WO2018180165A1 - 電池用積層体 - Google Patents
電池用積層体 Download PDFInfo
- Publication number
- WO2018180165A1 WO2018180165A1 PCT/JP2018/007746 JP2018007746W WO2018180165A1 WO 2018180165 A1 WO2018180165 A1 WO 2018180165A1 JP 2018007746 W JP2018007746 W JP 2018007746W WO 2018180165 A1 WO2018180165 A1 WO 2018180165A1
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- WIPO (PCT)
- Prior art keywords
- copolymer
- mol
- ethylene
- propylene
- adhesive
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- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
- 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
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
- C08L23/0815—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic 1-olefins containing one carbon-to-carbon double bond
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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
- 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
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
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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
- 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
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
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- 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
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- 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
- C09J123/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/28—Metal sheet
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
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- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/383—Natural or synthetic rubber
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
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- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
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- H01M50/411—Organic material
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- H—ELECTRICITY
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- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/028—Sealing means characterised by their material
- H01M8/0284—Organic resins; Organic polymers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
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- H10F19/804—Materials of encapsulations
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
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- C—CHEMISTRY; METALLURGY
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- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
- C09J2400/16—Metal
- C09J2400/163—Metal in the substrate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- H—ELECTRICITY
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- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
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- Y02E60/10—Energy storage using batteries
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- 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
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- the present invention relates to a laminate for a battery, and relates to a laminate including a novel adhesive layer and a metal base layer.
- polypropylene has been widely used as a thermoplastic molding material having excellent rigidity, heat resistance and transparency. Since this polypropylene is a nonpolar material, it has poor adhesion to polar materials such as ethylene-vinyl alcohol copolymer and metals, and the technology to modify polypropylene with unsaturated carboxylic acid or its derivatives for the purpose of improving adhesion Is widely known. Also, since polypropylene is inferior in flexibility, a soft rubber component is usually blended with polypropylene when used as an adhesive.
- Patent Document 3 the polypropylene adhesive which improved adhesiveness by mix
- polypropylene-based adhesives have also expanded to uses in high-temperature atmospheres, such as electronic information materials, and the adhesives have sufficient adhesion to metals even in high-temperature atmospheres. It is required to show power. Specific applications include food packaging materials and building materials, solar cell electrode protection members, lithium ion battery packaging materials and tab lead materials, fuel cell sealing materials, and the like.
- One embodiment of the present invention provides a battery laminate having excellent adhesion, and particularly excellent adhesion even at high temperatures.
- the present inventor has found that the above-mentioned object can be achieved by contriving the composition of the propylene-based adhesive layer, and has completed the present invention. .
- one embodiment of the present invention relates to a battery laminate including a polypropylene-based adhesive layer (I) satisfying at least the following requirements (1) to (4) and a metal base layer (II).
- the adhesive is 40 to 94% by weight of the propylene copolymer (A), 3 to 30% by weight of butene-containing copolymer (B), 3-30 wt% of ethylene / ⁇ -olefin copolymer (C) (provided that the total of copolymers (A), (B) and (C) is 100 wt%)
- the polymer (A) is a polymer having a melting point (TmA) measured by a differential scanning calorimeter (DSC) of 130 ° C.
- the total of the proportion of structural units derived from ethylene is 4 to 25 mol% with respect to the total of 100 mol% of the structural units constituting all the copolymers (A) contained in the adhesive.
- the union (B) has a content of structural units derived from ethylene of less than 1 mol%,
- the melting point (TmB) measured by DSC is 100 ° C. or less.
- the copolymer (C) has a content of structural units derived from ethylene of 50 to 99 mol%.
- the laminate for a battery according to an embodiment of the present invention is excellent in adhesiveness with a metal base material layer at room temperature, and is also excellent in adhesiveness under a high temperature atmosphere. For this reason, by using this laminated body, it becomes possible to extend the use upper limit temperature of a battery safely, and can simplify the structure of the whole battery.
- a battery laminate (hereinafter also referred to as “the present laminate”) according to an embodiment of the present invention is provided.
- a battery laminate comprising a polypropylene-based adhesive layer (I) satisfying at least the following requirements (1) to (4) and a metal base layer (II).
- the adhesive is 40 to 94% by weight of the propylene copolymer (A), 3 to 30% by weight of butene-containing copolymer (B), 3-30 wt% of ethylene / ⁇ -olefin copolymer (C) (provided that the total of copolymers (A), (B) and (C) is 100 wt%)
- the polymer (A) is a polymer having a melting point (TmA) measured by a differential scanning calorimeter (DSC) of 130 ° C. or higher, The total of the proportion of structural units derived from ethylene is 4 to 25 mol% with respect to the total of 100 mol% of the structural units constituting all the copolymers (A) contained in the adhesive.
- the union (B) has a content of structural units derived from ethylene of less than 1 mol%,
- the melting point (TmB) measured by DSC is 100 ° C. or less.
- the copolymer (C) has a content of structural units derived from ethylene of 50 to 99 mol%.
- the copolymer (A) contained in the adhesive may be one type or two or more types, and the copolymer (B) contained in the adhesive may be one type or two or more types.
- the polymer (C) may also be one type or two or more types.
- the polypropylene adhesive comprises 40 to 94% by weight of the propylene copolymer (A), 3 to 30% by weight of the butene-containing copolymer (B), and 3% of the ethylene / ⁇ -olefin copolymer (C). To 30% by weight (provided that the total of the copolymers (A), (B) and (C) is 100% by weight). Since the polypropylene-based adhesive contains a specific amount of these copolymers, the adhesive layer obtained from the adhesive has a well-balanced adhesion to the metal substrate layer at room temperature and in a high-temperature atmosphere. Excellent.
- TmA The melting point (TmA) measured by a differential scanning calorimeter (DSC) of the propylene copolymer (A) is not particularly limited as long as it is 130 ° C. or higher. TmA is preferably 130 to 160 ° C. When TmA is within the above range, a laminate having excellent adhesion under a high temperature atmosphere can be easily obtained. Specifically, TmA can be measured by the method described in the Examples below.
- the copolymer (A) is a copolymer having a propylene-derived structural unit and is not particularly limited as long as TmA is 130 ° C. or higher, and includes a propylene / ⁇ -olefin copolymer and the like.
- the copolymer (A) is a polymer different from the following copolymer (C) and modified polyolefin (D). Further, it may be a copolymer obtained by using a compound copolymerizable with propylene or ⁇ -olefin in the synthesis of these copolymers.
- the ⁇ -olefin is preferably an ⁇ -olefin having 2 or 4 to 20 carbon atoms, and more preferably an ⁇ -olefin having 2 or 4 to 10 carbon atoms.
- the ⁇ -olefin may be used alone or in combination of two or more.
- the content of structural units derived from ⁇ -olefin in the propylene / ⁇ -olefin copolymer is preferably 1 to 55 mol%, more preferably 2 to 50 mol%, and particularly preferably 2 to 45 mol%.
- the copolymer (A) is composed of propylene / ethylene / ⁇ - and the like in that an adhesive layer excellent in balance with a metal substrate layer at normal temperature and high-temperature atmosphere can be easily obtained. It is preferable that an olefin copolymer is included.
- the ⁇ -olefin is an ⁇ -olefin having 4 or more carbon atoms, more preferably an ⁇ -olefin having 4 to 20 carbon atoms, and a good balance in adhesion to the metal substrate layer at room temperature and in a high-temperature atmosphere. From the viewpoint that an excellent adhesive layer can be easily obtained, ⁇ -olefins having 4 to 10 carbon atoms are more preferable, and 1-butene is particularly preferable.
- the ⁇ -olefin may be used alone or in combination of two or more.
