Back to results
US 11,230,625 B2Granted
End-group isomerization of poly(alkylene carbonate) polymers
AssigneeSaudi Aramco Technologies Company
InventorsJames Eagan, Christopher A. Simoneau, Jay J. Farmer
Life of this patent
Estimating the term…
Abstract
Described herein are methods of preparing poly(alkylene carbonate) polymers comprising an increased ratio of primary hydroxyl end groups to secondary hydroxyl end groups, and compositions thereof.
Claims22
A method for increasing the ratio of primary to secondary OH end groups of a poly(propylene carbonate) (“PPC”) polymer composition, the method comprising steps of
- copolymerizing propylene oxide and CO2 in the presence of a copolymerization catalyst to form a reaction mixture comprising unquenched copolymerization catalyst and a starting PPC polymer composition,
- heating the reaction mixture comprising unquenched copolymerization catalyst and the starting PPC polymer composition to provide a reaction mixture comprising the unquenched copolymerization catalyst and a modified PPC polymer composition, wherein the modified PPC polymer composition has a higher ratio of primary to secondary OH end groups relative to the starting PPC polymer composition;
- and
- contacting the reaction mixture comprising unquenched copolymerization catalyst and the modified PPC polymer composition with a quenching agent suitable to end the copolymerization reaction.
1 more element
Dependencies are inferred from the claim text.