JP6040857B2 - Electrostatic image developing toner, electrostatic image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method - Google Patents

Description

  The present invention relates to an electrostatic charge image developing toner, an electrostatic charge image developer, a toner cartridge, a process cartridge, an image forming apparatus, and an image forming method.

Electrophotographic image formation generally reproduces colors using toners of four colors, yellow (Y), magenta (M), cyan (C), and black (K). Further, in order to reproduce a color that is difficult to reproduce with only the four-color toner (YMCK), toners of colors other than YMCK are also used.
For example, Patent Document 1 discloses a light magenta toner containing a combination of a magenta colorant and a hue-adjusting colorant that absorbs light at a wavelength of about 400 nm to about 500 nm.
Patent Document 2 discloses C.I. I. A red toner using bat red 41 as a coloring material is disclosed.
Further, Patent Document 3 discloses C.I. I. An orange toner containing Pigment Orange 38 is disclosed.

JP 2011-150336 A JP 2011-242431 A JP 2012-68581 A

  An object of the present invention is to provide an electrostatic image developing toner excellent in color reproducibility of PANTONE 1788C.

The above problem is solved by the following means. That is,
The invention according to claim 1
A toner for developing an electrostatic charge image, which is a red toner, comprising toner particles containing a binder resin and a colorant and satisfying the following condition (A):
Condition (A): C.I. I. Pigment Orange 38 has a content of 5.7% by mass to 8.1% by mass, and C.I. I. The content ratio of Pigment Red 185 is 1.7% by mass or more and 2.9% by mass or less.
The invention according to claim 2
2. The electrostatic charge image developing toner according to claim 1, wherein a color difference ΔE between an image formed on the coated paper with the electrostatic charge image developing toner and a color sample recorded on the coated paper, PANTONE 1788C, is less than 9. 3. .

The invention according to claim 3
The electrostatic image developing toner according to claim 1 , wherein the toner particles satisfy at least one of the following condition (B1) and condition (B2).
Condition (B1): C.I. I. Pigment Orange 38 content is 6.3 mass% or more and 7.3 mass% or less, and C.I. I. The content ratio of Pigment Red 185 is 1.7% by mass or more and 2.7% by mass or less.
Condition (B2): C.I. I. Pigment Orange 38 has a content of 6.1% by mass to 7.5% by mass, and C.I. I. The content rate of Pigment Red 185 is 1.9% by mass or more and 2.5% by mass or less.

The invention according to claim 4
The electrostatic charge image developing toner according to claim 1, wherein the toner particles satisfy the following condition (C).
Condition (C): C.I. I. Pigment Orange 38 content is 6.3 mass% or more and 7.3 mass% or less, and C.I. I. The content rate of Pigment Red 185 is 1.9% by mass or more and 2.5% by mass or less.

The invention according to claim 5
Electrostatic image developer comprising a toner according to any one of claims 1 to 4.

The invention according to claim 6
Containing the toner for developing an electrostatic charge image according to any one of claims 1 to 4 ,
A toner cartridge to be attached to and detached from the image forming apparatus.

The invention according to claim 7 provides:
A developing means for containing the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the surface of the image carrier as a toner image by the electrostatic charge image developer,
A process cartridge attached to and detached from the image forming apparatus.

The invention according to claim 8 provides:
An image carrier,
Charging means for charging the surface of the image carrier;
An electrostatic charge image forming means for forming an electrostatic charge image on the surface of the charged image carrier;
Developing means for containing the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the surface of the image carrier as a toner image by the electrostatic charge image developer;
Transfer means for transferring a toner image formed on the surface of the image carrier to the surface of a recording medium;
Fixing means for fixing the toner image transferred to the surface of the recording medium;
An image forming apparatus comprising:

The invention according to claim 9 is:
A charging step for charging the surface of the image carrier;
An electrostatic charge image forming step of forming an electrostatic charge image on the surface of the charged image carrier;
A developing step of developing an electrostatic image formed on the surface of the image carrier as a toner image by the electrostatic image developer according to claim 5 ;
A transfer step of transferring a toner image formed on the surface of the image carrier to the surface of a recording medium;
A fixing step of fixing the toner image transferred to the surface of the recording medium;
An image forming method comprising:

According to the first aspect of the present invention, there is provided an electrostatic charge image developing toner excellent in color reproducibility of PANTONE 1788C as compared with a case where toner particles do not satisfy the condition (A).
According to the third aspect of the present invention, there is provided an electrostatic charge image developing toner that is superior in the color reproducibility of PANTONE 1788C as compared with the case where the toner particles do not satisfy both the conditions (B1) and (B2). The
According to the fourth aspect of the present invention, there is provided an electrostatic charge image developing toner that is superior in the color reproducibility of PANTONE 1788C as compared with the case where the toner particles do not satisfy the condition (C).

According to the fifth aspect of the present invention, there is provided an electrostatic charge image developer that is superior in color reproducibility of PANTONE 1788C as compared with a case where toner particles contained in the toner do not satisfy the condition (A).
According to the sixth aspect of the present invention, there is provided a toner cartridge that is superior in color reproducibility of the PANTONE 1788C as compared with the case where the toner particles contained in the toner do not satisfy the condition (A).
According to the seventh aspect of the present invention, there is provided a process cartridge excellent in color reproducibility of the PANTONE 1788C compared to a case where the toner particles contained in the toner in the developer do not satisfy the condition (A).
According to the eighth aspect of the present invention, there is provided an image forming apparatus that is superior in color reproducibility of the PANTONE 1788C as compared with the case where the toner particles contained in the toner in the developer do not satisfy the condition (A).
According to the ninth aspect of the present invention, there is provided an image forming method that is superior in the color reproducibility of PANTONE 1788C compared to the case where the toner particles contained in the toner in the developer do not satisfy the condition (A).

1 is a schematic configuration diagram illustrating an example of an image forming apparatus according to an exemplary embodiment. It is a schematic block diagram which shows an example of the process cartridge which concerns on this embodiment.

  Embodiments of the present invention will be described below. In addition, these description and Examples illustrate this invention, and do not restrict | limit the scope of the present invention.

  In this specification, (meth) acryl means acryl and methacryl, (meth) acrylic acid means acrylic acid and methacrylic acid, and (meth) acrylo means acrylo and methacrylo.

<Toner for electrostatic image development>
The electrostatic image developing toner (also referred to as “toner”) according to this embodiment includes toner particles and may further include an external additive. That is, in the present embodiment, the toner particles may be toner, or the toner particles may be externally added with the toner as toner.

  The toner particles constituting the toner according to the exemplary embodiment include a binder resin and a colorant. I. Pigment Orange 38 has a content of 5.7% by mass to 8.1% by mass, and C.I. I. The content ratio of Pigment Red 185 is 1.7% by mass or more and 2.9% by mass or less. As the colorant contained in the toner particles, C.I. I. Pigment orange 38 and C.I. I. By combining Pigment Red 185 with the above content, a toner having excellent color reproducibility of PANTONE 1788C is provided.

The image formed on the recording medium with the toner according to the present embodiment is the C.I. I. Pigment orange 38 content and C.I. I. The color difference ΔE with the PANTONE 1788C is smaller than that of an image formed on a recording medium with toner whose pigment red 185 content is not within the above range.
Here, the color difference ΔE is a color difference represented by the L ^* value, a ^* value, and b ^* value in the CIE 1976 L ^* a ^* b ^* color system, and is defined by the following equation.

In the above formula, L ₁ , a ₁ , and b ₁ are L ^* value, a ^* value, and b ^* value of PANTONE 1788C, and are obtained by measuring a commercially available color sample (coated paper) with a reflection spectral densitometer. Value. L ₂ , a ₂ , and b ₂ are L ^* value, a ^* value, and b ^* value of an image formed on the coated paper by the toner according to the present embodiment, and the image is measured by a reflection spectral densitometer. Is the value obtained.

  The smaller the color difference ΔE defined by the above equation, the better. The upper limit of the color difference ΔE is preferably less than 9, more preferably less than 5, still more preferably less than 4, and still more preferably less than 3.

C. contained in toner particles. I. Pigment orange 38 and C.I. I. The content rate of the pigment red 185 can be confirmed by the following operations (1) to (2).
(1) Toner particles are obtained by removing external additives from the toner.
The toner is charged and dispersed in ion exchange water containing 0.1% by mass of a surfactant. Next, ultrasonic waves are applied to release the external additive on the toner surface from the toner surface, and the dispersion is suction filtered. This dispersion and filtration are repeated three times, and then dried to obtain toner particles.
(2) Analyzing elements contained in toner particles using a fluorescent X-ray analyzer.
Using a fluorescent X-ray analyzer (XRF-1500, manufactured by Shimadzu Corporation), a disk having a toner particle amount of 0.130 g was molded, and under conditions of an X-ray output of 40 V-70 mA, a measurement area of 10 mmφ, and a measurement time of 15 minutes, Qualitative quantitative all elemental analysis was performed. I. CI net strength of C.I. I. The net strength of S derived from Pigment Red 185 is determined.
In addition, C.I. I. Pigment orange 38 and C.I. I. CI Pigment Red 185 is mixed with the resin, and the concentration in four stages (CI Pigment Orange 38 is 5 mass%, 10 mass%, 15 mass%, 20 mass%, CI Pigment Red 185 is 1 mass%. The sample adjusted to 2 mass%, 3 mass%, 4 mass%) is subjected to the same analysis as described above, and a calibration curve is created.
And C.I. I. CI net strength of C.I. I. From the net intensity of S derived from Pigment Red 185 and the calibration curve, C.I. I. Pigment orange 38 and C.I. I. The content rate of pigment red 185 is calculated | required.

[Toner particles]
The toner particles contain a binder resin and a colorant, and may further contain a release agent and other internal additives.
Hereinafter, components contained in the toner particles will be described in detail.

