Classifications

• • 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
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/197—Sealing members characterised by the material having a layered structure
• • 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
  • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
  • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber 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
• • 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
• • 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
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin 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
• • 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
  • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
• • 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
• • 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
• • 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
  • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
  • H01M50/105—Pouches or flexible bags
• • 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
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
• • 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
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
• • 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
  • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
  • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
  • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
  • H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
• • 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
  • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
  • H01M50/136—Flexibility or foldability
• • 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
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/193—Organic material
• • 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
• • 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
  • B32B2250/24—All layers being polymeric
  • B32B2250/242—All polymers belonging to those covered by group B32B27/32
• • 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
  • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
  • B32B2264/10—Inorganic particles
  • B32B2264/102—Oxide or hydroxide
  • B32B2264/1021—Silica
• • 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
  • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
  • B32B2264/20—Particles characterised by shape
  • B32B2264/202—Solid spheres
• • 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
  • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
  • B32B2264/30—Particles characterised by physical dimension
  • B32B2264/303—Average diameter greater than 1µm
• • 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
  • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
• • 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
• • 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
  • B32B2307/40—Properties of the layers or laminate having particular optical properties
  • B32B2307/414—Translucent
• • 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
  • B32B2307/54—Yield strength; Tensile strength
• • 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
  • B32B2307/702—Amorphous
• • 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
  • B32B2307/732—Dimensional properties
  • B32B2307/737—Dimensions, e.g. volume or area
  • B32B2307/7375—Linear, e.g. length, distance or width
  • B32B2307/7376—Thickness
• • 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
  • B32B2307/746—Slipping, anti-blocking, low friction
• • 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
  • B32B2307/748—Releasability
• • 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
  • B32B2311/00—Metals, their alloys or their compounds
  • B32B2311/24—Aluminium
• • 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
  • B32B2439/40—Closed containers
  • B32B2439/46—Bags
• • 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
• • 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 polypropylene-based multilayer film, and more particularly, to a polypropylene-based multilayer film for a cell pouch.
• a secondary battery generally refers to a lithium secondary battery, and is a battery used in portable terminal devices such as notebook computers, smartphones, tablet PCs, and video cameras, electric vehicles including hybrid vehicles, and smart grids for energy storage. At the same time, research to overcome various environmental factors such as a harsh thermal environment and mechanical shock is being conducted while reducing the thickness.
• a secondary battery pouch is used.
• Commonly used pouch films for secondary batteries sequentially have heat-adhesive properties such as polyethylene (PE), non-stretched polypropylene (cPP), polypropylene (PP), etc.
• An inner resin layer composed of an adhesive layer made of polyolefin or a copolymer thereof, a base material to maintain mechanical strength, and an aluminum layer that is a metal foil layer that serves as a barrier layer for moisture and oxygen, polyethylene to protect the battery cell from external impact It has a multilayer structure in which a functional polymer film such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), nylon or liquid crystal polymer (LCP) forms an outer resin layer. Consists of.
• PET polyethylene terephthalate
• PEN polyethylene naphthalate
• LCP liquid crystal polymer
• a packaging material formed by press-working metal, particularly aluminum, into a cylindrical or parallelepiped shape, etc. has been mainly used.
• a metal can packaging material there is a limitation in that the outer wall of the container is hard and the shape of the battery itself must be determined by the shape of the metal can packaging material.
• Korean Patent Laid-Open No. 2003-0029141 discloses a cell pouch comprising a base layer, an adhesive layer, a barrier layer, a dry lamination layer and a sealant layer, and the sealant layer is composed of a low-fluidity polypropylene layer and a high-fluidity polypropylene layer,
• Korean Patent Application Laid-Open No. 2003-0029141 discloses a cell pouch comprising a base layer, an adhesive layer, a barrier layer, a dry lamination layer and a sealant layer, and the sealant layer is composed of a low-fluidity polypropylene layer and a high-fluidity polypropylene layer.
• 2002-0030737 discloses a cell pouch laminated using biaxially stretched nylon, polyethylene terephthalate (PET) and polyolefin resin on a base film and a surface protective layer, and a fluorine-based substrate film as a secondary processing, A technology for coating a silicone-based or acrylic-based resin is disclosed.
