An ester-amide block copolymer of the formula (1): ##STR1## wherein R is an aromatic hydrocarbon 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: ##STR2## wherein R and G are the same as defined above.
公式(1)的酯酰胺嵌段共聚物:##STR1##
其中R是具有6-20个碳原子的芳香族碳氢基团,G是脂肪族聚酯、脂肪族聚
碳酸酯、脂肪族聚醚
碳酸酯或聚有机
硅氧烷的残基,并且具有30,000-1,000,000的重均分子量。该共聚物通过在熔融状态下通过大块聚合反应将公式(2)的活性酰内酯末端的芳香族酰胺与公式(3)的二元醇进行聚缩合制备:##STR2##
其中R和G与上述定义相同。