Polyimidosiloxane resin and composition thereof and method of ap

Details Polyimidosiloxane resin and composition thereof and method of ap Polyimidosiloxane resin and composition thereof and method of ap

1991-05-29

1993-10-12

Bleutge, John C.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525476, 525533, 528 26, 528 28, 528 38, C08G 6948, C08L 6300, C08L 7908

Patent

active

052527034

ABSTRACT:
A polyimidosiloxane material useful for forming, on a flexible substrate material, a flexible protective coating layer with a high heat resistance, electrical insulating property and curl-resistance, comprises a polymerization-imidization product of an aromatic tetracarboxylic acid component comprising, as a principal ingredient, 2,3,3',4'-biphenyltetracarboxylic dianhydride with a diamine component comprising, as a principal ingredient, a diaminopolysiloxane compound of the formula (I) ##STR1## wherein R.sub.1 is a divalent hydrocarbon residue, R.sub.2 is an C.sub.1-3 alkyl or phenyl group, n is an integer of 3 to 30, and is preferably used, optionally together with an epoxy resin, in the form of a solution or dispersion in an organic solvent to coat a flexible substrate material, for example, a flexible circuit element, therewith.

REFERENCES:
patent: 4410664 (1983-10-01), Lee
patent: 4734464 (1988-03-01), Biensan
patent: 4759987 (1988-07-01), Nizobe et al.
patent: 4778872 (1988-10-01), Sasaki et al.
patent: 4956437 (1990-09-01), Lee
patent: 5041513 (1991-08-01), Okinoshima et al.

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