Process for preparing polyethylene naphthalate

Details Process for preparing polyethylene naphthalate Process for preparing polyethylene naphthalate

1993-03-15

1994-03-15

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528275, 528280, 528281, 528282, 528283, 528284, 528285, 528298, 528308, 528485, 528503, C08G 6378

Patent

active

052946959

ABSTRACT:
The present invention relates to a process for preparing a polyethylene naphthalate possessed with high viscosity, characterized by sloving of various problems of the prior art by controlling the rate of the polycondensation reaction.
Particularly, the present invention provides a process for preparing polyethylene naphthalate from an esterification reaction product of naphtalene dicarboxylic acid or an alkyl ester thereof and a diol, which comprises polycondensing the esterification reaction product in the presence of a polycondensation catalyst in two steps wherein the first step is carried out at a pressure ranging from 500 to 30 torr and the second step is carried out at a pressure ranging from 10 to 0.1 torr with controlling the reaction rate such that the differential increase of the intrinsic viscosity of the resultant polymer can satisfy the following equations:

REFERENCES:
patent: 4066624 (1978-01-01), Kawase et al.
patent: 4729915 (1988-03-01), Sakamoto et al.
patent: 4804736 (1989-02-01), Utsumi

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