# US 2020/0399459 A1 · Composition for wire coating material, insulated wire, and wiring harness > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399459 A1 - Document ID: US20200399459A1 - Status: Published application - Kind: A1 - Application number: 16/976,815 - Filed: 2019-02-27 - Published: 2020-12-24 - Earliest claimed: 2018-03-20 - Assignees: Autonetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd. - Applicants: Autonetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd. - Inventors: Tatsuya SHIMADA - Web page: https://patentgrep.com/patent/US20200399459A1 ## CPC - C08F 255/02: on to polymers of olefins having two or three carbon atoms - C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond - C08F 287/00: Macromolecular compounds obtained by polymerising monomers on to block polymers - C08K 3/16: Halogen-containing compounds - C08K 3/2279: {of antimony} - C08L 23/00: Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers - C08L 23/02: not modified by chemical after-treatment - C08L 23/26: modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876) - H01B 3/44: vinyl resins; acrylic resins (silicones H01B3/46) - C08K 3/016: Flame-proofing or flame-retarding additives - C08K 5/0066: {Flame-proofing or flame-retarding additives} - C08K 5/03: aromatic {, e.g. C6H5-CH2-Cl} - C08K 2003/2224: {Magnesium hydroxide} - C08K 2003/2296: {of zinc} - C08K 2003/3009: {Sulfides} - C08L 2201/02: Flame or fire retardant/resistant - C08L 2203/202: use in electrical wires or wirecoating - C08L 2312/08: by silane - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - 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}) ## Abstract A composition for a wire coating material containing a silane-crosslinked polyolefin which is excellent in flame-retardancy, fusion resistance, and heat-deformation resistance, and an insulated wire and a wiring harness coating the composition. A composition for a wire coating material contains (A) a silane-grafted polyolefin which is a polyolefin graft-modified with a silane coupling agent, (B) an unmodified polyolefin, (C) a modified polyolefin having one or more functional groups selected from the group consisting of a carboxy group, an ester group, an acid anhydride group, an amino group, and an epoxy group, (D) a flame retardant, and (E) a crosslinking catalyst. The polyolefin of (A) the silane-grafted polyolefin has a density of 0.855 to 0.890 g/cm3 in an ungrafted state and has a melting point of 80° C. or higher, and the unmodified polyolefin has a density of 0.855 to 0.950 g/cm3. ## Claims ### Claim 1 A composition for a wire coating material comprising: (A) a silane-grafted polyolefin which is a polyolefin graft-modified with a silane coupling agent; (B) an unmodified polyolefin; (C) a modified polyolefin having one or more functional groups selected from the group consisting of a carboxy group, an ester group, an acid anhydride group, an amino group, and an epoxy group; (D) a flame retardant; and (E) a crosslinking catalyst, the polyolefin of (A) the silane-grafted polyolefin having a density of 0.855 to 0.890 g/cm3 in an ungrafted state and having a melting point of 80° C. or higher, the unmodified polyolefin having a density of 0.855 to 0.950 g/cm3. ### Claim 2 (depends on 1) The composition according to claim 1, wherein the polyolefin of (A) the silane-grafted polyolefin in the ungrafted state has a density of 0.865 to 0.880 g/cm3, a melt flow rate of 0.5 to 5 g/10 min. at 190° C. under a load of 2.16 kg, a Shore A hardness of 55 to 70, a flexural modulus of 3 to 50 MPa, and a melting point of 100° C. or higher, and (B) the unmodified polyolefin has a melt flow rate of 0.5 to 5 g/10 min. at 190° C. under a load of 2.16 kg, a flexural modulus of 3 to 200 MPa, and a melting point of 65° C. or higher. ### Claim 3 (depends on 1) The composition according to claim 1, wherein the amount of (A) the silane-grafted polyolefin is 30 to 90 parts by mass, the total amount of (B) the unmodified polyolefin and (C) the modified polyolefin is 10 to 70 parts by mass, (D) the flame retardant comprises with respect to 100 parts by mass of the total amount of the components (A), (B), and (C), at least either one of: (D-1) 10 to 100 parts by mass of a metal hydroxide; and (D-2) 10 to 40 parts by mass of a bromine flame retardant and 5 to 20 parts by mass of an antimony trioxide, and the amount of component (E) the crosslinking catalyst is 0.01 to 1 parts by mass with respect to 100 parts by mass of the total amount of the components (A), (B), and (C). ### Claim 4 (depends on 1) The composition according to claim 1, wherein the composition further comprises, with respect to the total amount of the components (A), (B), and (C): (F) 1 to 10 parts by mass of an antioxidant; (G) 1 to 10 parts by mass of a metal deactivator; and (H) 1 to 10 parts by mass of a lubricant ### Claim 5 (depends on 1) The composition according to claim 1, wherein either one of: (1-1) 1 to 15 parts by mass of a zinc oxide and 1 to 15 parts by mass of an imidazole compound; and (1-2) 1 to 15 parts by mass of a zinc sulfide ### Claim 6 (depends on 1) The composition according to claim 1, wherein each of the polyolefin consisting (A) the silane-grafted polyolefin and (B) the unmodified polyolefin is one or more each selected from the group consisting of an ultra-low-density polyethylene, a linear-low-density polyethylene, and low-density polyethylene. ### Claim 7 (depends on 1) The composition according to claim 1, wherein (D) the flame retardant comprises both a metal hydroxide and a bromine flame retardant. ### Claim 8 (depends on 1) An insulated wire, comprising an electric wire coating material comprising a crosslinked product of the composition for a wire coating material according to claim 1. ### Claim 9 (depends on 8) A wiring harness, comprising the insulated wire according to claim 8.