| 摘要 |
Polyesters such as poly(1,4-cyclohexanedimethyl-1,4-cyclohexanedicarboxylate) are prepared by the reaction of at least one relatively non-volatile diol, preferably 1,4-cyclohexanedimethanol, with a 1,4-cyclohexanedicarboxylic acid ester in the presence of a catalyst such as a tetraalkyl titanate. Maximum molecular weight and crystallinity are provided by at least one of two options: conducting the reaction at a series of progressively increasing temperatures below 265 DEG C, with a residence time in the range of 40-120 minutes at temperatures above 250 DEG C; and conducting an initial stage of the reaction in the presence of at least one C2-6 aliphatic diol such as ethylene glycol, diethylene glycol or 1,4-butanediol.
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