Films, sheets, laminates and molded articles having gas barrier properties
First Claim
1. A film or sheet obtained by heat-molding a resin composition having excellent drawability which comprises (A) a saponified ethylene-vinyl ester copolymer having an ethylene content of 20 to 55 mole% and a saponification degree of at least 95%, (B) a saponified ethylene-vinyl ester copolymer having an ethylene content of 25 to 60 mole% and a saponification degree of at least 90%, the ethylene content of the saponified copolymer (B) being higher by at least 3 mole% than the ethylene content of the saponified copolymer (A), and (C) a polyamide having a film-forming molecular weight, wherein the weight ratio of the saponified copolymer (A) to the saponified copolymer (B) is in the range of from 90/10 to 10/90 and the weight ratio of the sum of the saponified copolymers (A) and (B) to the polyamide (C) is in the range of from 95/5 to 5/95, into a film or sheet.
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Accused Products
Abstract
Disclosed is a resin composition excellent in its drawability, which comprises (A) a saponified ethylene-vinyl ester copolymer having an ethylene content of 20 to 55 mole % and a saponification degree of at least 95%, (B) a saponified ethylene-vinyl ester copolymer having an ethylene content of 25 to 60 mole % and a saponification degree of at least 90%, the ethylene content of the saponified copolymer (B) being higher by at least 3 mole % than the ethylene content of the saponified copolymer (A), and (C) a polyamide, wherein the weight ratio of the saponified copolymer (A) to the saponified copolymer (B) is in the range of from 90/10 to 10/90 and the weight ratio of the sum of the saponified copolymers (A) and (B) to the polyamide (C) is in the range of from 95/5 to 5/95. The resin compositions have excellent gas barrier properties and can be molded into films or sheets or laminated with other film-forming materials. Molded articles such as cups and other vessels having gas barrier properties can be obtained by molding the laminated films prepared from the resin compositions.
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Citations
18 Claims
- 1. A film or sheet obtained by heat-molding a resin composition having excellent drawability which comprises (A) a saponified ethylene-vinyl ester copolymer having an ethylene content of 20 to 55 mole% and a saponification degree of at least 95%, (B) a saponified ethylene-vinyl ester copolymer having an ethylene content of 25 to 60 mole% and a saponification degree of at least 90%, the ethylene content of the saponified copolymer (B) being higher by at least 3 mole% than the ethylene content of the saponified copolymer (A), and (C) a polyamide having a film-forming molecular weight, wherein the weight ratio of the saponified copolymer (A) to the saponified copolymer (B) is in the range of from 90/10 to 10/90 and the weight ratio of the sum of the saponified copolymers (A) and (B) to the polyamide (C) is in the range of from 95/5 to 5/95, into a film or sheet.
- 10. A laminated film comprising as one layer thereof a resin composition comprising (A) a saponified ethylene-vinyl ester copolymer having an ethylene content of 20 to 55 mole% and a saponification degree of at least 95%, (B) a saponified ethylene-vinyl ester copolymer having an ethylene content of 25 to 60 mole% and a saponification degree of at least 90%, the ethylene content of the saponified copolymer (B) being higher by at least 3 mole% than the ethylene content of the saponified copolymer (A), and (C) a polyamide having a film-forming molecular weight, wherein the weight ratio of the saponified copolymer (A) to the saponified copolymer (B) is in the range of from 90/10 to 10/90 and the weight ratio of the sum of the saponified copolymers (A) and (B) to the polyamide (C) is in the range of from 95/5 to 5/95, and a second layer of a material prepared from a polymer selected from the group consisting of polyethylene, polypropylene, ethylene-vinyl propylene copolymers, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, ion-crosslinked olefin copolymers, polyethylene terephthalate, polycarbonates, polystyrene, polyvinyl chloride, polyvinylidene chloride, methacrylic resins, and poly-4-methylpentene-1.
- 11. A laminated film which comprises an intermediate layer of a resin composition comprising (A) a saponified ethylene-vinyl ester copolymer having an ethylene content of 20 to 55 mole% and a saponification degree of at least 95%, (B) a saponified ethylene-vinyl ester copolymer having an ethylene content of 25 to 60 mole% and a saponification degree of at least 90%, the ethylene content of the saponified copolymer (B) being higher by at least 3 mole%, than the ethylene content of the saponified copolymer (A), and (C) a polyamide having a film-forming molecular weight, wherein the weight ratio of the saponified copolymer (A) to the saponified copolymer (B) is in the range of from 90/10 to 10/90 and the weight ratio of the sum of the saponified copolymers (A) and (B) to the polyamide (C) is in the range of from 95/5 to 5/95, and inner and outer layers on either side of said intermediate layer formed of a humidity-resistant resin selected from the group consisting of low density polyethylene, medium density polyethylene, high density polyethylene, isotactic polypropylene, crystalline ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, ion-crosslinked olefin copolymers, polyethylene terephthalate, polycarbonates, polystyrene, polyvinyl chloride, polyvinylidene chloride, methacrylic resins and poly-4-methylpentene-1.
Specification