JP3487131B2 - Color toner for developing electrostatic images and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color toner for developing an electrostatic charge image used for developing an electrostatic latent image in an electrophotographic method, an electrostatic recording method and an electrostatic printing method, and a manufacturing method thereof.

[0002]

2. Description of the Prior Art It is well known in the art to use static electricity to form images on photoconductors. For example, various methods such as US Pat. No. 2,297,691 and Japanese Patent Publication No. 42-23910 are known as electrophotographic methods. An electrostatic latent image is formed on the surface, the latent image is developed with a developer, the toner powder image is transferred to a transfer material such as paper, and then fixed by heating, pressure, heating and pressing, or solvent vapor, etc. To get A cleaning step (or mechanism) for removing the developer remaining on the photoconductor is usually provided. A developing method for visualizing an electrostatic latent image is described in, for example, US Pat.
No. 874,063, the magnetic brush method described in JP-A-2,618,522, the cascade developing method described in JP-A-2,618,522, and the method using a conductive magnetic developer described in JP-A-3,909,258 are known. ing.

As a toner applied to these developing methods, a fine powder in which a dye or a pigment is dispersed in a natural or synthetic resin has been conventionally used. For example, 1 to 2 is obtained by dispersing a colorant in a binder resin such as polyester.
Particles finely pulverized to about 0 μm are used as toner. Further, a so-called two-component developer prepared by mixing the toner with carrier particles such as iron powder is also used.
In recent years, since such a recording method has been widely used not only for general copying machines but also for computer output, the required performance has become higher, and colorization, miniaturization, weight reduction, and low energy consumption have been achieved. Various requirements have come to be made, such as improvement in efficiency and maintenance-free operation. In particular,
With respect to color toners, in addition to sharpness, colorability, and transparency, the use of color toners has become widespread, and since they have come to be used for calendars, posters, marking materials, etc., light resistance is also required. It's starting to happen.

It has been conventionally known that generally, when the particle size of the pigment is reduced and the dispersity is increased, the coloring property, the sharpness and the transparency are improved. When the primary particles are dispersed in a usual disperser such as a ball mill, the coloring property cannot be further improved. This is because the dispersion step using an ordinary disperser mainly breaks the secondary particles into primary particles, and in order to further improve the coloring property, it is necessary to make the primary particles themselves fine.

As a means for making the primary particles themselves fine, there is known a method in which a pigment dissolved in a strong acid such as concentrated sulfuric acid or polyphosphoric acid is put into cold water to precipitate the pigment as fine particles. However, the pigments that can be used are remarkably limited in terms of solubility and stability of the pigment in a strong acid. For example, Japanese Patent Publication No. 27728/1995 proposes a method of obtaining a blue toner by using a phthalocyanine pigment deposited by an acid paste method or the like, but even if finely sized primary particles are obtained, the pigment is contained in the binder resin. Since the primary particle pigment causes strong secondary agglomeration due to the use of a solvent or heating to a high temperature in the step of dispersing the toner, it is difficult to disperse the primary particles again in the toner, and it is satisfactory in terms of transparency and the like. Not something you can do.

As another method, there is known a method in which a pigment and a solid resin are heated and kneaded strongly with a two-roll or Banbury mixer. However, since organic pigments generally grow crystals at high temperatures, there is a limit to the miniaturization of pigments.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a color toner for developing an electrostatic charge image which is excellent in light resistance in addition to colorability, vividness and transparency.

[0008]

SUMMARY OF THE INVENTION A first invention is an organic pigment.
And water-soluble inorganic salt, colloidal silica and water-soluble solvent
After mechanically mixing the
Fine particle organic pigment obtained by removing inorganic salt and water-soluble solvent
(A1) and fine particle colloidal silica (a2)
Ri, fine against particulate organic pigment (a1) 100 parts by weight
A color toner for developing an electrostatic charge image, comprising a colorant (A) containing 1 to 150 parts by weight of child colloidal silica (a2) and a binder resin (B).

