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:
Oct. 20, 1987
Filed:
Dec. 15, 1986
Applicant:
Inventors:
Thomas L Evans, Clifton Park, NY (US);
Carol B Berman, Schenectady, NY (US);
Assignee:
General Electric Company, Schenectady, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528371 ; 525462 ; 528196 ; 528370 ;
Abstract
Cyclic polycarbonate oligomers are polymerized to linear polycarbonates by contact with a catalyst comprising a polymer containing alkali metal phenoxide moieties. Said polymer is preferably a polycarbonate and the alkali metal is preferably lithium. The catalyst polymer may be prepared by the reaction of a polymer with phenolic moieties with an alkali metal base such as lithium phenoxide at a temperature in the range of about 200.degree.-300.degree. C.