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| 20090004589 | Toner and Process for Producing the Same - The present invention provides toner containing core particles prepared by mixing and aggregating in an aqueous medium at least a first resin particle dispersion in which first resin particles are dispersed, a colorant particle dispersion in which particles of colorant are dispersed and a wax particle dispersion in which particles of wax are dispersed. The colorant contains carbon black having a DBP oil absorption of 45 to 70 (ml/100 g) and the wax contains a wax having an endothermic peak temperature (referred to as melting point Tmw1 (° C.)) according the DSC method of 50 to 90° C. It is thus possible to prepare toner that has a small particle size and a sharp particle size distribution without requiring a classification process and that can prevent transfer void and toner scattering during transfer and obtain high transfer efficiency. The present invention provides also a method for producing the toner. | 01-01-2009 |
| 20090035681 | TONER, PROCESS FOR PRODUCING TONER, AND TWO-COMPONENT DEVELOPING AGENT - A toner or two-component developer is obtained by mixing, aggregating, and heating resin particles, colorant particles, and wax particles in an aqueous medium. A gel permeation chromatography (GPC) measurement of the resin particles shows that a weight-average molecular weight is 10000 to 60000, and the ratio of the weight-average molecular weight to a number-average molecular weight is 1.5 to 6. The wax particles include at least a first wax and a second wax. An endothermic peak temperature (melting point Tmw | 02-05-2009 |
| 20090035682 | TONER AND PROCESS FOR PRODUCING THE SAME - A toner of the present invention includes a first wax and a second wax. The endothermic peak temperature of the first wax by the DSC method is 50° C. to 90° C. The endothermic peak temperature of the second wax is 5° C. to 50° C. higher than that of the first wax. Jmw | 02-05-2009 |
| 20090233203 | TONER AND METHOD FOR PRODUCING THE SAME - The present invention provides a toner comprising core particles that contain at least first resin particles, colorant particles, and wax particles, in an aqueous medium, wherein the core particles contain nucleus particles in which the first resin particles and the colorant particles are aggregated and particles in which the first resin particles and the wax particles are aggregated. Accordingly, the treatment time for forming the core particles can be shortened, generation of colorant particles or wax particles that are not aggregated but suspended in a liquid can be suppressed, and particles having a small particle size and a sharp particle size distribution can be formed without classification, by suppressing an increase in the size of core particles. | 09-17-2009 |
| 20100104971 | TONER, METHOD FOR PRODUCING TONER, TWO COMPONENT DEVELOPER, AND IMAGE FORMING APPARATUS - First toner of the present invention includes colored particles and an external additive. The colored particles are produced by heating and aggregating a mixture that includes a resin particle dispersion in which first resin particles are dispersed and a pigment particle dispersion in which pigment particles are dispersed, so that at least part of the first resin particles is melted. The colored particles have a finely roughened surface. Second toner of the present invention includes aggregated particles including at least first resin particles and pigment particles, and colored particles having a finely roughed surface formed by fusing at least part of wax and at least part of second resin particles on the surface of the aggregated particles. Third toner of the present invention includes aggregated particles including at least first resin particles and pigment particles, and colored particles having a finely roughened surface formed by fusing at least part of third resin particles and at least part of fourth resin particles on the surface of the aggregated particles. When the aggregated particles are formed in an aqueous medium, the pH is controlled in the specified range. The toner can achieve oilless fixing that prevents offset without using oil while maintaining high OHP transmittance. Therefore, it is possible to eliminate the spent of toner components on a carrier and to make the life longer. Moreover, thinning or scattering during transfer can be suppressed, thus ensuring high transfer efficiency. | 04-29-2010 |
| 20110165510 | TONER, PROCESS FOR PRODUCING TONER, AND TWO-COMPONENT DEVELOPING AGENT - A toner or two-component developer is obtained by mixing, aggregating, and heating resin particles, colorant particles, and wax particles in an aqueous medium. A gel permeation chromatography (GPC) measurement of the resin particles shows that a weight-average molecular weight is 10000 to 60000, and the ratio of the weight-average molecular weight to a number-average molecular weight is 1.5 to 6. The wax particles include at least a first wax and a second wax. An endothermic peak temperature (melting point Tmw1 (° C.)) of the first wax based on a DSC method is 50° C. to 90° C. An endothermic peak temperature (melting point Tmw2 (° C.)) of the second wax based on the DSC method is at least 5° C. to 50° C. higher than Tmw1. Thus, the toner can have a smaller particle size and a sharp particle size distribution without requiring a classification process, can achieve a longer life, and can suppress transfer voids or scattering during transfer. | 07-07-2011 |
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| 20080206665 | Toner, method for producing toner, two component developer, and image forming apparatus - First toner of the present invention includes colored particles and an external additive. The colored particles are produced by heating and aggregating a mixture that includes a resin particle dispersion in which first resin particles are dispersed and a pigment particle dispersion in which pigment particles are dispersed, so that at least part of the first resin particles is melted. The colored particles have a finely roughened surface. Second toner of the present invention includes aggregated particles including at least first resin particles and pigment particles, and colored particles having a finely roughed surface formed by fusing at least part of wax and at least part of second resin particles on the surface of the aggregated particles. Third toner of the present invention includes aggregated particles including at least first resin particles and pigment particles, and colored particles having a finely roughened surface formed by fusing at least part of third resin particles and at least part of fourth resin particles on the surface of the aggregated particles. When the aggregated particles are formed in an aqueous medium, the pH is controlled in the specified range. The toner can achieve oilless fixing that prevents offset without using oil while maintaining high OHP transmittance. Therefore, it is possible to eliminate the spent of toner components on a carrier and to make the life longer. Moreover, thinning or scattering during transfer can be suppressed, thus ensuring high transfer efficiency. | 08-28-2008 |
| 20080268368 | Toner, method for producing toner, two-component developer, and image forming apparatus - Toner of the present invention includes aggregated particles formed by aggregating at least resin particles, pigment particles, and wax particles in an aqueous medium in the presence of a water-soluble inorganic salt. The wax includes at least one selected from the following: ester wax that has an iodine value of not more than 25, a saponification value of 30 to 300, and an endothermic peak temperature (melting point) of 50° C. to 100° C. based on a DSC method; and wax that is obtained by a reaction of alkyl alcohol having a carbon number of 4 to 30, unsaturated polycarboxylic acid or its anhydride, and synthetic hydrocarbon wax, and has an acid value of 1 to 80 mgKOH/g and an endothermic peak temperature (melted point) of 50° C. to 120° C. based on the DSC method. The toner and a two-component developer can achieve oilless fixing that prevents offset without using oil while maintaining high OHP transmittance, can eliminate spent of the toner components on a carrier to make the life longer, and can ensure high transfer efficiency by suppressing transfer voids or scattering during transfer. | 10-30-2008 |
