Patent ID: 7846993

Claim:
A method of preparing an organic silica master batch elastomer for a tire, which comprises: a first step of polymerizing a conjugated diene based monomer and a vinyl aromatic monomer to prepare a copolymer; a second step of reacting silica with 1 to 10 weight %, based on the amount of silica, of an organosilicon compound represented by the following Chemical Formula 1 R 1 —Si—(OH) 3 (Chemical Formula 1) wherein R 1 represents a C 5 to C 20 alicyclic hydrocarbon compound; and 1 to 10 weight %, based on the amount of silica, of a silane coupling agent represented by the following Chemical Formula 2 (EtO) 3 SiCH 2 CH 2 CH 2 —(S) n —CH 2 CH 2 CH 2 Si(OEt) 3 (Chemical Formula 2) wherein n is 2 or 4; to prepare organically surface-modified silica; and mixing 100 parts by weight of the copolymer prepared in the first step with 10 to 150 parts by weight of the organically modified silica prepared in the second step in solution, and drying to prepare a master batch elastomer.