Abstract: Provided is a two-component developer with which degradation of development is inhibited even in the case of prolonged use, and thereby a high quality image exhibiting high resolution and sufficient image density can be formed for a long duration. Also disclosed is a two-component developer possessing a carrier and a toner, wherein the carrier in which magnetic material powder is dispersed in a binder resin containing a phenol formaldehyde resin has a shape coefficient SF-1 of 1.0-1.2, a shape coefficient SF-2 of 1.1-2.5 and a volume-based median particle diameter of 10-100 ?m, and the toner possesses a colored particle and an external additive particle, wherein the external additive particle comprises a titanic acid compound and iron, and the iron content is 100-1,000 ppm, based on the titanic acid compound.

Abstract: An electrophotographic image forming method is disclosed. In the method electrostatic latent image is developed by a non-magnetic single-component developing system, in which a non-magnetic single-component developer is conveyed by a developer carrying member, the developer carrying member is contacted with a developer layer regulation member for regulating an amount of the developer at the surface of the developer carrying member, and a binder resin of the developer comprises a vinyl polymer having an acid value of from about 5 to about 30 mgKOH/g and a ratio of hydroxyl group value/acid values from about 0.3 to about 0.8.

Abstract: Provided are a toner and a toner manufacturing method with which high image density and a broad range of color reproduction are obtained, and with which high-quality images are also obtained. The toner is composed of toner particles that comprise a binding resin containing a polyester resin and a colorant, and contains 10-1,500 ppm of a metal element selected from titanium, germanium, and aluminum, and a cyclic phenol sulfide represented by general formula (1) selected from thiacalixarene, sulfinyl thiacalixarene and sulfonyl thiacalixarene.

Abstract: An electrostatic image developing toner is disclosed, comprising a resin and a colorant, wherein the toner contains at least one iminocarboxylic acid or its salt in an amount of from 26 to 388 ppm by mass.

Abstract: Provided is a method of manufacturing an electrostatic charge image developing toner exhibiting reduced variation in charging amount among manufacturing lots, which is capable of generating no fog, and acquiring high density print images. Disclosed is a method of manufacturing an electrostatic charge image developing toner, possessing the step of washing toner mother particles having been formed in an aqueous medium with washing water, wherein the washing water has a total dissolution component amount of at least 0.05 mg/liter and less than 0.5 mg/liter.

Abstract: Disclosed is an image forming method comprising developing a latent electrostatic image formed on the surface of a latent electrostatic image bearing body by a developer borne and conveyed by a developer bearing body which is brought into contact with a developer layer control member to control an amount of the developer on the surface of the developer bearing body through a nonmagnetic single-component development system, wherein an acid value (SAV) of the surface of the developer and a total acid value (TAV) of the developer meet the following requirements: 1<SAV/TAV?5 and 5?TAV?25, and a ratio of a mass average particle size (d50, ?m) of the developer to a surface roughness (Ra, ?m), d50/Ra being in a range of 0.5 to 3.0 and an average spacing (Sm) between protruding peaks of the developer bearing body being in a range of 20 to 200 ?m.

Abstract: A toner comprising: (i) toner particles, each toner particle comprising a binder resin and a colorant; and (ii) an oxymonocarboxylic acid or a salt thereof, wherein a total content of the oxymonocarboxylic acid or the salt thereof in the toner is 10 to 173 ppm based on the total weight of the toner.

Abstract: It is to provide a toner which can form an image of high image quality exhibiting high resolution wherein a final visible image exhibits high image density and high thin-line reproducibility even in long-term use. In a toner incorporating at least a colored particle containing a binder resin composed of a polyester resin and a colorant, and external additive particles, the toner has a degree of average circularity of 0.950-0.990, a volume based median diameter of 4.5-8.0 ?m, a volume based particle diameter dispersibility (CVVOL value) of 15-25; a metal selected from titanium, germanium, and aluminum is incorporated at a ratio of 10-1500 ppm; the above external additive particles is composed of a composite oxide incorporating a silicon atom and at least either of a titanium atom and an aluminum atom; and the existence ratio of silicon atoms in the surface thereof is higher than the existence ratio of silicon atoms in the entire part thereof.

