JPH06324516A - Electrostatic charge image developing toner, manufacture thereof, electrophotographic recording device therewith - Google Patents

Abstract

PURPOSE:To provide toner grains capable of obtaining an image having high resolution and excellent in the electrifying property and cleaning property by manufacturing the toner grains by the suspension polymerization method. CONSTITUTION:A monomer containing at least a polymerization initiator and a colorant is suspended in the water containing an inorganic or organic dispersant during high-speed stirring, then suspension polymerization is made during low-speed stirring to obtain electrostatic charge image developing toner grains. Acid is added at the time of the polymerization invert ratio of 50-90%, the dispersant existing on the outside and inside of toner grains is dissolved and removed, the monomer is polymerized under the existence of an electrification control agent, the outer shape is made amorphous, or the monomer is polymerized under the existence of polymer grains having the average grain size of 0.1-1mum, and projections are formed on the surfaces of the polymer grains.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic charge image developing toner used in electrophotographic copying, electrostatic printing, etc., a method for producing the same, and an electrophotographic recording apparatus using the same.

[0002]

2. Description of the Related Art The electrophotographic method, which is widely used in copying machines and laser printers, generally gives a uniform charge on a conductive insulator layer and partially erases the charge by irradiating a light image. To form an electrostatic latent image, and a fine powder called toner is attached to the portion where the electrostatic charge remains to form a toner image, and the toner image is transferred to recording paper and fixed to obtain a printed matter. Is.

Generally, such a toner is obtained by dispersing a colorant, a charge control agent and the like in a binder resin made of a high molecular compound, pulverizing it into particles having a particle size of about 10 to 20 μm, and classifying the toner. Alternatively, it is mixed with a carrier substance such as ferrite powder to form a developer, which is used for image formation by the electrophotographic method as described above, and thus the obtained image consists of only this toner.

In this manufacturing method (crushing method), particles having a broad particle size distribution are likely to be generated at the time of crushing, and in particular, the number of fine particles of less than 1 μm increases, which causes a problem that the yield deteriorates. Further, a large-scale soundproofing and dust collecting facility is required, and if a small particle size toner having a particle size of less than 10 μm is to be obtained in order to improve the resolution, the yield is further deteriorated.
Therefore, in order to solve such a problem, many methods for producing a toner by a suspension polymerization method have been proposed.

In the suspension polymerization method, a monomer phase in which a monomer, a polymerization initiator, a colorant, and if necessary, a magnetic material, a charge control agent, a crosslinking agent, etc. are uniformly dissolved or dispersed is used as a dispersant. The particles are suspended in a water phase containing them as droplets of several μm and then polymerized to obtain a toner having a target particle size. With this method, toner particles can be obtained in good yield, but there is a problem that the dispersant contained in the generated toner particles lowers the charging property and is difficult to remove.

Further, since the produced toner particles are usually spherical, there is a problem that the toner easily slips through the cleaning blade and a cleaning failure easily occurs. Several proposals have been made to make the toner particles in an irregular shape, but all of them are methods of applying a large external force to the particles during or after the polymerization to perform a special treatment, and the number of steps is increased accordingly. A new problem arises.

[0007]

SUMMARY OF THE INVENTION The present invention realizes a toner excellent in charging property or cleaning property by a production method using a suspension polymerization method, and at the same time, by using the present toner, It is intended to provide an electrophotographic apparatus capable of obtaining a high image.

[0008]

In order to solve the above-mentioned problems, the present invention suspends a monomer containing at least a polymerization initiator and a colorant in water containing an inorganic or organic dispersant under high-speed stirring, A toner for developing an electrostatic charge image, which is obtained by subsequently carrying out suspension polymerization under low-speed stirring, wherein an acid is added at a polymerization conversion rate of 50 to 90% to disperse the toner particles existing outside and inside. Disclosed is a toner in which the agent is dissolved and removed.

In this toner, a monomer containing at least a polymerization initiator and a colorant is suspended in water containing an inorganic or organic dispersant under high speed stirring, and then suspension polymerization is carried out under low speed stirring. A method of manufacturing a toner for image development, comprising:
When the polymerization conversion rate is 50 to 90%, an acid is added to dissolve and remove the dispersant existing outside and inside the toner particles.

In the present invention, a monomer containing at least a polymerization initiator and a colorant is suspended in water containing an inorganic or organic dispersant under high speed stirring, and then suspension polymerization is carried out under low speed stirring. A toner for developing an electrostatic charge image thus obtained, characterized in that the above-mentioned monomer is polymerized in the presence of a charge control agent to have an irregular outer shape.

