Developing agent and method for manufacturing the same
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsTakashi Urabe, Tsuyoshi Ito, Motonari Udo, Masahiro Ikuta
Life of this patent
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Abstract
A method for manufacturing a developing agent by mixing a coarsely granulated mixture containing a binder resin and a coloring agent with an aqueous medium and mechanically stirring the resulting mixed solution to finely granulate the coarsely granulated mixture, thereby forming a fine particle.
Claims16
A method for manufacturing a developing agent, comprising:
- melt kneading and pulverizing a mixture containing at least a binder resin and a coloring agent to form a granulated mixture having a first volume average particle size;
- mixing the granulated mixture with an aqueous medium to form a mixed solution;
- mechanically stirring the mixed solution to finely granulate said granulated mixture to form a fine particle having a second volume average particle size small than the first volume average size;
- and
- coagulating the fine particle to form a coagulated particle having a third volume average particle size smaller than the first volume average size and larger than the second volume average particle size.
A developing agent containing a coagulated particle of fine particles which are obtained by melt kneading and pulverizing a mixture containing a binder resin and a coloring agent, mixing the resulting granulated mixture with an aqueous medium and mechanically stirring the mixture,
- wherein the granulated mixture has a first volume average particle size, and the fine particle has a second volume average particle size smaller than the first volume average particle size, and the coagulated particle has a third volume average particle size smaller than the first volume average particle size and larger than the second volume average particle size.
Dependencies are inferred from the claim text.