Process for forming film of hydrolyzed ethylene-vinyl acetate copolymer
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United States of America Patent
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Oct 1, 1991
Grant Date -
N/A
app pub date -
Feb 23, 1990
filing date -
Feb 27, 1989
priority date (Note) -
Expired
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Abstract
A process for forming a film of a hydrolyzed ethylene-vinyl acetate copolymer which comprises: coating a solution comprising a hydrolyzed ethylene-vinyl acetate copolymer to a substrate, drying the wet film and subjecting the dried film to heat-treatment, said obtained film being formed so as to have a ratio of absorbance at 1140 cm.sup.-1 to absorbance at 1090 cm.sup.-1 in infrared absorption spectrum of not less than 0.65. According to the process of the present invention, the hydrolyzed ethylene-vinyl acetate copolymer film having excellent oxygen impermeability can be obtained.
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