Method for preparing poly(1,4-cyclohexanedicarboxylates)

Details Method for preparing poly(1,4-cyclohexanedicarboxylates) Method for preparing poly(1,4-cyclohexanedicarboxylates)

1999-03-30

2000-07-04

Mosley-Boykin, Terressa

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528271, C08G 6302

Patent

active

060840552

ABSTRACT:
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.degree. C., with a residence time in the range of 40-120 minutes at temperatures above 250.degree. C.; and conducting an initial stage of the reaction in the presence of at least one C.sub.2-6 aliphatic diol such as ethylene glycol, diethylene glycol or 1,4-butanediol.

REFERENCES:
patent: 2901466 (1959-08-01), Kibler et al.
patent: 4003883 (1977-01-01), Fagerburg et al.
patent: 5646236 (1997-07-01), Schafheutle et al.
patent: 5723562 (1998-03-01), Stein

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