Abstract:
Electrical insulation system, comprising a polymeric material and optionally a filler material and/or further additives, wherein said polymeric material is a polybenzoxazine.
Abstract:
A diluent free epoxy resin formulation, which is suitable for the use as coil insulation material, wherein said formulation comprises (a) a purified grade of at least one diglycidyl ether of a bisphenol compound or at least one cycloaliphatic diglycidyl ether compound or a mixture of such compounds, wherein said compounds have an epoxy equivalent weight not exceeding 10% of the minimum epoxy equivalent weight calculated for each compound; and (b) that said formulation optionally further comprises up to 50% by weight of a diglycidyl ether of a bisphenol compound or of a cycloaliphatic diglycidyl ether compound or a novolac epoxy or a mixture of such compounds, wherein said compounds have an epoxy equivalent weight exceeding 10% of the minimum epoxy equivalent weight calculated for each compound; and (c) a polymerization catalyst; an electric conductor carrying an impregnated insulation layer insulated with a diluent free epoxy resin formulation as coil insulation material according to the invention.