The Yokohama Rubber Co., Ltd.

Ryutaro Nakagawa

Yusuke Tanabe

Hiroki Sugiura

A rubber composition for a tire tread contains a diene rubber, silica, and a cured product; a content of the silica being from 20 to 100 parts by mass per 100 parts by mass of the diene rubber, a content of the cured product being from 0.3 to 30 parts by mass per 100 parts by mass of the diene rubber; the diene rubber containing a natural rubber and a modified butadiene rubber having a polyorganosiloxane group at a terminal, a content of the natural rubber in the diene rubber being from 30 to 90 mass %, a content of the modified butadiene rubber in the diene rubber being from 10 to 70 mass %; the cured product being a cured product obtained by curing a crosslinkable oligomer or polymer that is incompatible with the diene rubber; and a JIS A hardness of the cured product being from 3 to 45.

Rubber composition for a tire tread and pneumatic tire using the same

The present technology provides a rubber composition for sidewalls containing, a diene rubber, from 10 to 120 parts by mass of a carbon black, and from 3 to 30 parts by mass of an acid-modified polyolefin having a melting point of from 100 to 150&#xb0; C. per 100 parts by mass of the diene rubber, a main chain of the acid-modified polyolefin being a homopolymer of an olefin; and a pneumatic tire using the same in sidewalls thereof.

Rubber composition for sidewalls, and pneumatic tire using same

The present invention is to provide a polymer which has a C&#x2014;P bond. The present invention can provide a phosphoric acid-modified polymer having a double bond, and a phosphorus substituent containing a phosphorus atom that directly bonds to a carbon atom.

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Hiratsuka, Japan

Ryutaro Nakagawa