Patent application number | Description | Published |
20090253067 | WET DEVELOPER - To provide a wet developer which is capable of improving fixability, while ensuring a sufficient heat-resistant storage property. The wet developer contains toner particles composed of a colorant and a binder resin, which are dispersed in a non-volatile carrier solution by using a dispersant. As the binder resin, a polyester resin, which has an alcohol component containing a mixture of an ethylene oxide adduct of bisphenol A and a propylene oxide adduct of bisphenol A, with a ratio thereof being 1:19 to 10:10 (weight ratio), is used. | 10-08-2009 |
20130115552 | LIQUID DEVELOPER - A liquid developer used for wet-type image forming apparatuses includes toner particles and an insulating liquid, the toner particles include a resin, a pigment, and a pigment dispersant, the pigment includes a pigment having an acid group, and the pigment dispersant is a basic polymer dispersant including units derived from ε-caprolactone. | 05-09-2013 |
20140087300 | LIQUID DEVELOPER AND METHOD FOR MANUFACTURING THE SAME - Toner particles contained in a liquid developer have a core-shell structure that first resin particles containing a first resin are attached to or cover surfaces of second resin particles containing a second resin. The second resin satisfies Equations (1) to (2) below. In Equations (1) to (2) below, x represents a number average molecular weight of the second resin and y represents a urethane group concentration (mass %) in the second resin. | 03-27-2014 |
20140087302 | LIQUID DEVELOPER AND METHOD FOR MANUFACTURING THE SAME - In a liquid developer in which toner particles are dispersed in an insulating liquid, the toner particles have a core-shell structure that first resin particles containing a first resin are attached to or cover surfaces of second resin particles containing a second resin. The second resin particles further contain a pigment and a dispersant for pigment, and solubility of the dispersant for pigment in the insulating liquid is not higher than 10 mass % at 25° C. | 03-27-2014 |
20140087304 | LIQUID DEVELOPER AND METHOD FOR MANUFACTURING THE SAME - Toner particles have a core-shell structure that first resin particles containing a first resin are attached to or cover surfaces of second resin particles containing a second resin. Heat of fusion with differential scanning calorimetry of the second resin satisfies Equations (1) to (2) below. In Equations (1) to (2) below, H1 and H2 represent heats of fusion (J/g) at initial temperature increase and second temperature increase with differential scanning calorimetry of the second resin, respectively. | 03-27-2014 |
20140234769 | LIQUID DEVELOPER - A liquid developer includes an insulating liquid and a plurality of toner particles. The plurality of toner particles has a median size not smaller than 1 μm and not greater than 3 μm as a whole. In the plurality of toner particles, average circularity is not smaller than 0.90 and not greater than 0.96, and a standard deviation of circularity is not smaller than 0.02 and not greater than 0.10. | 08-21-2014 |
20140234770 | LIQUID DEVELOPER - A liquid developer includes an insulating liquid and a plurality of toner particles. The plurality of toner particles has a volume-based median size not smaller than 0.5 μm and not greater than 3 μm as a whole, and a volume-based coefficient of variation not lower than 40% and not higher than 130%. The plurality of toner particles includes a first toner particle group of the toner particles having a particle size not greater than 1 μm. The number of toner particles constituting the first toner particle group occupies not lower than 20% of the total number of toner particles. The toner particles in the first toner particle group have an average circularity not smaller than 0.945. | 08-21-2014 |
20140370436 | LIQUID DEVELOPER - A liquid developer includes an insulating liquid and toner particles dispersed in the insulating liquid. The insulating liquid has a flash point not lower than 100° C. The toner particles contain a resin, and the resin contains 80 mass % or more of a first resin containing a component derived from a polyester resin. A solid content of the liquid developer corresponding to a portion of the liquid developer excluding the insulating liquid satisfies relation of G′(T | 12-18-2014 |
20150086919 | LIQUID DEVELOPER AND IMAGE FORMATION METHOD - A resin in a liquid developer contains 80 mass % or more of a urethane-modified polyester resin. A component derived from a polyester resin contains a constitutional unit derived from an acid component and a constitutional unit derived from an alcohol component. A ratio of a constitutional unit derived from an aliphatic monomer occupied in the constitutional unit derived from the acid component and the constitutional unit derived from the alcohol component is not lower than 90 mass %. Relation of |T | 03-26-2015 |
20150086920 | LIQUID DEVELOPER - A resin in a liquid developer contains a first resin which is a urethane-modified polyester resin resulting from increase in chain length of a component derived from a polyester resin by a compound containing an isocyanate group and a second resin. The first resin is contained by not lower than 70 mass % with respect to a total of the first resin and the second resin. The component derived from the polyester resin includes a constitutional unit derived from an acid component and a constitutional unit derived from an alcohol component. A ratio of a constitutional unit derived from an aliphatic monomer occupied in the constitutional unit derived from the acid component and the constitutional unit derived from the alcohol component is not lower than 80 mass %. Relation of 2.3≦Mw/Mn≦4(10000≦Mn≦50000) is satisfied. | 03-26-2015 |