Abstract:
1. AN ARTICLE COMPRISING (A) A FLAT BOARD WHICH COMPRISES (1) ABOUT 15 TO ABOUT 70% OF A HARDENED, SYNTHETIC, ORGANIC RESIN; (2) ABOUT 30 TO ABOUT 85% NON-CONDUCTIVE FILLER; AND (3) ABOUT 0.001 TO ABOUT 1.0% OF A SURFACTANT HAVING A PERFLUORINATED CHAIN AT LEAST THREE CARBON ATOMS ALONG AT ONE END AND A POLAR GROUP AT THE OTHER END, SAID SURFACTANT POSSESSING THE PROPERTY OF LOWERING THE SURFACE ENERGY OF SAID RESIN BY FREELY MIGRATING TO THE SURFACE OF SAID RESIN AND TO ITS INTERFACES WITH SAID FILLER AFTER SAID RESIN IS HARDENED; AND (B) A CONDUCTING CIRCUIT BONDED TO AT LEAST ONE SIDE OF SAID FLAT BOARD.
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.