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Toner for electrostatic image development and process for preparing the same

A technology for electrostatic image development and manufacturing methods, applied in the direction of developer, electric recording process using charge pattern, electric recording process using charge pattern, etc., can solve the problems of toner containing monomer and difficult to control particle size, etc. Achieves effects of improved storage performance and fixability, improved toner performance, excellent toner performance

Inactive Publication Date: 2006-10-18
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a vinyl type resin dispersion is used as described above, the toner contains a monomer
In addition, particle size control is very difficult due to soft aggregation caused by the use of surfactants

Method used

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  • Toner for electrostatic image development and process for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] (mixture preparation steps)

[0151] The above-mentioned pigment aqueous dispersion 2, the above-mentioned polyester resin water microdispersion 1 (90 parts by weight shown in Table 2) are respectively expressed in the ratio of solid substance concentration (weight parts) shown in Table 2. 85%) and the aqueous dispersion of wax particles were mixed to obtain a mixture. At this point, the total solids concentration was adjusted to 10% with water.

[0152] (condensate formation step)

[0153] While the resulting mixture was stirred at 1500 rpm by a Max Blend stirring device, 270 parts by weight of a 1% by weight aqueous magnesium chloride solution was added dropwise as a coagulant, and then the mixture was stirred for 1 hour. Thereby, toner aggregates are formed in the aqueous medium. Then the remaining polyester resin aqueous microdispersion 1 (the remaining 15% of the 90 parts by weight shown in Table 2) was added, and 30 parts by weight of a 1% by weight aqueous sol...

Embodiment 2

[0160] Except that the ratio represented by the solid matter concentration (weight part) shown in Table 2 is made of the mixture by the pigment water dispersion 1 and the polyester resin water microdispersion 2 containing the dispersion type pigment cyan, with the same as embodiment 1 The toner was produced in the same manner as in Example 2 to obtain the cyan toner.

Embodiment 3

[0162] In addition to making the mixture by the pigment aqueous dispersion 3 and the polyester resin aqueous microdispersion 3 containing the dispersed pigment yellow in the ratio represented by the solid matter concentration (weight parts) shown in Table 2, the same as in Example 1 The toner was produced in the same manner, and the yellow toner of Example 3 was obtained.

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Abstract

A process for preparing a toner for electrostatic image development, the process comprising the steps of: (S1) mixing an aqueous pigment dispersion and an aqueous resin particle dispersion containing self-dispersible polyester resin particles as a binder resin to prepare a mixture; and (S2) adding a polyvalent metal salt as a flocculant to the mixture while stirring to form aggregates of the pigment bonded to the resin particles, wherein the self-dispersible polyester resin is prepared by reacting a carboxylic acid compound with an alcohol compound inclusive of a polyhydric alcohol, the carboxylic acid compound being one or more of a polycarboxylic acid having three or more carboxyl groups and its anhydride.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic image used in an electrophotographic image forming apparatus and a method for producing the same. Furthermore, the present invention relates to an electrostatic image developer, an image forming method using the developer, and a formed image. Background technique [0002] With recent remarkable progress in office automation equipment, copiers, printers, and facsimile equipment that implement printing using an electrophotographic method have become popular. An electrophotographic image forming apparatus generally performs image formation through the steps of charging, exposing, developing, transferring, cleaning, and fixing. [0003] In the charging step, the surface of the photoreceptor is uniformly charged in a dark place. In the exposing step, an original image is projected onto a charged photoreceptor, thereby forming an electrostatic latent image on the surface of the photor...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G13/04G03G13/08G03G13/16
Inventor 加本贵则
Owner SHARP KK
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