Sumitomo Chemical Company, Limited

Zs Elastomers Co., Ltd.

Seon Corporation

Hiroshi Aoshima

Katsunari Inagaki

Hisakatsu Hama

Jesus Rodriguez Castanon

Masako Imai

A conjugated diene copolymer has a covalent bond reversibly dissociated and added by heat, and has at least two peaks in each of curves of molecular weight distributions measured at 40° C. and 60° C. by gel permeation chromatography, wherein a change rate of the proportion of the area of the peak having the lowest molecular weight in measurement at 60° C. to the proportion of the area of the peak having the lowest molecular weight in measurement at 40° C.

Conjugated diene copolymer and method for manufacturing conjugated diene copolymer

The method for producing a conjugated diene-based polymer of the invention comprises step 1 in which a polymerization initiator is added to a monomer including a conjugated diene compound in a hydrocarbon solvent to obtain a polymerization solution, and step 2 in which a polymerization initiator is further added to the polymerization solution either once or two or more times to obtain a polymer with an active end, wherein in step 1 and/or step 2, a modifying agent is added which has a functional group that is copolymerizable with the conjugated diene compound.

Conjugated diene polymer and method for producing conjugated diene polymer

The invention relates to a method for producing a modified conjugated diene-based polymer, comprising a step of reacting an organometallic compound with a unit based on a modifying agent, in a conjugated diene-based polymer that has a unit based on a conjugated diene compound-containing monomer and a unit based on a modifying agent having a silicon atom, tin atom, germanium atom or phosphorus atom.

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Ichihara, Japan

Hiroshi Aoshima