In this toner, a monomer containing at least a polymerization initiator and a colorant is suspended in water containing an inorganic or organic dispersant under high speed stirring, and then suspension polymerization is carried out under low speed stirring. A method of manufacturing a toner for image development, comprising:
The monomer can be produced by a method characterized by polymerizing the monomer in the presence of a charge control agent to make its outer shape indeterminate.

In the present invention, a monomer containing at least a polymerization initiator and a colorant is suspended in water containing an inorganic or organic dispersant under high speed stirring, and then suspension polymerization is carried out under low speed stirring. A toner for developing an electrostatic charge image obtained by the method, wherein the monomer is polymerized in the presence of polymer particles having an average particle size of 0.1 to 1 μm to form protrusions on the surface thereof. I will provide a.

In this toner, a monomer containing at least a polymerization initiator and a colorant is suspended in water containing an inorganic or organic dispersant under high speed stirring, and then suspension polymerization is carried out under low speed stirring. A method of manufacturing a toner for image development, comprising:
It can be produced by a method characterized in that the above-mentioned monomer is polymerized in the presence of polymer particles having an average particle diameter of 0.1 to 1 μm to form protrusions on the surface thereof.

According to the present invention, the photosensitive member, voltage applying means for uniformly charging the surface of the photosensitive member, and the photosensitive member are exposed to form an electrostatic latent image on the photosensitive member. An electrophotographic recording apparatus comprising: an exposing unit for developing the electrostatic latent image into a toner image, a developing unit for developing the electrostatic latent image into a toner image, and a transferring unit for transferring the toner image onto a recording sheet. There is provided an electrophotographic recording device characterized by using the above-mentioned toner of the present invention as a toner.

In the present invention, a monomer phase is first obtained by dissolving or dispersing a polymerization initiator, a colorant and, if necessary, a magnetic material, a crosslinking agent, a charge control agent, etc. in the monomer. Next, this monomer phase is added to an aqueous phase containing a dispersant and the like 100
Suspend under high speed stirring of 0 rpm or more. The temperature during high-speed stirring is preferably 30 to 40 ° C. Then, switch to low speed stirring (less than 1000 rpm) to raise the temperature,
The stirring is continued for several hours to polymerize the monomer phase. The polymerization temperature is preferably 60 to 90 ° C.

Finally, filtration (or centrifugation) and redispersion are repeated to remove the dispersant, followed by drying to obtain toner particles. Examples of the monomer that can be used for producing the monomer of the present invention include styrene, o-methylstyrene,
p-methylstyrene, p-ethylstyrene, 2,4-dimethylstyrene, p-phenylstyrene, p-chlorostyrene, 3,4-dichlorostyrene, pn-butylstyrene, p-tert-butylstyrene, p- Styrenes such as n-hexyl styrene, pn-octyl styrene and pn-dodecyl styrene, olefins such as ethylene, propylene, butylene and isobrene, vinyl chloride, vinylidene chloride, vinyl bromide, vinyl fluoride and the like. Vinyl halides, vinyl acetate, vinyl propionate, vinyl butyrate, and other vinyl esters, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, propyl acrylate, n acrylate
-Acrylic esters such as octyl, dodecyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate,
Methacrylic acid esters such as n-butyl methacrylate, isobutyl methacrylate, n-octyl methacrylate, dodecyl methacrylate, 2-ethylhexyl methacrylate, vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, vinyl isotyl ether, acrylonitrile , Vinyl-based monomers such as acrylic acid such as methacrylonitrile and acrylamide, and methacrylic acid derivatives.

Examples of the polymerization initiator usable in the present invention include benzoyl peroxide (BPO), azoisobutyronitrile (AIBN), methyl ethyl ketone peroxide, isopropyl peroxy carbonate, cumene hydroperoxide, lauroyl peroxide and the like. Can be mentioned. As the colorant, any suitable pigment or dye may be optionally used, and wax may be added.

In the above-mentioned first aspect of the present invention,
When the polymerization conversion rate of the suspended particles reaches 50 to 90%, an acid is added to dissolve the dispersant so that it can be easily removed. Usually, a treatment for removing the dispersant is performed at the time when the polymerization is completed, but the dispersant remaining near the surface of the particles may not be removed after the resin is completely cured. Therefore, here, the treatment is performed before the resin particles are completely cured. Further, if the dispersant is dissolved before the polymerization proceeds, the stability of the suspension dispersion will be lost, resulting in coalescence of the suspended particles.

