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AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsTakashi Urabe, Takayasu Aoki, Tsuyoshi Itou, Yasuhito Noda, Motonari Udo, Satoshi Araki, Masahiro Ikuta, Takafumi Hara, Asumi Matsumoto
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The dispersion liquid including toner material particles is introduced into a mechanical shearing device including a heating unit, a mechanical shearing unit, and a cooling unit, heated to a temperature not lower than the glass transition temperature of the polyester resin under a condition that satisfies the following relationship (1), subjected to mechanical shearing, and thereafter cooled, whereby fine particles are obtained. −2<log((A+B)/C)<2 (1) With the proviso that a volume of a portion in which the dispersion liquid flows in the heating unit and the mechanical shearing unit is expressed as A cc, a volume of a portion in which the dispersion liquid flows in the cooling unit is expressed as B cc, and a flow rate of the dispersion liquid is expressed as C cc/min.
A method for producing a developing agent comprising:
A developing agent comprising fine particles obtained by dispersing a granulated mixture containing a binder resin and a colorant in an aqueous medium, introducing the resulting dispersion liquid into a mechanical shearing device including a heating unit, a mechanical shearing unit, and a cooling unit, heating the dispersion liquid to a temperature not lower than the glass transition temperature of the polyester resin, subjecting the dispersion liquid to mechanical shearing, and cooling the dispersion liquid, wherein
Dependencies are inferred from the claim text.