• the pouch-type secondary battery can have flexibility in shape and has the advantage of being able to implement a secondary battery of the same capacity with a smaller volume and mass.
• the pouch type since the pouch type uses a soft pouch as a container, it may be damaged for various reasons in various processes. For example, in the process of accommodating the electrode assembly in the pouch, protruding parts such as electrode tabs or electrode leads cause damage such as cracks to the PP and cPP layers inside the pouch, and the aluminum layer is exposed by such damage. In this case, a side reaction will occur due to the reactivity with the electrolyte.
• the aluminum layer exposed to the electrolyte may be corroded by causing a chemical reaction with oxygen or moisture with the electrolyte that has penetrated or diffused into the battery.
• a chemical reaction with oxygen or moisture with the electrolyte that has penetrated or diffused into the battery There are problems that arise. Specifically, lithium hexafluorophosphate (LiPF 6 ) may react with water and oxygen to generate hydrofluoric acid (HF), a corrosive gas.
• HF hydrofluoric acid
• Such hydrofluoric acid may react with aluminum to cause a rapid exothermic reaction, and as a secondary reaction, it is adsorbed to the aluminum surface and penetrates into the tissue. Lithium may react with the atmosphere and cause ignition.
• Republic of Korea Patent Registration No. 1499740 is a polymer film for cell packaging material comprising 1 to 30 wt% of low-density polyethylene (LDPE), 50 to 98 wt% of polypropylene (PP) and 1 to 20 wt% of a crosslinking resin, to lower the electrolyte penetration rate.
• LDPE low-density polyethylene
• PP polypropylene
• crosslinked resin is used to increase compatibility between LDPE and PP. It does not specifically mention.
• Republic of Korea Patent No. 1485523 discloses an aluminum pouch film for secondary batteries comprising an outer resin layer made of polyethylene terephthalate, nylon, etc., a first adhesive layer, an aluminum layer, a second adhesive layer, and an inner resin layer made of polyolefin, and However, only the composition of the entire layer of the pouch is described, and the specific composition of the polyolefin constituting the inner resin layer is not mentioned.
• Korean Patent Application Laid-Open No. 2019-0047104 discloses a propylene polymer having a propylene-based random copolymer obtained by random copolymerizing propylene with ethylene or butene as a main component, and a propylene polymer having a comonomer (ethylene or butene) content of 0 to 1.5 wt% 60 to 90
• a polypropylene-based composite film comprising a layer B composed of 10 to 40% by weight of a propylene polymer having 10 to 40% by weight and a comonomer (ethylene or butene) content and a C layer composed of a propylene-based ethylene or butene random copolymer
• the B layer contains 100 to 2000 ppm of fatty acid amide-based lubricant and 0 to 20 wt % of metallocene catalyst-based low-density polyethylene, but the remaining raw materials other than the B layer raw material are not specifically mentioned. have.
• the present invention is mainly used as a sealant layer of a cell pouch to provide a specific laminate composition as a multilayer film that has excellent adhesion performance and simultaneously satisfies moldability in post processing.
• Another object of the present invention is to provide a cell pouch using the multilayer film as a sealant layer.
• the present invention provides a skin layer comprising (a) a propylene-based binary copolymer, (f) a modified polyolefin, and (e) an anti-blocking agent; (b1) a core layer comprising an ethylene propylene block copolymer and (c) an amorphous propylene rubber; and (a) a propylene-based binary copolymer, (b2) an ethylene-propylene block copolymer, (d) a slip agent, and (e) a seal layer comprising an anti-blocking agent.
• the (a) propylene-based binary copolymer contains ethylene in an amount of 2.0 to 6.5% by weight
• the (b1) ethylene-propylene block copolymer contains ethylene in an amount of 2.0 to 6.0% by weight
• the ethylene-propylene block copolymer contains ethylene in an amount of 6.0 to 10.0 wt%
• the (c) amorphous propylene rubber contains ethylene or butene in an amount of 10 to 60 wt%
• the slip agent is an amide-based slip agent.
• the anti-blocking agent is spherical silica
• the (f) modified polyolefin provides a polypropylene-based multilayer film, characterized in that maleic anhydride is grafted in an amount of 1 to 10 wt%.
• the (a) propylene-based binary copolymer has a melt index (MI, 230° C., 2.16 kg load) of 2 to 12 g/10 min
• the (b1) ethylene-propylene block copolymer has a melt index (MI, 230° C.
