| 摘要 |
PROBLEM TO BE SOLVED: To obtain a biodegradable high molecular weight aliphatic copolyester to be formable into a film or a sheet having mechanical properties similar to those of polyethylene. SOLUTION: This copolyester has a molecular chain comprising a repeating unit (P) expressed by -CO-R<1> -COO-R<2> -O- (R<1> represents 1-12C divalent aliphatic group; R represents 2-12C divalent aliphatic group) and -CO-R<3> -O- (R<3> represents 1-10C divalent aliphatic group), wherein at least one divalent aliphatic group of R<1> , R<2> and R<3> comprises 0.01 to 50 mol% of branched divalent aliphatic group to the total 100 mol% of R<1> , R<2> and R<3> divalent aliphatic groups.
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