The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1989
Filed:
Jul. 06, 1988
Applicant:
Inventors:
Assignee:
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ; B32B / ; C08G / ; C08G / ;
U.S. Cl.
CPC ...
264235 ; 26421112 ; 2642358 ; 264237 ; 2642888 ; 2642902 ; 428419 ; 528388 ;
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.