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Toner, method for its production and image forming method

A technology of toners and toner materials, applied in the field of toners, can solve the problems of narrow particle size distribution of toners, failure to provide such, easy to generate fog, etc., and achieve excellent charge stability, high image density, high definition effect

Inactive Publication Date: 2006-07-05
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this method, there is a problem that since a dissolved and dispersed solution of the toner composition is emulsified in an aqueous medium containing organic fine particles to form oil droplets, coalescence between oil droplets progresses with emulsification, so there is the following problem : Toner having a substantially average particle diameter and a toner material composition that is not uniform among toner particles have poor charge stability, easily generate fog, and cause toner scattering (scattering), although toner Relatively narrow particle size distribution of toner
[0010] Therefore, there is a great need for a toner production method in which toners are constantly and efficiently produced under stable conditions, the toner particles have uniform and homogeneous composition components, are excellent in charge stability, and can form High-quality images without substantially causing fogging and toner scattering while maintaining the advantages of chemical toners with small particle sizes and narrow particle size distributions and excellent fluidity; however, no such method has been provided so far

Method used

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  • Toner, method for its production and image forming method
  • Toner, method for its production and image forming method
  • Toner, method for its production and image forming method

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0457] -Preparation of aqueous dispersion of wax (wax dispersion)(1)-

[0458] In a container, pour 200 parts by mass of paraffin (melting point 78°C), 10 parts by mass of anionic surfactant (NeoGen SC) and 790 parts by mass of water, heat at 95°C, and use a Gaulin Homogenizer at an output pressure of 560×10 5 N / m 2 It was emulsified and then quenched, thereby preparing an aqueous wax dispersion (wax dispersion) (1).

[0459] The volume average particle diameter (Dv) of the wax dispersion liquid particles in the obtained wax dispersion liquid (1) was measured using a particle size distribution analyzer (LA-920, manufactured by HORIBA Ltd.), and the volume average particle diameter of the wax dispersion liquid particles was measured by the laser light scattering method. The diameter (Dv) is 0.160 microns. In the wax dispersion particles, coarse particles having a volume average particle diameter (Dv) of 0.8 µm or more are present in a ratio of 5% or less.

preparation Embodiment 2

[0461] -Preparation of aqueous dispersion of wax (wax dispersion)(2)-

[0462] In a container, pour 200 parts by mass of paraffin (melting point 68°C), 10 parts by mass of anionic surfactant (NeoGen SC), and 790 parts by mass of water, heat at 95°C, and use a Gaulin Homogenizer at an output pressure of 560×10 5 N / m 2 It was emulsified and then quenched, thereby preparing an aqueous wax dispersion (wax dispersion) (2).

[0463] The volume average particle diameter (Dv) of the wax dispersion liquid particles in the obtained wax dispersion liquid (2) was measured using a particle size distribution analyzer (LA-920, manufactured by HORIBA Ltd.), and the volume average particle diameter (Dv) of the wax dispersion liquid particles was measured by the laser light scattering method. The diameter (Dv) is 0.130 microns. In the wax dispersion liquid particles, the proportion of coarse particles having a volume average particle diameter (Dv) of 0.8 µm or more was 3% or less.

preparation Embodiment 3

[0465] -Preparation of aqueous dispersion of wax (wax dispersion)(3)-

[0466] In a container, pour 200 parts by mass of carbonyl-containing wax (melting point 82°C), 10 parts by mass of anionic surfactant (NeoGen SC), and 790 parts by mass of water, heat at 130°C, and use a GaulinHomogenizer at an output pressure of 560×10 5 N / m 2 Under emulsification, followed by quenching, an aqueous dispersion of wax (wax dispersion) (3) was prepared.

[0467] The volume average particle diameter (Dv) of the wax dispersion liquid particles in the obtained wax dispersion liquid (3) was measured using a particle size distribution analyzer (LA-920, manufactured by HORIBA Ltd.), and the volume average particle diameter (Dv) of the wax dispersion liquid particles was measured by the laser light scattering method. The diameter (Dv) is 0.182 microns. In the wax dispersion particles, coarse particles having a volume average particle diameter (Dv) of 0.8 µm or more are present in a ratio of 5% or...

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Abstract

The object of the present invention is to provide a toner having a uniform composition of toner materials among toner particles, excelling in charge stability, enabling high-quality images without substantially causing fog and toner scattering, and having a small diameter and a narrow particle size distribution. The present invention also provides an effective production method of the toner, and an image forming method and the like using the toner. For this end, the present invention provides a method for producing a toner in which a dissolved and dispersed solution of toner materials is dispersed as dispersion particles in an aqueous medium containing no organic resin fine particles to prepare an oil droplet-in-water dispersion, and organic resin fine particles are added to the oil droplet-in-water dispersion to thereby granulate a toner in the presence of the organic resin fine particles.

Description

technical field [0001] The present invention relates to toners suitable for electrophotography, electrostatic recording, electrostatic printing, and the like. The present invention also relates to a method for efficiently producing the toner. The present invention also relates to a developer, a toner container, a process cartridge, an image forming apparatus, and an image forming method, all of which are capable of obtaining high-quality images by using the toner. Background technique [0002] When forming an image based on electrophotography, the image is generally formed through a series of processes including forming an electrostatic image on a photoconductor (electrostatic image bearing member), developing the electrostatic image using a developer to form a visible image (toner image), The visible image is transferred onto a recording medium such as paper, and the visible image is fixed on the recording medium to thereby form a fixed image. (See US Patent 2297691). ...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/13G03G13/00
CPCG03G9/08755G03G9/08793G03G9/0815G03G9/08795G03G9/08791G03G9/0806G03G9/08782G03G9/08797
Inventor 井上竜太江本茂渡辺阳一郎渡边真弘山田雅英齐藤彰法大木正启杉山恒心
Owner RICOH KK
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