Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1989-02-24
1990-10-16
Marquis, Melvin I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 38, 528 28, 528 27, C08G 7704
Patent
active
049636359
ABSTRACT:
The present invention provides a process for the production of silicon-containing polyimide presursors that have a viscosity most suitable for application, and when baked, can form a coating low in hygroscopicity, heat resistant, and having powerful adhesion, and a process for their cured silicon-containing polyimide.
A process for the production of silicon-containing polyimide precursors having a logarithmic viscosity number of 0.05 to 5 dl/g by reacting A.sup.1 mol of fluorine-containing diacid anhydride, A.sup.2 mol of a diacid anhydride, B.sup.1 mol of a fluorine-containing diamine, B.sup.2 mol of a diamine, and C mol of an aminosilane with the mixing ratio of them such that A.sup.1, A.sup.2, B.sup.1, B.sup.2, and C are within ranges having prescribed relationships, and a process for the production of a silicon-containing polyimide by baking a solution of said precursor at 50.degree. to 500.degree. C.
REFERENCES:
patent: 4748228 (1988-05-01), Shoji et al.
patent: 4818806 (1989-04-01), Kunimune et al.
Kunimune Kouichi
Kutsuzawa Yoshiya
Chisso Corporation
Hellender Karen A.
Marquis Melvin I.
Philpitt Fred
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