Abstract: A two component developer used in an electrophotographic method composed of a toner containing at least a resin and a colorant, and a carrier, is disclosed. The resin is composed of a polyester resin and a styrene-acryl resin, in which the polyester resin is prepared via condensation-polymerization of a polyvalent carboxylic acid and a polyol in a state where a styrene monomer and an acrylate monomer exist in an aqueous medium containing an acidic compound, followed by formation of the styrene-acryl resin via radical polymerization of the styrene monomer and the acrylate monomer; and the carrier comprises magnetic material powder dispersed in a binder resin, and has a volume based median diameter of 10 ?m-100 ?m, a shape factor SF-1 of 1.0-1.2, and a shape factor SF-2 of 1.1-2.5.

Abstract: Disclosed is a toner comprising toner particles comprising a binding resin and a colorant, wherein the toner particles exhibit an average circularity of 0.950 to 0.980, a volume-base median diameter of 4.5 to 8.0 ?m and a volume-based particle size dispersion degree (CVvol) of 15 to 25 and contain a metal element selected from the group consisting of titanium, germanium and aluminum in an amount of 10 to 1500 ppm. A manufacturing method of the toner is also disclosed.

Abstract: A toner comprising toner particles containing a colorant and a binder resin, the binder resin comprising a polyester resin, wherein the polyester resin comprises at least a polyester segment containing an aromatic dial component, the polyester segment being derived from an aromatic diol and a dicarboxylic acid, wherein a content of the polyester segment containing an aromatic dial component is higher in a surface-portion of the toner particle than in a central portion of the toner particle.

Abstract: Image forming method comprising a step of fixing a toner image in a fixing device of a contact heating system, wherein the toner comprises a resin which comprises a polyester resin and a styrene-aryl resin and is formed by a process comprising allowing a polyvalent carboxylic acid and a polyvalent alcohol to condensation-polymerize in the presence of a styrene monomer and an acrylic acid ester monomer in an aqueous medium to form the polyester resin and allowing the styrene monomer and the acrylic acid ester monomer to radical-polymerize to form the styrene-acryl resin; the fixing device of a contact heating system comprises a heating roller and a belt-form pressure means.

Abstract: Toners of the same color but with different characteristics are stored in the toner cartridges. For example, toners for high image quality (High Grade) with small particle diameter are stored in some toner cartridges and toners for low image quality (Low Grade) are stored in other toner cartridges. In this case, case, the mode of forming images using small particle diameter toner for high image quality using an image forming engine and the mode of forming images using a toner for low image quality using another image forming engine are executed by the image forming apparatus.

Abstract: A toner for an electrophotography comprising a resin and a colorant is disclosed. The toner is formed by a process including a step of aggregating resin particles, and the toner comprises a volatile ketone compound in an amount of 4-60 ppm and carnauba wax in toner particles.

Abstract: A toner for developing an electrostatic image is disclosed. The toner contains an amount of not less than 0.1% by weight of an element selected from elements of the Groups of 1B, 2B, 4B, 5B, 6B, 7B, 8, 3A and 4A of the fourth and fifth periodic of the long periodic table of the elements, and the isolation ratio of the element is not more than 10% by number.

Abstract: An objective is to provide toner by which high quality images can be stably formed for a long duration. Disclosed is a toner possessing toner particles each containing a binder resin and a colorant, wherein the toner particle has a low surface energy group chemically bonded to the binder resin on a surface of the toner particle. It is preferable that the low surface energy group is an aliphatic hydrocarbon group, and the binder resin is urea-modified polyester. Also disclosed is a method of manufacturing a toner containing toner particles each containing a binder resin and a colorant, comprising the step of chemically reacting a compound possessing a reactive substituent and the aliphatic hydrocarbon group on the toner particle surface to chemically combine the aliphatic hydrocarbon group with the binder resin via the reactive substituent on the toner particle surface.

Abstract: A method for producing a toner comprising the step of coagulating at least one crystalline ester compound represented by Formula 1 and resin particles in an aqueous medium in the presence of and aluminum compound. R1—(OCO—R2)nFormula 1 In the formula, R1 and R2 are each a carbon hydride group having from 1 to 40 carbon atoms which may have a substituent and n is an integer of from 1 to 4.

Abstract: An image forming method, comprising the steps of: agitating a mixture of toner particles and carrier particles so as to electrically charge the toner particles; forming a charged toner layer on a toner conveying roller by extracting the charged toner particles from the mixture; forming an electrostatic latent image on an image carrying member; and conveying the charged toner layer by the toner conveying roller so as to develop the electrostatic latent image on the image carrying member with charged toner; wherein the carrier particles are carrier particles each formed by dispersing magnetic fine powder in a binder resin and have a shape coefficient SF-1 of 1.0 to 1.2, a shape coefficient SF-2 of 1.1 to 2.5, and a volume-based median size of 10 to 100 ?m.

