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Toner for developing electrostatic images, electrostaic image development and imaging method thereof

An electrostatic image development, toner image technology, applied in the direction of developer, electric recording process using charge pattern, electric recording process using charge pattern, etc., can solve the problems such as difficult to design resin structure, and achieve high reliability , high image quality, and the effect of reducing fixing energy

Active Publication Date: 2012-03-14
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in previously used polymerization techniques, it has been difficult to precisely design resin structures that can accelerate plasticization by pressure

Method used

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  • Toner for developing electrostatic images, electrostaic image development and imaging method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0258]

[0259] Resin particle dispersion (A1) 168 parts (resin, 42 parts)

[0260] Colorant particle dispersion (P1) 40 parts (pigment, 8.6 parts)

[0261] Anti-sticking agent particle dispersion (W1) 40 parts (anti-sticking agent, 8.6 parts)

[0262] 0.15 parts of polyaluminum chloride

[0263] 300 parts of ion-exchanged water

[0264] In a round-bottomed flask made of stainless steel, the above-mentioned components were thoroughly mixed / dispersed according to the above-mentioned composition ratio using a homogenizer (Ultra-Turrax T50, manufactured by IKA Co.). Then, the contents of the flask were heated to 42° C. on an oil bath for heating, and kept at 42° C. for 60 minutes while stirring. Next, 84 parts of resin particle dispersion liquid (A1) (resin, 21 parts) was additionally added thereto, and the mixture was lightly stirred.

[0265] Use 0.5mol / L sodium hydroxide aqueous solution to adjust the pH of the system to 6.0. Then, the mixture was heated to 95°C while s...

Embodiment 2

[0293] In addition to using aluminum sulfate instead of polyaluminum chloride, and changing the pH during heating to 95°C to 7.0, resin particle dispersion (A2), release agent particle dispersion (W1) and colorant particle dispersion were used (P2), a toner was produced in the same manner as in Toner Example 1. The toner was evaluated in the same manner as in Toner Example 1. As a result, the minimum fixing temperature of this toner was 115°C. When the temperature is greater than or equal to 115°C, the toner exhibits sufficient fixability.

[0294] As for the continuous test retention, the initially satisfactory image quality was maintained to the end (sequential test retention: A).

Embodiment 3

[0296] A toner was produced in the same manner as in Toner Example 1 using the resin particle dispersion (A3), release agent particle dispersion (W2) and colorant particle dispersion (P2). As a result, the minimum fixing temperature of this toner was 105°C. When the temperature is greater than or equal to 105°C, the toner exhibits sufficient fixability.

[0297]

[0298] The developers were evaluated in the following manner. By using a Teflon (trademark) coated high-hardness SUS roller instead of a heating roller, the maximum fixing pressure is 9.5MPa (96.9kgf / cm 2 ) to refit the two-roller fixing unit, thereby refitting Docu Center Colorf450 manufactured by Fuji Xerox Co., Ltd.

[0299] Use Mirror Coat Platina Paper (256g / m2) designed by Fuji Xerox Co., Ltd. 2 ) as the receiving paper. Adjust the processing speed to 180mm / sec. The fixability of the toner was examined under this condition. As a result, the toner showed satisfactory oil-free fixability, and its minimum ...

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PUM

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Abstract

The invention provides a toner for electrostatic-image development, electrostatic-image developer, and method of image formation, the toner for electrostatic-image development is obtained by flocculating resin particles having a core-shell structure, wherein each of the resin particles includes a core including a first noncrystalline resin and a shell including a second noncrystalline resin, a glass transition temperature of the first noncrystalline resin differs by at least 20 DEG C from a glass transition temperature of the second noncrystalline resin, and the second noncrystalline resin includes an acid or basic polar group or an alcoholic hydroxyl group.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic image in electrophotography and a method for producing the toner. The present invention also relates to an electrostatic image developer comprising the electrostatic image developing toner and an image forming method. Background technique [0002] Even when the resin is polyaddition or polycondensation resin, it is premised to use a resin in which monomers are randomly arranged in the chain. Therefore, fixing acceleration using heat rather than pressure is mainly employed, so energy saving in electrophotography cannot be improved without significantly improving its development trend. In particular, there has not been a means to achieve high-speed fixing of thick paper using a simple fixing device, although the means is important when introducing electrophotography to the printing market. [0003] Therefore, it is necessary to reduce gloss unevenness that tends to occur in high-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08G03G13/00
Inventor 松村保雄
Owner FUJIFILM BUSINESS INNOVATION CORP