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Resin microparticle as raw material for toner, aqueous dispersed system thereof and toner

a technology of toner and resin microparticles, applied in the field of resin microparticles as raw materials for toner, aqueous dispersed systems thereof, can solve the problems of deterioration of image quality, high energy requirements in some cases, and easy contamination of toner carriers, etc., and achieve excellent image quality.

Inactive Publication Date: 2007-04-12
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] The resin microparticle according to the present invention has a particle diameter of 50% volume (D50) of 0.05 μm≦D50≦1 μm so that a component such as a dye or a wax is satisfactorily dispersed in the preparation of a toner. Further, the resin microparticle has the relationship of a particle diameter of 10% volume D(10) and a particle diameter of 90% (D90) of D90 / D10≦7 so that a toner obtained from the resin microparticle does not contaminate a carrier, thus resulting in obtaining excellent image quality. Further, the resin microparticle has the content of an organic solvent of not more than 70 ppm so that a toner obtained from the resin microparticle produces low order. Thus, the toner is preferable from the viewpoint of working environment as well. Therefore, the resin microparticle of the present invention can be suitably used for a toner raw material.

Problems solved by technology

Therefore, it is pointed out that the deterioration of image quality and a carrier pollution by the toner easily occur.
Furthermore, for producing a toner having a small particle diameter and a narrow particle size distribution by the kneading and grinding method, much energy may be required in some cases.
Since that method employs an organic solvent, a process for removing such a solvent is troublesome and there is also a problem of economical efficiency.
Further, it is difficult to completely remove an organic solvent from the aqueous dispersed system.
Therefore, there are problems of environmental contamination, safety, odor and the like caused by the organic solvent.
In that method, since a particle diameter of the microparticle before fusion is big, there has been a problem that it is not possible to obtain a resin microparticle having physical properties that the present inventors have targeted.

Method used

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  • Resin microparticle as raw material for toner, aqueous dispersed system thereof and toner

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0236] 91 mass parts of the resin (A-2-1), 5 mass parts of a carbon black REGAL330R (a product of Cabot Specialty Chemicals, Inc.), 3 mass parts of refined carnauba wax 1 powder (a product of Nippon Wax Co., Ltd.) and 1 mass part of a charge controlling agent BONTRON S-34 (a product of Orient Chemical Industries, Ltd.) were dispersed and mixed using a Henschel mixer. The resulting material was fed into a twin screw extruder PCM30-41.5 (a product of Ikegai Corporation) at 3.6 kg / hr and melt-kneaded at 140° C., and distilled water was continuously fed from a feeding port placed at a vent section of the extruder at 960 g / hr to obtain an aqueous dispersed system comprising a microparticle dispersed in water. An average particle diameter of 50% volume (D50) of the obtained microparticle was 0.29 μm.

[0237] The solid content ratio of the aqueous dispersed system was adjusted to be 20 mass %. 300 g of the aqueous dispersed system and 400 g of 2 weight % sodium chloride aqueous solution wer...

example 2

[0238] A toner was obtained in the same manner as in Example 1, except that the resin (A-2-2) was used as a raw material and the concentration of the sodium chloride aqueous solution was changed to 1.5 mass %. The evaluation results are shown in Table 9.

example 3

[0239] A toner was obtained in the same manner as in Example 1, except that 64 mass parts of the resin (A-2-3) was used as a raw material and 27 mass parts of WR-901 (a product of Nippon Synthetic Chemical Industry Co., Ltd.) was used as a emulsifying auxiliary. The evaluation results are shown in Table 9.

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Abstract

A resin microparticle for a toner raw material that has a small particle diameter and a narrow particle diameter distribution and has a low odor is provided. The resin microparticle for a toner raw material has the following requirements (i) to (iii) satisfied: Requirement (i): A particle diameter of 50% volume (D50) satisfies the relationship 0.05 μm≦D50≦1 μm; Requirement (ii): A particle diameter of 10% volume (D10) and a particle diameter of 90% volume (D90) satisfy the relationship D90 / D10≦7; and Requirement (iii): The content of an organic solvent is not more than 70 ppm.

Description

TECHNICAL FIELD [0001] The present invention relates to a resin microparticle for a toner raw material which has a uniform particle shape and form, an aqueous dispersed system having a microparticle in a disperse phase, and a toner comprising the microparticle. BACKGROUND ART [0002] As production method of a toner for electrostatic development, a kneading and grinding method has been widely used. A toner for electrostatic development obtained by that method tends to has a wide particle size distribution and has a lot of coarse powders and fine powders. Therefore, it is pointed out that the deterioration of image quality and a carrier pollution by the toner easily occur. Furthermore, for producing a toner having a small particle diameter and a narrow particle size distribution by the kneading and grinding method, much energy may be required in some cases. [0003] As a method for producing an aqueous dispersed system of a resin microparticle, a method using a twin screw extruder has be...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/0812G03G9/0819G03G9/0821G03G9/08704G03G9/08711G03G9/08755G03G9/08759G03G9/08786G03G9/08788G03G9/08793G03G9/08795G03G9/08797G03G9/087
Inventor MATSUOKA, HIROSHISASAKI, ICHIROUNARUTAKI, TOSHIMITSUWAKIZAKA, MASARUTAKEI, HIROYUKI
Owner MITSUI CHEM INC
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