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:
Jul. 28, 1998
Filed:
Aug. 02, 1996
Applicant:
Inventors:
Kurt-Peter Meurer, Leverkusen, DE;
Tony Van Osselaer, Belsele, BE;
Werner Verhoeven, Heide-Kalmthout, BE;
Johan Vaes, Kalmthout, BE;
Ignace Hooftman, Kruibeke, BE;
Willy Van Herck, Brasschaat, BE;
Claus Wulff, Krefeld, DE;
Jurgen Hinz, Krefeld, DE;
Alfred Eitel, Dormagen, DE;
Kaspar Hallenberger, Leverkusen, DE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C07C / ;
U.S. Cl.
CPC ...
203 71 ; 203 14 ; 203 73 ; 203 80 ; 568724 ;
Abstract
A process for preparing bisphenol A which has a purity of at least 99.95 wt. % of p,p-bisphenol A (BPA). Thermally stable and colour-stable BPA purified in accordance with the invention produces improved thermal and colour stability and improved optical transparency in polymers such as e.g. polycarbonates prepared therefrom.