Polyimide film

Details Polyimide film Polyimide film

1989-08-07

1991-12-03

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528126, 528128, 528173, 528179, 528185, 528188, 528351, 528352, 4284735, C08G 6926, C08G 802, C08G 7500

Patent

active

050701819

ABSTRACT:
Disclosed is a film of polyimide having repeating units of formula (1) and a birefringence (.DELTA.n) of at least 0.13: ##STR1## wherein R.sup.1 is an aromatic group having a valency of 4, at carbon atoms constituting the aromatic ring, and R.sup.2 is an aromatic group having a valency of 2, at carbon atoms constituting the aromatic ring. This polyimide film exhibits good thermal dimensional stability.

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patent: 4299750 (1981-11-01), Antonoplos
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patent: 4725484 (1988-02-01), Kumagawa et al.
patent: 4837299 (1989-06-01), Peters et al.
patent: 4886874 (1989-12-01), Nagano 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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