ELECTROSTATIC LATENT IMAGE DEVELOPING TONER

摘要

A shell layer of a toner particle includes first resin particles containing no charge control agent and second resin particles containing a charge control agent. A number average particle diameter of the first resin particles is at least 30 nm and no greater than 60 nm, and a number average particle diameter of the second resin particles is at least 30 nm and no greater than 60 nm. A shell coverage is at least 60% and no greater than 80%. A shell chargeable ratio is at least 0.10 and no greater than 0.20. A roughness of surface regions of toner particles in which no external additive is present is at least 10 nm and no greater than 15 nm.

主权项

1. An electrostatic latent image developing toner comprising a plurality of toner particles each including a core and a shell layer disposed over a surface of the core, wherein
the shell layer includes first resin particles containing no charge control agent and second resin particles containing a charge control agent, a number average particle diameter of the first resin particles is at least 30 nm and no greater than 60 nm and a number average particle diameter of the second resin particles is at least 30 nm and no greater than 60 nm, a rate of an area of a surface region of the core covered with at least one of the first resin particles and the second resin particles relative to an area of an entire surface region of the core is at least 60% and no greater than 80%, a ratio of an area of a surface region of the core covered with the second resin particles relative to the area of the surface region of the core covered with at least one of the first resin particles and the second resin particles is at least 0.10 and no greater than 0.20, and a roughness of surface regions of the toner particles in which no external additive is present is at least 10 nm and no greater than 15 nm.