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Title:
COATED POWDER AND PROCESS FOR THE PREPARATION THEREOF
Document Type and Number:
WIPO Patent Application WO/1999/022894
Kind Code:
A1
Abstract:
A highly functional coated powder which can be prepared not by a process comprising the hydrolysis of a metal alkoxide but by a process which can be conducted without an expensive metal alkoxide and a highly flammable organic solvent and dispense with explosion-proof facilities, is facilitated in the control of temperature and humidity, and therefore permits lowering in the production cost as a whole; and a process for the preparation thereof. The coated powder is composed of substrate particles each covered with one or more films of which at least one is a film formed from a metal salt through a reaction in an aqueous solvent under the condition of constant pH. The process does not cause the precipitation of a solid in a free state (not adhering to the particle) in the liquid phase, and can give a uniform solid film on the surface of each substrate particle, while inhibiting the particles from causing aggregation.

Inventors:
Nakatsuka, Katsuto (3-5-1403, Moniwadai 4-chome Taihaku-ku Sendai-shi Miyagi, 982-0252, JP)
Atarashi, Takafumi (Nittetsu Mining Co, Ltd. 8-1, Oaza Hirai Hinode-machi Nishitama-gun Tokyo, 190-0182, JP)
Kishimoto, Akira (Nittetsu Mining Co, Ltd. 8-1, Oaza Hirai Hinode-machi Nishitama-gun Tokyo, 190-0182, JP)
Application Number:
PCT/JP1998/004880
Publication Date:
May 14, 1999
Filing Date:
October 28, 1998
Export Citation:
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Assignee:
NITTETSU MINING CO., LTD. (3-2 Marunouchi 2-chome Chiyoda-ku Tokyo, 100-0005, JP)
Nakatsuka, Katsuto (3-5-1403, Moniwadai 4-chome Taihaku-ku Sendai-shi Miyagi, 982-0252, JP)
Atarashi, Takafumi (Nittetsu Mining Co, Ltd. 8-1, Oaza Hirai Hinode-machi Nishitama-gun Tokyo, 190-0182, JP)
Kishimoto, Akira (Nittetsu Mining Co, Ltd. 8-1, Oaza Hirai Hinode-machi Nishitama-gun Tokyo, 190-0182, JP)
International Classes:
B01J2/00; B22F1/02; C23C18/12; C23C22/58; C23C24/08; C23C26/00; (IPC1-7): B22F1/02
Attorney, Agent or Firm:
Hagino, Taira (Eikoh Patent Office ARK Mori Building, 28th floor 12-32, Akasaka 1-chome Minato-ku Tokyo, 107-6028, JP)
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