• the (b2) ethylene propylene block copolymer has a melt index (MI, 2.16 kg load) of 1 to 5 g/10 min
• the amorphous propylene rubber is Melt index (MI, load of 2.16 kg at 230°C) is 1 to 5 g/10min
• the (d) slip agent is a mixture of two or more of the amide slip agents having 14 to 22 carbon atoms
• the (e) anti-blocking agent The agent is assumed to have an average particle diameter of 1.5 to 3.0 ⁇ m, a water content of less than 0.5 wt %, and a polypropylene-based multilayer film, characterized in that the bulk density of the particles is 0.8 to 1.0 g/cm 3 to provide.
• the skin layer comprises (a) 80 to 99 parts by weight of the propylene-based binary copolymer, (f) 1 to 20 parts by weight of the modified polyolefin, and (e) 0.1 to 1 parts by weight of the anti-blocking agent,
• the core layer contains (b1) 50 to 90 parts by weight of the ethylene propylene block copolymer and (c) 10 to 50 parts by weight of the amorphous propylene rubber, and the seal layer contains (a) 20 to 90 parts by weight of the propylene-based binary copolymer.
• the multilayer film has a coefficient of friction (ASTM D1894, 40 ⁇ m thickness, based on the seal layer surface) of 0.5 or less, an aluminum peel strength measured according to the following method of 8 N/15 mm or more, and a thermal adhesive strength measured according to the following method It provides a polypropylene-based multilayer film, characterized in that 60 N / 15mm or more.
• the multilayer film (40 ⁇ m thick), aluminum foil (50 ⁇ m thick, laminated on the skin layer of the multilayer film), and nylon (15 ⁇ m thick, laminated on the aluminum foil) were laminated at 130° C. and 50° C.
• the laminated film cured for 14 days was cut to 15 mm wide and the peel strength was measured at a peel angle of 180° at a peel rate of 50 mm/min at 23°C.
• a sample prepared by thermal bonding for 1 second under a pressure of 2 kgf/cm 2 so that the multilayer film of the laminated film faces is cut to a width of 15 mm, and at a peeling angle of 180° at a peeling rate of 100 mm/min at 23° C.
• the peel strength of the was measured through a tensile strength measuring device.
• the sealant layer formed of the film in order to solve the another problem, the sealant layer formed of the film; a barrier layer formed on the sealant layer; and an external resin layer formed on the barrier layer.
• a polypropylene-based multilayer film including a skin layer, a core layer and a seal layer of a specific composition, used as a sealant layer for a cell pouch, has excellent adhesion performance and excellent mechanical properties while simultaneously satisfying moldability in post-processing;
• a specific lamination composition of the polypropylene-based multilayer film to have surface properties and transparency may be presented.
• the present inventors have faced the fact that the specific composition of a film material that is used as a sealant layer of a conventional cell pouch and that simultaneously satisfies the required adhesive performance and moldability in post-processing is unknown, and As a result of repeated research, when used as a sealant layer of a cell pouch in a specific composition of the skin layer, core layer and seal layer centered on the propylene-based binary copolymer, the adhesive performance is excellent, and the formability in post-processing is excellent while simultaneously satisfying the formability and excellent mechanical properties. It was discovered that it can have physical properties, surface properties and transparency, and led to the present invention.
• the present invention provides a skin layer comprising (a) a propylene-based binary copolymer, (f) a modified polyolefin, and (e) an anti-blocking agent; (b1) a core layer comprising an ethylene propylene block copolymer and (c) an amorphous propylene rubber; and (a) a propylene-based binary copolymer, (b2) an ethylene-propylene block copolymer, (d) a slip agent, and (e) a seal layer comprising an anti-blocking agent.
• the propylene-based binary copolymer is a copolymer of propylene and one type of ⁇ -olefin other than propylene as main components of the skin layer and the seal layer of the multilayer film, and preferably propylene and ethylene are injected simultaneously It may be a binary copolymer to be polymerized.
• the polymerization method of the copolymer is by a conventional method known in the art, and is not particularly limited in the present invention.
