Stabilized varnish without solvent for impregnating electric winding insulation
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United States of America Patent
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Jul 12, 1988
Issued Date -
N/A
app pub date -
Aug 14, 1986
filing date -
Jul 13, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Process for insulating by impregnation an electric winding with isocyanurate and oxazolidone cycles resins, in which one wraps around the conductors a glass cloth and porous mica paper tape loaded with a quaternary ammonium salt catalyzing the condensation of the isocyanate and epoxy compounds into isocyanurate and oxazolidone cycles, one impregnates the tape with a varnish containing an isocyanate compound and a liquid epoxy resin, then one subjects the impregnated tape to a varnish polymerization thermal treatment. One uses as a quaternary ammonium salt a benzyl-trialkylammonium halide with an alkyl chain containing at the most 3 carbon atoms.
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