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US 2003/0165758 A1Published application
Developing agent, method for manufacturing the same, and image forming apparatus
AssigneeToshiba Tec Kabushiki Kaisha
InventorTakashi Urabe
Life of this patent
Estimating the term…
Abstract
A multi-layered toner comprises a core containing a first binder resin, and a covering layer containing a second binder resin having an acid value differing from that of the first binder resin. A magnetic powder is contained in at least one of the core and the covering layer.
Claims25
A developing agent including a multi-layered magnetic toner particle, said multilayered magnetic toner particle comprising:
- a toner core containing a first binder resin having a first acid value,
- a resin covering layer formed on said toner core and containing a second binder resin having a second acid value differing from said first acid value, and
- a magnetic powder contained in at least one of said toner core and said resin covering layer.
A method of manufacturing a developing agent, comprising:
- forming a resin covering layer on the surface of a toner core containing a first binder resin having a first acid value, said resin covering layer containing a second binder resin having a second acid value differing from said first acid value to obtain multi-layered magnetic toner particles;
- and
- adding a magnetic powder in at least one of the first binder resin and the second binder resin.
An image forming apparatus, comprising:
- an image carrier;
- a developing mechanism including a developing device arranged to face said image carrier and serving to develop an electrostatic latent image formed on the surface of said image carrier to form a developing agent image;
- a transfer mechanism for transferring said developing agent image onto a transfer material;
- and
- a fixing device for fixing the developing agent image transferred to said transfer material;
- wherein said developing agent is housed in said developing device, includes multi-layered magnetic toner particles, said multi-layered toner particles comprising a toner core containing a first binder resin having a first acid value, a resin covering layer formed on said toner core and containing a second binder resin having a second acid value differing from said first acid value, and a magnetic powder contained in at least one of said toner core and said resin covering layer.
3 more elements
Dependencies are inferred from the claim text.