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    • 6. 发明申请
    • PNEUMATIC TIRE
    • 气动轮胎
    • US20100288406A1
    • 2010-11-18
    • US12810774
    • 2009-02-13
    • Takamasa KitamuraShigeki ItoKenichi KitanoTakeshi Inohara
    • Takamasa KitamuraShigeki ItoKenichi KitanoTakeshi Inohara
    • B60C11/00
    • C08L7/00B60C1/0016B60C11/14B60C2011/0025C08J9/32C08J2203/22C08J2307/00C08J2309/00C08K3/04C08K3/36C08K5/548C08K7/22C08K9/10C08L9/00C08L21/00C08L2666/08
    • Provided is a pneumatic tire whose frictional force on ice is improved by satisfactorily forming resin-encapsulated cells from heat-expandable microcapsules, even when a tread rubber contains silica. The tire is characterized in that: the tread rubber is made of a rubber composition containing 100 parts by weight of a diene rubber, 30 to 100 parts by weight of a reinforcing filler including at least 10 parts by weight of silica, and 1 to 20 parts by weight of microcapsules each encapsulating a heat-expandable substance; a sulfur-containing silane coupling agent is mixed in the rubber composition in an amount of 3 to 15 wt. % based on the weight of the silica; a shell material of each microcapsule is made of a thermoplastic resin which essentially contains a nitrile monomer (I); a vapor pressure of the heat-expandable substance is set at 1.4 to 3.0 MPa at 150° C.; an average particle diameter of the microcapsules is set at 20 to 30 μm before vulcanization of the rubber composition; an average particle diameter of the microcapsules expanded due to the vulcanization is set at 40 to 80 μm; and thus, a proportion of an area occupied by the cells in the tread rubber is set at 5 to 30%.
    • 本发明提供一种充气轮胎,即使在胎面橡胶含有二氧化硅的情况下,也可以通过令人满意地形成来自热膨胀性微胶囊的树脂封装的细胞来提高冰上的摩擦力。 轮胎的特征在于:胎面橡胶由含有100重量份二烯橡胶的橡胶组合物制成,30至100重量份的包含至少10重量份二氧化硅的增强填料和1至20重量份 每个包封热膨胀物质的微胶囊重量份; 将含硫硅烷偶联剂在橡胶组合物中以3〜15重量%的量混合。 基于二氧化硅的重量% 每个微胶囊的壳材料由基本上含有腈单体(I)的热塑性树脂制成; 在150℃下将热膨胀性物质的蒸气压设定为1.4〜3.0MPa。 在橡胶组合物硫化之前,将微胶囊的平均粒径设定为20〜30μm。 将由于硫化而膨胀的微胶囊的平均粒径设定为40〜80μm, 因此胎面胶中的细胞所占的面积的比例为5〜30%。