Process for producing melting-anisotropic, copolymerized polyester

摘要

PCT No. PCT/JP85/00094 Sec. 371 Date Oct. 31, 1985 Sec. 102(e) Date Oct. 31, 1985 PCT Filed Feb. 28, 1985 PCT Pub. No. WO85/03941 PCT Pub. Date Sep. 12, 1985.A process for producing a melting-anisotropic copolymerized polyester containing an alkylene terephthalate component, which comprises reacting a starting polyester composed of a dicarboxylic acid and a diol with an oxyaromatic carboxylic acid to form a copolymerized oligomer, then conducting acylating reaction by the addition of an acylating agent and further conducting polycondensating reduction thereby producing a melting-anisotropic, copolymerized polyester having a logarithmic viscosity of at least 0.2 dl/g. According to this process, a polyester of excellent physical property can be obtained at a good production efficiency.