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US 8,012,661 B2Granted
Method for producing developing agent
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsMotonari Udo, Takayasu Aoki, Takashi Urabe, Tsuyoshi Itou, Yasuhito Noda, Satoshi Araki, Masahiro Ikuta, Takafumi Hara
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Abstract
A method for producing a developing agent contains mechanically shearing a mixture containing a polyester resin, a colorant and a releasing agent to form first fine particles, aggregating the first fine particles to form aggregated particles as a core, aggregating second fine particles containing a polyester resin onto the core to form a shell.
Claims7
A method for producing a developing agent comprising:
- melt-kneading a mixture containing a polyester resin, a colorant and a releasing agent to form a kneaded product, coarsely pulverizing the kneaded product to form a coarsely granulated mixture;
- mixing the coarsely granulated mixture with an aqueous medium to form a mixed liquid, mechanically shearing the mixed liquid to granulate finely the coarsely granulated mixture, thereby forming a first fine particle dispersion liquid;
- aggregating first fine particles in the first fine particle dispersion liquid to form aggregated particles;
- mixing coarse particles containing at least a polyester resin with an aqueous medium to form a mixed liquid, mechanically shearing the mixed liquid to granulate finely the coarse particles, thereby forming a second fine particle dispersion liquid;
- and
- mixing the second fine particle dispersion liquid with the aggregated particles to aggregate second fine particles in the second fine particle dispersion liquid onto a surface of the aggregated particles, thereby forming capsulated toner particles containing the aggregated particles as a core and the second fine particles as a shell.
3 more elements
Dependencies are inferred from the claim text.