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A laminated film exhibiting excellent interlayer adhesiveness obtained by extrusion-laminating a resin directly on a polyester film without effecting anchor-coating or without treating the molten film of the extrusion-laminated resin with ozone. The laminated film is obtained by extrusion-laminating

A laminated film exhibiting excellent interlayer adhesiveness obtained by extrusion-laminating a resin directly on a polyester film without effecting anchor-coating or without treating the molten film of the extrusion-laminated resin with ozone. The laminated film is obtained by extrusion-laminating, onto the polyester film, an ethylene copolymer containing an unsaturated carboxylic acid and a (meth)acrylic acid ester, which may be further blended with a small amount of an ethylene/α-olefin copolymer having a density of 840 to 900 kg/m 3 , the amount of the unsaturated carboxylic acid component being from 1 to 12% by weight and the amount of the (meth)acrylic acid ester component being from 2 to 25% by weight.

대표청구항 ▼

1. A method of producing a laminated film by extrusion-laminating comprising the step of:extrusion-laminating on the surface of a polyester film of which the surface is oxidized and has a surface wet tension of not smaller than 45 dyns/cm,(1) an extrusion-lamination resin comprising an ethylene/unsa

1. A method of producing a laminated film by extrusion-laminating comprising the step of:extrusion-laminating on the surface of a polyester film of which the surface is oxidized and has a surface wet tension of not smaller than 45 dyns/cm,(1) an extrusion-lamination resin comprising an ethylene/unsaturated carboxylic acid/(meth)acrylic acid ester copolymer or a mixture resin composition thereof with an ethylene/unsaturated carboxylic acid copolymer and/or an ethylene/(meth)acrylic acid ester copolymer, the amount of the unsaturated carboxylic acid component being from 1 to 12% by weight and the amount of the (meth)acrylic acid ester component being from 2 to 25% by weight with respect to the total amount of said extrusion-laminated resin components, or (2) an extrusion-lamination resin comprising a mixture resin composed of:(a) 100 parts by weight of the mixture resin component of an ethylene/unsaturated carboxylic acid/(meth)acrylic acid ester copolymer or the mixture resin composition of said ethylene/unsaturated carboxylic acid/(meth)acrylic acid ester copolymer with an ethylene/unsaturated carboxylic acid copolymer and/or an ethylene/(meth)acrylic acid ester copolymer, the amount of the unsaturated carboxylic acid component being from 1 to 12% by weight and the amount of the (meth)acrylic acid ester component being from 2 to 25% by weight with respect to the total amount of the extrusion-laminated resin components, and(b) not more than 30 parts by weight of an ethylene/α-olefin copolymer resin having a density of 840 to 900 kg/m 3 , at a resin temperature of from 280 to 340° C. 2. A method of producing a laminated film according to claim 1, wherein said extrusion-lamination resin is extrusion sandwich-laminated between said polyester film and another polar base member. 3. A method of producing a laminated film by extrusion-laminating, comprising the step of:extrusion-laminating on the surface of a polyester film, an ethylene/unsaturated carboxylic acid/(meth)acrylic acid ester copolymer or a mixture resin composition thereof with an ethylene/unsaturated carboxylic acid copolymer and/or an ethylene/(meth)acrylic acid ester copolymer, the amount of the unsaturated carboxylic acid component being from 1 to 12% by weight and the amount of the (meth)acrylic acid ester component being from 2 to 25% by weight with respect to the total amount of said extrusion-laminated resin components, at a resin temperature of from 280 to 340° C. 4. The method of claim 3, wherein the carboxylic acid group in said copolymer or said mixture resin composition is partly ionized with an alkali metal ion or an alkaline earth metal ion within a range in which the ionization degree is not larger than 20%. 5. The method of claim 3, wherein another polar base member is laminated on the polyester film via the extrusion-laminated resin. 6. The method of claim 5, wherein the polar base member is selected from the group consisting of an aluminum foil, an aluminum-deposited polyester film, an aluminum-deposited polypropylene film, a silica-deposited polyester film, alumina-deposited polyester film, a polyamide film, an ethylene/vinyl alcohol copolymer film and a paper. 7. The method of claim 3, wherein the carboxylic acid group in said copolymer or said mixture resin composition is partly ionized with a zinc ion within a range in which the ionization degree is not larger than 20%. 8. A method of producing a laminated film by extrusion-laminating onto at least one surface of a polyester film, a mixture resin comprising:(a) 100 parts by weight of the mixture resin component of an ethylene/unsaturated carboxylic acid/(meth)acrylic acid ester copolymer, or the mixture resin composition of said ethylene/unsaturated carboxylic acid/(meth)acrylic acid ester copolymer with an ethylene/unsaturated carboxylic acid copolymer and/or an ethylene/(meth)acrylic acid ester copolymer, the amount of the unsaturated carboxylic acid component being from 1 to 12 % by weight and the amount of the (meth)acrylic acid ester component being from 2 to 25% by weight with respect to the total amount of the extrusion-laminated resin components; and(b) not more than 30 (excluding 0) parts by weight of an ethylene/α-olefin copolymer resin having a density of from 840 to 900 kg/m 3 , at a resin temperature of from 280 to 340° C. 9. The method of claim 8, wherein the carboxylic acid group in said mixture resin composition is partly ionized with an alkali metal ion or an alkaline earth metal ion within a range in which the ionization degree is not larger than 20%. 10. The method of claim 8, wherein another polar base member is laminated on the polyester film via the extrusion-laminated resin. 11. The method of claim 10, wherein the polar base member is selected from the group consisting of an aluminum foil, an aluminum-deposited polyester film, an aluminum-deposited polypropylene film, a silica-deposited polyester film, alumina-deposited polyester film, a polyamide film, an ethylene/vinyl alcohol copolymer film and a paper.