The second aspect of the invention is to add the coloring agent (A) in an amount of 0.1 to 1
The color toner for developing an electrostatic charge image according to the first invention, characterized in that the content is 5% by weight.

A third invention is a fine particle organic pigment (a1).
Particle size of is 0.01 to 0.5 [mu] m, particulate colloidal
The particle size of dull silica (a2) is 0.001 to 0.1 μm
The electrostatic toner image developing color toner according to the first or H-th aspect of the present invention.

A fourth invention is a fine particle organic pigment (a1).
Is at least one selected from the group consisting of a quinacridone type, a phthalocyanine type, an azo type, an isoindolinone type, a dianthraquinonyl red type, a slene type, and a perylene type. 3 is a color toner for developing an electrostatic charge image according to any one of inventions 3;

A fifth aspect of the invention is to mechanically mix an organic pigment, a water-soluble inorganic salt, colloidal silica and a water-soluble solvent, and then wash with water to remove the water-soluble inorganic salt and the water-soluble solvent. (A) containing fine particle organic pigment (a1) and fine particle colloidal silica (a2)
And a binder resin (B) are melted and kneaded to provide a color toner for developing an electrostatic charge image.

A sixth aspect of the invention is a mixture of a fine particle organic pigment (a1) obtained by removing a water-soluble inorganic salt and a water-soluble solvent, a fine particle colloidal silica (a2), and water, together with a resin for dispersion. A color for developing an electrostatic charge image according to the fifth invention, characterized in that the colorant (A2) obtained by kneading using a shearing force to remove water and the binder resin (B) are melt-kneaded. It is a method of manufacturing a toner.

A seventh invention is a fine particle organic pigment (a1).
Particle size of is 0.01 to 0.5 [mu] m, particulate colloidal
The particle size of dull silica (a2) is 0.001 to 0.1 μm
And a method for producing a color toner for developing an electrostatic charge image according to the fifth or sixth invention.

An eighth aspect of the invention is the electrostatic charge according to any one of the fifth aspect to the seventh aspect, characterized in that the water-soluble inorganic salt is used in a weight ratio of 2 to 20 times with respect to the water-soluble solvent. A method for producing a color toner for image development.

The ninth invention is a fine particle organic pigment (a1).
Is a quinacridone-based, phthalocyanine-based, azo-based, isoindolinone-based, dianthraquinonyl red-based, slene-based, perylene-based, at least one selected from the fifth invention, characterized in that 8 is a method for producing a color toner for developing an electrostatic charge image according to any one of the inventions 8 to 8

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The color toner for developing an electrostatic charge image of the present invention comprises a fine particle organic pigment (a1) and a fine particle colloidal dye.
It is characterized by containing Rika (a2). By containing the colloidal silica (a2) in addition to the fine particle organic pigment (a1), the sharpness of the image is excellent when the toner is fixed on the transfer material. The particle size of the fine particle organic pigment (a1) used in the present invention is preferably 0.01 to 0.5 μm, and more preferably 0.01 to 0.2 μm, from the viewpoint of color developability and transparency of the obtained image. The particle diameter of the fine particle colloidal silica (a2) is preferably 0.001 to 0.1 μm, and more preferably 0.001 to 0.6 μm.

Such fine organic pigment (a1) and colloid
The colorant (A) containing dal silica (a2) uses an inorganic salt as a crushing aid, and colloidal silica is used together in the step of mechanically finely dividing the primary particles of the organic pigment (this step is hereinafter referred to as salt milling). As a result, it is possible to prevent the aggregation of the organic pigment fine particles in the binder resin and to ensure a finer dispersed state, so compared with the case of using an organic pigment only by conventional salt milling,
It is now possible to obtain an image excellent in color developability, sharpness and transparency.

