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. 28, 1984
Filed:
Mar. 31, 1983
Applicant:
Inventors:
Gernot Horlbeck, Haltern, DE;
Horst Heuer, Haltern, DE;
Assignee:
Chemische Werke Huels Aktiengesellschaft, Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
525437 ; 528272 ; 528286 ; 528287 ; 5283085 ; 528480 ; 528483 ; 528487 ; 528490 ;
Abstract
A process for the post condensation of poly(alkylene terephthalate) in the solid phase is carried out in the presence of esters of phosphorous acid at 25.degree.-65.degree. C. below the melting point of the poly(alkylene terephthalate) while passing an inert gas stream through the reaction mixture.