WO2012133663A1 - 成形用包装材および電池用ケース - Google Patents
成形用包装材および電池用ケース Download PDFInfo
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- WO2012133663A1 WO2012133663A1 PCT/JP2012/058393 JP2012058393W WO2012133663A1 WO 2012133663 A1 WO2012133663 A1 WO 2012133663A1 JP 2012058393 W JP2012058393 W JP 2012058393W WO 2012133663 A1 WO2012133663 A1 WO 2012133663A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
- H01M50/1245—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure characterised by the external coating on the casing
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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
- B32B15/08—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 of synthetic resin
- B32B15/085—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 of synthetic resin comprising polyolefins
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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
- B32B15/08—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 of synthetic resin
- B32B15/088—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 of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
- H01M50/126—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure comprising three or more layers
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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
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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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
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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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
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/738—Thermoformability
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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
- B32B2439/00—Containers; Receptacles
- B32B2439/80—Medical 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
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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
- 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 laminate-type molding packaging material which is formed into a tray shape by drawing or stretch molding and used for use. More specifically, for example, it is suitably used as a case material for a secondary battery such as a lithium-ion battery for a notebook computer, a mobile phone, an in-vehicle use, or a stationary power supply, or as a packaging material for foods, pharmaceuticals, etc.
- a laminate packaging material suitably used.
- Patent Document 1 As a packaging material for foods such as retort foods, pharmaceuticals or industrial chemicals, a metal foil having an excellent barrier property against oxygen and moisture is used in order to prevent chemical changes, deterioration, and decay of the contents. Conventionally, a laminate packaging material in which a metal foil is laminated between a base film and a sealant layer has been widely used (see Patent Document 1).
- Lithium ion polymer secondary batteries are increasingly used.
- the electrolytic solution in the battery reacts with water to generate hydrofluoric acid, the battery performance deteriorates or liquid leakage occurs due to corrosion of the case.
- a laminate packaging material similar to the above that has excellent water vapor barrier properties and high sealing properties has been used.
- a laminate packaging material is used in which an inner sealant layer made of a heat-adhesive polyolefin resin for sealing the polymer electrolyte of the contents is sequentially laminated and integrated (see Patent Documents 2 and 3).
- the laminate packaging material for the battery case is formed into a three-dimensional rectangular parallelepiped shape by overhang molding or deep drawing to increase the capacity as much as possible to be filled with the polymer electrolyte, and used as a battery case. Often served.
- the laminate packaging material as described above which is conventionally known, is generally inferior in formability when formed into a tray shape, and may cause cracks or pinholes due to stretch forming or draw forming.
- many of the conventional laminated packaging materials described above are two-component mixed adhesives in which an aluminum foil as a barrier layer and an inner sealant layer are mixed with a main agent having a general hydroxyl group and a curing agent having an isocyanate group. Since the adhesive strength of the content causes the laminate strength between the aluminum foil and the sealant layer to deteriorate over time, the content of the electrolyte solution may eventually leak. There was a problem that the life could not be extended.
- the present invention has been made in view of such a technical background, and firstly, a molding packaging which first improves the moldability and enables sharp and deep molding without generating cracks and pinholes.
- the purpose is to provide materials.
- the present invention can prevent the interlayer laminate strength from being lowered due to the influence of the electrolytic solution, and the interlayer laminate strength is lowered due to the effects of heat generation due to repeated charge and discharge and expansion and contraction of the packaging material.
- the present invention provides the following means.
- a molding packaging material including an outer base material layer made of a heat-resistant resin, an inner sealant layer made of a thermoplastic resin, and a metal foil as a barrier layer disposed between both layers, A mat coat layer made of a heat-resistant resin composition in which inorganic and / or organic solid fine particles are dispersed and contained is coated on the outer surface of the outer base layer, A molding packaging material characterized in that the gloss value on the surface of the mat coat layer is set to 30% or less.
- a molding packaging material including an outer base material layer made of a heat-resistant resin, an inner sealant layer made of a thermoplastic resin, and a metal foil as a barrier layer disposed between both layers, A chemical conversion treatment is applied to at least the inner surface of the metal foil layer, and an inner adhesive resin layer having adhesion to both the metal foil of the barrier layer and the resin of the inner sealant layer is laminated on the chemical conversion treatment surface, and this The inner sealant layer is laminated via an adhesive resin layer,
- the outer base layer is made of a biaxially stretched polyamide resin film, Further, a mat coat layer made of a resin composition in which inorganic and / or organic solid fine particles are dispersed and contained in a heat-resistant resin component is applied and formed on the outer surface of the outer base layer.
- a molding packaging material characterized in that the gloss value on the surface of the mat coat layer is set to 30% or less.
- the heat-resistant resin composition of the mat coat layer is obtained by dispersing 0.1 to 60% by weight of inorganic and / or organic solid fine particles having an average particle diameter of 1 to 10 ⁇ m in a heat-resistant resin component.
- the molding packaging material according to any one of [1] to [6] above, wherein
- a chemical conversion treatment is performed on at least one surface of the metal foil for the barrier layer, and an outer base material layer is formed by adhering a biaxially stretched polyamide film to the other surface of the metal foil with an outer adhesive.
- a two-component curable heat-resistant resin comprising a copolymer of tetrafluoroolefin and carboxylic acid vinyl ester on the surface of the outer base layer, and an inorganic and / or organic material having an average particle diameter of 1 to 10 ⁇ m.
- a process of forming an inner adhesive resin layer having adhesiveness on both the metal foil of the barrier layer and a resin of the inner sealant layer described later on one chemical conversion treatment surface of the foil, and a thermoplastic resin on the inner adhesive resin layer Become A step of laminating and forming a sealant layer, and a step of heat-treating the laminate obtained as described above with a hot roll heated to 130 ° C. to 220 ° C. so that the outer substrate layer is on the hot roll side.
- a method for producing a molding packaging material characterized by the above.
- the thermoplastic resin of the sealant layer is composed of a homopolymer of propylene or a copolymer resin containing at least propylene and ethylene as a copolymer component, and has a melting point of 130 ° C. to 160 ° C. and MFR of 1 to 25 g /
- the inner adhesive resin layer contains a polyolefin resin having a carboxyl group and a polyfunctional isocyanate compound, and an equivalent ratio of an isocyanate group of the polyfunctional isocyanate compound to a hydroxyl group constituting the carboxyl group of the polyolefin resin [NCO]
- a mat coat layer made of a heat-resistant resin composition in which inorganic and / or organic solid fine particles are dispersed and formed is formed on the outer surface of the outer base material layer made of a heat-resistant resin.
- the gloss value is controlled to 30% or less, good slipperiness is imparted to the surface of the packaging material. That is, when the gloss value exceeds 30%, the surface strength decreases and the slipperiness of the surface decreases, so by setting it to a value less than that, the desired formability of the present invention is achieved.
- An excellent packaging material can be provided.
- the gloss value is a value measured at an incident angle of 60 ° in accordance with JISK7105.
