Sumitomo Rubber Industries Limited

Tokyo Institute of Technology

Shoko Nakahata

Toshikazu Takata

Takahiro Mabuchi

Kensuke Washizu

Toyokazu Tsutsuba

Yukari Tomisaki

Ayaka Kitaou

Naoyuki Miki

A rotaxane compound comprising one or more cyclic molecules and an axial molecule penetrating through inner holes of the cyclic molecules and having cap structures disposed lest the cyclic molecules should be detached, where one of the cyclic molecule and the axial molecule has one of a functional group being capable of reacting with silica and a functional group being capable of reacting with a carbon-carbon unsaturated bond, and the other of the cyclic molecule and the axial molecule has the other of the functional group being capable of reacting with silica and the functional group being capable of reacting with a carbon-carbon unsaturated bond.

Rotaxane compound

The present invention provides rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. Included is a rubber composition having a hardness that reversibly changes with water, satisfying the relationships (1) and (2) below, and having a stress at break of 8.0 MPa or more,Hardness when dry−Hardness when water-wet≥1  (1)wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition,0.90≤Volume when water-wet/Volume when dry≤1.01  (2)wherein each volume represents the volume at 25° C. of the rubber composition.

Rubber composition and tire

Growing community of inventors

Hyogo, Japan

Shoko Nakahata