# US 12,112,864 B2 · Electrical insulation composition and power cable > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,112,864 B2 - Document ID: US12112864B2 - Status: Granted - Kind: B2 - Application number: 17/428,135 - Filed: 2020-01-10 - Published: 2022-04-28 - Granted: 2024-10-08 - Earliest claimed: 2019-04-04 - Assignees: Sumitomo Electric Industries, Ltd. - Applicants: Sumitomo Electric Industries, Ltd. - Inventors: Satoshi Yamasaki; Takanori Yamazaki - Web page: https://patentgrep.com/patent/US12112864B2 ## CPC - H01B 3/44: vinyl resins; acrylic resins (silicones H01B3/46) - C08K 5/14: Peroxides - C08K 5/20: Carboxylic acid amides - C08L 23/06: Polyethylene - C08L 25/06: Polystyrene - H01B 9/027: {composed of semi-conducting layers} - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract An electrical insulation composition includes a base resin containing 65 parts by mass or more and 98 parts by mass or less of a polyethylene and 2 parts by mass or more and 35 parts by mass or less of a styrene-containing resin, the polyethylene and the styrene-containing resin totaling 100 parts by mass, and 0.05 parts by mass or more and 1.0 parts by mass or less of a fatty acid amide. ## Claims ### Claim 1 An electrical insulation composition included in an insulation layer of a power cable, the electrical insulation composition comprising: a base resin containing 65 parts by mass or more and 98 parts by mass or less of a polyethylene and 2 parts by mass or more and 35 parts by mass or less of styrene-based thermoplastic elastomer, the polyethylene and the styrene-based thermoplastic elastomer totaling 100 parts by mass; and 0.05 parts by mass or more and 1.0 parts by mass or less of a fatty acid amide, wherein no constitutional unit containing an oxygen atom is bonded to the polyethylene, a density of the polyethylene is 0.91 g/cm3 or more and 0.945 g/cm3 or less, the base resin is crosslinked with an organic peroxide, and a gel fraction of the electrical insulation composition is more than 68%. ### Claim 2 (depends on 1) The electrical insulation composition according to claim 1, wherein a maximum length of a water tree generated in the electrical insulation composition is less than 200 μm when an AC electric field of 4 kV/mm at a commercial frequency is applied to the electrical insulation composition for 1,000 hours, with the electrical insulation composition comprising the base resin and the fatty acid amide being immersed in 1 N NaCl aqueous solution at 27° C. ### Claim 3 (depends on 1) The electrical insulation composition according to claim 1, wherein a number density of water trees having a length of 30 μm or more generated in the electrical insulation composition is less than 200 cm-3 when an AC electric field of 4 kV/mm at a commercial frequency is applied to the electrical insulation composition for 1,000 hours, with the electrical insulation composition comprising the base resin and the fatty acid amide being immersed in 1 N NaCl aqueous solution at 27° C. ### Claim 4 (depends on 1) The electrical insulation composition according to claim 1, wherein a content percentage of styrene in the styrene-based thermoplastic elastomer is less than 45% by mass. ### Claim 5 (depends on 1) The electrical insulation composition according to claim 1, wherein a total content of the styrene in the base resin is 0.15 parts by mass or more and 11 parts by mass or less with respect to 100 parts by mass of the base resin. ### Claim 6 (depends on 1) The electrical insulation composition according to claim 1, wherein a ratio of the total content of the styrene in the base resin to a content of the fatty acid amide is 1.5 or more and 110 or less. ### Claim 7 (depends on 1) The electrical insulation composition according to claim 1, further comprising 0.1 parts by mass or more and 10 parts by mass or less of an unsaturated dimer of α-aromatic substituted α-methylalkene. ### Claim 8 (depends on 1) The electrical insulation composition according to claim 1, wherein the fatty acid amide is a fatty acid monoamide. ### Claim 9 (depends on 1) The electrical insulation composition according to claim 1, wherein the fatty acid amide is an unsaturated fatty acid