-Binder resin-
Examples of the binder resin include styrenes (for example, styrene, parachlorostyrene, α-methylstyrene, etc.), (meth) acrylic acid esters (for example, methyl (meth) acrylate, ethyl (meth) acrylate, (meth ) N-propyl acrylate, n-butyl (meth) acrylate, lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate), ethylenically unsaturated nitriles (eg (meth) acrylonitrile), vinyl ether Homopolymers (eg, vinyl methyl ether, vinyl isobutyl ether, etc.), vinyl ketones (eg, vinyl methyl ketone, vinyl ethyl ketone, vinyl isopropenyl ketone, etc.), olefins (eg, ethylene, propylene, butadiene, etc.) A polymer is mentioned.
Typical binder resins include, for example, polyester resins, epoxy resins, polyurethane resins, polyamide resins, cellulose resins, polyether resins, polystyrene, styrene- (meth) acrylic acid alkyl copolymers, styrene- (meth) acrylonitrile. Examples thereof include a copolymer, a styrene-butadiene copolymer, and a styrene-maleic anhydride copolymer.
These resins may be used alone or in combination of two or more.

  The content of the binder resin in the toner particles is preferably 40% by mass to 93% by mass, more preferably 50% by mass to 90% by mass, and further preferably 60% by mass to 85% by mass.

A polyester resin is suitable as the binder resin.
A polyester resin may be used in combination with an amorphous polyester resin and a crystalline polyester resin in that the color reproducibility of PANTONE 1788C is superior.

-Polyester resin As a polyester resin, the condensation polymer of polyhydric carboxylic acid and polyhydric alcohol is mentioned, for example. As the polyester resin, a commercially available product may be used, or a synthesized resin may be used.

Examples of the polyvalent carboxylic acid include aliphatic dicarboxylic acids (eg, oxalic acid, malonic acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, succinic acid, alkenyl succinic acid, adipic acid, sebacic acid, etc.) Alicyclic dicarboxylic acids (for example, cyclohexanedicarboxylic acid), aromatic dicarboxylic acids (for example, terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, etc.), their anhydrides, or lower (for example, having 1 or more carbon atoms) 5 or less) alkyl esters. Among these, as polyvalent carboxylic acid, aromatic dicarboxylic acid is preferable, for example.
The polyvalent carboxylic acid may be used in combination with a dicarboxylic acid or a trivalent or higher carboxylic acid having a crosslinked structure or a branched structure. Examples of the trivalent or higher carboxylic acid include trimellitic acid, pyromellitic acid, anhydrides thereof, and lower (for example, having 1 to 5 carbon atoms) alkyl esters.
A polyvalent carboxylic acid may be used individually by 1 type, and may use 2 or more types together.

Examples of the polyhydric alcohol include aliphatic diols (for example, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butanediol, hexanediol, neopentyl glycol, etc.), alicyclic diols (for example, cyclohexanediol, cyclohexanedimethanol, Hydrogenated bisphenol A, etc.) and aromatic diols (for example, ethylene oxide adducts of bisphenol A, propylene oxide adducts of bisphenol A, etc.). Among these, as the polyhydric alcohol, for example, aromatic diols and alicyclic diols are preferable, and aromatic diols are more preferable.
The polyhydric alcohol may be used in combination with a diol and a trivalent or higher alcohol having a crosslinked structure or a branched structure. Examples of the trivalent or higher alcohol include glycerin, trimethylolpropane, pentaerythritol and the like.
A polyhydric alcohol may be used individually by 1 type, and may use 2 or more types together.

The glass transition temperature (Tg) of the polyester resin is preferably 50 ° C. or higher and 80 ° C. or lower, and more preferably 50 ° C. or higher and 65 ° C. or lower.
The glass transition temperature is determined from a DSC curve obtained by differential scanning calorimetry (DSC). More specifically, it is determined by “extrapolated glass transition start temperature” described in JIS K7121-1987 “Method for Measuring Glass Transition Temperature”.

The weight average molecular weight (Mw) of the polyester resin is preferably from 5,000 to 1,000,000, and more preferably from 7,000 to 500,000.
The number average molecular weight (Mn) of the polyester resin is preferably 2,000 or more and 100,000 or less.
The molecular weight distribution Mw / Mn of the polyester resin is preferably 1.5 or more and 100 or less, and more preferably 2 or more and 60 or less.
The weight average molecular weight and number average molecular weight of the resin are measured by gel permeation chromatography (GPC). The molecular weight measurement by GPC is performed using HLC-8120 manufactured by Tosoh Corporation as a measuring device, TSKgel SuperHM-M15 cm manufactured by Tosoh Corporation as a column, and tetrahydrofuran as a solvent. The weight average molecular weight and the number average molecular weight are calculated using a molecular weight calibration curve prepared from a monodisperse polystyrene standard sample from this measurement result.

-Colorant-
The toner particles are C.I. I. Pigment orange 38, C.I. I. Pigment Red 185 is contained within the following conditions (A).
Condition (A): C.I. I. Pigment Orange 38 has a content of 5.7% by mass to 8.1% by mass, and C.I. I. The content ratio of Pigment Red 185 is 1.7% by mass or more and 2.9% by mass or less.

C. in the toner particles. I. The lower limit of the content ratio of Pigment Orange 38 is 5.7% by mass or more, and 6.1% by mass or more is more desirable, and 6.3% by mass or more is more desirable in terms of excellent color reproducibility of PANTONE 1788C.
C. in the toner particles. I. The upper limit of the content of Pigment Orange 38 is 8.1% by mass or less, and 7.5% by mass or less is more desirable, and 7.3% by mass or less is more desirable in terms of excellent color reproducibility of PANTONE 1788C.
C. in the toner particles. I. The lower limit of the content ratio of Pigment Red 185 is 1.7% by mass or more, and 1.9% by mass or more is more preferable in terms of excellent color reproducibility of PANTONE 1788C.
C. in the toner particles. I. The upper limit of the content rate of Pigment Red 185 is 2.9% by mass or less, and 2.7% by mass or less is more preferable, and 2.5% by mass or less is more preferable in terms of excellent color reproducibility of PANTONE 1788C.

In the toner particles, C.I. I. Pigment orange 38 content and C.I. I. The content ratio of Pigment Red 185 is preferably superior to the color reproducibility of PANTONE 1788C, and preferably satisfies at least one of the following conditions (B1) and (B2), and more preferably satisfies the following condition (C): It is more desirable to satisfy the following condition (D).
Condition (B1): C.I. I. Pigment Orange 38 content is 6.3 mass% or more and 7.3 mass% or less, and C.I. I. The content ratio of Pigment Red 185 is 1.7% by mass or more and 2.7% by mass or less.
Condition (B2): C.I. I. Pigment Orange 38 has a content of 6.1% by mass to 7.5% by mass, and C.I. I. The content rate of Pigment Red 185 is 1.9% by mass or more and 2.5% by mass or less.
Condition (C): C.I. I. Pigment Orange 38 content is 6.3 mass% or more and 7.3 mass% or less, and C.I. I. The content rate of Pigment Red 185 is 1.9% by mass or more and 2.5% by mass or less.
Condition (D): C.I. I. Pigment Orange 38 has a content of 6.5% by mass or more and 7.1% by mass or less, and C.I. I. The content ratio of Pigment Red 185 is 2.1% by mass or more and 2.3% by mass or less.

The toner particles are C.I. I. Pigment orange 38 and C.I. I. Other colorants other than CI Pigment Red 185 may be included. Other colorants may be pigments or dyes, and pigments are desirable from the viewpoint of light resistance and water resistance.
Examples of other colorants include white pigments such as SiO ₂ (silica), TiO ₂ (titania), and Al ₂ O ₃ (alumina); I. Pigment red 122, C.I. I. Pigment red 48: 1, C.I. I. Pigment Red 57: 1, red pigments and dyes such as Rose Bengal; C.I. I. Pigment yellow 97, C.I. I. CI yellow pigments and dyes such as CI Pigment Yellow 12, quinoline yellow and chrome yellow; green pigments and dyes such as malachite green oxalate; I. Pigment blue 15: 1, C.I. I. Pigment blue 15: 3, blue pigments and dyes such as aniline blue, calcoyl blue, ultramarine blue, phthalocyanine blue, and methylene blue chloride; black pigments and dyes such as carbon black, lamp black, and nigrosine;

White pigments such as silica, titania, and alumina may be added to the toner particles for uses other than coloring (for example, toner charge control).
The total amount of the white pigment in the toner particles is preferably 20% by mass or less, more preferably 15% by mass or less, further preferably 10% by mass or less, and more preferably 5% by mass or less from the viewpoint of facilitating the color reproduction of PANTONE 1788C. Even more desirable is 1% by mass or less.

  C. in the toner particles. I. Pigment orange 38, C.I. I. From the viewpoint of facilitating color reproduction of PANTONE 1788C, the content of the colorant other than Pigment Red 185 and the white pigment is preferably 1% by mass or less, and more preferably 0.5% by mass or less for each colorant. 0.1 mass% or less is further desirable, it is even more desirable to say that it is below the detection limit and substantially not contained, and 0 mass% is particularly desirable.

  C. accounts for the total amount of colorant in the toner particles. I. Pigment orange 38, C.I. I. From the viewpoint of facilitating color reproduction of PANTONE 1788C, the total amount of Pigment Red 185 and white pigment is desirably 85% by mass or more, more desirably 90% by mass or more, still more desirably 95% by mass or more, and 99% by mass or more. Is even more desirable, and is particularly desirable to be 100% by weight (ie, free of colorants other than CI Pigment Orange 38, CI Pigment Red 185, and white pigment).

  C. accounts for the total amount of colorant in the toner particles. I. Pigment orange 38 and C.I. I. From the viewpoint of facilitating the color reproduction of PANTONE 1788C, the total amount of CI Pigment Red 185 is desirably 30% by mass or more, more desirably 40% by mass or more, still more desirably 50% by mass or more, and still more desirably 60% by mass or more. , 70% by weight is even more desirable, 80% by weight is even more desirable, 90% by weight is even more desirable, and 100% by weight (ie, other than CI Pigment Orange 38 and CI Pigment Red 185). It is particularly desirable that it does not contain a colorant.

-Release agent-
Examples of mold release agents include hydrocarbon waxes; natural waxes such as carnauba wax, rice wax, and candelilla wax; synthetic or mineral / petroleum waxes such as montan wax; and ester waxes such as fatty acid esters and montanic acid esters. And so on. The release agent is not limited to this.

