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:
Mar. 27, 1984
Filed:
Apr. 16, 1982
Applicant:
Inventors:
Henry K Hall, Jr, Tucson, AZ (US);
Anne B Padias, Tucson, AZ (US);
Assignee:
Celanese Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528272 ; 528274 ; 528275 ;
Abstract
In the two stage reaction of terephthalic acid with 1,4-butanediol to produce polybutylene terephthalate in which acid and diol are first subjected to catalytic esterification/oligomerization and the resulting products are thereafter subjected to catalytic polycondensation, the co-production of tetrahydrofuran is significantly reduced by conducting the polycondensation reaction prior to completion of the esterification/oligomerization reaction.