The specific method of salt milling using colloidal silica in the present invention is shown below. 100 parts by weight of organic pigment and 1 to 1 of colloidal silica
A small amount of a water-soluble solvent is added to a mixture of water-soluble inorganic salts in 150 parts by weight, preferably 5 to 120 parts by weight, and after kneading with a kneader or the like, the kneaded product is put into water, or
Alternatively, water is added to the kneaded product to dissolve the water-soluble inorganic salt and the water-soluble solvent to form a slurry.
Next, the particulate roller filtration of the slurry, particulate organic pigment to remove inorganic salts and solvent repeatedly washed with water (a1)
An aqueous dispersion of a mixture with idalusilica (a2) is obtained.
In the above process, when the amount of the fine particle colloidal silica is less than 1 part by weight based on 100 parts by weight of the organic pigment, the obtained fine particle organic pigment (a1) and the fine particle colloidal silica (a ) are obtained.
Even when (2) and ( 2) are used as the colorant (A) of the toner, the sharpness of the image is not improved, while when it exceeds 150 parts by weight, the color developability is adversely affected and the sharpness of the image is deteriorated.

The water-soluble inorganic salt used in the salt milling treatment in the present invention includes common salt, potassium chloride,
Glauber's salt etc. are mentioned. The amount of the water-soluble inorganic salt used is 2 to 20 times, and more preferably 3 to 15 times the weight ratio of the water soluble solvent.

The water-soluble solvent used in the salt milling treatment in the present invention is not particularly limited as long as it is water-soluble, but it is preferable to use a solvent having a high boiling point in order to prevent the solvent from evaporating. The water-soluble solvent is a binder and is added for the purpose of preventing crystallization. As an example, 2-
(Methoxymethoxy) ethanol, 2-butoxyethanol, 2- (isopentyloxy) ethanol, 2-
(Hexyloxy) ethanol, diethylene glycol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, triethylene glycol monomethyl ether, liquid polyethylene glycol, 1-methoxy-2-propanol,
1-ethoxy-2-propanol, 1-ethoxy-2-
Propanol, dipropylene glycol, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, low molecular weight polypropylene glycol and the like are used. The amount of the water-soluble solvent used is preferably 2 to 10 times the weight of the organic pigment to be treated.

As the organic pigment to be subjected to the salt milling treatment in the present invention, it is preferable to use an organic pigment having a hardness lower than that of the inorganic salt of the crushing aid. When the color index (CI) number is shown as an example of the organic pigment, the phthalocyanine type is C.I. I. Pigment Blue 15, 1
5: 1, 15: 2, 15: 3, 15: 4, 15: 6,
C. I. Pigment Green 7, 36, and C.I. I. Pigment Blue 60, 64 and C.I. I. Pigment Violet 23, 3
7. As the azo type, C.I. I. Pigment Yellow 1,
2, 3, 5, 6, 10, 12, 13, 14, 17, 4
9, 55, 60, 61, 62: 1, 63, 65, 73,
74, 75, 81, 83, 87, 90, 93, 94, 9
5, 97, 98, 106, 111, 113, 114, 1
16, 121, 124, 126, 127, 128, 13
0, 136, 152, 165, 166, 167, 17
0, 171, 172, 174, 176, 188, C.I.
I. Pigment Orange 1, 6, 13, 15, 16, 3
1, 34, 64, C.I. I. Pigment Red 37, 3
8, 41, 48: 1, 48: 2, 48: 3, 48: 4,
48: 5, 57: 1, 58: 2, 58: 4, 63: 1,
63: 2, 64, 64: 1, 111, 144, 166,
214, 220, 221, 242, 248, 262,
C. I. Pigment Brown 23, 41, 42 and Cinacridone-based C.I. I. Pigment Orange 48, 4
9, C.I. I. Pigment Red 122, 192, 20
2, 206, 207, 209, C.I. I. Pigment Violet 19, 42, and naphthol-based pigments include C.I. I.
Pigment Orange 2, 5, 22, 24, 38, 46,
C. I. Pigment Red 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14, 15, 1
6, 17, 18, 21, 22, 23, 31, 32, 4
9, 49: 1, 49: 2, 49: 3, 50: 1, 51:
1, 53, 53: 1, 60: 1, 66, 67, 68, 9
5, 112, 114, 119, 136, 146, 14
7, 148, 150, 151, 164, 170, 18
4, 187, 188, 210, 212, 213, 22
2, 223, 237, 243, 245, 247, 24
7: 1, 253, 256, 258, 261, C.I. I. Pigment Violet 13, 25, 44, 50, C.I.
I. Pigment Brown 1 and C. as a perylene type.
I. Pigment Red 123, 149, 178, 17
9, 190, 224, C.I. I. Pigment Violet 29, C.I. I. Pigment Black 31, 32, and C.I. as diketopyrrolopyrrole series. I. Pigment Red 254, 255 and isoindolinone type C.I. I.
Pigment Yellow 109, 110, 173, benzimidazolone-based C.I. I. Pigment Yellow 12
0, 151, 154, 175, 180, 181, 19
4, C.I. I. Pigment Orange 36, 60, 62,
C. I. Pigment Red 175, 176, 185, 2
08, C.I. I. Pigment Violet 32, C.I. I.
Pigment Brown 25, quinophthalone type,
C. I. Pigment Yellow 138, anthraquinone type C.I. I. Pigment Yellow 123, 147,
193, C.I. I. Pigment Red 89, 168, 17
7, C.I. I. Pigment Violet 5: 1, C.I. I.
Pigment Black 20 and the like can be exemplified. The organic pigment to be subjected to the salt milling treatment may be in a wet state where it is sufficiently washed with water after the pigment synthesis reaction or in a dry state where it is commercialized. Further, a surface-treated pigment having a functional group added to the surface of the pigment may be used.