- the content of structural units derived from propylene in the propylene / ethylene / ⁇ -olefin copolymer is preferably 45 to 90 mol%, more preferably 50 to 85 mol%, and particularly preferably 55 to 80 mol%.
- the content of structural units derived from ethylene in the propylene / ethylene / ⁇ -olefin copolymer is preferably 5 to 25 mol%, more preferably 10 to 22 mol%, and particularly preferably 10 to 20 mol%. .
- the content of structural units derived from ⁇ -olefin in the propylene / ethylene / ⁇ -olefin copolymer is preferably 1 to 30 mol%, more preferably 5 to 28 mol%, and particularly preferably 10 to 28 mol%. It is.
- the total sum of the proportion of structural units derived from ethylene (hereinafter also referred to as “ethylene content Z”) is 4 with respect to 100 mol% of the total of the structural units constituting all the copolymers (A) contained in the adhesive. -25 mol%, preferably 5-20 mol%, more preferably 5-15 mol%.
- ethylene content Z is in the above range, an adhesive layer excellent in balance with the metal base material layer at normal temperature and high temperature atmosphere can be easily obtained.
- the said ethylene content Z means the ratio of the structural unit derived from ethylene in this copolymer, when the copolymer (A) contained in an adhesive agent is 1 type. That is, when one type of copolymer (A) is used as the raw material for the adhesive, the copolymer has a content of structural units derived from ethylene in the copolymer of 4 to 25 mol%. A certain copolymer is used. A preferable range of the content of structural units derived from ethylene of the copolymer is the same as the ethylene content Z.
- the copolymer (A) contained in the adhesive is two kinds (the adhesive is derived from a weight% of copolymer A-1 [ethylene in the copolymer A-1].
- the ethylene content Z (mol%) is a value calculated by the following formula.
- Ethylene content Z m ⁇ a / (a + b) + n ⁇ b / (a + b)
- each copolymer has a content of structural units derived from ethylene in the copolymer of 4 to 25 mol%.
- a copolymer may be used, or a copolymer in which the content of structural units derived from ethylene in the copolymer is out of 4 to 25 mol% may be used.
- the ethylene content Z calculated by the above formula should be 4 to 25 mol%.
- the copolymer (A) in which the content of the structural unit derived from ethylene is a predetermined value may be used as the copolymer (A) to be used, or the proportion of the copolymer (A) used may be adjusted.
- the ethylene content Z is calculated in the same manner as in the case of using the two types of copolymers (A).
- the melt flow rate (MFR) [ASTM D 1238 (temperature: 230 ° C., load: 2.16 kg)] of the copolymer (A) is preferably 0.1 to 50 g / 10 min, more preferably 0.5 to 10 g / 10 min.
- MFR melt flow rate
- the density of the copolymer (A) measured based on JIS K7112 is preferably 0.86 to 0.91 g / cm 3 , more preferably 0.87 to 0.91 g / cm 3 .
- the molecular weight distribution (Mw / Mn) of the copolymer (A) is preferably 1.5 to 5.0, more preferably 1.8 to 4.0. Specifically, the molecular weight distribution can be measured by the method described in the Examples below.
- a manufacturing method of a copolymer (A) It does not specifically limit as a manufacturing method of a copolymer (A), It can manufacture by the well-known method using well-known catalysts, such as a Ziegler-Natta catalyst and a metallocene catalyst.
- a copolymer that satisfies the moldability and has a strength that the obtained laminate can withstand use is preferable, and there are no particular restrictions on the stereoregularity or the molecular weight as long as the effects of the present invention are not impaired.
- Commercially available resins can be used as they are.
- the content of the copolymer (A) in the polypropylene-based adhesive is 40 to 94% by weight, preferably 50 to 94% with respect to 100% by weight of the total of the copolymers (A), (B) and (C). 85% by weight, more preferably 55 to 80% by weight.
- the content of the copolymer (A) is in the above range, it is possible to easily obtain an adhesive layer excellent in balance with the metal base material layer at normal temperature and high temperature atmosphere.
- the content of the propylene / ethylene / ⁇ -olefin copolymer with respect to 100% by weight of the copolymer (A) contained in the adhesive is preferably 10% by weight or more, more preferably 10 to 80% by weight, Particularly preferred is 20 to 70% by weight.
- the content of the propylene / ethylene / ⁇ -olefin copolymer is in the above range, it is possible to easily obtain an adhesive layer having a good balance between the adhesion to the metal base material layer at normal temperature and high temperature atmosphere. it can.
- the butene-containing copolymer (B) is a copolymer containing a structural unit derived from butene and having a content of structural units derived from ethylene of less than 1 mol%, but is a propylene / butene copolymer. Preferably there is.
- the said copolymer (B) is a polymer different from the following modified polyolefin (D).
- the content of structural units derived from butene in the copolymer (B) is preferably 10 to 30 mol%, more preferably 12 to 28 mol%.
- the content of structural units derived from propylene in the copolymer (B) is preferably 70 to 90 mol%, more preferably 72 to 88 mol%.
- the melting point (TmB) measured by DSC of the copolymer (B) is 100 ° C. or less, more preferably 60 to 100 ° C.
- TmB can be measured by the method described in the Examples below.
- the MFR [ASTM D 1238 (temperature: 230 ° C., load: 2.16 kg)] of the copolymer (B) is preferably 0.1 to 50 g / 10 minutes, more preferably 0.5 to 10 g / 10 minutes. is there.
- an adhesive layer having an excellent balance between flexibility and mechanical strength and higher adhesive strength can be obtained.
- the density measured based on JIS K7112 of the copolymer (B) is preferably 0.86 to 0.90 g / cm 3 , more preferably 0.87 to 0.90 g / cm 3 .
- the molecular weight distribution (Mw / Mn) of the copolymer (B) is preferably 1.5 to 5.0, more preferably 1.8 to 4.0.
- a manufacturing method of a copolymer (B) It does not specifically limit as a manufacturing method of a copolymer (B), It can manufacture by a well-known method using well-known catalysts, such as a Ziegler-Natta catalyst and a metallocene catalyst.
- a copolymer that satisfies the moldability and has a strength that the obtained laminate can withstand use is preferable, and there are no particular restrictions on the stereoregularity or the molecular weight as long as the effects of the present invention are not impaired.
- Commercially available resins can be used as they are.
- the content of the copolymer (B) in the polypropylene-based adhesive is 3 to 30% by weight with respect to the total 100% by weight of the copolymers (A), (B) and (C), preferably 5 to 30% by weight, more preferably 5 to 25% by weight.
- the content of the copolymer (B) is in the above range, it is possible to easily obtain an adhesive layer excellent in balance with the metal base material layer at normal temperature and high temperature atmosphere.
- the ethylene / ⁇ -olefin copolymer (C) is not particularly limited as long as the content of structural units derived from ethylene is 50 to 99 mol%.
- the said copolymer (C) is a polymer different from the following modified polyolefin (D).
- the content of structural units derived from ethylene in the copolymer (C) is preferably 60 to 95 mol%, more preferably 70 to 90 mol%.
- the ⁇ -olefin is preferably an ⁇ -olefin having 3 to 20 carbon atoms, more preferably an ⁇ -olefin having 3 to 10 carbon atoms, and particularly preferably propylene or butene.
- the content of the structural unit derived from the ⁇ -olefin of the copolymer (C) is preferably 1 to 50 mol%, more preferably 5 to 40 mol%, particularly preferably 10 to 30 mol%.
- the ⁇ -olefin may be used alone or in combination of two or more.
- the MFR [ASTM D 1238 (temperature: 230 ° C., load: 2.16 kg)] of the copolymer (C) is preferably 0.1 to 70 g / 10 minutes, more preferably 0.5 to 20 g / 10 minutes. is there.
