| abstract |
An anhydride-free insulation system for a current-carrying construction part, the insulation system comprising: (A) a mica paper or mica tape for the wrapping part of the electric engine potentially energizing during operation of the engine, wherein the mica paper or mica tape has a vacuum pressure Wherein the mica paper or the mica tape comprises one or more thermally activatable sulfonium salt initiators for homopolymerizing the epoxy resin present in the thermosetting epoxy resin formulation, wherein the thermosetting epoxy resin formulation is impregnated with a thermosetting epoxy resin formulation through vacuum pressure impregnation, Or mixtures thereof in an amount sufficient to homopolymerize the epoxy resin absorbed by the mica paper or mica tape and the component parts of the engine during the vacuum pressure infiltration step, ; (B) a thermally curable bath formulation for vacuum infiltration, (i) a polyglycidyl ether or mixture thereof, and (ii) an alicyclic epoxy resin comprising two or more epoxy groups fused to an alicyclic ring, or a mixture thereof, An insulating system comprising the formulation, wherein the formulation is substantially or preferably completely free of a thermally activatable curing initiator for the epoxy resin formulation. |