The melting temperature of the release agent is preferably 50 ° C. or higher and 110 ° C. or lower, and more preferably 60 ° C. or higher and 100 ° C. or lower.
The melting temperature of the release agent is determined from the “melting peak temperature” described in the method for determining the melting temperature in JIS K7121-1987 “Method for measuring transition temperature of plastic” from the DSC curve obtained by differential scanning calorimetry (DSC). ].

  The content of the release agent in the toner particles is preferably 1% by mass or more and 20% by mass or less, and more preferably 5% by mass or more and 15% by mass or less.

-Inorganic oxide particles-
The toner particles may include inorganic oxide particles. Examples of the inorganic oxide include SiO ₂ (silica), TiO ₂ (titania), Al ₂ O ₃ (alumina), CuO, ZnO, SnO ₂ , CeO ₂ , Fe ₂ O ₃ , MgO, BaO, CaO, K. Metal oxides such as ₂ O, Na ₂ O, ZrO ₂ , CaO.SiO ₂ , K ₂ O. (TiO ₂ ) n, Al ₂ O ₃ .2SiO ₂ , CaCO ₃ , MgCO ₃ , BaSO ₄ , MgSO ₄ Can be mentioned.
The surface of the inorganic oxide particles may not be previously hydrophobized or may be hydrophobized in advance.

  The content of the inorganic oxide particles in the toner particles is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, from the viewpoint of hardly affecting the color of the toner. % Or less is more desirable, and 1% by mass or less is particularly desirable.

-Other additives-
Examples of other additives include known additives such as a magnetic material, a charge control agent, and inorganic powder. These additives are contained in the toner particles as internal additives.

-Toner particle characteristics-
The toner particles may be toner particles having a single layer structure, or toner particles having a so-called core / shell structure composed of a core (core particle) and a coating layer (shell layer) covering the core. May be. The toner particles having a core / shell structure include, for example, a binder resin, a colorant, and a core part including other additives such as a release agent as necessary, and a binder resin. And a coating layer.

  The volume average particle diameter (D50v) of the toner particles is preferably 2 μm or more and 10 μm or less, and more preferably 4 μm or more and 8 μm or less.

Various average particle diameters and various particle size distribution indexes of the toner particles are measured using Coulter Multisizer II (manufactured by Beckman-Coulter), and the electrolyte is measured using ISOTON-II (manufactured by Beckman-Coulter).
In the measurement, 0.5 mg to 50 mg of a measurement sample is added as a dispersant to 2 ml of a 5% aqueous solution of a surfactant (preferably sodium alkylbenzenesulfonate). This is added to 100 ml or more and 150 ml or less of the electrolytic solution.
The electrolyte in which the sample is suspended is dispersed for 1 minute with an ultrasonic disperser, and the particle size distribution of particles having a particle size in the range of 2 μm to 60 μm is obtained using a 100 μm aperture with a Coulter Multisizer II. taking measurement. The number of particles to be sampled is 50,000.
A cumulative distribution is drawn from the smaller diameter side to the particle size range (channel) divided based on the measured particle size distribution, and the cumulative particle size of 16% is the volume particle size D16v. D16p, the particle size that is 50% cumulative is defined as the volume average particle size D50v, the number average particle size D50p, and the particle size that is cumulative 84% is defined as the volume particle size D84v and the number particle size D84p.
Using these, the volume average particle size distribution index (GSDv) is calculated as (D84v / D16v) ^1/2 and the number average particle size distribution index (GSDp) is calculated as (D84p / D16p) ^1/2 .

  The shape factor SF1 of the toner particles is preferably 110 or more and 150 or less, and more preferably 120 or more and 140 or less.

The shape factor SF1 is obtained by the following formula.
Formula: SF1 = (ML ² / A) × (π / 4) × 100
In the above formula, ML represents the absolute maximum length of the toner, and A represents the projected area of the toner.
Specifically, the shape factor SF1 is quantified mainly by analyzing a microscope image or a scanning electron microscope (SEM) image using an image analyzer, and is calculated as follows. That is, by capturing an optical microscope image of particles dispersed on the surface of a slide glass into a Luzex image analyzer using a video camera, obtaining the maximum length and projected area of 100 particles, calculating by the above formula, and obtaining the average value can get.

(External additive)
Examples of the external additive include inorganic particles. As the inorganic particles, SiO ₂ , TiO ₂ , Al ₂ O ₃ , CuO, ZnO, SnO ₂ , CeO ₂ , Fe ₂ O ₃ , MgO, BaO, CaO, K ₂ O, Na ₂ O, ZrO ₂ , CaO. _{SiO 2, K 2 O · (} TiO 2) n, Al 2 O 3 · 2SiO 2, CaCO 3, MgCO 3, BaSO 4, MgSO 4 , and the like.

The surface of the inorganic particles as an external additive is preferably subjected to a hydrophobic treatment. The hydrophobic treatment is performed, for example, by immersing inorganic particles in a hydrophobic treatment agent. The hydrophobizing agent is not particularly limited, and examples thereof include silane coupling agents, silicone oils, titanate coupling agents, aluminum coupling agents and the like. These may be used individually by 1 type and may use 2 or more types together.
The amount of the hydrophobizing agent is, for example, 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the inorganic particles.

  Examples of external additives include resin particles (resin particles such as polystyrene, PMMA, and melamine resin), cleaning activators (for example, metal salts of higher fatty acids typified by zinc stearate, particles of a fluorine-based high molecular weight substance), and the like. Can be mentioned.

  The external additive amount of the external additive is, for example, preferably 0.01% by mass or more and 5% by mass or less, and more preferably 0.01% by mass or more and 2% by mass or less with respect to the toner particles.

[Toner Production Method]
The toner according to the exemplary embodiment may be produced by producing toner particles, and the toner particles may be used as a toner, or an external additive may be externally added to the toner particles.

  The toner particles may be produced by any of a dry production method (for example, a kneading pulverization method) and a wet production method (for example, an aggregation coalescence method, a suspension polymerization method, a dissolution suspension method, etc.). There is no restriction | limiting in particular in these manufacturing methods, A well-known manufacturing method is employ | adopted. Among them, it is desirable to obtain toner particles by an aggregation coalescence method.

Specifically, for example, when toner particles are produced by an aggregation coalescence method,
A step of preparing a resin particle dispersion in which resin particles serving as a binder resin are dispersed (resin particle dispersion preparation step);
A step of preparing a colorant dispersion in which colorant particles are dispersed (colorant dispersion preparation step);
Aggregation of resin particles and colorant (and other particles as required) in a dispersion obtained by mixing resin particle dispersion and colorant dispersion (mixing other particle dispersions if necessary) A step of forming aggregated particles (aggregated particle formation step);
Heating agglomerated particle dispersion in which the agglomerated particles are dispersed, fusing and coalescing the agglomerated particles to form toner particles (fusing and fusing step);
Then, toner particles are manufactured.

Hereinafter, the detail of each process of the aggregation coalescence method is demonstrated.
In the following description, a method for obtaining toner particles including a release agent will be described. However, the release agent is used as necessary. Of course, you may use other additives other than a mold release agent.

-Preparation step of resin particle dispersion-
First, a resin particle dispersion in which resin particles to be a binder resin are dispersed is prepared.

  The resin particle dispersion is prepared, for example, by dispersing resin particles in a dispersion medium using a surfactant.

Examples of the dispersion medium used for the resin particle dispersion include an aqueous medium.
Examples of the aqueous medium include water such as distilled water and ion exchange water; alcohols. These may be used individually by 1 type and may use 2 or more types together.

Examples of the surfactant include anionic surfactants such as sulfate ester, sulfonate, phosphate, and soap; cationic surfactants such as amine salt type and quaternary ammonium salt type; polyethylene glycol And nonionic surfactants such as polyphenols, alkylphenol ethylene oxide adducts, and polyhydric alcohols. Among these, an anionic surfactant and a cationic surfactant are particularly mentioned. The nonionic surfactant may be used in combination with an anionic surfactant or a cationic surfactant.
Surfactant may be used individually by 1 type and may use 2 or more types together.

As a method for dispersing the resin particles in the dispersion medium, for example, a general dispersion method using a rotary shearing homogenizer, a ball mill having media, a sand mill, a dyno mill, or the like can be given. Depending on the type of the resin particles, the resin particles may be dispersed in the dispersion medium using, for example, a phase inversion emulsification method.
The phase inversion emulsification method is a method in which a resin to be dispersed is dissolved in a hydrophobic organic solvent in which the resin is soluble, neutralized by adding a base to the organic continuous phase (O phase), and then water (W Phase), the phase inversion from W / O to O / W is performed, and the resin is dispersed in the form of particles in the aqueous medium.

The volume average particle size of the resin particles dispersed in the resin particle dispersion is preferably 0.01 μm or more and 1 μm or less, more preferably 0.08 μm or more and 0.8 μm or less, and further preferably 0.1 μm or more and 0.6 μm or less. .
The volume average particle size of the resin particles is a particle size range obtained by measurement with a laser diffraction particle size distribution measuring device (for example, LA-700, manufactured by HORIBA, Ltd.), and for a divided particle size range (channel), A cumulative distribution is drawn from the small particle diameter side with respect to the volume, and the particle diameter that makes the volume 50% of all the particles is defined as the volume average particle diameter D50v. The volume average particle size of particles in other dispersions is also measured in the same manner.

  5 mass% or more and 50 mass% or less are preferable, and, as for content of the resin particle contained in the resin particle dispersion liquid, 10 mass% or more and 40 mass% or less are more preferable.

-Colorant dispersion preparation process-
The colorant dispersion in which the colorant particles are dispersed is prepared by a method similar to the method for preparing the resin particle dispersion. That is, the dispersion medium, surfactant, dispersion method, volume average particle diameter, and particle content of the colorant dispersion are the same as those of the resin particle dispersion. A colorant-containing resin particle dispersion in which a colorant is dispersed in resin particles may be used instead of the colorant dispersion.

  In addition, the release agent dispersion in which the release agent particles are dispersed is also prepared by a method similar to the method for preparing the resin particle dispersion. That is, the dispersion medium, surfactant, dispersion method, volume average particle diameter, and particle content of the release agent dispersion are the same as those of the resin particle dispersion. Instead of the release agent dispersion, a release agent-containing resin particle dispersion in which the release agent is dispersed in the resin particles may be used.