Abstract: A two component developer comprising a toner and a carrier, wherein the toner includes: colored particles; and external additive particles comprising a complex oxide incorporating silicon atoms and at least one of titanium atoms and aluminum atoms, and a surface existing ratio of the silicon atoms (R2) in a surface of the external additive particles being larger than an average existing ratio of the silicon atoms (R1) in an entirety of the external additive particles, and carrier particles comprise magnetic material powder dispersed in a phenol-formaldehyde resin, and have an average of the shape coefficient SF-1 of 1.0 to 12 and an average of the shape coefficient SF-2 of 1.1 to 2.5, and a volume based median diameter of from 10 to 100 ?m.

Abstract: Provided is a two-component developer with which degradation of development is inhibited even in the case of prolonged use, and thereby a high quality image exhibiting high resolution and sufficient image density can be formed for a long duration. Also disclosed is a two-component developer possessing a carrier and a toner, wherein the carrier in which magnetic material powder is dispersed in a binder resin containing a phenol formaldehyde resin has a shape coefficient SF-1 of 1.0-1.2, a shape coefficient SF-2 of 1.1-2.5 and a volume-based median particle diameter of 10-100 ?m, and the toner possesses a colored particle and an external additive particle, wherein the external additive particle comprises a titanic acid compound and iron, and the iron content is 100-1,000 ppm, based on the titanic acid compound.

Abstract: Provided is a method for forming an image containing the steps of: (a) forming an electrostatic latent image on an electrostatic latent image carrier; and (b) developing the electrostatic latent image by a two component developer comprising a toner and a carrier, wherein the two component developer is continually replenished in the developing step. (b); and the toner includes: colored particles.; and external additive particles comprising a complex oxide incorporating silicon atoms and at least one of titanium atoms and aluminum atoms, and a surface existing ratio of the silicon atoms (R2) in a surface of the external additive particles being larger than an average existing ratio of the silicon atoms (R1) in an entirety of the external additive particles.

Abstract: Provided is an electrostatic charge image developing toner usable for downsized color image forming apparatus capable of rapid print preparation with neither an influence on production cost nor use of a specific material as the toner constituent material. Also disclosed is an electrostatic charge image developing toner possessing at least a resin and a colorant, wherein the electrostatic charge image developing toner contains 12-984 ppm of a polyvalent organic acid or a salt thereof.

Abstract: A toner is disclosed. The toner comprises a vinyl resin, a colorant, and a compound represented by a formula of Compound 1, Compound 2 ion or Compound 3.

Abstract: An electrophotographic image forming method is disclosed. In the method electrostatic latent image is developed by a non-magnetic single-component developing system, in which a non-magnetic single-component developer is conveyed by a developer carrying member, the developer carrying member is contacted with a developer layer regulation member for regulating an amount of the developer at the surface of the developer carrying member, and a binder resin of the developer comprises a vinyl polymer having an acid value of from about 5 to about 30 and a ratio of hydroxyl group value/acid values from about 0.3 to about 0.8.

Abstract: Disclosed is an image forming method comprising developing a latent electrostatic image formed on the surface of a latent electrostatic image bearing body by a developer borne and conveyed by a developer bearing body which is brought into contact with a developer layer control member to control an amount of the developer on the surface of the developer bearing body through a nonmagnetic single-component development system, wherein an acid value (SAV) of the surface of the developer and a total acid value (TAV) of the developer meet the following requirements: 1<SAV/TAV?5 and 5?TAV?25, and a ratio of a mass average particle size (d50, ?m) of the developer to a surface roughness (Ra, ?m), d50/Ra being in a range of 0.5 to 3.0 and an average spacing (Sm) between protruding peaks of the developer bearing body being in a range of 20 to 200 ?m.

Abstract: A toner comprising: (i) toner particles, each toner particle comprising a binder resin and a colorant; and (ii) an oxymonocarboxylic acid or a salt thereof, wherein a total content of the oxymonocarboxylic acid or the salt thereof in the toner is 10 to 173 ppm based on the total weight of the toner.

Abstract: An electrostatic image developing toner is disclosed, comprising a resin and a colorant, wherein the toner contains at least one iminocarboxylic acid or its salt in an amount of from 26 to 388 ppm by mass.

Abstract: Provided is an electrostatic charge image developing toner usable for downsized color image forming apparatus capable of rapid print preparation with neither an influence on production cost nor use of a specific material as the toner constituent material. Also disclosed is an electrostatic charge image developing toner possessing at least a resin and a colorant, wherein the electrostatic charge image developing toner contains 12-984 ppm of a polyvalent organic acid or a salt thereof.