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AssigneeNippon Petrochemicals Company, Limited
InventorsYuichi Orikasa, Shinji Kojima, Takashi Inoue, Kaoru Yamamoto, Atsushi Sato, Shigenobu Kawakami
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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.
A novel ethylene copolymer 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) ##STR5## wherein Ar is R1 ? ##STR6## 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.
Dependencies are inferred from the claim text.