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:
Oct. 17, 2006
Filed:
Jun. 27, 2003
Isamu Tsumori, Kobe, JP;
Akira Minakoshi, Kobe, JP;
Naohiko Kikuchi, Kobe, JP;
Yoshikazu Tanaka, Kobe, JP;
Takuzo Iwata, Kobe, JP;
Norio Taniguchi, Kobe, JP;
Isamu Tsumori, Kobe, JP;
Akira Minakoshi, Kobe, JP;
Naohiko Kikuchi, Kobe, JP;
Yoshikazu Tanaka, Kobe, JP;
Takuzo Iwata, Kobe, JP;
Norio Taniguchi, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Abstract
The present invention provides a studless tire excellent in performance on ice and snow in which digging friction is improved without losing adhesion friction. The studless tire has a tread comprising specific short fiber or plate-like material dispersed in diene rubber so as to be oriented in the tread thickness direction, wherein when measured at 25° C. the tread has a complex elastic modulus E1 in the tread thickness direction, and the sheet has a complex elastic modulus Eα in the extrusion direction and a complex elastic modulus Eβ in a 90° direction from the extrusion direction, when the rubber composition is made into 2 mm sheets with a roller and these moduli fulfill the following equation,60≦(1−β)/()×100≦100and the tread has a specific tread rubber hardness. The tire is obtained using a tread prepared by extruding a rubber composition containing diene rubber and specific short fiber or plate-type material in a tube shape, thereby orienting the short fiber in the circumferential direction of the tube shaped rubber, then cutting the obtained rubber sheet parallel to the extrusion direction, rotating each piece 90° and laminating.