| abstract |
It is an object of the present invention to provide: a rubber composition for tires having excellent abrasion resistance, wet performance, dry performance and excellent low rolling resistance when used in a tire; and a pneumatic tire using the rubber composition for tires in a tread portion thereof. The rubber composition for tires according to the present invention comprises: a natural rubber, a diene-based compound rubber containing a solution-polymerized SBR and an emulsion-polymerized SBR, an aromatic modified terpene resin, a silica and an carbon black. The solution-polymerized SBR contains a specific solution-polymerized SBR having a block containing an isoprene unit at a certain end thereof and a modified end for silica at the other end thereof. The styrene unit content in the emulsion-polymerized SBR is between 35 and 50 percent by mass. The content of the natural rubber and the total content of the solution-polymerized SBR and the emulsion-polymerized SBR in the diene-based compound rubber are determined, and the contents of the aromatic modified terpene resin, silica and carbon black relative to the content of the diene-based compound rubber are determined. |