Abstract: The toner of the present invention includes toner particles containing polyester resins A and B and a colorant, the A has a polyester portion including a portion capable of forming a crystal structure and a crystal nucleating agent portion, which is bonded to an end of the polyester portion, the B is free from any portions capable of forming a crystal structure, in a chart obtained as a result of GPC of a THF-soluble matter of the B, a ratio of a component having a molecular weight of 1500 or less in the B is 5.0 to 15.0% by area, and when an SP value of the polyester portion of the A is represented by Sa ((cal/cm3)1/2) and an SP value of the B is represented by Sb ((cal/cm3)1/2), the SP values Sa and Sb satisfy the following relationships: 9.50?Sa?11.00 ?0.65?Sb?Sa?0.70.

Abstract: Provided is a toner exhibiting satisfactory fixability even in high-speed fixing process involving a double-sided printing mechanism, keeping stable toner image even after a conveyance step, and doesn't cause curling to a fixing roller even in thin paper. In a toner including toner particles, each of which contains polyester resins A and B, a coloring agent, and a resin composition C, the resin A includes a crystal nucleating agent bonded to a polyester molecular chain including a moiety capable of forming a crystalline structure. The resin B doesn't include a moiety capable of forming a crystalline structure. The composition C is obtained by copolymerizing a vinyl-based resin component with a polyolefin resin component. SP values the resin A, the resin B, the agent, the polyolefin component, and the vinyl-based component satisfy the particular relationships.

Abstract: Provided is the following magnetic carrier. The magnetic carrier maintains high developing performance even when the number of sheets to be output is large. Its charge-providing performance hardly reduces even when toner or an external additive is spent on the magnetic carrier. In addition, the magnetic carrier is strong in resistance against standing. The magnetic carrier includes a magnetic carrier core and a resinous coating layer formed on a surface of the magnetic carrier core, in which the resinous coating layer contains a resin composition and silica-alumina composite particles.

Abstract: Provided is a toner satisfying low-temperature fixing performance and long-term storage stability of fixed images. Further, provided is a toner capable of obtaining toner images excellent in long-term storage stability irrespective of use environments even in the case where images are formed by a high-speed fixing system having low internal pressure of a fixing nip of a fixing device and a high printing speed. The toner includes toner particles containing a binder resin having a resin A and B, and a coloring agent, in which the resin A includes a resin including a moiety capable of forming a crystalline structure; the resin B includes a resin free of a moiety capable of forming a crystalline structure; and ?Hhigh and ?Hlow satisfy the expressions: 2??Hhigh?45 3[%]?{(?Hlow??Hhigh)/?Hlow}×100?70[%] where ?Hhigh and ?Hlow represent a heat of melting derived from the binder resin measured at a temperature increase speed of 100° C./min and 10° C./min, respectively.

Abstract: A magnetic toner having a toner particle containing a binder resin and a magnetic member, a first inorganic fine particle and an organic-inorganic composite particle on the surface of the toner particle, wherein the organic-inorganic composite particle i) has a structure in which a second inorganic fine particle is embedded in a resin particle, and ii) is contained in an amount of 0.5 mass % or more and 3.0 mass % or less based on the mass of the toner; the first inorganic fine particle contains an inorganic oxide fine particle selected from the group consisting of a silica fine particle, a titanium oxide fine particle and an alumina fine particle; has a number average particle diameter (D1) of 5 nm or more and 25 nm or less, and contains the silica fine particle in an amount of 85 mass % or more based on the inorganic oxide fine particle.

Abstract: A toner is provided including large particle-diameter external additives with sweep to the concaves of a toner particle suppressed, so that the large particle-diameter external additives function as spacer particles for a long period. The toner includes toner particles which contain a binder resin and magnetic material, and organic-inorganic composite fine particles having a structure including inorganic fine particles embedded in a vinyl resin particle. The presence state of the magnetic material on the toner particle surface satisfies specific conditions and the presence state of the organic-inorganic composite fine particles on the toner surface satisfies specific conditions.

