| abstract |
(57) [Summary] [Problem] A tertiary amine is copolymerized with a lactic acid-based polyester to promote crosslinking with a polyfunctional isocyanate to give a urethane-based polymer having a high degree of curing and excellent physical properties. Is obtained. A lactic acid residue containing more than 80 mol%, in lactic acid-based polyester tertiary amine in the main chain 5~100eq / 10 6 g is copolymerized, the molar ratio of L-lactic acid and D-lactic acid ( L / D) 1 to 9, reduced viscosity ηsp / c = 0.2 to 1.0 dl / g, Tg 35 to 60 A biodegradable copolymerized polyester characterized by a temperature of ℃. |