JPH08305084A - Production of toner for developing electrostatic charge image - Google Patents

Abstract

PURPOSE: To provide a method for producing a toner by which polymerized toner particles having a sharp particle diameter distribution are efficiently and stably produced by suspension polymn. under easy control of particle diameter. CONSTITUTION: A polymerizable monomer compsn. contg. at least a polymerizable monomer and a colorant is granulated in an aq. dispersive medium contg. a dispersion stabilizer by the actions of shear, colliding force, a pressure change, cavitation and a potential core produced by a rotor 1 rotating at high speed and a screen 2 enclosing the rotor 1. The granulated compsn. is suspension-polymerized to form polymerized toner particles and the objective toner is produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a toner for developing an electrostatic charge image formed by an electrophotographic method, an electrostatic recording method or the like, and more specifically, a particle size distribution by a suspension polymerization method. And a method for producing a toner for developing an electrostatic charge image capable of efficiently producing sharp polymerized toner particles.

[0002]

2. Description of the Related Art Conventionally, in an electrophotographic apparatus, an electrostatic recording apparatus or the like, an electric or magnetic latent image is visualized by toner. For example, in electrophotography, an electrostatic charge image (latent image) is formed on a photoconductor by various methods, and then the latent image is developed with toner to form a toner image. The toner image is transferred onto a transfer material such as paper, if necessary, and then fixed onto the transfer material using various methods such as heating, pressurization, and solvent vapor.

The toner used for electrostatic image development is generally a thermoplastic resin in which a colorant, a charge control agent, an offset preventing agent and the like are melt-kneaded and uniformly dispersed, and then pulverized to obtain a desired toner. It is manufactured by classifying it into particles. According to this manufacturing method (crushing method), it is possible to manufacture a toner having practical properties, but it requires a great equipment cost for crushing and classification, consumes a large amount of energy during crushing, There are many problems such as difficulty in obtaining a toner having a sharp particle size distribution. Therefore, the selection of the toner material is naturally limited.

For example, in a pulverizing method, a resin composition obtained by melt-kneading a thermoplastic resin, a colorant and the like is required to be capable of being pulverized and classified by an economically usable apparatus. Therefore, the melt-kneaded resin composition is required to be sufficiently brittle and easy to pulverize. However, when a sufficiently brittle resin composition is pulverized, toner particles having an extremely wide particle size distribution are produced. In order to obtain a copied image with good resolution and gradation, a large amount of fine powder and coarse powder must be removed from the pulverized product by classification, resulting in a very low yield.

In recent years, a toner having a sharp particle size distribution or a toner having a small particle size has been demanded in order to achieve full color, high definition and high quality of a copied image. However, it is extremely difficult to produce a toner having a sharper particle size distribution than the conventional method by the pulverization method. Further, in order to produce a toner having a small particle size by a pulverization method, a large amount of energy is required at the time of pulverization, and a large amount of ultrafine particles are generated, so that the toner particle size distribution becomes too broad. There's a problem. These ultrafine particles hinder the improvement of the quality of the copied image, but it is difficult to remove them by classification.

In order to solve the problems associated with these pulverization methods, a method of directly producing a toner having a sharp particle size distribution (polymerized toner particles) by suspension polymerization has been proposed. In this suspension polymerization method, a polymerizable monomer composition in which a polymerizable monomer, a colorant, a charge control agent, an offset inhibitor, a polymerization initiator and the like are uniformly dissolved or dispersed, and a dispersion stabilizer are contained. Water or an aqueous dispersion medium containing water as a main component, dispersed using a mixing device having a high shearing force, granulated, and then subjected to suspension polymerization of the granulated polymerizable monomer composition. To produce polymerized toner particles.

According to this suspension polymerization method, the melt-kneading step and the crushing step in the crushing method can be omitted. However, in the conventional suspension polymerization method, (1) it is difficult to granulate to a desired particle size in the granulating step of the polymerizable monomer composition, and (2) the generated polymerized toner particles It is difficult to obtain a toner having a wide particle size distribution and a uniform and sharp particle size distribution. (3) Dispersion stability is achieved because the polymerizable monomer composition is uniformly and finely dispersed in an aqueous dispersion medium. When the amount of the agent used is increased, the dispersion stabilizer remains in the polymerized toner particles, resulting in deterioration of image quality.

That is, in the suspension polymerization method, a polymerizable monomer and a colorant are uniformly stirred and mixed to prepare a polymerizable monomer composition, and then the polymerizable monomer composition is dispersed. It is put in a medium, stirred and mixed to form fine particles. However, it is extremely difficult to granulate a liquid polymerizable monomer into fine particles having a desired particle size in a liquid dispersion medium. The polymerized toner particles produced by suspension polymerization have a broad particle size distribution and thus require a classification step, but the yield is low and the productivity is poor. Moreover, in the pulverization method, the fine particles and coarse particles removed in the classification step are mixed again with the raw material,
While it can be reused after the kneading, pulverizing and classifying steps, it is difficult to reuse the polymerized toner particles removed in the classifying step in the suspension polymerization method.

Further, in the suspension polymerization method, the polymerizable monomer composition is granulated and polymerized in water or an aqueous dispersion medium containing water as a main component. Dispersion stabilizers have been used to stabilize the dispersion of body composition particles. As the dispersion stabilizer, there are generally a water-soluble polymer that forms a protective colloid film and exhibits a repulsive force due to steric hindrance, and a poorly water-soluble inorganic substance. As the water-soluble polymer, polyvinyl alcohol, methyl cellulose,
Gelatin and the like are known. As the poorly water-soluble inorganic substance, poorly water-soluble salts such as calcium phosphate, barium sulfate, calcium sulfate, barium carbonate, calcium carbonate, and magnesium carbonate; inorganic polymer substances such as talc and silicic acid;
Known are metal oxides such as aluminum oxide and titanium oxide; metal hydroxides such as aluminum hydroxide and ferric hydroxide.

