spherical silica fine powder and spherical silica for developing an electrostatic latent image toner external additive using a fine powder

摘要

Excellent spacer effect, without causing a poor image even in an image forming of repetition, stability to provide a suitable toner external additive to prepare the toner of the printing characteristics. Also it provides a suitable spherical silica fine powder for addition to such a toner external additive. Is the average particle diameter measured by a laser diffraction scattering particle size distribution analyzer is less than 0.090 m 0.140 m, 25.0 mass particle size of the particles content of more than 0.150 m 5.0 mass% or more % or less, spherical silica fine powder having a particle size wherein the particle content of more than 0.300 m is 1.0% by mass or less. Laser diffraction scattering particle size particle diameter measured by a distribution analyzer is 0.050 m or less of the particle content of 0.5 mass% or less, the following particle content of 0.080 m particle size exceeding 0.050 m 1 It is preferably 2.0% by mass than 15.0 mass% or less.