Abstract: An object of the present invention is to provide a two-component developer which can achieve a high-definition image with a smaller toner laid-on level than a conventional one, provides a color gamut comparable to that of printing, can respond to an increase in printing speed, and allows an image with a stable tinge to be formed even in long-term use. The object can be achieved by a two-component developer containing a cyan toner and a magnetic carrier, the two-component developer being characterized in that the cyan toner has the following characteristics: (i) when the concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and the absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the relationship of 2.00<A712/Cc<8.15; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 25.0?L*?40.0 and 50.0?C*?60.

Abstract: Provided is a toner satisfying low-temperature fixing performance and long-term storage stability of fixed images. Further, provided is a toner capable of obtaining toner images excellent in long-term storage stability irrespective of use environments even in the case where images are formed by a high-speed fixing system having low internal pressure of a fixing nip of a fixing device and a high printing speed. The toner includes toner particles containing a binder resin having a resin A and B, and a coloring agent, in which the resin A includes a resin including a moiety capable of forming a crystalline structure; the resin B includes a resin free of a moiety capable of forming a crystalline structure; and ?Hhigh and ?Hlow satisfy the expressions: 2??Hhigh?45 3[%]?{(?Hlow??Hhigh)/?Hlow}×100?70[%] where ?Hhigh and ?Hlow represent a heat of melting derived from the binder resin measured at a temperature increase speed of 100° C./min and 10° C./min, respectively.

Abstract: The toner of the present invention includes toner particles containing polyester resins A and B and a colorant, the A has a polyester portion including a portion capable of forming a crystal structure and a crystal nucleating agent portion, which is bonded to an end of the polyester portion, the B is free from any portions capable of forming a crystal structure, in a chart obtained as a result of GPC of a THF-soluble matter of the B, a ratio of a component having a molecular weight of 1500 or less in the B is 5.0 to 15.0% by area, and when an SP value of the polyester portion of the A is represented by Sa ((cal/cm3)1/2) and an SP value of the B is represented by Sb ((cal/cm3)1/2), the SP values Sa and Sb satisfy the following relationships: 9.50?Sa?11.00 ?0.65?Sb?Sa?0.70.

Abstract: The toner includes toner particles containing a polyester resin A, a polyester resin B and a colorant, the polyester resin A has a polyester portion including a segment capable of forming a crystal structure and a crystal nucleating agent segment, which is bonded to an end of the polyester portion, and the polyester resin B is a resin which is free of any segments capable of forming a crystal structure, the polyester resin B has a weight average molecular weight Mwb by GPC of a THF soluble matter of 3000 or more and 100000 or less, and an SP value Sa ((cal/cm3)1/2) of the polyester portion of the polyester resin A and an SP value Sb ((cal/cm3)1/2) of the polyester resin B satisfy the following relationships: 9.00?Sa?10.50 ?0.40?Sb?Sa?0.80.

Abstract: Provided is the following magnetic carrier. The magnetic carrier maintains high developing performance even when the number of sheets to be output is large. Its charge-providing performance hardly reduces even when toner or an external additive is spent on the magnetic carrier. In addition, the magnetic carrier is strong in resistance against standing. The magnetic carrier includes a magnetic carrier core and a resinous coating layer formed on a surface of the magnetic carrier core, in which the resinous coating layer contains a resin composition and silica-alumina composite particles.

Abstract: Provided is a toner exhibiting satisfactory fixability even in high-speed fixing process involving a double-sided printing mechanism, keeping stable toner image even after a conveyance step, and doesn't cause curling to a fixing roller even in thin paper. In a toner including toner particles, each of which contains polyester resins A and B, a coloring agent, and a resin composition C, the resin A includes a crystal nucleating agent bonded to a polyester molecular chain including a moiety capable of forming a crystalline structure. The resin B doesn't include a moiety capable of forming a crystalline structure. The composition C is obtained by copolymerizing a vinyl-based resin component with a polyolefin resin component. SP values the resin A, the resin B, the agent, the polyolefin component, and the vinyl-based component satisfy the particular relationships.

Abstract: A two-component developer containing a cyan toner and a magnetic carrier, the cyan toner having the following characteristics: (i) when the concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and the absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the relationship of 2.00<A712/Cc<8.15; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 25.0?L*?40.0 and 50.0?C*?60.0; and (iii) the absolute value for the triboelectric charge quantity of the cyan toner measured by a two-component method using the cyan toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.

