TW201443585A - Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method - Google Patents

Abstract

The present invention provides an electrostatic charge image developing toner having excellent PANTONE Warm Red C color reproducibility. The electrostatic charge image developing toner comprises adhesive resin and colorant, and has toner particles satisfying the following condition (A). Condition (A): A mass percentage of C.I. pigment orange 38 is greater than 6.3 mass percentage and smaller than 8.1 mass percentage, and a mass percentage of C.I. pigment red 185 is greater than 0.7 mass percentage and smaller than 1.7 mass percentage.

Description

Toner for electrostatic charge development, electrostatic charge developer, toner cartridge, treatment crucible, image forming apparatus, and image forming method

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

Image formation by electrophotography generally uses yellow (Y), magenta (M), cyan (C), and black (K) 4 color toners to reproduce colors. Further, in order to reproduce a color that is hard to be reproduced only by the above-described four-color toner (YMCK), a toner of a color other than YMCK may be used.

For example, Patent Document 1 discloses a light magenta toner containing a magenta colorant and a colorant for color tone adjustment for absorbing light at a wavelength of about 400 nm to about 500 nm.

Further, Patent Document 2 discloses a red toner which uses C.I. reduced red 41 as a color material.

Further, Patent Document 3 discloses an orange toner containing C.I. Pigment Orange 38.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-150336

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2011-242431

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2012-68581

An object of the present invention is to provide a toner for electrostatic charge development which is excellent in color reproducibility of PANTONE Warm Red C.

The above problems can be solved by the following means. In the first aspect of the invention, the toner for electrostatic charge development contains toner particles, and the toner particles contain a binder resin and a coloring agent, and satisfy the following condition (A). The condition (A): C.I. The content of the pigment orange 38 is 6.3% by mass or more and 8.1% by mass or less, and the content of the C.I. Pigment Red 185 is 0.7% by mass or more and less than 1.7% by mass.

According to a second aspect of the present invention, in the toner for electrostatic charge development of the first aspect of the invention, the toner particles satisfy at least one of the following conditions (B1) and (B2).

Condition (B1): The content of CI Pigment Orange 38 is 6.7% by mass or more and 7.7% by mass or less, and the content of CI Pigment Red 185 is 0.9% by mass or more and less than 1.7% by mass; Condition (B2): CI Pigment The content of the orange 38 is 6.5% by mass or more and 7.9% by mass or less, and the content of the CI Pigment Red 185 is 1.1% by mass or more and 1.5% by mass or less.

According to a third aspect of the invention, in the toner for electrostatic charge development of the first aspect of the invention, the toner particles satisfy the following condition (C).

The condition (C): C.I. The content of the pigment orange 38 is 6.7% by mass or more and 7.7% by mass or less, and the content of the C.I. Pigment Red 185 is 1.1% by mass or more and 1.5% by mass or less.

According to a fourth aspect of the present invention, the electrostatic charge developing method of the first aspect of the invention In the toner, the content of the binder resin in the toner particles is 40% by mass or more and 93% by mass or less.

According to a fifth aspect of the invention, the toner for electrostatic charge development according to the first aspect of the invention, wherein the adhesive resin is a polyester resin.

According to a sixth aspect of the invention, the toner for electrostatic charge development according to the fifth aspect of the invention, wherein the polyester resin has a glass transition temperature (Tg) of 50 ° C or more and 80 ° C or less.

According to a seventh aspect of the invention, the toner for electrostatic charge development according to the fifth aspect of the invention, wherein the polyester resin has a molecular weight distribution Mw/Mn of 1.5 or more and 100 or less.

According to a ninth aspect of the invention, the toner for electrostatic charge development according to the first aspect of the invention, wherein the toner particles contain 20% by mass or less of a white pigment.

According to a ninth aspect of the invention, the toner for electrostatic charge development according to the eighth aspect of the present invention, wherein the total amount of CI Pigment Orange 38, CI Pigment Red 185, and white pigment accounts for 85 mass of the total amount of the colorant in the toner particles. %the above.

According to a tenth aspect of the invention, the toner for electrostatic charge development according to the first aspect of the invention, further comprising a release agent, wherein the release temperature of the release agent is 50° C. or higher and 110° C. or lower.

According to a tenth aspect of the invention, the toner for electrostatic charge development according to the tenth aspect of the invention, wherein the content of the release agent is 1% by mass or more and 20% by mass or less.

According to a twelfth aspect of the invention, the toner for electrostatic charge development according to the first aspect of the invention, wherein the toner particles have a volume average particle diameter (D50v) of 2 μm or more and 10 μm or less.

According to a thirteenth aspect of the invention, the toner for electrostatic charge development according to the first aspect of the invention, wherein the toner particles have a shape factor SF1 of 110 or more and 150 or less.

A fourteenth invention of the present invention is an electrostatic charge developer comprising the above first The toner for electrostatic charge development of the invention.

According to a fifteenth aspect of the invention, there is provided an electrostatic charge developer comprising the toner for electrostatic charge development according to the second aspect of the invention.

According to a sixteenth aspect of the invention, there is provided an electrostatic charge developer comprising the toner for electrostatic charge development according to the third aspect of the invention.

According to a seventeenth aspect of the invention, the toner cartridge is used for accommodating the toner for electrostatic charge development of the first invention, and is detachable from the image forming apparatus.

According to an eighteenth aspect of the invention, the toner cartridge is used for accommodating the electrostatic charge developing toner of the second invention, and is detachable from the image forming apparatus.

According to a nineteenth aspect of the invention, the toner cartridge is used for accommodating the toner for electrostatic charge development of the third invention, and is detachable from the image forming apparatus.

In the case of the above-mentioned condition (A), the toner of the electrostatic charge development which is excellent in color reproducibility of PANTONE Warm Red C is provided in the first to fourth inventions of the present invention.

Compared with the case where the toner particles do not satisfy any of the above conditions (B1) and (B2), according to the second invention of the present invention, an electrostatic charge development of PANTONE Warm Red C which is more excellent in color reproducibility is provided. Use toner.

The third invention of the present invention provides a toner for electrostatic charge development which is more excellent in color reproducibility of PANTONE Warm Red C than the case where the toner particles do not satisfy the above condition (C).

In contrast to the case where the toner particles contained in the toner do not satisfy the above condition (A), according to the fourteenth aspect of the present invention, an electrostatically chargeable developer excellent in color reproducibility of PANTONE Warm Red C is provided.

Compared with the case where the toner particles contained in the toner do not satisfy any of the above conditions (B1) and (B2), according to the fifteenth invention of the present invention, a color reproduction of PANTONE Warm Red C is provided. More excellent electrostatic charge developer.

According to the sixteenth invention of the present invention, an electrostatically chargeable developer having more excellent color reproducibility of PANTONE Warm Red C is provided in comparison with the case where the toner particles contained in the toner do not satisfy the above condition (C).

In contrast to the case where the toner particles contained in the toner do not satisfy the above condition (A), according to the seventeenth aspect of the invention, the toner of the PANTONE Warm Red C is excellent in color reproducibility.

Compared with the case where the toner particles contained in the toner do not satisfy any of the above conditions (B1) and (B2), according to the 18th invention of the present invention, a color reproduction of PANTONE Warm Red C is provided. More excellent toner cartridges.

In contrast to the case where the toner particles contained in the toner do not satisfy the above condition (C), the 19th invention of the present invention provides a toner cartridge which is more excellent in color reproducibility of PANTONE Warm Red C.

10R, 10Y, 10M, 10C, 10K‧‧‧ image forming unit

1R, 1Y, 1M, 1C, 1K‧‧‧ photoreceptors (an example of an image holder)

2R, 2Y, 2M, 2C, 2K‧‧‧ charging roller (an example of charging means)

3R, 3Y, 3M, 3C, 3K‧‧‧ exposure devices (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 roller (an example of a primary transfer means)

6R, 6Y, 6M, 6C, 6K‧‧‧Photoreceptor cleaning device (an example of cleaning means)

8R, 8Y, 8M, 8C, 8K‧‧‧ toner magazine

20‧‧‧Intermediate transfer belt (an example of an intermediate transfer body)

21‧‧‧Intermediate transfer body cleaning device

22‧‧‧Drive roller

23‧‧‧Support roller

24‧‧‧ opposite roller

26‧‧‧Secondary transfer roller (an example of secondary transfer means)

28‧‧‧Fixing device (an example of fixing means)

P‧‧‧recording paper (an example of a recording medium)

107‧‧‧Photoreceptor (an example of an image holder)

108‧‧‧Charging roller (an example of charging means)

109‧‧‧Exposure device (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‧‧‧Photoreceptor cleaning device (an example of cleaning means)

115‧‧‧Fixing device (an example of fixing means)

116‧‧‧Installation rail

117‧‧‧ frame

118‧‧‧Exposure opening

200‧‧‧Processing

300‧‧‧recording paper (an example of a recording medium)

Fig. 1 is a schematic block diagram showing an example of an image forming apparatus of the embodiment.

Fig. 2 is a schematic block diagram showing an example of a process cartridge of the embodiment.

Hereinafter, embodiments of the present invention will be described. In addition, the description and examples are illustrative of the invention and are not intended to limit the scope of the invention.

In the present specification, (meth)acryloyl group means propylene fluorenyl group and methacryl fluorenyl group; (meth)acrylic acid means acrylic acid and methacrylic acid; (meth)acrylic hydrazine means propylene 醯 and methacryl oxime.

<Toner for electrostatic charge development>

The toner for electrostatic charge development (also referred to as "toner") of the present embodiment contains toner particles, and may further contain an external additive. That is, in the present embodiment, the toner particles may be used as a toner, and an external additive may be additionally added to the toner particles as a toner.