- a molding packaging material comprising an outer base material layer, an inner sealant layer, and a metal foil layer disposed between these two layers, and at least an inner surface of the metal foil layer is subjected to chemical conversion treatment. Since the adhesive resin layer having adhesiveness is laminated on both the metal foil and the resin of the inner sealant layer, the laminate strength between the sealant layer and the metal foil layer is sufficiently ensured. Can do. Further, since the outer base layer is a biaxially stretched polyamide film, the moldability is excellent, and the surface is coated with a heat resistant resin composition in which inorganic and / or organic solid fine particles are dispersedly dispersed.
- the mat coat layer having a gloss value of 30% or less Since the mat coat layer having a gloss value of 30% or less is formed, the surface slipperiness is excellent and the moldability is excellent, and even if the electrolytic solution adheres, the appearance is not impaired. Therefore, for example, when used as a battery case, it is possible to prevent the interlaminar laminate strength between the barrier layer and the inner sealant layer of the metal foil from decreasing due to the influence of the electrolyte, It is possible to prevent the interlaminar laminate strength from being lowered under the influence of the expansion and contraction of the film, and to ensure a sufficient sealing performance. Moreover, since the chemical conversion treatment is performed on at least one surface of the metal foil layer, corrosion of the metal foil surface by the contents (battery electrolyte, food, medicine, etc.) can be sufficiently prevented.
- the heat-resistant resin composition of the mat coat layer contains a heat-resistant resin in which fluorine is added to the skeleton of the main component as a main component, thereby further improving the surface slipperiness.
- a heat-resistant resin in which fluorine is added to the skeleton of the main component as a main component, thereby further improving the surface slipperiness.
- the heat-resistant resin of the invention of [5] further contains a urethane resin and / or an acrylic resin, it is good for itself while improving the strength of the mat coat layer. Formability can be imparted.
- inorganic and / or organic solid fine particles having an average particle diameter of 1 to 10 ⁇ m are used as a material for controlling the surface gloss value of the mat coat layer, and 0.1 to 60 in the heat resistant resin component. Since the dispersion content is within the range of% by weight, the gloss value of the mat coat layer can be easily controlled to 30% or less, preferably 1 to 15% or less.
- the sealant layer is formed of a propylene homopolymer or a copolymer resin containing at least propylene and ethylene as a copolymer component, sufficient heat resistance can be secured and excellent. Seal performance can be secured.
- the melting point of the polymer or copolymer of the invention of [8] is 130 to 160 ° C. and the MFR is 1 to 25 g / 10 min, it is possible to ensure sufficient heat resistance and at the time of sealing. Appropriate fluidity can be achieved and excellent sealing performance can be secured.
- the inner adhesive resin layer is an adhesive containing a polyolefin resin having a carboxyl group and a polyfunctional isocyanate compound. It is possible to effectively reduce and prevent the laminate strength between the inner sealant layers from decreasing with time.
- the equivalent ratio [NCO] / [OH] of the isocyanate group of the polyfunctional isocyanate compound to the hydroxyl group constituting the carboxyl group of the polyolefin resin in the adhesive is 1.0 to 10.0.
- a chemical conversion treatment is performed on at least one surface of the metal foil for the barrier layer, and a biaxially stretched polyamide film is adhered to the other surface of the metal foil with an outer adhesive.
- a process for producing a molding packaging material characterized in that the molding packaging material having various effects as described above can be produced efficiently, in particular, metal foil and polypropylene. It can have sufficient laminate strength between the layers.
- the obtained packaging material for molding is molded into a battery case, for example, it is possible to prevent the interlayer laminate strength from decreasing due to the influence of the electrolytic solution, heat generation due to repeated charge and discharge, and expansion of the packaging material, It is also possible to prevent a decrease in interlayer laminate strength due to the shrinkage, and to ensure a sufficient sealing performance.
- the metal foil layer of the barrier layer on which the treatment liquid is applied is subjected to chemical conversion treatment, the metal foil surface is sufficiently corroded by the contents (battery electrolyte, food, medicine, etc.) A packaging material for molding that can be prevented can be produced.
- a mat coat layer having a surface gloss value of 1 to 30% made of a specific heat resistant resin composition in which solid fine particles such as silica are dispersed and contained is provided on the surface of the outer base material layer made of a heat resistant resin. Therefore, it is possible to obtain a packaging material having appropriate irregularities on the surface, good slipperiness and excellent moldability.
- the thermoplastic resin of the inner sealant layer contains at least propylene and ethylene as propylene homopolymers or copolymer components, a melting point of 130 ° C. to 160 ° C., and an MFR of 1 g / 10 min to 15 g / 10 min. Since the polymer or copolymer resin is used, it is possible to produce a molding packaging material that has sufficient heat resistance and can achieve appropriate fluidity at the time of sealing and has excellent sealing performance.
- the inner adhesive resin layer contains a polyolefin resin having a carboxyl group and a polyfunctional isocyanate compound, and the isocyanate group of the polyfunctional isocyanate compound with respect to the hydroxyl group constituting the carboxyl group of the polyolefin resin. Since it is formed by applying and drying an adhesive resin having an equivalent ratio [NCO] / [OH] of 1.0 to 10.0, the adhesive strength between the metal foil and the inner sealant layer by the battery electrolyte Is sufficiently suppressed over a long period of time. Therefore, since it has excellent electrolytic solution resistance and has a small amount of moisture permeation, a long-life stable battery case packaging material can be produced.
- FIG. 1 shows a preferred embodiment of a molding packaging material 1 according to the present invention.
- This molding packaging material (1) is formed into, for example, a substantially rectangular parallelepiped shape having an open upper surface and used as a case of a lithium ion polymer secondary battery.
- an outer base material layer (2) made of a heat-resistant resin film is laminated and integrated on one surface of a metal foil (4) as a barrier layer via an adhesive layer (11).
- a matt resin layer (6) is formed by applying a curable resin composition.
- the inner side adhesive resin layer (5) which has adhesiveness with respect to both the metal foil (4) and the interface resin of a post-sealant layer (3) is provided on the other surface (4a) of the metal foil (4).
- An inner sealant layer (3) made of polypropylene resin is laminated and integrated.
- the outer base layer (2) may have a single-layer configuration with a specific heat-resistant resin, or may have a multilayer configuration with heat-resistant resins having different types or properties.
- the inner sealant layer (3) only needs to have a heat-adhesive resin layer made of polypropylene at least in its innermost layer, and the inner sealant layer (5) and the innermost layer of the inner sealant layer (3) Another intermediate resin layer may be interposed therebetween.
- the intervening intermediate resin layer can be regarded as a part of the sealant layer (3) in the present invention.
- the inner adhesive resin layer (5) may be, for example, a single composition of a polypropylene resin having a carboxyl group or a mixture of two or more kinds of resins having different melting points.
- the outer base material layer (2) made of a heat-resistant resin bears strength as a packaging material and good moldability, and is not particularly limited, but polyamides such as 6 nylon, 66 nylon, and MXD nylon A resin or a polyester resin is preferably used, and among them, a biaxially stretched polyamide resin film, particularly 6 nylon is preferably used.
- the heat-resistant resin film layer may be a single layer or a laminate of two or more types of films.
