Mitsui Petrochemical Industries, Ltd.

Mitsui Chemicals, Inc.

Montedison S.p.a.

Yazaki Corporation

Hoechst Aktiengesellschaft

Mitsui Cehmicals, Inc.

Akinori Toyota

Norio Kashiwa

Mamoru Kioka

Toshiyuki Tsutsui

Sanehiro Yamamoto

Ken Yoshitsugu

Masao Nakano

Syuji Minami

Naoshi Ishimaru

Toshio Kimura

Takasi Nakagawa

Yoshihisa Ushida

Fumitoshi Ikejiri

Yoshikatsu Amimoto

Kiyoshi Odawara

Tetsuo Kato

Luciano Luciani

Kazuo Yagi

Masahiro Kanda

Masahiro Sugi

Pier C Barbe

Kazumitsu Kawakita

Masaya Yamada

Kazuto Sugiyama

Masanobu Ishiyama

Kazunori Okawa

Toshihiro Sagane

Hajime Inagaki

Shizuo Shimizu

Yoshinori Morita

Toshiyuki Hirose

Takeshi Shiraki

Kazuhiko Murata

Kenji Doi

Yoshiharu Abe

Kunie Hiroshige

Haruyuki Koda

Katunari Nishimura

Matsunao Maeda

Ken Yoshitugu

Yoshikatu Amimoto

The invention relates to a polymerization catalyst for alpha-olefins and a process for polymerizing alpha-olefins. The catalyst comprises a component having a transition metal compound supported on a carrier and an aluminoxane. The carrier may be pre-treated with an organometallic compound, a halogen-containing silicon compound or an aluminoxane. Alternatively, the above two catalyst components are subjected to preliminary polymerization of olefins. The catalyst of this invention enables the production of a spherical polymer having a good particle size distribution, an excellent bulk density and a narrow molecular weight distribution in a slurry polymerization method or a vapor-phase polymerization method, particulary the vapor-phase polymerization method. When applied to the copolymerization of at least two olefins, the catalyst has excellent polymerization activity such that an olefin copolymer having a narrow molecular weight distribution and a narrrow composition distribution is obtained.

Catalyst for polymerizing alpha-olefins and process for polymerization

A process for producing an alpha-olefin polymer, which comprises polymerizing an alpha-olefin in the presence of a catalyst formed from (A) a solid catalyst component comprising an inorganic carrier and deposited thereon a compound of a transition metal of Group IVB of the periodic table treated with an organometallic compound, and (B) an aluminoxane.

Process for polymerization of alpha-olefins

In accordance with the present invention, there are provided ethylene copolymers composed of structural units (a) derived from ethylene and structural units (b) derived from .alpha.-olefin of 3-20 carbon atoms, said ethylene copolymers having

Ethylene random copolymers

Presence of a catalyst formed from (A) a transition metal compound comprising (A-1) a transition metal atom, (A-2) a hetero atom-containing ligand containing a heteroatom selected from oxygen, sulfur, nitrogen and phosphorus capable of forming a bond with the transition metal atom, and (A-3) a ligand having a conjugated .pi. electron through which the ligand can be bonded to the transition metal atom (A-1), and (B) an aluminoxane. The transition metal compound is pre-treated with (C) an organometallic compound, or (D) a halogen-containing inorganic compound of an element of Group III, IV or V of the periodic table in an organic solvent.

Catalyst for the polymerization of alpha-olefins

The thermoplastic resin composition of the present invention comprises (A) polyamide having a melting point of not lower than 280.degree. C., particularly preferably (A-1) specific polyamide having a melting point of higher than 300.degree. C., (B) a specific modified polymer, (C) a hindered phenol type antioxidant having a molecular weight of not less than 500 and a TGA 10% weight loss temperature of not lower than 300.degree. C., and (D) a sulfur type antioxidant having a molecular weight of not less than 600 and a TGA 10% weight loss temperature of not lower than 280.degree. C. The molded product of the present invention is made of the above-mentioned thermoplastic resin composition. The thermoplastic resin composition of the invention is excellent in heat stability.

Thermoplastic resin composition and molded product thereof

In accordance with the present invention, there are provided ethylene copolymers composed of structural units (a) derived from ethylene and structural units (b) derived from .alpha.-olefin of 3.about.20 carbon atoms, said ethylene copolymers having

Olefin polymerization catalyst

A process for producing an alpha-olefin polymer, which comprises polymerizing an alpha-olefin in the presence of a catalyst formed from (A) a transition metal compound comprising (A-1) a transition metal atom, (A-2) a hetero atom-containing ligand containing a heteroatom selected from oxygen, sulfur, nitrogen and phosphorus capable of forming a bond with the transition metal atom, and (A-3) a ligand having a conjugated .pi. electron through which the ligand can be bonded to the transition metal atom (A-1), and (B) an aluminoxane. The transition metal compound may be pre-treated with (C) an organometallic compound, or (D) a halogen-containing inorganic compound of an element of Group III, IV or V of the periodic table.

This invention relates to a process for polymerizing olefins using a catalyst composed of a transition metal catalyst component, an aluminoxane component and an organoaluminum component. In the process of this invention, the catalyst exhibits excellent polymerization activity with the use of a small amount of the aluminoxane xane. The polymerization process gives olefin polymers having a narrow molecular weight distribution and by the copolymerization of two or more olefins, gives olefin copolymers having a narrow molecular weight distribution and a narrow composition distribution.

Process for polymerizing olefins

A prepolymerized solid catalyst for gaseous phase or slurry polymerization of alpha olefins is disclosed. The catalyst comprises a porous carrier having a particle size of 20 to 200 microns onto which has been deposited an aluminoxane and a transition metal compound having at least one cycloalkadienyl group, the transition metal being from group 4 of the Periodic Table. The transition metal is present in an amount of 0.003 to 3 mmol/gm of carrier, and the aluminum to transition metal atomic ratio is from 15 to 1000. This catalyst is then prepolymerized with 0.2 to 30 gm of an alpha olefin per gram of catalyst to form the final prepolymerized solid catalyst having an intrinsic viscosity of 0.2 to 20 dl/gm as measured in decalin at 135 deg C.

A catalyst for polymerization of an olefin, said catalyst being formed from

Process for polymerizing olefins and catalyst for polymerizing olefins

The cycloolefin resin compositions of the present invention comprise:

Cycloolefin resin composition

There is provided a process for producing a cyclic olefin copolymer by copolymerizing (A) ethylene and (B) a particular cyclic olefin in the presence of (C) a metallocene catalyst and (D) a small amount of an .alpha.-olefin having 3 to 20 carbon atoms. According to the said process, said copolymer can be produced at a high activity and its molecular weight can be controlled in a wide range. The copolymer produced by the said process has excellent properties inherent to the cyclic olefin copolymer.

Process for production of ethylene-cyclic olefin copolymer

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Iwakuni, Japan

Akinori Toyota