Polyimide varnish

Details Polyimide varnish Polyimide varnish

1994-12-23

1995-10-24

Michl, Paul R.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524320, 524600, 528348, 528350, 528351, 528353, C08J 311, C08K 510, C08L 7908

Patent

active

054610990

ABSTRACT:
A polyimide varnish which is a solution having a polyimide and/or a polyimide precursor dissolved in an organic solvent and which is useful for forming a polyimide coating film on a substrate by coating the solution on the substrate followed by heat treatment, wherein from 5 wt % to 60 wt % of the organic solvent is a lactic acid derivative of the formula (I): ##STR1## wherein each of R.sup.1 and R.sup.2 which are independent of each other, is hydrogen, a C.sub.1-5 alkyl group or a C.sub.1-5 alkenyl group.

REFERENCES:
patent: 4863828 (1989-09-01), Kawabe et al.
patent: 5302489 (1994-04-01), Shu
Patent Abstracts of Japan, vol. 18, No. 17 (E1488) (6357), Jan. 12, 1994, JP-5-258611, Oct. 8, 1993.
Patent Abstracts of Japan, vol. 18, No. 668 (C-1289) (7008), Dec. 16, 1994, JP-6-264026, Sep. 30, 1994.

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