Patent ID: 6365248
Filing Date: 2002-04-02
Classification: B32B,Y10T

Abstract:
A tearable laminated barrier film comprising:a tearable barrier film having first, second and third layers, an orientation ratio of not less than 2.8 in both machine and transverse directions during orientation and a shrinkage factor of 15 to 40% in pressurized water at a temperature of 120Â° C. for twenty minutes by heat stabilization at a heat treatment temperature of from 120 to 195Â° C.; and at least one base film laminated on the tearable barrier film, wherein each of the first and third layers of the tearable barrier film consists of 60 to 85 wt. % of nylon 6, 15 to 40 wt. % of metaxylylene adipamide and 0.1 to 10 wt. % of a modifier and the second layer of the tearable barrier film consists of 0 to 40 wt. % of thermoplastic resin, 60 to 95 wt. % of metaxylylene adipamide and 0.1 to 10 wt. % of the modifier, the modifier being at least one member selected from the group consisting of a polyamide elastomer and a modified ethylene-vinyl acetate copolymer, the modified ethylene-vinyl acetate copolymer being an acid-denatured body of a partial saponification of an ethylene-vinyl acetate copolymer having 20 to 50 wt. % of vinyl acetate.