Patent ID: 7622547
Filing Date: 2009-11-24
Classification: C08G

Abstract:
1. A process for producing a ring-opening polymerization product selected from the group consisting of a polylactone, a polylactone aliphatic alkyl ester and a polylactone aliphatic carboxylic acid ester, by ring-opening polymerization that proceeds through ring opening of at least one lactone compound (a) as a monomer, the process comprising the step of carrying out a reaction of the lactone compound (a) using an activated carbon as a catalyst and using an active hydrogen-containing compound (b) as an initiator, the active hydrogen-containing compound (b) selected from the group consisting of water, diols, ether diols, trifunctional or higher polyhydroxy compounds, monohydroxy compounds, and monocarboxy or polycarboxy compounds.