Sumitomo Metal Mining Company, Ltd.

Mabuchi Motor Co., Ltd.

Koei Chemical Company, Limited

Junichi Ishii

Isao Shibuya

Yasuhiro Yamagata

Takayuki Kurohara

Atsushi Kawamoto

Koichi Oka

Toshiya Iwai

Tetsuji Takada

Hideki Matsuda

Naoki Kitahara

Kenji Muraoka

A composition for bonded magnets according to the present invention contains from 88% by mass to 91% by mass (inclusive) of a samarium-iron-nitrogen magnet powder having an average particle diameter of from 1.8 &#x3bc;m to 2.8 &#x3bc;m (inclusive), from 0.5% by mass to 2.5% by mass (inclusive) of a polyamide elastomer having a tensile elongation at break of 400% or more and a bending modulus of elasticity of 100 MPa or more, from 0.5% by mass to 2.0% by mass (inclusive) of carbon fibers having fiber diameters of from 10 &#x3bc;m to 12 &#x3bc;m (inclusive) and from 0.3% by mass to 1.0% by mass (inclusive) of a carboxylic acid ester, with the balance made up of a polyamide resin which is composed of a polyamide 12 having a weight average molecular weight (Mw) of from 4,500 to 7,500 (inclusive) as determined by molecular weight distribution measurement.

Composition for bonded magnets, bonded magnet and integrally molded component

A curable resin binder comprising an epoxy resin which is a solid at room temperature, an epoxy resin curing agent which is inactive at room temperature, and as a curing accelerator, a pyridine derivative containing at least one hydroxyl group in a molecule. Also disclosed is a resin-bonded rare earth permanent magnet made by employing the binder and a powder of an alloy containing a rare earth metal or metals.

Resin bonded permanent magnet and a binder therefor

This invention is directed to a samarium-cobalt type magnetic powder for use in making a resin magnet, characterized by substantially comprising a SmCo.sub.5 single phase and consisting of, by weight, 32.7 to 33.4% samarium, 65 to 67% cobalt, not more than 1.5% as a total of lanthanum, cerium, praseodymium and neodymium and the balance inevitably entrained impurities.

Samarium-cobalt type magnet powder for resin magnet

Growing community of inventors

Ichikawa, Japan

Junichi Ishii