However, since these dispersion stabilizers have strong hydrophilicity, if they remain on the surface of the polymerized toner particles, the electrical properties of the toner, such as electric resistance and chargeability, are mainly deteriorated. Therefore, when the polymerized toner particles in which a large amount of the dispersion stabilizer remains are used, the developing performance and the transfer efficiency decrease. Furthermore, the copy density is lowered, the resolution is lowered, the fog is increased, and the practical performance of the toner is impaired. When the amount of the dispersion stabilizer used is reduced, the particle size of the polymerizable monomer composition particles becomes coarse and the particle size distribution becomes broad.

In the conventional method for producing polymerized toner particles by the suspension polymerization method, the above-mentioned problems are overcome,
Several proposals have been made as a method for efficiently forming particles having a sharp particle size distribution. For example, JP-A-63
No. -113561 discloses a pressurizing step of pressurizing a dispersion liquid comprising a powder dispersant and a dispersion medium, and discharging the pressurized dispersion liquid to a low pressure part to disperse the powder dispersant well and then polymerizing the dispersion liquid. Disclosed is a method for producing a polymerized toner, which comprises the step of adding a polymerizable monomer mixture to the dispersion and granulating the mixture. In the method described in the publication, a usual high shear stirring device such as a TK homomixer (made by Tokushu Kika Kogyo) is used in the granulation step.

In Japanese Patent Application Laid-Open No. 63-165869, the polymerizable monomer composition is dispersed in a liquid dispersion medium containing a dispersion stabilizer for granulation, and it is placed in a granulation container. A method for producing a toner for electrostatic charge development, which is granulated using the above high shearing force stirring device, is disclosed. In the method described in this publication, two TK homomixers (manufactured by Tokushu Kika Kogyo), which are turbine type agitators, are used in the granulation step.

In Japanese Patent Laid-Open No. 32-32363, a polymerizable monomer composition is predispersed in an aqueous medium, and then, in a granulation step, the dispersion liquid is formed into one or more comb-shaped concentric rings. A method of flowing a gap between a rotor and a stator from the inside of the rotor toward the outside of the stator is disclosed. In the method described in this publication, the dispersion liquid containing the polymerizable monomer composition is actually supplied to a high-efficiency disperser Ebara Milder (manufactured by EBARA CORPORATION) for granulation.

However, according to the results of studies by the present inventors, all the methods disclosed in these publications are still effective in obtaining polymerized toner particles having a desired particle size and a sharp particle size distribution. Not enough. Therefore, even if a relatively small amount of the dispersion stabilizer is used, the polymerizable monomer composition particles having a small particle size and a sharp particle size distribution are efficiently produced in the aqueous dispersion medium in the granulation step. Therefore, there is a demand for a new manufacturing method capable of obtaining polymerized toner particles having a desired particle size and a sharp particle size distribution by suspension polymerization.

[0015]

An object of the present invention is to easily control the particle size (volume average particle size) by the suspension polymerization method,
Moreover, it is an object of the present invention to provide a method for producing a toner for developing an electrostatic charge image, which can efficiently and stably produce polymerized toner particles having a sharp particle size distribution (volume average particle size / number average particle size). In particular, an object of the present invention is to provide a method for producing a toner for developing an electrostatic charge image, which is capable of producing a toner having a small particle diameter and an extremely sharp particle diameter distribution by a suspension polymerization method. . Another object of the present invention is to provide a method for producing a toner for developing an electrostatic charge image, which has an extremely sharp particle size distribution of toner, has good electric properties, and has excellent image quality characteristics.

The inventors of the present invention have conducted extensive studies to overcome various problems in the method for producing a toner for developing an electrostatic charge image by the suspension polymerization method, and as a result, in the granulation step, the polymerizable monomer composition was used. , In an aqueous dispersion medium containing a dispersion stabilizer, by granulating by the action of a shearing force generated by a rotor rotating at high speed and a screen surrounding it, collision force, pressure fluctuation, cavitation, and a potential core, The inventors have found that it is possible to efficiently and stably produce polymerized toner particles having an extremely sharp particle size distribution, even if the average particle size is easily controlled, and based on the findings, the present invention is completed. Came to.

[0017]

Thus, according to the present invention, a polymerizable monomer composition containing at least a polymerizable monomer and a colorant in an aqueous dispersion medium containing a dispersion stabilizer, Granulation is carried out by the action of shearing force, collision force, pressure fluctuation, cavitation, and potential core generated by a rotor rotating at a high speed and a screen surrounding it, and then suspension polymerization of the granulated polymerizable monomer composition. A polymerized toner particle is formed to provide a method for producing a toner for developing an electrostatic charge image.

The following (1) and (2) are provided as preferred embodiments of the present invention. (1) The rotor is a stirring blade that rotates at 4,500 to 21,500 rpm, the surrounding screen is a fixed ring provided with a number of slits, and the gap between the rotor and the screen is 0. .1-1.3m
The manufacturing method according to claim 1, wherein m is m. (2) The volume average particle diameter of the generated polymerized toner particles is 2 to 2
0 μm, preferably 4 to 10 μm, and the particle size distribution (volume average particle size / number average particle size) of 1.6 or less.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
In the manufacturing method of the present invention, first, a polymerizable monomer composition containing at least a polymerizable monomer and a colorant is prepared. Therefore, the polymerizable monomer, the colorant, the charge control agent, the offset inhibitor, the polymerization initiator and the like are uniformly dissolved or dispersed using a mixer having a high shearing force. On the other hand, an aqueous dispersion medium containing a dispersion stabilizer is prepared. The polymerizable monomer composition is put into an aqueous dispersion medium containing a dispersion stabilizer, and usually 1 to 1 with a stirrer such as a propeller stirrer.
Preliminarily disperse by stirring for about 60 minutes. Next, the predispersed dispersion is supplied to a disperser equipped with a rotor capable of rotating at high speed and a screen surrounding the rotor using a liquid feeding means such as a pump.

In the production method of the present invention, an apparatus capable of granulating by the action of shearing force, collision force, pressure fluctuation, cavitation, and potential core generated by a rotor rotating at a high speed and a screen surrounding it is as follows: A disperser such as CLEARMIX manufactured by M Technique Co., Ltd. may be mentioned.

