JPS623258A - Toner and developing method using it - Google Patents

Abstract

PURPOSE:To visualize an electrostatic latent image to form a high-quality image by suing a one-component type nonmagnetic toner composed of a resin having a group containing halogen or N atom on the terminal of the resin chain, and a pigment. CONSTITUTION:The one-component type nonmagnetic toner composed of a resin having a group containing halogen or N atom on the terminal of the resin chain, and a pigment is used, and the resin is obtained by using a compound having a halogen or N atom at a chain transfer agent, and an N- containing compound as a polymerization initiator, and another N-containing compound as a chain transfer agent and a polymerization initiator, and combining these processes, thus permitting the obtained toner to be sufficiently stable even under conditions of high temperature and high humidity, and low temperature and low humidity, and a high-quality image to be obtained by development.

Description

Detailed Description of the Invention [Technical field to which the invention pertains] The present invention relates to a one-component non-magnetic toner that can be used in copying machines, printers, facsimile machines, etc. using electrophotography, and an electrostatic latent toner using the same. This invention relates to a developing method for visualizing an image.

[Prior art and its problems]

2. Description of the Related Art In order to visualize electrostatic latent images formed on photoreceptors or dielectrics in electrophotographic devices or electrostatic recording devices, various developers have been researched and developed. As a result, various developers described below have been put into practical use.

The first example is a two-component developer consisting of a toner and a carrier. Although this developer is widely used because of its good image quality, it is known to have the following drawbacks. In other words, the toner receives a triboelectric charge due to the mutual friction between the toner and the carrier, but in this case, if the toner is used for a long period of time, the carrier surface becomes contaminated with the toner, and as a result, it is not possible to acquire a sufficient charge. It disappears.

(2) The mixture ratio of toner and carrier must be adjusted within a predetermined range, but if used for a long period of time, the mixture ratio will fluctuate and deviate from the predetermined range.

(2) Generally, iron powder or glass beads with oxidized surfaces are often used as carriers, but in this case, the surface of the photoreceptor is mechanically damaged by these carriers.

The second type includes a one-component developer consisting only of toner. Among these, U.S. Patent No. 3.9
09.258 and 4.121.931, etc., and which has magnetic sensitivity and is generally called a magnetic toner has been put into practical use. However, these developers are also known to have the following drawbacks. Namely, since magnetic toner with relatively low resistivity is used, it is difficult to electrostatically transfer the developed image on the electrostatic latent image to a supporting member such as plain paper, especially in a humid atmosphere. In this case, sufficient transfer cannot be obtained.

■Color toner cannot be obtained because the toner contains a large amount of magnetic powder.

A third example is a developer made of a one-component non-magnetic toner with a large specific resistance and containing no magnetic powder.

For example, U.S. Pat. No. 2,895,847
'It is used in the touchdown method, impression method, and jumping method described in Japanese Patent Publication No. 3.152.012, Japanese Patent Publication No. 41-9475, Japanese Patent Publication No. 45-2877, Japanese Patent Publication No. 54-3624, etc.

A developer made of this one-component non-magnetic toner has the advantage that it has a semi-permanent lifespan as a developer does not cause carrier surface contamination compared to a developer made of two-component toner. .

Furthermore, the developer made of two-component toner has
“In order to maintain a constant toner concentration on the image side, a complex developing device such as a toner concentration detector and a constant amount toner supply device is required. Since the developing method using a developer does not require these mechanisms, it is possible to downsize and lower the cost of the developing device.Also, compared to a developer made of -component magnetic toner, the color of the toner is It has excellent characteristics such as a wide selection range and full color support. However, developers made of one-component non-magnetic toner are also known to have the following drawbacks.

The first drawback is the problem of triboelectric charging. In other words, the developer is brought into contact with the developing roll efficiently and in an extremely short time in order to obtain the amount of charge necessary to visualize the electrostatic latent image formed on the photoreceptor drum or dielectric material without contact. must be disciplined.

However, in the case of a one-component non-magnetic toner, it is not possible to obtain a sufficient amount of charge to form a visible image due to the short friction time when the toner is charged by friction with a developing roll. In order to improve charging properties, methods of adding various charge control agents to toner have been adopted, but in this case, it is difficult to uniformly disperse the charge control agent in the toner. Therefore, uneven charging occurs in the toner, which tends to cause image quality deterioration such as ground blur. In addition, many charge control agents are hygroscopic materials, which has the serious disadvantage of adversely affecting the moisture resistance of the toner, making images more susceptible to environmental changes such as high temperature and high humidity, and low temperature and low humidity. arise. Furthermore, since many charge control agents are colored, when used in color developers, it becomes extremely difficult to develop the normal hue, bare skin, and brightness of the developer.