-Aggregated particle formation process-
Next, the resin particle dispersion, the colorant dispersion, and the release agent dispersion are mixed.
Then, in the mixed dispersion, resin particles, colorant particles, and release agent particles are hetero-aggregated to have resin particles, colorant particles, and release agent particles having a diameter close to the diameter of the target toner particles. Aggregated particles are formed.

Specifically, for example, a flocculant is added to the mixed dispersion, and the pH of the mixed dispersion is adjusted to acidic (for example, pH 2 to 5), and a dispersion stabilizer is added as necessary. The glass particles are heated to a temperature close to the glass transition temperature (specifically, for example, the glass transition temperature of the resin particles is −30 ° C. or higher and the glass transition temperature is −10 ° C. or lower), and the particles dispersed in the mixed dispersion are agglomerated. To form aggregated particles.
In the agglomerated particle forming step, for example, the agglomerated agent is added at room temperature (for example, 25 ° C.) while stirring the mixed dispersion with a rotary shear homogenizer, and the pH of the mixed dispersion is adjusted to be acidic (for example, pH 2 to 5) In addition, heating may be performed after adding a dispersion stabilizer as necessary.

Examples of the flocculant include a surfactant having a polarity opposite to that of the surfactant contained in the mixed dispersion, such as an inorganic metal salt and a bivalent or higher-valent metal complex. When a metal complex is used as the flocculant, the amount of the flocculant used is reduced and the charging characteristics are improved.
An additive that forms a complex or similar bond with the metal ion of the flocculant may be used together with the flocculant. As this additive, a chelating agent is preferably used.

Examples of inorganic metal salts include metal salts such as calcium chloride, calcium nitrate, barium chloride, magnesium chloride, zinc chloride, aluminum chloride, and aluminum sulfate; inorganic metal salts such as polyaluminum chloride, polyaluminum hydroxide, and calcium polysulfide Polymer; and the like.
A water-soluble chelating agent may be used as the chelating agent. Examples of the chelating agent include oxycarboxylic acids such as tartaric acid, citric acid, and gluconic acid; aminocarboxylic acids such as iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), and ethylenediaminetetraacetic acid (EDTA); .
For example, the addition amount of the chelating agent is preferably 0.01 parts by mass or more and 5.0 parts by mass or less, and more preferably 0.1 parts by mass or more and less than 3.0 parts by mass with respect to 100 parts by mass of the resin particles.

-Fusion / unification process-
Next, the agglomerated particle dispersion in which the agglomerated particles are dispersed is heated to, for example, a glass transition temperature or higher of the resin particles (for example, a temperature of 10 ° C. to 30 ° C. higher than the glass transition temperature of the resin particles). Are fused and united to form toner particles.

Through the above steps, toner particles are obtained.
In addition, after obtaining the aggregated particle dispersion liquid in which the aggregated particles are dispersed, the aggregated particle dispersion liquid and the resin particle dispersion liquid in which the resin particles are dispersed are further mixed, and the resin particles are further added to the surface of the aggregated particles. A process of aggregating to adhere to form second aggregated particles, and heating the second aggregated particle dispersion in which the second aggregated particles are dispersed to fuse and coalesce the second aggregated particles. The toner particles may be manufactured through a step of forming toner particles having a core / shell structure.

After completion of the coalescence / union process, the toner particles formed in the solution are subjected to a known washing process, solid-liquid separation process, and drying process to obtain dried toner particles.
In the washing step, it is preferable to sufficiently perform substitution washing with ion-exchanged water from the viewpoint of chargeability. The solid-liquid separation step is not particularly limited, but suction filtration, pressure filtration, or the like is preferably performed from the viewpoint of productivity. Also, the drying process is not particularly limited, but from the viewpoint of productivity, freeze drying, flash jet drying, fluidized drying, vibration fluidized drying, or the like is preferably performed.

  The toner according to the exemplary embodiment is manufactured, for example, by adding an external additive to the dry toner particles and mixing them. Mixing is preferably performed by, for example, a V blender, a Henschel mixer, a Ladyge mixer, or the like. Furthermore, if necessary, coarse toner particles may be removed using a vibration classifier, a wind classifier, or the like.

Next, a method for producing toner particles by the dissolution suspension method will be described in detail.
In the dissolution suspension method, a binder resin, a colorant, and a material containing other components such as a release agent used as necessary are dissolved or dispersed in a solvent in which the binder resin can be dissolved. In this method, the liquid is granulated in an aqueous medium containing an inorganic dispersant, and then the solvent is removed to obtain toner particles.
Other components used in the dissolution suspension method include various components such as an internal additive, a charge control agent, inorganic powder (inorganic particles), and organic particles, in addition to a release agent.

  In the present embodiment, these binder resin, colorant, and other components used as necessary are dissolved or dispersed in a solvent in which the binder resin can be dissolved. Whether or not the binder resin can be dissolved depends on the components of the binder resin, the molecular chain length, the degree of three-dimensionalization, etc., so it cannot be generally stated, but in general, toluene, xylene, hexane, etc. Halogenated hydrocarbons such as hydrocarbons, methylene chloride, chloroform, dichloroethane, dichloroethylene, alcohols or ethers such as ethanol, butanol, benzyl alcohol ethyl ether, benzyl alcohol isopropyl ether, tetrahydrofuran, tetrahydropyran, methyl acetate, ethyl acetate, butyl acetate Esters such as isopropyl acetate, ketones such as acetone, methyl ethyl ketone, diisobutyl ketone, dimethyl oxide, diacetone alcohol, cyclohexanone, methylcyclohexanone, or acetals are used.

  These solvents dissolve the binder resin and do not need to dissolve the colorant and other components. The colorant and other components only need to be dispersed in the binder resin solution. Although there is no restriction | limiting in the usage-amount of a solvent, What is necessary is just a viscosity which can be granulated in an aqueous medium. 10/90 to 50/50 (the mass ratio of the former / the latter) is easily granulated and finally the ratio of the material (the former) containing the binder resin, the colorant and other components to the solvent (the latter) From the viewpoint of yield of toner particles.

  The binder resin, colorant and other component liquids (toner mother liquid) dissolved or dispersed in the solvent are granulated to have a predetermined particle size in an aqueous medium containing an inorganic dispersant. As the aqueous medium, water is mainly used. The mixing ratio of the aqueous medium and the toner mother liquid is preferably aqueous medium / mother liquid = 90/10 to 50/50 (mass ratio). The inorganic dispersant is preferably selected from tricalcium phosphate, hydroxyapatite, calcium carbonate, titanium oxide and silica powder. The amount of the inorganic dispersant used is determined according to the particle size of the granulated particles, but generally it is preferably used in the range of 0.1% by mass to 15% by mass with respect to the toner mother liquor. . When the content is 0.1% by mass or more, granulation is performed satisfactorily, and when the content is 15% by mass or less, generation of unnecessary fine particles is suppressed and target particles are obtained in a high yield.

In order to granulate the toner mother liquor in an aqueous medium containing an inorganic dispersant, an auxiliary agent may be added to the aqueous medium. Such auxiliaries include known cationic type, anionic type and nonionic type surfactants, and those of the anionic type are particularly preferred. For example, there are sodium alkylbenzene sulfonate, sodium α-olefin sulfonate, sodium alkyl sulfonate, etc., and these are used in the range of 1 × 10 ⁻⁴ mass% to 0.1 mass% with respect to the toner mother liquor. preferable.

Granulation of the toner mother liquor in an aqueous medium containing an inorganic dispersant is preferably performed under shear. The toner mother liquid dispersed in the aqueous medium is desirably granulated to have an average particle size of 15 μm or less. Particularly, it is preferably 3 μm or more and 10 μm or less.
There are various dispersers as the apparatus provided with the shearing mechanism, and among them, a homogenizer is preferable. By using a homogenizer, a substance that is incompatible with each other (in this embodiment, an aqueous medium containing an inorganic dispersant and a toner mother liquor) is passed through a gap between the casing and the rotating rotor so that the liquid is contained in a liquid. And incompatible substances can be dispersed in the form of particles. Such homogenizers include TK homomixers, line flow homomixers, auto homomixers (manufactured by Tokushu Kika Kogyo Co., Ltd.), Silverson homogenizers (manufactured by Silverson), polytron homogenizers (manufactured by KINEMATICA AG), etc. There is.

  The stirring condition using the homogenizer is preferably 2 m / sec or more in terms of the peripheral speed of the rotor blades. If it is more than this, the particle formation tends to be sufficiently performed. In the present embodiment, the solvent is removed after the toner mother liquor is granulated in an aqueous medium containing an inorganic dispersant. The removal of the solvent may be performed at room temperature (25 ° C.) and normal pressure, but since it takes a long time to remove, the removal is performed under a temperature condition that is lower than the boiling point of the solvent and has a difference from the boiling point of 80 ° C. or less. Is preferred. The pressure may be normal pressure or reduced pressure, but when reducing the pressure, it is preferably 20 mmHg or more and 150 mmHg or less.

The toner particles obtained by the dissolution suspension method are preferably washed with hydrochloric acid after removing the solvent. As a result, the inorganic dispersant remaining on the surface of the toner particles can be removed to obtain the original composition of the toner particles and improve the characteristics. Subsequently, powder toner particles can be obtained by dehydration and drying.
The toner particles obtained by the dissolution suspension method are subjected to inorganic oxidation represented by silica, titania, and aluminum oxide for the purpose of charge adjustment, fluidity provision, charge exchangeability and the like, as in the case of the aggregation and coalescence method. An article or the like may be added and adhered as an external additive. In addition to the inorganic oxides described above, other components (particles) such as a charge control agent, organic particles, a lubricant, and an abrasive may be added as external additives.

<Electrostatic image developer>
The electrostatic charge image developer according to the exemplary embodiment includes at least the toner according to the exemplary embodiment.
The electrostatic charge image developer according to this embodiment may be a one-component developer including only the toner according to this embodiment, or may be a two-component developer in which the toner and a carrier are mixed.

There is no restriction | limiting in particular as a carrier, A well-known carrier is mentioned. Examples of carriers include a coated carrier in which the surface of a core made of magnetic powder is coated with a resin; a magnetic powder-dispersed carrier in which magnetic powder is dispersed in a matrix resin; and a porous magnetic powder impregnated with resin. Resin-impregnated type carriers; conductive particle-dispersed carriers in which conductive particles are dispersed and mixed in a matrix resin; and the like.
The magnetic powder-dispersed carrier, the resin-impregnated carrier, and the conductive particle-dispersed carrier may be a carrier in which the constituent particles of the carrier are used as a core and the surface thereof is coated with a resin.