• the (a) propylene-based binary copolymer can contribute to the improvement of aluminum peel strength in that it can contain the same propylene as the olefin-based adhesive component as a component, and the (a) propylene-based binary copolymer is an amorphous propylene-ethylene copolymer.
• a crystalline copolymer that is not a coalescence it is preferable to contain ethylene in an amount of 2 to 6.5% by weight, more preferably, it may contain ethylene in an amount of 2.5 to 3.5% by weight, and the melting point (Tm) is 125 to 155 It is preferable that it is °C, and it is more preferable that it is 140 to 154°C.
• the (a) propylene-based binary copolymer may have a melt index (MI, 2.16 kg load) of 2 to 10 g/10min, preferably 2 to 8 g/10min, more preferably may be 5 to 8 g/10 min. If the melt index is less than 2 g/10min, productivity may decrease, and if it exceeds 12 g/10min, the effect of improving aluminum peel strength may be insignificant.
• MI melt index
• the (b1) ethylene-propylene block copolymer is the main component of the core layer of the multilayer film, and the (a) propylene-based binary copolymer and the constituent materials are the same as propylene and ethylene, so delamination occurs due to the affinity of the two phases. I never do that.
• the polymerization method of the (b1) ethylene-propylene block copolymer is by a conventional method known in the art, and is not particularly limited in the present invention.
• the (b1) ethylene-propylene block copolymer may contain ethylene in an amount of 2 to 6% by weight, and more preferably, include ethylene in an amount of 4 to 6% by weight. If the ethylene content of the (b1) ethylene-propylene block copolymer is less than 2% by weight, the impact resistance improvement effect may be insignificant, and if it exceeds 6% by weight, a large amount of fish eyes may occur due to microdispersion.
• the (b1) ethylene propylene block copolymer may have a melt index (MI, load of 2.16 kg at 230°C) of 1 to 5 g/10min, preferably 2 to 5 g/10min. If the melt index is less than 1 g/10 min, a large amount of fish eyes may occur due to microdispersion, and if it exceeds 5 g/10 min, the impact resistance improvement effect may be insignificant.
• MI melt index
• the (b2) ethylene-propylene block copolymer is the main component of the seal layer of the multilayer film, and the (a) propylene-based binary copolymer and the constituent materials are the same as propylene and ethylene. It is excellent and the quality uniformity is increased.
• the polymerization method of the (b2) ethylene-propylene block copolymer is by a conventional method known in the art, and is not particularly limited in the present invention.
• the (b2) ethylene-propylene block copolymer may contain ethylene in an amount of 6 to 10% by weight, and more preferably, include ethylene in an amount of 6 to 8% by weight. If the ethylene content of the (b2) ethylene-propylene block copolymer is less than 6% by weight, sufficient thermal bonding strength cannot be expressed during thermal bonding, and when it exceeds 10% by weight, the thermal bonding strength is low due to thermal bonding between the thermal bonding layers during thermal bonding. There is a downside.
• the (b2) ethylene propylene block copolymer melt index (MI, 230°C, 2.16 kg load) may be 1 to 5 g/10min, preferably 2 to 5 g/10min. If the melt index is less than 1 g/10 min, fish eyes due to microdispersion may occur in large quantities, and if it exceeds 5 g/10 min, the impact resistance improvement effect may be insignificant.
• the amorphous propylene rubber is a subcomponent of the core of the multilayer film, and is a copolymer of propylene and one type of ⁇ -olefin other than propylene, preferably propylene and ethylene or butene are injected simultaneously, and ethylene
• butene and butene are included in an amount of 10 to 60% by weight, more preferably, ethylene may include 10 to 30% by weight or butene in an amount of 20 to 40% by weight.
• the effect of improving impact resistance may be insignificant, and if it exceeds 60% by weight, a large amount of low molecular weight is included and the surface may become sticky during film forming, and the surface may become uneven, and the tensile strength may be lowered.
• the polymerization method of the copolymer is by a conventional method known in the art, and is not particularly limited in the present invention.
• the (d) slip agent and (e) anti-blocking agent are sub-components of the seal layer of the multilayer film. It serves to improve formability and workability by lowering the friction coefficient in post-processing processes such as deep drawing by giving It plays a role in improving moldability and workability by alleviating the (sticky, blocking) phenomenon.
