FERRITE PARTICLES AND ELECTROPHOTOGRAPHIC CARRIER AND ELECTROPHOTOGRAPHIC DEVELOPER USING SAME
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United States of America Patent
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Issued Date -
Jan 16, 2014
app pub date -
Mar 19, 2012
filing date -
Mar 24, 2011
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Abandoned
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Abstract
A material expressed as a composition formula MXFe3-XO4 (where M is at least one of Mg and Mn, and 0≦X≦1) is a main component, and as a total amount, 0.1 to 2.5 weight percent of at least one of a Sr element and a Ca element is contained. Here, when ferrite particles are used as a carrier, in terms of obtaining a higher image density, the fluidity of the ferrite particles magnetized under a magnetic field of 1000/(4π) kA/m (1000 oersteds) is preferably 40 seconds or more. The residual magnetization σr is preferably 3 Am2/kg or more.
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