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:
Feb. 22, 1983
Filed:
May. 29, 1981
Applicant:
Inventors:
Kazushige Kudo, Joyo, JP;
Yoshihiro Arai, Joyo, JP;
Ryoichi Tsurutani, Uji, JP;
Shun-ichi Kiriyama, Uji, JP;
Assignee:
Unitika Limited, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
525439 ; 524125 ; 524139 ; 528176 ; 528272 ; 528275 ; 528286 ;
Abstract
This invention is a method of manufacturing heat-stable polyesters, characterized in that phosphonic acid compounds are added, when heat-stable polyesters with decreased terminal carboxyl groups are manufactured by reacting polyesters and cyclic carbonate compounds in the presence of an alkali halide compound catalyst.