| abstract |
Polyesters such as poly(1,4-cyclohexanedimethyl-1,4-cyclohexanedicarboxylate)nare prepared by the reaction of at least one relatively non-volatilendiol, preferably 1,4-cyclohexanedimethanol, with an1,4-cyclohexanedicarboxylic acid ester in the presence of a catalyst suchnas a tetraalkyl titanate. Maximum molecular weight and crystallinity arenprovided by at least one of two options: conducting the reaction at a seriesnof progressively increasing temperatures below 265°C, with a residencentime in the range of 40-120 minutes at temperatures above 250°C; andnconducting an initial stage of the reaction in the presence of at least onenC 2-6 aliphatic diol such as ethylene glycol, diethylene glycol orn1,4-butanediol. |