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An electrostatic charge image, toner technology, applied in the direction of developer, electrography, instrument, etc.
Inactive Publication Date: 2007-02-28
ZEON CORP
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However, the toner disclosed in Patent Document 3 needs to be improved in environmental durability.
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Embodiment 1
[0147]At room temperature, 81 parts of styrene, 19 parts of n-butyl acrylate, 7 parts of carbon black (produced by Mitsubishi Chemical Corporation, trade name "#25B"), 1 part of anti-negative resin (sulfonic acid functional group 2% Products, manufactured by Fujikura Chemical Co., Ltd., trade name "FCA S748"), 0.8 parts of divinylbenzene, 0.25 parts of polymethacrylate macromonomer (manufactured by Toa Gosei Chemical Co., Ltd., trade name "AA6"), 0.8 Parts of 2,2,4,6,6-pentamethylheptane-4-thiol and 10 parts of dipentaerythritol hexamyristate (acid value: 0.5 mgKOH / g, hydroxyl value: 0.9 mgKOH / g) were dispersed to obtain Polymerizable monomer composition.
[0148] In addition, 10.8 parts of magnesium chloride aqueous solution of magnesium chloride was dissolved in 250 parts of ion-exchanged water, while stirring, an aqueous sodium hydroxide solution in which 6.6 parts of sodium hydroxide was dissolved in 50 parts of ion-exchanged water was slowly added to prepare a magnesium h...
Embodiment 2
[0155] In addition to using 89 parts of styrene, 11 parts of n-butyl acrylate, 7 parts of carbon black (produced by Mitsubishi Chemical Corporation, trade name "#25B"), 1 part of anti-negative resin (product with 2% sulfonic acid functional group, Fujikura Chemical ( Co., Ltd., trade name "FCA S748"), 0.8 parts of divinylbenzene, 0.25 parts of polymethacrylate macromonomer (manufactured by Toa Synthetic Chemical Co., Ltd., trade name "AA6"), 0.8 parts of 2, 2, 4 , 6,6-pentamethylheptane-4-thiol and 10 parts of dipentaerythritol hexamyristate (acid value: 0.5 mgKOH / g, hydroxyl value: 0.9 mgKOH / g) to obtain a polymerizable monomer composition , and in the same manner as in Example 1, a toner for developing an electrostatic image was obtained. Evaluations of the properties and images of the obtained toner for electrostatic charge image development were carried out in the same manner as in Example 1. The results are shown in Table 1.
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PUM
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Abstract
The invention provides a toner for electrostatic charge image development that not only exhibits excellent offset property, excelling in environmental durability but also realizes stable image density. There is provided a toner for electrostatic charge image development, comprising colored resin particles containing a binder resin, a colorant, a charge control agent and a release agent, wherein (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) at 130 1 / 2 C and at a shear rate of 10 / s thereof is in the range of 3500 to 8000 Pa.s, (4) the shear viscosity (eta2) at 130 1 / 2 C and at a shear rate of 500 / s thereof is in the range of 300 to 1300 Pa.s, (5) the content (A) of components of <= 130 1 / 2 C evaporation temperature therein is <= 100 ppm, (6) the content (B) of components of > 130 1 / 2 C but <= 180 1 / 2 C evaporation temperature therein is <= 100 ppm, (7) the sum of A+B is <= 150 ppm, and (8) the ratio of A / B is <= 1.0.
Description
technical field [0001] The present invention relates to a toner for developing an electrostatic charge image, and more specifically, to a toner for developing an electrostatic charge image that is excellent in heat offset resistance, has good environmental durability and stable image density. Background technique [0002] Conventionally, many methods are known as image forming methods using the electrophotographic method. In these methods, the surface of the photoreceptor is usually charged by a charging member by various methods using a photoconductive substance, an electrostatic latent image is formed on the surface of the charged photoreceptor by a light irradiation device, and then the surface of the photoreceptor is charged with a toner. The electrostatic latent image is developed to form a visible image, and the toner that becomes the visible image is transferred to a transfer material such as paper or OHP sheet, and the transferred toner is fixed on the transfer mater...
Claims
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