amide. ### Claim 10 A power cable comprising: a conductor; and an insulation layer provided to cover an outer periphery of the conductor, the insulation layer including an electrical insulation composition comprising: a base resin containing 65 parts by mass or more and 98 parts by mass or less of a polyethylene and 2 parts by mass or more and 35 parts by mass or less of a styrene-based thermoplastic elastomer, the polyethylene and the styrene-based thermoplastic elastomer totaling 100 parts by mass, and 0.05 parts by mass or more and 1.0 parts by mass or less of a fatty acid amide, wherein no constitutional unit containing an oxygen atom is bonded to the polyethylene, a density of the polyethylene is 0.91 g/cm3 or more and 0.945 g/cm3 or less, the base resin is crosslinked with an organic peroxide, and a gel fraction of the electrical insulation composition is more than 68%. ### Claim 11 (depends on 10) The power cable according to claim 10, wherein a maximum length of a water tree generated in the electrical insulation composition is less than 200 μm when an AC electric field of 4 kV/mm at a commercial frequency is applied to the electrical insulation composition for 1,000 hours, with the electrical insulation composition being immersed in 1 N NaCl aqueous solution at 27° C. ### Claim 12 (depends on 10) The power cable according to claim 10, wherein a number density of water trees having a length of 30 μm or more generated in the electrical insulation composition is less than 200 cm 3 when an AC electric field of 4 kV/mm at a commercial frequency is applied to the electrical insulation composition for 1,000 hours, with the electrical insulation composition being immersed in 1 N NaCl aqueous solution at 27° C. ### Claim 13 (depends on 10) The power cable according to claim 10, wherein a content percentage of styrene in the styrene-based thermoplastic elastomer is less than 45% by mass. ### Claim 14 (depends on 10) The power cable according to claim 10, wherein a total content of the styrene in the base resin is 0.15 parts by mass or more and 11 parts by mass or less with respect to 100 parts by mass of the base resin. ### Claim 15 (depends on 10) The power cable according to claim 10, wherein a ratio of the total content of the styrene in the base resin to a content of the fatty acid amide is 1.5 or more and 110 or less. ### Claim 16 (depends on 10) The power cable according to claim 10, wherein the electrical insulation composition further comprising 0.1 parts by mass or more and 10 parts by mass or less of an unsaturated dimer of α-aromatic substituted α-methylalkene. ### Claim 17 (depends on 10) The power cable according to claim 10, wherein the fatty acid amide is a fatty acid monoamide. ### Claim 18 (depends on 10) The power cable according to claim 10, wherein the fatty acid amide is an unsaturated fatty acid amide. ### Claim 19 (depends on 1) The electrical insulation composition according to claim 1, wherein the base resin has crosslinking points which do not contain silicon atoms. ### Claim 20 (depends on 10) The power cable according to claim 10, wherein the base resin has crosslinking points which do not contain silicon atoms. ### Claim 21 (depends on 1) The electrical insulation composition according to claim 1, wherein the styrene-based thermoplastic elastomer is selected from the group consisting of a styrene-butadiene-styrene block copolymer, a hydrogenated styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene copolymer, a hydrogenated styrene-isoprene-styrene copolymer, a hydrogenated styrene-butadiene rubber, a hydrogenated styrene-isoprene rubber, a styrene-ethylene-butylene-olefin crystal block copolymer, and mixtures thereof. ### Claim 22 (depends on 10) The power cable according to claim 10, wherein the styrene-based thermoplastic elastomer is selected from the group consisting of a styrene-butadiene-styrene block copolymer, a hydrogenated styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene copolymer, a hydrogenated styrene-isoprene-styrene copolymer, a hydrogenated styrene-butadiene rubber, a hydrogenated styrene-isoprene rubber, a styrene-ethylene-butylene-olefin crystal block copolymer, and mixtures thereof.