Electrostatic latent image developing toner and production method thereof
AssigneeKonica Corporation
InventorsAsao Matsushima, Ken Ohmura, Takao Yamanouchi, Naohiro Hirose, Tomoe Kitani, Yoshiki Nishimori
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Abstract
A toner for forming an electrophotographic image is disclosed. The toner particle contains at least two inorganic salts including an inorganic salt comprising a positive ion having a first valence and an inorganic salt comprising a positive ion having a second valence different from the first valence, a total amount of the inorganic salt having the first valence is greatest among the inorganic salts in the toner particle, and a total amount of the inorganic salt having the second valence is second greatest among the inorganic salts in the toner particle.
Claims23
A toner for forming an electrophotographic image comprising a toner particle comprising a resin and a colorant, wherein the toner particle comprises at least two inorganic salts including an inorganic salt comprising a positive ion having a first valence and an inorganic salt comprising a positive ion having a second valence different from the first valence, a total amount of the inorganic salt having the first valence is greatest among the inorganic salts in the toner particle, and a total amount of the inorganic salt having the second valence is second greatest among the inorganic salts in the toner particle, with the formulas of;
- 2.0≧a≧0.11.0≧b≧0.017.5≧a/b≧1.1
- wherein “a” is percent by weight of the first inorganic salt based on the total weight of the toner and “b” percent by weight of the second inorganic salt based on the total weight of the toner, and “a” and “b” is value in terms of anhydride.
A production method of toner for forming an electrophotographic image, in which the toner particle is formed through salting-out/aggregating resinous particles in a dispersion comprising resinous particles, wherein the production method comprises
- (1) adding a salting-out agent which initiates growth of aggregated particle to the dispersion,
- (2) adding a salting-out termination agent to the dispersion when aggregated particles has predetermined size,
- (3) separating aggregated particles from said dispersion, and
- (4) drying the aggregated particles, in the order.
Dependencies are inferred from the claim text.