Process for preparing an ether solution of polyamic acids and po

Details Process for preparing an ether solution of polyamic acids and po Process for preparing an ether solution of polyamic acids and po

1982-07-01

1985-12-24

Reamer, James H.

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...

524600, 528222, 528229, 564329, 568306, C08L 6100, C08L 7710

Patent

active

045607214

ABSTRACT:
A novel ether solution of dinitrobenzophenone and a process for preparing an ether solution of diaminobenzophenone therefrom which comprises subjecting a dinitrobenzophenone dissolved in said ether solvent to hydrogenation in contact with a continuous nickel catalyst to obtain said solution of diaminobenzophenone dissolved in said ether solvent. In a specific embodiment said nickel catalyst is mounted on an inert support. In a still further embodiment, said diaminobenzophenone dissolved in said ether solvent, after removal of water therefrom, is reacted with an aromatic dianhydride to obtain a polyamic acid solution. The polyamic acid solution can be heated at a temperature above 100.degree. C. to drive off water of cyclization and thereby obtain the corresponding polyimide resin.

REFERENCES:
patent: 3014908 (1961-12-01), Coleman et al.
patent: 3075007 (1963-01-01), McCracken et al.
patent: 3175007 (1965-03-01), Berhenke
patent: 3869513 (1975-03-01), Buckman et al.
patent: 3975444 (1976-08-01), Kovar et al.
patent: 4320217 (1982-03-01), D'Alelio et al.
Degering, An Outline of Organic Nitrogen Compounds, University Lithoprinters, Ypsilanti, Mich. (1950), pp. 295-296.

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