Method for using hard magnetic carriers in an electrographic process
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United States of America Patent
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Apr 20, 2004
Grant Date -
Feb 28, 2002
app pub date -
May 11, 2001
filing date -
May 17, 2000
priority date (Note) -
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Abstract
Methods for development of an electrostatic image are disclosed that utilize developer compositions with hard magnetic carrier compositions which can provide improved development efficiencies and reduced amounts of image carrier pick-up. The methods utilize hard magnetic carrier particles that are modified to have specific levels of resistivity, such as, for example, of from about 1.times.10.sup.5 ohm-cm to about 1.times.10.sup.10 ohm-cm, and a carrier charge-to-mass of greater than about 1.0 .mu.C/g, which carriers can provide greater development speeds without unacceptable levels of image carrier pick-up. In embodiments, the hard magnetic materials are doped, i.e., bulk substituted, with multi-valent metals to adjust resistivity, while in other embodiments, the hard magnetic materials are coated with at least one multi-valent metal oxide.
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