C and greater than or equal to 100°C; (b) MFR measured at 230 ° C.
- the content of the propylene-based polymer (A) is 10 to 94.9 parts by mass;
- the content of the propylene-based polymer (B) is 5 to 40 parts by mass,
- the content of the polyolefin (C) is 0.1 to 20 parts by mass,
- the content of the ethylene polymer (D) is 0 to 40 parts by mass (provided that the total content of components (A), (B), (C) and (D) is 100 parts by mass) , the resin composition according to [1].
- the content of the propylene-based polymer (A) is 10 to 94.9 parts by mass;
- the content of the propylene-based polymer (B) is 0 to 40 parts by mass,
- the content of the polyolefin (C) is 0.1 to 20 parts by mass,
- the content of the ethylene polymer (D) is 5 to 40 parts by mass (provided that the total content of components (A), (B), (C) and (D) is 100 parts by mass) , the resin composition according to [1].
- a monolayer or multilayer film comprising at least one layer containing the resin composition according to any one of [1] to [4].
- At least one layer containing the resin composition according to any one of [1] to [4] and at least one layer selected from a metal-containing layer, a polyolefin layer and a polar resin layer wherein the layer containing the composition is in contact with at least one of the metal-containing layer, the polyolefin layer and the polar resin layer.
- a food packaging material comprising the monolayer or multilayer film of [5], or the multilayer film of [6] or [7].
- a building/industrial material comprising the monolayer or multilayer film of [5] or the multilayer film of [6] or [7].
- a secondary battery member comprising the single-layer or multilayer film of [5], or the multilayer film of [6] or [7].
- the secondary battery member according to [10] which is an exterior material for a lithium ion battery.
- an adhesive resin composition capable of forming food packaging materials, construction and industrial materials, and secondary battery members excellent in low-temperature adhesion and whitening prevention, a film containing the composition, and the film.
- Food packaging materials, construction and industrial materials, and secondary battery materials can be provided.
- the resin composition of the present invention contains a propylene-based polymer (A) and a polyolefin (C) containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, and further contains a propylene-based polymer (B ) or an ethylene-based polymer (D), or a propylene-based polymer (B) and an ethylene-based polymer (D).
- Propylene polymer (A) examples include propylene homopolymers and copolymers of propylene and at least one ⁇ -olefin having 2 to 20 carbon atoms other than propylene.
- ⁇ -olefins having 2 to 20 carbon atoms other than propylene include ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, etc., and ethylene or an ⁇ -olefin having 4 to 10 carbon atoms are preferred.
- the copolymer of propylene and these ⁇ -olefins may be a random copolymer or a block copolymer. Structural units derived from these ⁇ -olefins can be contained in the copolymer of ⁇ -olefin and propylene in a proportion of 35 mol % or less, preferably 30 mol % or less.
- the propylene-based polymer (A) satisfies the following requirement (a).
- the melting point (Tm) observed in differential scanning calorimetry is lower than 120°C and higher than or equal to 100°C.
- the melting point (Tm) is preferably 100 to 115°C, more preferably 100 to 110°C.
- the propylene-based polymer (A) has a melt flow rate (MFR) of 0.01 to 1000 g/10 minutes, preferably 0.1 to 100 g/ Preferably in the 10 minute range.
- MFR melt flow rate
- the propylene-based polymer (A) may have either an isotactic structure or a syndiotactic structure, and either structure is selected in consideration of compatibility with the propylene-based polymer (B) as described later. be able to.
- examples of the form of the propylene-based polymer (A) include an isotactic propylene-based polymer (A1) and a syndiotactic propylene-based polymer (A2).
- the isotactic propylene-based polymer (A1) a homopolypropylene having excellent heat resistance, for example, a known homopolypropylene having a copolymerization component other than propylene of 3 mol% or less, a block having an excellent balance between heat resistance and flexibility.
- Polypropylene for example known block polypropylene having a normal decane-eluted rubber component of usually 3 to 30% by mass, and random polypropylene having an excellent balance between flexibility and transparency, for example, a melting peak usually measured by a differential scanning calorimeter DSC Below 120 ° C., 100 ° C. or higher, preferably in the range of 100 to 110 ° C., known random polypropylenes can be mentioned. It is possible to use two or more of the polypropylene components in combination.
- Such an isotactic propylene-based polymer (A1) is, for example, a Ziegler catalyst system comprising a solid catalyst component containing magnesium, titanium, halogen and an electron donor as essential components, an organoaluminum compound and an electron donor, or a metallocene It can be produced by polymerizing propylene or copolymerizing propylene with other ⁇ -olefins in a metallocene catalyst system using the compound as one component of the catalyst.
- the syndiotactic propylene-based polymer (A2) contains 90 mol% or more of structural units derived from propylene and 10 mol% or less of structural units derived from one or more selected from ethylene and ⁇ -olefins having 4 to 20 carbon atoms. , Preferably, 91 mol% or more of structural units derived from propylene and 9 mol% or less of structural units derived from one or more selected from ethylene and ⁇ -olefins having 4 to 20 carbon atoms (however, the total of both structural units is 100 mol%).
- Examples of ⁇ -olefins having 4 to 20 carbon atoms include 1-butene, 3-methyl-1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1 -dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like.
- the syndiotactic propylene-based polymer (A2) has a melting peak usually lower than 120°C, higher than 100°C, preferably in the range of 100 to 110°C, as measured by a differential scanning calorimeter DSC.
- the syndiotactic propylene-based polymer (A2) can be produced, for example, using the method described in International Publication No. WO2011/078054.
- (B) Propylene-Based Polymer The propylene-based polymer (B) satisfies the following requirement (b).
- (b) MFR measured at 230 ° C. under a load of 2.16 kg in accordance with ASTM D1238 is in the range of 0.01 to 100 g / 10 minutes, and the following requirements (b-1) and (b-2) are satisfied. Fulfill.
- (b-1) The melting point (Tm) is less than 100° C. or no melting point is observed.
- (b-2) having a structural unit derived from propylene and a structural unit derived from at least one olefin selected from ethylene and an ⁇ -olefin having 4 to 20 carbon atoms, and ethylene and 4 carbon atoms;
- the content of structural units derived from at least one ⁇ -olefin selected from ⁇ 20 is 40 mol% or less.
- Requirement (b) and the like will be described in detail below.
- the melt flow rate (MFR; ASTM D1238, 230° C., under 2.16 kg load) of the propylene-based polymer (B) is 0.01 to 100 g/10 min, preferably 0.1 to 30 g/10 min. be.
