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Toner for electrostatic charge image development

A technology for electrostatic charge images and toners, which can be used in developers, electrographics, optics, etc., to solve the problem that the balance between low-temperature fixability and heat-offset resistance may not be good, and achieve good durability and preservation. , the effect of good heat resistance

Inactive Publication Date: 2007-02-28
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when the toners disclosed in Patent Document 2 and Patent Document 3 are used in high-speed image forming apparatuses of 24 sheets / minute or more whose demand has increased in recent years, the balance between low-temperature fixability and hot offset resistance is not necessarily balanced. good

Method used

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  • Toner for electrostatic charge image development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] 100 parts of a monomer composition consisting of 80.5 parts of styrene and 19.5 parts of n-butyl acrylate, 0.5 parts of polyisoprene-based diacrylate (average molecular weight : 3000, produced by Osaka Organic Chemical Industry Co., Ltd., trade name "BAC-45"), 6 parts of carbon black (manufactured by Mitsubishi Chemical Corporation, trade name "#25"), 1 part of anti-negative resin (product with 2% sulfonic acid functional group) , Fujikura Chemical Co., Ltd., trade name "FCA S748"), 2 parts of tert-dodecyl mercaptan and 0.5 part of polymethacrylate macromonomer (manufactured by Toa Gosei Chemicals, trade name "AA6", Tg =94°C), uniformly disperse by MEDIA type disperser. Next, 10 parts of dipentaerythritol hexamyristate (acid value: 0.5 mgKOH / g, hydroxyl value: 1.2 mgKOH / g) were added, mixed and dissolved to obtain a polymerizable monomer composition (mixed solution). In addition, the preparation of the polymerizable monomer composition was all performed at room tempera...

Embodiment 2

[0133] Except for using a composition consisting of 90 parts of styrene and 10 parts of n-butyl acrylate as the monomer composition, the amount of polyisoprene-based diacrylate was set to 1.5 parts, the amount of t-dodecyl mercaptan was Except that the amount was set to 1 part, it carried out similarly to Example 1, and obtained the toner for electrostatic charge image development. Evaluation of the properties, image, etc. of the obtained toner for developing electrostatic images was carried out in the same manner as in Example 1. The results are shown in Table 1.

Embodiment 3

[0135] In addition to using a composition consisting of 90 parts of styrene and 10 parts of n-butyl acrylate as the monomer composition, 2 parts of bisphenol A propylene oxide adduct diacrylate (manufactured by Kyoei Chemical Industry Co., Ltd., trade name "Laitoacrilato BP-4PA") was used in the same manner as in Example 1, except that the polyisoprene-based diacrylate was replaced with 0.6 part of t-dodecyl mercaptan, to obtain an electrostatic charge image developing device. toner. Evaluation of the properties, image, etc. of the obtained toner for developing electrostatic images was carried out in the same manner as in Example 1. The results are shown in Table 1.

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Abstract

To provide a toner for electrostatic charge image development that even in high-speed printing, enables low-temperature fixation, having excellent anti-hot-offset property and that excels in durability and storability. [MEANS FOR SOLVING PROBLEMS] There is provided a toner for electrostatic charge image development comprising colored resin particles comprising a binder resin, a colorant, a charging control agent and a release agent, characterized in that (1) the colored resin particles have a volume average particle diameter (Dv) of 4 to 9 mum, (2) the colored resin particles have an average circularity of 0.93 to 0.995, (3) the shear viscosity (eta1) thereof at 130 DEG C and at a shear rate of 10 / s is in the range of 800 to 3500 Pa s, and (4) the shear viscosity (eta2) thereof at 130 DEG C and at a shear rate of 500 / s is in the range of 100 to 1000 Pa s.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image, and more particularly, to a toner for developing an electrostatic charge image which can be fixed at a low temperature even during high-speed printing, has good thermal offset resistance, and is excellent in durability and storage stability at the same time. toner. Background technique [0002] Conventionally, many methods have been known as image forming methods using the electrophotographic method. Generally speaking, a photoconductive material is used to charge the surface of a photoreceptor by various methods with a charging member, an electrostatic latent image is formed on the charged surface of the photoreceptor by a light irradiation device, and then the electrostatic charge is charged by a toner. The latent image is developed to produce a visible image, and the visible image toner is transferred to a transfer material such as paper or OHP sheet, and then th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
CPCG03G9/09392G03G9/0935G03G9/0819G03G9/09716G03G9/09725G03G9/08795G03G9/09378G03G9/08797G03G9/0821G03G9/09357G03G9/0827
Inventor 木所广人
Owner ZEON CORP
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