Examples of the dispersant which can be used in this embodiment include poorly water-soluble inorganic salts such as tricalcium phosphate, magnesium carbonate, calcium carbonate, barium carbonate, calcium sulfate and barium sulfate. As the acid for dissolving the dispersant, hydrochloric acid,
Most of sulfuric acid, nitric acid and the like can be used, but citric acid is particularly preferably used since there is a risk of corrosion of the reaction vessel and stirring blades.

In the second aspect of the present invention described above,
The charge control agent is added to the monomer phase before being suspended in the aqueous phase, and then suspension and polymerization are performed. Specific examples of such charge control agents include oxycarboxylic acid-based chromium complexes,
For example, there is Bontron E-80 (trademark of Orient). This charge control agent is a powder having a particle size of about 0.5 μm, and when it is contained in a monomer, it has an action of keeping a monomer droplet in an indefinite shape, whereby a special step is not performed.
Amorphous toner particles can be produced, and the cleaning property is improved.

Examples of inorganic or organic dispersants that can be used in this embodiment include silica, tricalcium phosphate, polyvinyl alcohol, gelatin, methyl cellulose, ethyl cellulose, methyl hydropropyl cellulose, starch, casein and the like. You can A surfactant may be used to further accelerate the dispersion, and examples of such a surfactant include sodium dodecyl sulfate and sodium dodecylbenzenesulfonate.

In the above-mentioned third aspect of the present invention,
Prior to the production of toner particles, first, polymer fine particles are produced. The fine polymer particles preferably have a particle size of 0.1 to 1 μm. The production of the polymer fine particles may be carried out by a usual emulsion polymerization, but in this case, since the surfactant used therefor deteriorates the electrostatic property of the toner particles, a soap-free emulsion polymerization without a surfactant is used. Is preferred. Next, when suspending the monomer phase in the aqueous phase, the obtained polymer fine particles are contained in the aqueous phase, and suspension polymerization is performed as described above. As a result, the polymer fine particles are driven into the monomer droplets, and a part of the polymer fine particles are ejected from the monomer droplets to cause protrusions on the resulting toner particles. Examples of the inorganic or organic dispersant that can be used in this embodiment are: , Poorly water-soluble inorganic salts such as tricalcium phosphate, magnesium carbonate, calcium carbonate, barium carbonate, calcium sulfate, barium sulfate, polyvinyl alcohol, polyvinyl alkyl ether, polyvinyl pyrrolidone, methyl cellulose, ethyl cellulose, methyl hydropropyl cellulose, carboxymethyl cellulose , Water-soluble polymers such as hydroxyethyl cellulose, gelatin, and casein. A surfactant may be used to further accelerate the dispersion, and examples of such a surfactant include sodium dodecyl sulfate and sodium dodecylbenzenesulfonate.

As the monomer useful for producing the polymer fine particles, any of the above-mentioned monomers for producing the toner particles can be used. Examples of the water-soluble polymerization initiator that can be used for producing the polymer fine particles include peroxides such as potassium persulfate and sodium persulfate, and azo compounds such as V-50 and VA-.
545, VA-546, VA-548, VA-500,
VA-552, VA-553, VA-558, VA-0
41, VA-044, VA-054, VA-058, V
A-059, VA-060, VA-080, VA-08
6 (all are trademarks of Wako Pure Chemical Industries, Ltd.).

The toner obtained as described above is used in an electrophotographic recording device. FIG. 1 is a schematic sectional view of an example of an electrophotographic recording apparatus according to the present invention. The developer 1 consisting of toner and carrier is agitated and mixed in the agitator 2 to be electrostatically charged. This developer is conveyed from the supply unit 3 to the developing roller 7 and forms a magnetic brush on this roller. On the other hand, the photoconductor drum 4 is uniformly charged by the pre-charging device 5 and imagewise exposed by the exposure device 6 to form an electrostatic latent image along the image pattern on the photoconductor drum. This electrostatic latent image is stroked by a magnetic brush on the developing roller, whereby toner 8 adheres and is developed along the image pattern to form a toner image. Then, this toner image is transferred onto a recording paper by the transfer device 9 and heated by the fixing device 10 to be fixed on the paper surface to obtain a printed matter. A part of the toner not transferred onto the surface of the recording paper is removed by the cleaning unit 11.