- the propylene-based polymer (B) also satisfies requirements (b-1) and (b-2).
- the melting point (Tm) observed in differential scanning calorimetry is less than 100°C or no melting point is observed.
- no melting point is observed means that no crystal melting peak with a heat of crystal melting of 1 J/g or more is observed in the range of -150 to 200°C in differential scanning calorimetry.
- the details of the melting point measurement conditions are as described in Examples below.
- the melting point (Tm) is preferably 90°C or lower, more preferably 80°C or lower. If the melting point (Tm) satisfies the above conditions, it is preferable from the viewpoint of compatibility with the propylene-based polymer and low-temperature adhesion.
- Requirement (b-2) It has a structural unit derived from propylene and a structural unit derived from at least one olefin selected from ethylene and an ⁇ -olefin having 4 to 20 carbon atoms, and is selected from ethylene and 4 to 20 carbon atoms.
- the content of structural units derived from at least one ⁇ -olefin is 40 mol % or less.
- ⁇ -olefins having 4 to 20 carbon atoms include 3-methyl-1-butene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1 -dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like.
- At least one olefin selected from ethylene and ⁇ -olefins having 4 to 20 carbon atoms is particularly preferably ethylene, 1-butene, 1-hexene, 4-methyl-1-pentene and 1-octene.
- the content of structural units derived from ethylene and at least one ⁇ -olefin selected from 4 to 20 carbon atoms is preferably 40 mol% or less, more preferably 35 mol% or less.
- the density of the propylene-based polymer (B) measured by JIS K7112 is preferably 0.85 to 0.89 g/cm 3 , more preferably 0.86 to 0.88 g/cm 3 . is.
- the intrinsic viscosity [ ⁇ ] of the propylene-based polymer (B) measured in decalin at 135° C. is desirably 0.1 to 10 dL/g, preferably 0.5 to 10 dL/g.
- This propylene-based polymer (B) has a single glass transition temperature, and the glass transition temperature (Tg) obtained by differential scanning calorimetry (DSC) is usually -50°C to 10°C, preferably - It is in the range of 45°C to 5°C, more preferably -40°C to 0°C.
- the propylene-based polymer (B) preferably has a glass transition temperature (Tg) within the above range because it is excellent in cold resistance and low-temperature properties.
- Differential scanning calorimetry is performed, for example, as follows. About 10.00 mg of the sample was packed in a dedicated aluminum pan, and using a DSCRDC220 manufactured by Seiko Instruments Inc., the temperature was raised from 30 ° C. to 200 ° C. at a rate of 200 ° C./min. C. to -100.degree. C. at a rate of 10.degree. C./min, held at -100.degree.
- the molecular weight distribution (Mw/Mn, polystyrene equivalent, Mw: weight average molecular weight, Mn: number average molecular weight) of the propylene-based polymer (B) measured by GPC is preferably 3.5 or less, more preferably 3.0. It is below. Moreover, a lower limit is 1.5 or more, for example.
- a part of the propylene-based polymer (B) may be graft-modified with a polar monomer.
- polar monomers include hydroxyl group-containing ethylenically unsaturated compounds, amino group-containing ethylenically unsaturated compounds, epoxy group-containing ethylenically unsaturated compounds, aromatic vinyl compounds, vinyl ester compounds, and vinyl chloride.
- the modified propylene-based polymer (B) is obtained by graft-polymerizing a polar monomer to the propylene-based polymer (B) as described above.
- the polar monomer as described above is graft-polymerized to the propylene-based polymer (B)
- the polar monomer is usually added in an amount of 0.1 to 10 parts by mass with respect to 100 parts by mass of the propylene-based polymer (B). It is preferably used in an amount of 0.1 to 5 parts by weight.
- This graft polymerization is usually carried out in the presence of a radical initiator.
- a radical initiator an organic peroxide, an azo compound, or the like can be used.
- the radical initiator can be used by mixing the propylene-based polymer (B) and the polar monomer as they are, or can be used after being dissolved in a small amount of organic solvent.
- Any organic solvent capable of dissolving the radical initiator can be used without particular limitation as the organic solvent.
- a reducing substance may be used when graft-polymerizing a polar monomer to the propylene-based polymer (B). Using a reducing substance can improve the grafting amount of the polar monomer.
- Graft modification of the propylene-based polymer (B) with a polar monomer can be carried out by a conventionally known method.
- the reaction can be carried out at a temperature of 70 to 200° C., preferably 80 to 190° C., for 0.5 to 15 hours, preferably 1 to 10 hours.
- the modified propylene-based polymer (B) can also be produced by reacting the propylene-based polymer (B) with a polar monomer using an extruder or the like without a solvent. This reaction is preferably carried out at a temperature higher than the melting point of the propylene-based polymer (B), specifically 120 to 250° C. for 0.5 to 10 minutes.
- the modified amount of the modified propylene-based polymer thus obtained (graft amount of polar monomer) is usually 0.1 to 10% by mass, preferably 0.1 to 5% by mass, more preferably 0.5 to 5% by mass. % by mass is desirable.
- the propylene-based polymer composition of the present invention contains the above modified propylene-based polymer, the adhesiveness and compatibility with other resins are excellent, and the wettability of the molded article surface may be improved.
- the propylene-based polymer (B) can be produced, for example, using the method described in International Publication No. WO2004/087775.
- Preferred forms of the propylene-based polymer (B) include the following propylene/1-butene copolymer (B1), propylene/ethylene copolymer (B2), and propylene/ethylene/1-butene copolymer (B3). and atactic propylene homopolymer (B4).
- the propylene/1-butene copolymer (B1) contains structural units derived from propylene in an amount of 60 to 90 mol%, preferably 70 to 85 mol% in the propylene-based polymer (B) described above. contains.
- the propylene/1-butene copolymer (B1) having such a composition has good compatibility with the propylene-based polymer (A).
- the propylene/ethylene copolymer (B2) contains 60 to 95 mol %, preferably 75 to 90 mol %, of structural units derived from propylene in the propylene polymer (B) described above.
- the propylene/ethylene/1-butene copolymer (B3) contains structural units derived from propylene in an amount of 60 to 95 mol%, preferably 70 to 90 mol%, in the propylene-based polymer (B) described above. , Structural units derived from ethylene in an amount of 2 to 25 mol%, preferably 5 to 20 mol%, Structural units derived from 1-butene in an amount of 3 to 30 mol%, preferably 5 to 25 mol% contains an amount of
- the atactic propylene homopolymer (B4) has a mesopentad fraction of 20 to 80%, preferably 30 to 60% in the propylene polymer (B) described above.