  Examples of the magnetic powder include magnetic metals such as iron, nickel, and cobalt; magnetic oxides such as ferrite and magnetite.

  Examples of the conductive particles include metals such as gold, silver, and copper; particles such as carbon black, titanium oxide, zinc oxide, tin oxide, barium sulfate, aluminum borate, and potassium titanate.

  Examples of the coating resin and matrix resin include polyethylene, polypropylene, polystyrene, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl chloride, polyvinyl ether, polyvinyl ketone, vinyl chloride-vinyl acetate copolymer, styrene-acrylic. Examples include an acid copolymer, a straight silicone resin containing an organosiloxane bond or a modified product thereof, a fluororesin, a polyester, a polycarbonate, a phenol resin, and an epoxy resin. The coating resin and the matrix resin may contain an additive such as a conductive material.

In order to coat the surface of the core material with a resin, a method of coating with a coating layer forming solution in which a coating resin and various additives (used as necessary) are dissolved in an appropriate solvent may be mentioned. The solvent is not particularly limited, and may be selected in consideration of the type of resin used, application suitability, and the like.
Specific resin coating methods include a dipping method in which a core material is immersed in a coating layer forming solution; a spray method in which the coating layer forming solution is sprayed on the surface of the core material; A fluidized bed method in which a coating layer forming solution is sprayed; a kneader coater method in which a carrier core material and a coating layer forming solution are mixed in a kneader coater, and then the solvent is removed;

  The mixing ratio (mass ratio) of the toner and the carrier in the two-component developer is preferably toner: carrier = 1: 100 to 30: 100, and more preferably 3: 100 to 20: 100.

<Image Forming Apparatus / Image Forming Method>
An image forming apparatus and an image forming method according to the present embodiment will be described.
The image forming apparatus according to the present embodiment includes an image carrier, a charging unit that charges the surface of the image carrier, an electrostatic image forming unit that forms an electrostatic image on the surface of the charged image carrier, and an electrostatic charge. Development means for containing an image developer and developing the electrostatic image formed on the surface of the image carrier as a toner image with the electrostatic image developer, and the toner image formed on the surface of the image carrier as a recording medium Transfer means for transferring to the surface of the recording medium, and fixing means for fixing the toner image transferred to the surface of the recording medium. The electrostatic charge image developer according to this embodiment is applied as the electrostatic charge image developer.

  In the image forming apparatus according to this embodiment, a charging process for charging the surface of the image carrier, an electrostatic charge image forming process for forming an electrostatic image on the surface of the charged image carrier, and an electrostatic charge according to this embodiment. A developing step of developing an electrostatic charge image formed on the surface of the image carrier as a toner image with an image developer; a transfer step of transferring the toner image formed on the surface of the image carrier to the surface of the recording medium; An image forming method (an image forming method according to the present embodiment) including a fixing step of fixing the toner image transferred onto the surface of the recording medium is performed.

The image forming apparatus according to the present embodiment is a direct transfer type apparatus that directly transfers a toner image formed on the surface of an image carrier to a recording medium; the toner image formed on the surface of the image carrier is transferred to an intermediate transfer member An intermediate transfer type apparatus that primarily transfers the toner image transferred to the surface of the intermediate transfer body and then secondary transfer the toner image to the surface of the recording medium; after the toner image is transferred, the surface of the image carrier before charging is cleaned. A known image forming apparatus such as an apparatus provided with a cleaning unit; an apparatus provided with a charge removing unit that discharges the surface of the image holding member with a discharge light before charging after transferring the toner image;
In the case of an intermediate transfer type apparatus, the transfer means includes, for example, an intermediate transfer body on which a toner image is transferred to the surface, and a primary transfer that primarily transfers the toner image formed on the surface of the image holding body to the surface of the intermediate transfer body. And a secondary transfer unit that secondarily transfers the toner image transferred onto the surface of the intermediate transfer member onto the surface of the recording medium.

  In the image forming apparatus according to the present embodiment, for example, the part including the developing unit may have a cartridge structure (process cartridge) that is detachable from the image forming apparatus. As the process cartridge, for example, a process cartridge that accommodates the electrostatic charge image developer according to this embodiment and includes a developing unit is preferably used.

  Hereinafter, an example of the image forming apparatus according to the present embodiment will be described, but the present invention is not limited to this. The main part shown in the figure will be described, and the description of other parts will be omitted.

FIG. 1 is a schematic configuration diagram illustrating an image forming apparatus according to the present embodiment, and is a diagram illustrating an image forming apparatus of a five-tandem type and an intermediate transfer type.
The image forming apparatus shown in FIG. 1 outputs an image of each color of red (R), yellow (Y), magenta (M), cyan (C), and black (K) based on the color-separated image data. Photographic first to fifth image forming units 10R, 10Y, 10M, 10C, and 10K (image forming means) are provided. These image forming units (hereinafter sometimes simply referred to as “units”) 10R, 10Y, 10M, 10C, and 10K are arranged in parallel at a predetermined distance from each other in the horizontal direction. These units 10R, 10Y, 10M, 10C, and 10K may be process cartridges that can be attached to and detached from the image forming apparatus.

Below each unit 10R, 10Y, 10M, 10C, 10K, an intermediate transfer belt (an example of an intermediate transfer member) 20 is extended through each unit. The intermediate transfer belt 20 is wound around a drive roll 22, a support roll 23, and a counter roll 24 that are in contact with the inner surface of the intermediate transfer belt 20, and travels in a direction from the first unit 10R to the fifth unit 10K. It is supposed to be. An intermediate transfer member cleaning device 21 is provided on the image holding surface side of the intermediate transfer belt 20 so as to face the drive roll 22.
Each unit 10R, 10Y, 10M, 10C, and 10K developing device (an example of a developing unit) 4R, 4Y, 4M, 4C, and 4K has red toner contained in toner cartridges 8R, 8Y, 8M, 8C, and 8K. , Yellow, magenta, cyan, and black toners are supplied.

  Since the first to fifth units 10R, 10Y, 10M, 10C, and 10K have the same configuration, operation, and operation, the red image disposed on the upstream side in the intermediate transfer belt traveling direction is here. The first unit 10 </ b> R that forms the above will be described as a representative.

The first unit 10R includes a photoreceptor 1R that functions as an image carrier. Around the photoconductor 1R, a charging roll (an example of a charging unit) 2R that charges the surface of the photoconductor 1R to a predetermined potential, and the charged surface is exposed by a laser beam based on a color-separated image signal. An exposure device (an example of an electrostatic charge image forming unit) 3R that forms an electrostatic charge image, a developing device (an example of a developing unit) 4R that supplies toner to the electrostatic charge image and develops the electrostatic image, and a developed toner image A primary transfer roll (an example of a primary transfer unit) 5R that transfers onto the intermediate transfer belt 20 and a photoconductor cleaning device (an example of a cleaning unit) 6R that removes toner remaining on the surface of the photoconductor 1R after the primary transfer are sequentially arranged. Has been.
The primary transfer roll 5R is disposed inside the intermediate transfer belt 20, and is provided at a position facing the photoreceptor 1R. A bias power source (not shown) for applying a primary transfer bias is connected to the primary transfer rolls 5R, 5Y, 5M, 5C, and 5K of each unit. Each bias power source changes the value of the transfer bias applied to each primary transfer roll under the control of a control unit (not shown).

Hereinafter, an operation of forming a red image in the first unit 10R will be described.
First, prior to the operation, the surface of the photoreceptor 1R is charged to a potential of −600V to −800V by the charging roll 2R.
The photoreceptor 1R is formed by laminating a photosensitive layer on a conductive substrate (for example, a volume resistivity of 1 × 10 ⁻⁶ Ωcm or less at 20 ° C.). This photosensitive layer usually has a high resistance (general resin resistance), but has a property of changing the specific resistance of the portion irradiated with the laser beam when irradiated with the laser beam. Therefore, a laser beam is irradiated from the exposure device 3R on the surface of the charged photoreceptor 1R according to red image data sent from a control unit (not shown). Thereby, an electrostatic charge image of a red image pattern is formed on the surface of the photoreceptor 1R.

An electrostatic charge image is an image formed on the surface of the photoreceptor 1R by charging. The specific resistance of the irradiated portion of the photosensitive layer is lowered by the laser beam from the exposure device 3R, and the surface of the photoreceptor 1R is charged. This is a so-called negative latent image formed by the remaining charge flowing, while the charge remaining in the portion not irradiated with the laser beam remains.
The electrostatic charge image formed on the photoreceptor 1R rotates to a predetermined development position as the photoreceptor 1R travels. At this development position, the electrostatic charge image on the photoreceptor 1R is developed and visualized as a toner image by the developing device 4R.

  In the developing device 4R, for example, an electrostatic charge image developer containing at least red toner and a carrier is accommodated. The red toner is triboelectrically charged by being agitated inside the developing device 4R, has a charge of the same polarity (negative polarity) as the charged electric charge on the photoreceptor 1R, and has a developer roll (a developer holding member). Example) is held on. As the surface of the photoreceptor 1R passes through the developing device 4R, the red toner is electrostatically attached to the latent image portion on the surface of the photoreceptor 1R, and the latent image is developed with the red toner. . The photoconductor 1R on which the red toner image is formed continues to run at a predetermined speed, and the toner image developed on the photoconductor 1R is conveyed to a predetermined primary transfer position.

When the red toner image on the photoconductor 1R is conveyed to the primary transfer position, a primary transfer bias is applied to the primary transfer roll 5R, and an electrostatic force from the photoconductor 1R toward the primary transfer roll 5R acts on the toner image, so that The toner image on the body 1R is transferred onto the intermediate transfer belt 20. The transfer bias applied at this time is a (+) polarity opposite to the polarity (−) of the toner, and is controlled to, for example, +10 μA by the control unit (not shown) in the first unit 10R.
On the other hand, the toner remaining on the photoreceptor 1R is removed and collected by the photoreceptor cleaning device 6R.

