Abstract: A method for producing a developing agent, wherein in the formation of aggregated particles, particles in a dispersion liquid have a volume average particle diameter of 2 ?m or less when the pH of the dispersion liquid is 7, and also the pH of the dispersion liquid is from 3.0 to 6.9 when the zeta potential of the particles is ?30 mV.

Abstract: In a manufacturing method of a resin for developing agent, a first polymerization agent is added in an aqueous medium; a radical polymerizable monomer is polymerized in the presence of a chain transfer agent to form a low molecular substance resin particle; after consuming the chain transfer agent, a second polymerization initiator is added in the aqueous medium; and the remaining monomer is polymerized to form a high molecular substance resin particle, thereby improving fixability of the developing agent.

Abstract: The method for producing a developing agent according to the invention contains subjecting the toner material dispersion liquid to mechanical shearing to make the granular mixture into fine particles, thereby providing a dispersion liquid containing fine particles having a smaller particle diameter than a particle diameter of the granular mixture. The toner material dispersion liquid is subjected to mechanical shearing under a temperature of a glass transition point Tg of the binder resin or more and a pressure of 10 MPa or more, and the resulting dispersion liquid containing the fine particles is depressurized with two or more stages while maintaining the temperature of a glass transition point Tg of the binder resin or more and then cooled to a temperature of a glass transition point Tg of the binder resin or less.

Abstract: In a method for producing a developing agent by coagulating a toner fine particle dispersion including a toner fine particle, an aqueous medium and a dispersant to obtain a toner particle, the coagulation is carried out only by pH adjustment, the dispersant is a surfactant, and a concentration of the surfactant is a concentration of not more than a critical micell concentration of the toner material dispersion.

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.

Abstract: A surfactant is added in an amount of from 0.1 to 5% by weight of the total weight of a developing agent at the time of at least either kneading a toner material or subjecting the toner material to mechanical shearing.

Abstract: 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.

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.

Abstract: It is intended to provide a method includes the step of forming agglomerated particles by agglomerating fine particulate mixture containing a binder resin and a colorant. In the step of forming agglomerated particles, a cationic organic coagulating agent having an average molecular weight of from 1000 to 100000 is added to a liquid dispersion containing fine particles.

Abstract: A method for manufacturing a developing agent includes forming a toner particle by adding an aggregating agent to a dispersion containing fine particles containing a binder resin and a colorant to allow aggregation and melt adhesion to occur, wherein the pH of the dispersion satisfies the formula (1) below, when denoting pH before the addition of the aggregating agent by pH(A), the pH of the dispersion after the addition of the aggregating agent by pH(B), and the pH of the dispersion after the melt adhesion by pH(C): 0.90?pH(C)/pH(A)?0.25 and 1.00?pH(C)/pH(B)?0.30??(1).

Abstract: A coarse particle containing a polyester based resin and a coloring agent is added in an aqueous medium containing a surfactant, a basic substance and an inorganic water-soluble electrolyte, and dispersion and coagulation are carried out to form a toner particle.

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.

Abstract: A developing agent including a core containing an amorphous polyester resin and a fatty acid ester based wax, a shell provided on the surface of the core and containing a copolymer of an aromatic vinyl monomer and acrylic acid or an acrylic ester, and a coloring agent.

Abstract: A method for producing a developing agent, includes preparing a dispersion of particles containing a binder resin and a coloring agent and forming toner particles by aggregating and fusing the particles, in which the number of coarse particles having a particle size of 0.6 ?m or larger after the solid concentration of the dispersion of particles is adjusted to 1 ppm is less than 3,000 per ?L.

Abstract: A method for manufacturing a developing agent by mixing a resin having a dissociable functional group and an aqueous medium, subjecting the mixture to mechanical shearing, finely pulverizing the pulverized mixture to form resin microparticles, adding a dispersion of colorant particles, causing the resin microparticles and colorant particles to agglomerate, and forming toner particles.

Abstract: A mixture containing a binder resin and a colorant is mixed with an aqueous medium, the resulting mixture liquid is mechanically sheared to finely granulate the mixture, fine particles are formed as cores, and a coating resin layer is formed on core surfaces, to obtain toner particles.

Abstract: A dispersion containing a coloring agent particle is mixed in a dispersion of a radical polymerizable monomer, and a reducing agent containing an iron(II) salt is added in the presence of a polymerization initiator to polymerize the dispersed radical polymerizable monomer by the action of a generated radical, thereby not only forming a binder resin fine particle but coagulating the binder resin fine particle and the coloring agent particle to form a coagulated particle.

Abstract: A method including polymerization performed with the use of a binder resin dispersion containing a styrene monomer, a compound having one or more unsaturated bond and sulfonic acid or sulfonate, and an acrylic ester monomer, wherein the contents of the monomers and the compound are 60 to 90 mol %, 1 mol ppm to 10 mol %, and 10 to 40 mol %, respectively.

Abstract: A developing agent including a toner particle obtained by using a dispersion containing a solvent, a granular mixed compound having a binder resin and a coloring agent dispersed in the solvent, and, as an additive to disperse a compound, a combination of a surfactant and a basic compound or a combination of a sulfone-based surfactant and a polycarboxylic acid-based surfactant, wherein the additive remaining in the developing agent is within a predetermine range.

Abstract: In a manufacturing method of a developing agent, by mixing a coloring agent fine particle with at least a surfactant, an aqueous solvent and an organic solvent, thereby dispersing the coloring agent fine particle in a solvent containing the surfactant, the aqueous solvent and the organic solvent, it becomes possible to obtain favorable coloring agent dispersibility and to improve the OHP transparency in the resulting developing agent.