- the thickness of the outer substrate layer (2) is preferably set to about 12 to 50 ⁇ m, preferably about 15 to 30 ⁇ m.
- the mat coat layer (6) plays a main role in the present invention for improving moldability and preventing appearance loss due to adhesion of an electrolytic solution, etc., and an inorganic and / or organic solid in the heat-resistant resin component. It is formed by applying a treatment liquid made of a resin composition in which fine particles are dispersed and dried. By forming the mat coat layer (6), the gloss value of the outer surface of the packaging material (1) is controlled to 30% or less, particularly preferably 1 to 15%, and more preferably about 2 to 10%.
- the gloss value exceeds 30%, the effect of improving moldability is poor. However, even if it is set to less than 1%, there is no merit due to the improvement of the same effect. Rather, the demerits such as the deterioration of the surface appearance and the increase in cost are larger.
- the heat-resistant resin used for the mat coat layer (6) is not particularly limited, but a resin whose main component is a polyol and whose curing agent is a polyfunctional isocyanate is generally used.
- heat-resistant resins in which fluorine is added to the backbone of the main agent such as copolymers of tetrafluoroolefin and carboxylic acid vinyl ester, tetrafluoroolefin and alkyl vinyl ether copolymer, chlorotrifluoroolefin and carboxylic acid vinyl ester copolymer
- Two-component curable heat-resistant resins such as coalesced, chlorotrifluoroolefin and alkyl vinyl ether copolymers can be used.
- a copolymer of tetrafluoroolefin and carboxylic acid vinyl ester can be preferably used.
- a heat-resistant resin containing a fluorine component as a matrix component, the slipperiness of the surface of the mat coat layer (6) can be further improved and more excellent antifouling properties can be imparted.
- a urethane resin and / or an acrylic resin may be further added to the above-described fluorine-containing resin to further improve the strength and moldability.
- organic fine particles as well as inorganic fine particles can be used. It is also acceptable to mix them.
- the inorganic fine particles one or more of silica, alumina, calcium oxide, calcium carbonate, calcium sulfate, calcium silicate, carbon black and the like can be used, and among these, the use of silica is preferable.
- the organic fine particles fine particles such as acrylic ester compounds, polystyrene compounds, epoxy resins, polyamide compounds, or cross-linked products thereof can be used.
- These fine particles having an average particle size of 1 ⁇ m to 10 ⁇ m are preferably used, and 2 ⁇ m to 5 ⁇ m is particularly preferable.
- too small particles having a particle diameter of less than 1 ⁇ m are used, they are buried in the coating solution, and it is necessary to add a large amount of particles in order to achieve a desired gloss value.
- a particle having a large particle size exceeding is used, the coating thickness is exceeded and it tends to fall off.
- the content of the fine particles to be added is appropriately determined in the range of 0.1 to 60% by weight according to the degree of the surface gloss value required for the packaging material, the particle size and the type of the fine particles to be added. Whatever fine particles are used, if the content is less than 0.1% by weight, it is difficult to achieve a gloss value of 30% or less. As a result, the effect of improving moldability cannot be sufficiently obtained. On the other hand, when the content exceeds 60% by weight, there is a concern that the gloss value is lowered more than necessary and the appearance is impaired.
- a preferable range of the content of the fine particles is in the range of 5 to 55% by weight, and particularly preferably in the range of 20 to 50% by weight.
- the particle size and content thereof are in the above upper and lower limits, so that the gloss value can be easily controlled to 1 to 30%, particularly the optimal range of 2 to 10%. Good slipperiness can be imparted.
- outer adhesive layer Although it does not specifically limit as an adhesive agent which comprises the said adhesive bond layer (11), for example, the two-component curing type urethane type adhesive agent etc. which contain a polyol component and an isocyanate component are mentioned. This two-component curing type urethane-based adhesive is suitably used particularly when bonded by a dry laminating method. Although it does not specifically limit as said polyol component, For example, polyester polyol, polyether polyol, etc. are mentioned.
- the isocyanate component is not particularly limited, and examples thereof include diisocyanates such as TDI (tolylene diisocyanate), HDI (hexamethylene diisocyanate), and MDI (methylene bis (4,1-phenylene) diisocyanate).
- the thickness of the adhesive layer (11) is preferably set to 2 ⁇ m to 5 ⁇ m, and particularly preferably 3 ⁇ m to 4 ⁇ m.
- an inorganic or organic antiblocking agent or an amide slip agent may be added to the constituent resin as long as the effect of the present invention is not impaired.
- the metal foil forming the barrier layer (4) plays a role of imparting a gas barrier property for preventing the entry of oxygen and moisture into the molding packaging material (1).
- this metal foil For example, aluminum foil, copper foil, etc. are mentioned, Aluminum foil is generally used.
- the thickness of the metal foil is preferably 20 ⁇ m to 100 ⁇ m. When it is 20 ⁇ m or more, generation of pinholes during rolling when producing a metal foil can be prevented, and when it is 100 ⁇ m or less, stress during stretch forming or draw forming can be reduced and formability can be improved.
- the barrier layer (4) is subjected to chemical conversion treatment on at least the inner surface (4a), that is, the surface on the sealant layer (3) side.
- chemical conversion treatment By performing such chemical conversion treatment, corrosion of the surface of the metal foil due to the contents (battery electrolyte, food, medicine, etc.) can be sufficiently prevented.
- the metal foil is subjected to chemical conversion treatment by the following treatment.
- Aqueous solution comprising a mixture of phosphoric acid, chromic acid and fluoride metal salt
- Aqueous solution comprising a mixture of phosphoric acid, chromic acid, fluoride metal salt and non-metal salt
- Acrylic resin and / or phenolic resin Acrylic resin or / and phenolic resin and phosphate or phosphate compound, chromate or chromate compound and fluoride
- a chemical conversion film is formed by applying an aqueous solution composed of a mixture with a metal salt and then drying.
- the inner adhesive resin layer (5) for bonding the barrier layer (4) and the inner sealant layer (3) is particularly important for the selection of the material in order to prevent deterioration of the laminate strength due to the influence of the electrolyte and the like. is there.
- An adhesive resin having good adhesiveness must be used for both the metal foil (aluminum) of the barrier layer (4) and the interfacial resin of the inner sealant layer (3).
- Specific types of the resin are not particularly limited, and examples thereof include dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, and mesaconic acid, maleic anhydride, fumaric anhydride, itaconic anhydride, and mesaconic anhydride.
- Examples thereof include resins obtained by graft addition modification or copolymerization of polypropylene with a carboxyl group-containing monomer such as dicarboxylic anhydride such as acid, acrylic acid, methacrylic acid, crotonic acid, and itaconic acid.
- a resin obtained by graft addition modification with maleic anhydride, acrylic acid, or methacrylic acid, and maleic anhydride-modified polyolefin resin is particularly preferable.
- the method for producing such a resin is not particularly limited.
- the inner adhesive resin layer (5) is preferably a polyolefin resin having a carboxyl group in the chemical structure and a polyfunctional isocyanate, in order to increase the useful life of the packaging material by ensuring sufficient resistance to the electrolyte. It is comprised by the adhesive composition formed by containing a compound.
