Japan Elastomer Co., Ltd.

Takaaki Matsuda

Hideki Yamasaki

Disclosed is a rubbery polymer comprising a conjugated diene polymer, and bonded thereto, a lithium-detached residue of a lithium-containing organic polymer used as a catalyst in the production of the conjugated diene polymer, wherein the lithium-containing organic polymer is obtained by reacting an organolithium compound with a first polymerizable material comprising at least one conjugated diene monomer and a second polymerizable material comprising at least one aromatic vinyl compound, which second polymerizable material contains at least one multi-vinyl aromatic compound having at least two vinyl groups, and wherein the lithium-containing organic polymer has a specific narrow molecular weight distribution. The rubbery polymer of the present invention is commercially advantageous in that, by using it as a reinforcing agent for a styrene polymer resin, there can be obtained a high impact styrene polymer resin composition which is useful for producing shaped articles having an excellent balance of impact resistance and appearance (luster).

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Ooita, Japan

Takaaki Matsuda