The toner particles constituting the toner of the present embodiment contain a binder resin and a coloring agent, and the content of the CI pigment orange 38 is 6.3% by mass or more and 8.1% by mass or less, and the content ratio of the CI Pigment Red 185. It is 0.7% by mass or more and less than 1.7% by mass. As a coloring agent contained in the toner particles, a toner excellent in color reproducibility of PANTONE Warm Red C is provided by combining C.I. Pigment Orange 38 and C.I. Pigment Red 185 at the above content ratio.

The toner formed on the recording medium by the toner having a content ratio of CI Pigment Orange 38 in the toner particles and a content of CI Pigment Red 185 not in the above range is obtained by the coloring of the present embodiment. The image formed on the recording medium is small, and the color difference ΔE of the PANTONE Warm Red C is small.

Here, the color difference ΔE is a color difference expressed by the L ^* value, the a ^* value, and the b ^* value in the CIE1976L ^* a ^* b ^* color system, and is defined by the following formula.

In the above formula, L ₁ , a ₁ , and b ₁ are L ^* values, a ^* values, and b ^* values of PANTONE Warm Red C, which are obtained by measuring a commercially available color sample (coated paper) by a reflection spectrodensitometer. value. L ₂ , a ₂ , and b ₂ are values of the L ^* value, the a ^* value, and the b ^* value of the image formed on the coated paper by the toner of the present embodiment, and are obtained by measuring the image by a reflection spectrodensitometer. .

The smaller the color difference ΔE defined in the above formula, the better. The upper limit of the color difference ΔE is preferably 8 or less, more preferably 5 or less, and most preferably 4 or less.

The content ratio of C.I. Pigment Orange 38 and C.I. Pigment Red 185 contained in the toner particles can be confirmed by the following operations (1) to (2).

(1) The toner particles are obtained by removing an external additive from the toner.

The toner was placed in ion-exchanged water containing 0.1% by mass of a surfactant and dispersed. Then, ultrasonic waves are applied to free the external additive of the toner surface from the toner surface, and the dispersion is suction-filtered. The dispersion and filtration were repeated 3 times, and then the toner particles were obtained by drying it. (2) The elements contained in the toner particles are analyzed by an X-ray fluorescence analyzer.

Toner particles having an amount of 0.130 g were molded into a disk shape using an X-ray fluorescence analyzer (XRF-1500, manufactured by Shimadzu Corporation), and the X-ray output was 40 V-70 mA, and the measurement area was 10 mm. The whole element qualitative and quantitative analysis was carried out under the conditions of a measurement time of 15 minutes, and the net strength of Cl derived from CI Pigment Orange 38 and the net intensity of S derived from CI Pigment Red 185 were determined.

Further, CI Pigment Orange 38 and CI Pigment Red 185 were each mixed with a resin, and adjusted to a four-stage concentration (CI Pigment Orange 38 was 5% by mass, 10% by mass, 15% by mass, and 20% by mass; CI Pigment Red 185 was The samples of 1% by mass, 2% by mass, 3% by mass, and 4% by mass were subjected to the same analysis as described above to prepare a standard curve.

Next, the content of CI Pigment Orange 38 and CI Pigment Red 185 contained in the toner particles was calculated from the net strength of Cl derived from CI Pigment Orange 38 and the net strength derived from CI Pigment Red 185, and a standard curve. rate.

[Toner Particles]

The toner particles contain a binder resin and a colorant, and may further contain a release agent or other internal additives.

Hereinafter, the components contained in the toner particles will be described in detail.

-Adhesive resin -

Examples of the binder resin include styrene (for example, styrene, p-chlorostyrene, α-methylstyrene, etc.); (meth)acrylates (for example, methyl (meth)acrylate, (methyl) Ethyl acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, etc.; ethylenically unsaturated Nitriles (such as (meth)acrylonitrile, etc.); vinyl ethers (such as vinyl methyl ether, vinyl isobutyl ether, etc.); vinyl ketones (such as vinyl methyl ketone, vinyl ethyl ketone, a vinyl isopropenyl ketone or the like; and a homopolymer or copolymer of an olefin (for example, ethylene, propylene, butadiene, etc.).

Typical examples of the binder resin include polyester resin, epoxy resin, polyaminomethyl ester resin, polyamide resin, cellulose resin, polyether resin, polystyrene, and styrene-(methyl). An alkyl acrylate copolymer, a styrene-(meth)acrylonitrile copolymer, a styrene-butadiene copolymer, a styrene-maleic anhydride copolymer, or the like.

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 or more and 93% by mass or less, more preferably 50% by mass or more and 90% by mass or less, and most preferably 60% by mass or more and 85% by mass or less.

As the binder resin, a polyester resin is suitable.

From the viewpoint of better color reproducibility of PANTONE Warm Red C, polyester The resin may also be used in combination with an amorphous polyester resin and a crystalline polyester resin.

polyester resin

The polyester resin may, for example, be a polycondensate of a polyvalent carboxylic acid and a polyhydric alcohol. As the polyester resin, a commercially available product or a synthetic product can be used.

As the polyvalent carboxylic acid, for example, an aliphatic dicarboxylic acid (for example, 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 (such as cyclohexane dicarboxylic acid, etc.); aromatic dicarboxylic acids (such as terephthalic acid, isophthalic acid, phthalic acid, Naphthalene dicarboxylic acid or the like, such acid anhydrides, or such lower alkyl esters (for example, having a carbon number of 1 or more and 5 or less). Among these, as the polyvalent carboxylic acid, for example, an aromatic dicarboxylic acid is preferred.

For the polyvalent carboxylic acid, a ternary or higher carboxylic acid having a crosslinked structure or a branched structure may be used together with the dicarboxylic acid. Examples of the ternary or higher carboxylic acid include trimellitic acid, pyromellitic acid, and the like, or lower-order (for example, a carbon number of 1 or more and 5 or less) alkyl ester.

The polyvalent carboxylic acid may be used alone or in combination of two or more.

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; (e.g., cyclohexanediol, cyclohexanedimethanol, hydrogenated bisphenol A, etc.); and aromatic diols (e.g., ethylene oxide adducts of bisphenol A and propylene oxide adducts of bisphenol A, etc.) ). Among these, as the polyhydric alcohol, for example, an aromatic diol and an alicyclic diol are preferable, and an aromatic diol is more preferable.

For the polyol, a trihydric or higher alcohol having a crosslinked structure or a branched structure may be used together with the diol. Examples of the trivalent or higher alcohol include glycerin and trimethylolpropane. And pentaerythritol and the like.

The polyol may be used alone or in combination of two or more.

The glass transition temperature (Tg) of the polyester resin is preferably 50 ° C or more and 80 ° C or less, more preferably 50 ° C or more and 65 ° C or less.

Further, the glass transition temperature was determined from the DSC curve obtained by differential scanning calorimetry (DSC). More specifically, it is obtained by the "extrapolation glass transition start temperature" described in the method for determining the glass transition temperature in JIS K7121-1987 "Method for Measuring Plastic Transfer Temperature".

The weight average molecular weight (Mw) of the polyester resin is preferably 5,000 or more and 1,000,000 or less, more preferably 7,000 or more and 500,000 or less.

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, more preferably 2 or more and 60 or less.

Further, the weight average molecular weight and the number average molecular weight of the resin were measured by a gel permeation chromatography (GPC). The molecular weight of the GPC was measured using HLC-8120 manufactured by Tosoh Corporation as a measuring apparatus, TSK gel Super HM-M15cm manufactured by Tosoh Corporation as a color column, and tetrahydrofuran as a solvent. The weight average molecular weight and the number average molecular weight were calculated using a molecular weight calibration curve prepared from the monodisperse polystyrene standard sample from the measurement results.

-Colorant-

The toner particles contain C.I. Pigment Orange 38 and C.I. Pigment Red 185 within the range of the following condition (A).

The condition (A): C.I. The content of the pigment orange 38 is 6.3% by mass or more and 8.1% by mass or less, and the content of the C.I. Pigment Red 185 is 0.7% by mass or more and less than 1.7% by mass.

The lower limit of the content of the CI pigment orange 38 in the toner particles is 6.3 mass% or more, and more preferably 6.5% by mass or more, and most preferably 6.7% by mass, from the viewpoint of more excellent color reproducibility of PANTONE Warm Red C. the above.

The upper limit of the content ratio of the CI pigment orange 38 in the toner particles is 8.1% by mass or less, and more preferably 7.9 mass% or less, and most preferably 7.7% by mass, from the viewpoint of more excellent color reproducibility of PANTONE Warm Red C. the following.

The lower limit of the content ratio of the CI Pigment Red 185 in the toner particles is 0.7% by mass or more, and more preferably 0.9% by mass or more, and most preferably 1.1% by mass from the viewpoint of more excellent color reproducibility of PANTONE Warm Red C. the above.

The upper limit of the content ratio of C.I. Pigment Red 185 in the toner particles is less than 1.7% by mass, and more preferably 1.5% by mass or less from the viewpoint of more excellent color reproducibility of PANTONE Warm Red C.

In addition, from the viewpoint of more excellent color reproducibility of PANTONE Warm Red C, the content ratio of CI Pigment Orange 38 in the toner particles and the content ratio of CI Pigment Red 185 preferably satisfy the following conditions (B1) and conditions ( At least one of B2) preferably satisfies the following condition (C).

The condition (B1): C.I. The content of the pigment orange 38 is 6.7% by mass or more and 7.7% by mass or less, and the content of the C.I. Pigment Red 185 is 0.9% by mass or more and less than 1.7% by mass.

The condition (B2): C.I. The content of the pigment orange 38 is 6.5% by mass or more and 7.9% by mass or less, and the content of the C.I. Pigment Red 185 is 1.1% by mass or more and 1.5% by mass or less.

