Polyimide having excellent thermal dimensional stability

Details Polyimide having excellent thermal dimensional stability Polyimide having excellent thermal dimensional stability

1988-01-20

1989-12-12

Kight, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528128, 528170, 528171, 528185, 528187, 528351, C08G 6926

Patent

active

048868744

ABSTRACT:
A polyimide copolymer having a repeating unit of formula (I): ##STR1## wherein each of R.sub.1 and R.sub.2 is independently ##STR2## and R.sub.1 and R.sub.2 are different from each other, R.sub.0 is an aromatic group having a valency of 4, and m is a positive integer. The polyimide copolymer is excellent in heat resistance, mechanical properties (e.g., tensile elongation) and thermal dimensional stability.

REFERENCES:
patent: 4255313 (1981-03-01), Antonoplos et al.
patent: 4299750 (1981-11-01), Antonoplos et al.
patent: 4405770 (1983-09-01), Schoenberg et al.
Yang et al, Journal of Applied Polymer Science, vol. 31, pp. 979-995 (1986), "Synthesis and Properties of Copolypyromellitimides".

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