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:
Jan. 31, 2023
Filed:
Nov. 09, 2017
Applicant:
Dow Global Technologies Ilc, Midland, MI (US);
Inventors:
Nima Nikbin, Lake Jackson, TX (US);
David A. Babb, Lake Jackson, TX (US);
Assignee:
Dow Global Technologies LLC, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 64/34 (2006.01); C08G 64/02 (2006.01); C08G 65/26 (2006.01); C08L 69/00 (2006.01); B01J 27/26 (2006.01); B01J 31/18 (2006.01); C08G 64/20 (2006.01); C08G 18/44 (2006.01);
U.S. Cl.
CPC ...
C08G 64/34 (2013.01); B01J 27/26 (2013.01); B01J 31/1805 (2013.01); C08G 18/44 (2013.01); C08G 64/0208 (2013.01); C08G 64/205 (2013.01); C08G 65/2603 (2013.01); C08G 65/2663 (2013.01); C08L 69/00 (2013.01); B01J 2531/0238 (2013.01);
Abstract
Polycarbonate polyols are made by copolymerizing carbon dioxide and an alkylene oxide in the presence of a starter compound and a carbonate catalyst. The process is operated in semi-batch mode by combining starter, catalyst and a small amount of alkylene oxide in a reaction vessel, pressurizing the vessel with carbon dioxide, initiating polymerization, and then feeding both carbon dioxide and alkylene oxide to the vessel under polymerization conditions without removal of product until the feeds are completed.