| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a rubber composition for a base tread capable of improving low fuel consumption property and fracture resistance strength in a good balance and to provide a pneumatic tire using the same.SOLUTION: The invention relates to a rubber composition for a base tread containing a rubber component, silica and a silane coupling agent having a mercapto group, and having the content of a conjugated diene-based polymer having a constitutional unit based on a conjugated diene and a constitutional unit based on a compound represented by the formula (1) of 5 mass% or more in 100 mass% of the rubber component, and the content of the silica of 5 to 150 pts.mass based on 100 pts.mass of the rubber component. (1), where m represents 1 or 2, n represents 1 or 2, m+n is 2 or 3, Rrepresents a hydrocarbyl group having a polymerizable carbon-carbon double bond, Rrepresents a hydrocarbyl group, a plurality of Rmay be same or different when there are a plurality of R, Rrepresents an aryl group may have an oxygen-containing substituent, a plurality of Rmay be same or different when there are a plurality of R, Rrepresents an alkyl group or a substituted amino group.</p> |
