| 摘要 |
A polyester containing one or more free COOH groups and having a carboxyl to hydroxyl ratio greater than one, wherein the polyester contains a member selected from the group consisting of L-lactic acid, D-lactic acid, DL-lactic acid, malic acid, citric acid, å-caprolactone, ñ-dioxanone, å-caproic acid, alkylene oxalate, cycloalkylene oxalate, alkylene succinate, â-hydroxybutyrate, substituted or unsubstituted trimethylene carbonate, 1,5-dioxepan-2-one, 1,4-dioxepan-2-one, glycolide, glycolic acid, L-lactide, D- lactide, DL-lactide, meso-lactide, and any optically active isomers, racemates or copolymers thereof. Provided that citric acid, å-caprolactone and glycolide are members of the polyester.
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