摘要:
A toner formed of a toner composition containing a resin and a plasticizer, wherein the following relationships (1) and (2) are satisfied: Tg2r>Tg2t (1), and Tg1t−Tg2t>Tg1r−Tg2r (2), wherein Tg1r represents the peak of the resin for the first temperature rise and Tg2r represents the peak of the resin for the second temperature rise when a differential scanning calorimeter (DSC) measurement is performed for the resin, Tg1t represents the peak of the toner comprising the resin for the first temperature rise and Tg2t represents the peak of the toner comprising the resin for the second temperature rise when a differential scanning calorimeter (DSC) measurement is performed for the toner.
摘要:
Milling approaches provide for the efficient formation of composite particles having an inorganic nanoparticle core with an organic coating composition. The nanoparticles can additionally function as a milling media or distinct milling particles can be used and later separated from the product composite particles. In general, the milling is performed in the presence of a dispersing agent that facilitates dispersing of the composite particles in a carrier liquid. The processes described herein can be effectively used in the formation of composite particles comprising organic pigments. Similarly, the composite particles can be formed with other organic compounds, such as organic pharmaceutical compositions.
摘要:
A toner is provided that contains a binder resin; a colorant; a release agent; and an external additive, wherein the toner has an average circularity of from 0.940 to 0.965 and a crater having a depth of from 0.02 to 0.1 μm, and wherein the crater has an amount of the external additive larger than an average amount thereof on the toner, along with a two-component developer containing the toner and an image forming apparatus using the toner.
摘要:
A toner for developing a latent electrostatic image including a base of toner particle which contains a binder resin and a coloring agent, and an external additive. Herein, a plurality of the base of toner particle has a volume average particle diameter (Dv) of 3 μm to 7 μm, a ratio (Dv/Dn) of the volume average particle diameter (Dv) to a number average particle diameter (Dn) is 1.01 to 1.25, a plurality of the base of toner particle contains 15% by number or less of the base of toner particle having a particle diameter of 0.6 μm to 2.0 μm, a plurality of the base of toner particle has a circularity of 0.930 to 0.990 on average, the binder resin contains a modified polyester resin, and the toner contains 0.3 parts by weight to 5.0 parts by weight of the external additive, relative to 100 parts by weight of the base of toner particle.
摘要:
A toner comprising toner particles comprising a first binder resin; a second binder resin different from said first binder resin and having a glass transition temperature of from 40 to 55 ° C.; a colorant; and a release agent, and a particulate resin material which is located on surface of the toner particles with a coverage of from 50 to 100%, and which has a glass transition temperature of from 50 to 90 ° C., wherein a weight ratio (W2/W1) between the second binder resin (W2) and the first binder resin (W1) is from 5/95 to 40/60, and wherein a ratio (G′80/G′180) between a storage modulus of the toner at 80 ° C. (G′80) and a storage modulus at 180 ° C. (G′180) is from 100 to 1,000.
摘要:
A toner for developing latent electrostatic images is in the form of particles prepared by dissolving or dispersing each component of a composition in an organic solvent to form a solution or dispersion, the composition containing at least a resin reactive with a compound having an active hydrogen group, a compound having an active hydrogen group, a coloring agent, a releasing agent, and a graft polymer C of a polyolefin resin A on which a vinyl resin B has been at least partially grafted; dispersing the solution or dispersion in an aqueous medium; reacting the reactive resin with the compound having an active hydrogen group; removing the organic solvent during or after the step of reacting; and washing and drying particles formed by removing the organic solvent.
摘要:
A toner formed of a toner composition containing a resin and a plasticizer, wherein the following relationships (1) and (2) are satisfied: Tg2r>Tg2t (1), and Tg1t−Tg2t>Tg1r−Tg2r (2), wherein Tg1r represents the peak of the resin for the first temperature rise and Tg2r represents the peak of the resin for the second temperature rise when a differential scanning calorimeter (DSC) measurement is performed for the resin, Tg1t represents the peak of the toner comprising the resin for the first temperature rise and Tg2t represents the peak of the toner comprising the resin for the second temperature rise when a differential scanning calorimeter (DSC) measurement is performed for the toner.
摘要:
A method for developing an electrostatic latent image, including forming a magnet brush of a developer including a toner and a carrier on a developing sleeve including a main magnet and auxiliary magnets; and developing the electrostatic latent image with the magnet brush to form a toner image at a rubbing region, wherein the magnetic flux density in a normal line direction, half width, and attenuation ratio of the main magnet and the angle between the main magnet and auxiliary magnets are specified, and the magnetic sleeve has specific grooves thereon, and wherein the toner has a volume average particle diameter of from 4.0 to 7.0 μm, and includes fine particles having a circle equivalent diameter not greater than 2 μm in an amount not greater than 20% by number.
摘要:
A toner is provided that contains a particulate toner material (mother toner) having an average circularity of from 0.93 to 0.99, and including a modified polyester resin and a colorant; and an external additive in an amount of from 0.3 to 5.0 parts by weight per 100 parts by weight of the mother toner, wherein the toner has a melting viscosity of from 70 to 140 Pa·s at 160° C., a weight-average particle diameter of from 3 to 7 μm, a ratio thereof to a number-average particle diameter of from 1.91 to 1.25, wherein particles satisfy at least one of (I) and (II): (I) particles having a diameter of 4 μm or less in an amount less than 10% by number; or (II) particles having a diameter of 8 μm or more in an amount less than 2% by volume, along with a one or two component developer containing the toner, a cartridge containing the toner, an image forming method using the toner and an image forming apparatus using the toner.
摘要:
A developing device developing a latent image on a latent image carrier with a developer, and including a casing having an opening facing the latent image carrier and a developer carrier. Also included is a magnetic field generating device including a first magnetic pole generating a magnetic field causing the developer to rise on the developer carrier in a form of a magnet brush in a developing region, and a second magnetic pole generating a magnetic field at a downstream side of the first magnetic pole in a rotating direction of the developer carrier. Further, a toner-scattering restraining device is provided on an end portion of the casing at the downstream side of the developing region, and a magnetic member provided on a side of the toner-scattering restraining device facing the latent image carrier. A peak of a magnetic flux density set by the second magnetic pole in its normal direction is located outside of the opening.