Surface-modified silica powder and method for producing the same, as well as toner composition for electrophotography
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United States of America Patent
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Feb 24, 2015
Grant Date -
Nov 7, 2013
app pub date -
Feb 3, 2012
filing date -
Feb 17, 2011
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Abstract
Provided by the present invention is a surface-modified silica powder, characterized in that the said powder is obtained by surface treatment of a silica powder with one or two or more of a compound (A) and with an aminosilane (B), wherein the fixing rate of the compound (A) and the aminosilane (B) is a total of 50% or more, the hydrophobic rate is 80% or more, and the triboelectrostatic charge amount is 200 μC/g or less in its absolute value. The surface-modified silica powder of the present invention can stabilize many properties including fluidity and electrostatic properties while can significantly reduce problems such as fogging and decrease in image quality without significantly deteriorating characteristics of a developing agent and so forth when this is used as an external additive.
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