Polyamic acids, polyimides prepared from these and process for p

Details Polyamic acids, polyimides prepared from these and process for p Polyamic acids, polyimides prepared from these and process for p

1987-05-04

1989-10-03

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528185, 528125, 528126, 528128, C08G 6926

Patent

active

048718335

ABSTRACT:
Described are polyamic acids, at least 50 mole-% of which are comprised of recurrent units corresponding to the general formula I: ##STR1## wherein, R.sup.1 is a mono-, di-, tri- or tetranuclear aromatic group and

REFERENCES:
patent: 3179614 (1965-04-01), Edwards
patent: 4063984 (1977-12-01), Critchley
patent: 4535115 (1985-08-01), Bakshi et al.
patent: 4629777 (1987-12-01), Pfeifer
"Patent Abstracts of Japan", Band 7, No. 273 (C-198) [1418], Dec. 6, 1983.
"Patent Abstracts of Japan", Band 8, No. 232 (C-248) [1669], Oct. 25, 1984.
Industry News, "Ultrapure Polyimide Spurs use in the Semiconductor Industry", reprinted from Semiconductor Int'l. 1/84, Dupont, 18 pages.

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