The condition (C): C.I. The content of the pigment orange 38 is 6.7% by mass or more and 7.7% by mass or less, and the content of the C.I. Pigment Red 185 is 1.1% by mass or more and 1.5% by mass or less.

The toner particles may also contain other colorants other than C.I. Pigment Orange 38 and C.I. Pigment Red 185. The other coloring agent may be a pigment or a dye, and a pigment is preferred from the viewpoint of light resistance or water resistance.

Examples of the other coloring agent include white pigments such as SiO ₂ (cerium oxide), TiO ₂ (titanium dioxide), and Al ₂ O ₃ (alumina); CI Pigment Red 122, CI Pigment Red 48:1, and CI Pigment Red. 57:1, red pigments and dyes such as bengal rose red; yellow pigments and dyes such as CI pigment yellow 97, CI pigment yellow 12, quinoline yellow, chrome yellow; green pigments and dyes such as malachite oxalate; CI Pigment Blue 15:1, CI Pigment Blue 15:3, aniline blue, copper oil blue, ultramarine blue, phthalocyanine blue, methylene chloride blue and other blue pigments and dyes; carbon black, lamp black, nigro black, etc. Black pigments and dyes; etc.

A white pigment such as cerium oxide, titanium oxide or aluminum oxide may be added to the toner particles in applications other than coloring (for example, use of charge control of toner).

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, and most preferably 10% by mass or less, from the viewpoint of easy color reproduction of PANTONE Warm Red C. It is preferably 5% by mass or less, and particularly preferably 1% by mass or less.

From the viewpoint of easy color reproduction of PANTONE Warm Red C, the content of the coloring agent other than CI Pigment Orange 38, CI Pigment Red 185, and white pigment in the toner particles is preferably 1 mass per colorant. % or less is more preferably 0.5% by mass or less, most preferably 0.1% by mass or less, and most preferably not more than the detection limit, and is preferably substantially not included, and particularly preferably 0% by mass.

From the viewpoint of easy color reproduction of PANTONE Warm Red C, the total amount of C.I. Pigment Orange 38, C.I. Pigment Red 185, and white pigment accounts for the toner. The total amount of the coloring agent in the particles is preferably 85% by mass or more, more preferably 90% by mass or more, most preferably 95% by mass or more, still more preferably 99% by mass or more, and particularly preferably 100% by mass (i.e., It does not contain CI Pigment Orange 38, CI Pigment Red 185, and a coloring agent other than white pigment).

From the viewpoint of easy color reproduction of PANTONE Warm Red C, the total amount of CI Pigment Orange 38 and CI Pigment Red 185 is preferably 30% by mass or more, and more preferably 40% by total of the coloring agent in the toner particles. The mass% or more is preferably 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass, most preferably 80% by mass, and most preferably 90% by mass, and particularly preferably 100% by mass. % (ie, no other colorants other than CI Pigment Orange 38 and CI Pigment Red 185).

-Release agent-

Examples of the release agent include hydrocarbon waxes; natural waxes such as carnauba wax, rice bran 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. ;Wait. The release agent is not limited to this.

The melting temperature of the release agent is preferably 50 ° C or more and 110 ° C or less, more preferably 60 ° C or more and 100 ° C or less.

In addition, the melting temperature of the release agent is a DSC curve obtained by differential scanning calorimetry (DSC), and the melting is described in the method of determining the melting temperature of the method for measuring the transfer temperature of plastics in JIS K7121-1987. The peak temperature is obtained.

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 also contain inorganic oxide particles. Examples of the inorganic oxide include SiO ₂ (cerium oxide), TiO ₂ (titanium dioxide), Al ₂ O ₃ (alumina), CuO, ZnO, SnO ₂ , CeO ₂ , Fe ₂ O ₃ , MgO, and BaO. Metals such as 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 Oxide.

The surface of the inorganic oxide particles may not be subjected to hydrophobic treatment in advance, 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, and most preferably 10% by mass or less from the viewpoint of not affecting the toner hue. Further, it is preferably 5% by mass or less, and particularly preferably 1% by mass or less.

-Other additives -

As other additives, for example, known additives such as a magnetic substance, a charge control agent, and an inorganic powder are mentioned. These additives are contained in the toner particles as internal additives.

- Characteristics of toner particles -

The toner particles may be toner particles of a single layer structure, or may be toner particles of a so-called core-shell structure composed of a core (core particles) and a coating layer (shell layer) covering the core portion. . The toner particles of the core-shell structure may be composed of, for example, a core portion and a coating layer, wherein the core portion includes a binder resin, a colorant, and other additives such as a release agent as needed; The layer is composed of a binder resin.

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.

Using Coulter Multisizer II (manufactured by Beckman Coulter), Various average particle diameters and various particle size distribution indexes of the toner particles were measured using ISOTON-II (manufactured by Beckman Coulter Co., Ltd.) as an electrolytic solution.

In the measurement, 0.5 mg or more and 50 mg or less of the measurement sample is added to 2 ml of an aqueous solution of 5% surfactant (preferably sodium alkylbenzenesulfonate) to prepare a dispersant. This dispersing agent is added to an electrolytic solution of 100 ml or more and 150 ml or less.

The electrolytic solution in which the sample was suspended was subjected to dispersion treatment for 1 minute in an ultrasonic disperser, and the particle size distribution of particles having a particle diameter of 2 μm or more and 60 μm or less was measured by a Coulter Multisizer II using pores having a pore diameter of 100 μm. In addition, the number of sampled particles is 50,000.

For the particle size range (channel) divided based on the measured particle size distribution, the volume and quantity cumulative distribution are plotted from the small diameter side, and the particle size when the cumulative percentage is 16% is defined as the volume particle diameter D16v and the number particle size D16p. The particle diameter when the cumulative percentage is 50% is defined as the volume average particle diameter D50v and the number average particle diameter D50p, and the particle diameter when the cumulative percentage is 84% is defined as the volume particle diameter D84v and the number particle diameter D84p.

Use of such a volume average particle size distribution index (GSDv) according to (D84v / D16v) ^1/2 calculated in accordance with (D84p / D16p) ^1/2 calculated average number of fine distribution index GSDp).

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

Further, 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 mainly numerically analyzed by using an image analysis device to analyze a microscope image or a scanning electron microscope (SEM) image, and is as follows. Calculated by the formula. That is, it can be obtained by introducing an optical microscope image of particles dispersed on the surface of the slide glass into a Luzex image analysis device by a camera, and obtaining a maximum length and a projected area of 100 particles, and calculating by the above formula, and Get the average.

[External Additives]

As an external additive, inorganic particle is mentioned, for example. Examples of the inorganic particles include 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, and 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 may also be subjected to a hydrophobic treatment. The hydrophobization treatment can be carried out, for example, by immersing the inorganic particles in a hydrophobizing agent or the like. The hydrophobizing agent is not particularly limited, and examples thereof include a decane coupling agent, an eucalyptus oil, a titanate coupling agent, and an aluminum coupling agent. These may be used alone or in combination of two or more.

The amount of the hydrophobization treatment agent is, for example, 1 part by mass or more and 10 parts by mass or less based on 100 parts by mass of the inorganic particles.

Examples of the external additive include resin particles (resin particles such as polystyrene, PMMA, and melamine resin) and a cleaning activator (for example, a metal salt of a higher fatty acid typified by zinc stearate or a particle of a fluorine-containing high molecular weight polymer). )Wait.

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

[Method of Manufacturing Toner]

In the toner of the present embodiment, toner particles are produced, and the toner particles are used as a toner, and an external additive may be added to the toner particles to form a toner.

The toner particles can be produced by any of a dry production method (for example, a kneading method) or a wet production method (for example, a coacervation method, a suspension polymerization method, a dissolution suspension method, or the like). The manufacturing method is not particularly limited, and a known production method can be employed. Among them, toner particles are preferably obtained by a coacervation method.

Specifically, for example, when the toner particles are produced by the coacervation method, the toner particles are produced by the following steps: preparing a resin particle dispersion in which resin particles as a binder resin are dispersed (reparation of resin particle dispersion) Step) a step of preparing a colorant dispersion in which colorant particles are dispersed (colorant dispersion preparation step); after mixing the resin particle dispersion and the colorant dispersion (may also be considered to be mixed with other particle dispersions) In the dispersion liquid, a step of aggregating the resin particles and the colorant (if necessary, other particles) to form aggregated particles (aggregated particle formation step); and heating the aggregated particle dispersion in which the aggregated particles are dispersed is heated The step of melting the aggregated particles to form toner particles (melting step).

Hereinafter, the details of each step of the coacervation method will be described.

In the following description, the method of obtaining the toner particles containing the release agent will be described, but the release agent may be used as needed. Of course, other additives than the release agent can also be used.

-Resin particle dispersion preparation step -

First, a resin particle dispersion in which resin particles as a binder resin are dispersed is prepared.

The resin particle dispersion can be prepared, for example, by dispersing the resin particles in a dispersion medium by a surfactant.

The dispersion medium used in the resin particle dispersion liquid may, for example, be an aqueous medium.

Examples of the aqueous medium include water such as distilled water and ion-exchanged water; alcohols; and the like. These may be used alone or in combination of two or more.

Examples of the surfactant include an anionic surfactant such as a sulfate salt, a sulfonate, a phosphate or a soap; a cationic surfactant such as an amine salt or a quaternary ammonium salt; and a polyethylene glycol. , an alkylphenol oxirane adduct system, a nonionic surfactant such as a polyol system; and the like. Among these, an anionic surfactant and a cationic surfactant are especially mentioned. The nonionic surfactant may also be used in combination with an anionic surfactant or a cationic surfactant.

