Abstract:
A composite structure is disclosed which comprises a layer of glass cloth and a layer of mica paper impregnated and bonded together with a B-stage dephenyl oxide resin composition. The structure may be in the form of a tape or of a sheet and is used as insulation over electrical conductors. The dephenyl oxide composition preferably comprises a mixture of methoxy methyl diphenyl oxide and chloromethyl diphenyl oxide and a curing catalyst of finely divided silica containing a small amount of iron metal.
Abstract:
A RESINOUS COMPOSITION, SUITABLE AS A SOLVENTLESS IMPREGNATING RESIN FOR LARGE ROTATING APPARATUS INSULATION, IS MADE FROM A MIXTURE CONTAINING ABOUT 85 TO 115 PARTS OF A BISPHENOL A OR NOVOLAC GLYCIDYL ETHER EPOXY RESIN, ABOUT 100 TO 155 PARTS OF AN ACID ANHYDRIDE AND ABOUT 25 TO 95 PARTS OF A DIGLYCIDYL ETHER OF NEOPENTYL GLYCOL.