Abstract: Provided is toner which is excellent in developing property, transferring property, and fixing property, hardly affected by its surrounding, and has good endurance. The toner has a peak temperature of maximum endothermic peak in the range of 60 to 100° C.

Abstract: An image-forming method for fixing a toner image onto a recording medium, (i) wherein when a high-gloss recording medium (G0>40) is used, an image is formed at a low-speed mode process speed of from 20 mm/sec. to less than 130 mm/sec. and, where the maximum and minimum gloss values of the fixed image (Gmax1 and Gmin1, respectively), satisfy: Gmax1≦G0+40 and Gmin1≧G0−25; and (ii) wherein when a low-gloss recording medium (0≦G0≦40) is used, an image is formed at a high-speed mode process speed of from 130 mm/sec. to 600 mm/sec. and, where values of the fixed image (Gmax2 and Gmin2, respectively), satisfy: Gmax2≦G0+20 and Gmin2≧G0−15.

Abstract: A magenta toner having a storage elastic modulus at 80° C., G′80, from 1×106 dN/m2 to 1×108 dN/m2 and a storage elastic modulus at 120° C. to 180° C., G′120-180, from 2×103 dN/m2 to 1×106 dN/m2, and containing a compound represented by Formulas (1) and (2) and a compound represented by Formula (3): wherein RD2 represents H or OCH3, RD4 represents H or CONH2, RD5 represents H, SO2N(C2H5)2, CONHC6H5, CONH2 or CONHC6H4-(p)CONH2, RK2 represents H, OCH3, CH3 or OC2H5, RK4 represents H, OCH3 or Cl, and RK5 represents H, OCH3, Cl or NO2; wherein RD2 represents H or SO3—, RD4 represents H, Cl or CH3, RD5 represents H, Cl, CH3, C2H5, or SO3—, and M represents Ba, Ca, Sr, Mn or Mg; provided that one of RD2 and RD5 is SO3. wherein RD1 and RD2 each represent H or CH3.

Abstract: In an image-forming method having a fixing step of fixing a toner image onto a recording medium, and having at least a low-speed mode and a high-speed mode so as to be able to form images at different speeds;

Abstract: A toner characterized by improved fixing performances with no or minimum oil application is formed of: (i) a binder resin, (ii) a colorant, (iii) a hydrocarbon wax, (iv) a resin composition formed by copolymerization of a styrenic monomer together with at least one of nitrogen-containing vinyl monomers, carboxyl group-containing monomers, hydroxyl group-containing monomers and (meth)acrylate ester monomers, in the presence of a hydrocarbon unit; and (v) an organometallic compound. The binder resin (i) comprises a polyester component in a proportion of at least 60 wt. % of the binder resin. The toner has a GPC molecular weight distribution including a weight-average molecular weight (Mw) of at least 4.0×104 an a ratio Mw/Mn of at least 50 between the Mw and a number-average molecular weight (Mn).

Abstract: A toner, particularly a color toner suitable for full-color image formation through a substantially oil-less heat-pressure fixing device, is formed from at least a binder resin, a colorant and a wax. The toner has viscoelasticity including: a storage modulus at 80° C. (G′80) in a range of 1×106-1×1010 dN/m2, storage moduli at temperatures of 120-180° C. (G′120-180) in a range of 5×103-1×106 dN/m2, and loss tangents (tan &dgr;=G″/G′ as a ratio between G″ (loss modulus) and G′ (storage molecules)) including a loss tangent at 180° C. (tan &dgr;180) and a minimum of loss tangents over a temperature range of 120-180 ° C. (tan &dgr;min) satisfying 1≦tan &dgr;180/tan &dgr;min. The toner further exhibits a thermal behavior providing a heat-absorption curve according to differential scanning calorimetry (DSC) showing a maximum heat-absorption peak temperature in a range of 50-110° C. in a temperature range of 30-200° C.

Abstract: In a two-component development system containing a toner and a carrier, an a-Si photosensitive member having a diameter of from 20 mm to 80 mm is used, the photosensitive member is electrostatically charged to have a surface potential of from 300 to 450 V (absolute value), and yellow, magenta, cyan and black toners are used each of which have a weight-average particle diameter of from 4.0 &mgr;m to 10.0 &mgr;m, and, under a condition that the carrier of the two-component developer has a 50% average particle diameter of from 10 &mgr;m to 80 &mgr;m and as image density (D0.5) measured usually after the toner is fixed once when the quantity of unfixed toner on a transfer medium, M/S, is 0.5 mg/cm2, have a coloring power of from 1.0 to 1.9, and in which the difference between a maximum value and a minimum value of D0.5 of yellow, magenta, cyan and black colors is form 0 to 0.5. This makes it possible to obtain high-quality images in a high image density and a superior color reproduction.

