| 摘要 |
To provide a polyester resin having 1,4-CHDA as the main dicarboxylic acid units, having isomerization of trans-1,4-CHDA suppressed in the esterification and polyconsensation reactions and having a high melting point and excellent heat resistance, and a process for its production. A polyester resin obtainable by preparing an oligomer by an esterification reaction of a dicarboxylic acid component containing 1,4-cyclohexane dicarboxylic acid as the main component, with a diol component, and polycondensing this oligomer in the presence of a polycondensation catalyst; and a process for producing a polyester resin characterized in that the esterification reaction is carried out by means of a basic compound, and then, the polycondensation reaction is carried out by means of a polycondensation catalyst. In the resent invention, T0 and Tp satisfy 0<={(T0-Tp)/T0}x100<=12 where T0 is the mol % of the trans form in the 1,4-cyclohexane dicarboxylic acid contained in the starting material, and Tp is the mol % of the trans form in the 1,4-cyclohexane dicarboxylic acid units contained in the obtainable polyester resin.
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