Rubber composition and pneumatic tire

摘要

The present invention provides a rubber composition that achieves a well-balanced improvement in fuel economy, wet-grip performance, and abrasion resistance, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition, including a rubber component and silica, wherein the rubber component contains not less than 5% by mass of a conjugated diene polymer, based on 100% by mass of the rubber component, the conjugated diene polymer containing a constituent unit derived from a conjugated diene and a constituent unit represented by the following formula (I):;
at least one terminal of the conjugated diene polymer being modified by a compound containing a group represented by the following formula (II):
;
and wherein the silica is contained in an amount of 5 to 150 parts by mass per 100 parts by mass of the rubber component.

主权项

1. A rubber composition, comprising a rubber component and silica, wherein the rubber component comprises 10 to 60% by mass natural rubber and 10 to 60% by mass butadiene rubber, based on 100% by mass of the rubber component, and the rubber component contains not less than 5% by mass of a conjugated diene polymer, based on 100% by mass of the rubber component, and
wherein the silica is contained in an amount of 5 to 150 parts by mass per 100 parts by mass of the rubber component, the conjugated diene polymer comprising a constituent unit derived from a conjugated diene and a constituent unit represented by the following formula (I):wherein X1, X2, and X3 each independently represent a group represented by the formula (Ia) below, a hydroxyl group, a hydrocarbyl group, or a substituted hydrocarbyl group, and at least one of the X1, X2, and X3 is a hydroxyl group or a group represented by the formula (Ia):wherein R1 and R2 each independently represent a C1-6 hydrocarbyl group, a C1-6 substituted hydrocarbyl group, a silyl group, or a substituted silyl group, and the R1 and R2 may be bonded to each other to form a cyclic structure together with the nitrogen atom,
at least one terminal of the conjugated diene polymer being modified by a compound containing a group represented by the following foiinula (II):wherein m represents an integer of 1 to 11; and A represents a functional group containing a nitrogen atom.