The surfactant may be used singly or in combination of two or more.

As a method of dispersing the resin particles in the dispersion medium, for example, a general dispersion method using a rotary cutting type homogenizer, a ball mill having a medium, a sand mill, a bead mill (Dyno-Mill), or the like is used. . Depending on the kind of the resin particles, for example, the resin particles may be dispersed in the dispersion medium by a phase inversion emulsification method.

Further, the phase inversion emulsification method is such that the resin to be dispersed is dissolved in the resin-soluble hydrophobic organic solvent, and the base is neutralized in the organic continuous phase (O phase), and then water (W phase) is added. Thereby, the phase inversion from W/O to O/W is performed to disperse the resin in an aqueous medium in the form of particles.

The volume average particle diameter of the resin particles dispersed in the resin particle dispersion liquid is, for example, 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 most preferably 0.1 μm or more and 0.6 μm or less.

Regarding the volume average particle diameter of the resin particles, a particle size distribution obtained by measurement by a laser diffraction type particle size distribution measuring apparatus (for example, LA-700, manufactured by Horiba, Ltd.) is used, and the divided particle size range (channel) is small. The volume cumulative distribution was plotted on the radial side, and the particle diameter when the volume was 50% was set as the volume average particle diameter D50v with respect to all the particles. Further, the volume average particle diameter of the particles in the other dispersion liquid was also measured in the same manner.

The content of the resin particles contained in the resin particle dispersion liquid is preferably 5% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 40% by mass or less.

- Colorant dispersion preparation steps -

The colorant dispersion in which the colorant particles are dispersed is prepared in the same manner as the method of preparing the resin particle dispersion. That is, the dispersion medium, the surfactant, the dispersion method, the volume average particle diameter of the particles, and the particle content of the colorant dispersion are the same as those of the resin particle dispersion. Further, instead of the colorant dispersion liquid, a colorant-dispersed resin particle dispersion liquid in which the colorant is dispersed in the resin particles may be used.

Further, the release agent dispersion in which the release agent particles are dispersed is also prepared in the same manner as the method of preparing the resin particle dispersion. That is, the dispersion medium, the surfactant, the dispersion method, the volume average particle diameter of the particles, and the particle content of the release agent dispersion are the same as those of the resin particle dispersion. Further, 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.

- Aggregate particle formation step -

Next, the resin particle dispersion, the colorant dispersion, and the release agent dispersion are mixed.

Next, aggregated particles are formed in the mixed dispersion, and the aggregated particles are heterogeneously agglomerated with the resin particles, the colorant particles, and the release agent particles in the mixed dispersion (hetero- The agglomeration has a diameter close to the diameter of the target toner particles, and contains resin particles, colorant particles, and release agent particles.

Specifically, for example, the pH of the mixed dispersion is adjusted to be acidic (for example, pH 2 or more and 5 or less) while adding a coagulant to the mixed dispersion, and a dispersion stabilizer is added as needed, and then heated to the glass of the resin particles. The temperature in the vicinity of the transition temperature (specifically, for example, -30 ° C or more of the glass transition temperature of the resin particles and -10 ° C or less of the glass transition temperature) causes the particles dispersed in the mixed dispersion to aggregate to form aggregated particles.

In the agglutination particle formation step, for example, the aggregating agent may be added at room temperature (for example, 25 ° C) while stirring the mixed dispersion with a rotary shear type homogenizer, and the pH of the mixed dispersion is adjusted to be acidic (for example, pH 2). Above and 5 or less, heating is performed after adding a dispersion stabilizer as needed.

The coagulant may, for example, be a surfactant having a polarity opposite to that of the surfactant contained in the mixed dispersion, for example, an inorganic metal salt or a divalent or higher metal complex. When the metal complex is used as a coagulant, the amount of the aggregating agent used is reduced, and the charging property is improved.

Additives that form a complex or similar combination with the metal ions of the aggregating agent can also be used with the aggregating agent. As such an additive, a chelating agent can be suitably used.

Examples of the inorganic metal salt include metal salts such as calcium chloride, calcium nitrate, barium chloride, magnesium chloride, zinc chloride, aluminum chloride, and aluminum sulfate; polyaluminum chloride, polyaluminum hydroxide, and calcium polysulfide. Inorganic metal salt polymer; and the like.

As the chelating agent, a water-soluble chelating agent can be used. Examples of the chelating agent include oxidized carboxylic acids such as tartaric acid, citric acid, and gluconic acid; amines such as imidodiacetic acid (IDA), nitrilotriacetic acid (NTA), and ethylenediaminetetraacetic acid (EDTA). Carboxylic acid;

The amount of the chelating agent to be added is, for example, preferably 100 parts by mass of the resin particles. 0.01 parts by mass or more and 5.0 parts by mass or less, more preferably 0.1 part by mass or more and less than 3.0 parts by mass.

- Melting step -

Next, the aggregated particle dispersion in which the aggregated particles are dispersed is heated, for example, to a temperature higher than the glass transition temperature of the resin particles (for example, at a temperature higher than a glass transition temperature of the resin particles by 10° C. to 30° C.) to melt the aggregated particles. Toner particles.

Through the above steps, toner particles are obtained.

Further, the toner particles may be produced by the step of forming the second aggregated particles, and after obtaining the aggregated particle dispersion in which the aggregated particles are dispersed, the aggregated particle dispersion and the resin in which the resin particles are dispersed are further prepared. The step of mixing the particle dispersion so that the resin particles adhere to the surface of the aggregated particles to form the second aggregated particles, and the toner particles forming the core-shell structure are dispersed in the second aggregated particles. The second aggregated particle dispersion is heated to melt the second aggregated particles to form toner particles having a core-shell structure.

After the completion of the melting step, the toner particles formed in the solution are subjected to a known washing step, a solid-liquid separation step, and a drying step to obtain toner particles in a dry state.

From the viewpoint of chargeability, the washing step can sufficiently perform the displacement washing using ion-exchanged water. Further, the solid-liquid separation step is not particularly limited, but from the viewpoint of productivity, suction filtration, pressure filtration, or the like can be performed. Further, the method of the drying step is not particularly limited, but from the viewpoint of productivity, freeze drying, flash spray drying, fluidized bed drying, vibration type fluidized bed drying, or the like can be performed.

Further, the toner in the present embodiment can be, for example, dried. The toner particles are prepared by adding an external additive and mixing them. The above mixing can be carried out, for example, by using a V-type mixer, a Henschel mixer, a Loedige mixer, or the like. Further, depending on the necessity, coarse particles in the toner may be removed by a vibrating sifter, a wind sifter or the like.

Next, a method of producing the toner particles in the dissolution suspension method will be described in detail.

The dissolution suspension method is a method of obtaining toner particles by a method comprising: a material containing a binder resin, a colorant, and other components such as a release agent to be used, and a dissolution or dispersion of the above binder resin. The liquid in the soluble solvent is granulated in an aqueous medium containing an inorganic dispersant, and then the solvent is removed to obtain toner particles.

Examples of the other components used in the dissolution suspension method include various components such as an internal additive, a charge control agent, an inorganic powder (inorganic particles), and organic particles, in addition to the release agent.

In the present embodiment, the binder resin, the colorant, and other components to be used as needed are dissolved or dispersed in a solvent in which the binder resin can be dissolved. Whether the binder resin can be dissolved depends on the constituent components of the binder resin, the molecular chain length, the degree of three-dimensionality, and the like, and therefore cannot be generalized, but hydrocarbons such as toluene, xylene, and hexane are usually used; methyl chloride, chloroform, dichloroethane, Halogenated hydrocarbon such as dichloroethylene; alcohol or ether such as ethanol, butanol, benzyl alcohol ether, benzyl alcohol isopropyl ether, tetrahydrofuran or tetrahydropyran; methyl acetate, ethyl acetate, butyl acetate, isopropyl acetate, etc. Ester; ketone or acetal such as acetone, methyl ethyl ketone, diisobutyl ketone, dimethyl ether, diacetone alcohol, cyclohexanone or methylcyclohexanone.

These solvents are used to dissolve the binder resin without dissolving the colorant and other ingredients. The colorant and other components may be dispersed in the adhesive resin solution. The amount of the solvent to be used is not limited as long as it can be granulated in an aqueous medium. The ratio of the material (the former) containing the binder resin, the colorant and other components to the solvent (the latter) is preferably from 10/90 to 50/ from the viewpoints of the easiness of granulation and the yield of the final toner particles. 50 (previous / latter quality ratio).

A liquid (toner mother liquid) of a binder resin, a colorant, and other components dissolved or dispersed in a solvent is granulated so as to form a predetermined particle diameter in an aqueous medium containing an inorganic dispersant. The aqueous medium is mainly used for water. The mixing of the aqueous medium and the toner mother liquid is preferably aqueous medium/mother liquid = 90/10 to 50/50 (mass ratio). As the inorganic dispersant, it is preferably selected from the group consisting of tricalcium phosphate, hydroxyapatite, calcium carbonate, titanium oxide, and cerium oxide powder. The amount of the inorganic dispersant used depends on the particle diameter of the granulated particles, but it is usually preferably 0.1% by mass or more and 15% by mass or less based on the toner mother liquid. When the amount is 0.1% by mass or more, the particles can be favorably granulated, and when the amount is 15% by mass or less, generation of unnecessary fine particles can be suppressed and high-yield target particles can be obtained.

In order to allow the toner mother liquor to be granulated favorably in an aqueous medium containing an inorganic dispersant, an auxiliary agent may be added to the aqueous medium. As the auxiliary agent, there are known cationic, anionic and nonionic surfactants, and particularly preferred anionic. For example, sodium alkylbenzenesulfonate, sodium α-olefin sulfonate, sodium alkylsulfonate, etc., are preferably 1 × 10 ^-4 mass % or more and 0.1 mass % or less with respect to the toner mother liquid. Used within the scope.

