57results about How to "Sharp particle size distribution" patented technology

The object of the present invention is to provide a developer having a sharp charge amount distribution and bringing out high-quality image without substantially smearing a charging unit, developing units, a photoconductor, and an intermediate transferring member by the developer, namely, a developer capable of providing an appropriate image density and exhibiting extremely little background smear even when used over a long period of time and repeatedly used for a number of sheets of paper as well as to provide an image forming apparatus for electrophotography using the developer.

To provide a method for producing a toner in which at least monomers are polymerized in at least one of a supercritical fluid and a subcritical fluid to thereby produce toner particles, wherein at least one of the supercritical fluid and the subcritical fluid contains a fluorine-containing surfactant, and a polymer resulted from polymerization of the monomers is insoluble in at least one of the supercritical fluid and the subcritical fluid, and provide a toner produced by the method for producing the toner.

Provided are an organic nano-particle which has nano-size and its particle distribution is sharp; and an organic nano-particle dispersion composition having stable and excellent dispersion property, flow behavior. Besides, provided are a color filter made of them, which has high contrast and perform excellent display property; a liquid crystal device and a CCD device by using them; and a colored photosensitive resin composition and a photosensitive resin transcription material by using them. An organic nano-particle which is consisting of organic material, its amount average particle size is 50 nm or less, and the ratio of (volume average particle size)/(amount average particle size) is 1.0~2.0.

A powdery linear polymer having a narrow particle size distribution with little dusting and excellent in anti-blocking property is recovered from a latex of a linear polymer containing a large proportion (35-75 wt. %) of soft polymer (S) component through a two-step coagulation process including a first (moderate coagulation) step causing 70-98 wt. % of the coagulation. The linear polymer in the latex has a multilayer structure comprising a linear polymer (S) having a glass transition temperature below 40° C. and a linear polymer (H) having a higher glass transition temperature disposed in totally at least two layers and containing 35-75 wt. %, as a whole, of the linear polymer (S) with the proviso that the linear polymer (S) cannot be contained in excess of 30 wt. % in an outermost layer of the multilayer structure.

[Problem] By obtaining a compound hydroxide that has a sharp particle diameter distribution, the present invention aims to improve the cycle properties of a nonaqueous electrolyte secondary cell obtained using the nickel-cobalt compound hydroxide as the precursor. [Solution] In the present invention, a slurry contains a nickel-cobalt compound hydroxide that is obtained by reacting and continuously feeding to a reactor an aqueous solution containing at least nickel and cobalt, an aqueous solution that serves as an ammonium ion donor, and an aqueous caustic alkali solution. The slurry is continuously extracted and the slurry is separated by grading into large particle diameter portions and small particle diameter portions. The small particle diameter portion is continuously circulated back to the reactor. The resulting nickel-cobalt compound hydroxide is represented by the general formula Ni1-x-yCoxMy (OH)2 (where 0.05 ≤ x ≤ 0.50, 0 ≤ y ≤ 0.10, 0.05 ≤ x + y ≤ 0.50, M is at least one metal element selected from Al, Mg, Mn, Ti, Fe, Cu, Zn, and Ga), wherein the correlations of (D50-D10)/D50 ≤ 0.30 and (D90-D50)/D50 ≤ 0.30 are established between D10, D50, and D90.

The present invention provides new process for preparing inorganic fine particles, which suppresses agglomeration and adhesion of particles due to heat when preparing powder from a raw material liquid such as a slurry of zirconia hydrate fine particles in order to obtain inorganic raw material powder having sharp particle size distribution. Furthermore, the present invention provides a new process for preparing inorganic fine particles, which can make the chemical structure homogenous among the produced particles and inside the particles even in a multi-component system. The present invention provides a process for preparing inorganic fine particles, which comprises heating and applying impulse waves to a raw material liquid.

A toner includes aggregated particles produced by preparing in an aqueous medium a mixed dispersion including at least a first resin particle dispersion in which first resin particles are dispersed, a colorant particle dispersion in which colorant particles are dispersed, and a wax particle dispersion in which wax particles are dispersed, heating the mixed dispersion so that at least part of the wax particles is melted, and aggregating the first resin particles, the colorant particles, and the wax particles at least part of which is melted by the addition of an aqueous solution containing an aggregating agent. Thus, the toner can have a smaller particle size and a sharp particle size distribution without requiring a classification process. Moreover, the toner can achieve a longer life and suppress transfer voids or scattering during transfer.

A coloring composition for a color filter composed of composite particles having an average particle diameter of 0.00 1 to 1.0 μm, and containing white inorganic particles, a glue coating layer formed on the surface of the white inorganic particle and an organic pigment coat formed on the glue. A dispersant, binder resin, monomer as a reactive diluent, a polymerization initiator and a solvent are also present. The colorant provides not only a sharp particle size distribution but also excellent light resistance.

The aim of the invention is to reduce inferior insulation of laminated ceramic capacitor and improve failure lifetime characteristic in load test. The barium titanate powder which is used for obtaining dielectric ceramic of a dielectric layer 2 in the laminated ceramic capacitor 1 has sharp particle size distribution and satisfies the following states: the average particle diameter D1 is 10-200nm; 1.0<D2/D1</=2.0 and 0.5</=D3/D1<1.0 when a maximum particle diameter is set to D2 and a minimal particle diameter is set to D3. Therefore, the barium titanate powder has the following advantages: greatly improving the dispersivity in ceramic slurry, realizing density increase and surface smoothing of the dielectric ceramic layer 2 in the laminated ceramic capacitor 1, reducing inferior insulation and improving failure lifetime characteristic of load test.

There are provided a copper powder for conductive paste, which comprises monodisperse and spherical fine copper particles having a sharp particle size distribution and containing no coarse particles and which can form a thinner electrode film while avoiding a bad influence on electric characteristics thereof, and a method for stably producing such a copper powder for conductive paste. After copper is complexed by adding a complexing agent to an aqueous solution containing copper while blowing air into the solution, the blowing of air is stopped, and then, a reducing agent is added to the solution to deposit copper particles by reduction.

Provided is a toner, comprising a toner particle having a core-shell structure composed of a core particle and a shell phase on a surface of the core particle, the core particle containing a resin X and a colorant, the shell phase being derived from a resin fine particle containing a resin Y, in which a relationship among a SP value of the resin X, a SP value of the resin Y, and a SP value of an organic solvent falls within a specific range, and a relationship between a number-average particle diameter of the resin fine particle when the resin fine particle is dispersed in water and a number-average particle diameter of the resin fine particle when the resin fine particle is dispersed in the organic solvent falls within a specific range.

A process for the production of uni-core detergent particles which can dispense with the drying step for dehydration after granulation and which makes it possible to produce in high yield uni-core detergent particles containing an anionic surfactant which are little irritant to the skin and exhibit good biodegradability, reduced particle growth, and a sharp particle size distribution.