Process for preparing polyesters

Details Process for preparing polyesters Process for preparing polyesters

1977-06-15

1978-11-07

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528279, 528280, 528281, 528282, 528283, 528284, 528285, 528277, 528276, 528275, 528180, 528181, 528193, 528194, 528273, C08G 6318, C08G 6322, C08G 6326, C08G 6328

Patent

active

041245660

ABSTRACT:
A process for preparing polyesters having superior thermal stability, transparency and chemical resistance, which comprises (1) a first step of esterifying (A) a difunctional carboxylic acid containing at least 60 mole% of an aromatic dicarboxylic acid, (B) 0 to 80 mole%, based on component (A), of an aliphatic diol and/or a dihydroxybenzene and (C) an aromatic monohydroxy compound in an amount of at least 210 mole% as a total of it and component (B) based on component (A), the esterification being performed until the degree of esterification reaches at least 80%, (2) subsequently, a second step of adding 0 to 80 mole%, based on component (A), of component (B) and a bisphenol (D) in an amount of 100 to 130 mole% as a total of it and component (B) based on component (A) to the reaction product obtained in the first step and reacting the mixture, the total amount of components (B) used in the first and second steps being 0 to 80 mole% based on component (C), and (3) performing at least the first of the above steps in the presence of an aromatic hydrocarbon medium having a boiling point of 105.degree. to 175.degree. C at normal atmospheric pressure and being inert at the reaction temperature.

REFERENCES:
patent: 3399170 (1968-08-01), Blaschke et al.
patent: 3413379 (1968-11-01), Schade et al.
patent: 3560439 (1971-02-01), Price et al.
patent: 3772405 (1973-11-01), Hamb

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