Toner and method for manufacturing toner

摘要

To provide a toner from which an image having a stable image density can be obtained with reduced occurrence of pollution of members, even when a toner container is filled with a larger amount of toner than a conventional amount for long-term use. A toner including a toner particle and an external additive containing an organic-inorganic composite fine particle and an inorganic fine particle A; wherein the organic-inorganic composite fine particle includes a resin particle and an inorganic fine particle B, the resin particle has a surface with a convex derived from the inorganic fine particle B; has a specific number average particle diameter (D1) and a specific shape factor SF-2; and has a specific fixed state to the toner particle; the organic-inorganic composite fine particle has a specific unit diffusion index on the toner particle surface; the inorganic fine particle A has a specific BET specific surface area.

主权项

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 m2/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).