Siloxane-modified polyimide precursor and polyimide

Details Siloxane-modified polyimide precursor and polyimide Siloxane-modified polyimide precursor and polyimide

1984-09-25

1985-05-28

Lee, Lester L.

Stock material or miscellaneous articles

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Of quartz or glass

428446, 428447, 4284735, 4284744, 528 26, 528125, 528128, 528172, 188352, 188353, C08G 7310

Patent

active

045200750

ABSTRACT:
A siloxane-modified polyimide precursor which can be converted into a polyimide having excellent adhesion and moisture resistance is produced by simultaneously polymerizing a diaminosiloxane and a diamine containing no silicon atoms in its molecule with 3,3',4,4'-biphenyltetracarboxylic dianhydride, wherein the diaminosiloxane is used in an amount of 1 to 4 mole % per mole of the total diamino compounds and such that the silicon content in the final reaction product is 0.5 wt % or less. The thus obtained precursor solution is further heat aged to reduce the molecular weight of the precursor so that solution viscosity is decreased to a proper level suitable for coating operation.

REFERENCES:
patent: 3740305 (1973-06-01), Hoback et al.
patent: 4051163 (1977-09-01), Berger
patent: 4338426 (1982-07-01), Sato et al.

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