• the (d) slip agent is preferably an amide-based organic compound synthesized from fatty acids, which has a high melting point, and has a neutral structure in which a hydroxyl group is substituted with an amino structure.
• the (d) slip agent is a mixture of two or more of the amide slip agents having 14 to 22 carbon atoms, and more preferably, tetradecanamide, which is a saturated and unsaturated amide-based organic compound having 14 to 22 carbon atoms, Hexadecanamide (Hexadecanamide), octadecanamide (Octadecanamide) and 13-cis-docosenamide (13-cis-docosenamide) is a mixture.
• the (e) anti-blocking agent is preferably a silica anti-blocking agent having a spherical particle shape and a uniform particle distribution, and also has a moisture content of less than 0.5 wt % when dried (at 105 ° C. for 60 min condition), and the average It is preferable that the particle diameter is 1.5 to 3.0 ⁇ m, preferably 2-3 ⁇ m, and the bulk density of the particles is 0.8 to 1.0 g/cm 3 .
• the (f) modified polyolefin is a subcomponent of the skin layer of the multilayer film, and is a modified polypropylene that contains 1 to 10% by weight, preferably 3 to 5% by weight of maleic anhydride, a polar functional group.
• the content of maleic anhydride of the modified polypropylene is less than 1% by weight, the adhesion to the aluminum foil may be reduced, and when it exceeds 10% by weight, a fish eye occurs due to a large amount of polar functional groups and a small molecule is generated, After corona surface treatment, the surface tension may be lowered, and the adhesion to the aluminum foil may be reduced.
• the components (a) to (f) above constitute the main components or sub-components of the skin layer, the core layer, and the seal layer, and to be included in a specific content ratio to realize the desired adhesion performance and moldability in post-processing when used as a sealant layer of a cell pouch.
• the skin layer contains (a) 80 to 99 parts by weight of the propylene-based binary copolymer, (f) 1 to 20 parts by weight of the modified polyolefin, and (e) 0.1 to 1 parts by weight of the anti-blocking agent.
• the core layer comprises (b1) 50 to 90 parts by weight of an ethylene propylene block copolymer and (c) 10 to 50 parts by weight of an amorphous propylene rubber, and the seal layer contains (a) 20 parts by weight of a propylene-based binary copolymer.
• the skin layer contains (a) 87 to 93 parts by weight of the propylene-based binary copolymer, (f) 7 to 13 parts by weight of the modified polyolefin, and (e) 0.1 to 0.9 parts by weight of the anti-blocking agent.
• the core layer comprises (b1) 65 to 85 parts by weight of the ethylene propylene block copolymer and (c) 15 to 35 parts by weight of the amorphous propylene rubber
• the seal layer is (a) a propylene-based binary copolymer 25 to 55 parts by weight and (b2) 45 to 75 parts by weight of the ethylene propylene block copolymer, (d) 0.1 to 0.4 parts by weight of the slip agent, and (e) 0.1 to 0.3 parts by weight of the anti-blocking agent.
• each layer constituting the polypropylene-based multilayer film according to the present invention does not impair the purpose of the present invention
• various additives such as antioxidants, catalyst neutralizers, pigments, dispersants, weathering agents, if necessary , an antistatic agent, a UV stabilizer, talc, and the like may be additionally contained.
• the amount of each of these additives can be adjusted in consideration of the total production amount and the manufacturing process, etc. within a range known to be usable for manufacturing the polypropylene-based multilayer film according to the present invention without affecting the properties.
• the multilayer film using the above components may be prepared according to a conventional method known in the art.
• the components constituting each layer are put into a Henschel mixer in the required amount, mixed, and then prepared in pellet form at 180 to 240° C. using an extruder, and melt-molded through a multi-layer film forming machine to form a film Thereby, a multilayer film can be manufactured.
• the polypropylene-based multilayer film according to the present invention can have excellent mechanical properties, surface properties and transparency while simultaneously satisfying moldability in post-processing and excellent adhesion performance when used as a sealant layer of a cell pouch.
