Abstract: A toner for developing an electrostatic latent image, including toner particles each containing a black colorant and a binder resin, wherein the black colorant comprises a metal oxide having a number average particle diameter in the range of 20 to 100 nm in an amount of 10 to 40% by weight based on a total weight of the toner particles.

Abstract: Charged toner particles for use in electrostatic imaging, comprising: a toner polymer; and at least one particulate fluorescent material, wherein the toner particles are formed with fibrous extensions.

Abstract: An apparatus for the production of a toner from a starting material having a fluidity includes a head portion and a solidifying portion. The head portion for ejecting the starting material includes a starting material storing portion, which stores the starting material, a piezoelectric material, which generates a pressure pulse for applying the pressure pulse to the starting material and an ejection portion, which ejects the starting material with the pressure pulse. The solidifying portion solidifies the starting material ejected from the head portion into a particulate material.

Abstract: A polyester resin particle dispersion material, in which the average particle size can be easily controlled within a broad range and is less likely to form irregular particles, and which is also suited for use in adhesives, is produced by dispersing a resin melt containing, as an essential component, a polyester resin (A) having a terminal structure in which an alkyl group having 4 to 20 carbon atoms or an alkenyl group having 4 to 20 carbon atoms is bonded to a carbon atom to which a carboxyl group is attached, or a carbon atom adjacent to this carbon atom, a portion or all of carboxyl groups in the polyester resin (A) being neutralized with a basic compound, in a heated aqueous medium in a melted state, and cooling the dispersed resin melt.

Abstract: A toner for electrostatic image development made of a polyester resin having a spherical or generally spherical shape, which allows the use of a so-called oilless fixation system capable of fixing, without employing an anti-offset solution as a heat roller fixation system, and which also provides a developed image having excellent quality. The toner comprises a binder resin and a colorant. The flow beginning temperature Tfb of the toner is 90° C. or higher and 120° C. or lower, the T1/2 temperature exceeds 120° C. and is 160° C. or lower, and the flow ending temperature T end is 130° C. or higher and 170° C. or lower. The toner has a spherical or generally spherical shape having an average roundness of 0.97 or more. The toner can be produced by phase inversion at a low shear within a range of 0.2-5 m/second employing an added alcohol solvent.

Abstract: An image-forming process, which comprises steps of developing an electrostatic latent image on an inorganic photoreceptor with an electrostatic image developer containing 0.1 to 5.0% by weight, based on the toner particles, of silicon carbide fine powder of 0.2 to 1.5 &mgr;m in average primary particle size, 10 to 50 m2/g in specific surface area and 10 to 60% in amount of agglomerated particles, said silicon carbide fine powder being contained in an amount of 0.1 to 5.0% by weight, transferring the developed image to a transfer member, then removing residual toner particles on the photoreceptor by means of a cleaning blade.

Abstract: The method of manufacturing toner for electrophotography includes the steps of dissolving or dispersing a toner composition containing a resin and a coloring agent into polymerizable monomers to provide a solution or a dispersed system, emulsifying the solution or the dispersed system with a first surface active agent in an aqueous medium to provide an emulsion, and polymerizing the polymerizable monomers in the emulsion to obtain toner. A second surface active agent having polarity opposite to polarity of the first surface active agent is added after the emulsifying step.

Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.

Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.

Abstract: A liquid developer for high-quality image reproduction and a method of preparing the liquid developer. The liquid developer exhibits good pigment dispersion by the introduction of organosol. The liquid developer contains fine toner particles of a uniform size with a volume-average to number-average particle diameter ratio of 1.5-2.5, and thus can produce high-resolution images. The liquid developer preparation method is environmentally friendly, simple, and cost effective because no cosolvent is used, thus eliminating the need for a cosolvent removal process.

Abstract: A particulate composition suitable for making color toner includes resin particles optionally containing a charge control agent. The particles are characterized by a micro-serrated surface exhibiting a surface roughness index of at least about 1.2 and preferably higher. A process for making the particulate composition utilizes a vaporizable plasticizer.

Abstract: The present invention provides a toner comprising a binder resin, a colorant, and a releasing agent wherein the releasing agent has an endothermic starting temperature of 40° C. or more and a melting point of 120° C. or less which are measured using a differential scanning calorimeter, the binder resin contains a linear resin and a non-linear resin, the content of the releasing agent existing at the surface of toner particles is 0 to 30% by weight, and the shape factor MLS2 of the toner particles is from 100 to 130. Preferably a mixture of a linear Polyester and a non linear polyester is used as the binder resin. Preferably the weight average molecular weight of the linear polyester is 2.0×103 to 5.0×104. The toner of the present invention has excellent developing characteristics and transfer characteristics, and superior offset resistance even in an oil-less fixing system.

Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.

Abstract: The present invention provides a toner for electrostatic image development made of a polyester resin having a spherical or generally spherical shape, which allows the use of a so-called oilless fixation system capable of fixing, without employing an anti-offset solution as a heat roller fixation system, and which also provides a developed image having excellent quality, and a method of producing the same. The toner for electrostatic image development comprises at least a binder resin and a colorant. The binder resin is made of a polyester resin. The flow beginning temperature Tfb of the toner, as measured by a constant load extrusion type capillary rheometer, is 90° C. or higher and 120° C. or lower, the T½ temperature exceeds 120° C. and is 160° C. or lower, and the flow ending temperature Tend is 130° C. or higher and 170° C. or lower.

Abstract: A process for producing microspheric toner particles suitable for color toner applications includes forming coarse particles of an amorphous polymer with one or more pigments and optionally a charge control agent followed by reducing the particle size such that it is suitable as toner for high resolution electrostatic imaging. A step of comminuting the particles includes forming a dispersion of the particles in a liquid organic medium and applying shear in the presence of a surfactant. In another embodiment, the invention discloses a process for producing microspheric particles of substantially amorphous resin with an average diameter in the range of from about 2 to about 10 microns. Preferred resins include amorphous polyester resins and ethylene/norbornene copolymers.