Patent application number | Description | Published |
20100159386 | METHOD FOR PRODUCING DEVELOPING AGENT - A method for producing a developing agent, wherein in the formation of aggregated particles, particles in a dispersion liquid have a volume average particle diameter of 2 μm or less when the pH of the dispersion liquid is 7, and also the pH of the dispersion liquid is from 3.0 to 6.9 when the zeta potential of the particles is −30 mV. | 06-24-2010 |
20100209840 | DEVELOPING AGENT AND METHOD FOR PRODUCING THE SAME - As a first dispersion liquid containing first fine particles and a second dispersion liquid containing second fine particles, those satisfy the relationship represented by the following formula (1) are used, and these two dispersion liquids are mixed with each other, and an aggregating agent and a pH adjusting agent are added thereto in sequence, whereby encapsulation is achieved by selective formation of core particles through aggregation of the first fine particles and shells through aggregation of the second fine particles. | 08-19-2010 |
20100310981 | DEVELOPING AGENT AND METHOD FOR PRODUCING THE SAME - According to one embodiment, a method for producing a developing agent includes pulverizing a mixture in the form of coarse particles of a toner material including a coloring agent and a binder resin by mechanical shearing, aggregating and fusing the resulting fine particles. The solid content concentration in a dispersion liquid including the aggregated particles is from 5.0% to 40.0%, the volume average particle diameter of the aggregated particles is from 1.0 μm to 10.0 μm, and the ratio of the standard deviation to the volume average particle diameter is 30.0% or less. | 12-09-2010 |
20110014558 | DEVELOPING AGENT AND METHOD FOR PRODUCING THE SAME - According to one embodiment, a method for producing a developing agent including aggregating fine particles of a toner material containing a binder resin and a coloring agent in a dispersion liquid in which the fine particles are dispersed in an aqueous medium to form aggregated particles, and washing the aggregated particles and drying the washed aggregated particles, forming toner particles is provided. An electrical conductivity of the toner particles is measured by a toner electrical conductivity evaluation method. A sample toner is prepared by adhering an additive to surfaces of the toner particles, and a content ratio of a sodium element to a carbon element in a region to which the additive is not adhered of the toner is measured. The washing of the toner particles is repeated until each of the measurement values becomes a predetermined reference value or less. | 01-20-2011 |
20110123919 | ELECTROPHOTOGRAPHIC TONER AND METHOD FOR PRODUCING ELECTROPHOTOGRAPHIC TONER - A decolorable electrophotographic toner, which is produced by forming a coloring agent that imparts a color to the toner by heating a leuco dye and a color development and erasure controlling agent having a color developable structure that develops a color by reacting with the leuco dye and also having a decolorable structure that erases the color by inhibiting the contact of the leuco dye with the color developable structure in a dispersion liquid, thereby developing a color, pulverizing the coloring agent in the dispersion liquid by a high-pressure pulverization method, obtaining coloring agent particles maintained in a color developed state by cooling the pulverized coloring agent in the dispersion liquid to a temperature lower than the melting initiation temperature of the color development and erasure controlling agent at a cooling rate at which the color development and erasure controlling agent is not crystallized, and aggregating and fusing the coloring agent particles, binder resin particles, and release agent particles. | 05-26-2011 |
20110262851 | ELECTROHPHOTOGRAPHIC TONER - Disclosed is an electrophotographic toner containing a binder resin, a coloring agent, and a release agent, having a volume average particle diameter of 7 μm or less, and having an acid value per unit surface area SAV (mgKOH/m | 10-27-2011 |
20120135345 | DEVELOPER, METHOD FOR PRODUCING THE SAME, AND METHOD FOR EVALUATING THE SAME - According to one embodiment, a developer includes a toner which contains toner particles containing a binder resin and a coloring agent and also contains inorganic fine particles added to the surfaces of the toner particles, and is obtained through sieving after adding the inorganic fine particles to the toner particles, wherein a first adhesion force Fa1 (%) of the inorganic fine particles to the toner particles before sieving and a second adhesion force Fa2 (%) of the inorganic fine particles to the toner particles after sieving satisfy the following formulae (1) and (2). | 05-31-2012 |
20150378270 | ELECTROPHOTOGRAPHIC TONER AND MANUFACTURING METHOD THEREOF, TONER CARTRIDGE AND IMAGE FORMING APPARATUS - The object of the present invention is to provide an electrophotographic toner hardly causing toner scattering and capable of achieving an adequate decorativeness, a manufacturing method thereof, a toner cartridge and an image forming apparatus. In accordance with an embodiment, the electrophotographic toner is a toner in which coloring agent particles are coated by resin. The volume mean diameter of the coloring agent particles is above 6 μm. The ratio (S/V) of the BET specific surface area S (m̂2/g) of the electrophotographic toner to the volume mean diameter V (μm) of the electrophotographic toner is above 0.015. | 12-31-2015 |
Patent application number | Description | Published |
20160054670 | TONER CONTAINING PARTICLES HAVING FLAKY SHAPE AND MADE OF BRIGHT PIGMENT MATERIAL - A toner includes toner particles including particles having a flaky shape and made of bright pigment material and a binder resin coated on the surfaces of the particles. A ratio of an exposed surface area of the particles with respect to a surface area of the toner particles is greater than 0% and equal to or smaller than 20%. | 02-25-2016 |
20160070190 | TONER HAVING TONER PARTICLES INCLUDING A COLORANT AND PARTICLES NOT INCLUDING A COLORANT - A toner includes first toner particles and second toner particles. Each of the first toner particles includes a plate-like colorant particle covered with binder resin particles, and a volume average size of the plate-like colorant particle is equal to or greater than 6 μm. Each of the second toner particles includes at least one of a binder resin and a releasing agent and not including a colorant, an aspect ratio of the second toner particles is equal to or smaller than 3, and a content ratio of the releasing agents with respect to the second toner particles is equal to or greater than 4 wt % and equal to or smaller than 24 wt %. A content ratio of the second toner particles with respect to the first toner particles is greater than 1 wt % and equal to or smaller than 75 wt %. | 03-10-2016 |
20160077453 | METHOD FOR PRODUCING TONER BY MANAGING ZETA-POTENTIALS OF PARTICLES - A method for producing toner includes adding a liquid containing dispersed resin particles into a liquid containing dispersed colorant particles having a volume average particle size of equal to or greater than 6 μm and having a zeta-potential sign opposite to a zeta-potential sign of the resin particles, until a zeta-potential of aggregates of the colorant particle and the resin particles has a sign opposite to the zeta-potential sign of the colorant particles, adjusting the zeta-potential of the aggregates, such that an absolute value of the zeta-potential of the aggregates is smaller than an absolute value of the zeta-potential of the resin particles by more than 10 mv, and adding a liquid containing dispersed resin particles having a zeta-potential sign that is the same as the sign of the adjusted zeta-potential of the aggregates, into a liquid containing the aggregates. | 03-17-2016 |