Patent application number | Description | Published |
20130164044 | DEVELOPING APPARATUS, DEVELOPING METHOD AND MAGNETIC TONER FOR DEVELOPING APPARATUS - An object of the present invention is to provide a developing apparatus which can provide images having superior image density and less fogging. | 06-27-2013 |
20140322639 | MAGNETIC TONER - A magnetic toner contains magnetic toner particles containing a binder resin, a release agent, and a magnetic body and inorganic fine particles present on the surface of the magnetic toner particles, wherein the inorganic fine particles present on the surface of the magnetic toner particles contain metal oxide fine particles, the metal oxide fine particles containing silica fine particles, and optionally containing titania fine particles and alumina fine particles, and a content of the silica fine particles being at least 85 mass % with respect to a total mass of the silica fine particles, the titania fine particles and the alumina fine particles, the coverage ratio of the magnetic toner particles' surface by the inorganic fine particles and the coverage ratio by the inorganic fine particles fixed to the magnetic toner particles' surface reside in a prescribed relationship, the binder resin contains a polyester resin, the release agent contains an ester compound, and an endothermic peak for the magnetic toner has a prescribed value. | 10-30-2014 |
20140335449 | MAGNETIC TONER - A magnetic toner including: magnetic toner particles containing a binder resin, a magnetic body, and a release agent; and inorganic fine particles present on the surface of the magnetic toner particles, wherein the inorganic fine particles present on the surface of the magnetic toner particles contain metal oxide fine particles, the metal oxide fine particles containing silica fine particles, and optionally containing titania fine particles and alumina fine particles, and a content of the silica fine particles being at least 85 mass % with respect to a total mass of the silica fine particles, the titania fine particles and the alumina fine particles, wherein the magnetic toner has a coverage ratio A of the magnetic toner particles' surface by the inorganic fine particles and a coverage ratio B of the magnetic toner particles' surface by the inorganic fine particles fixed to the magnetic toner particles' surface that reside in prescribed numerical value ranges; the binder resin contains a styrene resin; the release agent contains a monoester compound or a diester compound; and the softening temperature and softening point of the magnetic toner reside in prescribed temperature ranges. | 11-13-2014 |
20150064617 | TONER - A toner has toner particles including a binder resin, a colorant, an ester wax and a hydrocarbon wax; and inorganic fine particles. The ester wax includes an ester compound having a structure represented by formula (1): R | 03-05-2015 |
20150185643 | DEVELOPING APPARATUS, DEVELOPING METHOD, IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - The present invention provides a developing apparatus including a toner, a toner carrying member and a regulating member, wherein the toner is a magnetic toner including a toner particle, a first fine silica particle having a number average primary particle diameter of 5 to 20 nm and a second fine silica particle having a number average primary particle diameter of 40 to 200 nm, the second fine silica particle is a fine silica particle produced by a sol-gel method, the toner has a total energy of 270 to 355 mJ/(g/ml), the toner carrying member has a substrate, an elastic layer and a surface layer including a urethane resin, and the urethane resin has a partial structure derived from a reaction of a particular amine type compound with a polyisocyanate. | 07-02-2015 |
20150185644 | MAGNETIC TONER - It is intended to provide magnetic toner that produces a stable image density in long-term use and can prevent ghosting under conditions of low-temperature and low-humidity. The present invention provides magnetic toner including magnetic toner particles each containing a binder resin, a magnetic material and a releasing agent, and silica fine particles, wherein the silica fine particles include silica fine particles A and B, the silica fine particles A have a number-average particle size of 5-20 nm as primary particles, the silica fine particles B are produced by a sol-gel method, and have a number-average particle size of 40-200 nm as primary particles, an abundance ratio of secondary particles of the silica fine particles B is 5-40% by number, and a coverage ratio X1 of the surface of the magnetic toner particles with the silica fine particles determined by ESCA is 40.0-75.0% by area. | 07-02-2015 |
20150185648 | TONER - It is intended to provide toner that has favorable fixability, releasability and few negative effects on images. The present invention provides toner including toner particles each containing a binder resin, a colorant and an ester wax, and silica fine particles, wherein: the ester wax contains a plurality of esters represented by R1-COO—(CH | 07-02-2015 |
20150185655 | IMAGE-FORMING APPARATUS, IMAGE-FORMING METHOD, DEVELOPING APPARATUS, AND DEVELOPING METHOD - Provided is a developing apparatus, including toner for developing an electrostatic latent image, a toner carrier for carrying the toner, and a regulating member for regulating a layer thickness of the toner carried by the toner carrier. The toner carrier is placed to be brought into contact with the electrostatic latent image bearing member. The toner carrier includes a substrate, an elastic layer, and a surface layer containing a urethane resin. The urethane resin has a partial structure derived from a reaction between a compound represented by the structural formula (1) and a polyisocyanate. The toner contains toner particles each containing a binder resin and a magnetic material, and inorganic fine particles. The toner has a weight average particle diameter (D4) of from 9.5 μm to 14.0 μm. The toner has a porosity of 50 or more and 56 or less. | 07-02-2015 |
20150185657 | DEVELOPING APPARATUS, DEVELOPING METHOD, IMAGE-FORMING APPARATUS, AND IMAGE-FORMING METHOD - Provided is a developing apparatus, including: a toner for developing an electrostatic latent image; a toner carrier for carrying the toner; and a regulating member for regulating a layer thickness of the toner carried by the toner carrier, in which: the toner includes a toner containing toner particles each containing a binder resin and a magnetic material, and inorganic fine particles present on surfaces of the toner particles; the toner has a dielectric loss factor (∈″) at a frequency of 100 kHz and a temperature of 30° C. of 0.03 pF/m or more and 0.30 pF/m or less; the toner carrier includes a substrate, an elastic layer, and a surface layer containing a urethane resin; and the urethane resin has a partial structure derived from a reaction between a compound represented by the structural formula (1) and a polyisocyanate. | 07-02-2015 |