Method for producing biaxially stretched film made of ethylene-vinyl alcohol copolymer
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United States of America Patent
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Mar 2, 2004
Grant Date -
Oct 31, 2002
app pub date -
Feb 14, 2002
filing date -
Feb 23, 2001
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Abstract
A method for producing a biaxially stretched film is provided, in which the method comprises, stretching a film made mainly of 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; cooling the film; and subjecting the cooled film to a heat treatment; wherein a heating temperature during the stretching is 60 to 160.degree. C., a cooling temperature is a temperature 30 to 100.degree. C. lower than the heating temperature during the stretching, and a temperature for the heat treatment is 150 to 190.degree. C. The thus obtained biaxially stretched film of the present invention has a small bowing coefficient.
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