The CLEARMIX has a structure in which a rotor rotating the liquid to be treated at a high speed and a fixed screen surrounding the rotor generate shearing force, collision force, pressure fluctuation, cavitation, and potential core action. Therefore, it is possible to emulsify and disperse by these synergistic effects. That is, CLEARMIX is generally used for the production of emulsions, but the present inventors have found that this apparatus disperses the polymerizable monomer composition in the method for producing polymerized toner particles by the suspension polymerization method. It has been found that it is effective as a granulating device for dispersing and suspending in an aqueous dispersion medium containing a stabilizer to form fine particles.

With reference to FIG. 1 and FIG. 2, a case where CLEARMIX manufactured by M Technique Co., Ltd. is used as a granulating apparatus will be described as an example. In FIG. 1, a rotor 1 is a stirring blade that can normally rotate at a rotation speed of 4,500 to 21,500 rpm, and a screen 2 surrounding it is a stationary ring provided with a large number of slits. The clearance (clearance) between the rotor 1 and the screen 2 is usually 0.1 to 1.3 mm. The above-mentioned dispersion liquid (preliminary mixed liquid) prepared by preliminarily dispersing the polymerizable monomer composition in an aqueous dispersion medium is From the premixed liquid inlet 4 shown in FIG. 2, it is supplied into the zone of the rotor 1 and the screen 2. The rotor 1 and the screen 2 are, for example, about 500c
It is surrounded by a pot (pressurized vacuum attachment) 3 of c and is provided with a temperature sensor 6, a cooling jacket 7, and a cooling coil 8. Mechanical energy is applied by the rotor 1 and the screen 2 which rotate at high speed, and the polymerizable monomer composition in the dispersion is granulated.

That is, the dispersion liquid supplied to the zone formed by the rotor 1 and the screen 2 is subjected to shearing force, collision force, pressure fluctuation, cavitation due to the rotor 1 rotating at a high speed and the fixed screen 2 surrounding the rotor 1. , And the action of the potentiometer core, it is ejected from the gap (slit) of the screen 2 into the pot 3. Due to the synergistic effect of these actions, droplets (polymerizable monomer composition particles) having a small particle size and a sharp particle size distribution are formed. The dispersion liquid containing the polymerizable monomer composition particles is sent from the outlet (dispersion, suspension outlet) 5 to the next polymerization step.

The mechanism by which the polymerizable monomer composition is atomized in the dispersion liquid by the rotor 1 rotating at a high speed and the fixed screen 2 surrounding the rotor 1 has the following effects. A large velocity gradient exists near the surface of the rotor (stirring blade) that rotates at a high speed, forming a high shear velocity region. The dispersion liquid subjected to the shearing force is atomized. A vacuum portion (cavitation) is generated behind the blade rotating in the liquid. The bubbles thus generated are destroyed when the flow velocity decreases and the pressure rises. At this time, the bubbles are compressed to generate an impact pressure in the bubbles, and the impact causes atomization. The kinetic energy increases when the pressure energy applied to the dispersion by the rotor rotating at high speed is suddenly released. The dispersion consists of a rotor and a stationary ring (screen) surrounding it.
When repeatedly passing through the open part (slit) and closed part of
A pressure wave is generated. By these, atomization is performed.
Atomization occurs when the dispersion, which has high kinetic energy, strikes the screen and other walls. When the dispersion liquid having velocity energy passes through the slit portion of the screen, it becomes a jet flow. Potential core in jet (velocity region not affected by viscosity)
In, the surrounding fluid is sucked at a high speed, and very high energy is given to atomize the fluid. In fact, due to the synergistic effect of these actions, it is presumed that granulation with a sharp particle size distribution is performed even with a small particle size.

In the granulation process using a rotor rotating at high speed and a fixed screen surrounding the rotor, it is preferable to increase the rotation speed of the rotor in order to reduce the particle size and sharpen the particle size distribution. The rotation speed of the rotor is usually 4,500 to 21,500 rpm, preferably 10,000 to 21,500 rpm, and more preferably 15,000 to 21,000 rpm. The rotation speed is
It is the measured display value by the rotation sensor. Prolonging the treatment time (residence time in the case of a continuous system) is preferable in order to reduce the particle size and sharpen the particle size distribution. The treatment time is usually 10 to 300 seconds, preferably 30 to 250.
Seconds, more preferably 50-240 seconds. The clearance between the rotor and the screen is generally
It is 0.1 to 1.3 mm, preferably about 0.2 to 1.0 mm.

The particle size and particle size distribution of the polymerized toner particles can also be adjusted by selecting the shapes of the rotor and screen. Specifically, for example, rotors R1 to R4 used for CLEARMIX manufactured by M Technique Co., Ltd., and a screen S1.0-24,
S1.5-24, S1.5-18, S2.0-18, S
Standard equipment such as 3.0-9 can be used in combination, but it is also possible to make a desired shape by itself.

The particle size and particle size distribution of the polymerized toner particles include the type and amount of the dispersion stabilizer, the ratio of the polymerizable monomer composition to the aqueous dispersion medium containing the dispersion stabilizer, and the viscosity of the aqueous dispersion medium. It can also be adjusted by adjusting etc. For example, the ratio of the polymerizable monomer composition and the aqueous dispersion medium containing the dispersion stabilizer is set so that the polymerizable monomer composition in the system is taken into consideration in consideration of the ease of granulation and the dispersion stability of the particles during the polymerization reaction. The concentration of the monomer composition is 5 to 50% by weight, preferably 10 to 4
The range is preferably 0% by weight, more preferably about 20 to 35% by weight.

The polymerizable monomer used in the present invention includes
For example, aromatic vinyl monomers such as styrene, α-methylstyrene, p-methylstyrene and p-chlorostyrene; unsaturated nitriles such as acrylonitrile; methyl (meth) acrylate, ethyl (meth) acrylate,
Butyl (meth) acrylate, ethylhexyl (meth)
Examples thereof include unsaturated (meth) acrylic acid esters such as acrylate, lauryl (meth) acrylate, and stearyl (meth) acrylate; conjugated diolefins such as butadiene and isoprene. These polymerizable monomers can be used alone or in combination of two or more kinds.

