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    • 7. 发明专利
    • PRODUCTION OF COPOLYESTER
    • JPS5716025A
    • 1982-01-27
    • JP9072480
    • 1980-07-04
    • TORAY INDUSTRIES
    • INOUE SHIYUNEIHORIUCHI KENJIROUYANAGI MASAKATA
    • C08G63/00C08G63/181
    • PURPOSE:To produce a copolyester having high rigidity, a high m.p., excellent heat resistance and good color, by esterifying a specified dicarboxylic acid with a specified alkylene glycol and polycondensing the resulting ester. CONSTITUTION:A reaction product, conversion to ester >=90%, is obtained by esterifying (A) a dicarboxylic acid consisting of 45-80mol% diphenyl-4,4'-dicarboxylic acid and 55-20mol% hexahydroterephthalic acid, cis content 30- 100mol%, with (B) an alkylene glycol such as ethylene glycol at a B/Amol ratio of 1.1-4.0 and a temperature of 220-280 deg.C in the presence of an esterification catalyst. Next, this reaction product is passed through a filter to remove foreign matters. Then, the filtered product is made to polymerize in the presence of a polycondensation catalyst; evacuation of the polymerization kettle is started when the kettle temperature reaches a range of 230-260 deg.C; and when a degree of vacuum of 1mm.Hg is reached, the polycondensation is continued at a kettle temperature in the range of 260-310 deg.C.