Shin-Etsu Chemical Co., Ltd.

Kumiai Chemical Industry Co., Ltd.

Toshio Shinohara

Susumu Ueno

Mikio Aramata

Tetsuya Inukai

Yoichi Tanifuji

Muneo Kudo

Koichi Ito

Motoaki Iwabuchi

Yasushi Yamamoto

Shigeshi Toyoshima

Ryuichi Sato

Masatoshi Arai

Kazuyuki Matsumura

Hajime Ishizaka

Minoru Takamizawa

Shoji Ichinohe

Kunio Itoh

Masaaki Furuya

Akio Yokoo

Akio Muraida

Toshinobu Ishihara

Tadashi Amano

Tohru Kubota

Masaharu Takahashi

Mikio Endo

Yoshifumi Inoue

Hideshi Kurihara

Kazutoshi Fujioka

Yoshihiro Shirota

Takashi Kobayashi

Tohru Nishikawa

Akio Ohori

Takeo Yoshida

Hirofumi Fukuoka

Masahiko Ogawa

Hiroaki Kizaki

Yoshitaka Okuno

Masao Maruyama

Makoto Satoh

Yukinori Satou

Tomohisa Suzuki

Nobuyuki Suzuki

Shoichi Tanaka

Hideaki Ozeki

Masatoshi Hayashi

Kazunobu Umemura

Kenichi Kojima

Tasuku Tanino

Fumiaki Mori

Kiyoyuki Takano

Hisashi Konishi

In a Rochow process, organohalosilanes are prepared by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst and a co-catalyst. The invention uses as the co-catalyst a powder of co-catalyst active element-copper alloy containing substantial strain energy because this co-catalyst can reduce the activation time taken until a steady state is reached, which has been an outstanding problem in Rochow reaction, maintain the steady state over time and increase the selectivity of desired diorganodihalosilane for eventually increasing the yield based on the starting silicon.

Co-catalyst and process for the preparation of organohalosilanes

In an industrial process for preparing organohalosilanes by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst, a contact mass composed of the metallic silicon and the catalyst further contains an effective amount of a phosphine chalcogenide compound. The invention drastically increases the silane formation rate and the utilization of silicon without lowering the selectivity of useful silane.

Preparation of organohalosilanes

In an industrial process for preparing organohalosilanes by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst, a contact mass composed of the metallic silicon and the catalyst further contains an effective amount of a phosphonium compound having on the molecule at least one group of the formula: &lsqb;R R R P&mdash;&rsqb; Y wherein R , R and R each are a monovalent hydrocarbon group and Y is a halogen atom or acid group. The invention drastically increases the silane formation rate and the utilization of silicon without lowering the selectivity of useful silane.

In the synthesis of organohalosilanes by the direct process of reacting an organic halogen with metallic silicon powder, a metallic copper catalyst in the form of a thermally active metallic copper powder having large strain energy is used.

Metallic copper catalyst and process for making organohalosilanes

In a process for preparing oganohalosilanes by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst, a contact mass composed of the metallic silicon and the catalyst further contains a minute, but effective amount of a catalytic metal powder which has been produced by an atomizing technique. The process is successful in drastically increasing a formation rate without lowering the selectivity of useful silane.

When oganohalosilanes are prepared by charging a reactor with a contact mass containing a metallic silicon powder, a copper catalyst and a co-catalyst, and introducing an organohalide-containing gas into the reactor to effect the direct reaction, the catalyst and/or co-catalyst used in the contact mass is obtained by mixing particles of the catalyst and/or co-catalyst with finely divided silica, and applying shear forces to the mixture for mutually rubbing the particles, thereby producing the catalyst and/or co-catalyst having finely divided silica fused to surfaces thereof. The invention is successful in producing organohalosilanes at a significantly improved formation rate without reducing the proportion of diorganodihalosilane.

Organohalosilanes are prepared by reacting an organic halide with metallic silicon particles in the presence of a metallic copper catalyst which is a metallic copper powder in flake form having a bulk specific gravity of 1-3 g/cm and a mean particle size of 10 &mgr;m to 1 mm as measured by laser diffraction particle size distribution analysis.

Metallic copper catalyst and process for the synthesis of organohalosilanes

When oganohalosilanes are prepared by charging a reactor with a contact mass containing a metallic silicon powder and a copper catalyst, and introducing an organohalide-containing gas into the reactor to effect the direct reaction, a poly(organo)phosphino compound is added to the contact mass. The invention is successful in producing organohalosilanes at a significantly improved production rate without reducing the selectivity of useful silane.

Organohalosilanes are prepared by the Rochow process of reacting metallic silicon particles with an organohalide in the presence of a copper catalyst. The metallic silicon particles, which are prepared by committing fragments of metallic silicon raw material, have a mean particle size of 10 &mgr;m to 10 mm and a surface oxygen quantity of at least 0.05 wt % and/or at least 0.001 g of oxygen/m,of silicon surface area, which is given as the difference between the oxygen concentrations determined by in-metal oxygen analysis of the metallic silicon particles and the fragments, respectively. On analysis, the metallic silicon particles have been held for at least 3 hours in an air atmosphere at 25&deg; C. and RH 55%

Process for preparing organohalosilanes

Organohalosilanes are prepared by the Rochow process of reacting metallic silicon particles with an organohalide in the presence of a copper catalyst. The metallic silicon particles, which are prepared by comminuting fragments of metallic silicon raw material, have a mean particle size of 10 &mgr;m to 10 mm and a surface oxygen quantity of up to 0.3 wt % which is given as the difference between the oxygen concentrations determined by in-metal oxygen analysis of the metallic silicon particles and the fragments, respectively.

When oganohalosilanes are prepared by charging a reactor with a contact mass containing a metallic silicon powder and a copper catalyst, and introducing an organohalide-containing gas into the reactor to effect the direct reaction, a metal complex of an organophosphino compound is added to the contact mass. The invention is successful in producing organohalosilanes at a significantly improved production rate without reducing the selectivity of useful silane.

A contact mass for use in the synthesis of organohalosilanes is prepared by adding metallic copper particles to metallic silicon particles, and rubbing the particles against each other under high shear forces in a non-oxidizing atmosphere, thereby forming a metallic copper thin film on the surface of the metallic silicon particles in a spot pattern or entirely. The contact mass is capable of reducing the time required for activation and has an extended lifetime.

Method for preparing contact mass for organohalosilane synthesis

Novel 1,1,2,2-tetramethylpropylperoxy esters are provided. They are useful as a polymerization initiator in polymerizing vinyl chloride, vinylidene chloride and vinyl acetate monomers, with the advantage of completing polymerization within a short time.

1,1,2,2-tetramethylpropylperoxy esters and method for preparing vinyl

Silicon-containing peroxyester compounds, for example, represented by the following formula: ##STR1## useful as a polymerization initiator, which compounds can produce vinyl chloride polymers having a high quality in a high yield and in a short reaction time.

Silicon-containing peroxyesters

A silicone rubber composition comprising an organopolysiloxane and a reinforcing silica filler can be improved in crepe hardening and shelf stability by blending a specific compound as a wetter.

Silicone rubber compositions

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Annaka, Japan

Toshio Shinohara