ELECTRICAL INSULATING MATERIALS

摘要

The present invention provides an electrical insulating material which comprises an ethylene copolymer prepared by subjecting, to a high-pressure radical polymerization, ethylene or a mixture of ethylene and at most 3 mol % of another monomer in the presence of one- to three-ring aromatic compound having at least two carbon-carbon double bonds, which are different from each other in reactivity in radical polymerization, in one molecule at a polymerization pressure of 500 to 4,000 kg/cm2 at a polymerization temperature of 50 DEG to 400 DEG C., with the ethylene copolymer containing 0.005 to 1 mol % of a unit derived from the aromatic compound.