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Spherical-magnetic-composite-particles

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Spherical magnetic composite particles

Details

Inventors: Hakata, Toshiyuki; Takaragi, Shigeru;
Assignee: Toda Kogyo Corporation (JP)
Primary Examiner: Le; H. Thi
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye

Disclosed are herein spherical magnetic particles comprising magnetic particles, a thermosetting resin and carbon which is derived from the thermosetting resin by carbonizing at least a part of the thermosetting resin, and having an average particle diameter of 1 to 1000 .mu.m.

DETAILED DESCRIPTION It is an object of the present invention to provide spherical magnetic composite particles which have a high strength, a large saturation magnetization and a high electric conductivity.
It is another object of the present invention to provide spherical magnetic particles which can maintain a large saturation magnetization and a high electric conductivity for a long period of time.
It is still another object of the present invention to provide spherical magnetic particles which have good packing properties, and which are easy to disperse when they are kneaded with a resin or when they are mixed with a vehicle.
To achieve these objectives, in a first aspect of the present invention, there are provided spherical magnetic particles comprising magnetic particles, a thermosetting resin and carbon which is derived from the thermosetting resin by carbonizing at least a part of the thermosetting resin, and having an average particle diameter of 1 to 1000 .
mu.
m.
In a second aspect of the present invention, there are provided spherical magnetic particles comprising magnetic particles and carbon which is derived from the thermosetting resin, and having an average particle diameter of 1 to 1000 .
mu.
m.
In a third aspect of the present invention, there is provided a process for producing spherical magnetic particles as defined in the first aspect, comprising the step of heat-treating composite particles composed of magnetic particles and a thermosetting resin at a temperature of not lower than 350.
degree.
C.
in an inert atmosphere.

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