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. 21, 2012
Filed:
Aug. 07, 2009
Naohiko Kikuchi, Kobe, JP;
Ryoji Kojima, Kobe, JP;
Naohiko Kikuchi, Kobe, JP;
Ryoji Kojima, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe-shi, JP;
Abstract
The present invention provides a tread rubber composition for a studless tire having favorable performance on ice and snow and excellent abrasion resistance while reducing strain dependence of hardness of the tread rubber and maintaining rigidity on roads that are not covered with snow and relates to a tread rubber composition for a studless tire, which comprises a diene rubber containing, in a total amount of 80% by mass or more, natural rubber and polybutadiene rubber; silica in an amount of 10 to 150 parts by mass per 100 parts by mass of the diene rubber; and carbon black in an amount of 3 to 50 parts by mass per 100 parts by mass of the diene rubber, wherein the diene rubber contains 10% by mass or more of a polybutadiene rubber modified by a compound represented by the formula (I): R, Rand Rbeing independently an alkyl group, analkoxy group, a silyloxy group, an acetal group, a carboxyl group, a mercapto group, or a derivative thereof; Rand Rbeing independently a hydrogen atom or an alkyl group; and n being an integer.