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US 2012/0237867 A1Published application
Toner, developer, and method of manufacturing toner
AssigneeRicoh Company, Ltd.
InventorMasayuki Ishii
Life of this patent
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Abstract
A toner is provided including a mother particle and an external additive covering the surface of the mother particle. The mother particle includes a binder resin and a release agent. The external additive includes a hydroxyapatite silica complex porous particle having a number average particle diameter of 160 nm or less.
Claims14
A toner, comprising:
- a mother particle, the mother particle including a binder resin and a release agent;
- and
- an external additive covering a surface of the mother particle, the external additive including a hydroxyapatite silica complex porous particle having a number average particle diameter of 160 nm or less.
A method of producing toner, comprising:
- dissolving or dispersing toner components in an organic solvent to prepare a toner components liquid, the toner components including a binder resin or a precursor thereof and a release agent;
- dispersing the toner components liquid in an aqueous medium to prepare an emulsion;
- removing the organic solvent from the emulsion to prepare a mother particle;
- and
- covering a surface of the mother particle with an external additive, the external additive including a hydroxyapatite silica complex porous particle having a number average particle diameter of 160 nm or less.
2 more elements
Dependencies are inferred from the claim text.