- an adhesive layer having an excellent balance between flexibility and mechanical strength and higher adhesive strength can be obtained.
- the density of the copolymer (C) measured based on JIS K7112 is preferably 0.85 to 0.90 g / cm 3 , more preferably 0.86 to 0.89 g / cm 3 .
- the molecular weight distribution (Mw / Mn) of the copolymer (C) is preferably 1.5 to 5.0, more preferably 1.8 to 4.0.
- a manufacturing method of a copolymer (C) It does not specifically limit as a manufacturing method of a copolymer (C), It can manufacture by a well-known method using well-known catalysts, such as a Ziegler-Natta catalyst and a metallocene catalyst.
- a copolymer that satisfies the moldability and has a strength that the obtained laminate can withstand use is preferable, and there are no particular restrictions on the stereoregularity or the molecular weight as long as the effects of the present invention are not impaired.
- Commercially available resins can be used as they are.
- the content of the copolymer (C) in the polypropylene-based adhesive is 3 to 30% by weight with respect to 100% by weight of the total of the copolymers (A), (B) and (C), preferably 5 to 28 wt%, more preferably 10 to 25 wt%.
- the content of the copolymer (C) is in the above range, it is possible to easily obtain an adhesive layer excellent in balance with the metal base material layer at normal temperature and high temperature atmosphere.
- Modified polyolefin (D) The polypropylene-based adhesive is modified with an unsaturated carboxylic acid and / or a derivative thereof from the viewpoint of easily obtaining a laminate having excellent adhesion between the obtained adhesive layer and the metal base layer. It is preferable that the modified polyolefin (D) is included.
- the modified polyolefin (D) contained in the adhesive may be one type or two or more types.
- the modified polyolefin (D) is also referred to as a polyolefin (hereinafter also referred to as “trunk polymer”.
- the trunk polymer may be a structural unit excluding the structural unit derived from the unsaturated carboxylic acid and its derivative in the modified polyolefin (D). And a structural unit derived from the unsaturated carboxylic acid and / or derivative thereof.
- two or more kinds of trunk polymers may be used.
- trunk polymer examples include polypropylene (d1), ethylene / propylene / ⁇ -olefin copolymer (d2), and ethylene / ⁇ -olefin copolymer (d3).
- Polypropylene (d1) is, for example, a propylene homopolymer and / or a propylene / ⁇ -olefin copolymer. It may also contain several different isotactic polypropylenes.
- the ⁇ -olefin is not particularly limited, but preferably includes ethylene and an ⁇ -olefin having 4 to 20 carbon atoms. These ⁇ -olefins may be used alone 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 more preferable.
- the content of the structural unit derived from propylene in the propylene / ⁇ -olefin copolymer is at least 50 mol% or more and less than 100%.
- the production method of polypropylene (d1) is not particularly limited, and a known method using a known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst may be mentioned.
- Polypropylene (d1) is preferably a crystalline polymer, and in the case of a copolymer, it may be a random copolymer or a block copolymer.
- a copolymer that satisfies the moldability and has a strength that the obtained laminate can withstand use is preferable, and there are no particular restrictions on the stereoregularity or the molecular weight as long as the effects of the present invention are not impaired.
- Commercially available resins can be used as they are.
- the ethylene / propylene / ⁇ -olefin copolymer (d2) is, for example, a propylene-derived structural unit of 45 to 89 mol%, an ethylene-derived structural unit of 10 to 25 mol%, and an ⁇ -olefin having 4 to 20 carbon atoms. 1-30 mol% of derived structural units are contained.
- the ⁇ -olefin is preferably an ⁇ -olefin having 4 to 10 carbon atoms.
- the ⁇ -olefin may be used alone or in combination of two or more.
- the content of structural units derived from ethylene is preferably 10 to 22 mol%, more preferably 10 to 20 mol%, and the content of structural units derived from propylene is preferably 50 to 85 mol%.
- the content of the structural unit derived from ⁇ -olefin is preferably 5 to 28 mol%, more preferably 10 to 28 mol%.
- the method for producing the copolymer (d2) is not particularly limited, and examples thereof include a known method using a known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst.
- the copolymer (d2) may be a random copolymer or a block copolymer.
- a copolymer that satisfies the moldability and has a strength that the obtained laminate can withstand use is preferable, and there are no particular restrictions on the stereoregularity or the molecular weight as long as the effects of the present invention are not impaired.
- Commercially available resins can be used as they are.
- the ethylene / ⁇ -olefin copolymer (d3) preferably contains 50 to 99 mol% of structural units derived from ethylene and 1 to 50 mol% of structural units derived from ⁇ -olefin having 3 to 20 carbon atoms.
- ⁇ -olefin an ⁇ -olefin having 3 to 10 carbon atoms is more preferable.
- the ⁇ -olefin may be used alone or in combination of two or more.
- the content of structural units derived from ethylene is more preferably 55 to 98 mol%, particularly preferably 60 to 95 mol%, and the content of structural units derived from ⁇ -olefin is more The amount is preferably 2 to 45 mol%, particularly preferably 5 to 40 mol%.
- the method for producing the copolymer (d3) is not particularly limited, and a known method using a known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst may be mentioned.
- the copolymer (d3) is preferably a crystalline polymer, and may be a random copolymer or a block copolymer. Further, a copolymer that is excellent in moldability and has a strength that the obtained laminate can withstand use is preferable, and there is no particular limitation on the stereoregularity and molecular weight within the range not impairing the effects of the present invention. Commercially available resins can be used as they are.
- the content of structural units derived from propylene in the trunk polymer is preferably 90 to 100 mol%, more preferably 95 to 100 mol%.
- an adhesive layer having excellent heat resistance can be easily obtained.
- Examples of the unsaturated carboxylic acid and / or derivative thereof include unsaturated compounds having at least one carboxylic acid group, esters of unsaturated compounds having a carboxylic acid group and an alkyl alcohol, and unsaturated compounds having at least one carboxylic anhydride group. And saturated compounds.
- Examples of the unsaturated group include a vinyl group, a vinylene group, and an unsaturated cyclic hydrocarbon group.
- unsaturated carboxylic acid and / or derivative thereof unsaturated dicarboxylic acid or acid anhydride thereof is suitable, and maleic acid, nadic acid or acid anhydrides thereof are particularly preferred.
- Unsaturated carboxylic acid and / or its derivative can also be used individually by 1 type, and can also use 2 or more types.
- the amount of the structural unit derived from the unsaturated carboxylic acid and its derivative in the modified polyolefin (D) is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 100 parts by weight of the trunk polymer. -3.5 parts by weight.
- an adhesive layer having an excellent balance between moldability and adhesiveness can be easily obtained.
- a method for modifying the trunk polymer is not particularly limited, but graft polymerization using the trunk polymer and an unsaturated carboxylic acid and / or a derivative thereof is preferable.
- the method for grafting the unsaturated carboxylic acid and / or derivative thereof is not particularly limited, and conventionally known graft polymerization methods such as a solution method and a melt-kneading method can be employed.
- Examples thereof include a method of adding an acid and / or a derivative thereof and causing a graft reaction.
- the structure derived from the unsaturated carboxylic acid and / or its derivative may be further modified with diamine, carbodiimide or the like.
- the content of the modified polyolefin (D) in the polypropylene-based adhesive is preferably 0.1 to 15 parts by weight with respect to 100 parts by weight of the total of the copolymers (A), (B) and (C).
- the amount is preferably 1 to 13 parts by weight, particularly preferably 2 to 12 parts by weight.
