Idemitsu Kosan Company, Limited

Hiroshi Maezawa

Norio Tomotsu

Junichi Matsumoto

Masahiko Kuramoto

Masami Watanabe

Takuji Okamoto

Hiroshi Hayashi

Satoshi Asahi

Koji Yamamoto

Hideki Aiura

A process for effectively producing a cyclic olefin polymer and a cyclic olefin/alpha-olefin copolymer without opening the cyclic olefin, is disclosed. Further, a novel cyclic olefin/alpha-olefin copolymer prepared by the above-mentioned process, compositions and molded articles comprising the novel copolymer, are also disclosed. In the process for producing a cylcic olefin based polymer according to the present invention, homopolymerization of a cyclic olefin or copolymerization of a cyclic olefin and an alpha-olefin is effected in the presence of a catalyst comprising, as main ingredients, the following Compounds (A) and (B), and optionally Compound (C):

Process for producing cyclic olefin based polymers

Cyclic olefin copolymers, compositions and molded articles comprising

Process for producing cyclic olefin based polymers, cyclic olefin

A catalyst for producing styrene-based polymers, containing (A) a titanium compound, (B) a contact product of an organoaluminum compound and water, and (C) an organic polyhydroxy compound, or (A) a titanium compound and (B) a contact product of an organoaluminum compound, water and a organic polyhydroxy compound, and a process for producing styrene-based polymers by the use of the above catalyst.

Process for producing styrene-based polymers and catalyst for use therein

Catalyst for the production of styrene-based polymers

A process for producing a norbornene polymer consisting essentially of a repeating unit of the formula (I) ##STR1## wherein R.sup.1 to R.sup.12 are the same or different and are hydrogen, C.sub.1 -C.sub.20 hydrocarbon, or a group having a halogen, oxygen or nitrogen, R.sup.5 and R.sup.7 may combine to form a ring, and n is an integer of 0 or more; and having a weight average molecular weight as determined by GPC of 1.times.10.sup.5 to 1.times.10.sup.7. The process comprises polymerizing a norbornene monomer of the formula (II) ##STR2## wherein R.sup.1 to R.sup.12 are the same or different and are independently hydrogen, C.sub.1 -C.sub.20 hydrocarbon, or a substituent containing a halogen atom, an oxygen atom or a nitrogen atom; R.sup.5 and R.sup.7 may combine together to form a ring; and n is an integer of 0 or more, in the presence of a catalyst containing a transition metal compound component containing a transition metal belonging to Group VB, VIB, VIIB or VIII of the Periodic Table, and an aluminoxane components.

Process for producing a norbornene polymer

Process for producing styrene-based polymers and catalysts for use

A process for producing a styrene-based polymer, particularly a styrene-based polymer having mainly a syndiotactic structure by polymerizing a styrene-based monomer in the presence of a filler by using a catalyst containing (A) a titanium compound and (B) aluminoxane as main components. The filler acts as a catalyst carrier, increasing catalyst activity, and thus de-ashing treatment is not needed. When the filler is used in a large amount, there is obtained a composition in which the filler is uniformly dispersed in the styrene-based polymer. The styrene-based polymer or styrene-based polymer-containing composition is excellent in heat resistance and chemical resistance.

Process for production of styrene-based polymers

The present invention relates to a process for preparing aluminoxane which comprises reacting an organoaluminum compound and water in a solvent system containing solvent having a higher boiling point than that of the organoaluminum compound, or reacting an organoaluminum compound and water, and then adding a solvent system containing the solvent having a higher boiling point than that of the organoaluminum compound to the reaction mixture; and thereafter condensing the resulting reaction mixture under atmospheric pressure or reduced pressure.

Process for preparation of aluminoxane

Disclosed is a process for drying aluminoxane, which comprises drying a viscous solution containing aluminoxane, while applying a shearing force sufficient to keep said viscous solution in polydispersive state, so as to make the solution to be a solid-state polydispersoid. Also disclosed is a process for producing a polymer which comprises polymerizing a polymerizable monomer, using the aluminoxane obtained by the process of the present invention. According to the process of the present invention, aluminoxane in uniform powder which is easy to treat can be efficiently obtained in an industrial scale, and polymers can be produced at high efficiency.

Process for drying aluminoxane and process for producing polymers

A catalyst for producing styrene-based polymers having mainly syndiotactic configuration which comprises (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al-CH.sub.3) bond as determined by the proton nuclear magnetic resonance absorption method.

Catalyst for producing syndiotactic configuration styrene-based polymers

A process for producing styrene-based polymers having mainly syndiotactic configuration in the presence of a catalyst comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al--CH.sub.3) bond as determined by the proton nuclear magnetic resonance absorption method. According to this process, styrene-based polymers having mainly syndiotactic configuration can be efficiently and economically produced.

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Ichihara, Japan

Hiroshi Maezawa