In the present invention, as described above,Colloid
Dull silicaSalt milling process
Fine particle organic pigment (a1) and fine particlesColloidal silica
Aqueous dispersion of mixture with (a2) (hereinafter referred to as mixture)
May be washed with water and dried as usual to be used as a powder pigment.
Of water or salt-milled mixture above
Kneading the functional dispersion with the binder resin for the toner described below.
Toner may be obtained or an aqueous dispersion of the above mixture
Knead the body with resin for dispersion by applying mechanical shearing force
Transfer the mixture to a resin for dispersion, remove water and mix.
To obtain a resin dispersion of the compound, and to add the resin dispersion of the mixture to a coloring agent.
The toner is mixed with a binder resin for toner described later as
The third person is that the pigment may not be aggregated easily.
Method is most preferred.

In the case of the third method, the colorant, that is, the resin for dispersion used in obtaining the resin dispersion of the mixture may be the same as the binder resin described below, or may be different. A system resin may be used. When a resin of a different system from the binder resin is used, it is preferable to use a resin having high compatibility with the binder resin in order to highly disperse the pigment. Such a method is preferably carried out under heating in order to ensure the affinity between the resin for dispersion and the treated organic pigment, so if an organic solvent is also used, the heating temperature should be adjusted so that the solvent is difficult to evaporate. It is preferable that the boiling point is not higher than the boiling point of the organic solvent used. This is because when the solvent evaporates due to heat, the fine pigment particles agglomerate and the transparency and color developability deteriorate.
However, it is preferable to use only water from the viewpoint of energy cost and environmental protection without requiring an organic solvent recovery step.

When the colorant (A) in the present invention is obtained, a phthalocyanine pigment derivative, a dispersant such as a polymeric dispersant, and an additive such as a plasticizer may be used in combination, or two or more kinds of treatments may be performed. You may mix and process the aqueous dispersion of the organic pigment.

In the process of obtaining the colorant (A) in the present invention, as a device for applying a mechanical shearing force, in addition to the above kneader, a high speed rotation represented by a pressure kneader, three rolls, an extruder and a Henschel mixer. Examples of the mixing / kneading mixer include a plurality of stirring blades and the like.

In the treatment for obtaining the colorant (A) in the present invention, after the mixture is transferred to the resin for dispersion, water may be removed by a general drying method or, if necessary, a three-roll method. Etc. may be used.