Abstract: A toner, particularly a color toner suitable for full-color image formation through a substantially oil-less heat-pressure fixing device, is formed from at least a binder resin, a colorant and a wax. The binder resin comprises a polyester-based resin selected from the group consisting of (a) a polyester resin, (b) a hybrid resin having a polyester unit and a vinyl polymer unit, and (c) a mixture of these resins. The wax is characterized by including a structural unit including an OH group, an amide, or an ester group at a specific position.

Abstract: A toner, particularly a color toner suitable for full-color image formation through a substantially oil-less heat-pressure fixing device, is formed from at least a binder resin, a colorant and a wax. The binder resin comprises a polyester-based resin selected from the group consisting of (a) a polyester resin, (b) a hybrid resin having a polyester unit and a vinyl polymer unit, and (c) a mixture of these resins. The wax is characterized by including a structural unit including an OH group, an amide, or an ester group at a specific position.

Abstract: A toner, particularly a color toner suitable for full-color image formation through a substantially oil-less heat-pressure fixing device, is formed from at least a binder resin, a colorant and a wax. The toner has viscoelasticity including: a storage modulus at 80° C. (G′80) in a range of 1×106-1×1010 dN/m2, storage moduli at temperatures of 120-180 ° C. (G′120-180) in a range of 5×103-1×106 dN/m2, and loss tangents (tan &dgr;=G″/G′ as a ratio between G″ (loss modulus) and G′ (storage molecules)) including a loss tangent at 180° C. (tan &dgr;180) and a minimum of loss tangents over a temperature range of 120-180 ° C. (tan &dgr;min) satisfying 1≦tan &dgr;180/tan &dgr;min. The toner further exhibits a thermal behavior providing a heat-absorption curve according to differential scanning calorimetry (DSC) showing a maximum heat-absorption peak temperature in a range of 50-110 ° C. in a temperature range of 30-200° C.

Abstract: In a two-component development system containing a toner and a carrier, an a-Si photosensitive member having a diameter of from 20 mm to 80 mm is used, the photosensitive member is electrostatically charged to have a surface potential of from 300 to 450 V (absolute value), and yellow, magenta, cyan and black toners are used each of which have a weight-average particle diameter of from 4.0 &mgr;m to 10.0 &mgr;m, and, under a condition that the carrier of the two-component developer has a 50% average particle diameter of from 10 &mgr;m to 80 &mgr;m and as image density (D0.5) measured usually after the toner is fixed once when the quantity of unfixed toner on a transfer medium, M/S, is 0.5 mg/cm2, have a coloring power of from 1.0 to 1.9, and in which the difference between a maximum value and a minimum value of D0.5 of yellow, magenta, cyan and black colors is form 0 to 0.5. This makes it possible to obtain high-quality images in a high image density and a superior color reproduction.

Abstract: A magenta toner containing at least a binder resin and a colorant; the magenta toner having a storage elastic modulus at a temperature of 80° C., G′80, in the range of from 1×106 dN/m2 to 1×108 dN/m2 and a storage elastic modulus at a temperature of from 120° C. to 180° C., G′120-180, in the range of from 2×103 dN/m2 to 1×106 dN/m2, and containing at least a compound selected from the group consisting of compounds represented by the following Formulas (1) and (2) and a compound represented by the following Formula (3).

Abstract: A toner includes at least a polyester resin having a carboxyl group, a coloring agent, 0.1-10 mass % of a metal salicylate compound with respect to a mass of the toner and 20-400 ppm of a hindered phenol with respect to the mass of the toner.

Abstract: A toner is disclosed which has toner particles and an external additive. The toner has (a) in circularity distribution of particles measured with a flow type particle image analyzer, an average circularity of from 0.920 to 0.995, containing particles with a circularity of less than 0.950 in an amount of from 2% by number to 40% by number; and (b) a weight-average particle diameter of from 2.0 .mu.m to 9.0 .mu.m as measured by Coulter method. The external additive has, on the toner particles, at least (i) an inorganic fine powder (A) present in the state of primary particles or secondary particles and having an average particle length of from 10 m.mu.m to 400 m.mu.m and a shape factor SF-1 of from 100 to 130 and (ii) a non-spherical inorganic fine powder (B) formed by coalescence of a plurality of particles and having a shape factor SF-1 of greater than 150. Also, a two-component developer and an image forming method, using the toner, are disclosed.

