# US 2020/0399449 A1 · Ply coat rubber composition and a tire comprising a ply 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 2020/0399449 A1 - Document ID: US20200399449A1 - Status: Published application - Kind: A1 - Application number: 16/904,034 - 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: Carolin Anna Welter; Jean-Claude Knepper; Marc-André Paulus; Betul Buehler; Dawn Michelle Johnson; Philippe Schmit; Vaibhav Nawale - Web page: https://patentgrep.com/patent/US20200399449A1 ## 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) - B29D 30/40: Chemical pretreatment of textile inserts before building the tyre - B60C 1/0041: {Compositions of the carcass layers} - B60C 9/0007: {Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal} - B60C 9/2009: {comprising plies of different materials} - C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons - B60C 2001/0066: {Compositions of the belt layers} - B60C 2001/0083: {Compositions of the cap ply layers} - B60C 2009/0021: {Coating rubbers for steel cords} - 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 ply coat rubber composition for a tire ply comprises from 60 phr to 90 phr of natural rubber, from 10 phr to 40 phr of synthetic polyisoprene, from 30 phr to 80 phr of pre-silanized and precipitated silica, from 0.1 phr to 5 phr of a cobalt salt, up to 15 phr of carbon black, up to 5 phr of resin, and up to 8 phr of oil. Moreover, the invention is directed to a tire comprising such a rubber composition. ## Claims ### Claim 1 A ply coat rubber composition comprising: 60 phr to 100 phr of natural rubber, up to 40 phr of synthetic polyisoprene, 30 phr to 80 phr of pre-silanized precipitated silica, 0.1 phr to 5 phr of a cobalt salt, up to 15 phr of carbon black, up to 5 phr of a resin, and up to 8 phr of oil. ### Claim 2 (depends on 1) The ply rubber composition of claim 1 wherein the natural rubber is present at a level which is within the range of 70 phr to 80 phr, wherein the synthetic polyisoprene is present at a level which is within the range of 20 phr to 30 phr, wherein the pre-silanized precipitated silica is present at a level which is within the range of 50 phr to 60 phr, and wherein the carbon black is present at a level which is within the range of 2 phr to 10 phr. ### Claim 3 (depends on 1) The ply 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 4 (depends on 1) The ply rubber composition of claim 1 wherein the ply rubber composition is further comprised of 1 phr to 20 phr of zinc oxide. ### Claim 5 (depends on 1) The ply rubber composition of claim 1 wherein the ply rubber composition is further comprised of 1 to 15 phr of sulfur. ### Claim 6 (depends on 1) The ply rubber composition of claim 1 wherein the ply rubber composition is essentially resin free. ### Claim 7 (depends on 1) The ply rubber composition of claim 1 wherein the amount of resin in the ply rubber composition is less than 2 phr. ### Claim 8 (depends on 1) The ply 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 9 (depends on 1) The ply rubber composition of claim 1 wherein said pre-silanized precipitated silica is precipitated silica pre-reacted with a sulfur-containing silane which is comprised of bis(3-triethoxysilylpropyl)polysulfide containing an average of from 2 to 5 connecting sulfur atoms in its polysulfidic bridge, or an alkoxyorganomercaptosilane. ### Claim 10 (depends on 1) The ply rubber composition of claim 1 wherein said pre-silanized precipitated silica has mercapto groups at its surface at a level which is within the range of 0.1 weight percent to 1 weight percent. ### Claim 11 (depends on 10) The ply rubber composition of claim 10 wherein the pre-silanized precipitated silica is pre-reacted with a silica coupler comprising an alkoxyorganomercaptosilane. ### Claim 12 (depends on 1) The ply rubber composition of claim 1, wherein the surface of said pre-silanized precipitated silica is pre-hydrophobated with a hydrocarbon chain material having at least 4 carbon atoms along its chain. ### Claim 13 (depends on 1) The ply rubber composition of claim 1, wherein the pre-silanized precipitated silica has a hydrocarbon chain material on its surface, and wherein the carbon on the surface of the pre-silanized precipitated silica is present at a level which is within the range of 3 weight percent to 8 weight percent. ### Claim 14 (depends on 1) The ply rubber composition of claim 1 which is further comprised of an additional silica coupling agent wherein the phr ratio of said pre-silanized precipitated silica to the silica coupling agent is between 5:1 and 30:1. ### Claim 15 (depends on 1) The ply rubber composition of claim 1 wherein the ply rubber composition contains less than 5 phr of oil. ### Claim 16 (depends on 1) The ply rubber composition of claim 1 wherein the ply rubber composition is essentially free of polyethylene glycol. ### Claim 17 (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 a belt ply, a carcass ply, an overlay ply, or a ply strip which is comprised of the ply rubber composition of claim 1. ### Claim 18 (depends on 17) The tire of claim 17 wherein the belt ply, the carcass ply, the overlay ply or the ply strip has a textile which is calendered on both sides with the rubber composition. ### Claim 19 (depends on 17) The tire of claim 17 wherein the belt ply, the carcass ply, the overlay ply, or the ply strip is comprised of a plurality of essentially parallelly extending metal wires which are coated with the ply rubber composition. ### Claim 20 (depends on 17) The tire of claim 17 wherein the plurality of parallelly extending metal wires define a plane of parallelly extending metal wires which are calendered on both sides with the rubber composition.