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. 05, 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 64/00 (2006.01); C08G 64/30 (2006.01); C07C 68/06 (2020.01); C08L 69/00 (2006.01);
U.S. Cl.
CPC ...
C08G 64/305 (2013.01); C07C 68/06 (2013.01); C08G 64/307 (2013.01); C08L 69/00 (2013.01); C08G 2105/00 (2013.01);
Abstract
A process for producing polycarbonate comprising: a) contacting a dialkyl carbonate with a dihydroxy compound in an oligomerization zone in the presence of an oligomerization catalyst under oligomerization conditions to form a first intermediate; and b) contacting the first intermediate with a diaryl carbonate in a polymerization zone in the presence of a polymerization catalyst under polymerization conditions to produce the polycarbonate wherein the molar ratio of dihydroxy compound to dialkyl carbonate in the oligomerization zone is at least 2:1.