Compositions for forming insulating films on electromagnetic ste

Details Compositions for forming insulating films on electromagnetic ste Compositions for forming insulating films on electromagnetic ste

1987-11-05

1989-05-16

Bell, Janyce

Coating processes

Magnetic base or coating

148251, 148245, 252623V, 4273884, B05D 512

Patent

active

048308773

ABSTRACT:
The present invention provides an insulating film-forming composition in which a mixed resinous liquid obtained from a specific proportion of an aqueous emulsion of an acrylic resin and/or an acryl-styrene base resin and an aqueous dispersion of PAN free substantially from any emulsifier/dispersant is added to and mixed with an inorganic film-forming composition containing as the main component a chromate or a chromate plus a phosphate, which has conventionally been used in the prior art, in a specific proportion, and a method for forming an insulating film by coating and drying such a composition on an electromagnetic steel plate. A substantial portion of the starting materials can be commerically available products. With the composition, provided to have a longer pot life, and method of the present invention, an efficient coating can be carried out, while suppressing foaming to a consideraly low level, thereby obtaining an insulating film excelling in insulating properties and other film properties.

REFERENCES:
patent: 2902390 (1959-09-01), Bell
patent: 3061563 (1962-10-01), Zdanowski et al.
patent: 3793073 (1974-02-01), Kitayama et al.
patent: 3873349 (1975-03-01), Kimura et al.
patent: 4032675 (1977-06-01), Irie et al.
patent: 4253886 (1981-03-01), Aonuma et al.
patent: 4618377 (1986-10-01), Nakamura et al.

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