- This adhesive resin layer (5) is usually made of an adhesive solution containing a carboxyl group-containing polyolefin resin, a polyfunctional isocyanate compound, and an organic solvent, and the barrier layer (4) and / or the inner side. It is formed by applying to the sealant layer (3) and drying.
- the polyolefin resin having a carboxyl group (hereinafter sometimes referred to as “carboxyl group-containing polyolefin resin”) is not particularly limited.
- carboxyl group-containing polyolefin resin an ethylenically unsaturated carboxylic acid or an acid anhydride thereof is added to polyolefin.
- a modified polyolefin resin obtained by graft polymerization of olefin, a copolymer resin of an olefin monomer and an ethylenically unsaturated carboxylic acid, and the like is not particularly limited.
- an ethylenically unsaturated carboxylic acid or an acid anhydride thereof is added to polyolefin.
- a modified polyolefin resin obtained by graft polymerization of olefin, a copolymer resin of an olefin monomer and an ethylenically unsaturated carboxylic acid, and the like is not particularly limited
- the homopolymer of olefin monomers such as ethylene, propylene, and butene
- the copolymer of these olefin monomers, etc. are mentioned.
- the ethylenically unsaturated carboxylic acid is not particularly limited, and examples thereof include acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid, and itaconic acid. These ethylenically unsaturated carboxylic acids may be used alone or in combination of two or more. Further, as the carboxyl group-containing polyolefin resin, those that dissolve in an organic solvent are preferably used.
- carboxyl group-containing polyolefin resin a modified polyolefin resin obtained by graft polymerization of a homopolymer of propylene or a copolymer of propylene and ethylene with an ethylenically unsaturated carboxylic acid or an acid anhydride thereof is used. preferable.
- the polyfunctional isocyanate compound acts as a curing agent that reacts with the carboxyl group-containing polyolefin resin to cure the adhesive composition.
- the polyfunctional isocyanate compound is not particularly limited. For example, toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, or an isocyanurate-modified product, a burette-modified product of these diisocyanate compounds, or the diisocyanate compound. And a modified product obtained by adduct modification with a polyhydric alcohol such as trimethylolpropane.
- the polyfunctional isocyanate compound may be used alone or in combination of two or more.
- a polyfunctional isocyanate compound that dissolves in an organic solvent is preferably used.
- the organic solvent is not particularly limited as long as it can dissolve or disperse the carboxyl group-containing polyolefin resin.
- an organic solvent capable of dissolving the carboxyl group-containing polyolefin resin is preferably used.
- an organic solvent that can be easily removed by volatilizing the organic solvent from the adhesive liquid by heating or the like is preferably used.
- the organic solvent that can dissolve the carboxyl group-containing polyolefin resin and can be easily removed by volatilization by heating or the like is not particularly limited.
- aromatic organic solvents such as toluene and xylene are used.
- Examples include solvents, aliphatic organic solvents such as n-hexane, alicyclic organic solvents such as cyclohexane and methylcyclohexane (MCH), and ketone organic solvents such as methyl ethyl ketone (MEK). These organic solvents may be used alone or in combination of two or more.
- the equivalent ratio [NCO] / [OH] of the isocyanate group of the polyfunctional isocyanate compound to the hydroxyl group constituting the carboxyl group of the carboxyl group-containing polyolefin resin is 1.0 to 10 Is preferably set to .0. If it is set in such a range, it is possible to obtain an adhesive composition having excellent initial adhesive performance, and between the metal foil layer (4) and the inner sealant layer (3) by the battery electrolyte. The adhesive strength can be sufficiently suppressed over a longer period of time, and the electrolyte solution performance can be further improved.
- the equivalent ratio [NCO] / [OH] is more preferably set to 1.5 to 9.0, and particularly preferably set to 1.5 to 6.0.
- additives such as a reaction accelerator, a tackifier, and a plasticizer may be added as necessary.
- the thickness of the adhesive resin layer (5) is preferably set to 1 ⁇ m to 10 ⁇ m. When the thickness is 1 ⁇ m or more, sufficient adhesive force can be obtained, and when the thickness is 10 ⁇ m or less, the water vapor barrier property can be improved.
- the carboxyl group-containing polypropylene resin of the adhesive resin layer (5) may be a single composition or a mixture of two or more different melting points.
- Inner sealant layer Although it does not specifically limit as resin which comprises an inner side sealant layer (3), for example, 1) Random copolymer resin containing propylene and ethylene as a copolymerization component 2) As a copolymerization component, propylene, ethylene, and Examples include a copolymer resin containing butene, 3) a block copolymer resin containing propylene and ethylene as copolymerization components, and 4) a propylene homopolymer.
- the copolymer resins 1) to 3) may be blended with an olefin-based thermoplastic elastomer.
- the copolymer resin having a melting point of 130 ° C. to 160 ° C. is a resin having a peak temperature (melting point) of 130 ° C. to 160 ° C. measured by DSC (differential scanning calorimeter) at a temperature rising rate of 20 ° C./min. means.
- melting point is 130 ° C. or higher, sufficient heat resistance can be secured, and when the melting point is 160 ° C. or lower, excellent sealing properties can be secured.
- a copolymer resin containing at least propylene and ethylene as copolymerization components and having an MFR of 1 g / 10 min to 15 g / 10 min is used.
- the MFR melting flow rate
- the MFR is a value measured according to JIS K7210-1999 (Condition M).
- the thickness of the inner sealant layer (3) is preferably 10 to 80 ⁇ m. When the thickness is 10 ⁇ m or more, sufficient sealing strength can be obtained, and when the thickness is 80 ⁇ m or less, the water vapor barrier from the end face is sufficiently prevented from being damaged.
- the inner sealant layer (3) may be composed of a single layer as described above, or may be composed of a plurality of layers by performing a polypropylene co-extruded film or a polypropylene extrusion laminate twice. good.
- the adhesive resin layer (5) has excellent affinity for both the metal foil of the barrier layer (4) and the inner sealant layer (3).
- the interlayer laminate strength between the two layers can be sufficiently improved. Therefore, when the packaging material (1) is formed into, for example, a battery case, it is possible to prevent the interlayer laminate strength from being lowered due to the influence of the electrolyte, and heat generation due to repeated charge and discharge and expansion of the packaging material, It is also possible to prevent a decrease in interlayer laminate strength due to the shrinkage, and to ensure a sufficient sealing performance.
- a biaxially stretched polyamide film (2) as an outer base material layer (2) is bonded to one surface of a metal foil as a barrier layer (4) with an adhesive (11), for example, by a dry lamination method. Further, a mat coat layer (6) made of a two-component curable heat-resistant resin in which inorganic fine particles are dispersedly dispersed is applied and formed on the biaxially stretched polyamide film (2).
- a metal foil having a chemical conversion treatment applied to at least the inner surface (the surface on which the treatment liquid used in the next step is applied) (4a) is used. You may use the metal foil by which the chemical conversion process was performed on both surfaces.
- the other surface (inner surface) (4a) of the barrier layer (4) is provided with an adhesive resin layer (5) having good adhesion to both the metal foil and the interface side resin of the inner sealant layer.
