# US 2020/0403340 A1 · Water repellent agent, water-repellent treated material, electrical connection structure, 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 2020/0403340 A1 - Document ID: US20200403340A1 - Status: Published application - Kind: A1 - Application number: 16/892,455 - Filed: 2020-06-04 - Published: 2020-12-24 - Earliest claimed: 2019-06-20 - Assignees: Autonetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd.; Kyushu University, National University Corporation - Applicants: Autonetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd.; Kyushu University, National University Corporation - Inventors: Naoyuki OSHIUMI; Takehiro HOSOKAWA; Makoto MIZOGUCHI - Web page: https://patentgrep.com/patent/US20200403340A1 ## CPC - H01R 13/03: characterised by the material, e.g. plating, or coating materials - H01R 13/5216: {characterised by the sealing material, e.g. gels or resins} - C08L 23/26: modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876) - C08L 25/06: Polystyrene - C08L 25/10: with conjugated dienes - C08L 27/06: Homopolymers or copolymers of vinyl chloride - C08L 33/12: Homopolymers or copolymers of methyl methacrylate - C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates - C09D 127/06: Homopolymers or copolymers of vinyl chloride - C09D 133/12: Homopolymers or copolymers of methyl methacrylate - H01B 7/0045: {Cable-harnesses} - H01R 13/533: Bases, cases made for use in extreme conditions, e.g. high temperature, radiation, vibration, corrosive environment, pressure (H01R13/52 takes precedence) - C08K 2201/005: Additives being defined by their particle size in general - C08L 2207/04: Thermoplastic elastomer - H01R 4/185: {combined with a U-shaped insulation-receiving portion} - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - 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) ## Abstract A water repellent agent is provided that can easily form a water repellent layer that shows high water repellency and has high thermal resistance even without a material containing fluorine atoms, as well as a water-repellent treated material, an electrical connection structure, and a wire harness which have water repellent layers formed of the water repellent agent. The water repellent agent contains hydrophobized silica particles as component A, a resin having a glass transition temperature of 100° C. or higher as component B, an acid-modified resin as component C, and an organic solvent as component D. The water repellent agent has a mass ratio B:C of the component B and the component C in the range of 95:5 to 50:50. ## Claims ### Claim 1 A water repellent agent comprising: hydrophobized silica particles as component A; a resin having a glass transition temperature of 100° C. or higher as component B; an acid-modified resin as component C; and an organic solvent as component D, having a mass ratio B:C of the component B and the component C in the range of 95:5 to 50:50. ### Claim 2 (depends on 1) The water repellent agent according to claim 1, wherein the component C contains an acid-modified elastomer. ### Claim 3 (depends on 1) The water repellent agent according to claim 1, wherein the component C is a maleic acid-modified resin. ### Claim 4 (depends on 1) The water repellent agent according to claim 1, wherein silica particles constituting the component A has an average particle size of 100 nm or smaller. ### Claim 5 (depends on 1) The water repellent agent according to claim 1, wherein a content of the component A is 0.1% or more and 10% or less by mass. ### Claim 6 (depends on 1) The water repellent agent according to claim 1, wherein a mass ratio A:(B+C) between the component A and a sum of the component B and the component C is in the range of 90:10 to 30:70. ### Claim 7 (depends on 1) The water repellent agent according to claim 1, wherein the water repellent agent does not comprise a material containing fluorine atoms. ### Claim 8 (depends on 1) The water repellent agent according to claim 1, wherein the water repellent agent does not comprise an alkoxysilane. ### Claim 9 (depends on 1) The water repellent agent according to claim 1, wherein the organic solvent as the component D has a boiling point of 150° C. or lower. ### Claim 10 (depends on 1) A water-repellent treated material having: a base material; and a water repellent layer formed of the water repellent agent according to claim 1 covering a surface of the base material. ### Claim 11 (depends on 10) The water-repellent treated material according to claim 10, wherein the component D has been evaporated from the water repellent layer. ### Claim 12 (depends on 10) The water-repellent treated material according to claim 10, wherein the base material comprises a resin or metal material at the surface thereof. ### Claim 13 (depends on 10) An electrical connection structure comprising the water-repellent treated material according to claim 10, wherein the structure can form electrical connection with another electrical connection member. ### Claim 14 (depends on 13) The electrical connection structure according to claim 13, wherein the structure is configured as a connector comprising: a connecting terminal comprising a metal material at a surface thereof; and a connector housing accommodating the connecting terminal and comprising a resin material at a surface thereof, the connector comprising the water repellent layer on at least one selected from the group consisting of the surface of the metal material of the connecting terminal and the surface of the resin material of the connector housing. ### Claim 15 (depends on 13) A wire harness comprising the electrical connection structure according to claim 13.