Examples of the colorant used in the present invention include carbon black, titanium white, nigrosine base, aniline blue, chalco oil blue, chrome yellow, ultramarine blue, orient oil red, phthalocyanine blue, malachite green oxalate and the like. And magnetic particles of cobalt, nickel, iron sesquioxide, ferrosoferric oxide, manganese oxide, zinc oxide, nickel oxide, and the like;

For magnetic color toner, for example,
C. I. Direct Red 1, C.I. I. Direct Red 4, C.I. I. Acid Red 1, C.I. I. Basic Red 1, C.I. I. Mordant Red 30, C.I. I. Direct Blue 1, C.I. I. Direct Blue 2, C.I.
I. Acid Blue 9, C.I. I. Acid Blue 15,
C. I. Basic Blue 3, C.I. I. Basic Blue 5, C.I. I. Mordant Blue 7, C.I. I. Direct Green 6, C.I. I. Basic Green 4, C.I.
I. There are Basic Green 6 etc. As pigments, yellow lead, cadmium yellow, mineral fast yellow,
Navel Yellow, Naphthol Yellow S, Hansa Yellow G, Permanent Yellow NCG, Tartrazine Lake, Red Mouth Lead, Molybdenum Orange, Permanent Orange GTR, Pyrazolone Orange, Benzidine Orange G, Cadmium Red, Permanent Red 4R, Watching Red Calcium Salt, Eosin Lake, Brilliant Carmine 3B, Manganese Purple, Fast Violet B, Methyl Violet Lake, Navy Blue, Cobalt Blue, Alkali Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Fast Sky Blue,
Indanthrene blue BC, chrome green, chrome oxide, pigment green B, malachite green rake, final yellow green G and the like.

Examples of the two-component full-color toner include the following. Examples of magenta color pigments include C.I. I. Pigment Red 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11, 12, 13, 14, 1
5, 16, 17, 18, 19, 21, 22, 23, 3
0, 31, 32, 37, 38, 39, 40, 41, 4
8, 49, 50, 51, 52, 53, 54, 55, 5
7, 58, 60, 63, 64, 68, 81, 83, 8
7, 88, 89, 90, 112, 114, 122, 12
3, 163, 202, 206, 207, 209, C.I.
I. Pigment violet 19, C.I. I. Butred 1,2,10,13,15,23,29,35 etc. are mentioned.

Examples of magenta dyes include C.I. I. Solvent Red 1, 3, 8, 23, 24, 25, 27, 3
0, 49, 81, 82, 83, 84, 100, 109,
121, C.I. I. Disperse Red 9, C.I. I. Solvent Violet 8, 13, 14, 21, 27, C.I.
I. Oil soluble dyes such as Disperse Violet 1; C.I.
I. Basic Red 1, 2, 9, 12, 13, 14,
15, 17, 18, 22, 23, 24, 27, 29, 3
2, 34, 35, 36, 37, 38, 39, 40, C.I.
I. Basic Violet 1, 3, 7, 10, 14,
Basic dyes such as 15, 21, 25, 26, 27, 28;
Is mentioned.

As the color pigment for cyan, C.I. I. Pigment Blue 2, 3, 15, 16, 17, C.I. I. Bat Blue 6, C.I. I. Examples include Acid Blue 45 and a copper phthalocyanine pigment having 1 to 5 phthalimidomethyl groups substituted on the phthalocyanine skeleton. Examples of coloring pigments for yellow include C.I. I. Pigment Yellow 1, 2,
3, 4, 5, 6, 7, 10, 11, 12, 13, 14,
15, 16, 17, 23, 65, 73, 83, 138,
C. I. Butt Yellow 1, 3, 20, and the like.
The dyes and pigments are generally used in a proportion of 0.1 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the polymerizable monomer. The magnetic particles are usually used in an amount of 1 to 100 parts by weight, preferably 5 parts by weight, based on 100 parts by weight of the polymerizable monomer.
It is used in a proportion of 50 parts by weight.

If desired, an oil-soluble polymerization initiator, a molecular weight modifier, a crosslinkable monomer, a release agent, and a charge control agent can be added to the polymerizable monomer composition. Any oil-soluble polymerization initiator may be used as long as it is soluble in the monomer used, and examples thereof include methyl ethyl peroxide, di-t-butyl peroxide, acetyl peroxide, dicumyl peroxide and lauroyl peroxide. Oxide, benzoyl peroxide, t-butyl peroxy-2-ethylhexanoate, di-isopropyl peroxydicarbonate,
Peroxides such as di-t-butyldiperoxyisophthalate; 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobisisobutyronitrile,
Azo compounds such as 1,1′-azubis (1-cyclohexanecarbonitrile); and the like. The oil-soluble polymerization initiator is usually used in a proportion of 0.1 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the polymerizable monomer. The polymerization initiator can be added in advance to the polymerizable monomer composition, but in some cases, it can be added to the suspension after the completion of the granulation step.

Examples of the molecular weight modifier include mercaptans such as t-dodecyl mercaptan, n-dodecyl mercaptan and n-octyl mercaptan; carbon tetrachloride,
Halogenated hydrocarbons such as carbon tetrabromide; and the like. These molecular weight modifiers can be added before the initiation of polymerization or during the polymerization. The molecular weight adjusting agent is usually added to 100 parts by weight of the polymerizable monomer.
It is used in a proportion of 0.01 to 10 parts by weight, preferably 0.1 to 5 parts by weight.

Examples of the crosslinkable monomer include polyfunctional monomers such as divinylbenzene, ethylene glycol di (meth) acrylate, glycidyl (meth) acrylate and trimethylolpropane tri (meth) acrylate. You can These crosslinkable monomers can be added before the start of the polymerization or during the polymerization. The crosslinkable monomer is usually 0.01 to 10 parts by weight, preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the polymerizable monomer.
It is used in a ratio of 5 parts by weight. As the release agent, for example, low molecular weight polyethylene, low molecular weight polypropylene,
Low molecular weight polyolefins such as low molecular weight polybutylene,
And waxes. The release agent is usually used in a proportion of 0.1 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the polymerizable monomer.

