Copolyesteramide and production of the same

摘要

A copolymer having high strength and high elastic modulus is produced by copolymerizing (a) a polyamide oligomer prepared from a piperazine compound and an aromatic dicarboxylic acid and (b) a polyalkylene terephthalate monomer or a prepolymer thereof. The copolymer is useful as a rubber reinforcing fiber, a magnetic tape base film, and a coating material.