发明名称 |
Black magnetic iron oxide particles |
摘要 |
The present invention relates to black magnetic iron oxide particles comprising magnetite as a main component, wherein when the black magnetic iron oxide particles are molded into a tablet shape, an electric resistance value of the tablet in an alternating current electric field is controlled to produce an impedance of not less than 2×106 Omegacm as measured in a characteristic frequency range thereof. The black magnetic iron oxide particles according to the present invention can provide a toner capable of exhibiting a good charging performance and a uniform charging property under the high-temperature and high-humidity conditions, so that when developing an electrostatic latent image therewith, it is possible to obtain toner images having a high resolution or definition, and further the use of heavy metal elements in the black magnetic iron oxide particles can be minimized.
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申请公布号 |
US8545713(B2) |
申请公布日期 |
2013.10.01 |
申请号 |
US201013262105 |
申请日期 |
2010.03.30 |
申请人 |
IWAI RYO;KAMIGAKI MAMORU;SHIMO NOBUYA;UCHIDA NAOKI;TODA KOGYO CORPORATION |
发明人 |
IWAI RYO;KAMIGAKI MAMORU;SHIMO NOBUYA;UCHIDA NAOKI |
分类号 |
C01G49/08;G03G9/083;G03G9/087;H01F1/34;H01F1/36 |
主分类号 |
C01G49/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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