Tosoh Corporation

Toyo Soda Manufacturing Co., Ltd.

Kazuaki Yamamoto

Junji Arika

Nobuhiro Ogawa

Masaru Takitani

Hajime Funakoshi

Takashi Mori

Keiji Mitarai

Atsushi Harada

Yoshinori Shirakura

Takayuki Shoji

Shunsuke Yatsunami

Kimitaka Kuma

Ryoji Yoshimura

Takashi Mouri

Chikara Uema

Eiji Shiota

A lithium-manganese complex oxide represented by a formula Li&lsqb;Mn Li M &rsqb;O (wherein M is at least one element selected from the groups IIa, IIIb and VIII of the 3rd and 4th periods, and 0.02&lE;X&lE;0.10, 0.05&lE;Y&lE;0.30 and &minus;0.2&lE;&dgr;<0.2), having a spinel crystalline structure of 0.22&deg; or less of half value width of the (400) plane of powder X-ray diffraction by CuK&agr; and an average diameter of crystal grains by SEM observation of 2 &mgr;m or less, and a spinel crystalline structure lithium-manganese complex oxide having a BET specific surface area of 1.0 m &middot;g or less; production methods thereof; and a lithium secondary battery which uses the lithium-manganese complex oxide as the positive electrode active material are described.

Lithium-manganese complex oxide, production method thereof and use thereof

A novel heat-resistant low-silica zeolite, an industrial production process, and uses of the low-silica zeolite are provided. The heat-resistant low-silica zeolite contains Si and Al in a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 ranging from 1.9 to 2.1, and has sodium and/or potassium as metal cation, wherein the low-silica zeolite contains low-silica faujasite type zeolite at a content of not lower than 88%, and has a thermal decomposition temperature ranging from 870.degree. C. to 900.degree. C. in the air. The process for producing the heat-resistant low-silica zeolite comprises mixing a solution containing an aluminate with another solution containing a silicate, allowing the resulting mixture to gel, and aging the resulting gel, at the temperature of from 0.degree. C. to 60.degree. C., to prepare a slurry having a viscosity ranging from 10 to 10000 cp and containing amorphous aluminosilicate having a specific surface area of not less than 10 m.sup.2 /g with an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio ranging from 1.9 to 2.1; and subsequently crystallizing the aluminosilicate. The low-silica zeolite ion-exchanged with lithium or an alkaline earth metal is useful for gas separation.

Heat-resistant low-silica zeolite, and process for production and

An ITO sintered body according to the present invention has a density thereof of between 90 and 100% and a sintering particle size of between 1 and 20 .mu.m. A proportion of (In.sub.0.6 Sn.sub.0.4).sub.2 O.sub.3 in the ITO sintered body is 10% or below. Such an ITO sintered body is manufactured by mixing an indium oxide powder, whose BET surface area is between 15 and 30 m.sup.2 /g, a BET size/a crystallite size is 2 or below, and an average primary particle size is between 0.03 and 0.1 .mu.m, with tin oxide whose BET surface area is 3 m.sup.2 /g or below, and then by sintering the mixture.

Ito sintered body and method of manufacturing the same

A spherical micro-porous silica gel, which is characterized by having a mean diameter of 3-20 .mu.m, a bulk density of 0.28-0.41 g/cm.sup.3, a pore size of 18,000-100,000 and a specific surface area of 1,000-1,400 m.sup.2 /g and a production process therefor is characterized by employing (a) an aqueous solution containing SiO.sub.2 in which the primary particle diameter is not larger than 6 nm and the molar ratio of SiO.sub.2 to Na.sub.2 O is not larger than 5.5, (b) either stearic acid or a mixture of stearic acid and a non-ionic surface active agent of which HLB ranges from 3.5 to 6.0 as an emulsifier and (c) an organic acid as a gelling agent.

Spherical micro-porous silica gel and a production process thereof

Chain structured corpuscular calcium carbonate is produced by a carbonation of calcium hydroxide suspended in water in the presence of a chelating agent and a water soluble metal salt.

Process for producing chain structured corpuscular calcium carbonate

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Tokuyama, Japan

Kazuaki Yamamoto