Tire rubber composition and pneumatic tire

摘要

The present invention provides a tire rubber composition with which the grip performance, the abrasion resistance, and the performance in terms of rolling resistance are improved in a balanced manner. The present invention relates to a tire rubber composition comprising: a modified diene rubber A which is modified with a specific acrylamide compound; and a modified diene rubber B which is modified with a specific modifying compound alone or together with a specific silicon or tin compound, a weight average molecular weight of a total of the modified diene rubbers A and B being 300,000 to 1,400,000.

主权项

1. A tire rubber composition comprising:
a modified diene rubber A which is modified with an acrylamide compound represented by the following formula (I); and a modified diene rubber B which is modified with a modifying compound represented by the following formula (III) alone or together with a silicon or tin compound represented by the following formula (II), a weight average molecular weight of a total of the modified diene rubbers A and B being 300,000 to 1,400,000, the formula (I) being as follows: wherein R1 represents hydrogen or a methyl group, R2 and R3 each represent an alkyl group, and n represents an integer; the formula (II) being as follows:
RaMXb  (II) wherein R represents an alkyl, alkenyl, cycloalkenyl, or aromatic hydrocarbon group, M represents silicon or tin, X represents halogen, a represents an integer of 0 to 2, and b represents an integer of 2 to 4; and the formula (III) being as follows: wherein R4 to R6 are the same as or different from each other and each represent a C1-8 alkyl group, R7 to R12 are the same as or different from each other and each represent a C1-8 alkoxy or alkyl group, and p to r are the same as or different from each other and each represent an integer of 1 to 8.