Mitsubishi Chemical Corporation

Mitsubishi Kasei Corporation

Kimmon Manufacturing Co., Ltd. and Mitsubishi Chemical Corporation

Akira Utsunomiya

Yoshio Katsuro

Hozumi Endo

Kazumi Kimura

Masaru Shimoyama

Akihiro Takazawa

Hiroshi Ota

Takashi Yamaguchi

Koji Shima

Hanako Kato

Tsuneo Kimura

Hajime Onoda

Tsugio Kaneko

Yasushi Tsurita

Michihiro Ikeda

Hiroaki Nagai

Shoji Oishi

Takanobu Katsuki

Shun Saito

Yuka Ohno

Takashi Moriyama

Toshifumi Yoshikawa

Lithium managanese oxide, cathode material for lithium secondary battery, cathode, lithium secondary battery and process for manufacturing lithium manganese oxide

A synthetic quartz powder obtained by calcining a powder of silica gel, characterized in that white devitrification spots having sizes of larger than 20 &mgr;m in diameter formed in an ingot obtained by vacuum melting the synthetic quartz powder at a temperature of from 1780 to 1800&deg; C. to form an ingot, followed by maintaining the ingot at a temperature of 1630&deg; C. for 5 hours, are at most 10 spots/50 g.

Silica gel, synthetic quartz glass powder and shaped product of quartz glass

Process for producing a high purity synthetic quartz

Process for producing synthetic quartz glass powder

Silica gel, synthetic quartz glass powder, quartz glass shaped product

A synthetic silica glass powder obtained by calcining a silica gel powder obtained by hydrolysis of a tetraalkoxysilane, said synthetic silica glass powder containing from 1.times.10.sup.-1 to 1.times.10.sup.-4 ppm of boron and having an internal silanol group concentration of at most 150 ppm and an isolated silanol group concentration of at most 5 ppm.

Synthetic silica glass powder

Synthetic quartz glass powder is produced by (a) hydrolyzing an alkoxysilane to form a gel, (b) finely dividing the gel and then drying, or drying the gel and then finely dividing, and (c) calcining the obtained powder, the powder being maintained under an atmosphere with an oxygen concentration of not less than 30 vol % during at least a part of the calcining period at a temperature of not lower than 1,000.degree. C.

A silica glass powder suitable for the production of a silica glass body product of a low silanol content, which is obtained by baking a dried silica gel powder obtained by a sol-gel method, at a temperature of from 1,000.degree. to 1,400.degree. C., wherein during the baking period, the silica gel powder is baked in a gas atmosphere containing from 10 to 100% by volume of steam for at least 5 hours.

Silica glass powder and a method for its production and a silica glass

A process for producing a ceramic preform, which comprises mixing an alkoxysilane and fine silica powder, molding the mixture, followed by heating for de-alcoholysis.

Process for producing a ceramic preform

Growing community of inventors

Kitakyushu, Japan

Akira Utsunomiya