Bridgestone Corporation

Bridgestone Corportion

Hideki Komatsu

David F Lawson

Thomas A Antkowiak

John R Schreffler

Mark L Stayer, Jr

Tatsuo Fujimaki

Tatsuro Hamada

Hiromi Fukuoka

Noboru Oshima

Mitsuhiko Sakakibara

Fumio Tsutsumi

Akihiko Morikawa

A pneumatic tire comprises a tread, in which a rubber layer having a specific resistance of not more than 10 &OHgr;&middot;cm and a thickness of 0.1-1 mm forms a continuous layer extending in a circumferential direction of the tire while contacting with a surface portion of the tread having a specific resistance of not less than 10 &OHgr;&middot;cm and a part of at least one member adjacent thereto in a radial direction.

Pneumatic tire having electrically conductive rubber layer in land portion defined between circumferential grooves

A vulcanizable elastomeric compound and products such as pneumatic tires and the like, are formed from a functionalized polymer having a functional group derived from an anionic polymerization initiator. The anionic polymerization initiator comprises the general formula ##STR1## where R.sup.1 -R.sup.5 are the same or different and are selected from the group consisting of hydrogen; alkyls having from alkyls having from 1 to about 12 carbon atoms; aralkyls having from 7 to about 20 carbon atoms; dialkylaminos having from 2 to about 20 carbon atoms; and, dialkylaminoalkyls having from 3 to about 20 carbon atoms. At least one of R.sup.1 -R.sup.5 is selected from the group consisting of the dialkylaminos and the dialkylaminoalkyls. Methods of the present invention include preparing functionalized polymers and reducing the hysteresis of vulcanizable elastomeric compounds.

Functionalized polymer of improved hysteresis properties prepared using

Low-hysteresis elastomer compositions using amino-substituted

Amino-substituted aryllithium compounds as anionic polymerization

There is a tire having tire performances such as wear resistance, cut resistance, heat build-up and the like and a processability simultaneously and economically improved by the application of a rubber composition containing a rubbery polymer modified with a silane compound and silica. The rubbery polymer modified with the silane compound is obtained by reacting an active terminal of a living polymer, which is obtained by polymerizing a monomer in the presence of an organic alkali metal catalyst, with a silane compound represented by the following general formula:

Tires made of silica filled, silane modified rubber

A conjugated diene series rubber composition comprises, as a rubber component, (a) 20.about.100% by weight of a particular conjugated diene polymer and (b) a diene polymer rubber except for the polymer (a) and is excellent in the processability at unvulcanized state and the rebound resilience, strengths at rupture and wear resistance at vulcanized state.

Conjugated diene series rubber compositions

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Kodaira, Japan

Hideki Komatsu