Toner for developing electrostatic image, two-component developer and image forming apparatus

摘要

A toner for developing an electrostatic image, including: toner base particles each including a binder resin and a releasing agent; and inorganic fine particles, wherein the toner includes the inorganic fine particles as an external additive on a surface of the toner base particle, wherein the toner base particles have a BET specific surface area of 2.5 m2/g to 5.0 m2/g, and wherein the inorganic fine particles comprise inorganic fine particles (A) which are each a secondary particle where a plurality of primary particles are coalesced together.

主权项

1. A toner for developing an electrostatic image, comprising:
toner base particles each comprising a binder resin and a releasing agent; and inorganic fine particles, wherein the toner comprises the inorganic fine particles as an external additive on a surface of the toner base particle, wherein the toner base particles have a BET specific surface area of 2.5 m2/g to 5.0 m2/g, and wherein the inorganic fine particles comprise inorganic fine silica particles (A) which are each a secondary particle where a plurality of primary particles are coalesced together by chemically bonding, wherein the inorganic fine silica particles (A) have Db50/Db10 of 1.20 or less, where Db50 is a particle diameter at which a cumulative percentage of a secondary particle diameter Db of the inorganic fine silica particles (A) measured from a side of smaller particles is 50% by number, and Db10 is a particle diameter at which the cumulative percentage measured from the side of smaller particles is 10% by number.