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:
Dec. 17, 2002
Filed:
Aug. 30, 2001
Andre Volkers, Wouw, NL;
Marcel Puyn, Swolgen, NL;
General Elecrric Company, Schenectady, NY (US);
Abstract
A process for quenching a catalyst used in the manufacture of polycarbonate by melt polycondensation of a dihydroxy compound and a diester. The process includes adding a sulfonic acid ester quencher to the polycarbonate and extruding the polycarbonate, wherein the amount of sulfonic acid ester added to the polycarbonate is effective to reduce the amount of branching species generated during extrusion of the polycarbonate to less than 100 parts per million. The catalyst used in the melt polycondensation reaction is selected from the group consisting of sodium dihydrogen phosphite, cesium dihydrogen phosphate and disodium magnesium ethylenediaminetetraacetic acid.