The granulation of the toner mother liquor in an aqueous medium containing an inorganic dispersant is preferably carried out under shearing. The toner mother liquid dispersed in the aqueous medium is preferably granulated to have an average particle diameter of 15 μm or less. It is particularly preferably 3 μm or more and 10 μm or less.

As a device having a shearing mechanism, there are various dispersing machines, of which a homogenizer is preferred. By using a homogenizer, a substance which is incompatible with each other (in the present embodiment, an aqueous medium containing an inorganic dispersant and a toner mother liquid) is passed through a gap between the sleeve and the rotary rotor, whereby a certain The substance in the liquid which is incompatible with the liquid is dispersed in the form of particles. As the homogenizer, there are a TK homogenizer, a line homogenizer, an automatic homogenizer (above, special machine chemical company), a Silverson homogenizer (Silverson Co., Ltd.), and a Polytron homogenizer. (made by KINEMATICA AG).

The stirring condition using the homogenizer is preferably such that the peripheral speed of the blades of the rotor is 2 m/sec or more. If it is more than this speed, particle formation tends to fully proceed. In the present embodiment, the toner mother liquid is granulated in an aqueous medium containing an inorganic dispersant, and then the solvent is removed. The removal of the solvent can be carried out at normal temperature (25 ° C) under normal pressure, but the removal takes a long time, so it is preferably carried out at a temperature lower than the boiling point of the solvent and at a temperature ranging from 80 ° C to less than the boiling point. The pressure may be normal pressure or reduced pressure, but it is preferably 20 mmHg or more and 150 mmHg or less under reduced pressure.

The toner particles which are subjected to the above dissolution and suspension method are preferably washed with hydrochloric acid or the like after removing the solvent. Thereby, the inorganic dispersing agent remaining on the surface of the toner particles can be removed, and the original composition of the toner particles can be obtained and the characteristics thereof can be improved. Then, when dehydrated and dried, powder toner particles can be obtained.

In the toner particles obtained by the dissolution suspension method, in the same manner as in the aggregation method, for the purpose of adjusting chargeability, imparting fluidity, and imparting charge exchangeability, it is possible to add and attach cerium oxide, titanium oxide, or aluminum oxide. A representative inorganic oxide or the like is used as an external additive. Further, in addition to the above inorganic oxide or the like, other components (particles) such as a charge control agent, an organic granule, a lubricant, and an abrasive may be added as an external additive.

<electrostatic charge image developer>

The electrostatic charge developer of the present embodiment contains at least the toner of the embodiment.

The electrostatic charge developer of the present embodiment may be a single component developer containing only the toner of the embodiment, or may be a two component developer obtained by mixing the above toner with a carrier.

The carrier is not particularly limited, and a known carrier can be mentioned. Make The carrier may, for example, be a coated carrier coated with a resin on a surface of a core material formed of a magnetic powder; a magnetic powder dispersion type carrier in which a magnetic powder is dispersed and blended in a matrix resin; and a resin impregnated in the porous magnetic powder a resin-impregnated carrier; a conductive particle-dispersed carrier in which a conductive particle is dispersed and blended in a matrix resin;

The magnetic powder dispersion type carrier, the resin-impregnated type carrier, and the conductive particle-dispersed type carrier may have a carrier particle of the carrier as a core material and a resin-coated carrier on the surface thereof.

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

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; and the like.

Examples of the coating resin and the matrix resin include polyethylene, polypropylene, polystyrene, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl chloride, polyvinyl ether, and polyvinyl. a ketone, a vinyl chloride-vinyl acetate copolymer, a styrene-acrylic acid copolymer, a linear oxirane resin comprising an organic decane bond, or a modified product thereof, a fluororesin, a polyester, a polycarbonate, a phenol resin, Epoxy resin, etc. An additive such as a conductive material may be contained in the coating resin and the matrix resin.

In the case where the surface of the core material is coated with a resin, a method of coating the solution for forming a coating layer in which a resin for coating and various additives (if necessary) are dissolved in a suitable solvent is used. The solvent is not particularly limited and may be selected depending on the type of resin to be used, coating suitability, and the like.

Specific examples of the resin coating method include a dipping method in which a core material is immersed in a coating layer forming solution, a spraying method in which a coating layer forming solution is sprayed onto a surface of a core material, and a core material is floated by flowing air. Spraying the flow of the coating solution for forming a coating layer A chemical bed method; a kneader coating method in which a core material of a carrier is mixed with a coating layer forming solution in a kneading coater, and then the solvent is removed;

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

<Image Forming Apparatus/Image Forming Method>

Hereinafter, the image forming apparatus and the image forming method of the present embodiment will be described.

The image forming apparatus of the present embodiment includes: an image holding body; a charging means for charging a surface of the image holding body; and an electrostatic charge image forming means for forming an electrostatic charge image on the surface of the charged image holding body; and a developing means for accommodating An electrostatically charged developer, and an electrostatic charge image formed on the surface of the image holder is developed as a toner image by the electrostatic charge developer; and a transfer means is used to convert the toner image formed on the surface of the image holder Printing onto the surface of the recording medium; and fixing means for fixing the toner image transferred onto the surface of the recording medium. Further, as the electrostatic charge developer, the electrostatic charge developer of the present embodiment can be applied.

In the image forming apparatus of the present embodiment, an image forming method (the image forming method of the present embodiment) including the charging step of charging the surface of the image holding body, and the electrostatic charge image forming step of the charged image are performed. An electrostatic charge image is formed on the surface of the holder; in the developing step, the electrostatic charge image formed on the surface of the image holder is developed as a toner image by the electrostatic charge developer of the embodiment; and the transfer step is formed on the image The toner image on the surface of the holder is transferred onto the surface of the recording medium; and the fixing step fixes the toner image transferred onto the surface of the recording medium.

The image forming apparatus of the present embodiment can be applied to a known image forming apparatus which is a direct transfer type apparatus which adjusts the surface formed on the image holding body. The toner image is directly transferred onto the recording medium; the intermediate transfer device vertically transfers the toner image formed on the surface of the image holding body onto the surface of the intermediate transfer body, and transfers to the intermediate transfer The toner image on the surface of the printing body is secondarily transferred onto the surface of the recording medium; the device having the cleaning means is used for cleaning the surface of the image holding body before charging after the toner image is transferred; The device, after the toner image is transferred, irradiates the surface of the image holder with a static eliminating light for charging before charging;

In the case of the apparatus of the intermediate transfer method, the transfer means is applied, for example, to an intermediate transfer body for transferring the toner image onto the surface; and the primary transfer means is formed on the image holder. The toner image on the surface is primarily transferred onto the surface of the intermediate transfer body; and the secondary transfer means secondarily transfers the toner image transferred onto the surface of the intermediate transfer body onto the surface of the recording medium .

In the image forming apparatus of the present embodiment, for example, the portion including the developing means may be a structure (process) that can be detached from the image forming apparatus. As the treatment crucible, for example, a treatment crucible for accommodating the electrostatic charge developer of the present embodiment and having a developing means can be suitably used.

Hereinafter, an example of the image forming apparatus of the embodiment will be described, but the invention is not limited thereto. In addition, the main part shown in the figure is demonstrated, and the description of the other part is abbreviate|omitted.

1 is a schematic configuration view showing an image forming apparatus of the present embodiment, and is a view showing an image forming apparatus of a five-series serial type and an intermediate transfer method.

The image forming apparatus shown in FIG. 1 has electrophotographic first to fifth image forming units 10R, 10Y, 10M, 10C, and 10K (image forming means), and outputs red according to the separated color image data ( R), yellow (Y), magenta (M), cyan (C), and black (K) images. These image forming units (hereinafter sometimes simply referred to as "units") 10R, 10Y, 10M, 10C, and 10K are juxtaposed in the horizontal direction at a predetermined distance from each other. The units 10R, 10Y, 10M, 10C, and 10K can also be process detachable from the image forming apparatus.

Below the respective units 10R, 10Y, 10M, 10C, and 10K, an intermediate transfer belt (an example of an intermediate transfer body) 20 is extended through each unit. The intermediate transfer belt 20 is wound around a driving roller 22, a supporting roller 23, and a counter roller 24 that are in contact with the inner surface of the intermediate transfer belt 20, and is operated in a direction from the first unit 10R toward the fifth unit 10K. . On the image holding surface side of the intermediate transfer belt 20, an intermediate transfer member cleaning device 21 is provided opposite to the driving roller 22.

The toners of red, yellow, magenta, cyan, and black contained in the toner cartridges 8R, 8Y, 8M, 8C, and 8K are respectively supplied to the developing devices of the respective units 10R, 10Y, 10M, 10C, and 10K (developing An example of the means) 4R, 4Y, 4M, 4C and 4K.

Since the first to fifth units 10R, 10Y, 10M, 10C, and 10K have the same configuration, operation, and action, the first embodiment for forming a red electric image is disposed on the upstream side of the intermediate transfer belt running direction. The unit 1 10R is represented by a representative.

The first unit 10R has a photoreceptor 1R that functions as an image holder. A charging roller (an example of a charging means) 2R is disposed in the vicinity of the photoreceptor 1R, and the surface of the photoreceptor 1R is charged to a predetermined potential. The exposure device (an example of an electrostatic charge image forming means) 3R is based on the color separation. Image signal, the surface of the charged surface is exposed by a laser beam to form an electrostatic charge image; a developing device (an example of a developing means) 4R for supplying toner to the electrostatic charge image to develop an electrostatic charge image a primary transfer roller (an example of a primary transfer means) 5R for transferring the developed toner image onto the intermediate transfer belt 20, and a photoreceptor cleaning device (an example of a cleaning means) 6R for removing The toner remaining on the surface of the photoreceptor 1R after the primary transfer.

