The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 2025
Filed:
Jun. 20, 2023
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Kazuchika Sugahara, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe, JP;
Abstract
Provided is a tire with a tread portion having a circumferential groove communicating in the circumferential direction, wherein the cap rubber layer forming the tread portion is formed from a rubber composition which contains 40 parts by mass or more and 80 parts by mass or less of styrene-butadiene rubber (SBR) having a styrene content of 25% by mass or less, and 60 parts by mass or more of a filler with respect to 100 parts by mass of the rubber component, and has a loss tangent 10° C. tan δ of less than 0.28, and a glass transition temperature Tg (° C.) of −40° C. or lower; and the glass transition temperature Tg (° C.) and the depth G (mm) of the circumferential groove satisfy Tg≤−0.5×G−35; and an object of the present invention is to improve off-road performance of a tire.