Sumitomo Chemical Company, Limited

Other

Sumitomo Chemical Companylimited

Yoshiaki Takeuchi

Hironobu Koike

Yasuyuki Oki

Hajime Maki

Kazuhisa Kajihara

Hiroshi Umezaki

Koji Yamamoto

Yoshiaki Sakatani

Kazumasa Ueda

Yasushi Teshima

Shoji Sugimoto

Masamichi Inui

Takahiro Ishida

Yuzuru Saitou

Makio Kimura

The present invention provides a fine &#x3b1;-alumina particle having a degree of &#x3b1;-transformation of not less than 95%, a BET specific surface area of not less than 10 m/g, a degree of necking of not more than 30%, and a total content of Si, Fe, Cu, Na and Mg of not more than 500 ppm.

Fine &#x3b1;-alumina particle

The present invention provides a method of producing an &#x3b1;-alumina particle. The method of producing an &#x3b1;-alumina particle comprises steps of:

Method for producing alpha-alumina particle

The present invention provides a method for producing an &#x3b1;-alumina particle. The method for producing an &#x3b1;-alumina particle comprises steps of: (1) placing a powdery mixture containing an aluminum salt and a seed crystal under a circumstance at not less than pyrolysis temperature of the aluminum salt, and (2) calcining the resultant.

Method for producing an alpha alumina particle

A method for producing an &#x3b1;-alumina powder is provided. T method for producing an &#x3b1;-alumina powder comprising steps of:

Method for producing an &#x3b1;-alumina power

The present invention provides a process for producing fine &#x3b1;-alumina particles, which comprises sintering a mixture of &#x3b1;-alumina precursor particles and seed crystal particles, wherein a center particle diameter of the seed crystal particles is 40 nm or less, and a ratio of the number of coarse particles having a particle diameter greater than 100 nm to the number of the total particles is 1% or less.

Process for producing fine &#x3b1;-alumina particles

A coating composition, a method for producing the coating composition, a coating film and magnetic recording medium are described. The coating composition comprises a binder, a solvent, and an &#x3b1;-alumina powder, wherein the &#x3b1;-alumina powder satisfies the following (a) and (b):

Coating composition and method for producing the same

A method for producing an &#x3b1;-alumina powder is described. The method for producing an &#x3b1;-alumina powder comprises a step of calcining an aluminum salt in the presence of a seed crystal at 600-890&#xb0; C.

Method for producing &#x3b1;-alumina powder

A method for producing an &#x3b1;-alumina particulate is described. The method for producing an &#x3b1;-alumina particulate comprises steps of (Ia) and (Ib), or a step of (II):

Method for producing &#x3b1;-alumina particulate

A method for producing &#x3b1;-alumina powder is described. The method comprises the steps of removing water from a compound containing the following (1), (2), (3) and (4), and calcining the results:

An inorganic oxide powder is produced by a method which comprises a step of (i) introducing, into a dry-way pulverizer, an inorganic oxide in an amount of 100 parts by volume and air, nitrogen or a gas mixture thereof in an amount of from about 25,000 to about 160,000 parts by volume to pulverize the inorganic oxide by the dry-way pulverizer, or (ii) introducing, into a medium-stirring-type pulverizer, an inorganic oxide with a BET specific surface area of from about 1 to about 70 m/g to pulverize the inorganic oxide by the medium-stirring-type pulverizer in a dry way at a specific energy consumption of from about 0.3 to about 1 kWh/kg. The inorganic oxide powder is capable of providing a ceramic with high density and high mechanical strength.

Method for producing an inorganic oxide powder

Titanium oxide, photocatalyst comprising same and photocatalytic coating agent

Acid resistant catalyst sheet and process for producing same

There are provided (i) a heat resistant catalyst sheet having an aramid fiber and a catalyst component-containing titania fiber; and (ii) a process for producing a heat resistant catalyst sheet, which has the step of making paper from a mixture of an aramid fiber and a catalyst component-containing titania fiber.

Heat resistant catalyst sheet and process for producing same

The present invention provides a porous titania, which has an anatase-form crystalline structure, an anatase-form crystallite diameter of 3 nm to 10 nm, a degree of anatase crystallinity of 60% or more, a BET specific surface area of 10 m /g or more, a total pore volume of 0.05 cm /g or more, and a volume for pores having a pore radius of 1 nm or more of 0.02 cm /g or more, and the porous titania and the catalyst comprising the porous titania of the present invention exhibit an excellent catalytic activity for removal of nitrogen oxides, oxidation of organic substances, decomposition of dioxine compounds, as well as decomposition and removal of organic solvents, agricultural chemical and surfactant.

Porous titania, catalyst comprising the porous titania

The present invention provide a boehmite in which (i) a crystallite diameter in the direction perpendicular to the plane ( ) is about 65 angstrom or longer and (ii) a ratio of a crystallite diameter in the direction perpendicular to the plane ( ) to a crystallite diameter in the direction perpendicular to the plane ( ) is about 1.8 or more. By using the boehmite as a non-magnetic pigment, a base coat layer for magnetic recording medium having an excellent surface smoothness can be obtained.

Growing community of inventors

Niihama, Japan

Yoshiaki Takeuchi