- Polyolefin (C) containing structural units derived from unsaturated carboxylic acid and/or its derivative Polyolefin (C) is obtained by modifying polyolefin with unsaturated carboxylic acid and/or its derivative, and contains structural units derived from the unsaturated carboxylic acid and/or its derivative.
- polyolefins to be modified examples include polypropylene (c1), ethylene/propylene/ ⁇ -olefin copolymer (c2) and ethylene/ ⁇ -olefin copolymer (c3).
- the polyolefin (C) may be used singly or as a mixture of two or more.
- any one of a modified polypropylene (c1), a modified ethylene/propylene/ ⁇ -olefin copolymer (c2) and a modified ethylene/ ⁇ -olefin copolymer (c3), or two of these It may be a mixture of more than one species.
- the polypropylene (c1) is, for example, a propylene homopolymer and/or a propylene/ ⁇ -olefin copolymer.
- the ⁇ -olefins are not limited, but preferably include ethylene and ⁇ -olefins having 4 to 20 carbon atoms, and these ⁇ -olefins may be used singly or in combination of two or more.
- Preferred ⁇ -olefins are ethylene and ⁇ -olefins having 4 to 10 carbon atoms, and ethylene and ⁇ -olefins having 4 to 8 carbon atoms are particularly preferred.
- the content of structural units derived from propylene in the propylene/ ⁇ -olefin copolymer is at least 50 mol % or more and less than 100%.
- the intrinsic viscosity [ ⁇ ] of polypropylene (c1) is preferably 0.1 to 10 dl/g. When the intrinsic viscosity [ ⁇ ] is within this range, a composition having excellent moldability and mechanical strength can be obtained.
- the method for producing polypropylene (c1) is not particularly limited, and examples include known methods using known catalysts such as Ziegler-Natta catalysts and metallocene catalysts.
- Polypropylene (c1) is preferably a crystalline polymer, and in the case of a copolymer, it may be a random copolymer or a block copolymer.
- stereoregularity and molecular weight are not particularly limited as long as they satisfy moldability and have strength enough to withstand use when formed into a molded product. It is also possible to use a commercially available resin as it is.
- the ethylene/propylene/ ⁇ -olefin copolymer (c2) is defined, for example, by the following (i) and (ii).
- (i) Contains 45 to 90 mol % of structural units derived from propylene, 2 to 25 mol % of structural units derived from ethylene, and 3 to 30 mol % of structural units derived from ⁇ -olefin having 4 to 20 carbon atoms.
- (ii) Intrinsic viscosity [ ⁇ ] in decalin at 135° C. is in the range of 0.1 to 10 dl/g.
- ⁇ -olefins having 4 to 10 carbon atoms can be suitably used, and one kind or two or more kinds may be used.
- the ratio of structural units derived from each monomer is preferably propylene 60 to 95 mol%, ethylene 2 to 25 mol%, ⁇ -olefin 3 to 30 mol%, propylene 70 to 90 mol%, ethylene 5 to 20 mol%, ⁇ -Olefin 5-25 Mole % is more preferred.
- the intrinsic viscosity [ ⁇ ] is more preferably in the range of 0.5-8, more preferably in the range of 0.8-6.
- the intrinsic viscosity [ ⁇ ] is within the above range, an adhesive with excellent balance between flexibility and mechanical strength and high adhesion can be obtained.
- the method for producing the ethylene/propylene/ ⁇ -olefin copolymer (c2) is not particularly limited, and it can be produced by a known method using a known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst. .
- the ethylene/propylene/ ⁇ -olefin copolymer (c2) has no particular restrictions on its stereoregularity and molecular weight as long as it satisfies moldability and has strength enough to withstand the use of a molded product. do not have. It is also possible to use a commercially available resin as it is.
- the ethylene/ ⁇ -olefin copolymer (c3) is defined, for example, by (iii) and (iv) below.
- Intrinsic viscosity [ ⁇ ] in decalin at 135° C. is in the range of 0.1 to 10 dl/g.
- ⁇ -olefins having 3 to 10 carbon atoms are more suitable, and one kind may be used alone or two or more kinds may be used.
- the ratio of structural units derived from each monomer is preferably 55 to 98 mol % ethylene and 2 to 45 mol % ⁇ -olefin, more preferably 60 to 95 mol % ethylene and 5 to 40 mol % ⁇ -olefin.
- the intrinsic viscosity [ ⁇ ] is more preferably in the range of 0.5-8, more preferably in the range of 0.8-6.
- the intrinsic viscosity [ ⁇ ] is within the above range, a composition with excellent balance between flexibility and mechanical strength and high adhesive strength can be obtained.
- the method for producing the ethylene/ ⁇ -olefin copolymer (c3) is not particularly limited, and includes known methods using known catalysts such as Ziegler-Natta catalysts and metallocene catalysts.
- the ethylene/ ⁇ -olefin copolymer (c3) has excellent moldability, and the molecular weight is not particularly limited as long as it can ensure strength enough to withstand use when formed into a molded product.
- the ethylene/ ⁇ -olefin copolymer (c3) a commercially available resin can be used as it is.
- unsaturated carboxylic acids and/or derivatives thereof that modify these polyolefins include unsaturated compounds having one or more carboxylic acid groups, esters of compounds having carboxylic acid groups and alkyl alcohols, and one or more carboxylic anhydride groups.
- An unsaturated compound etc. can be mentioned.
- a vinyl group, a vinylene group, an unsaturated cyclic hydrocarbon group, etc. can be mentioned as an unsaturated group which an unsaturated compound has.
- Unsaturated carboxylic acids and/or derivatives thereof may be used singly or in combination of two or more. Among these, unsaturated dicarboxylic acids and their acid anhydrides are preferred, and maleic acid, nadic acid and their acid anhydrides are particularly preferred.
- the amount of structural units derived from unsaturated carboxylic acid and/or derivatives thereof contained in polyolefin (C) is preferably 0.01 to 10% by mass in terms of structural units derived from maleic anhydride, and preferably 0.1 It is more preferably ⁇ 5% by mass.
- amount of structural units derived from an unsaturated carboxylic acid and/or a derivative thereof is within the above range, a resin composition having excellent balance between moldability and adhesion can be obtained.
- the content ratio of structural units derived from propylene in structural units excluding structural units derived from unsaturated carboxylic acids and/or derivatives thereof is preferably 80 to 100 mol%, preferably 90 to 100 mol % is more preferred.
- the content ratio of the propylene-derived structural unit is within the above range, a resin composition having excellent heat resistance can be obtained.
- the method for grafting the unsaturated carboxylic acid and/or its derivative is not particularly limited, and conventionally known graft polymerization methods such as a solution method and a melt-kneading method can be employed. For example, a method of melting a polyolefin and adding an unsaturated carboxylic acid and/or its derivative thereto for graft reaction, or a method of dissolving a polyolefin in a solvent to form a solution and adding an unsaturated carboxylic acid and/or a derivative thereof thereto. and graft reaction.
- Ethylene polymer (D) The ethylene-based polymer (D) satisfies the following requirements (d). (d) Ethylene homopolymer or copolymer of ethylene and at least one ⁇ -olefin selected from ⁇ -olefins having 3 to 20 carbon atoms, 190° C., 2.16 kg according to ASTM D1238 The MFR measured under load is in the range of 0.1 to 10 g/10 minutes.
- the MFR is preferably in the range of 0.1 to 8 g/10 minutes, more preferably in the range of 0.1 to 6 g/10 minutes. When the MFR is within the above range, a composition having excellent balance between flexibility and mechanical strength and high adhesive strength can be obtained.
- the ethylene/ ⁇ - Olefin copolymers are preferred.
- an ⁇ -olefin having 3 to 10 carbon atoms can be more preferably used, and within this range, one type or two or more types may be used.
- the ratio of each monomer component is preferably ethylene: 55 to 98 mol%, ⁇ -olefin: 2 to 45 mol%, ethylene: 60 to 95 mol%, ⁇ -olefin: 5 to 40 mol%. is more preferred.
- the method for producing the ethylene polymer (D) is not particularly limited, and it can be produced by a known method using a known catalyst such as a high pressure method, Ziegler-Natta catalyst, metallocene catalyst, etc. .
- the molecular weight is not particularly limited as long as it satisfies moldability and has strength enough to withstand use when formed into a molded product. It is also possible to use a commercially available resin as it is.
- the ethylene polymer (D) may be grafted with a small amount of maleic anhydride or the like as long as it satisfies the above conditions. Further, as long as the above conditions are satisfied, after grafting a small amount of maleic anhydride or the like, the graft monomer may be further modified with diamine, carbodiimide or the like.
- propylene/ethylene block copolymers, propylene homopolymers, and propylene/ethylene random copolymers having compositions different from those of the present invention are used as long as the effects of the present invention are not impaired.
- the ratio of other components in the resin composition of the present invention is preferably 20% by mass or less.
- antioxidants ultraviolet absorbers, neutralizers, nucleating agents, light stabilizers, antistatic agents, antiblocking agents, lubricants, odor adsorbents, antibacterial agents, pigments, inorganic and organic fillers, and various Known additives such as synthetic resins can be contained as necessary.
- Resin Composition The resin composition of the present invention can be produced using a conventionally known method. For example, it can be produced by melt-kneading the above components.
- the contents of the propylene-based polymer (A), the propylene-based polymer (B), the polyolefin (C), and the ethylene-based polymer (D) in the resin composition of the present invention are When the total content of the polymer (B), the polyolefin (C), and the ethylene polymer (D) is 100 parts by mass, the propylene polymer (A) is 10 to 99.9 parts by mass, the propylene polymer Polymer (B) 0 to 40 parts by mass, polyolefin (C) 0.1 to 20 parts by mass, ethylene polymer (D) 0 to 40 parts by mass, Propylene-based polymer (A) 10-94.9 parts by mass, propylene-based polymer (B) 5-40 parts by mass, polyolefin (C) 0.1-20 parts by mass, ethylene-based polymer (D) 0-40 It is preferably parts by mass, Propylene polymer (A) 10-89.5 parts by mass, propylene polymer (B) 5-40 parts by mass
- the amount is up to 40 parts by mass, and it is a more preferred embodiment that the density of the ethylene polymer (D) is 0.87 g/cm 3 or less.
- the density is more preferably 0.80 g/cm 3 or more.
- the adhesiveness particularly the adhesiveness at low heat, specifically the adhesiveness at 140 ° C. or less is high, and the adhesiveness obtained from the composition is A film containing a layer that contains a coating is less likely to whiten during deformation processing.
- the resin composition of the present invention preferably has an MFR of 0.1 g/10 min or more and 30 g/10 min or less, more preferably 1 g/10 min, measured at 230°C under a load of 2.16 kg according to ASTM D1238. It is 10 minutes or more and 20 g/10 minutes or less.
- MFR 0.1 g/10 min or more and 30 g/10 min or less, more preferably 1 g/10 min, measured at 230°C under a load of 2.16 kg according to ASTM D1238. It is 10 minutes or more and 20 g/10 minutes or less.
- the single-layer and multilayer films of the present invention are single-layer or multilayer films containing at least one layer containing the resin composition. That is, the single-layer film of the present invention is a film comprising a layer containing the resin composition, and the multilayer film is a multilayer film containing at least one layer containing the resin composition.
- the single-layer and multilayer films of the present invention are excellent in whitening resistance during deformation processing. Therefore, when the single-layer and multilayer films of the present invention are used as food packaging materials, construction/industrial materials, and secondary battery members such as lithium-ion battery members, secondary processing of the film such as drawing and bending may occur. Whitening is less likely to occur. Therefore, the single-layer and multilayer films of the present invention can be suitably used as food packaging materials, construction/industrial materials, and secondary battery members.
- polypropylene-based resins have been used as packaging materials for forming the outer packaging of lithium-ion batteries.
- (C) and ethylene-based polymer (D) it is possible to prevent whitening, which could not be prevented with conventional polypropylene-based resins.
- the multilayer film of the present invention includes, for example, at least one layer containing the resin composition, and one or both sides of the layer containing the composition are in contact with other layers contained in the multilayer film.
- Other layers that are in contact with the layer containing the composition include, for example, a metal-containing layer, a polyolefin layer, and a polar resin layer.
- the metal-containing layer include an aluminum layer, a copper layer, and a stainless steel layer.
- the polyolefin layer include a polypropylene layer, a poly-4-methylpentene layer, and a polyethylene layer.
- the polar resin layer include a polyamide layer. , an EVOH layer, a PET layer, a PBT layer, and the like.
- the single-layer and multilayer films of the present invention can be obtained by melt extrusion molding, and can be produced by general industrial methods such as casting, inflation, and extrusion lamination.
- ⁇ Member for secondary battery examples include, for example, a tab-lead film for lithium ion batteries (hereinafter also simply referred to as “tab-lead film”), an exterior material for lithium ion batteries (hereinafter simply referred to as “exterior material “Also called.) and the like.
- the tab lead is a terminal for transferring electricity between the electrode and the outside in the battery, and has a metal layer as a lead base material and a tab lead film formed on at least one side of the lead base material.
- the layer (film) made of the composition of the present invention is in contact with the lead substrate and can have other layers as necessary.
- the tab lead film is formed to cover a part of the lead base material (lead conductor) and adhere to the inner surface of the exterior material in the lithium ion battery. Since the tab lead film of the present invention has excellent low-temperature adhesion properties, the adhesion temperature to the lead substrate can be made lower than in the past. can improve sexuality.
- the bonding temperature with the lead substrate is not particularly limited as long as it is a temperature at which the tab lead film melts, but it is preferably 100 to 200°C, more preferably 130 to 180°C.
- the heating time is also not particularly limited, but is preferably 1 second to 10 minutes, more preferably 1 second to 1 minute.
- One embodiment of the tab lead film of the present invention is a laminated film having an adhesive layer made of the composition of the present invention and a heat-resistant layer.
- the adhesive layer is adhered to the lead substrate, and the heat-resistant layer is adhered to the inner surface of the exterior material.
- lead base material connected to the positive electrode of the lithium ion battery for example, a lead conductor made of aluminum, titanium, or an alloy containing at least one selected from these is used.
- lead base material connected to the negative electrode of the lithium ion battery for example, a lead conductor made of copper, nickel, or an alloy containing at least one selected from these is used.
- the heat-resistant layer examples include a layer made of polyolefin resin.
- polyolefin resins examples include thermoplastic polyolefin resins such as polyethylene and polypropylene. These may be used alone or in combination of two or more. It is preferable to use a polypropylene resin from the viewpoint of heat resistance. Also, the polyolefin resin may be crosslinked.
- the embodiment of the exterior material of the present invention is not particularly limited as long as it has an adhesive layer made of the composition of the present invention. is mentioned.
- MFR Melt flow rate
- Density was measured according to JIS K7112 (density gradient tube method).
- ⁇ Melting point> Melting points were measured using a differential scanning calorimeter (DSC) as follows. Approximately 5 mg of sample was sealed in an aluminum pan and heated from room temperature at 10°C/min to 230°C and the sample was held at 230°C for 10 minutes for complete melting. It was then cooled at 10°C/min to -20°C and after 10 minutes at -20°C, the sample was reheated at 10°C/min to 230°C. The peak temperature in this second heating test was taken as the melting point (Tm).
- DSC differential scanning calorimeter
- ⁇ Amount of graft modification The amount of structural units derived from unsaturated carboxylic acid and/or derivatives thereof (amount of graft modification) was measured by an infrared absorption spectrometer to determine the peak derived from the structural units (1790 cm ⁇ 1 when maleic anhydride was used). Intensities were measured and quantified using a previously prepared calibration curve.
- JIS K6251 No. 2 dumbbells were punched out so as to be parallel to the flow direction of the single layer film. values were measured. Furthermore, the hue L value of a JIS K6251 No. 2 dumbbell elongated and deformed by 5 mm, 10 mm or 20 mm at a crosshead speed of 200 mm/min was measured using a tensile tester. The amount of change in hue L value after 5 mm elongation was ⁇ L (5 mm), the amount of change in hue L value after 10 mm elongation was ⁇ L (10 mm), and the amount of change in hue L value after 20 mm elongation was ⁇ L (20 mm).
- An inner layer of the obtained multilayer film and an aluminum foil layer of a commercially available aluminum laminate film (aluminum foil/polyethylene terephthalate: 20/12 ⁇ m) are overlaid, and a heat sealer is used to seal at a temperature of 120°C, 130°C or 140°C.
- a composite was produced by heat-sealing under conditions of a sealing pressure of 0.1 MPa and a sealing time of 10 seconds.
- the adhesive strength (unit: N/15 mm) of the composite obtained at each sealing temperature was measured at room temperature of 23°C by the T-peel method using a tensile tester.
- the crosshead speed was 300 mm/min.
- Polyolefin used Polyolefins used in Examples and Comparative Examples are shown below. Unless otherwise specified, these polyolefins were prepared by polymerization according to a conventional method.
- PP-1 metallocene-based random polypropylene (MFR: 8 g/10 min, density: 0.89 g/cm 3 , propylene content: 94 mol%, Ethylene content: 6 mol%, melting point: 105°C)
- PP-2 metallocene-based random polypropylene (MFR: 7 g/10 min, density: 0.90 g/cm 3 , propylene content: 96 mol%, Ethylene content: 4 mol%, melting point: 125°C)
- PP-3 metallocene-based random polypropylene (MFR: 7 g/10 min, density: 0.89 g/cm 3 , propylene content: 85 mol%, 1-butene content: 15 mol%, melting point 98°C)
- PBR
- Example 1 ⁇ Manufacture of adhesive> 80 parts by mass of PP-1, 10 parts by mass of EPR, and 10 parts by mass of modified PP were melt-kneaded at 230° C. using a single screw extruder to obtain a resin composition. This composition was designated Adhesive 1.
- Examples 2 to 4 and Comparative Examples 1 to 5 resin compositions were produced in the same manner as in Example 1 according to the formulations shown in Table 1, respectively.
- the composition obtained in Example 2 is Adhesive 2
- the composition obtained in Example 3 is Adhesive 3
- the composition obtained in Example 4 is Adhesive 4
- the composition obtained in Comparative Example 1 The composition obtained in Comparative Example 2 is Adhesive 5
- the composition obtained in Comparative Example 2 is Adhesive 6
- the composition obtained in Comparative Example 3 is Adhesive 7
- the composition obtained in Comparative Example 4 is Adhesive 8
- Comparative Example The composition obtained in 5 was used as adhesive 9.
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Abstract
Description
[1] 下記(a)を満たすプロピレン系重合体(A)の含有量が10~99.9質量部、
下記(b)を満たすプロピレン系重合体(B)の含有量が0~40質量部、
不飽和カルボン酸及び/又はその誘導体から導かれる構造単位を含有するポリオレフィン(C)の含有量が0.1~20質量部、
下記(d)を満たすエチレン系重合体(D)の含有量が0~40質量部
である(ただし、成分(A)、(B)、(C)および(D)の含有量の合計を100質量部とする)、樹脂組成物:
(a)示差走査熱量測定において観測される融点(Tm)が120℃未満、100℃以上である;
(b)ASTM D1238に準拠して230℃、2.16kg荷重にて測定したMFRが0.01~100g/10分の範囲にあり、かつ下記要件(b-1)および(b-2)を満たす;
(b-1)示差走査熱量測定において観測される融点(Tm)が100℃未満であるか、または融点(Tm)が観測されない;
(b-2)プロピレンから導かれる構成単位と、エチレンおよび炭素原子数4~20のα-オレフィンから選ばれる少なくとも1種のオレフィンから導かれる構成単位とを有し、エチレンおよび炭素原子数4~20から選ばれる少なくとも1種のα-オレフィンから導かれる構成単位の含有量が40mol%以下である;
(d)エチレン単独重合体またはエチレンと炭素原子数3~20のα-オレフィンから選ばれる少なくとも1種のα-オレフィンとの共重合体であり、ASTM D1238に準拠して190℃、2.16kg荷重にて測定したMFRが0.1~10g/10分の範囲である。
前記プロピレン系重合体(B)の含有量が5~40質量部、
前記ポリオレフィン(C)の含有量が0.1~20質量部、
前記エチレン系重合体(D)の含有量が0~40質量部
である(ただし、成分(A)、(B)、(C)および(D)の含有量の合計を100質量部とする)、[1]に記載の樹脂組成物。
前記プロピレン系重合体(B)の含有量が0~40質量部、
前記ポリオレフィン(C)の含有量が0.1~20質量部、
前記エチレン系重合体(D)の含有量が5~40質量部
である(ただし、成分(A)、(B)、(C)および(D)の含有量の合計を100質量部とする)、[1]に記載の樹脂組成物。
[4] 前記エチレン系重合体(D)の密度が、0.87g/cm3以下である、[3]に記載の樹脂組成物。
[5] [1]~[4]のいずれか1つに記載の樹脂組成物を含む層を少なくとも1層含む、単層または多層フィルム。
[6] 少なくとも1層の[1]~[4]のいずれか1つに記載の樹脂組成物を含む層と、少なくとも2層の前記組成物を含む層以外の他の層とを含み、前記組成物を含む層の両面が前記他の層と接している多層フィルム。
[8] [5]に記載の単層もしくは多層フィルム、または[6]もしくは[7]に記載の多層フィルムを含む食品包装材。
[10] [5]に記載の単層もしくは多層フィルム、または[6]もしくは[7]に記載の多層フィルムを含む二次電池用部材。
[12] リチウムイオン電池用タブリードフィルムである[10]に記載の二次電池用部材。
[13] [1]~[4]のいずれか1つに記載の樹脂組成物を溶融押出成形する、単層または多層フィルムの製造方法。
本発明の樹脂組成物は、プロピレン系重合体(A)と不飽和カルボン酸及び/又はその誘導体に由来する構造単位を含有するポリオレフィン(C)とを含有し、さらに、プロピレン系重合体(B)もしくはエチレン系重合体(D)、またはプロピレン系重合体(B)およびエチレン系重合体(D)を含有することができる。
プロピレン系重合体(A)としては、プロピレン単独重合体、またはプロピレンと少なくとも1種のプロピレン以外の炭素原子数が2~20のα-オレフィンとの共重合体を挙げることができる。ここで、プロピレン以外の炭素原子数が2~20のα-オレフィンとしては、エチレン、1-ブテン、1-ペンテン、1-ヘキセン、4-メチル-1-ペンテン、1-オクテン、1-デセン、1-ドデセン、1-テトラデセン、1-ヘキサデセン、1-オクタデセン、1-エイコセンなどが挙げられ、エチレンまたは炭素原子数が4~10のα-オレフィンが好ましい。
(a)示差走査熱量測定において観測される融点(Tm)が120℃未満、100℃以上である。融点(Tm)が前記範囲内であることによって、本発明の樹脂組成物は耐白化性に優れ、低熱量接着性に優れる。
前記融点(Tm)は、好ましくは100~115℃、より好ましくは100~110℃である。
アイソタクティックプロピレン系重合体(A1)としては、耐熱性に優れるホモポリプロピレン、たとえば通常プロピレン以外の共重合成分が3mol%以下である公知のホモポリプロピレン、耐熱性と柔軟性とのバランスに優れるブロックポリプロピレン、たとえば通常3~30質量%のノルマルデカン溶出ゴム成分を有する公知のブロックポリプロピレン、および柔軟性と透明性とのバランスに優れるランダムポリプロピレン、たとえば通常示差走査熱量計DSCにより測定される融解ピークが120℃未満、100℃以上、好ましくは100~110℃の範囲にある公知のランダムポリプロピレンが挙げられ、目的の物性を得るためにこれらの中から適宜選択することができ、または融点や剛性の異なる2種類以上の前記ポリプロピレン成分を併用することが可能である。
シンジオタクティックプロピレン系重合体(A2)は、例えば国際公開番号WO2011/078054号に記載されているような手法を用いて製造することができる。
プロピレン系重合体(B)は、下記要件(b)を満たす。
(b)ASTM D1238に準拠して230℃、2.16kg荷重にて測定したMFRが0.01~100g/10分の範囲にあり、かつ下記要件(b-1)および(b-2)を満たす。
(b-1)融点(Tm)が100℃未満であるか、または融点が観測されない。
(b-2)プロピレンから導かれる構成単位と、エチレンおよび炭素原子数4~20のα-オレフィンから選ばれる少なくとも1種のオレフィンとから導かれる構成単位とを有し、エチレンおよび炭素原子数4~20から選ばれる少なくとも1種のα-オレフィンから導かれる構成単位の含有量が40mol%以下である。
要件(b)
プロピレン系重合体(B)のメルトフローレート(MFR;ASTM D1238、230℃、2.16kg荷重下)は、0.01~100g/10分であり、好ましくは0.1~30g/10分である。
またプロピレン系重合体(B)は、要件(b-1)および(b-2)を満たす。
示差走査熱量測定において観測される融点(Tm)が100℃未満であるか、または融点が観測されない。ここで、融点が観測されないとは、示差走査熱量測定において-150~200℃の範囲において、結晶融解熱量が1J/g以上の結晶融解ピークが観測されないことをいう。融点測定条件の詳細は、後述の実施例の項に記載したとおりである。
プロピレンから導かれる構成単位と、エチレンおよび炭素原子数4~20のα-オレフィンから選ばれる少なくとも1種のオレフィンとから導かれる構成単位とを有し、エチレンおよび炭素原子数4~20から選ばれる少なくとも1種のα-オレフィンから導かれる構成単位の含有量が40mol%以下である。
プロピレン系重合体(B)のJIS K7112(密度勾配管法)で測定した密度は、好ましくは0.85~0.89g/cm3であり、より好ましくは0.86~0.88g/cm3である。
プロピレン系重合体(B)の135℃デカリン中で測定した極限粘度[η]は、0.1~10dL/g、好ましくは0.5~10dL/gであることが望ましい。
プロピレン系重合体(B)は、例えば国際公開番号WO2004/087775号パンフレットに記載されているような手法を用いて製造することができる。
プロピレン・エチレン共重合体(B2)は、上述したプロピレン系重合体(B)において、プロピレンから導かれる構造単位を60~95モル%の量、好ましくは75~90モル%の量を含有する。
ポリオレフィン(C)は、ポリオレフィンを不飽和カルボン酸及び/又はその誘導体で変性して得られ、その不飽和カルボン酸及び/又はその誘導体に由来する構造単位を含有する。
ポリプロピレン(c1)としては、結晶性の重合体が好ましく、共重合体の場合には、ランダム共重合体であっても、ブロック共重合体であってもよい。更に、成形性を満足し、成形体としたときの使用に耐えうる強度を有するものであれば、立体規則性、分子量についても特段の制限はない。市販の樹脂をそのまま利用することも可能である。
(i)プロピレン由来の構造単位を45~90モル%,エチレン由来の構造単位を2~25モル%,炭素数4~20のα-オレフィン由来の構造単位を3~30モル%含有する。(ii)135℃デカリン中での極限粘度[η]が、0.1~10dl/gの範囲にある。
モル%が更に好ましい。
(iv)135℃デカリン中での極限粘度[η]が、0.1~10dl/gの範囲にある。
エチレン系重合体(D)は、下記要件(d)を満たす。
(d)エチレン単独重合体またはエチレンと炭素原子数3~20のα-オレフィンから選ばれる少なくとも1種のα-オレフィンとの共重合体であり、ASTM D1238に準拠して190℃、2.16kg荷重にて測定したMFRが0.1~10g/10分の範囲である。
が更に好ましい。
本発明の樹脂組成物においては、本発明の効果を損なわない範囲内で、本発明とは組成の異なるプロピレン・エチレンブロック共重合体、プロピレン単独重合体、プロピレン・エチレンランダム共重合体、プロピレン・1-ブテンランダム共重合体、プロピレン・エチレン・1-ブテンランダム共重合体、スチレン系エラストマー、ポリエチレンなどのその他の成分を適宜含有してもよい。本発明の樹脂組成物に占めるその他の成分の比率は20質量%以下であることが好ましい。
本発明の樹脂組成物は従来公知の方法を用いて、製造することができる。たとえば上記の各成分を溶融混練することで製造することができる。
プロピレン系重合体(A)10~94.9質量部、プロピレン系重合体(B)5~40質量部、ポリオレフィン(C)0.1~20質量部、エチレン系重合体(D)0~40質量部であることが好ましく、
プロピレン系重合体(A)10~89.5質量部、プロピレン系重合体(B)5~40質量部、ポリオレフィン(C)0.5~20質量部、エチレン系重合体(D)5~40質量部であることがより好ましく、
プロピレン系重合体(A)20~84質量部、プロピレン系重合体(B)10~35質量部、ポリオレフィン(C)1~20質量部、エチレン系重合体(D)5~35質量部であることがさらに好ましい。
本発明の単層および多層フィルムは、前記樹脂組成物を含む層を少なくとも1層含む、単層または多層フィルムである。つまり、本発明の単層フィルムは、前記樹脂組成物を含む層からなるフィルムであり、多層フィルムは、前記樹脂組成物を含む層を少なくとも1層含む多層フィルムである。
本発明のフィルムの用途である二次電池用部材としては、例えば、リチウムイオン電池用タブリードフィルム(以下、単に「タブリードフィルム」ともいう。)、リチウムイオン電池用外装材(以下、単に「外装材」ともいう。)等が挙げられる。ここで、タブリードは、電池における電極と外部との電気の出し入れを行う端子であり、リード基材である金属層と、リード基材の少なくとも片面上に形成されたタブリードフィルムとを有する。
<メルトフローレート(MFR)>
ASTM D1238に従い、プロピレン系重合体は230℃、2.16kg荷重の下、エチレン系重合体は190℃、2.16kg荷重の下、MFRを測定した。
JIS K7112(密度勾配管法)に準拠して密度を測定した。
ポリオレフィン中のα-オレフィン由来の構成単位、およびエチレン由来の構成単位の含有割合の定量化は、13C-NMRにより以下の装置および条件にて行った。
融点は、示差走査熱量計(DSC)を用いて、次のように測定した。試料5mg程度をアルミニウムパン中に密封し、室温から10℃/分で230℃まで加熱し、その試料を、完全融解させるために230℃で10分間保持した。次いで10℃/分で-20℃まで冷却し、-20℃で10分間置いた後、その試料を10℃/分で230℃まで再度加熱した。この2度目の加熱試験でのピーク温度を、融点(Tm)として採用した。
不飽和カルボン酸および/またはその誘導体に由来する構造単位の量(グラフト変性量)は、赤外線吸収分析装置により、前記構造単位に由来するピーク(無水マレイン酸を用いた場合は1790cm-1)の強度を測定し、予め作成した検量線を用いて定量した。
実施例および比較例で得られた接着剤を、Tダイ付き押出成形機により、直径50mm、有効長さL/D=28のスクリューを用いて240℃で押出し、厚さ100μmの単層フィルムを作製した。
実施例および比較例で得られた接着剤を、Tダイ付き押出成形機により、直径50mm、有効長さL/D=28のスクリューを用いて240℃で押出し、25℃に設定した冷却ロールで引き取って、単層100μmのフィルムを成形した。引き取り速度5m/分、10m/分および20m/分の3条件で単層フィルムを成形した。各条件で得られた単層フィルムについて、下記基準によってフィルム成形性を評価した。
成形性〇:冷却ロール通過時にフィルム表面に剥離痕が発生しなかった。
成形性△:冷却ロール通過時にフィルム表面に剥離痕が僅かに発生した。
成形性×:冷却ロール通過時にフィルム表面に剥離痕が著しく発生した。
実施例および比較例で得られた接着剤および市販のポリプロピレン(プライムポリマー社製 F327、MFR:7)を、Tダイ付き押出成形機により、直径50mm、有効長さL/D=28のスクリューを用いて240℃で共押出した。押出された接着剤およびポリプロピレンをフィードブロック内で、接着剤が内層、ポリプロピレンが外層になるように積層し、内層および外層がともに50μmである厚さ100μmの多層フィルムを作製した。
実施例および比較例において使用したポリオレフィンを以下に示す。なお、特に断らない限り、これらポリオレフィンは、いずれも常法に従い重合を行い調製した。
・PP-1:メタロセン系ランダムポリプロピレン
(MFR:8g/10分、密度:0.89g/cm3、プロピレン含量:94mol%、
エチレン含量:6mol%、融点:105℃)
・PP-2:メタロセン系ランダムポリプロピレン
(MFR:7g/10分、密度:0.90g/cm3、プロピレン含量:96mol%、
エチレン含量:4mol%、融点:125℃)
・PP-3:メタロセン系ランダムポリプロピレン
(MFR:7g/10分、密度:0.89g/cm3、プロピレン含量:85mol%、
1-ブテン含量:15mol%、融点98℃)
・PBR:プロピレン・1-ブテンランダム共重合体
(MFR:7g/10分、密度:0.88g/cm3、プロピレン含量:74mol%、
1-ブテン含量:26mol%、融点75℃)
・PER:プロピレン・エチレンランダム共重合体
(MFR:7g/10分、密度:0.87g/cm3、プロピレン含量:84mol%、
エチレン含量:16mol%、融点60℃)
・変性PP:変性ホモポリプロピレン
(MFR:100g/10分、密度:0.90g/cm3、無水マレイン酸グラフト量:
1.5質量%)
・EPR:エチレン・プロピレンランダム共重合体
(MFR:0.6g/10分、密度:0.87g/cm3、エチレン含量:80mol%
、プロピレン含量:20mol%)
<接着剤の製造>
PP-1 80質量部と、EPR 10質量部と、変性PP 10質量部とを、一軸押出機を用いて230℃で溶融混練し、樹脂組成物を得た。この組成物を接着剤1とした。
実施例2~4、比較例1~5において、それぞれ表1に示した配合処方に従い、実施例1と同様の方法で樹脂組成物を製造した。実施例2で得られた組成物を接着剤2、実施例3で得られた組成物を接着剤3、実施例4で得られた組成物を接着剤4、比較例1で得られた組成物を接着剤5、比較例2で得られた組成物を接着剤6、比較例3で得られた組成物を接着剤7、比較例4で得られた組成物を接着剤8、比較例5で得られた組成物を接着剤9とした。
Claims (13)
- 下記(a)を満たすプロピレン系重合体(A)の含有量が10~99.9質量部、
下記(b)を満たすプロピレン系重合体(B)の含有量が0~40質量部、
不飽和カルボン酸及び/又はその誘導体から導かれる構造単位を含有するポリオレフィン(C)の含有量が0.1~20質量部、
下記(d)を満たすエチレン系重合体(D)の含有量が0~40質量部
である(ただし、成分(A)、(B)、(C)および(D)の含有量の合計を100質量部とする)、樹脂組成物:
(a)示差走査熱量測定において観測される融点(Tm)が120℃未満、100℃以上である;
(b)ASTM D1238に準拠して230℃、2.16kg荷重にて測定したMFRが0.01~100g/10分の範囲にあり、かつ下記要件(b-1)および(b-2)を満たす;
(b-1)示差走査熱量測定において観測される融点(Tm)が100℃未満であるか、または融点(Tm)が観測されない;
(b-2)プロピレンから導かれる構成単位と、エチレンおよび炭素原子数4~20のα-オレフィンから選ばれる少なくとも1種のオレフィンから導かれる構成単位とを有し、エチレンおよび炭素原子数4~20から選ばれる少なくとも1種のα-オレフィンから導かれる構成単位の含有量が40mol%以下である;
(d)エチレン単独重合体またはエチレンと炭素原子数3~20のα-オレフィンから選ばれる少なくとも1種のα-オレフィンとの共重合体であり、ASTM D1238に準拠して190℃、2.16kg荷重にて測定したMFRが0.1~10g/10分の範囲である。 - 前記プロピレン系重合体(A)の含有量が10~94.9質量部、
前記プロピレン系重合体(B)の含有量が5~40質量部、
前記ポリオレフィン(C)の含有量が0.1~20質量部、
前記エチレン系重合体(D)の含有量が0~40質量部
である(ただし、成分(A)、(B)、(C)および(D)の含有量の合計を100質量部とする)、請求項1に記載の樹脂組成物。 - 前記プロピレン系重合体(A)の含有量が10~94.9質量部、
前記プロピレン系重合体(B)の含有量が0~40質量部、
前記ポリオレフィン(C)の含有量が0.1~20質量部、
前記エチレン系重合体(D)の含有量が5~40質量部
である(ただし、成分(A)、(B)、(C)および(D)の含有量の合計を100質量部とする)、請求項1に記載の樹脂組成物。 - 前記エチレン系重合体(D)の密度が、0.87g/cm3以下である、請求項3に記載の樹脂組成物。
- 請求項1~4のいずれか1項に記載の樹脂組成物を含む層を少なくとも1層含む、単層または多層フィルム。
- 少なくとも1層の請求項1~4のいずれか1項に記載の樹脂組成物を含む層と、少なくとも2層の前記組成物を含む層以外の他の層とを含み、前記組成物を含む層の両面が前記他の層と接している多層フィルム。
- 少なくとも1層の請求項1~4のいずれか1項に記載の樹脂組成物を含む層と、少なくとも1層の金属含有層、ポリオレフィン層および極性樹脂層から選ばれる層とを含み、前記組成物を含む層が、前記金属含有層、ポリオレフィン層および極性樹脂層のうちの少なくとも1層と接している多層フィルム。
- 請求項5に記載の単層もしくは多層フィルム、または請求項6もしくは7に記載の多層フィルムを含む食品包装材。
- 請求項5に記載の単層もしくは多層フィルム、または請求項6もしくは7に記載の多層フィルムを含む建築・産業用資材。
- 請求項5に記載の単層もしくは多層フィルム、または請求項6もしくは7に記載の多層フィルムを含む二次電池用部材。
- リチウムイオン電池用外装材である請求項10に記載の二次電池用部材。
- リチウムイオン電池用タブリードフィルムである請求項10に記載の二次電池用部材。
- 請求項1~4のいずれか1項に記載の樹脂組成物を溶融押出成形する、単層または多層フィルムの製造方法。
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US20240166856A1 (en) | 2024-05-23 |
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