Abstract: The composite particles contained in an inkjet ink are particles of a composite of a polyester resin having a sulfur atom-containing polar group and a dye. The polyester resin is non-crystalline. The polyester resin has a first repeating unit derived from a polyvalent carboxylic acid having the sulfur atom-containing polar group, a second repeating unit derived from a polyvalent carboxylic acid having no sulfur atom-containing polar group, and a third repeating unit derived from a polyhydric alcohol. The content percentage of the first repeating unit relative to a total amount of the first repeating unit and the second repeating unit is 1 to 10 mol %. The content percentage of the polyester resin relative to the composite particles is 50% by mass or more and less than 100% by mass.

Abstract: A composite core of a toner particle is a composite of a toner core containing a polyester resin and a plurality of resin particles each containing a first resin. A shell layer partially covering a surface of the composite core is a film containing a second resin. The first resin has a glass transition point that is 10° C. or more higher than a glass transition point of the second resin. The plurality of resin particles each have a particle diameter that is 1.5 times or more greater than a thickness of the shell layer. An amount of the resin particles is at least 0.3 parts by mass and no greater than 2.0 parts by mass relative to 100 parts by mass of the toner cores. The resin particles have a positive zeta potential at pH 4.

Abstract: An electrostatic latent image developing toner includes toner particles each including a toner core (11) and a shell layer (12) disposed over a surface of the toner core (11). The toner core (11) contains a polyester resin. The shell layer (12) includes: first resin particles (12a) having a number average primary particle diameter of at least 30 nm and less than 70 nm and a glass transition point of less than 80° C.; and second resin particles (12b) having a number average primary particle diameter of 70-200 nm and a glass transition point of at least 80° C. A percentage of an area of the toner core (11) covered with the first resin particles (12a) relative to a surface area of the toner core (11) is 40-80%. A ratio of total mass of the second resin particles (12b) to total mass of the first resin particles (12a) is 0.5-2.0.

Abstract: An electrostatic latent image developing toner includes toner particles each including a toner core (11) and a shell layer (12) disposed over a surface of the toner core (11). The toner core (11) contains a polyester resin. The shell layer (12) includes: first resin particles (12a) having a number average primary particle diameter of at least 30 nm and less than 70 nm and a glass transition point of less than 80° C.; and second resin particles (12b) having a number average primary particle diameter of 70-200 nm and a glass transition point of at least 80° C. A percentage of an area of the toner core (11) covered with the first resin particles (12a) relative to a surface area of the toner core (11) is 40-80%. A ratio of total mass of the second resin particles (12b) to total mass of the first resin particles (12a) is 0.5-2.0.

Abstract: A positively chargeable toner includes a plurality of toner particles each including a core and a shell layer disposed over a surface of the core. The core contains a polyester resin. The shell layer covers at least 40% and no greater than 80% of an area of the surface of the core, ?(4) is greater than 0 V. ?(6) is less than 0 V. A relationship represented by |?(3)??(4)|>|?(6)??(7)| is satisfied. ?(3), ?(4), ?(6), and ?(7) represent zeta potentials of the positively chargeable toner with the toner particles having no external additive. ?(3), ?(4), ?(6), and ?(7) are respectively measured in an aqueous medium at pH 3, pH 4, pH 6, and pH 7.

Abstract: A positively chargeable toner includes a plurality of toner particles each including a core and a shell layer disposed over a surface of the core. The core contains a polyester resin. The shell layer covers at least 40% and no greater than 80% of an area of the surface of the core, ?(4) is greater than 0 V. ?(6) is less than 0 V. A relationship represented by |?(3)??(4)|>|?(6)??(7)| is satisfied. ?(3), ?(4), ?(6), and ?(7) represent zeta potentials of the positively chargeable toner with the toner particles having no external additive. ?(3), ?(4), ?(6), and ?(7) are respectively measured in an aqueous medium at pH 3, pH 4, pH 6, and pH 7.

Abstract: A composite core of a toner particle is a composite of a toner core containing a polyester resin and a plurality of resin particles each containing a first resin. A shell layer partially covering a surface of the composite core is a film containing a second resin. The first resin has a glass transition point that is 10° C. or more higher than a glass transition point of the second resin. The plurality of resin particles each have a particle diameter that is 1.5 times or more greater than a thickness of the shell layer. An amount of the resin particles is at least 0.3 parts by mass and no greater than 2.0 parts by mass relative to 100 parts by mass of the toner cores. The resin particles have a positive zeta potential at pH 4.

Abstract: An electrostatic latent image developing toner includes toner particles that each include a toner mother particle. The toner mother particle includes a toner core, a shell layer disposed over a surface of the toner core, and inorganic particles. The inorganic particles are located at an interface between the toner core and the shell layer, or within the shell layer. The shell layer contains a thermosetting component. The toner mother particle has a BET specific surface area of at least 0.95 m2/g.

Abstract: A method of manufacturing resin particles uses a microreactor to mix first and second stock solutions, and to aggregate resin fine-particles to obtain resin particles. The microreactor includes stationary and rotating discs that are two discoid discs and that are disposed so that a gap is formed between circular surfaces of the two discs when the resin particles are manufactured, a first stock solution feed part that feeds the first stock solution from an end of the gap into the gap, and one or more second stock solution feed parts that are formed at the opposite side of the first stock solution feed part based on the center of the circular surface of the stationary disc by spatially connecting top and bottom surfaces of the stationary disc, and that feed the second stock solution containing an aggregating agent from the top surface side of the stationary disc to the gap.

