Process for producing biaxially stretched polyparaphenylene sulfide film
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United States of America Patent
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Jun 13, 1989
Issued Date -
N/A
app pub date -
Jul 6, 1988
filing date -
Apr 14, 1986
priority date (Note) -
Expired
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Abstract
Disclosed herein is a process for producing biaxially stretched polyparaphenylene sulfide film including the steps of melt-molding a polyparaphenylene sulfide resin into a sheet-form or film-form, rapidly chilling the thus molded sheet or film thereby obtaining an amorphous and non-stretched sheet or film, subjecting the amorphous and non-stretched sheet or film to thermal treatment for from 0.5 to 20 sec at a temperature of from 150.degree. to 300.degree. C., cooling the thus treated film or sheet to room temperature and subjecting the thus cooled film or sheet to biaxial stretching at a temperature of from 80.degree. to 120.degree. C.
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