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US 5,470,657 AGranted
Heat-resistant, high-voltage lead wire for direct current
AssigneeSumitomo Electric Industries, Ltd.
InventorHiroshi Hayami
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AssigneeSumitomo Electric Industries, Ltd.
InventorHiroshi Hayami
Estimating the term…
Disclosed is a heat-resistant, high-voltage insulated lead wire for direct current, which meets the demand for higher heat resistance, and its insulating coating over the conductor is formed by a polyolefin resin composition. The polyolefin resin composition is a flame-retarded resin composition comprising of a mixture of a polyethylene whose crystalline component has melting point higher than 125.degree. C. and a copolymer of ethylene and .alpha.-olefin, which contains a multifunctionalized monomer having unsaturated carbon-carbon bond moiety in the molecule as an indispensable component. The insulating coating made of this resin composition is irradiated by an ionizing radiation to give a heat-resistant, high-voltage lead wire for direct current, which has a perpendicular flame resistance (VW-1) acceptable in the UL Standards and has a temperature rating of higher than 125.degree. C.
An insulated high-voltage lead wire for direct current in which an insulating layer is formed over the conductor, said insulating layer comprising a polyolefin based resin composition, said polyolefin resin composition being a flame-retardant resin composition comprising a resin mixture (A) of 40 to 80% by weight a polyethylene, of which a crystalline component of the polyethylene has a melting point between about 125.degree. C. to 131.degree. C., and an ethylene-.alpha.-olefin copolymer, and a multi-functionalized monomer (B) having an unsaturated carbon-carbon bond moiety in its molecule as an indispensable component and wherein said insulating layer is irradiated by ionizing radiation.
Dependencies are inferred from the claim text.