In the present invention, the colorant (A) obtained as described above and the binder resin (B) are melt-kneaded while heating,
After cooling, pulverize, or knead the mixture of the mixture and water together with the resin for dispersion by applying mechanical shearing force, transfer the mixture to the resin for dispersion, and remove water to color A method for producing a color toner for developing an electrostatic charge image, which comprises melt-kneading an agent (A1) and a binder resin (B) while heating, cooling and then pulverizing, wherein the pigment is hard to aggregate. The latter method is preferred. 1 to 1 of the fine particle organic pigment (a1) obtained as described above is contained in the toner particles.
It is preferable to contain 0% by weight. If it is less than the above range, the image density is lowered, and if it is more than the above range, the charging property is lowered, which causes fog.

Examples of the binder resin used in the present invention include resins having good fixability and excellent transparency, such as polyester resins, acrylic resins, styrene-acrylic resins and epoxy resins. Of these, a non-linear resin is more preferable, and a polyester resin is particularly preferable. A bisphenol derivative represented by a bisphenol A-alkylene oxide adduct or a substitution product thereof is used alone as a diol component, or It is preferably used in combination with an aliphatic dialcohol, and these diol components are condensed or co-condensed with a divalent or higher carboxylic acid, for example, a carboxylic acid component such as fumaric acid, terephthalic acid or trimellitic acid. To be

In the present invention, the melt-kneading temperature of the colorant (A) and the binder resin (B) or the melt-kneading temperature of the colorant (A1) and the binder resin (B) is preferably 100 to 140 ° C. , And more preferably 110 to 130 ° C. By kneading within the above range, the colorability of the toner is improved. In the present invention, when the colorant (A) and the binder resin (B) are melt-kneaded, a known charge control agent such as a metal salt of a salicylic acid derivative or a polymer type quaternary ammonium salt is contained. Alternatively, waxes may be internally added. Further, an external additive such as a fluidizing agent for a metal oxide (alumina, titania, silica) or a fine powder of a polymer (polystyrene, polymethacrylate, polyvinylidene fluoride, etc.) that has been hydrophobized or a transfer agent is used. You can also

[0031]

EXAMPLES The present invention will be described below based on examples. In the examples, "parts" means "parts by weight". [Example 1] Crude copper phthalocyanine (copper phthalocyanine manufactured by Toyo Ink): 250 parts, sodium chloride: 250
0 parts, 833 parts of colloidal silica water dispersion having a solid content of 30% obtained by dispersing Snowtex 30 (Colloidal silica manufactured by Nissan Chemical Industries) in water, and diethylene glycol 200
The part (manufactured by Tokyo Kasei) was placed in a stainless steel 1-gallon kneader (manufactured by Inoue Seisakusho) and kneaded for 3 hours. Next, this mixture was poured into 2.5 liters of warm water and heated to about 80 ° C. and stirred. After stirring for about 1 hour to form a slurry,
Filtration and washing with water were repeated 5 times to remove sodium chloride and the solvent to obtain an aqueous pigment dispersion having a solid content of 50% (treated pigment dispersion). When the aqueous pigment dispersion thus obtained was observed with a transmission electron microscope, the particle size of copper phthalocyanine was 0.13 μm and the particle size of colloidal silica was 0.0.
It was 3 μm.

(Method for producing cyan colorant (A1)) The above organic pigment (treated pigment dispersion, solid content 50%) 100 parts Linear polyester resin 50 parts Polymeric dispersant 2.5 parts Supermixer (Kawata) Mix the above ingredients into
The mixture was heated and kneaded at 0 ° C., water was removed, the mixture was cooled, and then pulverized to prepare a cyan colorant.

(Method for producing cyan toner) Non-linear polyester resin 100 parts Cyan colorant 5 parts The above raw materials are mixed with a Henschel mixer (Mitsui Mining Co., Ltd.),
The mixture was melt-kneaded with an extruder, pulverized, and classified to obtain base cyan toner particles A having a volume average particle diameter of 8.5 μm. Next, the hydrophobized anatase-type titanium oxide fine particles were added in an amount of 0.
6 parts was added to obtain a cyan toner.

