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:
Aug. 03, 1976
Filed:
Aug. 05, 1974
Applicant:
Inventors:
Assignee:
Teijin Limited, Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
260 / ; 260 / ; 260 49 ; 260860 ;
Abstract
In a process of preparing aromatic polyesters from (A) aromatic dicarboxylic acids and (B) diphenols by the solid phase polymerization method, the speed of the solid phase polymerization reaction can be enhanced to a marked degree by copolymerizing (C) an aliphatic dihydroxy compound, and in this case the amounts in which the components (B) and (C) are used, based on (A), being 70 - 105 mol % of (B) and 1 - 50 mol % of (C), with the total amount of (B) and (C) corresponding to 100 - 130 mol % of (A).