Abstract: An electrostatic latent image developing toner includes toner particles that each include a toner mother particle. The toner mother particle includes a toner core, a shell layer disposed over a surface of the toner core, and inorganic particles. The inorganic particles are located at an interface between the toner core and the shell layer, or within the shell layer. The shell layer contains a thermosetting component. The toner mother particle has a BET specific surface area of at least 0.95 m2/g.

Abstract: An electrostatic latent image developing toner is manufactured by mixing an aqueous medium dispersion liquid (X) containing negatively chargeable toner cores and an aqueous medium dispersion liquid (Y) containing positively chargeable resin particulates, followed by stirring the mixture liquid to form shell layers each on a surface of the toner cores with the resin particulates. The shell layers are formed with the resin particulates subjected to a stirring treatment together with an anionic surfactant.

Abstract: An electrostatic latent image developing toner is manufactured by mixing an aqueous medium dispersion liquid (X) containing negatively chargeable toner cores and an aqueous medium dispersion liquid (Y) containing positively chargeable resin particulates, followed by stirring the mixture liquid to form shell layers each on a surface of the toner cores with the resin particulates. The shell layers are formed with the resin particulates subjected to a stirring treatment together with an anionic surfactant.

Abstract: A method of manufacturing resin particles uses a microreactor to mix first and second stock solutions, and to aggregate resin fine-particles to obtain resin particles. The microreactor includes stationary and rotating discs that are two discoid discs and that are disposed so that a gap is formed between circular surfaces of the two discs when the resin particles are manufactured, a first stock solution feed part that feeds the first stock solution from an end of the gap into the gap, and one or more second stock solution feed parts that are formed at the opposite side of the first stock solution feed part based on the center of the circular surface of the stationary disc by spatially connecting top and bottom surfaces of the stationary disc, and that feed the second stock solution containing an aggregating agent from the top surface side of the stationary disc to the gap.

Abstract: A developing device includes: a developer carrying body which supplies developer to a predetermined image carrying body; a layer thickness regulating member which is made of a magnetic material, which has a layer thickness regulating face opposing the developer carrying body so as to form a predetermined gap between the layer thickness regulating face and the developer carrying body and regulating the layer thickness of the developer on the developer carrying body, and which forms a magnetic path between the layer thickness regulating face and the developer carrying body; an installation member on which the layer thickness regulating member is installed; and an elastic sheet member arranged in the gap in a state of contact with a surface of the developer carrying body.

Abstract: The development device includes a developer storage part storing a developer, a developer carrier having a carrying surface for carrying the developer and a first magnet, and receiving the developer from the developer storage part on the carrying surface while rotating in a predetermined direction, and supplying the developer to a predetermined image carrier, a magnetic member formed from a magnetic material, forming a predetermined regulatory gap with the carrying surface, and arranged opposite to the first magnet, a second magnet disposed more upstream than the magnetic member when viewed from the rotating direction of the developer carrier, and having a magnetic pole of the same polarity as the first magnet, and a deterioration suppressing part suppressing deterioration of the developer transported to the regulatory gap along with the rotation of the developer carrier.

Abstract: A developing device includes a developer storing portion, a developer carrying body, a first regulating member having a first regulating surface regulating a layer thickness of the developer on the developer carrying body, a second regulating member having a second regulating surface that is set so as to gradually become apart from the developer carrying body toward the upstream side with respect to the rotation direction of the developer carrying body to regulate an amount of the developer conveyed to the first regulating surface, the second regulating surface being arranged with a step formed between the second regulating surface and the first regulating surface, and a sheet member so attached to the second regulating surface as to cover at least a portion of the step between the first regulating surface and the second regulating surface.

Abstract: A developing device includes a container storing a two-component developer including a toner and a carrier, a toner carrying body carrying the toner in the container and supplying the toner to a predetermined image carrying body by rotation, a restricting member held in press contact with the toner carrying body, and a restricting nip section formed between the toner carrying body and the restricting member. The restricting nip section selects only the toner in the two-component developer to form a uniform toner layer on the toner carrying body.

Abstract: The development device includes a developer storage part storing a developer, a developer carrier having a carrying surface for carrying the developer and a first magnet, and receiving the developer from the developer storage part on the carrying surface while rotating in a predetermined direction, and supplying the developer to a predetermined image carrier, a magnetic member formed from a magnetic material, forming a predetermined regulatory gap with the carrying surface, and arranged opposite to the first magnet, a second magnet disposed more upstream than the magnetic member when viewed from the rotating direction of the developer carrier, and having a magnetic pole of the same polarity as the first magnet, and a deterioration suppressing part suppressing deterioration of the developer transported to the regulatory gap along with the rotation of the developer carrier.

Abstract: A developing device includes a developer storing portion, a developer carrying body, a first regulating member having a first regulating surface regulating a layer thickness of the developer on the developer carrying body, a second regulating member having a second regulating surface that is set so as to gradually become apart from the developer carrying body toward the upstream side with respect to the rotation direction of the developer carrying body to regulate an amount of the developer conveyed to the first regulating surface, the second regulating surface being arranged with a step formed between the second regulating surface and the first regulating surface, and a sheet member so attached to the second regulating surface as to cover at least a portion of the step between the first regulating surface and the second regulating surface.

Abstract: A developing device includes: a developer carrying body which supplies developer to a predetermined image carrying body; a layer thickness regulating member which is made of a magnetic material, which has a layer thickness regulating face opposing the developer carrying body so as to form a predetermined gap between the layer thickness regulating face and the developer carrying body and regulating the layer thickness of the developer on the developer carrying body, and which forms a magnetic path between the layer thickness regulating face and the developer carrying body; an installation member on which the layer thickness regulating member is installed; and an elastic sheet member arranged in the gap in a state of contact with a surface of the developer carrying body.