The primary transfer roller 5R is disposed inside the intermediate transfer belt 20 and is located at a position opposed to the photoconductor 1R. A bias power source (not shown) for applying a primary transfer bias is respectively connected to the primary transfer rollers 5R, 5Y, 5M, 5C, and 5K of the respective units. Each of the bias power sources changes the value of the transfer bias applied to each of the primary transfer rollers 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, the surface of the photoreceptor 1R is charged to a potential of -600 V to -800 V by the charging roller 2R before starting the operation.

The photoreceptor 1R is formed by laminating a photosensitive layer on a substrate having conductivity (for example, a volume resistivity at 20 ° C of 1 × 10 ^-6 Ωcm or less). The photosensitive layer is usually of high electrical resistance (generally a resin resistance), but has a property that the specific resistance of a portion irradiated by the laser beam changes when the laser beam is irradiated. Therefore, the laser beam is irradiated onto the surface of the charged photoreceptor 1R from the exposure device 3R based on the red image data transmitted from the control unit (not shown). Thereby, an electrostatic charge image of the red image pattern is formed on the surface of the photoreceptor 1R.

The electrostatic charge image is an image formed on the surface of the photoreceptor 1R by charging, and the specific electric resistance of the irradiated portion of the photosensitive layer is lowered by the laser beam from the exposure device 3R, and the charged electric charge on the surface of the photoreceptor 1R flows. On the other hand, the charge of the portion not irradiated by the laser beam remains, thereby forming a so-called negative latent image.

The electrostatic charge image formed on the photoreceptor 1R is rotated to a predetermined development position in accordance with the operation of the photoreceptor 1R. Further, at the developing position, the electrostatic charge image on the photoreceptor 1R is developed as a toner image by the developing device 4R to be visualized.

The developing device 4R contains, for example, an electrostatic charge developer containing at least a red toner and a carrier. The red toner is stirred inside the developing device 4R to be frictionally charged, and has the same polarity (negative polarity) as the charge carried on the photoreceptor 1R. The charge is such that the red toner is held on the developer roller (an example of the developer holding means). Further, by passing the surface of the photoreceptor 1R through the developing device 4R, the red toner is electrostatically attached to the latent image portion after the static elimination on the surface of the photoreceptor 1R, and the latent image is developed by the red toner. The photoreceptor 1R on which the red toner image is formed continues to operate at a predetermined speed, and the toner image developed on the photoreceptor 1R is transported to a predetermined primary transfer position.

When the red toner image on the photoreceptor 1R is transported to the primary transfer position, the primary transfer bias is applied to the primary transfer roller 5R, and the electrostatic force from the photoreceptor 1R toward the primary transfer roller 5R acts on the adjustment. The toner image is transferred to the intermediate transfer belt 20 by the toner image on the photoreceptor 1R. The transfer bias applied at this time is a (+) polarity opposite to the toner polarity (-), and is controlled to be, 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 recovered by the photoreceptor cleaning device 6R.

The primary transfer bias applied to the primary transfer rollers 5Y, 5M, 5C, and 5K after the second unit 10Y is also controlled based on the first unit.

In this manner, the intermediate transfer belt 20 to which the red toner image is transferred by the first unit 10R is sequentially transported through the second to fifth units 10Y, 10M, 10C, and 10K, and the toner images of the respective colors are superimposed and carried out. Multiple transfer.

By the first to fifth units, the five-color toner image is subjected to the multi-transfer intermediate transfer belt 20 to a secondary transfer portion having a configuration including: an intermediate transfer belt 20; The counter roller 24 that is in contact with the inner surface of the intermediate transfer belt and a secondary transfer roller (an example of a secondary transfer means) 26 that is disposed on the image holding surface side of the intermediate transfer belt 20 are provided. On the other hand, the recording paper (an example of the recording medium) P is transmitted through the supply mechanism for a predetermined time. The gap is supplied to the gap where the secondary transfer roller 26 is in contact with the intermediate transfer belt 20, and a secondary transfer bias is applied to the opposing roller 24. The transfer bias applied at this time 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, thereby causing the intermediate transfer. The toner image on the printing tape 20 is transferred onto the recording paper P. Further, the secondary transfer bias at this time is determined by the resistance detected by the resistance detecting means (not shown) for detecting the resistance of the secondary transfer portion, and the voltage is controlled.

After that, the recording paper P is fed to a crimping portion (nip portion) between a pair of fixing rollers in the fixing device (an example of the fixing means) 28, and the toner image is fixed onto the recording paper P to form Fix the image.

The recording paper P to which the toner image is transferred may, for example, be plain paper used in an electrophotographic copying machine or a printer. As the recording medium, in addition to the recording paper P, an OHP sheet or the like can be cited.

In order to further improve the smoothness of the image surface after fixing, the surface of the recording paper P is preferably smooth. For example, a coated paper obtained by coating a surface of plain paper with a resin or the like, an art paper for printing, or the like is suitably used.

The recording paper P after the fixing of the color image is completed is conveyed toward the discharge unit, and a series of color image forming operations are ended.

<Processing 匣/Toner 匣>

The processing of this embodiment will be described.

The processing cartridge of the present embodiment has a developing means for accommodating the electrostatic charge developer of the embodiment, and electrostatically charged image formed on the surface of the image holding body as a toner image by electrostatic charge developer For development, the process can be removed from the image forming apparatus.

Further, the process of the present embodiment is not limited to the above configuration, and may be selected from, for example, a developing device and other needs, such as a video holding body, a charging means, an electrostatic charge image forming means, a transfer means, and the like. At least one of the means.

Hereinafter, an example of the process 本 of the present embodiment will be described, but the present invention is not limited thereto. In addition, the main part shown in the figure is demonstrated, and the description of the other part is abbreviate|omitted.

Fig. 2 is a view showing a schematic configuration of a process cartridge of the embodiment;

In the process cartridge 200 shown in FIG. 2, for example, the photoreceptor 107 (an example of the image holder) and the charging roller provided around the photoreceptor 107 are provided by the housing 117 provided with the mounting rail 116 and the exposure opening 118. 108 (an example of a charging means), a developing device 111 (an example of a developing means), and a photoreceptor cleaning device 113 (an example of a cleaning means) are combined and held integrally, and are formed in a meander shape.

In FIG. 2, reference numeral 109 denotes an exposure apparatus (an example of an electrostatic charge image forming means), 112 denotes a transfer device (an example of a transfer means), 115 denotes a fixing device (an example of a fixing means), and 300 denotes a recording paper (recording). An example of the media).

Next, the toner cartridge of the present embodiment will be described.

The toner cartridge of the present embodiment is for accommodating the toner of the embodiment and can be detached from the image forming apparatus. The toner cartridge accommodates the toner for replenishment supplied to the developing means mounted in the image forming apparatus.

The image forming apparatus shown in FIG. 1 is an image forming apparatus having a detachable configuration of toner cartridges 8R, 8Y, 8M, 8C, and 8K, and the developing devices 4R, 4Y, 4M, 4C, and 4K are embossed by a not shown. The agent supply tube is connected to the toner cartridge corresponding to each color. Also, when the toner contained in the toner cartridge becomes small, the toner cartridge can be replaced.

[Examples]

Hereinafter, the present invention will be more specifically described by the examples, but the present invention is not limited to the following examples as long as it does not exceed the scope of the invention.

Hereinafter, in the case where it is not particularly limited, the "part" is based on the mass.

Further, C.I. Pigment Orange 38 is referred to as "PO38", C.I. Pigment Red 185 is referred to as "PR185", and C.I. Pigment Red 122 is referred to as "PR122".

<Method for Measuring Physical Properties> [weight average molecular weight of resin]

The weight average molecular weight of the resin was calculated from the results of molecular weight measurement by a gel permeation chromatography (GPC) using the following measuring apparatus, and the molecular weight calibration curve of the monodisperse polystyrene standard sample.

Measuring device: HLC-8120 (manufactured by ToSoh Corporation)

Color column: TSK gel Super HM-M (manufactured by ToSoh Corporation)

Eluent: tetrahydrofuran

[Acid Value of Resin]

The acid value of the resin was measured by a neutralization titration method in accordance with JIS K0070-1992.

[Resin glass transition temperature]

The glass transition temperature of the resin is a DSC curve obtained by differential scanning calorimetry (DSC), and is obtained according to JIS K7121-1987 "Method for Measuring Transfer Temperature of Plastics".

[Volume Average Particle Diameter of Resin Particles and Toner Particles]

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

- When the particle size is 2 μm or more -

In the sample for measurement, 0.5 mg or more and 50 mg or less of particles are added to 2 mL of a 5 mass% aqueous solution of sodium dodecylbenzenesulfonate (surfactant), and the resultant is added to an electrolyte of 100 ml or more and 150 ml or less (Beckman). Coulter's ISOTON-II) was prepared by dispersion treatment in an ultrasonic disperser for 1 minute.

Measuring device: Coulter Multisizer II type (manufactured by Beckman Coulter Co., Ltd.) having a pore diameter of 100 μm.

The sample for measurement and the measuring device were used to measure 50,000 particle diameters of particles of 2 μm or more and 60 μm or less, and the volume average particle size distribution was determined from the particle size distribution.

For the particle size range (channel) divided based on the particle size distribution, the volume cumulative distribution is plotted from the small diameter side, and the particle diameter when the cumulative percentage is 50% is set as the volume average particle diameter.

- When the particle size is less than 2 μm -

Sample for measurement: Ion-exchanged water was added to the particle dispersion, and the solid content was adjusted to be 10% by mass.