The second drawback is the problem of applying the developer very thinly and evenly on the surface of the developing roll.

- When a component-based magnetic toner is used, the toner is applied thinly onto a toner carrier, and then the toner is made into a thin layer using a doctor blade in order to be held on the toner carrier. In this way, toner can be easily supported on the toner carrier by electrostatic force and magnetic force.

On the other hand, with one-component non-magnetic toner, an elastic blade and a toner carrier are brought into pressure contact and the toner is forcibly conveyed to this pressure-contact area, thereby triboelectrically charging the toner and forming a thin layer. can.

However, when toner is charged by this method, the pressure contact portion between the elastic blade and the toner carrier is usually 1
They are pressed together at a pressure of 00g/cnl to 2500g/csl, and when the toner passes through this pressured part,
Mechanical pulverization or agglomeration causes problems such as fog or unevenness in the toner formed. Possible causes of these problems include the low softening point of the binder resin of the toner and the low glass transition point. In order to prevent this, when the softening point of the binder resin is increased, the fixing temperature becomes high, making it unsuitable for use in ordinary copying machines.

[Purpose of the invention]

The present invention was made with the aim of solving the above-mentioned problems, and is stable under conditions of high temperature and high humidity or low temperature and low humidity, and has a halogen atom at the end of a resin chain that can be strongly and uniformly charged. Alternatively, a one-component non-magnetic toner consisting of a resin and a pigment having a group containing a nitrogen atom, and a developing method that can visualize an electrostatic latent image and provide a high-quality image by using this toner. This is what we provide.

[Summary of the invention]

The present invention relates to a one-component non-magnetic toner comprising a resin and a pigment having a group containing a halogen atom or a nitrogen atom at the end of the resin chain, and a developing method using the one-component non-magnetic toner.

The resin having a group containing a halogen atom or a nitrogen atom at the end of the resin chain, which is a component of the one-component nonmagnetic toner of the present invention, refers to a group containing a halogen atom or a nitrogen atom.
Those that are present at the end of the resin chain, and those that are present within the resin chain are not included.

If the resin has a group containing a halogen atom in its chain,
This impairs the thermal stability of the resin, and a portion of the resin is thermally decomposed and colored during thermal kneading during the toner manufacturing process. For this reason, in the case of color toner, the saturation of the color is impaired, which is undesirable.

In addition, if the resin has a group containing a nitrogen atom in its chain,
Inferior in moisture resistance, transparency, etc.

A resin having a group containing a halogen atom at the end of the resin chain is
A resin that is negatively charged and has a group containing a nitrogen atom is positively charged.

The resin that can be used here is desirably one that can easily undergo a chain transfer reaction. Examples of resin monomers that correspond to this include styrene, 0-methylstyrene, p
- Styrenes such as methylstyrene and 2,4-dimethylstyrene; vinylnaphthalenes; ethylene, propylene,
Ethylenically unsaturated monoolefins such as isobutylene and butadiene; vinyl esters such as vinyl acetate and vinyl propionate; methyl diacrylate, ethyl acrylate,
Alkyl esters of acrylic acid such as propyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, and dodecyl acrylate; and methyl methacrylate, ethyl methacrylate, and propyl methacrylate. , alkyl esters of methacrylic acid such as n-butyl methacrylate and isobutyl methacrylate; and the like. Resins that can be obtained from these monomers include one or two types.
It can be a single polymer or a copolymer consisting of more than one type of monomer.

Among the usable resins, styrene-acrylic resin or styrene-methacrylic resin is preferred. In this case, the content of the styrene component in the resin is 70 mol% or more,
Preferably it is 80 mol% or more. If it is less than 70 mol %, the amount of charge will be small and it will be difficult to form a single layer of toner on the toner carrier. Furthermore, since the ratio of being charged to opposite polarity increases in the resin, it causes fogging during development. The content of the acrylic component or methacrylic component is 5 to 30 mol%, preferably 7 to 20 mol%. If it is less than 5 mol%, sufficient internal molding of the resin will not be possible, and the glass transition temperature (Tg) of the resin will not fall within the appropriate temperature range for development (approximately 55 to 70 degrees Celsius), making it difficult to develop. Mechanical strength against external stress during the process is also insufficient. Moreover, if it exceeds 30 mol %, the charging performance of the resin deteriorates, making it difficult to form a toner layer and causing fog during development.

Methods for producing a resin having a group containing a halogen atom or a nitrogen atom at the end of the resin chain include (1) a method of polymerizing using a compound containing a halogen atom or a nitrogen atom as a chain transfer agent; (2) a method of polymerizing a compound containing a halogen atom or a nitrogen atom; A method of polymerizing using a compound containing an atom as a polymerization initiator; (3) A method of using a compound containing a nitrogen atom as a chain transfer agent and a polymerization initiator and polymerizing a combination of these; etc. can be mentioned. As the polymerization method in these methods, emulsion polymerization is preferred. In the case of emulsion polymerization, for example, a dispersion solvent containing an emulsifier is heated to an appropriate temperature. Next, predetermined amounts of monomers, chain transfer agents and/or polymerization initiators to be used are added all at once or in portions.

After addition, by further heating, a milky lotion containing the desired resin can be obtained. Thereafter, the resin and the emulsifier are separated and purified using a transparent method to obtain a resin having a group containing a halogen atom or a nitrogen atom at the end of the resin chain.

When producing a resin having a group containing a halogen atom or a nitrogen atom at the end of the resin chain by the method described above, the molecular weight of the resin to be obtained is adjusted by appropriately changing the amount of the chain transfer agent used. be able to. Further, the molecular weight and molecular weight distribution of the resin can be controlled so that thermal properties with excellent fixing properties can be obtained.

Examples of the chain transfer agent containing a halogen atom used here include CCl4, CHCl3 zCH
2CH2Br2CH2Br2 t CH31, C2H5
CCl2=CC12゜CH2=CHCH2Cl
, CNCl, COCl2, CBrCl3,
CBr4゜CH3CCl3. CC13CH2CH2C
1, CC13C02C2H5°, etc.

As the chain transfer agent containing a nitrogen atom, for example, 2-aminobenzenethiol, 2-amino 6-purinthiol, 1
．． 1 diphenylthiourea, 1,3 diphenylthiourea,
1,3 dimethylthiourea.

8,8゛quinolyl disulfide, di-8-quinolyl disulfide, 4-dimethylaminophenyl disulfide, 4-diethylaminophenyl disulfide, 4-dibutylaminophenyl disulfide,
2-dimethylaminophenyl disulfide, 2-diethylaminophenyl disulfide, 2-dibutylaminophenyl disulfide, 4-dihexylaminophenyl disulfide, 2-dihexylaminophenyl disulfide, 4-diphenylaminophenyl disulfide, 2 disulfide -diphenylaminophenyl, 4-aminophenyl disulfide, 2-aminophenyl disulfide, butylamine, diethylamine, triethylamine, 0-
Toluidine, m-toluidine, p-toluidine, 2.4
-Xylidine, 2.5-xylidine, 3,4-xylidine, 3.3 dithiodipyridine, 4.4' dithiomorpholine, 2.2° dithiobis(benzothiazole), thioimidodicarbonic diamide, 2-mercapto Examples include benzimidazole and the like.

Examples of the polymerization initiator containing a nitrogen atom include azobisisobutyronitrile, 4.4'-azobis-(
4-cyanovaleric acid), 2.2”-azobis-(4-methoxy-2,4-dimethylvaleronitrile), 1.1°
-Azobis(cyclohexane-1-carbonitrile),
2.2''-azobis(2-amidinopropane) dihydrochloride, 2.2°-azobis(2,4-dimethylvaleronitrile), p,p'-cyanobenzoyl peroxide, m.

Examples include mo-cyanobenzoyl peroxide, m-cyanobenzoyl peroxide, m,m'-nitrobenzoyl peroxide, and p,p'-nitrobenzoyl peroxide.

The molecular weight of the obtained resin having a group containing a halogen atom or a nitrogen atom only at the end of the resin chain is a weight average molecular weight of 50.000 to 250,000, preferably 100.
．． There are 000 to 200,000. If the weight average molecular weight is less than 50,000, the toner will fuse to the fixing device during fixing, resulting in so-called high-temperature offset development.

If it exceeds 250,000, a lot of thermal energy is required to melt the toner during fixing, so the fixing temperature must be increased.

Further, the proportion of halogen atoms or nitrogen atoms in the resin can be adjusted by controlling the molecular weight distribution of the resin. Even if resins have the same weight average molecular weight, the wider the molecular weight distribution, the greater the number of molecules contained in the same weight, and the more halogen atoms or nitrogen atoms can be included. The ratio of halogen atoms or nitrogen atoms in the resin suitable for the present invention is expressed in a resin having a molecular weight within the above-mentioned range and having a molecular weight distribution (weight average molecular weight/number average molecular weight) of 2 to 15. When the molecular weight distribution is less than 2, good charging properties cannot be obtained because the amount of halogen atoms or nitrogen atoms contained in the resin is small. In addition, if the molecular weight distribution exceeds 15, moisture resistance and heat resistance will deteriorate due to the large amount of halogen atoms or nitrogen atoms in the resin, and furthermore, the resin itself will be colored, resulting in the hue when used as a color toner. adversely affect.

Pigments that are constituent components of the one-component non-magnetic toner used in the present invention include carbon blacks such as furnace black, acetylene black, and thermal black, perylene pigments, phthalocyanine pigments, quinacridone pigments, and azo pigments. Various pigments can be used. In the case of a positively or negatively charged pigment, it can be used by treating it with a negatively or positively charged surface treatment agent, respectively. Furthermore, positively or negatively charged hydrophobic silica may be added to improve the fluidity or agglomeration resistance of the toner.

The one-component non-magnetic toner used in the present invention consists of a resin having a group containing a halogen atom at the end of the resin chain and the above-mentioned negatively charged pigment, or a resin having a group containing a nitrogen atom at the end of the resin chain. The above-mentioned positively charged pigments can be obtained by mixing, mixing, pulverizing, etc. using appropriate means. Furthermore, after performing treatments such as mixing and pulverization as necessary, a toner having uniform particle size can be obtained by classifying the toner by an appropriate method. The one-component non-magnetic toner thus obtained has an average particle size of 1
It is 0 to 15 μm, and the amount of charge upon blow-off is 20 to 40 μc/g when expressed as an absolute value.

In order to use and develop the one-component non-magnetic toner of the present invention described above, it can be carried out using the developing device shown in the attached drawings. Publication No. 45468, JP-A-60-73
This is described in Japanese Patent Application Laid-open No. 648 and Japanese Patent Application Laid-Open No. 60-73649.

Hereinafter, one embodiment of the developing method of the present invention will be explained in detail with reference to the drawings.

Reference numeral 1 in the figure is a developing roll that serves as a toner carrier, and 2 in the figure is an elastic blade that is pressed against the toner carrier at its belly portion. The one-component non-magnetic toner 4 stored in the developer container 3 is conveyed through the pressure contact portion between the developing roll 1 and the elastic blade 2 as the developing roll 1 rotates. During transportation, the one-component non-magnetic toner 4 is charged positively or negatively due to friction caused by contact between the developing roll 1 and the elastic blade 2 . Thereby, the one-component non-magnetic toner 4 can be electrically or physically attached to the developing roll 1 to form a thin layer. Next, a one-component non-magnetic toner 4 that has been positively or negatively charged on the developing roll 1 and a one-component non-magnetic toner of opposite polarity are placed on a photosensitive drum 5, which serves as an electrostatic latent image carrier, and is placed at a constant interval from the developing roll 1. Apply voltage. Thereby, the electrostatic latent image on the photoreceptor drum 5 can be visualized with the one-component non-magnetic toner 4. Further, during development, a DC bias voltage or an AC bias voltage superimposed on the DC bias voltage can be applied between the developing roll 1 and the photosensitive drum 5.

Hereinafter, the present invention will be explained in further detail with reference to Examples and Comparative Examples.

In addition, in Examples and Comparative Examples, all "parts" represent "parts by weight".

[Embodiments of the invention]

Example 1 (1) Preparation of a resin having a group containing a chlorine atom at the end of the resin chain (a) Dispersion solvent Surfactant Emal 0 (manufactured by Hanatamaishi M Co., Ltd.) 5 parts Water 1500 parts Methanol 300 parts Silicone defoaming Agent TSA730 (manufactured by Toshiba Silicone Corporation) 0.2 parts (b) Monomer composition n-butyl methacrylate 150 parts Styrene 450 parts (c) Chain transfer agent Carbon tetrachloride 150 parts (d) Polymerization initiator Persulfuric acid Potassium (4 weight percent aqueous solution) 100 parts Sodium acid sulfite (4 weight percent aqueous solution) 10
After heating 0 part (a) to 60° C., 1/4 amount of (b) and (c) was added and stirred to form an emulsified state.

While dropping the remainder of (b) and (C), add 1/1/2 of (d).
The mixture was divided into 10 portions and added over 2 hours. (b) and (c) were also added dropwise over 2 hours. Then, after further heating for 2 hours, the reaction solution was cooled. The obtained resin emulsion was dropped into methanol and purified to obtain the desired resin. The weight average molecular weight of this resin is 156,000,
Tg was 65°C.

(2) Preparation of toner 95 parts of the resin prepared in (1) 5 parts of carbon black MA100 (manufactured by Mitsubishi Kasei Corporation) - The components of the above composition were mixed and kneaded using a pressure kneader, and then mixed and kneaded using a jet mill. After pulverization, classification was performed using an air classifier to obtain a black toner having an average particle size of about 13 μm.

The amount of charge due to blow-off of this toner is -30 μc/g.
Met.

An image test was performed using this toner using a plain paper copying machine (trade name: Rheodory 4515) incorporating the developing device shown in FIG. The test was conducted at normal temperature and humidity (23℃, 60%),
1 each under the conditions of high temperature, high humidity (35℃, 80% or more), and low temperature and low humidity (5℃, 10% or less).
Ten thousand pictures were printed, and the image quality was compared with the image at normal temperature and humidity to determine the deterioration of the image quality from the initial image. As a result, the resulting image had fewer capris, was faithful to the original, and was clear. In addition, even after testing 10,000 continuous images, it showed stable images with little fog, at low temperatures and low humidity.

Almost no image deterioration was observed even under high temperature and high humidity conditions.

Example 2 (1) Preparation of resin having a group containing a chlorine atom at the end of the resin chain Ca > Dispersion solvent Surfactant Emal 0 (manufactured by Kao Soap Co., Ltd.) 5 parts Water 1500 parts Methanol 300 parts Silicone antifoaming agent TSA730 (manufactured by Toshiba Silicone Co., Ltd.) 0.2 parts (b) Monomer composition n-butyl methacrylate) 100 parts 2-ethylhexyl acrylate 100 parts Styrene
900 parts (C) Chain transfer agent carbon tetrachloride 300 parts (d) Polymerization initiator potassium persulfate (4 weight percent aqueous solution) ioo parts
゛Acidic sodium sulfite (4 weight percent aqueous solution) 10
0 parts The desired resin was obtained in the same manner as in Example 1 using the above (a) to (d).

The weight average molecular weight of this resin is 123,000, T g
was 63°C.

(2) Preparation of toner 95 parts of resin prepared in (1) 5 parts of carbon blank MALOO (manufactured by Mitsubishi Kasei Corporation) 'Each component of the above composition was treated in the same manner as in Example 1, and the average particle size was approx. A black toner of 13 μm was obtained.

The amount of charge due to blow-off of this toner is -33μC/g
Met.

Using this toner, the same evaluation test as in Example 1 was conducted. The obtained images were free from fog and toner scattering, and the images after continuous detection and testing were the same as the initial images, and had good environmental resistance.

Comparative Example 1 Styrene-n-butyl methacrylate copolymer (no halogen atom at the end of the resin chain) 95 parts Carbon black MA100 (manufactured by Mitsubishi Kasei Corporation)
A toner was prepared in the same manner as in Example 1 using 5 parts of each component of the above composition. The average particle size of the obtained toner was approximately 13
It was μm. The amount of charge due to blow-off is -16μc/g
Met.

Using this toner, the same evaluation test as in Example 1 was conducted. This toner could not be sufficiently charged, and the toner could not be satisfactorily adhered to the toner carrier. As a result, the initial image was already defective.

Example 3 (1) Preparation of a resin having a group containing a nitrogen atom at the end of the resin chain (a) Dispersion solvent Surfactant Emal O (manufactured by Kao Seki M Co., Ltd.) 5 parts Water 1500 parts Silicone antifoam agent TSA730 ( (manufactured by Toshiba Silicone Corporation) 0.2 parts (b) Monomer component 1 so-butyl methacrylate 400 parts Styrene 100 parts 2-ethylhexyl acrylate 50 parts (C) Chain transfer agent 4.4"-dithioaniline 5 parts ( d) Polymerization initiator Azobisisobutyronitrile 5 parts After heating (a) to 60°C, (b), (c) and (d) were added and stirred to make an emulsified state. After heating at ℃ for 4 hours, the reaction solution was cooled.The obtained resin emulsion was added dropwise to methanol and purified to obtain the desired resin.The weight average molecular weight of the obtained resin was about 100. 00
0, Tg was approximately 60°C.

(2) Preparation of toner 95 parts of the resin prepared in (1) 5 parts of Cyanine Blue KBN (manufactured by Dainichiseika Co., Ltd.) The components having the above composition were treated in the same manner as in Example 1,
A bright blue toner with an average particle size of about 13 μm was obtained. The charge amount of this toner due to blow-off was +30 μc/g.

Using this toner, the same evaluation test as in Example 1 was conducted.

As a result, the resulting image had less fog and was able to provide a clear image that was faithful to the original. Furthermore, even after testing 10,000 images continuously, stable images with little fog were exhibited. Almost no image deterioration was observed under low temperature, low humidity, or high temperature and high humidity conditions.

Example 4 (1) Preparation of a resin having a group containing a nitrogen atom at the end of the resin chain (a) Dispersion solvent Surfactant Emal O (manufactured by Kaoseki Th & Co., Ltd.) 5 parts Water 1500 parts Silicone antifoam agent TSA730 ( (manufactured by Toshiba Silicone Corporation) 0.2 parts (b) Monomer component styrene 400 parts n-butyl methacrylate 100 parts 2-ethylhexyl acrylate 50 parts (C) Chain transfer agent bis(O-benzamidophenyl) disulfide 5: 5 parts, :(d) Polymerization initiator
・Bright, :1 Azobisisobutyronitrile 5 parts
”°,!P;1 Using each of the components (a) to (d), Example 3 and
, D, 1 The target resin was obtained by a similar method.
``The weight average molecular weight of the obtained resin is approximately 150.000,
1″:); Tg was about 63°C.

(2) Preparation of toner 95 parts of resin prepared in (1) 5 parts of carbon black MA100 (manufactured by Mitsubishi Kasei Corporation) Using each component of the above composition, in the same manner as in Example 1,
A black toner with an average particle size of 13 μm was obtained.

The amount of charge due to blow-off of this toner is +28μc/
g was 0. Using this toner, the same evaluation test as in Example 1 was conducted. The resulting image was free from fog and toner scattering.

The image quality after the continuous test was almost the same as the initial image, and the environmental resistance was also good.

Comparative Example 2 Styrene-n-butyl methacrylate copolymer (no nitrogen atom at the end of the resin chain) 92 parts Carbon black MAIO 05 parts Nigrosine dye 3 parts Each component of the above composition was added to a toner in the same manner as in Example 1. was prepared. The average particle size of this toner was about 13 μm. The amount of charge due to blow-off was +30 μc/g.

Using this toner, the same evaluation test as in Example 1 was conducted. As a result, the image quality was good with no fog at room temperature and humidity, but there was a lot of fog and poor image quality at high temperature and humidity.

〔Effect of the invention〕

The developing method of the present invention has a semi-permanent developer life compared to the conventional method using two-component magnetic toner.
It is excellent in that it can be made compact and the developing device can be made compact. Furthermore, compared to a developing method using a -component magnetic toner, this method is superior in that it can be applied to color applications because it does not contain black or brown magnetic powder.

Furthermore, the developing method of the present invention can maintain the initial development characteristics even when used continuously for a long period of time, and is sufficiently stable under conditions of high temperature and high humidity, and low temperature and low humidity.
High-quality images can be developed, and its industrial value is extremely large.

[Brief explanation of the drawing]

FIG. 1 shows a schematic sectional view of a developing device used in the present invention. Figure 1

Claims (1)

[Scope of Claims] 1. A one-component nonmagnetic toner comprising a resin and a pigment having a group containing a halogen atom or a nitrogen atom at the end of the resin chain. 2. The one-component non-magnetic toner according to claim 1, wherein the resin is a styrene-acrylic resin or a styrene-methacrylic resin. 3. A one-component non-magnetic toner made of a resin and a pigment having a group containing a halogen atom or a nitrogen atom at the end of the resin chain is adhered onto the toner carrier using an elastic blade pressed onto the toner carrier; After forming a thin layer of one-component non-magnetic toner, the toner is developed by transferring the toner onto a latent image on an electrostatic latent image carrier placed at a constant distance from the toner carrier. A developing method. 4. The developing method according to claim 3, wherein the resin is a styrene-acrylic resin or a styrene-methacrylic resin.