# US 10,870,759 B2 · Silicone rubber composition for waterproofing, silicone rubber molded body for waterproofing, and wire harness > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,759 B2 - Document ID: US10870759B2 - Status: Granted - Kind: B2 - Application number: 16/097,956 - Filed: 2017-05-11 - Published: 2019-05-16 - Granted: 2020-12-22 - Earliest claimed: 2016-05-19 - 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: Takaaki Hamaguchi - Web page: https://patentgrep.com/patent/US10870759B2 ## CPC - C08L 83/04: Polysiloxanes - H01B 3/28: natural or synthetic rubbers - C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)} - C09K 3/10: {Materials in mouldable or extrudable form} for sealing or packing joints or covers (filling pastes C09D5/34) - H01B 7/00: Insulated conductors or cables characterised by their form - H01B 7/282: Preventing penetration of fluid {, e.g. water or humidity,} into conductor or cable - C08L 2203/202: use in electrical wires or wirecoating - Y02A 30/14: Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - 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) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE ## Abstract A silicone rubber composition for waterproofing which is capable of maintaining waterproofing performance even if flexing and bending occur; a silicone rubber molded body for waterproofing; and a wire harness. This silicone rubber composition for waterproofing includes a thermosetting silicone rubber, has a Shore A hardness of not more than 25 after being cured, and has breaking strength of at least 5.0 MPa after being cured. The silicone rubber composition for waterproofing is used in a waterproofing part of a wire harness. It is preferable that a vinyl group-containing compound be included in addition to the thermosetting silicone rubber. A vinyl group-containing compound may be a monofunctional vinyl group-containing compound. ## Claims ### Claim 1 A silicone rubber composition for waterproofing configured to be used in a waterproofing part of a wire harness, the silicone rubber composition for waterproofing containing: a vinyl group-containing compound, and a thermosetting silicone rubber, the silicone rubber composition having a Shore A hardness of not more than 20 after being cured and a breaking strength of at least 7.5 MPa but not more than 10.5 MPa after being cured, wherein a molar ratio (a:b) between a vinyl group (a) of the vinyl group-containing compound and a hydrosilyl group (b) in the thermosetting silicone rubber is in a range between 10:1 and 0.2:1. ### Claim 2 (depends on 1) The silicone rubber composition for waterproofing according to claim 1, wherein the vinyl group-containing compound is a monofunctional vinyl group-containing compound. ### Claim 3 (depends on 2) The silicone rubber composition for waterproofing according to claim 2, wherein the vinyl group-containing compound is a 1-alkene. ### Claim 4 (depends on 3) A silicone rubber molded body for waterproofing configured by a cured product of the silicone rubber composition for waterproofing according to claim 3. ### Claim 5 (depends on 4) A wire harness comprising a waterproofing part, wherein the silicone rubber molded body for waterproofing according to claim 4 is disposed in the waterproofing part. ### Claim 6 (depends on 2) A silicone rubber molded body for waterproofing configured by a cured product of the silicone rubber composition for waterproofing according to claim 2. ### Claim 7 (depends on 1) A silicone rubber molded body for waterproofing configured by a cured product of the silicone rubber composition for waterproofing according to claim 1. ### Claim 8 A wire harness comprising a waterproofing part, wherein a silicone rubber molded body for waterproofing is disposed in the waterproofing part; the silicone rubber molded body for waterproofing configured by a cured product of a silicone rubber composition for waterproofing, the silicone rubber composition for waterproofing containing: a vinyl group-containing compound, the vinyl group-containing compound being a monofunctional vinyl group-containing compound, and a thermosetting silicone rubber, the silicone rubber composition having a Shore A hardness of not more than 25 after being cured and a breaking strength of at least 7.5 MPa but not more than 10.5 MPa after being cured, wherein a molar ratio (a:b) between a vinyl group (a) of the vinyl group-containing compound and a hydrosilyl group (b) in the thermosetting silicone rubber is in a range between 10:1 and 0.2:1. ### Claim 9 A wire harness comprising a waterproofing part, wherein a silicone rubber molded body for waterproofing is disposed in the waterproofing part; the silicone rubber molded body for waterproofing configured by a cured product of a silicone rubber composition for waterproofing, the silicone rubber composition for waterproofing containing: a vinyl group-containing compound, and a thermosetting silicone rubber, the silicone rubber composition having a Shore A hardness of not more than 25 after being cured and a breaking strength of at least 7.5 MPa but not more than 10.5 MPa after being cured, wherein a molar ratio (a:b) between a vinyl group (a) of the vinyl group-containing compound and a hydrosilyl group (b) in the thermosetting silicone rubber is in a range between 10:1 and 0.2:1.