Sumitomo Chemical Company, Limited

Seiichi Mabe

Katsunari Inagaki

Mayumi Oshima

Yoshihiro Nakatsuji

A process for producing a modified polymer rubber comprising the steps of:

Process for producing modified polymer rubber

There is provided a process for producing a both end-modified diene polymer rubber comprising the steps of:

Process for producing modified diene polymer rubber

There is provided 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, (2) a solvent, (3) tetrahydrofuran in an amount of 0.0106 to 0.1060% by weight, and (4) ethylene glycol diethyl ether in an amount of 0.02 to 0.30% by weight, wherein the polymer rubber satisfies the conditions of (a) a vinyl group content in the polymer rubber is not less than 60% by weight, and (b) a Q value (Mw/Mn) of the polymer rubber is not more than 1.35.

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Ichihara, Japan

Seiichi Mabe