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Toner for electrostatic-image development

An electrostatic charge and toner technology, which is applied in the field of toner for electrostatic image development, can solve the problems of bad influence of initial printing performance, decrease of printing fine line reproducibility, bad influence of printing performance, etc. Superior printing performance, durability, and the effect of maintaining the reproducibility of thin lines

Active Publication Date: 2012-03-07
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the case of using conventional toner using external additives, initial printing in a severe environment such as high temperature and high humidity (H / H) is different from initial printing in a normal temperature and humidity (N / N) environment. Compared with time, it is easier to produce charge fluctuations, and cannot maintain the function of external additives, that is, the functions of imparting charge stability and fluidity to toner cannot be maintained.
As a result, there are problems such as poor start-up performance, deterioration of image quality due to initial fogging, etc., and adverse effects on initial printing performance.
[0006] In addition, in the process of continuous printing of multiple sheets, due to the mechanical stress in the developing device, that is, the increase in the number of contacts between the toner particles due to agitation, etc., it is easy to generate particles of external additives from toner particles. The surface of the carbon powder is buried to the inside, and / or it is free or detached from the surface of the carbon powder particle
As a result, there will be a problem that the reproducibility of thin lines of printing will decrease, and image quality will deteriorate due to fogging, etc., which will adversely affect the initial printing performance.

Method used

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  • Toner for electrostatic-image development
  • Toner for electrostatic-image development
  • Toner for electrostatic-image development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0217] Examples and comparative examples are given below to describe the present invention more specifically, but the present invention is not limited to these examples. In addition, parts and % represent a basis of weight unless otherwise specified.

[0218] The test methods performed in the present examples and comparative examples are as follows.

[0219] (1) External additives

[0220] (1-1) Number average primary particle size

[0221] The average primary particle diameter of the number of external additives is obtained by the following steps: take an electron micrograph of the particles of the external additive, and use an image processing and analysis device with the trade name Luzex IID manufactured by Nireco to determine the size of the particles in the relative frame volume area. The maximum area ratio is 2%, and the total number of treated particles is 100, and the arithmetic mean value of the circle equivalent diameter corresponding to the projected area of ​​the...

manufacture example 1

[0255] In a 3 L glass reactor equipped with a stirrer, a dropping funnel, and a thermometer, 623.7 g of methanol, 41.4 g of water, and 49.8 g of 28% ammonia water were added and mixed, and the temperature of the mixed solution was adjusted to 35°C.

[0256] While stirring the temperature-adjusted mixed solution, simultaneously start dropping a mixture of 1205.0 g of tetramethoxysilane and 100.6 g of tetrabutoxysilane, and 418.1 g of 5.4% ammonia water, tetramethoxysilane and tetrabutoxysilane The mixture was dropped for 6 hours, and 5.4% ammonia water was dropped for 5 hours.

[0257] After both were dropped, the mixed solution was further stirred for 0.5 hour to conduct hydrolysis to obtain a suspension of hydrophilic spherical silica sol particles.

[0258] Next, in the 3L glass reactor, an ester adapter and a condenser were installed. Then, the obtained suspension was heated until the temperature became 60 to 70° C., methanol was evaporated, and water was added thereafter....

manufacture example 2

[0274] In Production Example 1, in addition to changing the type of silane compound used as a hydrophobizing treatment agent, the octadecyltriethoxysilane represented by the above formula 6 was replaced by Toray Dow Corning represented by the following formula 8. Spherical silica sol particles B2 of Production Example 2 were prepared in the same manner as in Production Example 1, except for n-octyltriethoxysilane with a trade name of Z-6341 manufactured by the company. Table 1 shows the characteristics of the obtained spherical silica sol particles B2.

[0275] [chemical 8]

[0276] Formula 8:

[0277]

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PUM

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Abstract

A toner in which the desired functions of external additives (functions of imparting charge stability, flowability, etc. to the toner) can be maintained even when the toner is used in a severe environment such as a high-temperature high-humidity (H / H) environment, and which has satisfactory quick-electrification characteristics and long-term stability with respect to electrification characteristics and flowability. Even when used to conduct continuous printing on a large number of sheets, the toner retains the ability to reproduce thin lines, is less apt to cause deterioration of image quality attributable to blurring, etc., and has excellent long-term printing performance. The toner for electrostatic-image development comprises color resin particles comprising a binder resin and a colorant and external additives, and is characterized in that the external additives comprise an external additive (A) and an external additive (B), the external additive (A) is particles of a fatty acid metal salt, the content of the particles of a fatty acid metal salt being 0.01-0.5 parts by weight per 100 parts by weight of the color resin particles, and the external additive (B) is fine spherical colloidal silica particles having a number-average primary-particle diameter of 30-80 nm, the surface of which has been treated with a silane compound having a C8-20 alkyl group, the content of the fine spherical colloidal silica particles being 0.3-2.0 parts by weight per 100 parts by weight of the color resin particles.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image used for developing an electrostatic latent image in electrophotography, electrostatic recording, and electrostatic printing. The following is sometimes only referred to as "toner", and in more detail: The present invention relates to a toner for developing an electrostatic charge image that exhibits excellent initial printing performance and durable printing performance even under severe usage environments such as high temperature and high humidity (H / H). Background technique [0002] In imaging devices such as electrophotographic devices, electrostatic recording devices, and electrostatic printing devices, the method of developing the electrostatic latent image formed on the photoreceptor with toner to form the desired image is widely used. It is suitable for copiers and printers. , Fax machines, and their all-in-one machines. [0003] For example, in an electropho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/097
CPCG03G9/0827G03G9/09G03G9/09716G03G9/09725G03G9/09791
Inventor 佐光之法
Owner ZEON CORP