The primary transfer bias applied to the primary transfer rolls 5Y, 5M, 5C, and 5K after the second unit 10Y is also controlled according to the first unit.
Thus, the intermediate transfer belt 20 to which the red toner image is transferred by the first unit 10R is sequentially conveyed through the second to fifth units 10Y, 10M, 10C, and 10K, and the toner images of the respective colors are superimposed to perform multiple transfer. Is done.

  The intermediate transfer belt 20 on which the toner images of five colors are multiplex-transferred through the first to fifth units includes an intermediate transfer belt 20, an opposing roll 24 in contact with the inner surface of the intermediate transfer belt, and an image holding surface of the intermediate transfer belt 20. To a secondary transfer portion composed of a secondary transfer roll (an example of secondary transfer means) 26 arranged on the side. On the other hand, recording paper (an example of a recording medium) P is fed at a predetermined timing into a gap where the secondary transfer roll 26 and the intermediate transfer belt 20 are in contact with each other via a supply mechanism, and the secondary transfer bias is opposed to the opposing roll. 24. The transfer bias applied at this time is a (−) polarity that is the same polarity as the polarity (−) of the toner, and an electrostatic force from the intermediate transfer belt 20 toward the recording paper P acts on the toner image, and the transfer bias is applied to the intermediate transfer belt 20. The toner image is transferred onto the recording paper P. The secondary transfer bias at this time is determined according to the resistance detected by a resistance detection means (not shown) for detecting the resistance of the secondary transfer portion, and is voltage-controlled.

  Thereafter, the recording paper P is sent to a pressure contact portion (nip portion) of a pair of fixing rolls in a fixing device (an example of a fixing unit) 28, and the toner image is fixed on the recording paper P to form a fixed image. .

Examples of the recording paper P to which the toner image is transferred include plain paper used in electrophotographic copying machines, printers, and the like. As the recording medium, in addition to the recording paper P, an OHP sheet and the like are also included.
In order to further improve the smoothness of the image surface after fixing, it is preferable that the surface of the recording paper P is also smooth. For example, coated paper in which the surface of plain paper is coated with resin, art paper for printing, etc. Preferably used.

  The recording paper P on which the color image has been fixed is carried out toward the discharge unit, and a series of color image forming operations is completed.

<Process cartridge / toner cartridge>
The process cartridge according to this embodiment will be described.
The process cartridge according to the present embodiment accommodates the electrostatic image developer according to the present embodiment, and develops the electrostatic image formed on the surface of the image carrier as a toner image by the electrostatic image developer. And a process cartridge that can be attached to and detached from the image forming apparatus.

  Note that the process cartridge according to the present embodiment is not limited to the above-described configuration, and other means such as a developing device and other units such as an image carrier, a charging unit, an electrostatic charge image forming unit, and a transfer unit, if necessary. And at least one selected from the above.

  Hereinafter, an example of the process cartridge according to the present embodiment will be shown, but the present invention is not limited to this. The main part shown in the figure will be described, and the description of other parts will be omitted.

FIG. 2 is a schematic configuration diagram showing a process cartridge according to the present embodiment.
The process cartridge 200 shown in FIG. 2 is provided around the photoconductor 107 and the photoconductor 107 by, for example, a housing 117 provided with an attachment rail 116 and an opening 118 for exposure. A charging roller 108 (an example of a charging unit), a developing device 111 (an example of a developing unit), and a photoconductor cleaning device 113 (an example of a cleaning unit) are integrally combined and held to form a cartridge. Yes.
In FIG. 2, 109 is an exposure device (an example of an electrostatic charge image forming unit), 112 is a transfer device (an example of a transfer unit), 115 is a fixing device (an example of a fixing unit), and 300 is a recording paper (a recording medium). An example).

Next, the toner cartridge according to this embodiment will be described.
The toner cartridge according to the present exemplary embodiment is a toner cartridge that accommodates the toner according to the present exemplary embodiment and is detachable from the image forming apparatus. The toner cartridge contains toner for replenishment to be supplied to the developing means provided in the image forming apparatus.

  The image forming apparatus shown in FIG. 1 is an image forming apparatus having a configuration in which toner cartridges 8R, 8Y, 8M, 8C, and 8K are attached and detached, and the developing devices 4R, 4Y, 4M, 4C, and 4K have different colors. A corresponding toner cartridge is connected to the toner supply pipe (not shown). Further, when the amount of toner stored in the toner cartridge becomes low, the toner cartridge is replaced.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist thereof.

In the following, “part” is based on mass unless otherwise specified.
In addition, C.I. I. Pigment Orange 38 is referred to as “PO38”, and C.I. I. Pigment Red 185 is referred to as “PR185” and C.I. I. Pigment Red 122 is referred to as “PR122”.

<Measurement method of each physical property>
[Weight average molecular weight of resin]
The weight average molecular weight of the resin was calculated from the result of molecular weight measurement by gel permeation chromatography (GPC) using the following measuring apparatus and the molecular weight calibration curve of a monodisperse polystyrene standard sample.
-Measuring device: HLC-8120 (manufactured by Tosoh Corporation)
Column: TSKgel SuperHM-M (manufactured by Tosoh Corporation)
・ Eluent: Tetrahydrofuran

[Acid value of the resin]
The acid value of the resin was measured by a neutralization titration method according to JIS K0070-1992.

[Glass transition temperature of resin]
The glass transition temperature of the resin was determined from the DSC curve obtained by differential scanning calorimetry (DSC) according to JIS K7121-1987 “Method for measuring plastic transition temperature” as described above.

[Volume average particle diameter of resin particles and toner particles]
The method for measuring the volume average particle diameter of the resin particles and toner particles is as follows.

-When the particle size is 2 µm or more-
Sample for measurement: 0.5 mg or more and 50 mg or less of particles are added to 2 mL of a 5% by mass aqueous solution of sodium dodecylbenzenesulfonate (surfactant), and this is added to an electrolytic solution (ISOTON-II manufactured by Beckman Coulter, Inc.) of 100 mL or more and 150 mL or less. And dispersion treatment was performed for 1 minute with an ultrasonic disperser.
Measuring device: Coulter Multisizer II type (manufactured by Beckman-Coulter), aperture diameter 100 μm.
Using the above measurement sample and measurement apparatus, the particle size of 50,000 particles of 2 μm or more and 60 μm or less was measured, and the volume average particle size distribution was determined from the particle size distribution.
Based on the particle size distribution, a cumulative distribution of the volume was drawn from the smaller diameter side with respect to the divided particle size range (channel), and the particle size at which the accumulation was 50% was defined as the volume average particle size.

-When the particle size is less than 2 µm-
Sample for measurement: Ion exchange water was added to the particle dispersion to adjust the solid content to about 10% by mass.
Measuring device: Laser diffraction particle size distribution measuring device (LS13320 manufactured by Beckman-Coulter)
The above measurement sample was put into a cell until an appropriate concentration was reached, and the measurement was performed when the scattering intensity reached a sufficient value. Based on the obtained particle size distribution, a cumulative distribution of the volume was drawn from the smaller diameter side with respect to the divided particle size range (channel), and the particle size at which 50% of the particles accumulated reached the volume average particle size.

<Preparation of resin particle dispersion>
[Preparation of resin particle dispersion (1)]
• 30 mol parts of terephthalic acid • 70 mol parts of fumaric acid • 5 mol parts of bisphenol A ethylene oxide adduct • 95 mol parts of bisphenol A propylene oxide adduct Content containing a stirrer, nitrogen inlet tube, temperature sensor, and rectifying column The above material was charged into a 5 liter flask, and the temperature was raised to 220 ° C. over 1 hour, and 1 part of titanium tetraethoxide was added to 100 parts of the material. The temperature was raised to 230 ° C. over 0.5 hours while distilling off the produced water, and the dehydration condensation reaction was continued at that temperature for 1 hour, and then the reaction product was cooled. Thus, a polyester resin (1) having a weight average molecular weight of 18,000, an acid value of 15 mgKOH / g, and a glass transition temperature of 60 ° C. was synthesized.

In a container equipped with temperature control means and nitrogen replacement means, 40 parts of ethyl acetate and 25 parts of 2-butanol are added to make a mixed solvent, and then 100 parts of polyester resin (1) is gradually added and dissolved therein. A 10% by mass aqueous ammonia solution (corresponding to 3 times the molar ratio with respect to the acid value of the resin) was added and stirred for 30 minutes.
Next, the inside of the container was replaced with dry nitrogen, the temperature was kept at 40 ° C., and 400 parts of ion-exchanged water was added dropwise at a rate of 2 parts / minute while stirring the mixed solution to carry out emulsification. After completion of the dropwise addition, the emulsion is returned to room temperature (20 ° C. to 25 ° C.), and stirred for 48 hours with dry nitrogen to reduce ethyl acetate and 2-butanol to 1,000 ppm or less. A resin particle dispersion in which resin particles having a diameter of 200 nm were dispersed was obtained. Ion exchange water was added to the resin particle dispersion to adjust the solid content to 20% by mass to obtain a resin particle dispersion (1).

[Preparation of resin particle dispersion (2)]
・ Styrene 310 parts ・ n-butyl acrylate 100 parts ・ β-carboxyethyl acrylate 9 parts ・ 1,10-decanediol diacrylate 1.5 parts ・ dodecanethiol 3 parts Anionic surfactant (manufactured by Dow Chemical Company) A solution obtained by dissolving 4 parts of Dowfax in 550 parts of ion-exchanged water was added, and a mixed liquid in which the above raw materials were mixed was added and emulsified. While slowly stirring the emulsion for 10 minutes, 50 parts of ion-exchanged water in which 6 parts of ammonium persulfate had been dissolved was added. Next, after sufficiently replacing the nitrogen in the system, the flask was heated with an oil bath while stirring until the temperature in the system reached 75 ° C., and the emulsion polymerization was continued for 4 hours as it was. As a result, a resin particle dispersion in which resin particles having a weight average molecular weight of 33,000, a glass transition temperature of 53 ° C., and a volume average particle size of 250 nm were dispersed was obtained. Ion exchange water was added to the resin particle dispersion to adjust the solid content to 20% by mass to obtain a resin particle dispersion (2).

