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:
Feb. 12, 2019
Filed:
Mar. 18, 2014
Sumitomo Rubber Industries, Ltd., Kobe-shi, Hyogo, JP;
Tatsuya Miyazaki, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-Shi, Hyogo, JP;
Abstract
Provided is a rubber composition for base tread which can improve steering stability, rolling resistance and durability without deteriorating extrusion processability, comprising 1.8 to 3.5 parts by mass of sulfur and 36 to 60 parts by mass of filler for reinforcement comprising not less than 7 parts by mass of silica based on 100 parts by mass of a rubber component comprising: (a) not less than 0% by mass and not more than 20% by mass of (a1) a polybutadiene rubber comprising 2.5 to 20% by mass of 1,2-syndiotactic polybutadiene crystal and/or (a2) a butadiene rubber synthesized with a rare earth containing catalyst; (b) more than 5% by mass and not more than 60% by mass of (b1) a predetermined tin-modified polybutadiene rubber and/or (b2) a modified butadiene rubber modified with a predetermined compound; and (c) 40 to 75% by mass of a diene rubber other than (a) and (b).