Patent ID: 9012675
Filing Date: 2015-04-21
Classification: C08G

Abstract:
1. A method comprising: initiating an aliphatic polycarbonate polymerization reaction by combining an epoxide with carbon dioxide in the presence of a catalytic transition metal-ligand complex to form a reaction mixture comprising a polycarbonate chain, wherein the catalytic transition metal-ligand complex comprises at least one ligand that is a polymerization initiator and at least one ligand that is not a polymerization initiator; and quenching the polymerization reaction by contacting the reaction mixture with an acid containing an anion that is not a polymerization initiator, wherein less than 10 equivalents of the acid containing an anion that is not a polymerization initiator are added to the reaction mixture relative to the amount of catalytic transition metal-ligand complex present in the reaction mixture.