Abstract: An external additives for electrophtographic toner comprising finely divided oxide particulate including a silicon compound and a compound for doping said oxide particulate, wherein particle diameter of the primary particle of said finely divided oxide particulate is in the range of 30 nm to 150 nm, and the primary particle of said finely divided oxide particles is substantially spherical shape having the roundness in the range of 0.95 to 0.996, is provided. And this external additives is capable of evading from the embedding of external additives into toner even if after the toner is held in the storage under the condition of high temperature and high humidity, thereby the additives is capable of showing sufficient functions as fluidizing agent and charge supplement agent, and is capable of inhibiting an abnormal charge elevation even after being stored under the low temperature and low humidity.

Abstract: A toner for electrophotography contains a binder resin and a colorant, the toner for electrophotography has a tensile fracture strength of 10-1400 (N/m2) under 10 kg/cm2 compression, and a loose apparent density of 0.10-0.50 (g/cm3).

Abstract: A two-component developer includes at least a magnetic toner and a magnetic carrier. The magnetic toner has magnetic particles coated with a carbon black layer. The magnetic toner adheres to the magnetic carrier due to the magnetic interaction.

Abstract: A toner including at least a binder resin; a colorant; a charge controlling agent; and a wax (B), in which the charge controlling agent comprises a compound selected from the group consisting of: an aromatic oxycarboxylic acids, derivatives of aromatic oxycarboxylic acid, salts of aromatic oxycarboxylic acids and salts of derivatives of aromatic oxycarboxylic acids; and a zirconium compound (A), and in which the zirconium compound (A) and the wax (B) have a weight ratio (A/B) satisfying the following relationship:

Abstract: A two component developer comprising a magnetic toner containing a binder resin and a magnetic particle, and a magnetic carrier containing a magnetic particle, wherein the magnetic toner has an average particle diameter of 4.0 to 10.0 &mgr;m, and contains 5 to 80 No. % of toner particles having particle diameter of 5 &mgr;m or less, and exhibits magnetization of 10 to 25 emu/g under magnetic field of 5 kiloersteds.

Abstract: A two-component developer comprises a toner which contains at least a resin and a colorant and to which an external additive is added, and a carrier. The toner has a number average molecular weight (Mn) not greater than 3,000 and contains particles having a molecular weight not greater than 1,000 in an amount not less than 40 number %. The carrier satisfies the relation 3,000,000≦&sgr;1000×Dc3≦20,000,00  (1) where &sgr;1000 represents a magnetization (emu/g) of the carrier at 1,000 oersted, and Dc represents a volume average particle diameter (&mgr;m) of the carrier.

Abstract: A two-step process for the production of a toner for developing electrostatic images, including a first pulverizing step wherein a toner composition containing a binder and a coloring agent is pulverized to obtain preliminarily pulverized particles having a weight average particle diameter of 20-100 &mgr;m and containing no more than 50% by weight of particles having roundness of 0.90 or less, and a second pulverizing step wherein the preliminarily pulverized particles are finely pulverized to obtain finely pulverized particles having a weight average particle diameter of 5-13 &mgr;m and containing no more than 30% by weight of particles having roundness of 0.90 or less and no more than 15%, based on the total number of particles of the finely pulverized particles, of particles having a particle diameter of 5 &mgr;m or less.

Abstract: An image forming apparatus including a photoconductor, and a developing unit having a developing sleeve for carrying a developer and a developer regulating plate for regulating the amount of the developer carried on the sleeve, wherein the developer is composed of a carrier and a toner, wherein that portion of the toner which has a particle diameter of 2.0-4.0 &mgr;m accounts for 30-70% of a total number thereof, and wherein the developer regulating plate is grounded so that when the developing sleeve is applied with a bias voltage, an electric field is formed between the developer regulating plate and the developing sleeve, whereby toner deposits on the developing sleeve are transferred to the developer regulating plate.

Abstract: An image forming method and apparatus, wherein a surface of a photoconductor is charged with a contact-type charging roller having a surface roughness of 2-40 &mgr;m, and exposed imagewise to form an electrostatic latent image thereon, the latent image being developed with a toner, transferred to a transfer member and fixed, and wherein the toner comprises a colorant, and a binder resin containing a tetrahydrofuran-soluble component having such a molecular weight distribution that at least one peak having a half width not greater than 15,000 is present between 1,000 and 10,000 when measured by gel permeation chromatography.

Abstract: A two-component developer consists of a toner, which contains at least a resin and a colorant and to which an external additive is added, and a carrier. This two-component developer has the toner that has a number average molecular weight (Mn) of 3,000 or less and contains particles having a molecular weight of 1,000 or less at 40 number % or more, and also has the carrier that satisfies general formula (1) as follows: 3,000,000≦&sgr;1000×Dc3≦20,000,000  (1) where &sgr;1000 represents a magnetization (emu/g) of a carrier at 1,000 oersted, and Dc represents volume average particle diameter (&mgr;m) of the carrier.