[0025]

The present invention will be further described below with reference to examples, but the present invention is not limited to these examples. In addition, "part" and "%" in the examples are shown by weight. Example 1 Monomer phase Styrene (manufactured by Wako Pure Chemical Industries) 425 parts n-Butyl acrylate (manufactured by Tokyo Chemical Industry) 75 parts AIBN (manufactured by Wako Pure Chemical Industries) 5 parts Carbon black (manufactured by Asahi Carbon) 25 parts Water phase phosphorus Tricalcium acid (Wako Pure Chemical Industries, Ltd.) 70 parts Sodium dodecylbenzene sulfonate (Wako Pure Chemical Industries, Ltd.) 0.1 parts Water 4000 parts Each reagent in the aqueous phase was mixed, and the atmosphere was replaced with nitrogen for 30 minutes.

The respective monomers in the monomer phase were mixed, and a homogenizer (manufactured by Masuda Rika Kogyo Co., Ltd.) was used to rotate the mixture at 5000 rpm for 5 minutes.
Stir for minutes to homogenize. The monomer phase was poured into the water phase immersed in a water bath at 40 ° C., and a histocol (manufactured by Nichine Medical Science Co., Ltd.) was used to stir at 18000 rpm for 60 minutes to suspend. This suspension was immediately transferred to a water bath at 80 ° C., and a three-one motor (manufactured by Ikeda Rika) was used for 200 r.
Stirring started at pm. Two hours after the initiation of polymerization, 10 parts of citric acid (manufactured by Wako Pure Chemical Industries, Ltd.) was added and stirring was continued, and the total was 8
Polymerized for hours.

The toner was obtained by repeatedly washing and drying by repeating filtration and redispersion. The polymerization conversion rate of the obtained toner particles was 90%, and the average particle size was 8 μm. No particles of the dispersant (tricalcium phosphate) were observed under a microscope. 42 parts of this toner and carrier G
A developer was prepared by mixing 1158 parts of F-120 (manufactured by Kanto Denka Co., Ltd.), and 4 using a F6144B printer manufactured by Fujitsu.
When a printing test was performed at 00 dpi, an image with high density and high resolution was obtained. Example 2 Polymerization was carried out in the same manner as in Example 1 except that n-butyl methacrylate was used instead of n-butyl acrylate to obtain a toner having an average particle size of 8 μm. Using this toner, a printing test was conducted in the same manner as in Example 1. As a result, an image with high density and high resolution was similarly obtained. Comparative Example 1 In the same manner as in Example 1 except that citric acid was not added,
A toner having an average particle size of 8 μm was obtained. When observed with a microscope,
A large amount of dispersant particles was observed. With this toner,
When a printing test was conducted in the same manner as in Example 1, it was found that the resolution was high but the density was low. Comparative Example 2 When the same treatment as in Example 1 was carried out except that citric acid was added 30 minutes after the initiation of polymerization, aggregation of suspended particles occurred,
Little toner particles were obtained. Comparative Example 3 A toner having an average particle size of 8 μm was obtained in the same manner as in Example 1 except that citric acid was added 7 hours after the initiation of polymerization. No particles of the dispersant were observed on the surface of the toner particles when observed under a microscope. However, when a printing test was conducted in the same manner as in Example 1 using this toner, the image density was higher than that in Comparative Example 1, but Examples 1 and 2 were used.
It was low compared to that. Comparative Example 4 A toner having an average particle size of 8 μm was obtained in the same manner as in Example 1 except that citric acid was not added during the polymerization and the toner particles were washed 10 times with a 1% citric acid aqueous solution after the completion of the polymerization. No particles of the dispersant were observed on the surface of the toner particles when observed under a microscope. However, when a printing test was conducted in the same manner as in Example 1 using this toner, the image density was higher than that in Comparative Example 1, but Examples 1 and 2 were used.
It was low compared to that. Example 3 Monomer phase Styrene (manufactured by Wako Pure Chemical Industries) 425 parts n-butyl acrylate (manufactured by Tokyo Kasei Kogyo) 75 parts Divinylbenzene (manufactured by Wako Pure Chemical Industries) 2 parts BPO (manufactured by Nacalai Tesque) 25 parts Carbon black ( Asahi Carbon) 25 parts Bontron E-82 (manufactured by Orient) 5 parts Water phase tricalcium phosphate (manufactured by Wako Pure Chemical Industries) 70 parts Sodium dodecylbenzene sulfonate (manufactured by Wako Pure Chemical Industries) 0.1 parts Water 4000 parts The respective reagents in the aqueous phase were mixed, and the atmosphere was replaced with nitrogen for 30 minutes.

