Ferrite carrier core material and ferrite carrier for electrophotographic developer, methods for manufacturing these, and electrographic developer using the ferrite carrier
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United States of America Patent
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Jul 14, 2015
Grant Date -
Jul 4, 2013
app pub date -
Aug 29, 2011
filing date -
Jan 31, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
It is an object of the present invention to provide a ferrite carrier core material and a ferrite carrier for an electrophotographic developer, which have an excellent charging property, hardly cause carrier scattering due to cracking and chipping of the core material, and have a prolonged life, and methods for manufacturing these, and an electrophotographic developer using the ferrite carrier. For this object, the ferrite carrier core material and a ferrite carrier for an electrophotographic developer, wherein (1) the ferrite composition contains 0.5 to 2.5% by weight of Sr, and the presence amount of Sr—Fe oxides satisfies a specific conditional expression, (2) the distribution in the number of the shape factor SF-2 is in a specific range, (3) the BET specific surface area is 0.15 to 0.30 m2/g, (4) the average particle diameter D50 is 20 to 35 μm, and (5) the magnetization is 50 to 65 Am2/kg.
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