FINE SPHERICAL SILICA POWDER AND ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER EXTERNAL ADDITIVE USING THE FINE SPHERICAL SILICA POWDER
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United States of America Patent
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Jan 28, 2014
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Jul 29, 2011
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Abstract
Provided is a suitable toner external additive which has an excellent spacer effect, without causing image defects in repeated image formation and which is suitable in preparing a toner with stable printing properties and to provide a fine spherical silica powder suitable for adding to the toner additive. A fine spherical silica power having an average particle size measured by a laser diffraction/scattering distribution measuring apparatus of 0.090 μm or more and 0.140 μm or less, a particle content ratio of 5.0% by mass or more and 25.0% by mass or less when the particle diameter is 0.150 μm or more, and a particle content ratio of 1.0% by mass or less when the particle diameter is 0.300 μm or more.
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