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. 21, 1989
Filed:
Jul. 31, 1987
Applicant:
Inventors:
Martin Bartmann, Recklinghausen, DE;
Wilfried Ribbing, Dorsten, DE;
Assignee:
Huls Aktiengesellschaft, Marl, DE;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528491 ; 524315 ; 524611 ; 528486 ;
Abstract
A process for improving the color quality of PPE or molding compounds containing PPE, comprising adding an .alpha.,.beta.-unsaturated ester of the formula: ##STR1## to the organic PPE solution prior to heating it to temperatures above 150.degree. C. R.sub.a and R.sub.b are independently H, CH.sub.3, COOR.sub.c, or Ph, and R.sub.c is a C.sub.1-10 alkyl group.