Patent ID: 6800689
Filing Date: 2004-10-05
Classification: C08C,C08F

Abstract:
A process for producing polymer rubber, which comprises the step of polymerizing a conjugated diene monomer or a combination of a conjugated diene monomer with an aromatic vinyl monomer in the presence of:(1) an organolithium compound represented by the following formula (I), in which Râ€² is an aliphatic or aromatic hydrocarbon group, which may contain a hetero atom, and X is an integer of 1 to 4, Râ€²(Li)xâ€ƒâ€ƒ(I) (2) a solvent, (3) tetrahydrofuran in an amount of 0.0106 to 0.1060% by weight, provided that an amount of the solvent is 100% by weight, and (4) ethylene glycol diethyl ether in an amount of 0.02 to 0.30% by weight, provided that an amount of the solvent is 100% by weight, wherein the polymer rubber satisfies the conditions:(a) a vinyl group content in the polymer rubber is not less than 60% by weight, provided that an amount of a conjugated diene monomer unit in the polymer rubber is 100% by weight, and (b) a Q value (Mw/Mn) of the polymer rubber is not more than 1.35.