Carrier core particles for electrophotographic developer, carrier for electrophotographic developer, and electrophotographic developer
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United States of America Patent
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May 19, 2015
Grant Date -
Dec 26, 2013
app pub date -
Mar 1, 2012
filing date -
Mar 16, 2011
priority date (Note) -
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Abstract
The carrier core particles for electrophotographic developer have a volume size distribution with a median particle size ranging from 30 μm to 40 μm, the ratio of the carrier core particles having a diameter of 22 μm or lower in the volume size distribution is from 1.0% to 2.0%, the ratio of the carrier core particles having a diameter of 22 μm or lower in a number size distribution is 10% or lower, and the magnetization of the carrier core particles in an external magnetic field of 1000 Oe is from 50 emu/g to 75 emu/g.
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