| 摘要 |
<p>Provided are: a tire rubber composition which enables low fuel consumption properties and wear resistance properties to be improved while maintaining or improving a good wet grip performance; and a pneumatic tire which uses said composition. The present invention pertains to a tire rubber composition which contains a rubber component containing a diene polymer (1), silica, and a diene polymer (2), wherein: the diene polymers (1, 2) are modified diene polymers obtained by reacting (A) and (B) below; the number average molecular weight of the diene polymer (1) is 110,000 to 1,500,000; the number average molecular weight of the diene polymer (2) is 1,000 to 100,000; and the content of the diene polymer (2) with respect to 100 parts by mass of the rubber component is 2 to 25 parts by mass. (A) is an active conjugated diene polymer having an alkali metal terminal obtained by polymerizing conjugated diene monomers or a conjugated diene monomer and an aromatic vinyl monomer under the presence of (C) below. (B) is a denaturant having a functional group. (C) is a chemical species obtained by reacting a compound represented by formula (1) with an organic alkali metal compound.</p> |
