LACTIC ACID-BASED COPOLYESTER

摘要

PROBLEM TO BE SOLVED: To obtain a lactic acid-based copolyester characterized by capable of giving a urethane-based polymer having a high hardness and excellent in physical properties by copolymerizing a lactic acid-based polyester with a tertiary amine for accelerating cross-linking with a polyfunctional isocyanate. SOLUTION: This biodegradable copolyester is characterized by having 1-9 molar ratio of L-lactic acid to D-lactic acid (L/D),ηsp/c=0.2-1.0 dl/g reduced viscosity and 35-60 deg.C Tg in the lactic acid-based polyester containing >=80 mole % lactic acid residue and copolymerized with 5-100 mg/106 g tertiary amine in its main chain.