The charge control agent is preferably contained in the polymerizable monomer composition in order to improve the chargeability of the resulting toner. As the charge control agent, various charge control agents having positive or negative chargeability can be used. As the charge control agent, for example, nigrosine N01 (manufactured by Orient Chemical Co., Ltd.), nigrosine EX (manufactured by Orient Chemical Co., Ltd.), Spiroblack TRH (manufactured by Hodogaya Chemical Co., Ltd.), T
-77 (manufactured by Hodogaya Chemical Co., Ltd.), Bontron S-34 (manufactured by Orient Chemical Company), Bontron E-81 (manufactured by Orient Chemical Company), Bontron E-84 (manufactured by Orient Chemical Company), Bontron E-89 (Orient Chemical Company). Made), Bontron F-21 (made by Orient Chemical Company), COPY
CHRGE NX UP434 (Hoechst Industry Co., Ltd.), COPY CHRGE NEG UP203
6 (manufactured by Hoechst Industry Co., Ltd.), TNS-4-1
(Hodogaya Chemical Co., Ltd.), TNS-4-2 (Hodogaya Chemical Co., Ltd.), LR-147 (Nihon Carlit Co., Ltd.), and the like. The charge control agent is generally used in an amount of 0.01 to 10 parts by weight, preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the polymerizable monomer.

Further, for the purpose of uniformly dispersing the colorant in the toner particles, a lubricant such as oleic acid and stearic acid; a dispersion aid such as a silane-based or titanium-based coupling agent; a polar group-containing polymer dispersion aid. Agent; etc. may be present in the polymerizable monomer composition. Such lubricants and dispersion aids are usually 1 / 1000-based on the weight of the colorant.
It is used at a ratio of about 1/50.

In the present invention, water or an aqueous liquid containing water as a main component can be used as the aqueous dispersion medium. Examples of the dispersion stabilizer include water-soluble polymers such as polyvinyl alcohol, methyl cellulose and gelatin; sparingly water-soluble salts such as calcium phosphate, barium sulfate, calcium sulfate, barium carbonate, calcium carbonate and magnesium carbonate; Examples thereof include molecular substances; metal oxides such as aluminum oxide and titanium oxide; metal hydroxides such as aluminum hydroxide, magnesium hydroxide and ferric hydroxide. The dispersion stabilizers can be used alone or in combination of two or more kinds. The dispersion stabilizer is generally used in an amount of 0.1 to 20 parts by weight, preferably 0.5 to 18 parts by weight, based on 100 parts by weight of the aqueous dispersion medium.

In the present invention, the ratio of the polymerizable monomer composition and the aqueous dispersion medium is not particularly limited, but the ease of granulation in the dispersion medium and the dispersion stability of the particles during the polymerization reaction are determined. Considering this, the concentration of the polymerizable monomer composition in the system is usually in the range of 5 to 50% by weight, preferably 10 to 40% by weight, and more preferably 20 to 35% by weight.

After the granulating step, the granulated polymerizable monomer composition is suspension-polymerized by a conventional method to form polymerized toner particles. After the suspension polymerization reaction is completed, the dispersion stabilizer remaining on the surface of the particles is removed by normal pickling and washing with water, followed by dehydration and drying to obtain polymerized toner particles. According to the method of the present invention, in the method for producing a toner by the suspension polymerization method, compared with the case where the granulation is performed using various high shearing force stirring devices that have been generally used as a granulating device from the past, Even if the amount of the dispersion stabilizer used is relatively small, polymerized toner particles having a small particle size and a sharp particle size distribution can be obtained. According to the production method of the present invention, a polymerized toner particle having a volume average particle diameter of 2 to 20 μm and a sharp particle diameter distribution with a particle diameter distribution (ratio of volume average particle diameter / number average particle diameter) of 1.6 or less. Can be obtained. In addition,
The method of the present invention can be applied to a capsule toner having a low temperature fixing property.

[0042]

The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples. Parts and% in Examples and Comparative Examples are based on weight unless otherwise specified.

Example 1 Styrene 70 parts n-Butylmethacrylate 30 parts Carbon black (Printex 150T, manufactured by Degussa) 5 parts Charge control agent 1 part (Spiron Black TRH, Hodogaya Chemical Co., Ltd.) Divinylbenzene 1 part 2,2'-azobisisobutyronitrile 2 parts The above components are stirred and mixed at a rotation speed of 6000 rpm by a TK homomixer (manufactured by Tokushu Kika Co., Ltd.), which is a mixer having a high shearing force, and uniformly mixed. A dispersed polymerizable monomer composition was prepared.

On the other hand, 2.5 parts of polyvinyl alcohol (GH-23, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was dissolved in 250 parts of ion-exchanged water to prepare a dispersion stabilizer-containing aqueous solution. The above polymerizable monomer composition was added to this polyvinyl alcohol dispersion stabilizer-containing aqueous solution, and the mixture was stirred and mixed using a propeller stirrer. 500cc pressurized vacuum attachment, rotor (R-2), and screen (S-1.0-2)
4) is attached (the gap between the rotor and the screen is 0.2
mm) and a granulating apparatus (Clearmix CLM-0.8S: manufactured by M Technic Co., Ltd.) operating at a rotor rotation speed of 21,000 rpm, using a pump, the mixed solution obtained above at 30 kg / Hr. Was supplied at a flow rate of. Thus, the continuous treatment was performed to granulate the droplets (particles) of the polymerizable monomer composition. Then, the aqueous dispersion containing the granulated polymerizable monomer composition was placed in a reactor equipped with a stirring blade, and 6
Polymerization reaction was carried out by stirring at 5 ° C. for 8 hours to obtain an aqueous dispersion of a polymer (polymerized toner particles).

After the completion of the polymerization reaction, the particle diameter of the obtained polymerized toner particles was measured by a Coulter counter (manufactured by Nikkaki Co., Ltd.), and the volume average particle diameter (dv) was 8.2 μm. The ratio (dv / dp) of the volume average particle diameter (dv) to the number average particle diameter (dp) was 1.30. In this Coulter Counter measurement,
The parameters shown below were used. Aperture diameter: 100 μm Medium: Isoton II Concentration: 15% Number of measured particles: 50,000

Next, the aqueous dispersion of the polymer obtained as described above is filtered to separate water, 500 parts of ion-exchanged water is newly added, the mixture is heated to 50 ° C., reslurried, and water is added for 10 minutes. It was washed. This washing with water was repeated 5 times to separate the solid content by filtration, and then dried at 50 ° C. for one day in a dryer to obtain polymerized toner particles. 0.5 parts of hydrophobized colloidal silica (trade name: R-202, manufactured by Nippon Aerosil Co., Ltd.) was added to the polymerized toner particles (100 parts) obtained above, and a Henschel mixer (manufactured by Mitsui Miike Co., Ltd.) was added. Toner was prepared by mixing. Using the toner obtained above, a commercially available non-magnetic one-component developing type printer (OL-400E manufactured by Oki Electric Co., Ltd.)
Image evaluation was carried out in an environment of a normal temperature and normal humidity of a temperature of 23 ° C. and a humidity of 50%. As a result, an image having a high image density and having excellent resolution without fog or unevenness was obtained. Further, when the same image evaluation was performed in a high temperature and high humidity environment of a temperature of 35 ° C. and a humidity of 85%, a good image was obtained as in the normal temperature and normal humidity environment.

Example 2 A polymerizable monomer was prepared in the same manner as in Example 1 except that 3 parts of calcium phosphate was used as the dispersion stabilizer instead of 2.5 parts of polyvinyl alcohol. Granulate and polymerize the composition,
A polymer (polymerized toner particles) was obtained. The volume average particle size of the obtained polymerized toner particles is 7.7 μm, and the particle size distribution (d
v / dp) was 1.25. While stirring the aqueous dispersion of the polymer obtained above, hydrochloric acid was added to adjust the pH of the system to 4 or less, acid washing was performed (25 ° C., 10 minutes), and water was separated by filtration, and then a new ion was added. 500 parts of exchanged water was added to form a reslurry, and water washing (10 minutes at 25 ° C.) was performed. This washing with water was repeated 5 times to separate solids by filtration, and then dried at 50 ° C. for one day in a dryer to obtain polymerized toner particles. Example 1 was added to the polymerized toner particles.
A toner was prepared by mixing hydrophobized colloidal silica in the same manner as in. Using this toner, image evaluation was performed in the same manner as in Example 1. As a result, a clear image with high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Example 3] Granulation and polymerization reaction of the polymerizable monomer composition were carried out in the same manner as in Example 2 except that the amount of calcium phosphate as the dispersion stabilizer was changed to 4 parts. Further, acid washing, water washing and drying were carried out to obtain a polymer (polymerized toner particles). The volume average particle size of the obtained polymerized toner particles was 5.8 μm, and the particle size distribution (dv / dp) was 1.28. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was performed in the same manner as in Example 1. As a result, a clear image with high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Example 4] A polymerizable monomer was prepared in the same manner as in Example 1 except that 3 parts of magnesium hydroxide was used as the dispersion stabilizer instead of 2.5 parts of polyvinyl alcohol. The polymer composition was obtained by granulating and polymerizing the monomer composition. While stirring the aqueous dispersion of the polymer obtained above, sulfuric acid was added to adjust the pH of the system to 4 or less and acid washing was performed (25 ° C. for 10 minutes). 500 parts of exchanged water was added to form a reslurry, and water washing (10 minutes at 25 ° C.) was performed. This washing with water was repeated 5 times to separate the solid content by filtration, and then the product was dried at 50 ° C. for a whole day and night to obtain polymerized toner particles. The volume average particle size of the obtained polymerized toner particles is 7.3 μm, and the particle size distribution (dv / dp) is 1.22.
Met. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was performed in the same manner as in Example 1. As a result, a clear image with high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Example 5] In Example 4, the polymerizable monomer composition was added to the aqueous solution containing the magnesium hydroxide dispersion stabilizer, and the mixture was stirred and mixed using a propeller stirrer.
2 kg of the obtained mixed solution was put into a 3 liter stainless beaker, and a Clearmix CLM equipped with a rotor (R-2) and a screen (S-1.0-24) was installed.
Using -0.8S (manufactured by M Technique Co., Ltd.), a granulation process was performed at a rotor rotation speed of 21000 rpm. By performing batch processing as described above, droplets (particles) of the polymerizable monomer composition were granulated. This granulated aqueous dispersion of the polymerizable monomer composition was placed in a reactor equipped with a stirring blade and stirred at 65 ° C. for 8 hours to carry out a polymerization reaction to obtain an aqueous solution of the polymer (polymerized toner particles). A dispersion was obtained. The aqueous dispersion of the polymer thus obtained was washed with acid, washed with water and dried in the same manner as in Example 4 to obtain polymerized toner particles. The volume average particle size of the obtained polymerized toner particles is 7.6 μm, and the particle size distribution (dv /
dp) was 1.25. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, Example 1
When an image was evaluated in the same manner as in, a clear image with high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Embodiment 6] In Embodiment 4, the rotation speed of the CLEARMIX CLM-0.8S rotor is 15,0.
Granulation and polymerization reaction of the polymerizable monomer composition were performed in the same manner as in Example 4 except that the speed was changed to 00 rpm, and further, acid washing, water washing, and drying were performed to obtain a polymer (polymerized toner particles). It was The volume average particle size of the obtained toner particles is 7.6 μm.
The particle size distribution (dv / dp) was 1.28.
A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was performed in the same manner as in Example 1. As a result, a clear image with high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Embodiment 7] In Embodiment 4, the screen of CLEARMIX CLM-0.8S is changed to S-1.5-2.
A polymerizable monomer composition was granulated and polymerized in the same manner as in Example 4 except that No. 4, and then acid washing, water washing, and drying were performed to obtain a polymer (polymerized toner particles). . The volume average particle size of the obtained polymerized toner particles was 7.5 μm, and the particle size distribution (dv / dp) was 1.27. Toner was prepared by mixing the above toner particles with hydrophobized colloidal silica in the same manner as in Example 1. Using this toner, image evaluation was performed in the same manner as in Example 1. As a result, a clear image with high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

Example 8 Example 4 was repeated except that the flow rate of the mixed solution of the magnesium hydroxide dispersant-containing aqueous solution and the polymerizable monomer composition was changed to 50 kg / Hr.
The polymerizable monomer composition was granulated and polymerized in the same manner as above, and further washed with acid, washed with water and dried to obtain a polymer (polymerized toner particles). The volume average particle size of the obtained polymerized toner particles is 7.8 μm, and its particle size distribution (dv / d
p) was 1.30. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was performed in the same manner as in Example 1. As a result, a clear image with high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Example 9] Granulation and polymerization of the polymerizable monomer composition in the same manner as in Example 4 except that the amount of magnesium hydroxide as the dispersion stabilizer was changed to 5 parts. A reaction was performed to obtain a polymer. While stirring the aqueous dispersion of the polymer obtained above, sulfuric acid was added to adjust the pH of the system to 4 or less and acid washing was performed (25 ° C. for 10 minutes). 500 parts of exchanged water was added to form a reslurry, and water washing (10 minutes at 25 ° C.) was performed. This washing with water was repeated 5 times to separate the solid content by filtration, and then dried at 50 ° C. for a whole day and night to obtain a polymerized toner. The volume average particle size of the obtained polymerized toner particles is 5.1 μm, and the particle size distribution (dv / dp) is 1.2.
It was 5. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was carried out in the same manner as in Example 1. As a result, a clear image having high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Example 10] In Example 9, carbon black as a colorant and Printex 150T were used as an organic pigment yellow # 151 (manufactured by Resino Color Industry Co., Ltd.).
Parts and charge control agent Spyron Black TRH as 1 part of Bontron E-84 (manufactured by Orient Chemical Industry Co., Ltd.),
Further, the granulation and polymerization reaction of the polymerizable monomer composition were carried out in the same manner as in Example 9 except that 0.5 part of the dispersion aid for organic pigments Solspers S24000 (manufactured by Zeneca Corporation) was used. Got While stirring the aqueous dispersion of the polymer obtained above, sulfuric acid was added to adjust the pH of the system to 4 or less and acid washing was performed (25 ° C. for 10 minutes). 500 parts of exchanged water was added to form a reslurry, and water washing (10 minutes at 25 ° C.) was performed. This washing with water was repeated 5 times to separate the solid content by filtration, and then dried at 50 ° C. for a whole day and night to obtain a polymerized toner. The volume average particle diameter of the obtained polymerized toner particles is 5.
The particle size distribution (dv / dp) was 1.23 at 5 μm. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was carried out in the same manner as in Example 1. As a result, a clear image having high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

Example 11 In Example 9, carbon black as a coloring agent, 5 parts of Printex 150T as an organic pigment cyan GNX (manufactured by Sumika Color Co., Ltd.) and Bontron E-84 as a charge control agent Spyron Black TRH were used.
Polymerizable monomer composition in the same manner as in Example 9 except that 1 part (manufactured by Orient Chemical Industry Co., Ltd.) and 0.5 part of Solspers S24000 (manufactured by Zeneca Co.), a dispersion aid for organic pigments, were used. The product was granulated and polymerized to obtain a polymer. While stirring the aqueous dispersion of the polymer obtained above, sulfuric acid was added to adjust the pH of the system to 4 or less and acid washing was performed (25 ° C. for 10 minutes). 500 parts of exchanged water was added to form a reslurry, and water washing (10 minutes at 25 ° C.) was performed. This washing with water was repeated 5 times to separate the solid content by filtration, and then dried at 50 ° C. for a whole day and night to obtain a polymerized toner.
The volume average particle diameter of the obtained polymerized toner particles is 5.2 μm.
The particle size distribution (dv / dp) was 1.27.
A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was carried out in the same manner as in Example 1. As a result, a clear image having high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Example 12] In Example 9, carbon black as a colorant, 5 parts of Printex 150T as an organic pigment KET RED 309 (manufactured by Dainippon Ink and Chemicals Co., Ltd.) and Bontron E- as a charge control agent Spylon Black TRH were used. 84 (manufactured by Orient Chemical Industry Co., Ltd.), 1 part, and further an organic pigment dispersion aid Solspers S2400.
A polymer was obtained by granulating and polymerizing the polymerizable monomer composition in the same manner as in Example 9 except that the amount was 0 (manufactured by Zeneca Corporation) 0.5 part. While stirring the aqueous dispersion of the polymer obtained above, sulfuric acid was added to adjust the pH of the system to 4 or less and acid washing was performed (25 ° C. for 10 minutes). 500 parts of exchanged water was added to form a reslurry, and water washing (10 minutes at 25 ° C.) was performed. This washing with water was repeated 5 times to separate the solid content by filtration, and then dried at 50 ° C. for a whole day and night to obtain a polymerized toner. The volume average particle size of the obtained polymerized toner particles is 5.0 μm, and the particle size distribution (dv / dp) is 1.2.
It was 1. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was carried out in the same manner as in Example 1. As a result, a clear image having high image density and no fog or unevenness was obtained under both normal temperature and normal humidity environment and high temperature and high humidity environment.

