Patent ID: 9606462
Date: 2017-03-28
CPC Classifications: G03G

Claim:
1. A toner comprising a toner particle containing a binder resin, a colorant and a releasing agent, and an external additive containing (i) an organic-inorganic composite fine particle having a number average particle diameter (D1) of 50-500 nm and a shape factor SF-2 of 103-120 as measured at a magnification of 200,000, and (ii) an inorganic fine particle A having a BET specific surface area of 50-400 m 2 /g, wherein the organic-inorganic composite fine particle: (1) comprises a resin particle and an inorganic fine particle B which is embedded in the resin particle, and has a surface with a convex portion derived from the inorganic fine particle B; (2) has a proportion Y (parts by mass) of a particle firmly fixed to the toner particle of 0.45 to 3.00 parts by mass with respect to 100 parts by mass of the toner particle; and (3) X-Y≦0.30 when a content proportion of the organic-inorganic composite fine particle is X parts by mass with respect to 100 parts by mass of the toner particle; the organic-inorganic composite fine particle has a unit diffusion index of 0.75 or more on the toner particle surface when unit diffusion index=(organic-inorganic composite fine particle coverage ratio on toner particle surface obtained from measurement)/(organic-inorganic composite fine particle coverage ratio on toner particle surface for ideal diffusion of organic-inorganic composite fine particle).