Insulated electrical conductor and method of making same

Claim 1

AN INSULATED ELECTRICAL CONDUCTOR COMPRISING A METALLIC CONDUCTOR, A SURROUNDING INSULATING LAYER OF A RUBBER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER AND RUBBERY BUTADIENE-STYRENE COPOLYMERS, SAID LAYER BEING DEPOSITED DIRECTLY FROM A LATEX OF SAID RUBBER, A THIN TIE LAYER COMPRISING A MIXTURE OF A RUBBER SELECTED FROM SAID GROUP, A VINYL RESIN SELECTED FROM THE GROUP CONSISTING OF POLYVINYL CHLORIDE AND COPOLYMERS OF VINYL CHORIDE AND A COPOLYMERIZABLE MONOMER, AND AN OILRESISTANT BUTADIENE-ACRYLONITRILE COPOLYMER WHICH IS A PLASTICIZER OF SAID VINYL RESIN, SURROUNDING SAID INSULATING LAYER, SAID TIE LAYER BEING DEPOSITED DIRECTLY FROM A LATEX MIXTURE OF A LATEX OF SAID RUBBER AND A LATEX OF SAID RESIN AND SAID BUTADIENE-ACRYLONITRILE COPOLYMER, AND AN ABRASION-, OIL-, LIGHT- AND OZONE-RESISTANT OUTER PROTECTIVE LAYER COMPRISING A HOMOGENOUS MIXTURE OF SAID VINYL RESIN AND SAID PLASTICIZING COPOLYMER, SAID OUTER LAYER BEING DEPOSITED DIRECTLY FROM A LATEX OF SAID RESIN AND SAID BUTADIENE-ACRYLONITRILE COPOLYMER, THE RUBBER IN SAID INSULATING AND TIE LAYERS BEING VULCANIZED AND SAID LAYERS BEING COALESCED AT THEIR INTERFACES.