Patent ID: 8058470
Filing Date: 2011-11-15
Classification: C08G

Abstract:
1. A polyurethane obtained by reacting a polyester polyol with polyisocyanate, wherein the polyester polyol is obtained, using at least one fat and oil selected from the group consisting of a castor oil, a polycastor oil, and a hydroxylated soybean oil as an initiator, by either one of steps: (a) performing ring-opening polymerization of 750 parts by weight or less of DL-lactide with respect to 100 parts by weight of the initiator or 50 mol or less of L- or D-lactide with respect to 1 mol of the initiator; or (b) performing dehydration-condensation polymerization of 940 parts by weight or less of DL-lactic acid with respect to 100 parts by weight of the initiator or 100 mol or less of L- or D-lactic acid with respect to 1 mol of the initiator.