# US 2020/0399448 A1 · Wire coat rubber composition for a tire and a tire comprising a wire coat rubber composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399448 A1 - Document ID: US20200399448A1 - Status: Published application - Kind: A1 - Application number: 16/903,502 - Filed: 2020-06-17 - Published: 2020-12-24 - Earliest claimed: 2019-06-21 - Assignees: The Goodyear Tire & Rubber Company - Applicants: The Goodyear Tire & Rubber Company - Inventors: Julia Martine Francoise Claudine Tahon; Robert Anthony Bethea; James Joseph Golden; Carolin Anna Welter; Christian Jean-Marie Kaes - Web page: https://patentgrep.com/patent/US20200399448A1 ## CPC - C08L 7/00: Compositions of natural rubber - C09D 107/00: Coating compositions based on natural rubber - B29D 30/38: Textile inserts, e.g. cord or canvas layers, for tyres (making woven fabrics D03D); Treatment of inserts prior to building the tyre (pretreatment of inserts B29B15/00; manufacture of layers comprising fibrous parallel reinforcements of substantial or continuous length B29C70/20) - B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition - B60C 9/0007: {Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal} - B29D 2030/381: {the inserts incorporating reinforcing parallel cords; manufacture thereof} - B29D 2030/383: {Chemical treatment of the reinforcing elements, e.g. cords, wires and filamentary materials, to increase the adhesion to the rubber} - B60C 2001/0066: {Compositions of the belt layers} - B60C 2009/0021: {Coating rubbers for steel cords} - C08L 2203/202: use in electrical wires or wirecoating - C08L 2205/03: containing three or more polymers in a blend - 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) - B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00) - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES ## Abstract In accordance with the invention a wire coat rubber composition for a tire comprises from 70 phr to 100 phr of cis 1,4-polyisoprene rubber, from 0 phr to 30 phr of solution styrene butadiene rubber, from 65 phr to 95 phr pre-silanized precipitated silica, from 0.1 phr to 5 phr of a cobalt salt, up to 15 phr carbon black, up to 10 phr of a resin, and up to 10 phr oil. Further the present invention is directed to a tire comprising such a wire coat composition. ## Claims ### Claim 1 A wire coat rubber composition comprising: 70 phr to 100 phr of cis 1,4-polyisoprene rubber, up to 30 phr of solution styrene-butadiene rubber, 65 phr to 95 phr pre-silanized precipitated silica, 0.1 phr to 5 phr of a cobalt salt, up to 15 phr carbon black, up to 10 phr of a resin, and up to 10 phr oil. ### Claim 2 (depends on 1) The wire coat rubber composition of claim 1, wherein the cobalt salt is present at a level which is within the range of 0.2 phr to 2 phr. ### Claim 3 (depends on 1) The wire coat rubber composition of claim 1, further comprising from 1 to 20 phr zinc oxide. ### Claim 4 (depends on 1) The wire coat rubber composition of claim 1 further comprising from 1 to 15 phr sulfur. ### Claim 5 (depends on 1) The wire coat rubber composition of claim 1, wherein the level of resin in the composition is less than 5 phr. ### Claim 6 (depends on 1) The wire coat rubber composition of claim 1, wherein the pre-silanized precipitated silica has a CTAB adsorption surface area which is within the range of 130 m2/g to 210 m2/g. ### Claim 7 (depends on 1) The wire coat rubber composition of claim 1, wherein said pre-silanized precipitated silica is precipitated silica pre-reacted with a silica coupler comprised of bis(3-triethoxysilylpropyl)polysulfide containing an average of from 1 to 5 connecting sulfur atoms in its polysulfidic bridge or an alkoxyorganomercaptosilane. ### Claim 8 (depends on 1) The wire coat rubber composition of claim 1, wherein said pre-silanized precipitated silica is pre-hydrophobated with a hydrocarbon chain material with at least 4 carbon atoms along its chain length. ### Claim 9 (depends on 1) The wire coat rubber composition of claim 1, wherein the wire coat rubber composition contains less than 5 phr oil. ### Claim 10 (depends on 1) The wire coat rubber composition of claim 1, wherein the solution styrene-butadiene rubber is present at a level which is within the range of 10 phr to 25 phr; and wherein the solution styrene-butadiene rubber has a glass transition temperature which is within the range of −30° C. and −90° C. ### Claim 11 (depends on 10) The wire coat rubber composition of claim 10, wherein the solution styrene butadiene rubber has a glass transition temperature which is within the range of −50° C. and −70° C. and wherein the solution styrene-butadiene rubber is tin-coupled. ### Claim 12 (depends on 10) The wire coat rubber composition of claim 10, wherein the solution styrene-butadiene rubber is thio-functionalized. ### Claim 13 (depends on 10) The wire coat rubber composition of claim 10, wherein the solution styrene-butadiene rubber has a bound styrene content which is within the range of 10% to 20%, and a vinyl content which is within the range of 20% to 40%. ### Claim 14 (depends on 1) The wire coat rubber composition of claim 1 wherein the cis 1,4-polyisoprene rubber is present at a level which is within the range of 75 phr to 90 phr, wherein the solution styrene-butadiene rubber is present at a level which is within the range of 10 phr to 25 phr, and wherein the pre-silanized precipitated silica is present at a level which within the range of from 70 phr to 90 phr. ### Claim 15 (depends on 1) The wire coat rubber composition of claim 1 wherein the cis 1,4-polyisoprene rubber is present at a level which is within the range of 90 phr to 100 phr, wherein the pre-silanized precipitated silica is present at a level which is within the range of 70 phr to 90 phr, wherein the carbon black is present at a maximum level of 10 phr, and wherein the resin is present at a maximum level of 5 phr. ### Claim 16 (depends on 1) A pneumatic tire which is comprised of a generally toroidal-shaped carcass with an outer circumferential tread, two spaced beads, at least one reinforced ply extending from bead to bead, and sidewalls extending radially from and connecting said tread to said beads, wherein said tread is adapted to be ground-contacting, and wherein the tire further includes metal reinforcing wires which are embedded in the wire coat rubber composition of claim 1. ### Claim 17 (depends on 16) The pneumatic tire as specified in claim 16 wherein metal reinforcing wires are embedded in the reinforced ply which is comprised of a plurality of essentially metal wires which are spaced apart from one another and extend essentially in parallel to each other. ### Claim 18 (depends on 17) The pneumatic tire as specified in claim 17 wherein metal wires are calendared on both sides with the rubber composition. ### Claim 19 (depends on 16) The pneumatic tire of claim 16 wherein the metal reinforcing wires are embedded in ply strips. ### Claim 20 (depends on 17) The pneumatic tire of claim 17 wherein the wherein the pre-silanized precipitated silica has a CTAB adsorption surface area which is within the range of 130 m2/g to 210 m2/g; wherein said pre-silanized precipitated silica is precipitated silica pre-reacted with a silica coupler comprised of bis(3-triethoxysilylpropyl)polysulfide containing an average of from 1 to 5 connecting sulfur atoms in its polysulfidic bridge or an alkoxyorganomercaptosilane; wherein said pre-silanized precipitated silica is pre-hydrophobated with a hydrocarbon chain material with at least 4 carbon atoms along its chain length; and wherein the wire coat rubber composition contains less than 5 phr oil.