- the adhesive may be a propylene homocopolymer, a copolymer other than the polymers (A) to (D), or a styrene-based polymer for the purpose of adjusting rigidity within a range not impairing the effects of the present invention. It may contain an elastomer or the like as appropriate. Further, for the purpose of adjusting the moldability, low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and the like may be appropriately contained.
- LDPE low density polyethylene
- LLDPE linear low density polyethylene
- tackifiers antioxidants, UV absorbers, neutralizers, nucleating agents, light stabilizers, antistatic agents, antiblocking agents, lubricants, tackifiers, odor adsorbents, antibacterial agents, pigments, inorganics
- known additives such as organic fillers and various synthetic resins may be contained as necessary.
- the adhesive preferably contains a so-called tackifier for the purpose of imparting tackiness.
- the tackifier include rosin derivatives, terpene resins, petroleum resins and hydrides thereof. Among these, hydrogenated terpene resins and hydrogenated petroleum resins are preferable.
- the blending amount of the tackifier is preferably 2 to 30% by weight with respect to 100% by weight of the adhesive.
- the adhesive is prepared by combining the copolymers (A) to (C) and, if necessary, the modified polyolefin (D) and the other components by various known methods such as a Henschel mixer, a V blender, a ribbon. Examples thereof include a method of mixing with a blender, a tumbler blender, and the like, and a method of melt-kneading with a single screw extruder, a twin screw extruder, a kneader, a Banbury mixer and the like. In addition, you may granulate or grind
- the MFR based on ASTM D 1238 (temperature: 230 ° C., load: 2.16 kg) of the adhesive is not particularly limited, but is preferable from the viewpoint of being an adhesive excellent in the moldability of the adhesive layer (I). Is 0.1 to 100 g / 10 min, more preferably 0.1 to 30 g / 10 min.
- Density was measured according to JIS K7112 of the adhesive is preferably 0.85 ⁇ 0.91g / cm 3, more preferably 0.86 ⁇ 0.90g / cm 3.
- This laminated body will not be restrict
- the adhesive layer (I) and the metal base layer (II) are preferably in contact with each other from the viewpoint that the effects of the present invention can be further exhibited.
- the polypropylene-based adhesive layer (I) is a layer obtained using the polypropylene-based adhesive, and is preferably a layer made of a polypropylene-based adhesive.
- the laminate is used for a battery, and as the battery, a solar battery, a lithium ion battery, and a fuel battery are preferable.
- Specific uses of this laminate include solar cell sealing materials (glass-cell sealing materials), aluminum frame fixing materials, binders and transparent electrodes for fixing active materials of dye-sensitized solar cells.
- Adhesive layer that fixes the active material and active material, lithium ion battery packaging material (adhesive layer between aluminum and sealant PP), tab lead material (adhesive layer between aluminum and copper and sealant PP), fuel cell Examples include an adhesive layer between separators (titanium, stainless steel, etc.), an adhesive layer between a separator of a fuel battery cell and various gaskets, and the like.
- the thickness of the laminate is not particularly limited and may be appropriately selected depending on the desired use, but is preferably 5 ⁇ m to 100 mm, more preferably 10 ⁇ m to 50 mm.
- the adhesive force (180 ° peel method, tensile tester, 23 ° C., crosshead speed: 200 mm / min) between the adhesive layer (I) and the metal base layer (II) in this laminate is preferably 50 to 500 N / 20 mm, more preferably 100 to 300 N / 20 mm. It can be said that the laminate having the adhesive force in the above range is a laminate excellent in adhesiveness at room temperature.
- the adhesive force (180 ° peel method, tensile tester, 110 ° C., crosshead speed: 200 mm / min) between the adhesive layer (I) and the metal base layer (II) in the laminate is preferably 50 to 500 N / 20 mm, more preferably 60 to 300 N / 20 mm. It can be said that the laminate having the adhesive force in the above range is a laminate excellent in adhesiveness in a high temperature atmosphere.
- This laminate can be produced by melting the polypropylene adhesive and laminating it with the metal base layer (II) in the molten state.
- a laminate by forming an adhesive layer molded in the above and melting the adhesive layer in a state where the adhesive layer and the metal base layer (II) are in contact with each other.
- the means for supplying the heat energy necessary for melting the adhesive layer at this time includes known means, for example, heat press, burner, high-frequency heating, and laser heating.
- the thickness of the polypropylene-based adhesive layer (I) is not particularly limited and may be appropriately selected according to a desired application. However, a battery laminate having sufficient adhesiveness can be easily obtained. From the viewpoint, it is preferably 3 to 500 ⁇ m, more preferably 10 to 400 ⁇ m.
- the metal base layer (II) contains at least one element selected from the group consisting of gold, copper, iron, chromium, zinc, cobalt, aluminum, titanium, tin, indium, magnesium, molybdenum, manganese and silicon. Including.
- Examples of the metal base layer (II) include a metal plate and metal foil made of one element among them, and a plate and foil made of an alloy containing two or more elements of these. As the element, aluminum, iron, stainless steel, titanium and the like are preferable.
- the thickness of the metal base layer (II) is not particularly limited and may be appropriately selected depending on the desired application, but is preferably 2 ⁇ m to 100 mm, more preferably 5 ⁇ m to 50 mm.
- Examples of the other layers include an inorganic layer, a thermoplastic resin layer, and a gas barrier layer.
- the inorganic layer is preferably a layer that covers the surface of the metal base layer (II).
- the inorganic layer is not particularly limited as long as the effects of the present invention are not impaired.
- an oxide, nitride, or the like containing one or more metal elements listed as elements constituting the metal base layer (II) examples include layers made of inorganic compounds such as nitride oxides, sulfides, phosphides, phosphorus oxides, phosphorus nitrides and phosphorus nitride oxides.
- As the metal element aluminum, iron, stainless steel, titanium and the like are preferable.
- thermoplastic resin layer examples include layers made of various thermoplastic resins other than the barrier layers described below, for example, layers made of polyolefin, polyester, polycarbonate, polyacryl, and polyurethane. Specifically, the thermoplastic resin layer is graft-modified. Examples include a layer made of polypropylene, a layer made of thermoplastic propylene elastomer, a layer made of polyester resin, and the like.
- the layer made of the polyester resin may be a layer imparted with printability, easy adhesion, and vapor deposition by adjusting the composition of the raw material forming the layer.
- polyester resin examples include dicarboxylic acids such as isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, and sebacic acid, and oxycarboxylic acids (eg, p-oxybenzoic acid). ) And aliphatic glycols such as ethylene glycol, propylene glycol, butanediol, diethylene glycol, 1,4-cyclohexanedimethanol, neopentyl glycol, and the like.
- the dicarboxylic acid, oxycarboxylic acid and aliphatic glycol can be used alone or in combination of two or more.
- polyester resin examples include PET, polyethylene-2,6-naphthalene dicarboxylate (PEN), and polybutylene terephthalate (PBT).
- the resin may be a copolymer containing 30 mol% or less of the third component.
- the gas barrier layer is not particularly limited, and various known resins having gas barrier properties, such as saponified ethylene / vinyl acetate copolymer (EVOH), polyamide resin (PA), polyvinylidene chloride resin, polyacrylonitrile, etc. And a barrier resin layer using a resin having excellent barrier properties.
- EVOH saponified ethylene / vinyl acetate copolymer
- PA polyamide resin
- PA polyvinylidene chloride resin
- polyacrylonitrile etc.
- a barrier resin layer using a resin having excellent barrier properties such as saponified ethylene / vinyl acetate copolymer (EVOH), polyamide resin (PA), polyvinylidene chloride resin, polyacrylonitrile, etc.
- the EVOH is preferably a polymer having a saponification degree of 90 to 100% obtained by saponifying an ethylene-vinyl acetate copolymer having an ethylene content of 15 to 70 mol%.
