# US 12,215,230 B2 · Tire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,230 B2 - Document ID: US12215230B2 - Status: Granted - Kind: B2 - Application number: 17/330,816 - Filed: 2021-05-26 - Published: 2021-12-23 - Granted: 2025-02-04 - Earliest claimed: 2020-06-17 - Assignees: Sumitomo Rubber Industries, Ltd. - Applicants: Sumitomo Rubber Industries, Ltd. - Inventors: Takahiro Kawachi - Web page: https://patentgrep.com/patent/US12215230B2 ## CPC - C08C 19/25: Incorporating silicon atoms into the molecule - C08L 9/06: Copolymers with styrene - B60C 1/0016: {Compositions of the tread} - B60C 11/005: {with cap and base layers} - B60C 11/0058: {with different cap rubber layers in the axial direction} - C08C 19/22: Incorporating nitrogen atoms into the molecule - C08L 7/00: Compositions of natural rubber - C08L 15/00: Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) - B60C 2011/0025: {Modulus or tan delta} - B60C 2011/0033: {Thickness of the tread} - B60C 2011/0355: {characterised by depth} - B60C 2011/0367: {characterised by depth} - C08F 236/06: Butadiene - 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 - C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS - 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 - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract The present invention provides a tire having a good balance of fuel efficiency, chipping resistance, and steering stability. ## Claims ### Claim 1 A tire comprising a tread, wherein the tread has land parts partitioned by a plurality of circumferential grooves, wherein at least one of the land parts comprises one or more lateral grooves having no opening to any of the circumferential grooves at both ends of the lateral groove, and a groove depth of the deepest part of the lateral groove is 80% or more of a thickness of the entire tread part, wherein a groove depth of the deepest part of the lateral groove is larger than a groove depth of the deepest part of the circumferential groove, wherein the tread has at least one rubber layer, wherein a first rubber layer constituting the tread surface is composed of a rubber composition comprising a rubber component, a filler, a silane coupling agent, and a thiuram-based vulcanization accelerator, wherein the rubber component constituting the first rubber layer comprises an isoprene-based rubber, a styrene-butadiene rubber, and a butadiene rubber, wherein the filler comprised in the rubber composition constituting the first rubber layer comprises silica, wherein the rubber composition constituting the first rubber layer comprises 60 parts by mass or more of the filler based on 100 parts by mass of the rubber component, and wherein a breaking energy measured after subjecting the rubber composition constituting the first rubber layer to thermal deterioration at 80° C. for 7 days is 1,000 or more. ### Claim 2 (depends on 1) The tire of claim 1, wherein the rubber composition constituting the first rubber layer comprises 65 parts by mass or more of the filler based on 100 parts by mass of the rubber component. ### Claim 3 (depends on 1) The tire of claim 1, wherein a content of silica in the filler comprised in the rubber composition constituting the first rubber layer is 30 to 95% by mass. ### Claim 4 (depends on 1) The tire of claim 1, wherein the rubber composition constituting the first rubber layer comprises 0.1 parts by mass or more of a thiuram-based vulcanization accelerator based on 100 parts by mass of the rubber component. ### Claim 5 (depends on 1) The tire of claim 1, wherein the rubber composition constituting the first rubber layer comprises 4.8 parts by mass or more of a silane coupling agent based on 100 parts by mass of the rubber component. ### Claim 6 (depends on 1) The tire of claim 1, wherein the silane coupling agent comprised in the rubber composition constituting the first rubber layer is a mercapto-based silane coupling agent. ### Claim 7 (depends on 1) The tire of claim 1, wherein the rubber component constituting the first rubber layer comprises 10 to 20% by mass of an isoprene-based rubber, 45 to 65% by mass of a styrene-butadiene rubber, and 25 to 35% by mass of a butadiene rubber. ### Claim 8 (depends on 1) The tire of claim 1, wherein the tread has a second rubber layer adjacent to inside in a radial direction of the first rubber layer, wherein the second rubber layer is composed of a rubber composition comprising a rubber component and carbon black, wherein the rubber component constituting the second rubber layer comprises an isoprene-based rubber, and wherein tan δ of the rubber composition constituting the first rubber layer at 70° C. is larger than tan δ of the rubber composition constituting the second rubber layer at 70° C. ### Claim 9 (depends on 1) The tire of claim 1, wherein the tread has a second rubber layer adjacent to inside in a radial direction of the first rubber layer, wherein the second rubber layer is composed of a rubber composition comprising a rubber component and carbon black, wherein the rubber component constituting the second rubber layer comprises an isoprene-based rubber, and wherein a complex elastic modulus of the rubber composition constituting the first rubber layer at 70° C. is larger than a complex elastic modulus of the rubber composition constituting the second rubber layer at 70° C. ### Claim 10 (depends on 9) The tire of claim 9, wherein the rubber component constituting the second rubber layer further comprises a butadiene rubber. ### Claim 11 (depends on 8) The tire of claim 8, wherein the deepest part of the groove bottom of the at least one circumferential groove is formed so as to be located more inside in the radial direction of the tire than the outermost part of the second rubber layer. ### Claim 12 (depends on 8) The tire of claim 8, wherein the rubber component constituting the second rubber layer further comprises a butadiene rubber. ### Claim 13 (depends on 1) The tire of claim 1, wherein the groove depth of the deepest part of the circumferential groove is 4.0 mm to 8.0 mm. ### Claim 14 (depends on 1) The tire of claim 1, wherein the groove depth of the deepest part of the circumferential groove is 50 to 80% of the thickness of the entire tread part, and the groove depth of the deepest part of the lateral groove is 85% or more of the thickness of the entire tread part. ### Claim 15 (depends on 1) The tire of claim 1, wherein the complex elastic modulus of the rubber composition constituting the first rubber layer at 70° C. is 8.5 to 15.0 MPa. ### Claim 16 (depends on 1) The tire of claim 1, wherein the rubber component constituting the first rubber layer comprises 15 to 40% by mass of an isoprene-based rubber.