| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyester having satisfactory color tone, capable of manifesting an excellent heat stability in molten state, having improved moldability by carrying out a polycondensation reaction of ethylene glycol ester and/or their low polymer in the presence of a specific catalyst. SOLUTION: This polyester is obtained by polycondensating (A) ethylene glycol ester of a divalent aromatic carboxylic acid and/or their low polymer in the presence of a catalyst (B) a reaction product of a titanium compound obtained by previously reacting (i) a compound of formula I (R is a C>=2 alkyl) and a polyvalent aromatic carboxylic acid (acid anhydride) of formula II (n is 2-4) and (ii) a phosphorus compound of formula III (R is H or a C>=1 alkyl; n is 0-3) in a molar ratio of 1/1-1/5. The preferable amount of the component B is 10-40 mmol% in terms of titanium atom based on whole acid components composing the polyester.
|