<Preparation of colorant dispersion>
[Preparation of Colorant Dispersion (1)]
・ PO38 (NovopermRedHFG manufactured by Clariant Japan Co., Ltd.) 70 parts ・ Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., Neogen RK) 1 part ・ Ion-exchanged water 200 parts The above materials were mixed and homogenizer (manufactured by IKA) Dispersion was carried out for 10 minutes using an ultra turrax T50). Ion exchange water was added so that the solid content in the dispersion was 20% by mass, and a colorant dispersion (1) in which colorant particles having a volume average particle size of 190 nm were dispersed was obtained.

[Preparation of Colorant Dispersion (2)]
-PR185 (NovopermCarmine HF4C-N VP502 manufactured by Clariant Japan Co., Ltd.) 70 parts-Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., Neogen RK) 1 part-Ion-exchanged water 200 parts The above materials are mixed and a homogenizer ( Dispersion was carried out for 10 minutes using IKA Ultra Turrax T50). Ion exchanged water was added so that the solid content in the dispersion was 20% by mass to obtain a colorant dispersion (2) in which colorant particles having a volume average particle size of 190 nm were dispersed.

[Preparation of Colorant Dispersion (3)]
・ PR122 (Chromofine Magenta 6887 manufactured by Dainichi Seika Kogyo Co., Ltd.) 70 parts ・ Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., Neogen RK) 1 part ・ Ion-exchanged water 200 parts The above materials are mixed, The mixture was dispersed for 10 minutes using a homogenizer (Ultra Tarrax T50 manufactured by IKA). Ion exchange water was added so that the solid content in the dispersion was 20% by mass, and a colorant dispersion (3) in which colorant particles having a volume average particle size of 190 nm were dispersed was obtained.

<Preparation of release agent dispersion>
[Preparation of release agent dispersion (1)]
-Paraffin wax (Nippon Seiwa Co., Ltd. HNP-9) 100 parts-Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd. Neogen RK) 1 part-Ion exchange water 350 parts The mixture was heated to 0 ° C. and dispersed using a homogenizer (Ultra Tarax T50 manufactured by IKA), and then dispersed using a Menton Gorin high-pressure homogenizer (manufactured by Gorin), whereby release agent particles having a volume average particle size of 200 nm were dispersed. A release agent dispersion (1) (solid content: 20% by mass) was obtained.

<Example 1>
(Preparation of toner particles)
-Resin particle dispersion (1) 305 parts-Colorant dispersion (1) (PO38) 34 parts-Colorant dispersion (2) (PR185) 11 parts-Release agent dispersion (1) 50 parts-Anionic Surfactant (TaycaPower) 2 parts The above material is placed in a round stainless steel flask, 0.1N nitric acid is added to adjust the pH to 3.5, and then an aqueous nitric acid solution having a polyaluminum chloride concentration of 10% by mass 30 Parts were added. Subsequently, the mixture was dispersed at 30 ° C. using a homogenizer (Ultra Turrax T50 manufactured by IKA), then heated to 45 ° C. in a heating oil bath and held for 30 minutes. Thereafter, 100 parts of the resin particle dispersion (1) was slowly added and held for 1 hour, and the pH was adjusted to 8.5 by adding a 0.1N sodium hydroxide aqueous solution. And heated for 5 hours. Thereafter, the mixture was cooled to 20 ° C. at a rate of 20 ° C./min, filtered, sufficiently washed with ion exchange water, and dried to obtain toner particles (1) having a volume average particle diameter of 7.5 μm.

(Preparation of external toner)
Toner (1) was obtained by mixing 100 parts of toner particles (1) and 0.7 parts of dimethyl silicone oil-treated silica particles (RY200 manufactured by Nippon Aerosil Co., Ltd.) using a Henschel mixer.

  When the external additive was removed from the toner (1) and the contents of PO38 and PR185 contained in the toner particles were measured by the method described above, the PO38 content was 6.8% by mass and the PR185 content was 2. It was 2% by mass.

(Preparation of developer)
・ Ferrite particles (average particle size 50 μm) 100 parts ・ Toluene 14 parts ・ Styrene / methyl methacrylate copolymer (copolymerization ratio 15/85) 2 parts ・ Carbon black 0.2 parts A carrier was obtained by dispersing to prepare a dispersion, putting the dispersion together with ferrite particles in a vacuum degassing kneader, and drying under reduced pressure while stirring.
To 100 parts of the carrier, 5 parts of toner (1) was mixed to obtain developer (1).

[Evaluation of color reproducibility]
The following operations, image formation, and measurement were performed in an environment of temperature 25 ° C./humidity 60%.
As an image forming apparatus for forming an image for evaluation, DocuCenter Color 400 CP manufactured by Fuji Xerox Co., Ltd. was prepared, and developer (1) was put in a developing device, and toner (1) was put in a toner cartridge.
Then, a monochromatic 100% density image (size 5 cm × 5 cm, toner paste amount 4.5 g / m ² ) was formed on the coated paper (OS coated paper W manufactured by Fuji Xerox Co., Ltd.).

The L ^* value, a ^* value, and b ^* value in the CIE 1976 L ^* a ^* b ^* color system of the formed image are arbitrarily measured at 10 locations using X-Rite 939 (aperture diameter 4 mm) manufactured by X-Rite. Then, an average value of L ^* value, a ^* value and b ^* value was calculated.
In the same manner as above, L ^* value, a ^* value, and b ^* value were measured for PANTONE 1788C (coated paper) of a commercially available color sample (PANTONE FORMULA GUIDE Solid Coated), and the average value was calculated. As a result, L ₁ = 54.2, a ₁ = 73.3, and b ₁ = 45.4.
Then, based on the following equation, a color difference ΔE between the formed image and PANTONE 1788C was calculated. The results are shown in Table 2.

L ₁ , a ₁ , and b ₁ are L ^* values, a ^* values, and b ^* values of PANTONE 1788C, and L ₂ , a ₂ , and b ₂ are L ^* values, a ^* values, and b of the image of the example. ^* Value.

<Examples 2-72>
(Preparation of toner particles)
In the same manner as in Example 1, except that the respective amounts of the resin particle dispersion and the colorant dispersion are adjusted so that the respective contents of PO38 and PR185 are as shown in Table 1, so that the toner particles (2) To (72) was obtained.

(Preparation of external toner)
Toners (2) to (72) were obtained in the same manner as in the preparation of toner (1) except that toner particles (2) to (72) were used instead of toner particles (1).

(Preparation of developer)
Developers (2) to (72) were obtained in the same manner as in the preparation of developer (1) except that toners (2) to (72) were used instead of toner (1).

[Evaluation of color reproducibility]
Evaluation similar to the evaluation of color reproducibility in Example 1 was performed using toners (2) to (72) and developers (2) to (72) instead of toner (1) and developer (1). It was. The results are shown in Table 2.

In Examples 1 to 72, ΔE was less than 9.
In Examples 1 to 31 (at least one of the condition (B1) and the condition (B2) is satisfied), ΔE was less than 5.
In Examples 1 to 15 (which satisfies the condition (C)), ΔE was less than 4.

<Example 101>
(Preparation of toner particles)
-Resin particle dispersion (2) 405 parts-Colorant dispersion (1) (PO38) 34 parts-Colorant dispersion (2) (PR185) 11 parts-Release agent dispersion (1) 50 parts The mixture was placed in a round stainless steel flask and thoroughly mixed and dispersed with a homogenizer (Ultra Turrax T50 manufactured by IKA). Next, 0.5 part of polyaluminum chloride was added, and the dispersing operation was continued with a homogenizer. Then, it heated to 50 degreeC, stirring with the oil bath for heating, and hold | maintained at 50 degreeC for 60 minutes. Thereafter, the pH of the system was adjusted to 5.5 with a 0.5N sodium hydroxide aqueous solution, the flask was sealed, heated to 95 ° C. while continuing stirring using a magnetic seal, and maintained for 5 hours. After completion of the reaction, the mixture was cooled, filtered, thoroughly washed with ion exchange water, and then subjected to solid-liquid separation by Nutsche suction filtration. This was further redispersed in 3 L of ion-exchanged water at 40 ° C., and stirred and washed at 300 rpm for 15 minutes. This was repeated 5 times, and when the pH of the filtrate reached 6.6 and the electric conductivity was 12 μS / cm, solid-liquid separation was performed using No5A filter paper by Nutsche suction filtration. Vacuum drying was then continued for 12 hours. Thus, toner particles (101) having a volume average particle diameter of 7.5 μm were obtained.

(Preparation of external toner)
The toner (101) was obtained in the same manner as in the preparation of the toner (1) except that the toner particles (101) were used instead of the toner particles (1).

(Preparation of developer)
The developer (101) was obtained in the same manner as in the preparation of the developer (1) except that the toner (101) was used instead of the toner (1).

[Evaluation of color reproducibility]
Evaluation similar to the evaluation of color reproducibility in Example 1 was performed using toner (101) and developer (101) instead of toner (1) and developer (1). The results are shown in Table 3.

<Example 102>
(Preparation of toner particles)
-Polyester resin (1) 405 parts-PO38 (NovopermRedHFG manufactured by Clariant Japan) 34 parts-PR185 (Novoperm Carmine HF4C-N VP502 manufactured by Clariant Japan) 11 parts-Paraffin wax (HNP-9 manufactured by Nippon Seiwa Co., Ltd.) 50 parts The above materials were kneaded with an extruder, pulverized with a surface pulverizer, and fine particles and coarse particles were classified with a wind classifier to obtain toner particles (102) having a volume average particle diameter of 7.5 μm. .

(Preparation of external toner)
The toner (102) was obtained in the same manner as the preparation of the toner (1) except that the toner particles (102) were used instead of the toner particles (1).

(Preparation of developer)
The developer (102) was obtained in the same manner as in the preparation of the developer (1) except that the toner (102) was used instead of the toner (1).

[Evaluation of color reproducibility]
Evaluation similar to the evaluation of color reproducibility in Example 1 was performed using the toner (102) and the developer (102) instead of the toner (1) and the developer (1). The results are shown in Table 3.

<Example 103>
(Preparation of toner particles)
-Pigment dispersion (A)-
-PO38 (NovopermRedHFG manufactured by Clariant Japan Co., Ltd.) 20 parts-Ethyl acetate 80 parts The above materials were dispersed using a sand mill to obtain a pigment dispersion (A).