- PA examples include nylon 6, nylon 66, nylon 610, nylon 12, nylon 11, MXD nylon, amorphous nylon, and copolymer nylon.
- a laminated body is mentioned.
- MFR According to ASTM D1238, MFR was measured under 230 ° C. and 2.16 kg load.
- Tm Melting point
- the Tm of the copolymer used as a raw material for the following adhesive was measured by differential scanning calorimetry by the following method. About 5 mg of the sample is packed in a special aluminum pan, heated to 320 ° C./min from 30 ° C. to 200 ° C. using DSCPyris 1 or DSC 7 manufactured by PerkinElmer Co., Ltd., held at 200 ° C. for 5 minutes, The temperature was lowered to 10 ° C./min at 10 ° C./min, held at 30 ° C. for another 5 minutes, and then the melting point was determined from the endothermic curve when the temperature was raised at 10 ° C./min. When a plurality of peaks were detected during measurement, the peak temperature detected on the highest temperature side was defined as the melting point (Tm).
- Quantification of the content of structural units derived from propylene, ethylene and ⁇ -olefin was carried out using a JECX400P type nuclear magnetic resonance apparatus manufactured by JEOL Ltd., and mixed with heavy orthodichlorobenzene / heavy benzene (80/20% by volume) Using a solvent, sample concentration 60 mg / 0.6 mL, measurement temperature 120 ° C., observation nucleus 13 C (100 MHz), sequence single pulse proton decoupling, pulse width 4.62 ⁇ sec (45 ° pulse), repeated The measurement was performed under the conditions where the time was 5.5 seconds, the number of integrations was 8000 times, and 29.73 ppm was the reference value for the chemical shift.
- Amount of structural unit derived from unsaturated carboxylic acid and derivative thereof The amount of the structural unit derived from the unsaturated carboxylic acid and its derivative (graft amount) is measured with an infrared absorption analyzer to measure the intensity of the peak derived from the structural unit (1790 cm -1 when maleic anhydride is used). And quantified using a calibration curve prepared in advance.
- Mw and Mw / Mn of the copolymers used as raw materials for the following adhesives are TSKgelGMH6-HT ⁇ 2 and TSKgelGMH6-HTL ⁇ 2 manufactured by Tosoh Corporation (both column sizes are 7.5 mm in diameter and length) 300 mm) was used in series, and measurement was performed using liquid chromatography (Waters, Alliance / GPC2000 type).
- the mobile phase medium uses o-dichlorobenzene containing 0.025 wt% antioxidant (butylhydroxytoluene, Takeda Pharmaceutical Co., Ltd.), the sample concentration is 0.15% (V / W), and the flow rate is The measurement was performed under conditions of 1.0 mL / min and a temperature of 140 ° C.
- the standard polystyrene those manufactured by Tosoh Corporation were used when the molecular weight was 500 to 20,600,000.
- the obtained chromatogram was analyzed using a calibration curve using a standard polystyrene sample by a known method using data processing software Empower2 manufactured by Waters, and the number average molecular weight (Mn), Mw and Mw / Mn were calculated. Calculated.
- Polyolefin used The polyolefin used in Examples and Comparative Examples is shown below. Unless otherwise specified, all of these polyolefins were prepared by polymerization according to conventional methods.
- Modified polyolefin (D) Modified polyolefin (D)
- Example 1 ⁇ Production of propylene-based adhesive> PP (45% by weight), PBER (20% by weight), PBR-1 (10% by weight), EPR (20% by weight), and modified PP (5% by weight) using a single screw extruder Melted and kneaded at 230 ° C. to obtain a propylene-based adhesive.
- the resulting propylene-based adhesive had an MFR of 8.2 g / 10 minutes and a density of 0.89 g / cm 3 .
- a film having a thickness of 50 ⁇ m was formed from the adhesive obtained in Example 1 using an extruder with a T-die.
- the obtained film was sandwiched between two aluminum foils having a thickness of 300 ⁇ m, and heat-sealed with a heat sealer at 160 ° C. and 0.1 MPa for 5 seconds.
