| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire using a rubber composition which is excellent in low heat build-up property and wear resistance and suitable for a tread. SOLUTION: A rubber composition, in which hydrous silicic acid having a specific structure represented below, and as a dispersant, at least one of hydrazide compounds and compounds each having an oxazoline part, thiazoline part, alkoxysilane part or allyltin part and a bipolar nitrogen-containing part are incorporated in natural rubber and/or diene-based synthetic rubber, is used for a tread. The hydrous silicic acid is characterized in that the cetyltrimethylammonium bromide-adsorption specific surface area (CTAB) (m<SP>2</SP>/g) and the diameter A<SB>ac</SB>(nm) of the most frequent number value of the primary aggregate found by acoustic particle size distribution measurement satisfy the following formula (A): A<SB>ac</SB>≥-0.76×(CTAB)+274, and the ignition loss (mass loss (%) when heated at 750°C for 3 h) and the heating loss (mass loss (%) when heated at 105°C for 2 h) satisfy following formula (B): (ignition loss)-(heating loss)≤3. COPYRIGHT: (C)2011,JPO&INPIT
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