Abstract: A toner comprising a binder resin and a colorant, wherein the binder resin comprises an urea modified polyester, the urea modified polyester being prepared by urea-bonding an isocyanate-modified crystalline polyester segment and an isocyanate-modified amorphous polyester using an amine crosslinking agent.

Abstract: An image forming method of forming images on both sides of a recording sheet; comprising the steps of: fixing a first toner image on a first surface a recording sheet; and fixing a second toner image on a second surface of the recording sheet; wherein in two-component developer includes toner particles each containing a binder resin having a glass transition temperature Tg ° C. and a colorant and carrier particles in each on which magnetic powder is dispersed in a binder resin including a phenol formaldehyde obtained by a polymerization process, and the first toner image is fixed with first heat in such a way that the surface temperature of the first surface of the recording sheet is a temperature in a range of Tg ° C. or more and lower than 100° C.

Abstract: An electrophotographic developer comprising a toner and a carrier is disclosed. The toner contains a toner binder resin, a colorant and a releasing agent, and a carrier contains a magnetic particles dispersed in a carrier binder resin, wherein the releasing agent contained in toner is composed of from 40 to 98% by weight of a first releasing agent component of an ester compound and 60 to 2% by weight of a second releasing agent component of a hydrocarbon compound having a branched-chain structure, and the carrier has a shape coefficient SF-1 of from 1.0 to 1.2 and a shape coefficient S-2 of from 1.1 to 2.5, and a volume based median diameter of from 10 to 100 ?m.

Abstract: A color image forming method, comprising the steps of: forming a yellow toner image with a two component yellow developer, a light yellow toner image with a two component light yellow developer, a magenta toner image with a two component magenta developer, a light magenta toner image with a two component light magenta developer, a cyan toner image with a two component cyan developer, a light cyan toner image with a two component light cyan developer, and a black toner image with a two component black developer, and superimposing toner images. The carrier in the developer includes carrier particles in each of which a magnetic powder is dispersed in a binder resin and which have a shape coefficient SF-1 of 1.0 to 1.2, a shape coefficient SF-2 of 1.1 to 2.5 and a volume-based median size of 10 to 100 ?m.

Abstract: An electrophotographic developer comprising a toner and a carrier is disclosed. The contains a toner binder resin, a colorant and a releasing agent, and a carrier contains magnetic particles dispersed in a carrier binder resin, wherein the releasing agent contains a first releasing agent component of a linear-chain hydrocarbon compound having a melting point of from 50 to 100° C. in a ratio of from 10 to 95% by weight and a second releasing agent component comprising a branched-chain structure hydrocarbon compound having a melting point of from 50 to 100° C. in a ratio of from 5 to 90% by weight, and the carrier has a shape coefficient SF-1 of from 1.0 to 1.2, a shape-coefficient SF-2 of from 1.1 to 2.5 and a volume based median diameter of from 10 to 100 ?m.

Abstract: An image forming method wherein a storage container, accommodating the toner having a volume-based median diameter of 3.5 ?m through 8.5 ?m and containing a resin having a glass-transition temperature of 0° C. through 46° C. and a softening point of 75° C. through 110° C., is included in an packaging container made of a substance having an apparent density of 0.1 through 0.3; and a toner supply section constituting the storage container is exposed to the outside from the packaging container, and is loaded on the image forming apparatus, whereby toner is supplied to the image forming apparatus.

Abstract: A cartridge detachably mountable to a main body of an image forming apparatus comprising: a storage container for storing an image forming material having a supply section for supplying the image forming material when engaged with a main body of the image forming apparatus; and a packaging container for packaging the storage container, the packaging container can expose the supply section of the storage container through an opening provided on the packaging container, while packaging the storage container, wherein the cartridge is loaded on the main body of the image forming apparatus in such a state that the storage container is packaged by the packaging container.

Abstract: An image forming method comprises: fixing an image formed by a toner on a record sheet in a nip member formed by a pressurizing member which is compressibly contacted against a heating fixing rotor having an elastic body layer formed on an endless periphery surface capable of orbitally moving and which creates locally a large distortion occurred in the elastic body layer in vicinity of outlet thereof, wherein the toner includes at least two metal salts having different valence and has a relationship given by the Formula (1). 2.0?a?0.1 1.0?b?0.01 7.5?a/b?1.1 ??Formula (1) wherein a (mass %) is defined as a content of a metal salt which is contained at a highest content in total toner mass and b (mass %) is defined as a content of a metal salt which is contained at a second-highest content in the total toner mass, and mass values of a and b represent anhydride reduced values.

Abstract: The toner for developing an electrostatic image, includes a toner particle containing a binder resin and a colorant. The colorant has Feret's average horizontal diameter from 10 nm to 500 nm, and 50 number % or more of colorant has a Feret's horizontal diameter of from 2 nm to 300 nm.

Abstract: An electrostatic charge image developing toner having: a toner particle having a colorant and a resin; and a surfactant having two or more anionic groups within one molecule in an amount of 10 ppm to 10,000 ppm.