The respective monomers in the monomer phase were mixed, and a homogenizer (manufactured by Masuda Rika Kogyo Co., Ltd.) was used to rotate the mixture at 5000 rpm for 5 minutes.
Stir for minutes to homogenize. The monomer phase was poured into the water phase immersed in a water bath at 40 ° C., and a histocol (manufactured by Nichine Medical Science Co., Ltd.) was used to stir at 18000 rpm for 60 minutes to suspend. This suspension was immediately transferred to a water bath at 80 ° C., and a three-one motor (manufactured by Ikeda Rika) was used for 200 r.
Stirring started at pm. Two hours after the initiation of polymerization, 10 parts of citric acid (manufactured by Wako Pure Chemical Industries, Ltd.) was added and stirring was continued, and the total was 8
Polymerized for hours.

The toner was obtained by repeatedly washing and drying by repeating filtration and redispersion. Most of the obtained toner particles were amorphous, and the average particle size was 8 μm. 42 parts of this toner and carrier GF-120 (manufactured by Kanto Denka) 11
A developer was prepared by mixing 58 parts, and was manufactured by Fujitsu F614.
When a printing test at 400 dpi was performed using a 4B printer, an image with high resolution was obtained. In addition, no cleaning failure was observed. Example 4 Polymerization was carried out in the same manner as in Example 3 except that n-butyl methacrylate was used instead of n-butyl acrylate to obtain an amorphous toner having an average particle size of 8 μm. Using this toner, a printing test was conducted in the same manner as in Example 3, and similarly, an image with high resolution was obtained. In addition, no cleaning failure was observed. Comparative Example 5 A spherical toner having an average particle size of 8 μm was obtained in the same manner as in Example 3 except that Bontron E-82 was not added. When a printing test was performed using this toner in the same manner as in Example 3, the resolution was high, but cleaning failure occurred on the second and subsequent sheets. Example 5 Production of Polymer Particles 10 parts of styrene ( manufactured by Wako Pure Chemical Industries, Ltd.) and 90 parts of water were mixed, and stirring was started at 80 ° C. and 200 rpm while performing nitrogen substitution. After 30 minutes, 0.1 parts of potassium persulfate (manufactured by Wako Pure Chemical Industries) dissolved in 10 parts of water was added,
The stirring was continued for 6 hours to carry out soap-free emulsion polymerization to obtain a dispersion liquid of polymer fine particles having a particle diameter of 0.3 μm.

Manufacture of Toner Particles Monomer Phase Styrene (manufactured by Wako Pure Chemical Industries) 425 parts n-butyl acrylate (manufactured by Tokyo Chemical Industry) 75 parts AIBN (manufactured by Wako Pure Chemical Industries) 5 parts Carbon black (manufactured by Asahi Carbon) 25 Part water phase tricalcium phosphate (manufactured by Wako Pure Chemical Industries) 70 parts sodium dodecylbenzene sulfonate (manufactured by Wako Pure Chemical Industries) 0.1 parts polymer fine particles (as solid content) 10 parts water 4000 parts each of water phases The reagents were mixed and purged with nitrogen for 30 minutes.

The respective monomers in the monomer phase were mixed, and a homogenizer (manufactured by Masuda Rika Kogyo Co., Ltd.) was used to rotate the mixture at 5000 rpm for 5 minutes.
Stir for minutes to homogenize. The monomer phase was poured into the water phase immersed in a water bath at 40 ° C., and a histocol (manufactured by Nichine Medical Science Co., Ltd.) was used to stir at 18000 rpm for 60 minutes to suspend. This suspension was immediately transferred to a water bath at 80 ° C., and a three-one motor (manufactured by Ikeda Rika) was used for 200 r.
Stirring started at pm. Two hours after the initiation of polymerization, 10 parts of citric acid (manufactured by Wako Pure Chemical Industries, Ltd.) was added and stirring was continued, and the total was 8
Polymerized for hours.