- An inner sealant layer (3) is formed therethrough. In this way, a laminated body (30) is obtained (refer FIG. 1).
- inorganic and / or organic fine particles such as silica are dispersed on the outer surface of the outer base layer (2) of the laminate (30), for example, in a heat-resistant resin component in which fluorine is added to the skeleton of the main agent.
- the contained two-component curable resin solution is applied and dried to form a mat coat layer (6) in which the surface gloss value is controlled within the range of 1 to 30%.
- the means for applying the two-part curable resin liquid for forming the mat coat layer (6) is not particularly limited, and examples thereof include a gravure roll method.
- the packaging material for molding (1) of the present invention is formed into various shapes such as a rectangular parallelepiped shape having a deep molding height (overhang molding, deep drawing molding, etc.), so that a battery case, a packaging container for foods and pharmaceuticals, etc. Produced on the body.
- the battery case, food packaging material, and pharmaceutical packaging material obtained by such molding prevent the contents from entering between the metal foil barrier layer (4) and the inner adhesive resin layer (5). Therefore, for example, in the case of a battery case, it is possible to prevent the laminate strength from being lowered due to the influence of the electrolyte, and to be affected by the heat generated by repeated charge and discharge and the expansion and contraction of the packaging material.
- the laminate strength can be prevented from decreasing, and good sealing performance can be maintained over a long period of time.
- Example 1> Apply a chemical conversion treatment solution consisting of polyacrylic acid, trivalent chromium compound, water and alcohol on both sides of aluminum foil (4) (base material layer) with a thickness of 40 ⁇ m and dry at 180 ° C. Was subjected to chemical conversion treatment so as to be 10 mg / m 2 .
- a biaxially stretched 6 nylon film (2) (outer base material layer) having a thickness of 15 ⁇ m was dry-laminated with a two-component curable urethane adhesive (11) on one surface of the aluminum foil.
- a maleic acid-modified polypropylene resin (5) (inner adhesive layer) having adhesion to both the metal foil and polypropylene, a melting point of 140 ° C., and an MFR of 7 g / 10 min of ethylene-propylene random copolymer resin (3) was prepared by extrusion as a laminated film having a maleic acid-modified polypropylene resin layer of 7 ⁇ m and an ethylene-propylene random copolymer layer of 28 ⁇ m by the T-die method.
- this laminated film was superimposed on the chemical conversion treated surface of the aluminum foil (4), and passed through a hot roll heated to 150 ° C. to obtain a laminated body (30).
- a two-part curable resin composition composed of a copolymer of tetrafluoroolefin and vinyl carboxylate containing 50% by weight of silica having an average particle diameter of 3 ⁇ m is applied to the outer substrate layer surface with a gravure roll.
- a mat coat layer (6) was formed, and the molding packaging material (1) shown in FIG. 1 was obtained.
- composition, components, etc. of the mat coat layer (6), the inner adhesive resin layer (5) and the inner sealant layer (3) are as shown in Table 1.
- Fluorine-added two-component curable resin two-component curable resin composition comprising a copolymer of tetrafluoroolefin and carboxylic acid vinyl ester
- m-PP maleic anhydride-modified polypropylene (propylene and ethylene copolymer with maleene anhydride Modified polypropylene resin grafted with acid)
- M-PP Maleic anhydride-modified polypropylene (modified polypropylene resin obtained by graft polymerization of maleic anhydride to a copolymer of propylene and ethylene)
- Random PP Propylene-ethylene random copolymer resin
- Block PP Propylene-ethylene block copolymer resin
- Homo PP Polypropylene resin Polyfunctional isocyanate: Hexamethylene diisocyanate polymer (NCO content 23.1% by mass)
- Examples 2 to 7 Various molding packaging materials were obtained in the same manner as in Example 1 except that the component composition of the mat coat layer (6) was varied.
- Example 8> A biaxially stretched 6 nylon film (2) formed by an inflation method having a thickness of 15 ⁇ m on one surface of an aluminum foil (4) (barrier layer) subjected to double-side chemical conversion treatment in the same manner as in Example 1 Dry lamination was performed with a curable urethane adhesive (11).
- a maleic anhydride-modified polypropylene resin (5) (inner adhesive resin layer) and a propylene-ethylene random copolymer having a melting point of 130 ° C. and an MFR of 20 g / 10 min.
- the unitary resin was extruded from an extrusion die of an extruder and passed through an extruded resin layer (outer layer of the sealant layer) adjusted to a thickness of 20 ⁇ m, and a propylene-ethylene random copolymer film (3) (3) ( The innermost layer of the sealant layer) was laminated and integrated by a sandwich lamination method.
- Example 9 A biaxially stretched 6 nylon film (2) formed by an inflation method having a thickness of 15 ⁇ m on one surface of an aluminum foil (4) (barrier layer) subjected to double-side chemical conversion treatment in the same manner as in Example 1 Dry lamination was performed with a curable urethane adhesive (11).
- maleic acid-modified polypropylene modified polypropylene resin obtained by graft polymerization of maleic anhydride to a copolymer of propylene and ethylene, melting temperature: 77 ° C., acid value: 10 mgKOH on the other surface (4a) of the aluminum foil (4) / G
- a polymer of hexamethylene diisocyanate polyfunctional isocyanate compound, NCO content 23.1)
- an adhesive mixed with 0.9 g so that the equivalent ratio [NCO] / [OH] is 1.8 is applied and dried at 80 ° C.
- Example 10 For Example 9, except that the adhesive resin of Table-1 was used as the constituent material of the inner adhesive resin layer (5), and an unstretched homopolypropylene film having a thickness of 80 ⁇ m was used for the sealant layer (3). Obtained the molding packaging material (1) in the same manner as in Example 9.
- Example 11 Compared to Example 9, homopolypropylene and propylene-ethylene having the thickness of 80 ⁇ m shown in Table-1 for the sealant layer (3) using the adhesive resin of Table-1 as the constituent material of the inner adhesive resin layer (5) A molding packaging material (1) was obtained in the same manner as in Example 9, except that a two-layer unstretched film made of a random copolymer was used.
- the melting points described in the description of each of the above examples and comparative examples are the melting points measured at an increase rate of 20 ° C./min using an automatic differential scanning calorimeter (product number: DSC-60A) manufactured by Shimadzu Corporation. It is.
- ⁇ Formability evaluation method> Using an overhang molding machine (product number: TP-25C-X2) manufactured by Amada Co., Ltd., the packaging material for molding is stretched into a rectangular parallelepiped shape of 55 mm long ⁇ 35 mm wide ⁇ 8 mm deep, and based on the following criteria The moldability was evaluated. (Criteria) “ ⁇ ”... No pinholes and no cracks occurred “ ⁇ ”... Slightly some pinholes were generated but there were virtually no “ ⁇ ”... Pinholes and cracks were corners Occurred.
- ⁇ Lamination strength evaluation method Cut the molding packaging material to a width of 15 mm to prepare a measurement piece, and laminate strength of the measurement piece (lamination strength between the inner adhesive resin layer (5) and the inner sealant layer (3)) in an atmosphere at 80 ° C. Measured with a tensile tester.
