Patent ID: 9475923
Filing Date: 2016-10-25
CPC Classification: B60C,C08F,C08K,C08L,Y02T

Claim Text:
1. A rubber composition, comprising: (i) a block copolymer (A) comprising: (ii) at least one polymer (B) selected from the group consisting of natural rubber, isoprene rubber, butadiene rubber, a styrene-butadiene rubber other than the block copolymer (A), an ethylene-α-olefin copolymer rubber, an ethylene-α-olefin-diene copolymer rubber, an acrylonitrile-butadiene copolymer rubber, chloroprene rubber, and a halogenated butyl rubber; and (iii) at least one filler (C) selected from the group consisting of silica and carbon black, wherein: a glass transition temperature of the polymer block (a-2) is lower than a glass transition temperature of the polymer block (a-1) in the block copolymer (A); the block copolymer (A) comprises at least one functional group selected from the group consisting of an amino group, an imino group, a pyridyl group, a piperazyl group, and a thiol group, or a functional group obtained by subjecting each of these functional groups to onium salt formation, and at least one functional group selected from the group consisting of a hydrocarbyloxysilyl group and a silanol group in the end of the polymer block (a-2) side; the block copolymer (A) has two glass transition temperatures separated from each other by 5° C. or more within a range of −100 to 20° C. by a measurement in accordance with ASTM D3418; and a fraction of the block copolymer(A) is 10% by mass or more when a sum of the block copolymer (A) and the polymer (B) is taken as 100% by mass.