Patent ID: 8114939
Filing Date: 2012-02-14
Classification: C08G,C08L

Abstract:
1. A process for deactivating metal-containing catalyst residues in a PLA resin, comprising contacting PLA resin containing residues of a metal-containing catalyst with a deactivating agent that includes (1) a polymer or copolymer having pendant acid groups and pendant ester groups wherein the polymer or copolymer contains from 3 to 50 mole percent of repeating units that contain pendant ethyl ester groups, or from 2 to 25 mole percent of repeating units that contain pendant ester groups with more than 2 carbon atoms in the ester portion, (2) a polymer or copolymer having at least one acid group per 250 atomic mass units and which has pendant lactic acid or poly(lactic acid) groups, or (3) a mixture of (1) and (2).