Abstract: 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/cm.sup.2 at a polymerization temperature of 50.degree. to 400.degree. C., with the ethylene copolymer containing 0.005 to 1 mol % of a unit derived from the aromatic compound.

Abstract: The present invention provides a method for improving impulse destructive strength of an electrical insulating material which is characterized by employing, as the electrical insulating material, a random copolymer of a styrene series monomer and ethylene or a combination of ethylene and another ethylenic unsaturated monomer, or a composition in which the copolymer is blended with an ethylene series polymer, the copolymer being prepared by introducing, into a reaction system, the styrene series monomer selected from the group of styrene and single-ring substituted styrenes, ethylene or the combination of ethylene and the ethylenic unsaturated monomer and a polymerization initiator, the latter being introduced thereinto separately from at least the styrene series monomer, and subjecting these monomers to a high-pressure radical copolymerization under a polymerization pressure of 500 to 4,000 kg/cm.sup.2 at a polymerization temperature of 50.degree. to 400.degree. C.

Abstract: Adhesive resins obtained by reacting 100 parts by weight of an epoxy group-containing olefin polymer with 0.01-10 parts by weight of at least one ethylenically unsaturated fatty acid or derivative thereof, are described. The adhesive resins or olefin polymer compositions comprising the adhesive resins are particularly useful in lamination with other types of resins. Such laminates are also described.

Abstract: A novel ethylene copolymer useful for electric insulating materials is obtained by a high-pressure radical polymerization at a pressure of 500 to 4,000 kg/cm.sup.2 at a temperature of 130.degree. to 400.degree. C. and which comprises 95.0 to 99.995 mol % of an ethylene unit, 0.005 to 2 mol % of a comonomer unit represented by the formula (I) ##STR1## wherein Ar is ##STR2## R.sub.1 is an alkylene group having 1 or 2 carbon atoms, each of R.sub.2 and R.sub.3 is a hydrogen atom, or a straight-chain or a side-chain alkyl group having 1 to 4 carbon atoms, and 0 to 3 mol % of an ethylenic unsaturated monomer unit, said ethylene copolymer having a density of 0.910 to 0.940 g/cm.sup.3 and a melt index of 0.05 to 100 g/10 minutes.

Abstract: The present invention provides an ethylene copolymer comprising 85.0 to 99.995 mol % of an ethylene unit, 0.005 to 5 mol % of a comonomer unit represented by the formula (I) ##STR1## wherein Ar is ##STR2## R.sub.1 is a hydrogen atom or a methyl group, each of R.sub.2 and R.sub.3 is a hydrogen atom, a chlorine atom or a straight-chain or a side-chain alkyl group having 1 to 4 carbon atoms, and 0 to 10 mol % of an ethylenic unsaturated monomer unit, the ethylene copolymer having a density of 0.860 to 0.970 g/cm.sup.3 and a melt index of 0.05 to 100 g/10 minutes.

Abstract: Novel multi-layer laminate articles of improved adhesion strength comprising at least two layers including a polyester resin layer and a layer of an epoxy group-containing olefin polymer or an olefin polymer composition comprising the epoxy group-containing polymer, are described. The epoxy group-containing olefin polymer is a copolymer of an olefin and an unsaturated glycidyl group-containing monomer or a copolymer of an olefin, an unsaturated glycidyl group-containing monomer and an ethylenically unsaturated monomer.

Abstract: Adhesive resins obtained by reacting 100 parts by weight of an epoxy-containing olefin polymer with 0.01-10 parts by weight of at least one ethylenically unsaturated fatty acid or derivative thereof, are described. The adhesive resins or olefin polymer compositions comprising the adhesive resins are particularly useful in lamination with other types of resins. Such laminates are also described.