摘要：

A biodegradable aliphatic polyester elastomer which has rubber- like elasticity, hardness of 80 or less in accordance with ASTM D 676- 58T, and elastic modulus from 1×10.sup.5 Pa to 1×10.sup.8 Pa at 25. degree. C., and decomposes with ease in the natural environment, under composting conditions or under hydrolysis conditions. The biodegradable aliphatic elastomer can be obtained by crosslinking aliphatic polyester containing aliphatic unsaturated polybasic acid as a polymer constituting ingredient and having a weight average molecular weight of 15,000 or more.

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