Toner for electrostatic charge image development

A technology for electrostatic image development and toner, which is applied in the direction of developer, electrography, optics, etc., and can solve the problem of easy agglomeration of toner

Active Publication Date: 2007-07-11
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this toner is prone to agglomeration in high temperature environments

Method used

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  • Toner for electrostatic charge image development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142]75 parts of styrene, 20 parts of n-butyl acrylate, 5 parts of cyclohexyl methacrylate, 0.2 parts of divinylbenzene, and 0.4 parts of polymethacrylate macromer (manufactured by Toa Gosei Chemical Co., Ltd., commercialized Name "AA6") polymerizable monomer, 7 parts of carbon black (manufactured by Mitsubishi Chemical Corporation, trade name "#25B"), 1 part of resin for charge control (manufactured by Fujikura Chemicals, trade name "FCA-626-NS") "; weight average molecular weight 24,000, glass transition temperature 60°C), 10 parts of pentaerythritol tetramyristate and 0.2 parts of tert-dodecyl mercaptan were dispersed with bead mills at room temperature (23°C) to prepare polymerizable monomers combination.

[0143] On the other hand, at room temperature, 9.5 parts of magnesium chloride was dissolved in 250 parts of ion-exchanged water, and an aqueous solution obtained by dissolving 5.8 parts of sodium hydroxide in 50 parts of ion-exchanged water was slowly added under stir...

Embodiment 2

[0149] In Example 1, colored particles and a toner were obtained in the same manner as in Example 1 except that 0.2 parts of t-dodecylmercaptan was changed to 0.4 parts to prepare a monomer composition. Table 1 shows the characteristics of the obtained colored particles, toner characteristics and image quality evaluation results.

Embodiment 3

[0151] In Example 2, the polymerizable monomer composition was prepared without using pentaerythritol tetramyristate, and 4 parts of 2,2'-azobis-(2,4-dimethylvaleronitrile) were changed to 6 parts , except that it was the same as in Example 2 to obtain colored particles and toner. Table 1 shows the obtained coloring particle characteristics, toner characteristics and image quality evaluation results.

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Abstract

A toner for electrostatic charge image development, comprising color particles and an outer additive, wherein the color particles have a volume average particle diameter of 3 to 10 m and an average circularity degree of 0.950 to 0.995 and wherein in the molecular weight distribution obtained by GPC measurement of THF soluble contents resulting from filtration of a dispersion prepared by agitating the toner in THF, the peak area (a) of the molecular weight region from 500, 000 to 5, 000, 000 occupies 5 to 15% of the peak area of the whole region while in the molecular weight distribution obtained by GPC measurement of THF soluble contents resulting from filtration of a dispersion prepared by subjecting the above dispersion to ultrasonication, the peak area (b) of the molecular weight region from 500, 000 to 5, 000, 000 occupies 1 to 10% of the peak area of the whole region, the peak area (a) and the peak area (b) satisfying the relationship: 0 = a-b = 5.

Description

technical field [0001] The present invention relates to an electrostatic image developing toner for developing an electrostatic latent image formed by an electrophotography method (including an electrostatic recording method), and more particularly, to an electrostatic image containing colored particles and an external additive Toner for developing. Background technique [0002] Electrophotographic imaging is carried out as follows: the electrostatic image formed on the photoreceptor is developed by a developer (which may be referred to as "toner") to form a visible image (ie, "toner image"), and then the This toner image is transferred onto a transfer material such as paper or an OHP sheet, and then the toner image is fixed on the transfer material. [0003] Developers generally contain colored particles containing a binder resin and a colorant as functional components. Developers are roughly classified into two types, one is a two-component developer containing colored p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087
CPCG03G9/09741G03G9/0819G03G9/08795G03G9/0975G03G9/08755G03G9/0827
Inventor 太田玄一
Owner ZEON CORP
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