- ⁇ A laminate strength of 5 N / 15 mm width or more
- O A laminate strength of 3 N / 15 mm width or more and less than 5 N / 15 mm width
- X Lamination strength is less than 3 N / 15 mm width.
- ⁇ Electrolytic solution resistance evaluation method Cut the molding packaging material to a width of 15 mm to prepare a measurement piece, and a concentration of 1 mol / L of lithium hexafluorophosphate with respect to a mixed solvent in which ethylene carbonate and diethylene carbonate are mixed at a volume ratio of 1: 1.
- the solution and the measurement piece so dissolved as described above are put in a wide-mouthed bottle made of ethylene tetrafluoride resin and stored in an oven at 85 ° C. for one week. Then, the measurement piece is taken out and the inner adhesive resin layer (5) and The laminate was peeled at the interface with the inner sealant layer (3), and the laminate strength (adhesive strength) between them was measured.
- ⁇ Electrolyte adhesion appearance evaluation> The packaging material for molding is cut into 10 cm ⁇ 10 cm, and the concentration of lithium hexafluorophosphate is 1 mol / L with respect to the mixed solvent in which ethylene carbonate and diethylene carbonate are mixed at a volume ratio of 1: 1. After 1 cc of the dissolved solution was dropped onto the outermost surface of the molding packaging material, the surface of the droplet-adhered portion was wound using a rubbing tool in which cotton was wrapped around a weight of 1 cm in diameter and 1 kg in weight. The appearance when rubbed 10 times with cotton was evaluated. (Appearance criteria) “ ⁇ ” Appearance did not change after 10 reciprocations “ ⁇ ” Appearance changed after 5 reciprocations “ ⁇ ” Appearance changed after 1 reciprocation
- ⁇ Seal performance evaluation method> Using a Tensilon RTA-100 manufactured by Orientec Co., Ltd. and a constant temperature bath TCF-III1-B manufactured by Baldwin Co., Ltd., a seal peeling test was performed under conditions of 25 ° C. and 80 ° C. to evaluate the sealing performance.
- the sealing conditions for each packaging material were 5 mm seal width, 0.3 MPa seal pressure, 1 second seal time, 160 ° C. and 180 ° C. double-sided heating.
- the molding packaging material according to the present invention is suitably used as a battery case for notebook computers, mobile phones, in-vehicle, stationary lithium ion polymer secondary batteries and the like. It is preferably used as a packaging material for pharmaceutical products.
Abstract
Description
前記外側基材層の外面に、無機および/または有機の固体微粒子が分散含有された耐熱性樹脂組成物からなるマットコート層が塗着形成され、
該マットコート層側の表面のグロス値が30%以下に設定されてなることを特徴とする成形用包装材。
前記金属箔層の少なくとも内側の面に化成処理が施され、この化成処理面に、バリア層の金属箔及び内側シーラント層の樹脂の双方に接着性を有する内側接着樹脂層が積層され、更にこの接着樹脂層を介して前記内側シーラント層が積層されると共に、
前記外側基材層が2軸延伸ポリアミド樹脂フィルムからなり、
更に該外側基材層の外面に、耐熱性樹脂成分中に無機および/または有機の固体微粒子が分散含有された樹脂組成物からなるマットコート層が塗着形成され、
該マットコート層側の表面のグロス値が30%以下に設定されてなることを特徴とする成形用包装材。
耐熱性樹脂からなる外側基材層(2)は、包装材としての強度、良好な成形性を担うものであり、特に限定されるものではないが、6ナイロン、66ナイロン、MXDナイロンなどのポリアミド樹脂、またはポリエステル樹脂が好適に用いられ、なかでも2軸延伸ポリアミド樹脂フィルム、特に6ナイロンが好ましく用いられる。前記耐熱樹脂フィルム層は単独層でも2種類以上のフィルムを積層して用いても良い。この外側基材層(2)の厚さは、12~50μm、好ましくは15~30μm程度に設定されるのが好ましい。上記好適下限値以上に設定することで包装材として十分な強度を確保できると共に、上記好適上限値以下に設定することで張り出し成形時や絞り成形時の応力を小さくできて成形性を向上できる。
マットコート層(6)は、本発明において成形性の向上、電解液等の付着による外観棄損の防止のための主たる役割を担うものであり、耐熱性樹脂成分中に無機および/または有機の固体微粒子が分散含有された樹脂組成物からなる処理液を塗布し、乾燥することによって形成されるものである。このマットコート層(6)の形成により、包装材(1)の外側表面のグロス値が30%以下、とくに好ましくは1~15%、更に好ましくは2~10%程度に制御される。
