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Method for manufacturing toner, toner and image forming method

A manufacturing method and technology of toner, applied in the direction of electric recording process using charge pattern, equipment and developer of electric recording process using charge pattern, etc., capable of solving the problems of particle collapse, insufficient mechanical strength, waste of carrier, etc. , to achieve the effect of suppressing the amount of toner adhesion

Active Publication Date: 2014-07-16
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, voids formed by solvent volatilization are not only spherical but also have crack shapes
When the particle has a large void fraction, the particle collapses due to insufficient mechanical strength, which causes problems such as carrier spent

Method used

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  • Method for manufacturing toner, toner and image forming method
  • Method for manufacturing toner, toner and image forming method
  • Method for manufacturing toner, toner and image forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0217] Hereinafter, the present invention will be further described in detail with reference to examples, but the examples should not be construed as limiting the scope of the present invention. Note that the unit "part" in the examples means "part by mass".

[0218] [Preparation of the first liquid]

manufacture example 1

[0219] Production Example 1: First Liquid (a1)

[0220] In a tank were placed 170 parts of a 35% by mass dispersion of carnauba wax in ethyl acetate, 120 parts of styrene-methyl acrylate copolymer, 20 parts of yellow pigment PY155 (manufactured by Clariant (Japan) K.K.), 70 parts Ethyl acetate and 2 parts of isophoronediamine and mixed with stirring for 2 hours. It was then circulated and mixed for 1 hour using a high-efficiency dispersing device EBARA MILDER (manufactured by Ebara Corporation) to obtain a first solution (a1). The styrene-methyl acrylate copolymer as the binder resin had an acid value of 15 KOHmg / g.

manufacture example 2

[0221] Production Example 2: First Solution (a2)

[0222] The first solution (a2) of Production Example 2 was obtained in the same manner as the first solution (a1), except that a polyester resin was used instead of the styrene-methyl acrylate copolymer in Production Example 1. This polyester resin as a binder resin had an acid value of 15 KOHmg / g.

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Abstract

A method for manufacturing a toner, including at least: dissolving or dispersing a toner material including at least any one of a binder resin and a precursor of a binder resin in an organic solvent which is dispersed in a dispersant-including aqueous medium; forming particles by removing the organic solvent; washing the particles; forming voids in the particles by heating to a temperature T while or after dispersing the particles in an aqueous medium; forming toner base particles by adding a charge controlling agent; and adding an external additive to the toner base particles to obtain toner particles, wherein the T is between a glass transition temperature Tg of the toner particles and Tg + 25 DEG C, and the toner has a cross-sectional void fraction Sp / St of 0.1% to 15.0%, where St is a cross-sectional area of the toner particles, and Sp is a cross-sectional area of the voids.

Description

technical field [0001] The present invention relates to a toner for developing electrostatic latent images in electrophotography, electrostatic recording, and electrostatic printing, a method for producing the toner, and an image forming method using the toner. Background technique [0002] In electrophotographic devices and electrostatic recording devices, toner is caused to adhere to an electrostatic latent image formed on a photoreceptor, which is transferred to a recording medium and fixed on the recording medium by heat, and a toner image is formed . [0003] Also, generally, a full-color image is formed by reproducing colors using toners of four colors (ie, yellow, magenta, cyan, and black). A toner image in which each toner is superimposed on a recording medium is heated and fixed, and a full-color image is formed. [0004] In general, a toner for developing an electrostatic image includes colored particles containing a colorant, a charge control agent, and other ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/0804G03G9/0821G03G9/0825G03G9/087G03G9/08755G03G9/08795G03G9/08797G03G2215/0626G03G2215/16G03G2215/20
Inventor 多田圭佑上原贤一三泽太辅及川步美远藤寿
Owner RICOH KK
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