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:
Aug. 04, 2015
Filed:
Dec. 10, 2014
Sumitomo Rubber Industries, Ltd., Kobe-shi, Hyogo, JP;
Toshifumi Haba, Kobe, JP;
Tatsuya Miyazaki, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-Shi, JP;
Abstract
Provided is a pneumatic tire including a bead apex and/or sidewall reinforcing layer, which achieves balanced improvements in high-hardness properties, elongation at break, and self-heating properties to provide good run-flat durability while maintaining good processability. The pneumatic tire includes a bead apex and/or sidewall reinforcing layer formed from a rubber composition, the composition containing a rubber component (A) and carbon black (B), the rubber component (A) containing, per 100% by mass thereof: 10-75% by mass of a modified butadiene rubber (A1) with a cis content of 50% by mass or less; 5-40% by mass of a polybutadiene rubber (A2) containing 1,2-syndiotactic polybutadiene crystals; and 10-40% by mass of a diene rubber (A3) different from (A1) and (A2), the composition containing 35-65 parts by mass of carbon black (B) per 100 parts by mass of rubber component (A), the carbon black (B) having a BET specific surface area of 18-50 m/g.