# US 11,441,018 B2 · Pneumatic tire having tread with three elastomers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,018 B2 - Document ID: US11441018B2 - Status: Granted - Kind: B2 - Application number: 16/568,313 - Filed: 2019-09-12 - Published: 2021-03-18 - Granted: 2022-09-13 - Earliest claimed: 2019-09-12 - Assignees: The Goodyear Tire & Rubber Company - Applicants: The Goodyear Tire & Rubber Company - Inventors: Jennifer Lyn Ryba; Philip Jordan Young - Web page: https://patentgrep.com/patent/US11441018B2 ## CPC - C08L 7/00: Compositions of natural rubber - B60C 1/0016: {Compositions of the tread} - C08K 3/36: Silica - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08L 2205/035: containing four or more polymers in a blend - C08L 2205/06: having improved processability or containing aids for moulding methods - C08L 2207/322: Liquid component is processing oil - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract The present invention is directed to a pneumatic tire comprising a vulcanizable rubber composition, the vulcanization rubber composition comprising: 1) 100 parts by weight of elastomer consisting of 25 to 35 phr of a styrene-butadiene rubber, 25 to 35 phr of a polybutadiene, and 35 to 45 phr of a natural rubber or synthetic polyisoprene, wherein the styrene-butadiene rubber is a functionalized solution polymerized styrene-butadiene elastomer having a glass transition temperature Tg(A) ranging from −30 to −10° C. and having at least one functional group; the natural rubber or synthetic polyisoprene has a Tg(B) ranging from −60 to −70° C.; and the polybutadiene is a cis 1,4 polybutadiene having a Tg(C) ranging from −110 to −90° C., wherein Tg(A)−Tg(B)≥25° C., and Tg(B)−Tg(C)≥25° C.; 2) 60 to 80 phr of a prehydrophobated silica; 3) 1 to 10 phr of carbon black; 4) 1 to 3 phr of rubber processing oil; and 5) 5 to 25 phr of at least one hydrocarbon resin having a Tg≥20° C., wherein the weight ratio of hydrocarbon resin to rubber processing oil is greater than 8. ## Claims ### Claim 1 A pneumatic tire comprising a vulcanizable rubber composition, the vulcanization rubber composition comprising: 1) 100 parts by weight of elastomer consisting of 25 to 35 phr of a styrene-butadiene rubber, 25 to 35 phr of a polybutadiene, and 35 to 45 phr of a natural rubber or synthetic polyisoprene, wherein the styrene-butadiene rubber is a functionalized solution polymerized styrene-butadiene elastomer having a glass transition temperature Tg(A) ranging from −30 to −10° C. and having at least one functional group; the natural rubber or synthetic polyisoprene has a Tg(B) ranging from −60 to −70° C.; and the polybutadiene is a cis 1,4 polybutadiene having a Tg(C) ranging from −110 to −90° C., wherein Tg(A)−Tg(B)≥25° C., and Tg(B)−Tg(C)≥25° C.; 2) 60 to 80 phr of a prehydrophobated silica; 3) 1 to 10 phr of carbon black; 4) 1 to 3 phr of rubber processing oil; and 5) 5 to 25 phr of at least one hydrocarbon resin having a Tg≥20° C.; wherein the weight ratio of hydrocarbon resin to rubber processing oil is greater than 8. 6) wherein the rubber composition excludes a free silane coupling agent. ### Claim 2 (depends on 1) The pneumatic tire of claim 1, wherein the functional group comprises at least one of an amino group, a thiol ester group, an alkoxy group, a hydroxyl group, and a silyl group. ### Claim 3 (depends on 1) The pneumatic tire of claim 1, wherein the functional group includes an amino, an alkoxy, and a silyl group. ### Claim 4 (depends on 1) The pneumatic tire of claim 1 wherein the styrene-butadiene rubber comprises functional groups selected from the group consisting of terminal functional groups, in chain functional groups. ### Claim 5 (depends on 1) The pneumatic tire of claim 1, wherein the amount hydrocarbon resin ranges from 10 to 20 phr. ### Claim 6 (depends on 1) The pneumatic tire of claim 1, wherein the amount of carbon black ranges from 1 to 5 phr. ### Claim 7 (depends on 1) The pneumatic tire of claim 1, wherein the hydrocarbon resin comprises a copolymer of styrene and alphamethylstyrene. ### Claim 8 (depends on 1) The pneumatic tire of claim 1, wherein the weight ratio of hydrocarbon resin to oil is greater than 12. ### Claim 9 (depends on 1) The pneumatic tire of claim 1, wherein the prehydrophobated silica comprises an alkoxysilane and an organomercaptoalkoxysilane. ### Claim 10 A vulcanizable rubber composition comprising: 1) 100 parts by weight of elastomer consisting of 25 to 35 phr of a styrene-butadiene rubber, 25 to 35 phr of a polybutadiene, and 35 to 45 phr of a natural rubber or synthetic polyisoprene, wherein the styrene-butadiene rubber is a functionalized solution polymerized styrene-butadiene elastomer having a glass transition temperature Tg(A) ranging from −30 to −10° C. and having at least one functional group; the natural rubber or synthetic polyisoprene has a Tg(B) ranging from −60 to −70° C.; and the polybutadiene is a cis 1,4 polybutadiene having a Tg(C) ranging from −110 to −90° C., wherein Tg(A)−Tg(B)≥25° C., and Tg(B)−Tg(C)≥25° C.; 2) 60 to 80 phr of a prehydrophobated silica; 3) 1 to 10 phr of carbon black; 4) 1 to 3 phr of rubber processing oil; and 5) 5 to 25 phr of at least one hydrocarbon resin having a Tg≥20° C.; wherein the weight ratio of hydrocarbon resin to rubber processing oil is greater than 8; wherein the rubber composition excludes a free silane coupling agent. ### Claim 11 (depends on 10) The vulcanizable rubber composition of claim 10, wherein the functional group comprises at least one of an amino group, a thiol ester group, an alkoxy group, a hydroxyl group, and a silyl group. ### Claim 12 (depends on 10) The vulcanizable rubber composition of claim 10, wherein the functional group includes an amino, an alkoxy, and a silyl group. ### Claim 13 (depends on 10) The vulcanizable rubber composition of claim 10 wherein the styrene-butadiene rubber comprises functional groups selected from the group consisting of terminal functional groups, in chain functional groups. ### Claim 14 (depends on 10) The vulcanizable rubber composition of claim 10, wherein the amount hydrocarbon resin ranges from 10 to 20 phr. ### Claim 15 (depends on 10) The vulcanizable rubber composition of claim 10, wherein the amount of carbon black ranges from 1 to 5 phr. ### Claim 16 (depends on 10) The vulcanizable rubber composition of claim 10, wherein the hydrocarbon resin comprises a copolymer of styrene and alphamethylstyrene. ### Claim 17 (depends on 10) The vulcanizable rubber composition of claim 10, wherein the weight ratio of hydrocarbon resin to oil is greater than 12. ### Claim 18 (depends on 10) The vulcanizable rubber composition of claim 10, wherein the prehydrophobated silica comprises an alkoxysilane and an organomercaptoalkoxysilane. ### Claim 19 (depends on 10) The vulcanizable rubber composition of claim 10, in the form of at least one item selected from a tire tread, a shoe, a shoe sole, a vibration isolator, a transmission belt, a hose, a conveyor belt, and a track belt.