# US 10,766,305 B2 · Pneumatic tire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,766,305 B2 - Document ID: US10766305B2 - Status: Granted - Kind: B2 - Application number: 15/532,435 - Filed: 2015-11-17 - Published: 2017-09-21 - Granted: 2020-09-08 - Earliest claimed: 2014-12-16 - Assignees: Sumitomo Rubber Industries, Ltd. - Applicants: Sumitomo Rubber Industries, Ltd. - Inventors: Tetsuya Kunisawa - Web page: https://patentgrep.com/patent/US10766305B2 ## CPC - B60C 1/0016: {Compositions of the tread} - B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition - B60C 11/00: Tyre tread bands; Tread patterns; Anti-skid inserts - C08K 3/36: Silica - C08L 9/06: Copolymers with styrene - C08L 21/00: Compositions of unspecified rubbers - B60C 2011/0025: {Modulus or tan delta} - B60C 2200/04: for road vehicles, e.g. passenger cars - 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) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract The present invention provides a pneumatic tire that achieves a balanced improvement in fuel economy, wet grip performance, handling stability, abrasion resistance, fatigue resistance, and tensile strength. The present invention relates to a pneumatic tire including a tread formed from a rubber composition, the rubber composition having after vulcanization rubber properties satisfying certain values. ## Claims ### Claim 1 A pneumatic tire, comprising a tread formed from a rubber composition, the rubber composition including an aromatic petroleum resin, the rubber composition including a quinoline antioxidant and a p-phenylenediamine antioxidant, and the rubber composition having after vulcanization rubber properties satisfying all the following relations (1) to (7): (tan δ1/tan δ2)≥4.38 (1) (E*/tan δ2)≥21.88 (2) 3.5≤E*≤6.0 (3) tan δ2≤0.16 (4) tan δ1≥0.70 (5) EB≥600 (6) TB×EB≥12000 (7) where tan δ1 in relations (1) and (5) represents a tan δ at 0° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 5%; tan δ2 in relations (1), (2), and (4) represents a tan δ at 30° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 2%; E* in relations (2) and (3) represents a dynamic elastic modulus (E* (MPa)) at 30° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 2%; EB in relations (6) and (7) represents a tensile elongation (EB (%)) determined in accordance with JIS K 6251; and TB in relation (7) represents a tensile strength at break (TB (MPa)) determined in accordance with JIS K 6251. ### Claim 2 (depends on 1) The pneumatic tire according to claim 1, wherein the rubber properties after vulcanization of the rubber composition further satisfy the following relation (8): 57≤Hs≤67 (8) where Hs represents a hardness (Hs) at 23° C. determined in accordance with JIS K 6253. ### Claim 3 (depends on 1) The pneumatic tire according to claim 1, wherein the rubber composition includes a styrene-butadiene rubber modified by a compound represented by formula (I): wherein R11, R12, and R13 are the same as or different from one another and each represent an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group, a mercapto group, or a derivative thereof; R14 and R15 are the same as or different from one another and each represent a hydrogen atom or an alkyl group; and n represents an integer. ### Claim 4 (depends on 3) The pneumatic tire according to claim 3, wherein the modified styrene-butadiene rubber has a vinyl content of 10 to 90% by mass. ### Claim 5 (depends on 3) The pneumatic tire according to claim 3, wherein the modified styrene-butadiene rubber has a styrene content of 5 to 70% by mass. ### Claim 6 (depends on 3) The pneumatic tire according to claim 3, wherein the modified styrene-butadiene rubber has a glass transition temperature of −45 to 10° C. ### Claim 7 (depends on 3) The pneumatic tire according to claim 3, wherein an amount of the modified styrene-butadiene rubber is 70 to 95% by mass based on 100% by mass of a rubber component. ### Claim 8 (depends on 1) The pneumatic tire according to claim 1, wherein the rubber composition includes aluminum hydroxide. ### Claim 9 (depends on 8) The pneumatic tire according to claim 8, wherein the aluminum hydroxide has an average particle size of 0.05 to 10 μm. ### Claim 10 (depends on 8) The pneumatic tire according to claim 8, wherein an amount of the aluminum hydroxide is 1 to 75 parts by mass per 100 parts by mass of a rubber component. ### Claim 11 (depends on 8) The pneumatic tire according to claim 8, wherein the rubber composition further includes silica, wherein a mass ratio of the aluminum hydroxide to the silica is 0.01 to 0.28. ### Claim 12 (depends on 1) The pneumatic tire according to claim 1, wherein the aromatic petroleum resin has a softening point of 70 to 140° C. ### Claim 13 (depends on 1) The pneumatic tire according to claim 1, wherein the aromatic petroleum resin has a weight average molecular weight of 500 to 3000. ### Claim 14 (depends on 1) The pneumatic tire according to claim 1, wherein an amount of the aromatic petroleum resin is 2 to 25 parts by mass per 100 parts by mass of a rubber component. ### Claim 15 (depends on 1) The pneumatic tire according to claim 1, wherein the rubber composition includes a sulfenamide vulcanization accelerator and a guanidine vulcanization accelerator. ### Claim 16 (depends on 15) The pneumatic tire according to claim 15, wherein a combined amount of the sulfenamide vulcanization accelerator and the guanidine vulcanization accelerator is 1 to 10 parts by mass per 100 parts by mass of a rubber component. ### Claim 17 A pneumatic tire, comprising a tread formed from a rubber composition, the rubber composition including a quinoline antioxidant and a p-phenylenediamine antioxidant, and the rubber composition having after vulcanization rubber properties satisfying all the following relations (1) to (7): (tan δ1/tan δ2)≥4.38 (1) (E*/tan δ2)≥21.88 (2) 3.5≤E*≤6.0 (3) tan δ2≤0.16 (4) tan δ1≥0.70 (5) EB≥600 (6) TB×EB≥12000 (7) where tan δ1 in relations (1) and (5) represents a tan δ at 0° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 5%; tan δ2 in relations (1), (2), and (4) represents a tan δ at 30° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 2%; E* in relations (2) and (3) represents a dynamic elastic modulus (E* (MPa)) at 30° C. determined by viscoelastic measurement at an initial strain of 10% and a dynamic strain of 2%; EB in relations (6) and (7) represents a tensile elongation (EB (%)) determined in accordance with JIS K 6251; and TB in relation (7) represents a tensile strength at break (TB (MPa)) determined in accordance with JIS K 6251. ### Claim 18 (depends on 17) The pneumatic tire according to claim 17, wherein a combined amount of the quinoline antioxidant and the p-phenylenediamine antioxidant is 1 to 10 parts by mass per 100 parts by mass of a rubber component.