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AssigneeNippon Petrochemicals Company, Limited
InventorsKaoru Yamamoto, Takashi Inoue, Shinji Kojima, Sadahiro Nishimura
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Provided is a power cable coating composition comprising a copolymer of ethylene or ethylene and an .alpha.-olefin with 0.02-2 mol % of a cyclic non-conjugated diene, said copolymer being prepared by a high-pressure radical polymerization process, said copolymer having a melt index of 0.2-10 g/10 min and an iodine value in the range of 0.2 to 20, and not more than 2.5 parts by weight, based on 100 parts by weight of said copolymer, of a peroxide, said composition on heat-crosslinking affording a crosslinked product having at least the following properties: (a) a percent heat-deformation at 120.degree. C. not more than 20%, and (b) a maximum peak temperature (Tm) not lower than 100.degree. C. measured according to the differential scanning calorimetry (DSC).
A power cable coating composition comprising a copolymer of ethylene or ethylene and an .alpha.-olefin with 0.02-2 mol % of a cyclic non-conjugated diene, wherein the amount of the .alpha.-olefin copolymerized in said copolymer is in the range of 0 to 3 mol % in terms of monomer, said copolymer being prepared by a high-pressure radical polymerization process, said copolymer having a melt index of 0.2-10 g/10 min and iodine value in the range of 0.2 to 20, and not more than 2.5 parts by weight, based on 100 parts by weight of said copolymer, of a peroxide, said composition on heat-crosslinking affording a crosslinked product having at least the following properties:
A method for forming an insulation coating on a power cable, which method comprises extrusion-coating a composition onto a cable conductor, and then heating the composition to allow crosslinking to take place to thereby convert the composition into a crosslinked product having at least the following properties:
Dependencies are inferred from the claim text.