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US 12,693,608 B2Granted
Carrier core material, and electrophotographic development carrier and electrophotographic developer using same
AssigneesDowa Electronics Materials Co., Ltd., Dowa IP Creation Co., Ltd.
InventorsYuto Kamai, Shinya Sasaki, Yuki Kaneshiro
Life of this patent
Estimating the term…
Abstract
A carrier core material has a volume moment mean D [4, 3] of O. Bluntness measured with an injection type image analysis particle size distribution meter is equal to or greater than 65% and equal to or less than 80%, and the volume moment mean D [4, 3] of ISO Roundness is equal to or greater than 80% and equal to or less than 86%. In this way, it is possible to suppress development memory and carrier adherence.
Claims5
A carrier core material comprising ferrite particles,
- wherein a composition of the ferrite particle has the formula MXFe3-xO4, wherein M is Mn and x is defined such that the composition contains 35 mole percent or more and 55 mole percent or less of MnO and 45 mole percent or more and 65 mole percent or less of Fe2O3, and part thereof is substituted for 0.1 mole percent or more and 1.0 mole percent or less of SrO and 0.1 mole percent or more and 1.0 mole percent or less of SnO,
- a volume moment mean D [4, 3] of O. Bluntness measured with an injection type image analysis particle size distribution meter is equal to or greater than 65% and equal to or less than 80%, and
- a volume moment mean D [4, 3] of ISO Roundness is equal to or greater than 80% and equal to or less than 86%.
Dependencies are inferred from the claim text.