Patent ID: 8907023

Claim:
A method for preparing a modified conjugated diene-vinyl aromatic copolymer, comprising: polymerizing an organic alkali metal compound with conjugated diene monomers and vinyl aromatic hydrocarbon monomers to obtain a conjugated diene-vinyl aromatic copolymer, wherein a weight ratio of the conjugated diene monomers and the vinyl aromatic hydrocarbon monomers ranges from 2:1 to 5:1; and reacting the conjugated diene-vinyl aromatic copolymer with a polysiloxane compound to form the modified conjugated diene-vinyl aromatic copolymer, wherein the polysiloxane compound having a structure represented by formula 1: wherein each of F 1 , F 2 , F 3 and F 4 is different from each other, wherein F 1 and F 2 is individually selected from the group consisting of a C 2 ˜C 10 hydrocarbon group having at least one epoxy group, a C 2 ˜C 10 hydrocarbon group having at least one carbonyl group, a C 2 ˜C 10 hydrocarbon group having at least one alkoxy group and a C 2 ˜C 10 hydrocarbon group having at least one SiCl group, F 3 is a C 2 ˜C 10 hydrocarbon group having at least one amino group, F 4 is selected from the group consisting of a C 2 ˜C 10 hydrocarbon group having at least one alkoxy group and a C 2 ˜C 10 hydrocarbon group having at least one aryl group, n is an integer from 1 to 60, m is an integer from 1 to 60, X is an integer from 1 to 60, Y is an integer from 1 to 60, and Z is an integer from 0 to 300.