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:
May. 19, 2020
Filed:
Dec. 20, 2016
Applicant:
Shell Oil Company, Houston, TX (US);
Inventors:
Garo Garbis Vaporciyan, Houston, TX (US);
Kunquan Yu, Katy, TX (US);
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 64/04 (2006.01); C08G 64/30 (2006.01);
U.S. Cl.
CPC ...
C08G 64/307 (2013.01); C08G 64/04 (2013.01);
Abstract
A process for producing polycarbonate comprising contacting a dihydroxy capped carbonate and a diaryl carbonate in a reaction zone in the presence of a polymerization catalyst under polymerization conditions to produce polycarbonate. The dihydroxy capped carbonate is a carbonate with a dihydroxy compound on each end, and it is formed by the reaction of a dihydroxy compound with a dialkyl carbonate. The dihydroxy compound is a dihydroxy aromatic compound.