Patent ID: 8722810

Claim:
A method for preparing a modified conjugated diene polymer, comprising a polymerization step for polymerizing conjugated diene monomers to form a conjugated diene polymer; and a modifying step for reacting the conjugated diene polymer with a modifier to form a modified conjugated diene polymer, wherein the modifying step is carried out in the presence of an accelerator comprising a peroxy acyl compound, a peroxy ester compound, a peroxy ketal compound, a peroxy carbonate compound, or an azo compound having a nitro group and a heterocyclic group, the modifier includes a polythiol ester compound, a polythiol alkane compound or a combination thereof, the polythiol ester compound has a chemical formula (I): R a -(O—C(═O)R b -SH) x (I), Ra is a x-valent aliphatic hydrocarbon residue with 4˜8 carbon atoms, a cyclo aliphatic hydrocarbon residue with 5˜10 carbon atoms, or an aromatic hydrocarbon residue with 6˜9 carbon atoms, Rb is an aliphatic hydrocarbon residue with 1˜15 carbon atoms, x is an integer of 2˜4, the polythiol alkane compound has a chemical formula (II): HS—(CH 2 ) m —(R d ) n CH 2 SH (II), m and n are independently an integer of 0˜10, Rd has a structural formula (III), a is an integer of 0˜10, b is an integer of 0˜1.