(Preparation of Cyan Developer) An average particle size of 50 μm obtained by coating 5 parts of the above cyan toner with a silicone resin.
A color developer was prepared by mixing 95 parts of a ferrite carrier of m.

Example 2 In the same manner as in Example 1 except that the crude copper phthalocyanine of Example 1 was replaced with 260 parts of a yellow pigment (Hoster Palm Yellow H3G: Hansa Yellow type manufactured by Hoechst), an aqueous pigment dispersion, yellow was obtained. Colorants,
A base yellow toner, a yellow toner and a yellow developer were obtained.

Example 3 In the same manner as in Example 1, except that the crude copper phthalocyanine of Example 1 was replaced with 250 parts of a red pigment (Hostar Palm Pink E: quinacridone type manufactured by Hoechst), an aqueous pigment dispersion, red color was prepared. A colorant, a mother red toner, a red toner and a red developer were obtained.

[Comparative Example 1] Regarding the blue pigment, the yellow pigment and the red pigment used in Examples 1, 2 and 3, when an aqueous pigment dispersion was obtained, an aqueous pigment dispersion was obtained without using colloidal silica. Dried aqueous pigment dispersion to powder pigment,
Using this as a colorant, color toners of respective colors were obtained.

Comparative Example 2 An aqueous pigment dispersion, a cyan colorant, a cyan colorant, a base cyan toner, a cyan toner, and a pigment were prepared in the same manner as in Example 1 except that 250 parts of crude phthalocyanine was replaced with 500 parts of crude phthalocyanine. A cyan developer was obtained.

Example 4 An aqueous pigment dispersion, yellow coloring was carried out in the same manner as in Example 1 except that 250 parts of a yellow pigment (Benzidine Yellow: azo type manufactured by Toyo Ink) was used instead of the crude copper phthalocyanine of Example 1. To obtain a base yellow toner, a yellow toner and a yellow developer.

[Example 5] Red pigment (CIBA's chromophthal red A-2B: diaminodianthranil type)
240 parts, 1600 parts of sodium chloride and 200 parts of diethylene glycol were charged into a stainless steel 1 gallon kneader and kneaded for 3 hours. This mixture was put into 2.5 liters of warm water together with 250 parts of colloidal silica used in Example 1, and heated to about 80 ° C. and stirred. After about 1 hour to make a slurry, filtration and washing with water were repeated 5 times to remove sodium chloride and the solvent, and an aqueous pigment dispersion having a solid content of 50%, a red colorant, and a base red toner were prepared in the same manner as in Example 1. A red toner and a red developer were obtained.

Example 6 An aqueous pigment was prepared in the same manner as in Example 1 except that 200 parts of a blue pigment (Lionogen Blue 6505: Indanthrene series manufactured by Toyo Ink Co., Ltd.) was used instead of the crude copper phthalocyanine of Example 1. Dispersion, cyan colorant,
Cyan colorant, mother cyan toner, cyan toner and cyan developer were obtained.

Example 7 An aqueous dispersion (treated pigment dispersion) was prepared in the same manner as in Example 1 except that 250 parts of a red pigment (Palitor Red L3670: Perylene type manufactured by CIBA) was used instead of the crude copper phthalocyanine of Example 1. ) Got. Then, in the same manner as in Example 1, an aqueous pigment dispersion, a red colorant, a base red toner, a red toner and a red developer were obtained.

[Evaluation] (Transparency) Using a developer of each color obtained in each Example and each Comparative Example by a digital color copying machine, the adhered amount of each color toner was 0.8 mg / cm on an OHP sheet. ^It was fixed so as to be ^2, and the transparency was evaluated. The results are shown in Table 1. <Visual Transparency Criteria> A: Good transparency B: Almost transparent, but poor in sharpness and dull. X: Transparency is extremely poor.

