| abstract |
Disclosed is a polar group-containing copolymer which is capable of providing a rubber composition and a studless tire, each enables the achievement of a good balance among wear resistance, on-ice performance and steering stability on dry road surfaces.nSpecifically disclosed is a polar group-containing copolymer which is obtained by copolymerizing a conjugated diene compound and a polar group-containing vinyl compound. The polar group-containing copolymer is characterized in that the polar group-containing vinyl compound is a compound having a polymerizable unsaturated bond and a polar group, in said compound one of the carbon atoms forming the polymerizable unsaturated bond being bonded, via at least one carbon atom, to the carbon atom to which the polar group is bonded, and that the cis content in the double bond portion of the conjugated diene compound is not less than 80% by mole. |