Method for producing developing agent
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsMasahiro Ikuta, Takayasu Aoki, Takashi Urabe, Tsuyoshi Itou, Yasuhito Noda, Motonari Udo, Satoshi Araki, Takafumi Hara, Asumi Matsumoto
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Abstract
After fine particles containing a binder resin and a coloring agent are agglomerated in a dispersion liquid to form agglomerated particles, an inverting agent which inverts a sign of a zeta potential of the agglomerated particles is added to the dispersion liquid to stabilize the agglomerated particles, and then, the agglomerated particles are fused.
Claims7
A method for producing a developing agent comprising:
- adding an agglomerating agent to a dispersion liquid of fine particles containing a binder resin and a coloring agent and having a first particle size to agglomerate the fine particles to form agglomerated particles having a second particle size larger than the first particle size;
- forming fused particles by adding an inverting agent which inverts a sign of a zeta potential of the agglomerated particles to the dispersion liquid to stabilize the agglomerated particles, and then, heating the dispersion liquid to fuse the agglomerated particles;
- and
- obtaining toner particles by washing and separating the fused particles.
A developing agent comprising toner particles obtained by agglomerating fine particles containing a binder resin and a coloring agent and having a first particle size in a dispersion liquid, adding an inverting agent which inverts a sign of a zeta potential of the agglomerated particles having a second particle size larger than the first particle size to the dispersion liquid containing the agglomerated particles to stabilize the agglomerated particles, followed by fusing the agglomerated particles.
Dependencies are inferred from the claim text.