Abstract: An image forming toner is provided, including at least:

Abstract: A two-component developer including at least a magnetic toner and a magnetic carrier having magnetic particles coated with carbon black. The magnetic toner adheres to the magnetic carrier due to the magnetic interaction.

Abstract: A toner including toner particles including a binder resin and a release agent, wherein when the toner is molded into a plate upon application of a pressure of 478 kg/cm2, the toner plate has a surface having a coefficient of static friction of from 0.20 to 0.40. An image forming apparatus including an image bearing member, an image developer to form a toner image on the image bearing member, an image transferer configured to transfer the toner image on a receiving material and a fixer configured to fix the toner image thereon, wherein the apparatus has a waiting time not longer than 15 seconds, and a maximum power consumption not greater than 1.5 KW and 30 W in an image forming state and in a standby state, respectively, wherein the toner is the toner mentioned above.

Abstract: A method of producing a toner for developing latent electrostatic images includes the steps of preliminarily grinding a toner composition having at least a binder resin and a coloring agent to prepare a preliminarily ground product, and finely pulverizing the preliminarily ground product using a pulverizer to produce toner particles, wherein the preliminarily ground product satisfies conditions (1) and (2): Dv≧D10  (1) D50<3D10  (2) wherein Dv is a weight mean diameter of the preliminarily ground product, D10 is a weight mean diameter when the cumulative number of particles reaches 10% at measurement of a cumulative particle distribution, and D50 is a weight mean diameter when the cumulative number of particles reaches 50% at measurement of the cumulative particle distribution.

Abstract: An image formation method includes the steps of charging the surface of an electrophotographic photoconductor, exposing the charged photoconductor to a light image to form a latent electrostatic image on the photoconductor, developing the latent electrostatic image using a two-component developer containing a toner and a carrier to obtain a toner image, and transferring the toner image to an image receiving material directly or via an intermediate transfer member, with the photoconductor showing a surface friction coefficient of 0.40 or less, and the toner having toner particles with an average circularity of 0.930 or more.

Abstract: A method for fixing full-color toner images on an image receiving member so that the fixed toner images selectively exhibit different glossinesses includes the step of bringing the transferred toner images into contact with a heater, with linear speeds being selectively switched in such a manner that the fixed toner images exhibit a mean surface roughness in a range of 9.5 to 16 &mgr;m at a linear speed (A), and the fixed toner images exhibit a mean surface roughness of less than 8 &mgr;m at a linear speed (B), wherein the linear speed (A) is in a range of 100 to 300 mm/sec, the linear speed (B) is lower than the linear speed (A) by 25 mm/sec or more, and the image fixing temperatures are equal at the linear speeds (A) and (B). A method for fixing full-color toner images with high glossiness on an image receiving member includes the step of bringing the transferred toner images into contact with a belt so that the fixed toner images exhibit a mean surface roughness of less than 8 &mgr;m.

Abstract: A two-component developer consists of a toner, which contains at least a resin and a colorant and to which an external additive is added, and a carrier.

Abstract: An electrophotographic toner comprising a binder resin, colorant, and an external additive, wherein the binder resin is soluble in tetrahydrofuran and includes at least a first resin component and a second resin component, wherein the first resin component has a molecular weight distribution such that a peak is present in a molecular weight range of from 1,000 to 10,000, and the second resin component has a molecular weight distribution such that a peak is present in a molecular weight range of from 100,000 to 10,000,000, wherein the peak of the first resin component is the largest, and the second resin component is present in the binder resin in an amount of from 10 to 30% by weight, and wherein the second resin component has a dynamic modulus G′ of from 100,000 to 50,000,000 dyne/cm2 when the dynamic modulus is measured by a frequency sweep method under conditions of 150° C. in temperature and 0.01 to 100 rad/sec in frequency.

Abstract: A method of producing a toner for developing latent electrostatic images includes the steps of preliminarily grinding a toner composition having at least a binder resin and a coloring agent to prepare a preliminarily ground product, and finely pulverizing the preliminarily ground product using a pulverizer to produce toner particles, wherein the preliminarily ground product satisfies conditions (1) and (2):

Abstract: A two-component developer includes a magnetic carrier including magnetic carrier particles with an average particle diameter of 35 &mgr;m to 100 &mgr;m, and a toner including toner particles with a weight-average particle diameter of 6.0 &mgr;m to 11.5 &mgr;m, to which at least one additive is externally added thereto in an amount of 0.3 to 1.5 wt. % to the toner, the toner particles including (a) toner particles with a particle diameter of 5 &mgr;m or less with a content ratio of 15% or less by number, and (b) toner particles with such a particle diameter that is two times or greater than the weight-average particle diameter of the toner particles with a content ratio of 5% or less by volume, the toner particles satisfying a relationship of 0.60≦D25/D75≦0.85 as defined in the specification. A container in which the two-component developer is contained, and an electrophotographic image formation apparatus in which the container is incorporated are proposed.