| abstract |
PROBLEM TO BE SOLVED: To maintain good fluidity by suppressing embedding in toner particles when used as an external toner additive for electrophotography, to prevent filming phenomenon due to defective scraping of a cleaning blade, and to charge the toner Provided is a silica fine particle in which the variation of the above is suppressed. In a silica fine particle obtained by combustion of a silicon compound, the average particle size is in the range of 0.05 μm or more and less than 0.1 μm, and the value of the gradient n of the particle size distribution displayed by the rosin-Rammler diagram is 2 or more. Silica fine particles containing no molten particles of 1 μm or more as measured by a laser diffraction / scattering method [Selection figure] None |