-Pigment dispersion (B)-
-PR185 (NovopermCarmine HF4C-N VP502 manufactured by Clariant Japan) 20 parts-Ethyl acetate 80 parts The above material was dispersed using a sand mill to obtain a pigment dispersion (B).

-Release agent dispersion (A)-
-Paraffin wax (Nippon Seiwa Co., Ltd. HNP-9) 20 parts-Ethyl acetate 80 parts The above materials were dispersed in a state cooled to 10 ° C using a DCP mill to obtain a release agent dispersion (A). .

-Liquid C-
-Polyester resin (1) 81 parts-Pigment dispersion (A) (PO38) 34 parts-Pigment dispersion (B) (PR185) 11 parts-Release agent dispersion (A) 50 parts-Ethyl acetate 324 parts Were mixed and stirred to obtain liquid C.

-Liquid D-
-Calcium carbonate dispersion (calcium carbonate: water = 40 parts: 60 parts) 124 parts-2% by weight aqueous solution of Serogen BS-H (Daiichi Kogyo Seiyaku Co., Ltd.) 99 parts-Water 277 parts The above materials are mixed and stirred. , D solution.

  500 parts of liquid C and 500 parts of liquid D were mixed and stirred to obtain a suspension. The suspension was stirred with a propeller-type stirrer for 48 hours to remove the solvent. Next, hydrochloric acid was added to remove calcium carbonate, followed by washing with water, drying and classification to obtain toner particles (103) having a volume average particle diameter of 7.5 μm.

(Preparation of external toner)
The toner (103) was obtained in the same manner as in the preparation of the toner (1) except that the toner particles (103) were used instead of the toner particles (1).

(Preparation of developer)
The developer (103) was obtained in the same manner as in the preparation of the developer (1) except that the toner (103) was used instead of the toner (1).

[Evaluation of color reproducibility]
Evaluation similar to the evaluation of color reproducibility in Example 1 was performed using toner (103) and developer (103) instead of toner (1) and developer (1). The results are shown in Table 3.

<Example 104>
(Preparation of toner particles)
As in Example 1, except that the colorant dispersion (3) was also used, and the amounts of the resin particle dispersion and the colorant dispersion were adjusted so that the content of each pigment was as shown in Table 3. The toner particles (104) were obtained by adjusting.

(Preparation of external toner)
The toner (104) was obtained in the same manner as the preparation of the toner (1) except that the toner particles (104) were used instead of the toner particles (1).

(Preparation of developer)
The developer (104) was obtained in the same manner as in the preparation of the developer (1) except that the toner (104) was used instead of the toner (1).

[Evaluation of color reproducibility]
Evaluation similar to the evaluation of color reproducibility in Example 1 was performed using the toner (104) and the developer (104) instead of the toner (1) and the developer (1). The results are shown in Table 3.

<Example 105>
(Preparation of toner particles)
-Polyester resin (1) 305 parts-PO38 (NovopermRedHFG manufactured by Clariant Japan) 34 parts-PR185 (NovopermCarmine HF4C-N VP502 manufactured by Clariant Japan) 11 parts-Paraffin wax (HNP-9 manufactured by Nippon Seiwa Co., Ltd.) 50 parts・ Silica (RX50, manufactured by Nippon Aerosil Co., Ltd.) 100 parts The above materials are kneaded with an extruder, pulverized with a surface pulverizer, and fine particles and coarse particles are classified with a wind classifier. Toner particles (105) having a diameter of 7.5 μm were obtained.

(Preparation of external toner)
The toner (105) was obtained in the same manner as the preparation of the toner (1) except that the toner particles (105) were used instead of the toner particles (1).

(Preparation of developer)
The developer (105) was obtained in the same manner as in the preparation of the developer (1) except that the toner (105) was used instead of the toner (1).

[Evaluation of color reproducibility]
Evaluation similar to the evaluation of color reproducibility in Example 1 was performed using toner (105) and developer (105) instead of toner (1) and developer (1). The results are shown in Table 3.

<Example 106>
(Preparation of toner particles)
-Polyester resin (1) 300 parts-PO38 (NovopermRedHFG manufactured by Clariant Japan) 34 parts-PR185 (NovopermCarmine HF4C-N VP502 manufactured by Clariant Japan) 11 parts-PR122 (Chromofine Magenta 6887 manufactured by Dainichi Chemical Industries) 5 parts Paraffin wax (HNP-9 manufactured by Nippon Seiwa Co., Ltd.) 50 parts / Silica (RX50 manufactured by Nippon Aerosil Co., Ltd.) 100 parts The above materials are kneaded with an extruder and pulverized with a surface pulverizer. Fine particles and coarse particles were classified by a formula classifier to obtain toner particles (106) having a volume average particle size of 7.5 μm.

(Preparation of external toner)
The toner (106) was obtained in the same manner as the preparation of the toner (1) except that the toner particles (106) were used instead of the toner particles (1).

(Preparation of developer)
The developer (106) was obtained in the same manner as in the preparation of the developer (1) except that the toner (106) was used instead of the toner (1).

[Evaluation of color reproducibility]
Evaluation similar to the evaluation of color reproducibility in Example 1 was performed using toner (106) and developer (106) instead of toner (1) and developer (1). The results are shown in Table 3.

<Comparative Examples 1-7>
(Preparation of toner particles)
In the same manner as in Example 1, except that the amounts of the resin particle dispersion and the colorant dispersion are adjusted so that the content of each pigment is as shown in Table 3, and toner particles (C1) to ( C7) was obtained.

(Preparation of external toner)
Toners (C1) to (C7) were obtained in the same manner as in the preparation of the toner (1) except that the toner particles (C1) to (C7) were used instead of the toner particles (1).

(Preparation of developer)
Developers (C1) to (C7) were obtained in the same manner as in the preparation of developer (1) except that toners (C1) to (C7) were used instead of toner (1).

[Evaluation of color reproducibility]
Evaluation similar to the evaluation of color reproducibility in Example 1 was performed using toners (C1) to (C7) and developers (C1) to (C7) instead of toner (1) and developer (1). It was. The results are shown in Table 3.

10R, 10Y, 10M, 10C, 10K Image forming unit 1R, 1Y, 1M, 1C, 1K Photosensitive member (an example of an image carrier)
2R, 2Y, 2M, 2C, 2K charging roll (an example of charging means)
3R, 3Y, 3M, 3C, 3K exposure apparatus (an example of electrostatic charge image forming means)
4R, 4Y, 4M, 4C, 4K developing device (an example of developing means)
5R, 5Y, 5M, 5C, 5K primary transfer roll (an example of primary transfer means)
6R, 6Y, 6M, 6C, 6K Photoconductor cleaning device (an example of cleaning means)
8R, 8Y, 8M, 8C, 8K Toner cartridge 20 Intermediate transfer belt (an example of an intermediate transfer member)
21 Intermediate transfer member cleaning device 22 Drive roll 23 Support roll 24 Opposing roll 26 Secondary transfer roll (an example of secondary transfer means)
28 Fixing device (an example of fixing means)
P Recording paper (an example of a recording medium)

107 photoconductor (an example of an image carrier)
108 Charging roll (an example of charging means)
109 Exposure apparatus (an example of electrostatic charge image forming means)
111 Developing device (an example of developing means)
112 Transfer device (an example of transfer means)
113 photoconductor cleaning device (an example of cleaning means)
115 Fixing device (an example of fixing means)
116 Mounting rail 117 Housing 118 Opening 200 for exposure Process cartridge 300 Recording paper (an example of a recording medium)

Claims (9)

Toner particles containing a binder resin and a colorant and satisfying the following condition (A):
A toner for developing an electrostatic charge image, which is a red toner.
Condition (A): C.I. I. Pigment Orange 38 has a content of 5.7% by mass to 8.1% by mass, and C.I. I. The content ratio of Pigment Red 185 is 1.7% by mass or more and 2.9% by mass or less. 2. The electrostatic charge image developing toner according to claim 1, wherein a color difference ΔE between an image formed on the coated paper with the electrostatic charge image developing toner and a color sample recorded on the coated paper, PANTONE 1788C, is less than 9. 3. . The electrostatic image developing toner according to claim 1 , wherein the toner particles satisfy at least one of the following condition (B1) and condition (B2).
Condition (B1): C.I. I. Pigment Orange 38 content is 6.3 mass% or more and 7.3 mass% or less, and C.I. I. The content ratio of Pigment Red 185 is 1.7% by mass or more and 2.7% by mass or less.
Condition (B2): C.I. I. Pigment Orange 38 has a content of 6.1% by mass to 7.5% by mass, and C.I. I. The content rate of Pigment Red 185 is 1.9% by mass or more and 2.5% by mass or less. The electrostatic charge image developing toner according to claim 1, wherein the toner particles satisfy the following condition (C).
Condition (C): C.I. I. Pigment Orange 38 content is 6.3 mass% or more and 7.3 mass% or less, and C.I. I. The content rate of Pigment Red 185 is 1.9% by mass or more and 2.5% by mass or less. Electrostatic image developer comprising a toner according to any one of claims 1 to 4. Containing the toner for developing an electrostatic charge image according to any one of claims 1 to 4 ,
A toner cartridge to be attached to and detached from the image forming apparatus. A developing means for containing the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the surface of the image carrier as a toner image by the electrostatic charge image developer,
A process cartridge attached to and detached from the image forming apparatus. An image carrier,
Charging means for charging the surface of the image carrier;
An electrostatic charge image forming means for forming an electrostatic charge image on the surface of the charged image carrier;
Developing means for containing the electrostatic charge image developer according to claim 5 and developing the electrostatic charge image formed on the surface of the image carrier as a toner image by the electrostatic charge image developer;
Transfer means for transferring a toner image formed on the surface of the image carrier to the surface of a recording medium;
Fixing means for fixing the toner image transferred to the surface of the recording medium;
An image forming apparatus comprising: A charging step for charging the surface of the image carrier;
An electrostatic charge image forming step of forming an electrostatic charge image on the surface of the charged image carrier;
A developing step of developing an electrostatic image formed on the surface of the image carrier as a toner image by the electrostatic image developer according to claim 5 ;
A transfer step of transferring a toner image formed on the surface of the image carrier to the surface of a recording medium;
A fixing step of fixing the toner image transferred to the surface of the recording medium;
An image forming method comprising: