JPS58136048A - Negatively chargeable toner for developing static charge - Google Patents

Abstract

PURPOSE:To obtain a toner with superior triboelectric characteristics by adding a specified anthraquinone compound to a toner. CONSTITUTION:To a binding resin is added a compound represented by the general formula (where R1 is alkoxy or phenoxy, and R2 is H, alkoxy or phenoxy) preferably by 0.1-10pts.wt. of the amount of the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to toners, particularly negatively charged toners for electrostatic development.

Conventionally, electrostatic printing, electrophotography, and the like are well-known methods for developing an electrical latent image with toner to form a visible image in its entirety. For example, as an electrophotographic method, U.S. Patent No.
297,691, Japanese Patent Publication No. 42-23910, Japanese Patent Publication No. 43-24748, etc., are well known.

Generally, an electrical latent image is formed on a photoreceptor that exhibits photoconductivity by various means using a photoconductive material, and then the latent image is developed with gold toner to obtain a visible image; If necessary, the powder image is transferred onto paper or the like and then fixed by heating, pressure, solvent vapor, etc. to obtain a visible image. Father, Kara
- To obtain a multicolor image, the original is exposed using a color separation filter, and the above process is repeated multiple times using all color toners such as yellow, magenta, cyan, etc., and the toner images are superimposed to form a color image. 0 Toner for developing electrical latent images has conventionally been produced by dispersing colorants (dyes and pigments such as carbon black) in a binder resin such as polystyrene, which is then finely pulverized to about 1 to 30 microns. particles are used. The digging toner is usually mixed with a carrier material such as glass peas, iron powder, or fur and is used for the development of '1' images.

These toners require different physical and chemical properties. However, many of the known toners have several deficiencies as described below. That is, the triboelectric properties of many toners are adversely affected by changes in environmental humidity. In addition, with many toners, the density of the resulting image decreases due to mutual deterioration of the toner, carrier particles, and photosensitive plate due to collisions between toner particles and carrier particles due to repeated development due to continuous use, and contact between these particles and the surface of the photosensitive plate. changes,
Alternatively, the background density increases, reducing the quality of the copy.

Furthermore, with many types of toner, if an attempt is made to increase the density of a copied image by increasing the amount of toner adhering to the surface of the photosensitive plate having a residue, the background density will usually increase, resulting in the so-called fog phenomenon.

Since many of the known toners have one or more of the above-mentioned defects, there is a constant demand for improved toners.

In addition, it goes without saying that toners for color electrophotography in particular must have excellent physical and chemical properties that overcome the above-mentioned defects. must also satisfy the following conditions.

(1) The toner must be highly transparent in order to layer multiple colors.

(2) Each toner must have excellent melt miscibility.

(3) Spectral reflection characteristics must be good in order to faithfully reproduce the original.

In addition, for color toners, it is necessary to be able to freely adjust the color that the toner should have, regardless of the factors that determine the polarity of the triboelectric potential. For example, those that are compatible with known chemical load control agents [Special Publication No. 41-12
Metal complex salts of monoazo dyes described in Japanese Patent Publication No. 915, Japanese Patent Publication No. 43-27596, etc.;
The nitrofumic acid (salt) described in Publication No. 838 is
Since it is mostly black, its range of use is limited. Therefore, the development of a charge control agent having a desired color (for example, magenta, etc.) is also desired.

ITD, the present invention was realized in the current situation regarding toners mentioned above.

The main object of the present invention is to provide an electrostatic charge developing toner having excellent triboelectric properties.A further object of the present invention is to provide a statically charged toner with excellent triboelectric properties. The object of the present invention is to provide a negatively charged toner for electrostatic charge development that does not cause deterioration in copy quality.

Another object of the present invention is to provide a negatively charged magenta toner having excellent triboelectric properties.

The above object is achieved by providing a negatively charged toner characterized by containing a compound represented by the following general formula in a binder resin, preferably in an amount of 0.1 to 1 on part based on the resin. I can do it.

or phenoxy group.

The constituent components of the toner of the present invention will be explained in detail below.

Particularly important constituents of the toner of the present invention are anthraquinone compounds represented by the above-mentioned general formula. These compounds are present in the blood and give the toner excellent negative charge properties.These compounds mostly exhibit a bright red color and are not used alone as colorant components in magenta toners. Alternatively, it can be used in combination with other colorants, and of course provides excellent negative chargeability in that case as well.

These compounds are, for example, C,1,Disperse V
iolet26, C,1,Disperse Vi
olet 31. C, 1, I) isperseRed
11. C,1,5olvent Violet 2
Although the present invention is of course not limited to the above two examples, the present invention is not limited to the above two examples.

