Method and composition for preparing aromatic polycarboxylic aci

Details Method and composition for preparing aromatic polycarboxylic aci Method and composition for preparing aromatic polycarboxylic aci

1985-01-14

1986-04-22

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562429, 562432, 562460, 562473, C07D30789, C07C 6300

Patent

active

045843880

ABSTRACT:
Aromatic polycarboxylic acids and their anhydrides such as bisphenol A dianhydride are prepared from the corresponding polycarboximides, such as bisphenol A bisimide, by an exchange reaction with phthalic acid or phthalic anhydride and water in the presence of dimethyl-n-butylamine as an exchange catalyst. The use of this amine results in the formation of a product of decreased color, as compared with the use of triethylamine.

REFERENCES:
patent: 4116980 (1978-09-01), Webb
patent: 4329292 (1982-05-01), Webb

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