Rubber composition for tread and pneumatic tire

摘要

It is an object of the present invention to provide: a rubber composition for a tread, which improves processability, rolling resistance, wet skid performance, abrasion resistance, and handling stability in good balance; and a pneumatic tire having a tread produced from the rubber composition. The present invention relates to a rubber composition for a tread, including: a rubber component; an aromatic vinyl polymer; silica; and a mercapto group-containing silane coupling agent, wherein the aromatic vinyl polymer is a resin obtained by polymerization of α-methylstyrene and/or styrene, and the amount of the aromatic vinyl polymer is 3 to 25 parts by mass, and the amount of the silica is 15 to 150 parts by mass, based on 100 parts by mass of the rubber component.

主权项

1. A rubber composition for a tread, comprising:
a rubber component; an aromatic vinyl polymer; silica; and a mercapto group-containing silane coupling agent, wherein the aromatic vinyl polymer is a copolymer of α-methylstyrene and styrene, and the mercapto group-containing silane coupling agent is a copolymer comprising units A represented by formula (1) and units B represented by formula (2), and the proportion of the units B is 1 to 70 mol % of the total molar amount of the units A and the units B: wherein x and y each are an integer of one or more, R1 represents hydrogen, halogen, a branched or unbranched C1-30 alkyl or alkylene group, a branched or unbranched C2-30 alkenyl or alkenylene group, a branched or unbranched C2-30 alkynyl or alkynylene group, or a group obtained by replacing the end of the alkyl or alkenyl group with a hydroxy or carboxyl group, R2 represents hydrogen, a branched or unbranched C1-30 alkylene or alkyl group, a branched or unbranched C2-30 alkenylene or alkenyl group, or a branched or unbranched C2-30 alkynylene or alkynyl group, and R1 and R2 may form a ring structure together, and the amount of the aromatic vinyl polymer is 3 to 25 parts by mass, and the amount of the silica is 15 to 150 parts by mass, based on 100 parts by mass of the rubber component.