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:
Nov. 02, 1999
Filed:
Sep. 02, 1997
Patrick Joseph McCloskey, Watervliet, NY (US);
Gary Charles Davis, Albany, NY (US);
David Michel Dardaris, Ballston Spa, NY (US);
Daniel Joseph Brunelle, Burnt Hills, NY (US);
Robert Russell Gallucci, Mt. Vernon, IN (US);
Mahari Tjahjadi, Evansville, IN (US);
David Whalen, Mt. Vernon, IN (US);
Kevin Mitchell Snow, Mt. Vernon, IN (US);
General Electric Company, Schenectady, NY (US);
Abstract
High flow brominated polycarbonates, useful as flame retardant additives for other polymers such as polyesters, are obtained by equilibration of a brominated aromatic polycarbonate such as a tetrabromobisphenol A homo- or copolycarbonate with a di- or polyhydroxy aromatic compound such as bisphenol A, or a diaryl carbonate, and an equilibration catalyst, under conditions such that the weight average molecular weight of the brominated polycarbonate is reduced by at least 35%. Preferred equilibration catalysts are Group I metal carboxylates, such as sodium stearate, and hexaalkylguanidinium salts.