| abstract |
(57) [Summary] [Structure] In the plasticizer for poly (R) -3-human oxybutyric acid, the following general formula (I) or (II) Or a block copolymer polyester (ester-carbonate). [Effect] The biodegradable polymer composition containing this plasticizer is not only biodegradable but also improved in elongation rate and improved in brittleness, and has no new decrease in tensile strength. It becomes a polymer composition. |