Method of insulating electrical conductors by impregnation

Details Method of insulating electrical conductors by impregnation Method of insulating electrical conductors by impregnation

1986-10-20

1988-05-31

Page, Thurman K.

Coating processes

Electrical product produced

Coil or winding

156172, 427117, 427177, 427178, 427179, B05D 512

Patent

active

047480483

ABSTRACT:
A method of insulating electrical conductors wherein a tape of porous mica paper and of glass felt or cloth or plastic material film is wound round the conductors, wherein the tape is impregnated with a varnish comprising a polymerizable liquid resin, and wherein the impregnated tape is polymerized by heat treatment, the method including the improvement whereby an adhesive powder is initially added to the tape to provide adhesion between the porous mica paper and the glass felt or cloth or the plastic material film, said adhesive powder comprising a polymer having chains of oxazolidone groups containing groups with epoxy terminations, and whereby the polymerizable liquid resin of the varnish essentially contains isocyanate groups which are transformed into isocyanurate groups during polymerization.

REFERENCES:
patent: 2847395 (1958-08-01), Wear
patent: 4046938 (1977-09-01), Torossian et al.
patent: 4543272 (1985-09-01), Anton
patent: 4582723 (1986-04-01), Markert et al.
patent: 4606785 (1986-08-01), Zeise
8109 IEEE Trans. on Electrical Insulation, vol. EI-13, No. 6 (1978-12).

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