前記接着剤層(11)を構成する接着剤としては、特に限定されるものではないが、例えばポリオール成分及びイソシアネート成分を含有してなる二液硬化型のウレタン系接着剤等が挙げられる。この二液硬化型のウレタン系接着剤は、特にドライラミネート法で接着する際に好適に用いられる。前記ポリオール成分としては、特に限定されるものではないが、例えばポリエステルポリオール、ポリエーテルポリオール等が挙げられる。前記イソシアネート成分としては、特に限定されるものではないが、例えばTDI(トリレンジイソシアネート)、HDI(ヘキサメチレンジイソシアネート)、MDI(メチレンビス(4,1-フェニレン)ジイソシアネート)等のジイソシアネート類などが挙げられる。前記接着剤層(11)の厚さは、2μm~5μmに設定されるのが好ましく、なかでも3μm~4μmに設定されるのが特に好ましい。
バリア層(4)を形成する金属箔は、成形用包装材(1)に酸素や水分の侵入を阻止するガスバリア性を付与する役割を担うものである。この金属箔としては、特に限定されるものではないが、例えば、アルミニウム箔、銅箔等が挙げられ、アルミニウム箔が一般的に用いられる。前記金属箔の厚さは、20μm~100μmであるのが好ましい。20μm以上であることで金属箔を製造する際の圧延時のピンホール発生を防止できると共に、100μm以下であることで張り出し成形時や絞り成形時の応力を小さくできて成形性を向上できる。
1)リン酸、クロム酸及びフッ化物の金属塩の混合物からなる水溶液
2)リン酸、クロム酸、フッ化物金属塩及び非金属塩の混合物からなる水溶液
3)アクリル系樹脂又は/及びフェノール系樹脂と、リン酸と、クロム酸と、フッ化物金属塩との混合物からなる水溶液
4)アクリル系樹脂又は/及びフェノール系樹脂とリン酸塩またはリン酸化合物、クロム酸塩またはクロム酸化合物とフッ化物金属塩との混合物からなる水溶液
を塗工した後乾燥することにより化成皮膜を形成する。
バリア層(4)と内側シーラント層(3)とを接着する内側接着樹脂層(5)は、電解液等の影響によるラミネート強度の経時的劣化を防ぐ上で、その材料の選択は特に重要である。少なくともバリア層(4)の金属箔(アルミニウム)と、内側シーラント層(3)の界面樹脂との双方に対して、いずれにも良好な接着性を有する接着性樹脂を用いなければならない。その具体的な樹脂の種類は、特に限定されるものではないが、例えば、マレイン酸、フマル酸、イタコン酸、メサコン酸等のジカルボン酸、無水マレイン酸、無水フマル酸、無水イタコン酸、無水メサコン酸等のジカルボン酸無水物、アクリル酸、メタクリル酸、クロトン酸、イタコン酸等のカルボキシル基含有単量体などを、ポリプロピレンにグラフト付加変性または共重合された樹脂が挙げられる。これらの中でも、無水マレイン酸、アクリル酸、メタクリル酸でグラフト付加変性された樹脂を用いるのが好ましく、特に無水マレイン酸変性ポリオレフィン樹脂が好適である。かかる樹脂の製造方法としては、特に限定されるものではないが、例えば、ポリプロピレンを有機溶媒に溶解させ、これをラジカル発生剤の存在下に酸(無水マレイン酸など)と反応させる溶液法、ポリプロピレンを加熱溶融させ、これをラジカル発生剤の存在下に酸(無水マレイン酸など)と反応させる溶融法等を例示できる。
内側シーラント層(3)を構成する樹脂としては、特に限定されるものではないが、例えば
1)共重合成分としてプロピレンとエチレンを含有するランダム共重合体樹脂
2)共重合成分としてプロピレン、エチレン及びブテンを含有する共重合体樹脂
3)共重合成分としてプロピレンとエチレンを含有するブロック共重合体樹脂
4)プロピレン単独重合体
等が挙げられる。
次に、本発明の成形用包装材(1)を製造する方法の一例について図1、2を参照しつつ説明する。
厚さ40μmのアルミニウム箔(4)(基材層)の両面に、ポリアクリル酸、三価クロム化合物、水、アルコールからなる化成処理液を塗布し、180℃で乾燥を行って、クロム付着量が10mg/m2となるように化成処理した。
ニルエステルの共重合体からなる二液硬化型
の樹脂組成物
m-PP:無水マイレン酸変性ポリプロピレン(プロピレンとエチレン
の共重合体に無水マイレン酸をグラフト重合させた変性ポ
リプロピレン樹脂)
M-PP:無水マイレン酸変性ポリプロピレン(プロピレンとエチレン
の共重合体に無水マイレン酸をグラフト重合させた変性ポリ
プロピレン樹脂)
ランダムPP:プロピレン-エチレンランダム共重合体樹脂
ブロックPP:プロピレン-エチレンブロック共重合体樹脂
ホモPP:ポリプロピレン樹脂
多官能イソシアネート:ヘキサメチレンジイソシアネートのポリマー体
(NCO含量23.1質量%)
マットコート層(6)の成分組成を各種に変えた以外は、すべて前記実施例1と同様にして各種の成形用包装材を得た。
実施例1と同様に両面化成処理を施したアルミニウム箔(4)(バリア層)の一方の面に、厚さ15μmのインフレーション法によって製膜された2軸延伸6ナイロンフィルム(2)を二液硬化型のウレタン接着剤(11)でドライラミネートした。
実施例1と同様に両面化成処理を施したアルミニウム箔(4)(バリア層)の一方の面に、厚さ15μmのインフレーション法によって製膜された2軸延伸6ナイロンフィルム(2)を二液硬化型のウレタン接着剤(11)でドライラミネートした。
実施例9に対して、内側接着樹脂層(5)の構成材料に、表―1の接着樹脂を用い、かつシーラント層(3)に厚さ80μmの未延伸のホモポリプロピレンフィルムを用いたこと以外は、実施例9と同様にして成形用包装材(1)を得た。
実施例9に対して、内側接着樹脂層(5)の構成材料に、表―1の接着樹脂を用い、かつシーラント層(3)に表―1に示す厚さ80μmのホモポリプロピレンとプロピレン-エチレンランダム共重合体からなる2層の未延伸フィルムを用いたこと以外は、実施例9と同様にして成形用包装材(1)を得た。
マットコート層(6)を有しないこと以外は、すべて実施例1と同様にして成形用包装材を得た。
マットコート層(6)を有しないこと以外は、すべて実施例9の接着樹脂層および実施例10のシーラント層と同様にして成形用包装材を得た。
株式会社アマダ製の張り出し成形機(品番:TP-25C-X2)を用いて成形用包装材に対して縦55mm×横35mm×深さ8mmの直方体形状に張り出し成形を行い、下記判定基準に基づいて成形性を評価した。
(判定基準)
「◎」…ピンホールが全くなく、割れも全く発生しなかった
「△」…ピンホールがごく一部で僅かに発生したものの実質的に殆どなかった
「×」…ピンホールと割れがコーナー部に発生した。
成形用包装材を15mm幅にカットして測定片を作成し、80℃の雰囲気下で前記測定片のラミネート強度(内側接着樹脂層(5)と内側シーラント層(3)とのラミネート強度)を引張試験機で測定した。
(判定基準)
「◎」…5N/15mm幅以上のラミネート強度を有する
「○」…3N/15mm幅以上5N/15mm幅未満のラミネート強度を有する
「×」…ラミネート強度が3N/15mm幅未満である。
成形用包装材を15mm幅にカットして測定片を作成し、エチレンカーボネートとジエチレンカーボネートを1:1の容量比で混合した混合溶媒に対して六フッ化リンリチウム塩を1モル/Lの濃度となるように溶解せしめた溶液及び前記測定片を四フッ化エチレン樹脂製の広口ボトルに入れて85℃のオーブン中に1週間保存した後、測定片を取り出して内側接着樹脂層(5)と内側シーラント層(3)との界面で剥離して両者間のラミネート強度(接着強度)を測定した。
(判定基準)
「◎」…測定された接着強度が、初期接着強度に対して保持率90%以上
「○」…測定された接着強度が、初期接着強度に対して保持率60%以上90%未満
「△」…測定された接着強度が、初期接着強度に対して保持率30%以上60%未満
「×」…測定された接着強度が、初期接着強度に対して保持率30%未満(浸漬中に層間剥離したものを含む)。
成形用包装材を10cm×10cmにカットして、エチレンカーボネートとジエチレンカーボネートを1:1の容量比で混合した混合溶媒に対して六フッ化リンリチウム塩を1モル/Lの濃度となるように溶解せしめた溶液1ccを、成形用包装材の最外表面に滴下したのち、直径1cm、重さ1kgの分銅に綿を巻き付けた摺擦用具を用いて上記液滴付着部分の表面を巻きつけた綿で10往復擦ったときの外観を評価した。
(外観判定基準)
「◎」10往復させても外観に変化のなかったもの