Abstract: Provided is a developer for replenishment capable of forming a high-quality image even upon duration. The developer for replenishment includes at least a toner and a magnetic carrier, and in the developer for replenishment, 1 part by mass of the magnetic carrier is blended with 2 to 50 parts by mass of the toner, and the magnetic carrier contains a ferrite core and a resin component, has a true specific gravity of 2.5 to 4.2 g/cm3, has a 50% particle diameter on a volume basis (D50) of 15 to 70 ?m, and has an average circularity of 0.850 to 0.950, the average circularity having a coefficient of variation of 1.0 to 10.0%.

Abstract: A two-component developer containing a yellow toner and a magnetic carrier, wherein the yellow toner has the characteristics: (i) when the concentration of the yellow toner in a solution of the yellow toner in chloroform is represented by Cy (mg/ml) and the absorbance of the solution at a wavelength of 422 nm is represented by A422, a relationship between Cy and A422 satisfies the relationship of 6.00<A422/Cy<14.40; (ii) the lightness L* and chroma C* of the yellow toner determined in a powder state satisfy the relationships of 85.0?L*?95.0 and 100.0?C*?115.0; and (iii) the absolute value for the triboelectric charge quantity of the yellow toner measured by a two-component method using the yellow toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.

Abstract: An object of the present invention is to provide a two-component developer which can achieve a high-definition image with a smaller toner laid-on level than a conventional one, provides a color gamut comparable to that of printing, can respond to an increase in printing speed, and allows an image with a stable tinge to be formed even in long-term use. The object can be achieved by a two-component developer containing a cyan toner and a magnetic carrier, the two-component developer being characterized in that the cyan toner has the following characteristics: (i) when the concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and the absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the relationship of 2.00<A712/Cc<8.15; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 25.0?L*?40.0 and 50.0?C*?60.

Abstract: A two-component developer containing a cyan toner and a magnetic carrier, wherein the cyan toner has the characteristics: (i) when the concentration of the cyan toner in a solution of the cyan toner in chloroform is represented by Cc (mg/ml) and the absorbance of the solution at a wavelength of 712 nm is represented by A712, a relationship between Cc and A712 satisfies the relationship of 2.00<A712/Cc<8.15; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 25.0?L*?40.0 and 50.0?C*?60.0; and (iii) the absolute value for the triboelectric charge quantity of the cyan toner measured by a two-component method using the cyan toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.

Abstract: A two-component developer containing a magenta toner and a magnetic carrier, wherein the magenta toner has the characteristics: (i) when the concentration of the magenta toner in a solution of the magenta toner in chloroform is represented by Cm (mg/ml) and the absorbance of the solution at a wavelength of 538 nm is represented by A538, a relationship between Cm and A538 satisfies the relationship of 2.00<A538/Cm<6.55; (ii) the lightness L* and chroma C* of the cyan toner determined in a powder state satisfy the relationships of 35.0?L*?45.0 and 60.0?C*?72.0; and (iii) the absolute value for the triboelectric charge quantity of the magenta toner measured by a two-component method using the magenta toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.

Abstract: A two-component developer containing a yellow toner and a magnetic carrier, wherein the yellow toner has the characteristics: (i) when the concentration of the yellow toner in a solution of the yellow toner in chloroform is represented by Cy (mg/ml) and the absorbance of the solution at a wavelength of 422 nm is represented by A422, a relationship between Cy and A422 satisfies the relationship of 6.00<A422/Cy<14.40; (ii) the lightness L* and chroma C* of the yellow toner determined in a powder state satisfy the relationships of 85.0?L*?95.0 and 100.0?C*?115.0; and (iii) the absolute value for the triboelectric charge quantity of the yellow toner measured by a two-component method using the yellow toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.

Abstract: A two-component developer containing a magenta toner and a magnetic carrier, wherein the magenta toner has the characteristics: (i) when the concentration of the magenta toner in a solution of the magenta toner in chloroform is represented by Cm (mg/ml) and the absorbance of the solution at a wavelength of 538 nm is represented by A538, a relationship between Cm and A538 satisfies the relationship of 2.00<A538/Cm<6.55; (ii) the lightness L* and chroma C* of the magenta toner determined in a powder state satisfy the relationships of 35?L*?45 and 60?C*?72; and (iii) the absolute value for the triboelectric charge quantity of the magenta toner measured by a two-component method using the magenta toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less.