Measuring device: Laser diffraction type particle size distribution measuring device (LS13320, manufactured by Beckman Coulter Co., Ltd.).

The measurement sample is placed in the sample tank until the appropriate concentration, and the measurement is performed after reaching a sufficient value to be measured by the scattering intensity. For dividing the particle size range (channel) based on the obtained particle size distribution, the volume cumulative distribution was drawn from the small diameter side, and the particle diameter when the cumulative percentage was 50% was set as the volume average particle diameter.

<Preparation of Resin Particle Dispersion> [Preparation of Resin Particle Dispersion (1)]

For a flask having a stirring capacity of a stirrer, a nitrogen gas introduction tube, a temperature sensor, and a rectification column, the above-mentioned material was charged, and the temperature was raised to 220 ° C in 1 hour, and 1 part was charged with respect to 100 parts of the above materials. Titanium tetraethoxide. While distilling off the generated water, the temperature was raised to 230 ° C over 0.5 hours, and at this temperature, the dehydration condensation reaction was continued 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.

To a vessel equipped with a temperature adjustment means and a nitrogen gas replacement means, 40 parts of ethyl acetate and 25 parts of 2-butanol were added to form a mixed solvent, and then 100 parts of the polyester resin (1) was slowly added to dissolve it, and the mixture was added thereto. A 10% by mass aqueous ammonia solution (the acid value relative to the resin was 3 times equivalent in terms of molar ratio) was stirred for 30 minutes.

Then, the inside of the vessel was replaced with dry nitrogen, and the temperature was kept at 40 ° C, and while stirring the mixture, 400 parts of ion-exchanged water was added dropwise at a rate of 2 parts/min to carry out emulsification. After the completion of the dropwise addition, the emulsion was returned to room temperature (20 ° C to 25 ° C), and while bubbling with dry nitrogen for 48 hours while stirring, thereby reducing ethyl acetate and 2-butanol to 1,000 ppm or less. A resin particle dispersion in which resin particles having a volume average particle diameter of 200 nm were dispersed was obtained. Ion-exchanged water was added to the resin particle dispersion, and the solid content was adjusted to 20% by mass to obtain a resin particle dispersion (1).

[Preparation of Resin Particle Dispersion (2)]

To the flask, a solution obtained by dissolving 4 parts of an anionic surfactant (Dow Fax manufactured by Dow Chemical Co., Ltd.) in 550 parts of ion-exchanged water was added, and a mixed liquid in which the above-mentioned raw materials were mixed was added thereto and emulsified. While slowly stirring the emulsion for 10 minutes, 50 parts of ion-exchanged water in which 6 parts of ammonium persulfate was dissolved was added. Then, after sufficiently replacing the nitrogen in the system, the flask was stirred in an oil bath while heating to the inside of the system to 75 ° C, and the emulsion polymerization was continued for 4 hours in this state. Thus, 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 diameter of 250 nm were dispersed was obtained. Ion-exchanged water was added to the resin particle dispersion, and the solid content was adjusted to 20% by mass to obtain a resin particle dispersion (2).

<Preparation of colorant dispersion> [Preparation of Colorant Dispersion (1)]

The above materials were mixed and dispersed by a homogenizer (Ultra Turrax T50 manufactured by IKA Corporation) for 10 minutes. Ion-exchanged water was added to make the solid content in the dispersion liquid 20% by mass, and a colorant dispersion (1) in which toner particles having a volume average particle diameter of 190 nm were dispersed was obtained.

[Preparation of Colorant Dispersion (2)]

The above materials were mixed and dispersed by a homogenizer (Ultra Turrax T50 manufactured by IKA Corporation) for 10 minutes. Ion-exchanged water was added to make the solid content in the dispersion liquid 20% by mass, and a colorant dispersion (2) in which the toner particles having a volume average particle diameter of 190 nm were dispersed was obtained.

[Preparation of Colorant Dispersion (3)]

The above materials were mixed and dispersed by a homogenizer (Ultra Turrax T50 manufactured by IKA Corporation) for 10 minutes. Ion-exchanged water was added to make the solid content in the dispersion liquid 20% by mass, and a color former dispersion (3) in which toner particles having a volume average particle diameter of 190 nm were dispersed was obtained.

<Preparation of release agent dispersion> [Preparation of release agent dispersion (1)]

The above materials were mixed and heated to 100 ° C, and dispersed by a homogenizer (Ultra Turrax T50 manufactured by IKA Corporation), and then subjected to a Menton-Gaulin high-pressure homogenizer (manufactured by Gaulin Co., Ltd.). After the dispersion treatment, a release agent dispersion (1) in which a release agent particle having a volume average particle diameter of 200 nm was dispersed (solid content: 20% by mass) was obtained.

<Example 1> [Preparation of Toner Particles]

The above material was placed in a circular stainless steel flask, and 0.1 N nitric acid was added thereto to adjust the pH to 3.5, and then 30 parts of an aqueous solution of nitric acid having a polyaluminum chloride concentration of 10% by mass was added. Then, it was dispersed by a homogenizer (Ultra Turrax T50 manufactured by IKA Co., Ltd.) at 30 ° C, and then heated to 45 ° C in an oil bath for heating and held for 30 minutes. Then, 100 parts of the resin particle dispersion liquid (1) was gradually added and kept for 1 hour, and the pH was adjusted to 8.5 by adding a 0.1 N sodium hydroxide aqueous solution, and the mixture was heated to 85 ° C while stirring for 5 hours. Then, it was cooled to 20 ° C at a rate of 20 ° C /min, filtered, thoroughly washed with ion-exchanged water, and dried to obtain toner particles (1) having a volume average particle diameter of 7.5 μm.

[Preparation of externally added toner]

To 100 parts of the toner particles (1) and dimethyl cerium oil-treated cerium oxide particles (RY200, manufactured by AEROSIL Co., Ltd., Japan) were mixed with a Henschel mixer to obtain a toner (1).

In the above method, the external additive is removed from the toner (1), and the color is measured. The content of PO38 and PR185 contained in the agent particles was such that the content of PO38 was 6.8% by mass and the content of PR185 was 1.2% by mass.

[Preparation of Developer]

In addition to the ferrite particles, the above components were dispersed in a sand mill to prepare a dispersion, and the dispersion was placed in a vacuum degassing kneader together with the ferrite particles, and dried under reduced pressure while stirring. Obtain a carrier.

To the 100 parts of the above carrier, 5 parts of the toner (1) was mixed to obtain a developer (1).

[Evaluation of color reproducibility]

The following operations, image formation, and measurement were performed in an environment of a temperature of 25 ° C / a humidity of 60%.

A DocuCentre Color 400 CP manufactured by Fuji Xerox Co., Ltd. was prepared as an image forming apparatus for forming an image for evaluation, and the developer (1) was placed in a developing device, and the toner (1) was placed in a toner cartridge.

Then, on a coated paper (OS coated paper W manufactured by Fuji Xerox Co., Ltd.), an image having a monochromatic density of 100% (5 cm × 5 cm in size and a toner amount of 4.5 g/m ² ) was formed.

The L ^* value, the a ^* value, and the b ^* value in the CIE1976L ^* a ^* b ^* color system of the formed image were measured arbitrarily by X-Rite 939 (pore diameter 4 mm) manufactured by X-Rite Co., Ltd., and L was calculated. ^* The average of the value, a ^* value, and b ^* value.

The PANTONE Warm Red C (coated paper) of a commercially available color sample (PANTONE FORMULA GUIDE Solid Coated) manufactured by PANTONE Co., Ltd. was also measured for the L ^* value, the a ^* value, and the b ^* value in the same manner as above, and the respective average values were calculated. L ₁ = 59.0, a ₁ = 69.0, and b ₁ = 50.9.

Then, based on the following formula, the color difference ΔE between the formed image and PANTONE Warm Red C 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 Warm Red C, and L ₂ , a ₂ , and b ₂ are L ^* values, a ^* values, and b ^* of the images of the examples ^. value.

<Examples 2 to 45> [Preparation of Toner Particles]

In the same manner as in Example 1, the amount of each of the resin particle dispersion liquid and the colorant dispersion liquid was adjusted, and the content ratio of each of PO38 and PR185 was as described in Table 1, thereby obtaining toner particles (2) to (45). ).

[Preparation of externally added toner]

In the same manner as the preparation of the toner (1), the toner particles (2) to (45) are used instead of the toner particles (1) to obtain toners (2) to (45).

[Preparation of Developer]

In the same manner as the preparation of the developer (1), the toners (2) to (45) were used instead of the toner (1) to obtain the developers (2) to (45).

[Evaluation of color reproducibility]

The toners (2) to (45) and the developers (2) to (45) were used in place of the toner (1) and the developer (1), and the same evaluation as the color reproducibility evaluation in Example 1 was carried out. The results are shown in Table 2.

In Examples 1 to 45, ΔE was 8 or less.

In Examples 1 to 24 (at least one of the above conditions (B1) and (B2) is satisfied), ΔE It is 5 or less.

In Examples 1 to 10 (which satisfy the above condition (C)), ΔE was 4 or less.

