US 12,215,230 B2
Tire
Takahiro Kawachi, Hyogo (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed by SUMITOMO RUBBER INDUSTRIES, LTD., Hyogo (JP)
Filed on May 26, 2021, as Appl. No. 17/330,816.
Claims priority of application No. 2020-104626 (JP), filed on Jun. 17, 2020.
Prior Publication US 2021/0395499 A1, Dec. 23, 2021
Int. Cl. C08L 9/06 (2006.01); B60C 1/00 (2006.01); B60C 11/00 (2006.01); C08L 7/00 (2006.01)
CPC C08L 9/06 (2013.01) [B60C 1/0016 (2013.01); B60C 11/0058 (2013.01); C08L 7/00 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01)] 16 Claims
OG exemplary drawing
 
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.