Preparation of aqueous thermosetting electrical insulating varni

Details Preparation of aqueous thermosetting electrical insulating varni Preparation of aqueous thermosetting electrical insulating varni

1982-09-17

1984-01-31

Griffin, Ronald W.

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...

428458, 528288, 528289, 528322, B32B 1500, C09D 364, C09D 525, H01B 342

Patent

active

044290721

ABSTRACT:
A process for the preparation of aqueous thermosetting electrical insulating varnishes, wherein polyester-imide precondensates are prepared by condensing aromatic tricarboxylic acid monoanhydrides, diamines, diols, triols containing an isocyanurate ring, and cyclic trimerization products of diisocyanates, whose free isocyanate groups are blocked, with or without aromatic dicarboxylic acids or their esterifiable derivatives, and are reacted, at from 50.degree. to 200.degree. C., with or without addition of from 1 to 10% by weight, based on polyester-imide, of a polar organic solvent, with ammonia or an organic amine, and then diluted with fully demineralized water, with or without addition of a water-soluble curing catalyst. The novel electrical insulating varnishes are used as wire enamels or impregnating varnishes.

REFERENCES:
patent: 3425866 (1969-02-01), Meyer et al.
patent: 3426098 (1969-02-01), Meyer et al.
patent: 4018736 (1977-04-01), Fabian et al.
patent: 4104221 (1978-08-01), Janssen et al.
patent: 4206261 (1980-06-01), Laganis et al.
patent: 4307226 (1981-12-01), Bolon et al.

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