「△」5往復目で外観に変化があったもの
「×」1往復目で外観に変化があったもの
株式会社オリエンテック製のテンシロンRTA-100及び株式会社ボールドウィン製の恒温槽TCF-III1-Bを用いて、25℃及び80℃の条件下でシール剥離試験を行いシール性能の評価を行った。シール条件は、各成形用包装材について、シール幅5mm、シール圧0.3MPa、シール時間1秒、シール温度160℃及び180℃両面加熱で行った。
(シール性能判定基準)
「◎」…160℃でシールし25℃でシール剥離試験を行った場合及び180℃でシールし80℃でシール剥離試験を行った場合のいずれにおいても30N/15mm以上の強度が得られたもの
「○」…160℃でシールし25℃でシール剥離試験を行った場合及び180℃でシールし80℃でシール剥離試験を行った場合のいずれにおいても25N/15mm以上30N/15mm未満の強度が得られたもの
「×」…上記に該当しなかったもの(シール性能が悪い)。
測定機器として、BYK社製、「micro-TRI-gloss-s」を用い、60°反射角で測定した。
2・・・外側基材層(耐熱性樹脂層)
3・・・内側シーラント層(熱可塑性樹脂)
4・・・バリア層(金属箔層)
5・・・内側接着樹脂層
6・・・マットコート層
11・・・接着剤層
23・・・熱ロール
Claims (17)
- 耐熱性樹脂からなる外側基材層と、熱可塑性樹脂からなる内側シーラント層と、それらの両層間に配設されたバリア層としての金属箔とを含む成形用包装材において、
前記外側基材層の外面に、無機および/または有機の固体微粒子が分散含有された耐熱性樹脂組成物からなるマットコート層が塗着形成され、
該マットコート層側の表面のグロス値が30%以下に設定されてなることを特徴とする成形用包装材。 - 耐熱性樹脂からなる外側基材層と、熱可塑性樹脂からなる内側シーラント層と、それらの両層間に配設されたバリア層としての金属箔とを含む成形用包装材において、
前記金属箔層の少なくとも内側の面に化成処理が施され、この化成処理面に、バリア層の金属箔及び内側シーラント層の樹脂の双方に接着性を有する内側接着樹脂層が積層され、更にこの接着樹脂層を介して前記内側シーラント層が積層されると共に、
前記外側基材層が2軸延伸ポリアミド樹脂フィルムからなり、
更に該外側基材層の外面に、耐熱性樹脂成分中に無機および/または有機の固体微粒子が分散含有された樹脂組成物からなるマットコート層が塗着形成され、
該マットコート層側の表面のグロス値が30%以下に設定されてなることを特徴とする成形用包装材。 - 前記グロス値が1%~15%である請求項1または2に記載の成形用包装材。
- 前記マットコート層の耐熱性樹脂組成物は、主剤の骨格中にフッ素が付加された耐熱性樹脂を主成分として含む請求項1~3のいずれか1項に記載の成形用包装材。
- 前記マットコート層の耐熱性樹脂組成物は、テトラフルオロオレフィンとカルボン酸ビニルエステルの共重合体からなる二液硬化型の耐熱性樹脂を主成分として含む請求項4に記載の成形用包装材。
- 前記マットコート層の耐熱性樹脂組成物は、更にウレタン樹脂及び/またはアクリル樹脂を含む請求項5に記載の成形用包装材。
- 前記マットコート層の耐熱性樹脂組成物は、耐熱性樹脂成分中に、平均粒径1μm~10μmの無機および/または有機の固体微粒子が0.1~60重量%分散含有されたものである請求項1~6のいずれか1項に記載の成形用包装材。
- 前記内側シーラント層は、プロピレン単独重合体または共重合成分として少なくともプロピレンとエチレンを含有する共重合体からなる請求項1~7のいずれか1項に記載の成形用包装材。
- 前記内側シーラント層は、融点が130℃~160℃、MFRが1~25g/10minの前記重合体または共重合体である請求項8に記載の成形用包装材。
- 前記内側接着樹脂層は、カルボキシル基を有するポリオレフィン樹脂と多官能イソシアネート化合物とを含有する接着剤からなる請求項2~9のいずれか1項に記載の成形用包装材。
- 前記ポリオレフィン樹脂のカルボキシル基を構成するヒドロキシル基に対する前記多官能イソシアネート化合物のイソシアネート基の当量比[NCO]/[OH]が1.0~10.0である請求項10に記載の成形用包装材。
- 前記カルボキシル基を有するポリオレフィン樹脂は、130℃で測定されるメルトフローレート(MFR)が5~40g/10minである請求項10または11に記載の成形用包装材。
- 請求項1~12のいずれか1項に記載の成形用包装材を深絞り成形または張出し成形してなる電池用ケース。
- 食品または医薬品の包装材として用いられる請求項1~12のいずれか1項に記載の成形用包装材。
- バリア層用の金属箔の少なくとも一方の面に化成処理を施す工程と、該金属箔の他方の面に2軸延伸ポリアミドフィルムを外側接着剤で接着して外側基材層を形成する工程と、該外側基材層の表面に、テトラフルオロオレフィンとカルボン酸ビニルエステルの共重合体からなる二液硬化型の耐熱性樹脂に、平均粒径が1μm~10μmの無機および/または有機の固体微粒子が0.1重量%~60重量%分散含有された樹脂組成物を塗布乾燥して、グロス値が1~30%となるようにコントロールされたマットコート層を形成する工程と、前記金属箔の一方の化成処理面に、前記バリア層の金属箔と後記内側シーラント層の樹脂の双方に接着性を有する内側接着樹脂層を形成する工程と、該内側接着樹脂層上に熱可塑性樹脂からなるシーラント層を積層形成する工程と、上記によって得られた積層体を130℃~220℃に熱せられた熱ロールで前記外側基材層が熱ロール側となるようにして熱処理する工程とを含むことを特徴とする成形用包装材の製造方法。
- 前記シーラント層の熱可塑性樹脂として、プロピレンの単独重合体または共重合成分として少なくともプロピレンとエチレンを含有する共重合体樹脂からなり、融点が130℃~160℃、MFRが1~25g/10minである樹脂を用いる請求項15に記載の成形用包装材の製造方法。
- 前記内側接着樹脂層は、カルボキシル基を有するポリオレフィン樹脂と多官能イソシアネート化合物とを含有し、ポリオレフィン樹脂のカルボキシル基を構成するヒドロキシル基に対する前記多官能イソシアネート化合物のイソシアネート基の当量比[NCO]/[OH]が1.0~10.0である接着樹脂を塗布し乾燥することによって形成する請求項15または16に記載の成形用包装材の製造方法。
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Also Published As
Publication number | Publication date |
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KR20200130869A (ko) | 2020-11-20 |
CN108198965A (zh) | 2018-06-22 |
US9553283B1 (en) | 2017-01-24 |
US20170012250A1 (en) | 2017-01-12 |
KR20230035456A (ko) | 2023-03-13 |
JP2013226838A (ja) | 2013-11-07 |
CN103442887A (zh) | 2013-12-11 |
US20140087241A1 (en) | 2014-03-27 |
KR20190047132A (ko) | 2019-05-07 |
KR20210147111A (ko) | 2021-12-06 |
JP5385484B2 (ja) | 2014-01-08 |
CN202782011U (zh) | 2013-03-13 |
US9515299B2 (en) | 2016-12-06 |
JP6077394B2 (ja) | 2017-02-08 |
KR20140007932A (ko) | 2014-01-20 |
JPWO2012133663A1 (ja) | 2014-07-28 |
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