The addition of these compounds is not limited to the chargeability of the binder resin or the coloring agent added as an auxiliary agent, but generally speaking, the addition of these compounds is about 0.0% to the binder resin. 1
It is preferable to use it in the range of ~10% (by weight)! , 1~
stomach. If it is less than 0.1% (by weight), the charge control effect will be small.
Even if it exceeds 0 (weight)%, the charge control effect will deteriorate and the case will not be favorable. All known binder resins can be used as the binder resin for the toner of the present invention, such as polystyrene, polyP, etc.
- Homopolymers of styrene and its substituted products such as chlorostyrene and polyvinyltoluene; Sunalene-P-chlorostyrene copolymers, styrene-propylene copolymers, styrene-vinyltoluene copolymers, styrene-vinylnaphthalene copolymers, Styrene-methyl acrylate copolymer,
Styrene-ethyl acrylate copolymer, Sunalene-butyl acrylate copolymer, Styrene/-octyl acrylate copolymer, Styrene-methyl methacrylate copolymer, Styrene-ethyl methacrylate copolymer, Styrene-methacrylic acid Butyl copolymer, styrene-alpha chloromethyl methacrylate copolymer, styrene-acrylonitrile copolymer, styrene-vinyl methyl ether copolymer, styrene-vinyl ethyl ether copolymer, sterene-vinyl menal ketone copolymer , styrene-butadiene co-N
Styrenic copolymers such as styrene-isoprene copolymer, styrene-acrylonitrile-indene copolymer, sunalene-maleic acid copolymer, and styrene-maleic acid ester copolymer; polymethyl methacrylate-1.
, polybutyl methacrylate, polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, polyester, polyurethane, polyamide, evogishi resin, polyvinyl butyral, polyamide polyacrylic #111
Fat, rosin, modified rosin, terpene resin, phenol resin, aliphatic or alicyclic hydrocarbon resin, aromatic petroleum resin, chlorinated resin, paraffin wax, etc. can be used alone or in combination.

Further, as the carrier used in the developer, conventionally known carriers can be used. For example, magnetic substances such as iron, cobalt, and nickel, alloys and mixtures thereof, or coatings on the surfaces thereof are used.

For the developer in which the toner of the present invention is used, a fluidity modifier such as colloidal silica is added to the toner (1
, 01-fold Jilt% to 5-fold Lid% (preferably 0.1l1
% to 2% by weight).

The present invention will be explained in more detail with reference to Examples below. The number of copies is rjL and C.

[Example-1 100 parts of nopolystyrene resin, 6 parts of carbon black, C
, 1, 2 parts of a compound classified as Disperae Violet 31 were mixed and ground in a ball mill, then melted and kneaded in a roll mill, and after cooling), coarsely ground using a hummer mill, and then finely ground using an air jet type pulverizer. do. The obtained fine powder is classified to select 5 to 20μ and used as a toner. 3. For 10 parts of this toner, 90 parts tm of carrier iron powder (part name EF'V 250/400, manufactured by E1 Iron Powder Co., Ltd.) are added. It was used as a developer.

When the total tribo' load in this developer is measured, it is -4.9μ
It was rare at c/g. Note that the measurement of the tribopod operculum was carried out by the so-called blow-off method. (Details are described in the Collected Papers published by the Society of Electrophotography (1975, 5).) Also, in the following Examples and Comparative Examples, the tribocharge i
t' was completely measured.

Using this developer, a dry plain paper electrophotographic copying machine (parts name,
When copying was performed using an NP 5000 i Canon (manufactured by Nippon, Japan), a clear black image with no fog was obtained.

Furthermore, even though 10,000 copies were made continuously, no deterioration in the quality of the copied images was observed.

No deterioration in the properties of this toner was observed even after storage for half a year at room temperature and humidity.

[Example 2] The same procedure as in Example 1 was performed except for changing the toner composition to 5 parts, and a clear magenta image without fogging was obtained. Incidentally, the tribocharge amount of the toner was -6.1 μc/g6. [Comparative Example-1] The same procedure as in Example-1 was carried out except that the toner composition was changed.
The fogging was so severe that clear images could not be obtained. Incidentally, the triboelectric charge amount of the toner was -0.5 μc/g.

As described above, it can be seen that the toner of the present invention is a negatively charged toner having excellent characteristics as shown in Examples 1 and 2 and Comparative Example 1.

[Comparative Example-2] When the same procedure as in Example-1 was carried out except that the toner composition was changed as shown below, fogging was still severe and a clear image could not be obtained. Incidentally, the tribocharge amount of the toner was -1.1 μ4.

0.08 part [Comparative Example-3] The same procedure as in Example-1 was carried out except that the toner composition was changed as shown below, and the image density was sufficient, but
Characters lacked sharpness, and only vague magenta images were obtained.

25 parts [Examples 3 to 6] The same procedure as in Example 1 was carried out except that the toner composition was changed as follows, and a clear magenta image without fogging was obtained.

Claims (1)

[Claims] Negative charge ↑ Yoyotosu for electrostatic charge development, characterized by containing a compound represented by the following general formula in the N binding resin.
−. group, phenoxy group.