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Developer composition for non-interactive magnetic brush development

  • US 20030099896A1
  • Filed: 11/29/2001
  • Published: 05/29/2003
  • Est. Priority Date: 11/29/2001
  • Status: Abandoned Application
First Claim
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1. A method for developing an electrostatic image comprising contacting the image with at least one magnetic brush comprising (a) a rotating magnetic core of a preselected magnetic field strength, (b) an outer nonmagnetic shell, (c) means for reducing bead chaining of carrier particles, and (d) an electrographic, two-component dry developer composition comprising charged toner particles and oppositely charged soft ferrite carrier particles exhibiting (i) a coercivity of less than 500 gauss when magnetically saturated sufficient to cause said developer to flow circumferentially on said shell in a direction opposite the direction of magnetic core rotation and (ii) an induced magnetic moment of less than 25 EMU/gm when in an externally applied field of 1000 gauss, and which magnetic moment is sufficient to prevent said carrier from transferring to said electrostatic image, said toner and carrier particles in said developer having a triboelectric force of attraction which is greater than the magnetic force of attraction between carrier particles in said developer.

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