[Comparative Example 1] In Example 1, except that a high shear mixer Ebara Milder (manufactured by Ebara Corporation) was used as a granulator for the droplets of the polymer monomer composition. In the same manner as in Example 1, the polymerizable monomer composition was granulated, polymerized, and washed with water to obtain polymerized toner particles. The granulation conditions for the droplets of the polymerizable monomer composition using an Ebara Milder were as follows. That is, the polymerizable monomer composition was added to an aqueous solution containing a polyvinyl alcohol dispersion stabilizer, and the mixture was stirred and mixed using a propeller stirrer. This mixed solution was applied to Ebara Milder MDM303V, the rotation speed of the rotor was 12,000 rpm, and the flow rate was 120 liters / H.
At r, it was repeatedly fed 5 times for treatment. The volume average particle size of the obtained polymerized toner particles was 10.6 μm, and the particle size distribution (dv / dp) was 1.89. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. When this toner was used and image evaluation was performed in the same manner as in Example 1, the image density was low under a normal temperature and normal humidity environment, and only an unclear image with fog and unevenness was obtained. Also, the image was the same as in a normal temperature and normal humidity environment even in a high temperature and high humidity environment.

[Comparative Example 2] In Example 1, except that a TK homomixer (manufactured by Tokushu Kako Co., Ltd.), which is a high-shear mixing device, was used as the granulating device for the droplets of the polymerizable monomer composition. In the same manner as in Example 1, the polymerizable monomer composition was granulated, polymerized, and washed with water to obtain polymerized toner particles. The conditions for granulating the droplets of the polymer composition using the TK homomixer are:
It was as follows. That is, the polymerizable monomer composition was added to a polyvinyl alcohol dispersion stabilizer-containing aqueous solution,
The mixture was stirred and mixed using a propeller stirrer. This mixed solution was rotated with a TK homomixer SL type at a rotation speed of 9000 rp.
m for 10 minutes. The volume average particle size of the obtained polymerized toner particles is 11.8 μm, and its particle size distribution (dv / d
p) was 2.05. As in Example 1, the polymerized toner particles were mixed with hydrophobized colloidal silica to prepare a toner. Using this toner, Example 1
When the image was evaluated in the same manner as in (1), the image density was low in a normal temperature and normal humidity environment, and only an unclear image with fog and unevenness was obtained. Also, the image was the same as in a normal temperature and normal humidity environment even in a high temperature and high humidity environment.

[Comparative Example 3] In Comparative Example 1, the monomer composition was granulated, polymerized, and washed with water in the same manner as in Comparative Example 1 except that the amount of polyvinyl alcohol was changed to 5 parts. Polymerized toner particles were obtained. The volume average particle size of the obtained polymerized toner particles is 8.3 μm, and the particle size distribution (dv / d
p) was 2.17. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. When this toner was used and image evaluation was performed in the same manner as in Example 1, the image density was low under a normal temperature and normal humidity environment, and only an unclear image with fog and unevenness was obtained. Further, in the high temperature and high humidity environment, the image density was lower than that in the high temperature and normal humidity environment, and only an image with much fog and unevenness was obtained.

[Comparative Example 4] In Example 3, except that the droplet granulating apparatus was changed to Ebara Milder.
In the same manner as in Example 3, the polymerizable monomer composition was granulated, polymerized, washed with acid, and washed with water to obtain polymerized toner particles. The conditions for droplet granulation in Ebara Milder are as follows: Comparative Example 1
I went the same way. The volume average particle size of the obtained polymerized toner particles is 9.5 μm, and the particle size distribution (dv / dp) is 1.
It was 91. A toner was prepared by mixing the above-mentioned polymerized toner particles with colloidal silica which was subjected to a hydrophobic treatment in the same manner as in Example 1. Using this toner, image evaluation was carried out in the same manner as in Example 1. As a result, the image density was low in a normal temperature and normal humidity environment.
Only an unclear image with fog and unevenness was obtained.
Further, the image under the high temperature and high humidity environment was the same as that under the high temperature and normal humidity environment.

[0062]

According to the present invention, in the production of electrostatic charge image developing toner by the suspension polymerization method, the shearing force and the collision force generated by the rotor rotating at a high speed in the granulation step and the fixed screen surrounding the rotor. By using a granulator that applies the effects of pressure fluctuation, pressure fluctuation, cavitation, and potential core, it is easier to control the volume average particle size than the conventional granulator, and the particle size is small. Also provided is a manufacturing method capable of efficiently and stably manufacturing a toner having an extremely sharp particle size distribution. According to the production method of the present invention, the volume average particle size of the toner produced is small and the particle size distribution is extremely sharp, even when the amount of the dispersion stabilizer used is small compared to the conventional method. Therefore, it is possible to reduce the amount of the dispersion stabilizer remaining on the surface of the polymerized toner particles. In addition, excellent color toner and capsule toner can be manufactured. As described above, according to the present invention, it is possible to obtain a toner containing a colorant, having an extremely narrow particle size distribution and having excellent image characteristics.

[Brief description of drawings]

FIG. 1 is a schematic view showing a rotor rotating at high speed and a fixed screen surrounding the rotor.

FIG. 2 is a schematic cross-sectional view showing the entire granulating apparatus including a rotor rotating at high speed and a fixed screen surrounding the rotor.

[Explanation of symbols]

 1 Rotor 2 Screen 3 500cc Pot 4 Premixed Liquid Inlet 5 Dispersion / Suspension Outlet 6 Temperature Sensor 7 Cooling Jacket 8 Cooling Coil

Claims (3)

[Claims] 1. A polymerizable monomer composition containing at least a polymerizable monomer and a colorant is produced in an aqueous dispersion medium containing a dispersion stabilizer by a rotor rotating at high speed and a screen surrounding the rotor. Granulating by the action of shearing force, collision force, pressure fluctuation, cavitation, and potential core, and then suspension-polymerizing the granulated polymerizable monomer composition to form polymerized toner particles. A method for producing a toner for developing an electrostatic charge image. 2. The rotor is 4,500 to 21,500 r.
A stirring blade rotating at a rotation speed of pm, a screen surrounding the stirring blade is a fixed ring provided with a large number of slits, and a gap between the rotor and the screen is 0.1 to 10.
The method for producing a toner for developing an electrostatic charge image according to claim 1, having a size of 1.3 mm. 3. The electrostatic image according to claim 1, wherein the polymerized toner particles produced have a volume average particle size of 2 to 20 μm and a particle size distribution (volume average particle size / number average particle size) of 1.6 or less. Method for producing developing toner.