Patent ID: 10081699

Abstract:
A rubber composition contains a diene rubber component containing at least 20 mass % of a modified conjugated diene rubber, a silica, and a silane coupling agent; the modified conjugated diene rubber having at least one modified part and at least one conjugated diene rubber part; the conjugated diene rubber part having a conjugated diene copolymer block and an isoprene block containing from 70 mass % to 100 mass % of isoprene units in each conjugated diene rubber part; the modified part bonding to an end of the conjugated diene rubber part and having a functional group which interacts with the silica; a content of the silica being from 60 to 200 parts by mass per 100 parts by mass of the diene rubber component; the silane coupling agent being a polysiloxane represented by formula (1), (A)a(B)b(C)c(D)d(R1)eSiO(4-2a-b-c-d-e)/2, and having a content from 1.0 to 20 mass % of the content of the silica.