C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 7/00 (2006.01) B60C 1/00 (2006.01) C08L 21/00 (2006.01)
Patent
CA 2070570
A pneumatic tire comprising a rubber composition used for a tread. The rubber composition includes a rubber component and particulates of a crystalline syndiotactic-1,2-polybutadiene resin. The particulates have an average particle diameter of 1 to 500 µm and a melting point of said crystalline syndiotactic-1,2- polybutadiene resin is not less than 110°C. A compound- ing ratio of the resin being 5 to 60 parts by weight relative to 100 parts by weight of the rubber composi- tion. A matrix portion of the tread rubber other than the above particulates is preferably a foamed rubber. The particulates may be resin-composite particulates composed of the crystalline syndiotactic-1,2- polybutadiene resin having the melting point of not less than 110°C and a carbon black, wherein a compounding ratio of the resin-composite particulates is 5 to 60 parts by weight relative to 100 parts by weight of the rubber component, and the resin and the carbon black satisfy the following inequalities: 250 < X + 10 Y < 1300 in which X is a nitrogen-adsorption specific surface area (unit: m2/g) and Y is the compounding ratio of the carbon black (parts by weight) relative to 100 parts by weight of the resin.
Aoyama Masanori
Hamada Tatsuro
Iwafune Seiichiro
Morimoto Yoshiyuki
Yamanaka Eiji
Bridgestone Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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