Ube Industries, Inc.

Toho Catalyst Co., Ltd.

Motozo Yoshikiyo

Hiroshi Sato

Toshikazu Machida

Yasuhiro Tanaka

Nobuyuki Kuroda

Mikio Fujimoto

Mitsumasa Tsugawa

Sanae Hatakenaka

Takefumi Yano

Kunihiko Tashino

Hiroyuki Ikeuchi

Toshifumi Fukunaga

Iwao Okamoto

Satoru Chosa

Kazuo Inoue

Shizuka Yoshii

Hiroshio Sato

A process for the production of trialkoxyhalosilanes which comprises reacting a tetrahalosilane [37] with a tetra-alkoxysilane [38] in the presence of an alcohol whose alkoxy group is the same as those of the tetraalkoxysilane to thereby obtain a trialkoxyhalosilane [39], characterized in that the alcohol is used in an amount of 5 to 50% by mole based on the total amount of Si of the tetrahalosilane and the tetraalkoxysilane: SiX[37] (wherein X is halogeno) Si(OR)[38] (wherein Ris a hydrocarbon group having 1 to 6 carbon atoms) XSi(OR)[39] (wherein X and Rare each as defined above).

Process for production of trialkoxyhalosilanes

A process for the production of trialkoxyhalosilanes which comprises reacting a tetrahalosilane [37] with a tetra-alkoxysilane [38] in the presence of an alcohol whose alkoxy group is the same as those of the tetraalkoxysilane to thereby obtain a trialkoxyhalosilane [39], characterized in that the alcohol is used in an amount of 5 to 50% by mole based on the total amount of Si of the tetrahalosilane and the tetraalkoxysilane: SiX[37] (wherein X is halogeno) Si(OR)[38] (wherein Ris a hydrocarbon group havingtocarbon atoms) XSi(OR)[39] (wherein X and Rare each as defined above).

The invention has an object to provide a catalyst for polymerizing or copolymerizing an &#x3b1;-olefin, catalyst constituent thereof, and method of polymerizing &#x3b1;-olefins with the catalyst, for production of &#x3b1;-olefin polymers or copolymers with high hydrogen response, high polymarization reaction rate, high stereoregularity and excellent melt fluidity. The invention discloses a catalyst constituent of the catalyst for polymerizing or copolymerizing an &#x3b1;-olefin, represented by Formula 37 or 38:Si(OR)(NRR)Formula 37(where in Formula 37, Ris a hydrocarbon group with 1 to 6 carbon atoms; Ris a hydrocarbon group with 1 to 12 carbon atoms or hydrogen; and Ris a hydrocarbon group with 1 to 12 carbon atoms)RNSi(OR)Formula 38(where in Formula 38, Ris a hydrocarbon group with 1 to 6 carbon atoms; and RN is a cyclicl amino group).

Catalysts for polymerization or copolymerization of &#x3b1;-olefins, catalyst components thereof, and processes for polymerization of &#x3b1;-olefins with the catalysts

An olefin polymerization catalyst comprising: (A1) a solid catalyst component prepared by contacting (a1) a dialkoxymagnesium, (b1) a tetravalent titanium halide, (c1) an electron compound, and (d1) a polysiloxane, (B) an organoaluminum compound of the formula RAlQ, and (C) an aminosilane compound of the formula (RRN)Si(OR)has a high activity to hydrogen as compared with conventional catalysts and maintains the capability of producing polymers with a high stereoregularity at a high yield.

Olefin polymerization catalyst

A vertical magnetic recording medium excellent in durability and recording property in which a first magnetic film comprising Co--Cr or Co--Cr--W as the main ingredient is formed on a substrate and the second magnetic film comprising Co--Cr--W--C as the main ingredient is formed on the first magnetic film, as well as the production process therefor are provided.

Vertical magnetic recording medium and method of manufacturing the same

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Ichihara, Japan

Motozo Yoshikiyo