Toda Kogyo Corporation

Minoru Yamasaki

Katsumi Yamashita

Hideaki Sadamura

Kenji Okinaka

Junichi Kawano

Masaaki Hamano

Masayuki Uegami

Yasutaka Ota

Akihisa Kajiyama

Seiji Okazaki

Kohji Mori

Akio Mishima

Hirofumi Kawasaki

Shoichi Fujino

Katsunori Fujimoto

Wataru Oda

Ryuta Masaki

Akira Takeuchi

Daisuke Morita

Akino Sato

Toshiaki Hiramoto

Manabu Matsumoto

Toshitada Shigemura

Kunihiro Kouchi

Yuji Omote

Tetsuya Kodaira

Hirotaka Mizuguchi

Takayuki Yamamura

Katsuhiro Fujita

Masashi Kobino

Hiroki Kamon

Akihisa Indue

Akino Ito

The present invention relates to nickel-cobalt-manganese-based compound particles which have a volume-based average secondary particle diameter (D50) of 3.0 to 25.0 &#x3bc;m, wherein the volume-based average secondary particle diameter (D50) and a half value width (W) of the peak in volume-based particle size distribution of secondary particles thereof satisfy the relational formula: W&#x2266;0.4&#xd7;D50, and can be produced by dropping a metal salt-containing solution and an alkali solution to an alkali solution at the same time, followed by subjecting the obtained reaction solution to neutralization and precipitation reaction. The nickel-cobalt-manganese-based compound particles according to the present invention have a uniform particle size, a less content of very fine particles, a high crystallinity and a large primary particle diameter, and therefore are useful as a precursor of a positive electrode active substance used in a non-aqueous electrolyte secondary battery.

Nickel-cobalt-maganese-based compound particles and process for producing the nickel-cobalt-manganese-based compound particles, lithium composite oxide particles and process for producing the lithium composite oxide particles, and non-aqueous electrolyte secondary battery

Lamellar rare earth-iron-boron-based magnet alloy particles for a bonded magnet, having an intrinsic coercive force (iHc) of not less than 3.5 kOe, a residual magnetic flux density (Br) of not less than 9.5 kG, and a maximum energy product ((BH) ) of not less than 13 MGOe. These particles have an average major axial diameter of 60 to 500 &mgr;m, an average minor axial diameter of 50 to 460 &mgr;m, an average axis ratio (major axial diameter/minor axial diameter) of 1.1 to 10 and an average aspect ratio (major axial diameter/thickness) of 3 to 100. The magnet alloy particles have a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a maximum energy product ((BH) ) as large as not less than 13 MGOe, are used as a material for high-performance bonded magnets.

Lamellar rare earth-iron-boron-based magnet alloy particles, process for producing the same and bonded magnet produced therefrom

Cobalt-coated acicular magnetic iron oxide particles of the present invention have an average major axial diameter of 0.15 to 0.50 .mu.m, and comprise:

Cobalt-coated acicular magnetic iron oxide particles

A rare earth bonded magnet obtained by mixing two types of magnetic powders (A) and (B) in the present invention has a high residual magnetic flux density (Br), a large intrinsic coercive force (iHc) and a large maximum energy product ((BH)max) in spite of a low rare earth element content, and shows an excellent rust preventability. A rare earth-iron-boron type magnet alloy of the present invention has a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a large maximum energy product ((BH)max) and which has an excellent rust preventability.

Rare earth bonded magnet and rare earth-iron-boron type magnet alloy

The disclosure describes a process for producing Co-coated acicular magnetite particles each comprising: acicular magnetite particle as the core particle; a lower coating layer of Co-containing spinel ferrite having a spinel structure, which is formed on the surface of said acicular magnetite particle; and an upper coating layer of Co- and Mg-containing spinel ferrite having a spinel structure, which is formed on said lower coating layer.

Process for producing co-coated acicular magnetite particles

Co-coated acicular magnetite particles each comprising: acicular magnetite particle as the core particle; a lower coating layer of Co-containing spinel ferrite having a spinel structure, which is formed on the surface of said acicular magnetite particle; and an upper coating layer of Co- and Mg-containing spinel ferrite having a spinel structure, which is formed on said lower coating layer.

Co-coated acicular magnetite particles and process for producing the same

Disclosed herein are granulated particles for magnetic particles for magnetic recording, comprising: acicular ferric hydroxide oxide particles or acicular iron oxide particles; and at least one selected from the group consisting of semisynthetic starch and semisynthetic cellulose and having a bulk density of not less than 0.3 g/cm.sup.3 and a powdering ratio of not more than 40%, and a process for producing the granulated particles, and magnetic particles obtained from such granulated particles.

Granulated particles for magnetic particles for magnetic recording, and

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Yamaguchi-ken, Japan

Minoru Yamasaki