The dispersant and the surfactant were removed by repeating filtration and redispersion, and dried to obtain a toner. The obtained toner particles were nearly spherical, but had many protrusions, and the average particle size was 8 μm. Evaluation of Toner Particles 42 parts of the above toner and 1158 parts of carrier GF-120 (manufactured by Kanto Denka Co., Ltd.) were mixed to prepare a developer, and a printing test at 400 dpi was performed using a F6144B printer manufactured by Fujitsu. A high image was obtained. In addition, no cleaning failure was observed. Example 6 Polymerization was carried out in the same manner as in Example 5 except that n-butyl methacrylate was used instead of styrene in the production of polymer fine particles, and many protrusions were formed, and the average particle size was 8 μm.
m toner was obtained. When a printing test was conducted using this toner in the same manner as in Example 5, an image with high resolution was obtained. In addition, no cleaning failure was observed. Comparative Example 6 A spherical toner having an average particle size of 8 μm was obtained in the same manner as in Example 5 except that polymer particles were not used. Using this toner, a printing test was conducted in the same manner as in Example 5. As a result, although the resolution was high, cleaning failure occurred on the second and subsequent sheets. Comparative Example 7 Example 5 except that polymer microparticles were produced by conventional emulsion polymerization (that is, 0.1 part of sodium dodecyl sulfate was added as a surfactant to obtain microparticles of 0.1 μm).
In the same manner as described above, a toner having many protrusions and having an average particle diameter of 8 μm was obtained. When a printing test was conducted using this toner in the same manner as in Example 5, no defective cleaning occurred, but the resolution was inferior to that in Example 5.

The results of the printing tests obtained in the above Examples and Comparative Examples are shown in the table below.

[0034]

[Table 1]

[0035]

As described above, according to the present invention, a toner which can obtain an image with high resolution when used in an electrophotographic recording apparatus and which is excellent in charging property or cleaning property is provided. To be done.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an example of an electrophotographic recording apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Developer 2 ... Stirring unit 3 ... Supplying unit 4 ... Photosensitive drum 5 ... Pre-charging device 6 ... Exposure device 7 ... Developing roller 8 ... Toner 9 ... Transfer device 10 ... Fixing device 11 ... Cleaning unit

Claims (7)

[Claims] 1. Obtained by suspending a monomer containing at least a polymerization initiator and a colorant in water containing an inorganic or organic dispersant under high-speed stirring, and then performing suspension polymerization under low-speed stirring. A toner for developing an electrostatic image, characterized in that an acid is added at the time when the polymerization conversion rate is 50 to 90% to dissolve and remove the dispersant existing outside and inside the toner particles. 2. An electrostatic image development in which a monomer containing at least a polymerization initiator and a colorant is suspended in water containing an inorganic or organic dispersant under high-speed stirring, and then suspension polymerization is performed under low-speed stirring. The method for producing a toner for use according to claim 1, wherein an acid is added at a time when the polymerization conversion rate is 50 to 90%. 3. Obtained by suspending a monomer containing at least a polymerization initiator and a colorant in water containing an inorganic or organic dispersant under high speed stirring, and then performing suspension polymerization under low speed stirring. A toner for developing an electrostatic charge image, characterized in that the above-mentioned monomer is polymerized in the presence of a charge control agent to have an irregular outer shape. 4. An electrostatic image development in which a monomer containing at least a polymerization initiator and a colorant is suspended in water containing an inorganic or organic dispersant under high-speed stirring, and then suspension polymerization is performed under low-speed stirring. 4. The method for producing a toner according to claim 3, wherein the monomer is polymerized in the presence of a charge control agent. 5. Obtained by suspending a monomer containing at least a polymerization initiator and a colorant in water containing an inorganic or organic dispersant under high-speed stirring, and then performing suspension polymerization under low-speed stirring. A toner for developing an electrostatic image, wherein the monomer is polymerized in the presence of polymer particles having an average particle diameter of 0.1 to 1 μm to form protrusions on the surface thereof. 6. An electrostatic charge image developing method in which a monomer containing at least a polymerization initiator and a colorant is suspended in water containing an inorganic or organic dispersant under high-speed stirring, followed by suspension polymerization under low-speed stirring. 6. The method for producing a toner according to claim 5, wherein the monomer is polymerized in the presence of polymer particles having an average particle diameter of 0.1 to 1 [mu] m. 7. A photosensitive member, a voltage applying unit for uniformly charging the surface of the photosensitive member, and an exposing unit for exposing the photosensitive member to form an electrostatic latent image on the photosensitive member. When,
An electrophotographic recording apparatus comprising: a developing unit for developing the electrostatic latent image into a toner image; and a transfer unit for transferring the toner image onto a recording sheet, wherein the toner is used as the toner. Alternatively, an electrophotographic recording apparatus using the toner described in 5.