Patent ID: 6699418
Filing Date: 2004-03-02
Classification: B29L,B32B,C08J,Y10S,Y10T

Abstract:
A method for producing a biaxially stretched film, comprising:stretching a film having a moisture content of 1 to 30 wt %, and comprising mainly an ethylene-vinyl alcohol copolymer having an ethylene content of 15 to 70 mol % and a saponification degree of 80 mol % or more under heating, to obtain a stretched film; cooling the stretched film, to obtain a cooled stretched film; and subjecting the cooled stretched film to a heat treatment, thereby obtaining said biaxially stretched film; wherein a heating temperature during the stretching is 60 to 160Â° C., a cooling temperature is a temperature 30 to 100Â° C. lower than the heating temperature during the stretching, and a temperature for the heat treatment is 150 to 190Â° C.