Rubber composition and pneumatic tire

摘要

The present invention relates to a rubber composition for a tire that includes silica and a rubber component that 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 represented by the following formula (II):
;

主权项

1. A pneumatic tire having a tread formed from a rubber composition, comprising a rubber component and silica,
wherein the rubber component contains 30 to 90% by mass of a conjugated diene polymer, based on 100% by mass of the rubber component, the conjugated diene polymer is a styrene-butadiene copolymer rubber 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 hydroxyl group, or a C1-4 alkyl group, and at least one of the X1, X2, and X3 is a hydroxyl group,
at least one terminal of the conjugated diene polymer being modified by a compound represented by the following formula (II):wherein n represents an integer of 1 to 10; R3, R4, and R5 each independently represent a C1-3 alkyl group or a C1-3 alkoxy group, and at least one of the R3, R4, and R5 is a C1-3 alkoxy group; and A is a group represented by the formula (IIa) below:wherein R6 and R7 each independently represent a C1-6 alkyl group, and
wherein the rubber component further contains natural rubber and butadiene rubber, and the total content of natural rubber and butadiene rubber is 10 to 70% by mass, the natural rubber content is 5 to 60% by mass, and the butadiene rubber content is 5 to 60% by mass, based on 100% by mass of the rubber component, and the silica is contained in an amount of 10 to 100 parts by mass per 100 parts by mass of the rubber component.