<Example 101> [Preparation of Toner Particles]

The above materials were placed in a circular stainless steel flask and mixed and dispersed by a homogenizer (Ultra Turrax T50 manufactured by IKA Corporation). Then, 0.5 part of polyaluminum chloride was added, and the dispersion operation was continued using a homogenizer. Then, the mixture was heated to 50 ° C while stirring in a heating oil bath, and kept at 50 ° C for 60 minutes. Then, the pH in the system was adjusted to 5.5 with a 0.5 N aqueous sodium hydroxide solution, and then the flask was sealed, and the mixture was heated to 95 ° C while maintaining stirring for 5 hours while maintaining the stirring using a magnetic seal. After completion of the reaction, the mixture was cooled, filtered, washed thoroughly with ion-exchanged water, and then subjected to solid-liquid separation by suction filtration. The resultant was further redispersed in 3 L of ion-exchanged water at 40 ° C, and stirred at 300 rpm for 15 minutes for washing. This was repeated 5 times. When the pH of the filtrate was 6.6 and the conductivity was 12 μS/cm, solid-liquid separation was carried out by suction filtration using No 5A filter paper. Then vacuum drying was continued for 12 hours. Thus, toner particles (101) having a volume average particle diameter of 7.5 μm were obtained.

[Preparation of externally added toner]

The toner (1) is obtained in the same manner as the preparation of the toner (1), but the toner particles (101) are used instead of the toner particles (1).

[Preparation of Developer]

The preparation is carried out in the same manner as the preparation of the developer (1), except that the toner (101) is used instead of the toner (1), and the developer (101) is obtained.

[Evaluation of color reproducibility]

The toner (101) and the developer (101) were used in place of the toner (1) and the developer (1), and the same evaluation as the color reproducibility evaluation in Example 1 was carried out. The results are shown in Table 3.

<Example 102> [Preparation of Toner Particles]

The above materials were kneaded by an extruder, pulverized by a surface pulverizer, and then fine particles and coarse particles were classified by an air classifier to obtain toner particles having a volume average particle diameter of 7.5 μm (102). .

[Preparation of externally added toner]

The toner (1) is obtained in the same manner as the preparation of the toner (1), but the toner particles (102) are used instead of the toner particles (1).

[Preparation of Developer]

The preparation is carried out in the same manner as the preparation of the developer (1), except that the toner (102) is used instead of the toner (1), and the developer (102) is obtained.

[Evaluation of color reproducibility]

The toner (102) and the developer (102) were used in place of the toner (1) and the developer (1), and the same evaluation as the color reproducibility evaluation in Example 1 was carried out. The results are shown in Table 3.

<Example 103> [Preparation of Toner Particles] -Pigment dispersion (A)-

The above material was dispersed in a sand mill as a pigment dispersion liquid (A).

-Pigment dispersion (B)-

The above material was dispersed in a sand mill as a pigment dispersion liquid (B).

- Release agent dispersion (A) -

The above materials were dispersed by a DCP mill while being cooled to 10 ° C to obtain a separation. Formulation dispersion (A).

-C liquid -

The above materials were mixed and stirred to serve as a liquid C.

-D liquid -

The above materials were mixed and stirred to serve as a D solution.

500 parts of the C liquid and 500 parts of the D liquid were mixed and stirred to obtain a suspension, and the suspension was stirred by a propeller type agitator for 48 hours to remove the solvent. Then, 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 externally added toner]

The toner (1) is obtained in the same manner as the preparation of the toner (1), but the toner particles (103) are used instead of the toner particles (1).

[Preparation of Developer]

The preparation is carried out in the same manner as the preparation of the developer (1), except that the toner (103) is used instead of the toner (1), and the developer (103) is obtained.

[Evaluation of color reproducibility]

The toner (103) and the developer (103) were used in place of the toner (1) and the developer (1), and the same evaluation as the color reproducibility evaluation in Example 1 was carried out. The results are shown in Table 3.

<Example 104> [Preparation of Toner Particles]

In the same manner as in the first embodiment, the colorant dispersion liquid (3) was used, and the respective amounts of the resin particle dispersion liquid and the colorant dispersion liquid were adjusted, and the content ratio of each pigment was as described in Table 3, and a toner was obtained. Particle (104).

[Preparation of externally added toner]

The toner (1) is obtained in the same manner as the preparation of the toner (1), but the toner particles (104) are used instead of the toner particles (1).

[Preparation of Developer]

The preparation is carried out in the same manner as the preparation of the developer (1), except that the toner (104) is used instead of the toner (1), and the developer (104) is obtained.

[Evaluation of color reproducibility]

Using the toner (104) and the developer (104) in place of the toner (1) and the developer (1), The same evaluation was evaluated for the color reproducibility in Example 1. The results are shown in Table 3.

<Example 105> [Preparation of Toner Particles]

The above materials were kneaded by an extruder, pulverized by a surface pulverizer, and fine particles and coarse particles were classified by an air classifier to obtain toner particles (105) having a volume average particle diameter of 7.5 μm.

[Preparation of externally added toner]

The toner (1) is used in the same manner as the preparation of the toner (1), but the toner particles (105) are used instead of the toner particles (1).

[Preparation of Developer]

The preparation is carried out in the same manner as the preparation of the developer (1), except that the toner (105) is used instead of the toner (1), and the developer (105) is obtained.

[Evaluation of color reproducibility]

The toner (105) and the developer (105) were used in place of the toner (1) and the developer (1), and the same evaluation as the color reproducibility evaluation in Example 1 was carried out. The results are shown in Table 3.

<Example 106> [Preparation of Toner Particles]

The above materials were kneaded by an extruder, pulverized by a surface pulverizer, and then fine particles and coarse particles were classified by an air classifier to obtain toner particles (106) having a volume average particle diameter of 7.5 μm.

[Preparation of externally added toner]

The toner (1) is used in the same manner as the preparation of the toner (1), but the toner particles (106) are used instead of the toner particles (1).

[Preparation of Developer]

The preparation is carried out in the same manner as the preparation of the developer (1), but the toner (106) is used instead of the toner (1) to obtain a developer (106).

[Evaluation of color reproducibility]

Using the toner (106) and the developer (106) in place of the toner (1) and the developer (1), The same evaluation was evaluated for the color reproducibility in Example 1. The results are shown in Table 3.

<Comparative Examples 1 to 7> [Preparation of Toner Particles]

In the same manner as in the first embodiment, the amount of each of the resin particle dispersion liquid and the colorant dispersion liquid was adjusted so that the content ratio of each pigment was as described in Table 3, and toner particles (C1) to (C7) were obtained.

[Preparation of externally added toner]

In the same manner as the preparation of the toner (1), the toner particles (C1) to (C7) are obtained by using the toner particles (C1) to (C7) instead of the toner particles (1).

[Preparation of Developer]

The preparation is carried out in the same manner as the preparation of the developer (1), but the toners (C1) to (C7) are used instead of the toner (1) to obtain the developers (C1) to (C7).

[Evaluation of color reproducibility]

The toners (C1) to (C7) and the developers (C1) to (C7) were used in place of the toner (1) and the developer (1), and the same evaluation as the color reproducibility evaluation in Example 1 was carried out. The results are shown in Table 3.

Claims (19)

A toner for electrostatic charge development, which contains toner particles, which contains a binder resin and a coloring agent, and satisfies the following condition (A): Condition (A): Content ratio of CI color orange 38 6.3 mass% or more and 8.1 mass% or less, and the content of CI color red 185 is 0.7 mass% or more and less than 1.7% by mass. The toner for electrostatic charge development according to the first aspect of the invention, wherein the toner particles satisfy at least one of the following conditions (B1) and (B2): Condition (B1): CI color orange 38 The content of the CI color red 185 is 0.9% by mass or more and less than 1.7% by mass, and the content of the CI color orange 38 is 6.5% by mass. The content is 7.9% by mass or less, and the content of CI color red 185 is 1.1% by mass or more and 1.5% by mass or less. The toner for electrostatic charge development according to the first aspect of the invention, wherein the toner particles satisfy the following condition (C): condition (C): the content of CI color orange 38 is 6.7 mass% or more and 7.7. The mass% or less and the content of the CI color red 185 are 1.1% by mass or more and 1.5% by mass or less. The toner for electrostatic charge development according to the first aspect of the invention, wherein the content of the binder resin in the toner particles is 40% by mass or more and 93% by mass or less. The toner for electrostatic charge development according to claim 1, wherein the binder resin is a polyester resin. The toner for electrostatic charge development according to claim 5, wherein the polyester resin has a glass transition temperature (Tg) of 50 ° C or more and 80 ° C or less. The toner for electrostatic charge development according to claim 5, wherein the polyester resin has a molecular weight distribution Mw/Mn of 1.5 or more and 100 or less. The toner for electrostatic charge development according to the first aspect of the invention, wherein the toner particles contain 20% by mass or less of a white pigment. The toner for electrostatic charge development according to the eighth aspect of the invention, wherein the total amount of CI Pigment Orange 38, CI Pigment Red 185, and white pigment accounts for 85% by mass or more of the total amount of the colorant in the toner particles. . The toner for electrostatic charge development according to the first aspect of the invention, further comprising a release agent, wherein the release temperature of the release agent is 50° C. or higher and 110° C. or lower. The toner for electrostatic charge development according to claim 10, wherein the content of the release agent is 1% by mass or more and 20% by mass or less. The toner for electrostatic charge development according to the first aspect of the invention, wherein the toner particles have a volume average particle diameter (D50v) of 2 μm or more and 10 μm or less. The toner for electrostatic charge development according to the first aspect of the invention, wherein the shape factor SF1 of the toner particles is 110 or more and 150 or less. An electrostatically chargeable developer comprising the toner for electrostatic charge development of claim 1 of the patent application. An electrostatic charge developer comprising the toner for electrostatic charge development of claim 2 of the patent application. An electrostatically chargeable developer comprising the toner for electrostatic charge development of claim 3 of the patent application. A toner cartridge for containing an electrostatic charge developing toner according to claim 1 of the patent application, and which can be detached from an image forming apparatus. A toner cartridge for containing an electrostatic charge developing toner of the second application of the patent application, and detachable from the image forming apparatus. A toner cartridge for containing an electrostatic charge developing toner according to item 3 of the patent application, and detachable from the image forming apparatus.