• the polypropylene-based multilayer film according to the present invention has a tensile strength (ASTM D638) of 140 MPa or more, preferably 142 MPa or more, and a surface treatment strength (ASTM D2578-09, based on the skin layer surface) of 40 dyne or more, preferably 42 dyne or more, coefficient of friction (ASTM D1894, 40 ⁇ m thickness, seal layer surface basis) 0.5 or less, preferably 0.3 or less, Haze (40 ⁇ m thickness basis) 20% or less, preferably 18% or less, below
• the aluminum peel strength measured according to the method may be 8 N/15 mm or more, preferably 10 N/15 mm or more, and the thermal adhesive strength measured according to the following method may be 60 N/15 mm or more, preferably
• the multilayer film (40 ⁇ m thick), aluminum foil (50 ⁇ m thick, laminated on the skin layer of the multilayer film), and nylon (15 ⁇ m thick, laminated on the aluminum foil) were laminated at 130° C. and 50° C.
• the laminated film cured for 14 days was cut to 15 mm wide and the peel strength was measured at a peel angle of 180° at a peel rate of 50 mm/min at 23°C.
• a sample prepared by thermal bonding for 1 second under a pressure of 2 kgf/cm 2 so that the multilayer film of the laminated film faces is cut to a width of 15 mm, and at a peeling angle of 180° at a peeling rate of 100 mm/min at 23° C.
• the peel strength of the was measured through a tensile strength measuring device.
• the polypropylene-based multilayer film according to the present invention may be mainly applied to cell pouch molding, but is not limited thereto, and may be applied to molding, for example, packaging film, retort pouch, electronic material pouch, and the like.
• a propylene-based binary copolymer was prepared so that propylene and ethylene were injected into the reactor for bulk polymerization, and the ethylene content in the copolymer was 3 wt%.
• Propylene was injected into the reactor for polymerization, and then propylene and ethylene were injected into the gas phase reactor for bulk polymerization to prepare a propylene-based block copolymer such that the ethylene content in the block copolymer was 5.5 wt%.
• Propylene was injected into the reactor for polymerization, and then propylene and ethylene were injected into the gas phase reactor for bulk polymerization to prepare a propylene-based block copolymer such that the ethylene content in the block copolymer was 6 wt%.
• composition ratio of Table 1 below (unit: parts by weight, usually added phenol-based antioxidant, phosphate-based antioxidant, and hydrotalcite as a catalyst neutralizer) was melt-mixed at 220° C. through a single screw extruder to form pellets.
• a propylene-based copolymer mixed resin composition was prepared for each layer. Thereafter, the prepared mixed resin composition for each layer was melt-molded through a multilayer film molding machine at 220° C. to form a film, and a multilayer film having a thickness of 40 ⁇ m (skin layer: core layer: seal layer thickness ratio 1:3:1) was formed.
• skin layer: core layer: seal layer thickness ratio 1:3:1 seal layer thickness ratio
• Specimens were prepared using the prepared pellets and films, and physical properties were measured or evaluated according to the following method, and the results are shown in Table 1 below.
• FT-IR infrared absorption spectrum
• a film thickness of 40 ⁇ m was measured according to ASTM D1894 method.
• a film thickness of 40 ⁇ m was measured according to ASTM D1003 method.
• the multilayer film (40 ⁇ m thick), aluminum foil (50 ⁇ m thick, laminated on the skin layer of the multilayer film), and nylon (15 ⁇ m thick, laminated on the aluminum foil) were laminated at 130° C. and 50° C.
• the laminated film cured for 14 days was cut to a width of 15 mm, and the peel strength was measured at a peel angle of 180° at a peel rate of 50 mm/min at 23°C.
• a sample prepared by thermal bonding for 1 second under a pressure of 2 kgf/cm 2 so that the multilayer film of the laminated film faces is cut to a width of 15 mm, and at a peeling angle of 180° at a peeling rate of 100 mm/min at 23° C.
• the peel strength of the was measured through a tensile strength measuring instrument.
• composition (Examples 1, 3 and 4) is more preferable than composition (Example 2) by (f) mixing a relatively large amount of the modified polyolefin, (f) instead of the modified polyolefin (a) It can be seen that the replacement with a propylene-based binary copolymer (Comparative Example 1) is more preferable.
• the multilayer film used as the sealant layer of the cell pouch there exists a specific lamination composition that satisfies all of excellent mechanical properties, surface properties and transparency along with adhesion performance and moldability in post-processing. It is confirmed that the polypropylene-based multilayer film including the skin layer, the core layer and the seal layer according to the present invention can sufficiently satisfy this.

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