Polyester resin, compositions thereof and sealant made therefrom

摘要

A polyester resin (A) having branched chain, a reduction viscosity ( eta sp/c) of not less than 0.7, and a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250x103 and not more than 800x103, a polyester resin composition comprised of resin (A) and a polyester resin (B) without branched chain and having a reduction viscosity ( eta sp/c) of not less than 0.7., and a polyester resin composition comprised of resin (A) and a polyester resin (C) having branched chain and a melting point lower than that of the polyester resin (A). The sealant made from the polyester resin (A), or the resin compositions of the present invention is superior in heat-sealing properties, flavor retention, and film moldability (extrusion processing characteristics), and is suitable for a sealant for paper and plastic food containers.