Carrier core material for electrophotographic developer, method for manufacturing the same, carrier for electrophotographic developer and electrophotographic developer
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United States of America Patent
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Oct 20, 2015
Grant Date -
Aug 16, 2012
app pub date -
Jun 28, 2010
filing date -
Jun 29, 2009
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Abstract
There is provided a carrier core material for electrophotographic developer containing a soft ferrite, expressed by (MgXMn1−X)Fe2O4 (wherein X is in a range of 0.1≦X<1.), wherein an analysis value of P on the surface of the carrier core material is 0.1 mass % or more, an analysis value of Mg is 2 mass % or more, a content of Mg on the surface of the carrier core material is 2 mass % or more by EDS, and when the content of Mg in the carrier core material is expressed by M1, and the analysis value of Mg on the surface of the carrier core material by EDS is expressed by M2, a value of M2/M1 exceeds 1.0.
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