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US 9,005,865 B2Granted
Toner
AssigneeCanon Kabushiki Kaisha
InventorsNaotaka Ikeda, Emi Watanabe, Yuhei Terui, Taiji Katsura
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Abstract
A toner containing toner particles, each of which contains a binder resin and a colorant, and silica particles, wherein the silica particles have a volume average particle diameter (Dv) of 70 nm or more and 500 nm or less, the variation coefficient of diameters of the silica particles, based on volume distribution thereof, is 23% or less, and wherein when the silica particles are heated from 105° C. to 200° C., the ratio of mass decrease is 0.60% or less.
Claims3
A process for producing a toner, comprising the following steps of:
- (i) obtaining silica particles which are hydrophilic by sol-gel method,
- (ii) performing heat treatment of the silica particles which are hydrophilic, obtained by the step (i), at 300° C. to 500° C.,
- (iii) performing hydrophobizing treatment of the silica particles obtained by the step (ii), with a hydrophobizing agent, and
- (iv) adding the silica particles obtained by the step (iii), to toner particles.
1 more element
Dependencies are inferred from the claim text.