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:
Jun. 08, 2004
Filed:
Mar. 28, 2002
Hans-Peter Brack, Herrliberg, CH;
Dennis Karlik, Bergen op Zoom, NL;
Theodorus Lambertus Hoeks, Bergen op Zoom, NL;
John Morgan Whitney, Niskayuna, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method for preparing a polycarbonate comprises preparing a free hydroxyl-containing polycarbonate and reacting the hydroxyl-containing polycarbonate with a mixture of (B) a symmetrical optionally activated aromatic carbonic acid diester and (C) an optionally substituted aromatic hihydroxy compound, diol or diacid. A copolymerization reagent comprises a mixture of (B) a symmetrical optionally activated aromatic carbonic acid diester and (C) an optionally substituted aromatic hihydroxy compound, diol or diacid. A copolymer comprises [polycarbonate] moieties; (B) [symmetrical optionally activated aromatic carbonic acid diester] moieties and (C) [optionally substituted aromatic hihydroxy compound, diol or diacid] moieties, wherein x, y and z are mole percents of the copolymer.