- the obtained multilayer film was cut into a width of 20 mm, and the adhesive strength (unit: N / 20 mm) between the aluminum foil and the adhesive layer was measured at a room temperature of 23 ° C. or 180 ° peel using a tensile tester. It measured under 110 degreeC.
- the crosshead speed was 200 mm / min. The results are shown in Table 1.
- Examples 2 to 4 Comparative Examples 1 to 3 Except that a propylene-based adhesive was prepared according to the formulation shown in Table 1, an adhesive was prepared in the same manner as in Example 1, a laminate was produced using the obtained adhesive, and the adhesive strength was measured. did. The results are shown in Table 1.
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Abstract
Description
具体的な用途としては食品包装材や建築用資材、太陽電池の電極保護部材、リチウムイオン電池の包装材やタブリード材、燃料電池セルのシール材等が挙げられる。
(1)前記接着剤が、
プロピレン系共重合体(A)を40~94重量%、
ブテン含有共重合体(B)を3~30重量%、
エチレン・α-オレフィン共重合体(C)を3~30重量%(但し、共重合体(A)、(B)および(C)の合計を100重量%とする。)含む
(2)前記共重合体(A)は、示差走査熱量計(DSC)によって測定される融点(TmA)が130℃以上の重合体であり、
前記接着剤に含まれる全ての共重合体(A)を構成する構造単位の総和100モル%に対する、エチレンに由来する構造単位の割合の総和が4~25モル%である
(3)前記共重合体(B)は、エチレンに由来する構造単位の含量が1モル%未満であり、
DSCによって測定される融点(TmB)が100℃以下である
(4)前記共重合体(C)は、エチレンに由来する構造単位の含量が50~99モル%である
本発明の一実施形態に係る電池用積層体(以下「本積層体」ともいう。)は、
少なくとも下記要件(1)~(4)を満たすポリプロピレン系接着剤層(I)と、金属製基材層(II)とを含む電池用積層体。
(1)前記接着剤が、
プロピレン系共重合体(A)を40~94重量%、
ブテン含有共重合体(B)を3~30重量%、
エチレン・α-オレフィン共重合体(C)を3~30重量%(但し、共重合体(A)、(B)および(C)の合計を100重量%とする。)含む
(2)前記共重合体(A)は、示差走査熱量計(DSC)によって測定される融点(TmA)が130℃以上の重合体であり、
前記接着剤に含まれる全ての共重合体(A)を構成する構造単位の総和100モル%に対する、エチレンに由来する構造単位の割合の総和が4~25モル%である
(3)前記共重合体(B)は、エチレンに由来する構造単位の含量が1モル%未満であり、
DSCによって測定される融点(TmB)が100℃以下である
(4)前記共重合体(C)は、エチレンに由来する構造単位の含量が50~99モル%である
前記ポリプロピレン系接着剤は、プロピレン系共重合体(A)を40~94重量%、ブテン含有共重合体(B)を3~30重量%、エチレン・α-オレフィン共重合体(C)を3~30重量%(但し、共重合体(A)、(B)および(C)の合計を100重量%とする。)含む。
前記ポリプロピレン系接着剤は、これらの共重合体を特定量で含むため、該接着剤から得られる接着剤層は、金属製基材層との常温下および高温雰囲気下での接着性にバランスよく優れる。
前記プロピレン系共重合体(A)の、示差走査熱量計(DSC)によって測定される融点(TmA)は、130℃以上であれば特に限定されない。
TmAは、好ましくは130~160℃である。
TmAが前記範囲にあることで、高温雰囲気下での接着性に優れる積層体を容易に得ることができる。
TmAは、具体的には、下記実施例に記載の方法で測定することができる。
また、これらの共重合体の合成の際に、プロピレンまたはα-オレフィンと共重合可能な化合物を用いて得られる共重合体であってもよい。
該α-オレフィンとしては、炭素数2、4~20のα-オレフィンが好ましく、炭素数2、4~10のα-オレフィンがより好ましい。該α-オレフィンは、1種単独でもよく、2種以上でもよい。
該α-オレフィンは、炭素数4以上のα-オレフィンであり、炭素数4~20のα-オレフィンがより好ましく、金属製基材層との常温下および高温雰囲気下での接着性にバランスよく優れる接着剤層を容易に得ることができる等の点から、炭素数4~10のα-オレフィンがさらに好ましく、1-ブテンが特に好ましい。該α-オレフィンは、1種単独でもよく、2種以上でもよい。
前記プロピレン・エチレン・α-オレフィン共重合体における、エチレンに由来する構造単位の含量は、好ましくは5~25モル%、より好ましくは10~22モル%、特に好ましくは10~20モル%である。
前記プロピレン・エチレン・α-オレフィン共重合体における、α-オレフィンに由来する構造単位の含量は、好ましくは1~30モル%、より好ましくは5~28モル%、特に好ましくは10~28モル%である。
エチレン含量Zが前記範囲にあることで、金属製基材層との常温下および高温雰囲気下での接着性にバランスよく優れる接着剤層を容易に得ることができる。
つまり、前記接着剤の原料として、1種の共重合体(A)を用いる場合、該共重合体としては、該共重合体中のエチレンに由来する構造単位の含量が4~25モル%である共重合体を用いる。該共重合体のエチレンに由来する構造単位の含量の好ましい範囲は、前記エチレン含量Zと同様の範囲である。
エチレン含量Z=m×a/(a+b)+n×b/(a+b)
共重合体中のエチレンに由来する構造単位の含量が4~25モル%を外れる共重合体を用いる場合には、前記式で算出されるエチレン含量Zが、4~25モル%となるように、用いる共重合体(A)の使用割合を調節したり、用いる共重合体(A)として、エチレンに由来する構造単位の含量が所定の値である共重合体(A)を用いればよい。
MFRが前記範囲にあると、柔軟性と機械強度のバランスに優れ、より接着力の高い接着剤層を得ることができる。
分子量分布は、具体的には、下記実施例に記載の方法で測定することができる。
市販の樹脂をそのまま利用することも可能である。
共重合体(A)の含量が前記範囲にあることで、金属製基材層との常温下および高温雰囲気下での接着性にバランスよく優れる接着剤層を容易に得ることができる。
プロピレン・エチレン・α-オレフィン共重合体の含量が前記範囲にあることで、金属製基材層との常温下および高温雰囲気下での接着性にバランスよく優れる接着剤層を容易に得ることができる。
前記ブテン含有共重合体(B)は、ブテンに由来する構造単位を含有し、エチレンに由来する構造単位の含量が1モル%未満である共重合体であるが、プロピレン・ブテン共重合体であることが好ましい。なお、前記共重合体(B)は、下記変性ポリオレフィン(D)とは異なる重合体である。
共重合体(B)のブテンに由来する構造単位の含量は、好ましくは10~30モル%、より好ましくは12~28モル%である。
共重合体(B)のプロピレンに由来する構造単位の含量は、好ましくは70~90モル%、より好ましくは72~88モル%である。
TmBが前記範囲にあることで、常温下および高温雰囲気下での接着性にバランスよく優れる積層体を容易に得ることができる。
TmBは、具体的には、下記実施例に記載の方法で測定することができる。
MFRが前記範囲にあると、柔軟性と機械強度のバランスに優れ、より接着力の高い接着剤層を得ることができる。
市販の樹脂をそのまま利用することも可能である。
共重合体(B)の含量が前記範囲にあることで、金属製基材層との常温下および高温雰囲気下での接着性にバランスよく優れる接着剤層を容易に得ることができる。
前記エチレン・α-オレフィン共重合体(C)は、エチレンに由来する構造単位の含量が50~99モル%である共重合体であれば特に限定されない。なお、前記共重合体(C)は、下記変性ポリオレフィン(D)とは異なる重合体である。
共重合体(C)のエチレンに由来する構造単位の含量は、好ましくは60~95モル%、より好ましくは70~90モル%である。
前記α-オレフィンとしては、炭素数3~20のα-オレフィンが好ましく、炭素数3~10のα-オレフィンがより好ましく、プロピレンまたはブテンが特に好ましい。共重合体(C)のα-オレフィンに由来する構造単位の含量は、好ましくは1~50モル%、より好ましくは5~40モル%、特に好ましくは10~30モル%である。
前記α-オレフィンは、1種単独でもよく、2種以上でもよい。
MFRが前記範囲にあると、柔軟性と機械強度のバランスに優れ、より接着力の高い接着剤層を得ることができる。
市販の樹脂をそのまま利用することも可能である。
共重合体(C)の含量が前記範囲にあることで、金属製基材層との常温下および高温雰囲気下での接着性にバランスよく優れる接着剤層を容易に得ることができる。
