| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pneumatic tire allowing improvement of run-flat durability without impairing rolling resistance and riding comfort during normal traveling. <P>SOLUTION: This pneumatic tire includes a bead core, a carcass layer, a tread rubber layer, an inner liner, a pair of cross-sectionally crescent-shaped side reinforcing rubber layers and a bead filler. In the pneumatic tire, a rubber composition for the (A-1) side reinforcing rubber layers and/or the bead filler includes a (B) rubber component and (C) carbon black 55 mass part or more in relation to the 100 mass part and has≥10 MPa in 100% elongation elasticity (M100) and aΣvalue of≤6.0 at 28-150°C of tangent loss tanδin physical properties of vulcanized rubber, and an air permeability coefficient of a rubber composition to be used for the (A-2) inner liner at 60°C is≤6.0×10<SP>-10</SP>cm<SP>3</SP>-cm/cm<SP>2</SP>-sec-cmHg. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
