Ube Industries, Inc.

Kouji Ishiguchi

Naomi Okamoto

Michinori Suzuki

Masato Murakami

Mitsuharu Eikyuu

A catalyst for polymerization of conjugated diene is provided, which facilitates manufacture of a conjugated diene polymer with a high 1,4-cis structure content, leaves less aluminum residue on polymerization, and has high activity. A method of manufacturing conjugated diene polymers using the catalyst is also provided. A catalyst for polymerization of conjugated diene comprises (A) an yttrium compound; (B) an ionic compound including a non-coordinate anion and a cation; and (C) an organometallic compound including an element selected from the groups 2, 12 and 13 of the periodic table.

Catalyst for polymerization of conjugated diene and method of polymerizing conjugated diene using the catalyst, rubber composition for tires, and rubber composition for golf balls

A rubber composition comprises a rubber component. The rubber component contains (A) 1-70 weight parts of polybutadiene rubber having a Mooney viscosity (ML) of 35-50 and composed of (a) 1-9 weight % of a boiled n-hexane insoluble fraction having a melting point of 180&#xb0; C. or higher and (b) 99-91 weight % of a boiled n-hexane soluble fraction. The rubber component also contains (B) 99-30 weight parts of diene-based rubber other than (A). A crosslinking coagent (C) is mixed in the rubber component.

Rubber composition and golf ball including the same as rubber base material

A catalyst for polymerization of conjugated diene comprises (A) an yttrium compound; (B) an ionic compound including a non-coordinate anion and a cation; and (C) an organometallic compound including an element selected from the groups 2, 12 and 13 of the periodic table.

Catalyst for polymerization of conjugated diene and method of polymerization conjugated diene using the catalyst, rubber composition for tires, and rubber composition for golf balls

Growing community of inventors

Ichihara, Japan

Kouji Ishiguchi