前記ポリプロピレン系接着剤は、得られる接着剤層と金属製基材層との接着性に優れる積層体を容易に得ることができる等の点から、不飽和カルボン酸および/またはその誘導体で変性された変性ポリオレフィン(D)を含むことが好ましい。
該接着剤に含まれる変性ポリオレフィン(D)は、1種でも2種以上でもよい。
変性ポリオレフィン(D)では、幹重合体を2種以上用いてもよい。
該α-オレフィンとしては、特に限定されないが、好ましくはエチレンおよび炭素数4~20のα-オレフィンが挙げられ、これらのα-オレフィンは、1種単独でも2種以上であってもよい。好ましいα-オレフィンは、エチレンおよび炭素数4~10のα-オレフィンであり、中でもエチレンおよび炭素数4~8のα-オレフィンがより好適である。ここで、プロピレン・α-オレフィン共重合体における、プロピレンから導かれる構造単位の含有量は少なくとも50モル%以上であり100%未満である。
市販の樹脂をそのまま利用することも可能である。
該α-オレフィンとしては、炭素数4~10のα-オレフィンが好ましい。該α-オレフィンは、1種単独でもよく2種以上でもよい。
市販の樹脂をそのまま利用することも可能である。
該α-オレフィンとしては、炭素数3~10のα-オレフィンがより好適である。該α-オレフィンは、1種単独でもよく2種以上でもよい。
共重合体(d3)において、エチレン由来の構造単位の含量は、より好ましくは55~98モル%、特に好ましくは60~95モル%であり、α-オレフィンン由来の構造単位の含量は、より好ましくは2~45モル%、特に好ましくは5~40モル%である。
市販の樹脂をそのまま利用することも可能である。
前記幹重合体中のプロピレン由来の構造単位の含量が前記範囲にあると、耐熱性に優れる接着剤層を容易に得ることができる。
不飽和基としては、ビニル基、ビニレン基、不飽和環状炭化水素基等が挙げられる。
前記不飽和カルボン酸および/またはその誘導体としては、不飽和ジカルボン酸またはその酸無水物が好適であり、特にマレイン酸、ナジック酸またはこれらの酸無水物が好ましい。
不飽和カルボン酸および/またはその誘導体は、1種単独で使用することもできるし、2種以上を使用することもできる。
不飽和カルボン酸およびその誘導体に由来する構造単位の量が前記範囲にあると、成形性と接着性とのバランスに優れる接着剤層を容易に得ることができる。
不飽和カルボン酸および/またはその誘導体をグラフトさせる方法については、特に限定されず、溶液法、溶融混練法等、従来公知のグラフト重合法を採用することができる。例えば、前記幹重合体を溶融し、そこに不飽和カルボン酸および/またはその誘導体を添加してグラフト反応させる方法、または、前記幹重合体を溶媒に溶解して溶液とし、そこに不飽和カルボン酸および/またはその誘導体を添加してグラフト反応させる方法等が挙げられる。
変性ポリオレフィン(D)の含量が前記範囲にあることで、金属製基材層との接着性に優れる接着剤層を容易に得ることができる。
前記接着剤には、本発明の効果を損なわない範囲で、剛性を調整する等の目的で、プロピレン単独共重合体、前記重合体(A)~(D)以外の共重合体、またはスチレン系エラストマーなどを適宜含有していてもよい。また、成形性を調整する等の目的で、低密度ポリエチレン(LDPE)や線状低密度ポリエチレン(LLDPE)などを適宜含有していてもよい。
粘着付与剤の配合量は、接着剤100重量%に対し、好ましくは2~30重量%である。
前記接着剤は、前記共重合体(A)~(C)、ならびに、必要に応じて前記変性ポリオレフィン(D)および前記その他の成分を、種々公知の方法、例えば、ヘンシェルミキサー、Vブレンダー、リボンブレンダー、タンブラーブレンダーなどで混合する方法、一軸押出機、二軸押出機、ニーダー、バンバリーミキサーなどで溶融混練する方法が挙げられる。なお、必要により、前記混合で得られた混合物や溶融混錬で得られた溶融混練物を造粒または粉砕してもよい。
本積層体は、ポリプロピレン系接着剤層(I)と金属製基材層(II)とを有すれば特に制限されず、所望の用途に応じて他の層を有していてもよい。
本積層体は、本発明の効果をより発揮できる等の点から、前記接着剤層(I)と金属製基材層(II)とは接していることが好ましい。
なお、ポリプロピレン系接着剤層(I)は、前記ポリプロピレン系接着剤を用いて得られる層であり、ポリプロピレン系接着剤からなる層であることが好ましい。
本積層体の具体的な用途としては、太陽電池の封止材(ガラスとセル間の封止材)やアルミフレームの固定材、色素増感太陽電池の活物質同士を固定するバインダーや透明電極と活物質とを固定する接着層、リチウムイオン電池の包装材(アルミニウムとシーラントPPとの間の接着層)、タブリード材(アルミニウムや銅とシーラントPPとの間の接着層)、燃料電池セルのセパレーター(チタンやステンレスなど)同士の接着層、燃料電池セルのセパレーターと各種ガスケットとの間の接着層等が挙げられる。
該接着力が前記範囲にある積層体は、常温下での接着性に優れる積層体といえる。
該接着力が前記範囲にある積層体は、高温雰囲気下での接着性に優れる積層体といえる。
前記金属製基材層(II)は、金、銅、鉄、クロム、亜鉛、コバルト、アルミニウム、チタン、錫、インジウム、マグネシウム、モリブデン、マンガンおよび珪素からなる群より選ばれる少なくとも1種の元素を含む。
前記金属製基材層(II)は、これらのうち1つの元素からなる金属板や金属箔、これらのうち2つ以上の元素を含む合金からなる板や箔等が挙げられる。
前記元素としては、アルミニウム、鉄、ステンレス、チタン等が好ましい。
前記他の層としては、無機物層、熱可塑性樹脂層、ガスバリア層等が挙げられる。
該無機物層としては、本発明の効果を損なわない限り特に制限されないが、例えば、前記金属製基材層(II)を構成する元素として挙げた金属元素を1つ以上含む酸化物、窒化物、窒酸化物、硫化物、リン化物、リン酸化物、リン窒化物およびリン窒酸化物などの無機化合物からなる層が挙げられる。
該金属元素としては、アルミニウム、鉄、ステンレス、チタン等が好ましい。
前記ジカルボン酸、オキシカルボン酸および脂肪族グリコールはそれぞれ、1種または2種以上を用いることができる。
ASTM D1238に従い、230℃、2.16kg荷重の下、MFRを測定した。
JIS K7112に準拠して密度を測定した。
下記方法により示差走査熱量測定することで、下記接着剤の原料として用いた共重合体のTmを測定した。
試料5mg程度を専用アルミパンに詰め、(株)パーキンエルマー製DSCPyris1またはDSC7を用い、30℃から200℃まで320℃/minで昇温し、200℃で5分間保持した後、200℃から30℃まで10℃/minで降温し、30℃でさらに5分間保持し、次いで10℃/minで昇温する際の吸熱曲線より融点を求めた。
測定時に、複数のピークが検出された場合は、最も高温側で検出されるピーク温度を融点(Tm)と定義した。
下記接着剤の原料として用いた共重合体中のプロピレン由来の構造単位、エチレン由来の構造単位およびα-オレフィン由来の構造単位の含量は、13C-NMRにより以下の装置および条件にて測定した。
プロピレン、エチレンおよびα-オレフィン由来の構造単位の含量の定量化は、日本電子(株)製JECX400P型核磁気共鳴装置を用い、溶媒として重オルトジクロロベンゼン/重ベンゼン(80/20容量%)混合溶媒を用い、試料濃度を60mg/0.6mL、測定温度を120℃、観測核を13C(100MHz)、シーケンスをシングルパルスプロトンデカップリング、パルス幅を4.62μ秒(45°パルス)、繰り返し時間を5.5秒、積算回数を8000回、29.73ppmをケミカルシフトの基準値とする条件下で測定した。
下記接着剤に用いた共重合体(A)の使用量と、前記ポリマーの組成で測定した該共重合体(A)中のエチレンに由来する構造単位の含量とから、前記式に基づいて、接着剤に含まれる共重合体(A)を構成する構造単位の総和100モル%に対する、エチレンに由来する構造単位の割合の総和(エチレン含量Z)を算出した。
不飽和カルボン酸およびその誘導体に由来する構造単位の量(グラフト量)は、赤外線吸収分析装置により、該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。
下記接着剤の原料として用いた共重合体のMwおよびMw/Mnは、東ソー(株)製TSKgelGMH6-HT×2本およびTSKgelGMH6-HTL×2本(カラムサイズはいずれも直径7.5mm、長さ300mm)を直列接続したカラムを用い、液体クロマトグラフィー(Waters社製、Alliance/GPC2000型)を用いて測定した。移動相媒体は、0.025重量%の酸化防止剤(ブチルヒドロキシトルエン、武田薬品工業(株)製)含有o-ジクロロベンゼンを用い、試料濃度を0.15%(V/W)、流速を1.0mL/分、温度を140℃とする条件下で測定を行った。標準ポリスチレンは、分子量が500~20,600,000の場合については東ソー(株)製を用いた。
得られたクロマトグラムはWaters社製データ処理ソフトEmpower2を用い、公知の方法によって、標準ポリスチレンサンプルを使用した検量線を用いて解析することで、数平均分子量(Mn)、MwおよびMw/Mnを算出した。
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:ランダムポリプロピレン