(Sharpness) With a digital color copying machine,
The developers of the respective colors obtained in the respective examples and the respective comparative examples were respectively used, and the sharpness after copying 10,000 standard white plain papers was evaluated. The results are shown in Table 1. <Visual Clarity Criteria> ○: The dark and light color areas are well colored and clear Δ: The dark color areas are clear, but the light color areas are not sufficiently colored, and slightly unclear ×: The dark and light color areas are poorly colored and unclear

(Fog) Similar to the above-mentioned sharpness, the difference in reflection density between the non-image area and the standard plain paper after 10,000 copies were copied to the white standard plain paper to evaluate the fog condition. The results are shown in Table 1. <Fog Evaluation Criteria> Photovoltaic 577 (Photovoltaic) is used for measurement. ○: Good fog value less than 1.0 △: Practical level fog value 1.0 or more and less than 1.5 ×: No fog value 1.5 or more

[0046]

[Table 1]

[0047]

EFFECTS OF THE INVENTION According to the present invention, by using colloidal silica together during salt milling, the organic pigment in the color toner is dispersed in a more fine particle form, so that it is possible to obtain a clear image without impairing the light transparency on the OHP sheet. It is possible to obtain a color toner for developing an electrostatic charge image, which gives a fog-free image having good properties.

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Claims (9)

(57) [Claims] 1. An organic pigment, a water-soluble inorganic salt, and colloidal citric acid.
After mechanically mixing Rica and a water-soluble solvent, wash with water
By removing the water-soluble inorganic salt and water-soluble solvent
Fine particle organic pigment (a1) and fine particle colloidal silica
Fine particle organic pigment (a1) 100 consisting of mosquito (a2)
Particulate colloidal silica (a2) 1 to 1 with respect to parts by weight
A color toner for developing an electrostatic charge image, which comprises a colorant (A) containing 50 parts by weight and a binder resin (B). 2. The color toner for developing an electrostatic charge image according to claim 1, which contains the colorant (A) in an amount of 0.1 to 15% by weight. 3. The fine particle organic pigment (a1) has a particle size of 0.
01-0.5 μm, fine particle colloidal silica (a
The color toner for developing an electrostatic charge image according to claim 1 or 2, wherein the particle size of 2) is 0.001 to 0.1 µm. 4. The fine particle organic pigment (a1) is at least one selected from the group consisting of quinacridone type, phthalocyanine type, azo type, isoindolinone type, dianthraquinonyl red type, slene type and perylene type. The color toner for developing an electrostatic charge image according to any one of claims 1 to 3, wherein 5. An organic pigment, a water-soluble inorganic salt, and colloidal
After mechanical mixing the silica and water-soluble solvent, washing the fine particles and fine particles organic pigment formed by removing the water-soluble inorganic salts and water-soluble solvent (a1) by Koroidarushi
A method for producing a color toner for developing an electrostatic charge image, which comprises melt-kneading a colorant (A) containing lica (a2) and a binder resin (B). 6. A fine particle organic pigment (a1) obtained by removing a water-soluble inorganic salt and a water-soluble solvent, and a colloidal fine particle .
A colorant (A) obtained by kneading a mixture of lica (a2) and water together with a resin for dispersion using mechanical shearing force to remove water.
6. The method for producing a color toner for developing an electrostatic charge image according to claim 5, wherein 2) and the binder resin (B) are melt-kneaded. 7. The particle diameter of the fine particle organic pigment (a1) is 0.
01-0.5 μm, fine particle colloidal silica (a
7. The method for producing a color toner for developing an electrostatic charge image according to claim 5, wherein the particle diameter of 2) is 0.001 to 0.1 μm. 8. The method for producing a color toner for developing an electrostatic charge image according to claim 5, wherein a water-soluble inorganic salt is used in a weight ratio of 2 to 20 times the water-soluble solvent. . 9. The fine particle organic pigment (a1) is at least one selected from the group consisting of quinacridone type, phthalocyanine type, azo type, isoindolinone type, dianthraquinonyl red type, slene type and perylene type. 9. The method for producing a color toner for developing an electrostatic charge image according to claim 5, wherein