Abstract: A yellow toner for developing electrostatic images is formed of yellow toner particles containing a binder resin and a yellow colorant. The yellow toner has a storage modulus G'.sub.180 at 180.degree. C. and a minimum storage modulus G'.sub.min(120-170) in a temperature range of 120-170.degree. C. giving a ratio [G'.sub.180 /G'.sub.min(120-170) ] of 2.0-8.0. The binder resin comprises a polyester resin having a glass transition temperature of 50-65.degree. C. and an acid value of 2.0-25.0 mgKOH/g. The yellow toner is a compound represented by Formula (1) below:Formula (1): ##STR1## The primary particles of the yellow colorant exhibit a length/breadth ratio of at most 1.5. The yellow colorant is dispersed in the toner particles as independent particles (including primary particles and secondary particles) providing a number-average particle size of 0.1-0.7 .mu.m. The yellow toner is provided with improved fixability and anti-offset property as well as good color toner performances.

Abstract: A color toner has (i) color toner particles containing at least a binder resin and a colorant and (ii) an external additive. The color toner has a weight-average particle diameter of 5 to 8 .mu.m and a number-average particle diameter of 4.5 to 7.5 .mu.m, and contains 5 to 40% by number of particles having a particle diameter of 4 .mu.m or less in the number distribution of the color toner and 7% by volume or less of particles having a particle diameter of 10.08 .mu.m or more in the volume distribution of the color toner. The inorganic powder selected from the group consisting of a strontium titanate powder, a cerium oxide powder and a calcium titanate powder, and a hydrophobic fine alumina powder are externally added to the color toner particles as the external additives, the inorganic powder has a longitudinal average particle diameter of 0.2 to 2 .mu.m, and the hydrophobic fine alumina powder has a longitudinal average particle diameter of 0.005 to 0.1 .mu.m.

Abstract: A toner contains toner particles and fine alumina particles. The toner particles include a binding resin and a colorant. The fine alumina particles contain 200 to 700 .mu.g of zirconium compound per gram of alumina. The toner may be used as a one-component developer or as a two-component developer with a carrier.

Abstract: A toner for developing an electrostatic image is disclosed which has toner particles and hydrophobic fine titanium oxide particles. The hydrophobic fine titanium oxide particles have, in X-ray diffraction, an intensity ration Ia/Ib of 5.0.ltoreq.Ia/Ib.ltoreq.12.0 which is a ratio of maximum intensity Ia to minimum intensity Ib within the range of 2.theta.=20.0 to 40.0 deg.

Abstract: A magenta toner for developing electrostatic images is formed of a binder resin, and a quinacridone pigment providing an X-ray diffraction spectrum showing two peaks in a Bragg angle (2.theta.) region of 5-10 deg. The magenta toner has an improved light fastness, may have a desired hue comparable to a printing process ink and is suitably used for electrophotographic full-color image formation. The magenta toner may preferably be formed through a process including a first kneading step starting from wet blending of a binder resin and two paste pigments including quinacridone and 2,9-dimethylquinacridone, respectively, under mild conditions not causing crystal transformation to form a master batch and a second kneading step of diluting the master batch together with other additive.

Abstract: A toner for developing an electrostatic image is formed from toner particles containing at least a binder resin, a colorant and an organometallic compound. The binder resin in the toner particles has a tetrahydrofuran-insoluble (THF-insoluble) content of at most 5.0 wt.% based on the binder resin. The toner has a glass transition temperature of 50.degree.-80.degree. C. The toner further has storage modulus characteristics including a storage modulus at 80.degree. C. (G'.sub.80) of 1.times.10.sup.4 -5.times.10.sup.6 ?dyn/cm.sup.2 !, a storage modulus at 130.degree. C. (G'.sub.130) providing a ratio G'.sub.80 /G'.sub.130 of 10-5.times.10.sup.3, and a storage modulus curve showing a minimum (G'min) in a temperature region of 110.degree.-190.degree. C. The toner especially exhibits excellent low-temperature fixability, anti-high temperature offset characteristic, storage stability and color-miscibility.