External additive for toner for electrophotography, toner...

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

Reexamination Certificate

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C430S108300, C430S108600, C430S123510, C106S426000, C106S446000, C106S450000, C106S454000, C106S457000, C106S466000, C106S470000, C106S479000, C106S480000, C106S482000, C106S483000, C106S490000, C423S327100, C423S331000, C423S335000

Reexamination Certificate

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07611815

ABSTRACT:
An external additive for a toner for electrophotography which contains oxide fine particles which contain silicon, in which the oxide fine particles have a primary particle diameter of 30 nm to 300 nm in number average, a standard deviation σ of a particle size distribution of the primary particle diameter satisfies a relation of: R/4≦σ≦R, in which the R expresses the primary particle diameter,the oxide fine particles are substantially spherical having a circularity SF1 defined as equation (1) of 100 to 130 and a circularity SF2 defined as equation (2) of 100 to 125;in-line-formulae description="In-line Formulae" end="lead"?SF1=(L2/A)×(π/4)×100  equation (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?SF2=(P2/A)×(1/4π)×100  equation (2),in-line-formulae description="In-line Formulae" end="tail"?in the equations, “L” expresses the absolute maximum length of the oxide fine particles; “A” expresses a projected area of the oxide fine particles; and “P” expresses a maximum perimeter of the oxide fine particles.

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