Ube Industries, Inc.

Koji Shiba

Masato Murakami

Michinori Suzuki

Naomi Okamoto

Masashi Shirai

Mitsuharu Anbe

Katsumasa Harada

Toshio Furuya

Masahiro Tanaka

Shigeru Yao

Takeshi Shoda

Koji Shibata

Yoichi Okubo

Hideo Sano

Yuta Yamada

Suguru Fukazawa

Yuji Matsudaira

Takeshi Kita

Takashi Kino

A method for producing a conjugated diene polymer having a high content of cis-1,4-structures with a high activity, a conjugated diene polymer, and a modified conjugated diene polymer. The catalyst for conjugated diene polymerization in the method includes: a non-metallocene type gadolinium compound (A) represented by the general formula (1); an ionic compound (B) formed of a non-coordinating anion and a cation; and an organic metal compound (C) of an element selected from the group consisting of a group 2, a group 12, and a group 13 of the periodic table.

Method of producing a conjugated diene polymer, a modified conjugated diene polymer, and a vinyl cis-polybutadiene composition

A conjugated diene polymer having a high content of cis-1,4-structures with a high activity, a conjugated diene polymer and a modified conjugated diene polymer using the same, a rubber composition for a tire, and a rubber composition for a rubber belt. Described are a catalyst for a conjugated diene polymerization including: a non-metallocene type gadolinium compound (A) represented by the general formula (1); an ionic compound (B) formed of a non-coordinating anion and a cation; and an organic metal compound (C) of an element selected from the group consisting of a group 2, a group 12, and a group 13 of the periodic table, a conjugated diene polymer and a modified conjugated diene polymer obtained using the same, a rubber composition for a tire, and a rubber composition for a rubber belt.

Conjugated diene polymer and modified conjugated diene polymer produced using the same, rubber composition for tire, and rubber composition for rubber belt

A catalyst for a conjugated diene polymerization including a metal compound (A) containing terbium, lanthanum, dysprosium, praseodymium, holmium, erbium, thulium, or gadolinium, an ionic compound (B) consisting of a non-coordinating anion and a cation, and an organic metal compound (C) of an element selected from the groups 2, 12 and 13 of the periodic table; a process for producing a conjugated diene polymer and a modified conjugated diene polymer using the same; a conjugated diene polymer; and a modified conjugated diene polymer.

Catalyst for conjugated diene polymerization, conjugated diene polymer, modified conjugated diene polymer, polybutadiene, and compositions comprising foregoing

Disclosed is a process for producing a conjugated diene polymer having a very high content of cis-1,4 structures by using an yttrium compound-containing catalyst that is relatively easy to handle and has a high activity. Specifically disclosed is a process for producing a conjugated diene polymer containing cis-1,4 structures at a ratio of 99% or higher, which is characterized by polymerizing a conjugated diene in the presence of a catalyst produced from (A) a specific yttrium compound, (B) an ionic compound consisting of a non-coordinating anion and a cation, and (C) an organoaluminum compound.

Process for producing conjugated diene polymer

Provided by using a catalyst containing an yttrium compound is conjugated diene polymer with very low solution viscosity, improved workability, high degree of branching, and high content of cis-1,4 structures. Also provided is a rubber composition utilizing the polymer and allowing excellent dispersion of reinforcing agent. According to a method of manufacturing a conjugated diene polymer characterized by polymerizing a conjugated diene at 50 to 120&#xb0; C. in the presence of a catalyst obtained from (A) an yttrium compound, (B) an ionic compound consisting of a non-coordinating anion and a cation, and (C) an organoaluminum compound, the conjugated diene polymer has the following characteristics that: (1) a ratio (T/ML) between a 5 wt % toluene solution viscosity (T) measured at 25&#xb0; C. and a Mooney viscosity (ML) at 100&#xb0; C. is 0.1 to 1.2; and (2) a content of cis-1,4 structures is 80% or higher, and a content of 1,2 structures is lower than 5%.

Conjugated diene polymer manufacturing method, polybutadiene, and rubber composition utilizing the same

A method for producing a polybutadiene, which comprises subjecting 1,3-butadiene to cis-1,4 polymerization, and subsequently subjecting a resultant in the resulting polymerization system to syndiotactic-1,2 polymerization, the method being characterized in that there is added, after the polymerization, a halogen acid or halogen acid salt.

Method for producing polybutadiene

Silicon carbide-based fine particles containing an electrically conducting inorganic substance and a electromagnetic wave absorbing material, which are fine particles comprising a particle inner portion of a silicon carbide-based material and a surface layer formed of an electrically conducting inorganic substance mainly comprising carbon, wherein a gradient layer with the compositional ratio of the electrically conducting inorganic substance gradiently increasing toward the particle surface is present and the thickness of the electrically conducting inorganic substance gradient layer is from 1 to 500 nm. The electromagnetic wave absorbing material of the present invention can selectively absorb a electromagnetic wave of 1 to 300 GHz in a wide band.

Electrically conducting-inorganic substance-containing silicon carbide-based fine particles, electromagnetic wave absorbing material and electromagnetic wave absorber

Process for preparing piperonal

A process for preparing 3,4-methylenedioxymandelic acid by reacting 1,2-methylenedioxybenzene with glyoxylic acid in the presence of a strong acid and of at least one substance selected from the group consisting of an aprotic organic solvent and 100 to 1200 ml of an organic acid per kg of 1,2-methylenedioxybenzene.

Process for the preparation of 3,4-methylenedioxymandelic acid

3,4-dihydroxybenzonitrile useful as a starting compound for synthesis of medicines and agricultural chemicals is produced, with a high yield by chlorinating 3,4-methylenedioxybenzonitrile with sulfuryl chloride or a mixture of molecular chlorine with a chlorination-promoter including phosphorus trichloride, phosphorus pentachloride, sulfuryl chloride, thionyl chloride, and/or nitrosyl chloride, to prepare 2-chloro-benzo&lsqb;1,3&rsqb;dioxole-5-carbonitrile, and hydrolyzing 2-chloro-benzo&lsqb;1,3&rsqb;dioxole-5-carbonitrile by contacting it with water to produce 3,4-dihydroxybenzonitrile.

Growing community of inventors

Ichihara, Japan

Koji Shiba