And tire rubber composition prepared using the same.

A rubber composition comprising a diene-based rubber (a), silica (b) at 5-100 parts by weight to 100 parts by weight of said diene-based rubber (a) and a compatibilizer (c) 0, 1 -20 parts by weight for 100 parts by weight of said silica (b), wherein said compatibilizer (c) is at least one selected from: (I) aminosilane compounds; (II) compounds containing epoxy groups; (III) compounds with an amino group and a hydroxyl group, an amino group and an epoxy group, an amino group and an ether bond, an amino group and a carboxyl group, an amino group and an ester linkage or an amino group and a polymerizable unsaturated bond in the molecule. (IV) compounds with a polymerizable unsaturated bond and a hydroxyl group, a polymerizable unsaturated bond and an epoxy group, a polymerizable unsaturated bond and an ether bond, a polymerizable unsaturated bond and a carboxyl group or a polymerizable unsaturated bond and an ester bond in the molecule; (V) compounds containing ether linkages; and (VI) carboxylates; wherein said diene-based rubber (a) contains copolymer rubber styrene butadiene 30-100% with respect to said diene-based rubber (a) and said copolymer rubber styrene-butadiene has (i) a content styrenic component 5-45% by weight; (Ii) a content of 1, 2 butadienicos of 10-80% by weight; and (iii) a glass transition temperature of -70 to - 10 ° C; and any of the selected conditions of the following conditions (iv-1), (iv-2) and (iv-3): (iv-1) an amino group content of 0, 2/1, 0 millimoles per 100 g said copolymer rubber; (Iv-2) an alkoxysilyl group content of 0, 01-5, 0 millimoles per 100 g of said copolymer rubber; (Iv-3) an alkoxysilyl group content of 0, 01-5, 0 millimoles and an amino group content of 0, 2/1, 0 millimoles per 100 g of said copolymer rubber.