Biodegradable aliphatic copolyester and method of preparing same

摘要

An aliphatic copolyester having a plurality of first: ester units of the formula:wherein R1 represents a divalent aliphatic group, R2 represents a divalent aliphatic and t is an integer of 0 or 1, and a plurality of second ester units of the formula:wherein R1 and t are as defined above and R3 represents an aliphatic group. The molar ratio of the first ester unit to the second ester unit is 90:10 to 99.9:0.1. The copolyester is produced by reacting an aliphatic diester with an aliphatic glycol and with a monoacylated glycerin under ester exchanging conditions.