Ube Industries, Inc.

Masato Murakami

Michinori Suzuki

Koji Shiba

Naomi Okamoto

Toshio Kurafuji

Mitsuharu Anbe

Noriaki Manada

Hiroaki Yamaguchi

Yasushi Yamamoto

Kouji Ishiguchi

Satoshi Bandai

Mitsuharu Eikyuu

Masahiro Tanaka

Koji Abe

Shuji Tanaka

Keigo Nishihira

Nobuharu Hisano

Nobuhiro Tsujimoto

Masafumi Kohda

Yuki Nishida

Takeshi Shoda

Osamu Kimura

Sakae Yuasa

Yasumasa Iwamoto

Toshifumi Fukunaga

Takashi Kitamura

Yuji Matsudaira

Takamasa Fujii

Koji Maeda

Yoshihira Hosoyama

Masanobu Kimura

Kanou Yuuto

Yuuki Takahashi

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 polyimide wherein a tetracarboxylic dianhydride including 3,3',4,4&#x2032;-phenyltetracarboxylic dianhydride as the essential component is the starting tetracarboxylic dianhydride component, and an amine comprising between 0.5 and 30 mole percent of a diamine represented by the following general formula is the starting diamine component. (wherein A is a direct bond or a crosslinking group, and R-Reach represent a substituent). It is possible to obtain a polyimide, a polyimide film and a laminated body with an improved adhesion property and an improved moisture permeation rate, even without surface treatment, comprising, as the essential tetracarboxylic dianhydride, 3,3&#x2032;,4,4&#x2032;-biphenyltetracarboxylic dianhydride which has conventionally only yielded polyimides with low adhesive strength.

Polyimide, polyimide film and laminated body

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 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 polyimide film-laminated body is composed of a metal layer and an aromatic polyimide layer formed by casting a polyamic acid solution composition, comprising 3,3',4,4&#x2032;-biphenyltetracarboxylic dianhydride as an essential tetracarboxylic dianhydride component and with introduction of a specific diamine component, onto a metal foil. The polyimide film-laminated body has an excellent gas permeation rate and moisture permeation rate, with heat resistance, a high elastic modulus and a low linear expansion coefficient, and with reduced foaming and delamination during the high-temperature steps for formation of the laminated body.

Polyimide film-laminated body

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

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

Modified polybutadiene having a high-cis and low-trans structure with a moderate 1,2-structure content and exhibiting improved characteristics such as cold flow properties, which is obtained by modifying starting polybutadiene having a Tcp/ML ratio (Tcp: 5% toluene solution viscosity at 25&deg; C.ML : Mooney viscosity at 100&deg; C.) of 2.5 or more in the presence of a transition metal catalyst.

Polybutadiene and process for producing the same

A polymer of ethylenically unsaturated monomer, for example, 1,3-butadiene, having a desired molecular weight and distribution thereof is produced, with a high stability, by preparing a solution of hydrogen in an inert organic solvent for the monomer in which a vapor-liquid phase equilibrium of hydrogen is attained, and then by addition-polymerizing the monomer in the hydrogen-dissolved inert organic solvent in the presence of a catalyst preferably including a metallocene complex of transition metal compound, an inert compound of a non-coordination anionic compound with a cationic compound, an organic metal (aluminum) compound and, optionally, water.

Method of producing a polymer

The present invention provides a process for the production of a conjugated diene polymer having a controlled microstructure at a high polymerization activity in the presence of a metallocene type complex of compound of transition metal of the group V of the Periodic Table. A novel catalyst is provided comprising (A) a metallocene type complex of a transition metal of the group V of the Periodic Table, (B) an ionic compound of a non-coordinating anion and a cation, (C) an organic metal compound of the groups I to III and (D) water, wherein the molar ratio of (C)/(D) is from 0.66 to 5. A novel process for the production of a conjugated diene polymer is also provided, which comprises the polymerization of a conjugated diene compound in the presence of a catalyst comprising (A) a metallocene type complex of a transition metal of the group V of the Periodic Table, (B) an ionic compound of a non-coordinating anion and a cation, (C) an organic metal compound of the groups I to III and (D) water, wherein the molar ratio of (C)/(D) is from 0.66 to 5.

Conjugated diene compound polymerization catalyst process for the preparation of conjugated diene polymer in the presence thereof and polybutadiene thus prepared

An ester compound, for example, carbonic acid ester or succinic acid ester, is produced by catalytically reacting, in gas phase, carbon monoxide with a nitrous acid ester and optionally an olefin in the presence of a catalyst and in the presence of a chlorine-containing substance, bringing the reaction product-containing mixed gas into contact with a solid catalyst such as activated carbon or inorganic oxide to reduce the content of the chlorine-containing substance, cool-condensing the resultant mixed gas, and collecting the target ester compound from the condensed liquid.

Method of producing an ester compound

Process for producing a carbonic acid diester

A carbonic acid diester is produced, at a high reaction rate with a high selectivity and stability, by catalytically reacting carbon monoxide with a nitrous acid ester, preferably in a gas phase, in the presence of a solid catalyst composed of a solid carrier and a catalytic solid material deposited on the carrier and comprising: (1) a first catalyst component comprising at least one member selected from the group consisting of platinum group metals and compounds thereof; (2) a second catalyst component comprising at least one member selected from the group consisting of lanthanide group metals and compounds thereof; and collecting the resultant carbonic acid diester from a reaction mixture discharged from the catalytic reaction step.

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Ichihara, Japan

Masato Murakami