(MFR=7.0g/10分、密度=0.90g/cm3、エチレン含量=3mol%、プロピレン含量=96mol%、ブテン含量=1mol%、融点=140℃)
・PBER:エチレン・プロピレン・α-オレフィン共重合体
(MFR=7.0g/10分、密度=0.87g/cm3、エチレン含量=13mol%、プロピレン含量=68mol%、ブテン含量=19mol%、融点=140℃、Mw/Mn=2.1)
・PBR-1:プロピレン・ブテンランダム共重合体
(MFR=7.0g/10分、密度=0.88g/cm3、プロピレン含量=74mol%、ブテン含量=26mol%、融点=75℃、Mw/Mn=2.1)
・PBR-2:プロピレン・ブテンランダム共重合体
(MFR=7.0g/10分、密度=0.89g/cm3、プロピレン含量=85mol%、ブテン含量=15mol%、融点=98℃、Mw/Mn=2.2)
・EPR:エチレン・α-オレフィン共重合体
(MFR=8.0g/10分、密度=0.87g/cm3、エチレン含量=80mol%、プロピレン含量=20mol%、Mw/Mn=2.1)
・EBR:エチレン・α-オレフィン共重合体
(MFR=8.0g/10分、密度=0.87g/cm3、エチレン含量=85mol%、ブテン含量=15mol%、Mw/Mn=2.1)
・変性PP:変性アイソタクティック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=3.0wt%)
<プロピレン系接着剤の製造>
PP(45重量%)と、PBER(20重量%)と、PBR-1(10重量%)と、EPR(20重量%)と、変性PP(5重量%)とを、一軸押出機を用いて230℃で溶融混練し、プロピレン系接着剤を得た。得られたプロピレン系接着剤のMFRは8.2g/10分であり、密度は0.89g/cm3であった。
Tダイ付き押出成形機により、実施例1で得られた接着剤から厚さ50μmのフィルムを成形した。得られたフィルムを厚み300μmの2枚のアルミ箔で挟み、ヒートシーラーにて160℃、0.1MPaの条件で5秒間ヒートシールした。得られた多層フィルムを20mm幅に切り、アルミ箔と接着剤層との接着力(単位:N/20mm)を、引張試験機を使用して、180°ピール法にて、室温23℃下または110℃下で測定した。クロスヘッドスピードは200mm/minとした。結果を表1に示す。
表1に示す配合処方に従ってプロピレン系接着剤を調製した以外は、実施例1と同様の方法で接着剤を調製し、得られた接着剤を用いて積層体を製造し、その接着力を測定した。結果を表1に示す。
Claims (12)
- 少なくとも下記要件(1)~(4)を満たすポリプロピレン系接着剤層(I)と、金属製基材層(II)とを含む電池用積層体。
(1)前記接着剤が、プロピレン系共重合体(A)、ブテン含有共重合体(B)およびエチレン・α-オレフィン共重合体(C)を含み、これらの合計100重量%に対し、
前記共重合体(A)を40~94重量%、
前記共重合体(B)を3~30重量%、
前記共重合体(C)を3~30重量%含む
(2)前記共重合体(A)は、示差走査熱量計によって測定される融点が130℃以上の重合体であり、
前記接着剤に含まれる全ての共重合体(A)を構成する構造単位の総和100モル%に対する、エチレンに由来する構造単位の割合の総和が4~25モル%である
(3)前記共重合体(B)は、エチレンに由来する構造単位の含量が1モル%未満であり、
示差走査熱量計によって測定される融点が100℃以下である
(4)前記共重合体(C)は、エチレンに由来する構造単位の含量が50~99モル%である - 前記ポリプロピレン系接着剤が、前記共重合体(A)、(B)および(C)の合計100重量部に対し、不飽和カルボン酸およびその誘導体から選ばれる少なくとも1つで変性された変性ポリオレフィン(D)を0.1~15重量部含む、請求項1に記載の電池用積層体。
- 前記共重合体(A)が、前記接着剤に含まれる共重合体(A)100重量%に対し、プロピレン・エチレン・α-オレフィン共重合体を10重量%以上含み、該α-オレフィンの炭素数は4以上である、請求項1または2に記載の電池用積層体。
- 前記プロピレン・エチレン・α-オレフィン共重合体がプロピレン・エチレン・1-ブテン共重合体である、請求項3に記載の電池用積層体。
- 前記変性ポリオレフィン(D)が、前記不飽和カルボン酸およびその誘導体に由来する構造単位を除いた構造単位100重量部に対し、不飽和カルボン酸およびその誘導体に由来する構造単位を0.01~5重量部含有し、
さらに、変性ポリオレフィン(D)において、前記不飽和カルボン酸およびその誘導体に由来する構造単位を除いた構造単位におけるプロピレン由来の構造単位の含量が90~100モル%である、
請求項2に記載の電池用積層体。 - 前記共重合体(A)が、プロピレン・α-オレフィン共重合体であり、
該α-オレフィンの炭素数が2、4~20であり、
前記共重合体(A)は、該α-オレフィン由来の構造単位の含量が1~55モル%であり、ASTM D 1238に準拠して、温度230℃、荷重2.16kgで測定したメルトフローレートが0.1~50g/10分である、
請求項1~5のいずれか1項に記載の電池用積層体。 - 前記共重合体(B)は、ブテン由来の構造単位を10~30モル%、プロピレン由来の構造単位を90~70モル%含有し、ASTM D 1238に準拠して、温度230℃、荷重2.16kgで測定したメルトフローレートが0.1~50g/10分である、
請求項1~6のいずれか1項に記載の電池用積層体。 - 前記共重合体(C)のASTM D 1238に準拠して、温度230℃、荷重2.16kgで測定したメルトフローレートが、0.1~70g/10分である、
請求項1~7のいずれか1項に記載の電池用積層体。 - 前記電池が太陽電池である、請求項1~8のいずれか1項に記載の電池用積層体。
- 前記電池がリチウムイオン電池である、請求項1~8のいずれか1項に記載の電池用積層体。
- 前記電池が燃料電池である、請求項1~8のいずれか1項に記載の電池用積層体。
- 前記金属製基材層(II)が、金、銅、鉄、クロム、亜鉛、コバルト、アルミニウム、チタン、錫、インジウム、マグネシウム、モリブデン、マンガンおよび珪素からなる群より選ばれる少なくとも1種の元素を含む、請求項1~11のいずれか1項に記載の電池用積層体。
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| JP2019509040A JP6776442B2 (ja) | 2017-03-29 | 2018-03-01 | 電池用積層体 |
| EP18774552.6A EP3604472B1 (en) | 2017-03-29 | 2018-03-01 | Laminate for battery |
| US16/488,432 US11685843B2 (en) | 2017-03-29 | 2018-03-01 | Laminate for battery |
| KR1020197023743A KR102277614B1 (ko) | 2017-03-29 | 2018-03-01 | 전지용 적층체 |
| CN201880012073.9A CN110300783B (zh) | 2017-03-29 | 2018-03-01 | 电池用叠层体 |
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| JPWO2022196220A1 (ja) * | 2021-03-15 | 2022-09-22 | ||
| JP7173420B1 (ja) * | 2021-02-10 | 2022-11-16 | 大日本印刷株式会社 | 固体高分子形燃料電池用ガスケット部材、ガスケット部材付き電極-電解質膜積層体、及び固体高分子形燃料電池 |
| JPWO2023022168A1 (ja) * | 2021-08-18 | 2023-02-23 | ||
| WO2023249043A1 (ja) * | 2022-06-22 | 2023-12-28 | 三井化学株式会社 | 樹脂組成物ならびに単層および多層フィルム |
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| EP3604472A1 (en) | 2020-02-05 |
| KR102277614B1 (ko) | 2021-07-15 |
| CN110300783A (zh) | 2019-10-01 |
| TWI758446B (zh) | 2022-03-21 |
| US11685843B2 (en) | 2023-06-27 |
| US20200002577A1 (en) | 2020-01-02 |
| CN110300783B (zh) | 2021-01-12 |
| JPWO2018180165A1 (ja) | 2020-05-14 |
| JP6776442B2 (ja) | 2020-10-28 |
| EP3604472B1 (en) | 2021-09-01 |
| TW201900806A (zh) | 2019-01-01 |
| EP3604472A4 (en) | 2021-01-06 |
| KR20190102078A (ko) | 2019-09-02 |
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