Ester-amide block copolymer and process for producing same

摘要

An ester-amide block copolymer of the formula (1):rbon group with 6-20 carbon atoms and G is a residue of an aliphatic polyester, an aliphatic polycarbonate, an aliphatic polyethercarbonate or a polyorganosiloxane, and having a weight average molecular weight of 30,000-1,000,000. This copolymer is advantageously prepared by polycondensing an activated acyl lactam-terminated aromatic amide of the formula (2) with a diol of the formula (3) by bulk polymerization in a molten state: <IMAGE> (2) wherein R and G are the same as defined above.