Preparation of magnetic carrier particles
First Claim
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1. A process for preparing carrier particles for use in the dry development of electrostatic charge patterns, comprising:
- contacting stainless steel particles with an aqueous solution of oxalic acid;
removing said stainless steel particles from said solution; and
rinsing the oxalic acid from said stainless steel particles.
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Abstract
Electrostatographic carrier particles with improved conductivity and stability are prepared from magnetic stainless steel particles. The particles are treated by submersion in an aqueous oxalic acid solution. The passivated stainless steel carrier particles, preferably after being first coated with a resin, may then be mixed with toner powder for electrographic dry development.
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Citations
8 Claims
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1. A process for preparing carrier particles for use in the dry development of electrostatic charge patterns, comprising:
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contacting stainless steel particles with an aqueous solution of oxalic acid; removing said stainless steel particles from said solution; and rinsing the oxalic acid from said stainless steel particles. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A process for preparing resin-coated carrier particles for use in the dry development of electrostatic charge patterns, comprising:
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contacting stainless steel particles with an aqueous solution of oxalic acid; removing said stainless steel particles from said solution; rinsing the oxalic acid from said stainless steel particles; mixing said stainless steel particles with an amount of powdered resin; and heating said mixture to fuse the resin to said stainless steel particles.
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8. The process as described in claim 17, wherein said amount of resin is between 0.05 and 0.30 weight percent resin.
Specification