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Production method of magnetic carrier and magnetic carrier produced therewith

  • US 8,323,726 B2
  • Filed: 10/07/2010
  • Issued: 12/04/2012
  • Est. Priority Date: 06/19/2009
  • Status: Expired due to Fees
First Claim
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1. A method for producing a magnetic carrier, comprising coating a surface of magnetic carrier core particles with resin composition particles by a mechanical impact force to produce a magnetic carrier coated with a resin composition, whereinthe coating is conducted by the use of a coating apparatus comprising a rotor having at least a plurality of stirring members on a surface thereof, a driver for driving the rotor by rotation, and a body casing disposed with a gap from the stirring members;

  • the resin composition particles has a 50% particle diameter (D50) based on volume of from 0.2 μ

    m or more to 6.0 μ

    m or less and the proportion of particles of 10.0 μ

    m or more is 2.0% by volume or less; and

    the magnetic carrier core particles and the resin composition particles input in the coating apparatus are, by rotating the rotor, transported by a part of the stirring members in a direction of the driver which is one direction of an axial direction of the rotor and transported by another other part of the stirring members in an anti-driver direction which is a direction reverse to the axial direction of the rotor, followed by, while repeatedly conducting the transportation in the driver direction and the transportation in the anti-driver direction, coating the surface of the magnetic carrier core particles with the resin composition particles.

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