JP3970441B2 - Color toner for developing electrostatic image, method for producing the same, electrostatic image developer and image forming method - Google Patents

Description

【表２】

【０１０８】
【発明の効果】
本発明の静電荷像現像用カラートナーを用いることにより、従来得ることができなかった色特性である４０＜Ｌ＜６０、７０＜ａ＊＜８０、−１０＜ｂ＊＜５の条件を満足する定着画像を形成することが可能になる。
また、本発明の静電荷像現像用カラートナーは、帯電性、現像性、転写性、定着性、クリーニング性等の諸特性、特に光透過性、着色性に優れ、高画質と高信頼性とを満足するものであり、また、転写効率が高く、トナー消費量が少なく、しかも寿命の長い二成分系の静電荷像現像剤に好適である。
【０１０９】
本発明の静電荷像現像用カラートナーの製造方法によれば、着色剤や離型剤等の遊離を招くことなく、前記諸特性に優れた静電荷像現像用トナーを容易にかつ簡便に製造することができる。
【０１１０】
本発明の画像形成方法は、紙上およびＯＨＰフィルム上で、高彩度のフルカラー画像を容易にかつ簡便に形成することができる。また、クリーナーから回収されたトナーを再使用する、いわゆるトナーリサイクルシステムにおいても、適性が高く、光透過性、着色性に優れた高画質を得ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrostatic image developing toner used for developing an electrostatic image formed by an electrophotographic method or an electrostatic recording method, a production method thereof, an electrostatic image developer using the toner, and an image. It relates to a forming method.
[0002]
[Prior art]
A method for visualizing image information through an electrostatic charge image, such as electrophotography, is currently used in various fields. In electrophotography, an electrostatic charge image is formed on a photoreceptor by charging and exposure processes, the electrostatic charge image is developed with a developer containing toner, and visualized through a transfer and fixing process. Developers used in electrophotography include a two-component developer composed of a toner and a carrier, and a one-component developer using a magnetic toner or a non-magnetic toner alone. The toner particles in these developers are Usually, a thermoplastic resin is produced by a kneading and pulverizing method in which a thermoplastic resin is melt-kneaded together with a releasing agent such as a pigment, a charge control agent, and wax, cooled, finely pulverized, and further classified. To the surface of the toner particles produced by this kneading and pulverizing method, inorganic fine particles or organic fine particles are added as necessary in order to improve fluidity and cleaning properties.
[0003]
In the case of toner particles produced by an ordinary kneading and pulverizing method, the toner shape is indeterminate and the surface composition of the toner particles is not uniform. The shape and surface composition of the toner particles are not uniform depending on the grindability of the materials used and the conditions of the grinding process. Although the shape and surface composition of the toner particles vary slightly depending on the pulverization properties of the materials used and the conditions of the pulverization process, it is difficult to control the shape of the intended toner particles and the surface composition of the toner particles. In particular, when toner particles are produced using a material having high grindability, fine particles are often generated or the shape of the toner particles is changed due to mechanical force due to shearing force in the developing machine.
Due to these effects, in the two-component developer, the finely divided toner particles are fixed to the carrier to accelerate the charging deterioration of the developer, and in the one-component developer, the toner particle size distribution is increased due to the expansion of the toner particle size distribution. The image quality is liable to be deteriorated due to scattering or a decrease in developability due to a change in the shape of the toner particles.
[0004]
In addition, when the toner particle shape is indefinite, the fluidity is not sufficient even when a fluidity aid is added, and the fine particles of the fluidity aid are recessed in the toner particles by mechanical force such as shear force during use. In other words, the fluidity of the toner decreases with time, and developability, transferability, and cleaning properties deteriorate. Further, when such toner is collected by cleaning and returned to the developing machine for use again, the image quality is more likely to deteriorate. In order to prevent these phenomena, it may be possible to further increase the fluidity aid. However, in this case, there is a problem that a black spot is generated on the photosensitive member or the fluidity aid is scattered. is there.
[0005]
On the other hand, in the case of a toner internally containing a release agent such as wax, exposure to the release agent on the surface of the toner particles often occurs in combination with a thermoplastic resin. In particular, in the case of a toner in which a resin that is given elasticity by a high molecular weight component and is not easily pulverized, and a brittle wax such as polyethylene, polyethylene is often exposed on the surface of the toner particles. Such a toner is advantageous for releasability at the time of fixing and cleaning of untransferred toner from the photoreceptor, but the polyethylene on the surface of the toner particle is detached from the surface of the toner particle by a shearing force or the like in the developing machine, Since it easily shifts to a developing roll, a photoreceptor, a carrier, etc., there is a problem that these contaminations are likely to occur, and the reliability as a developer is lowered.
[0006]
Under such circumstances, in particular, as a means for producing toner in which the shape and surface composition of toner particles are intentionally controlled, toner is particularly actively produced by a wet production method. For example, a method proposed in Japanese Patent Laid-Open Nos. 63-2822749 and 6-250439 is a method in which a resin particle dispersion is prepared by emulsion polymerization or the like, and a colorant is dispersed in an aqueous medium (solvent). There has been proposed an emulsion polymerization aggregation method in which an agent dispersion is prepared, both are mixed and heated to form aggregated particles corresponding to the particle diameter of the toner, and the toner is produced by heating and fusing.
[0007]
In the case of these methods, it is necessary to prepare in advance a colorant dispersion in which a colorant is dispersed in an aqueous solvent, but it is difficult to control the average particle diameter of the colorant particles in the colorant dispersion, A toner having desired characteristics cannot be easily produced. In order to control the average particle size of the colorant particles in the colorant dispersion, the colorant particles are aggregated and dispersed in an aqueous medium (solvent) to a desired particle size without sedimentation or precipitation, and When forming aggregated particles together with resin particles, it is necessary to prepare a colorant dispersion that does not aggregate the colorant particles, but such a colorant dispersion is not easy to prepare. That is, when the average particle size of the colorant particles in the colorant dispersion is large, the colorant particles are settled or precipitated, the colorant particles are aggregated with coarse particles as the core, and the aggregated particles are formed together with the resin particles. Various problems such as liberation of the colorant, deterioration of chargeability due to exposure of the colorant to the surface of the toner particles, and deterioration of light transmittance of the toner due to coarse particles occur. Further, when the average particle diameter of the colorant particles in the colorant dispersion is small, problems such as insufficient colorability of the obtained toner occur.
[0008]
On the other hand, in recent years, the demand for higher image quality has increased, and in particular, in color image formation, a tendency to reduce the toner diameter and make the particle diameter uniform is remarkable in order to realize a high-definition image. When an image is formed using a toner having a wide particle size distribution, the toner on the fine powder side in the particle size distribution causes problems such as contamination of the developing roll, charging roll, charging blade, photoconductor, carrier, etc. and toner scattering. It becomes difficult to simultaneously realize image quality and high reliability. Further, such a toner having a wide particle size distribution has a problem that it is inferior in reliability even in a system having a cleaning function, a toner recycling function, and the like. In order to achieve high image quality and high reliability at the same time, it is necessary to sharpen the particle size distribution of the toner, to reduce the diameter and make the particle size uniform.
[0009]
In addition, with the demand for higher image quality, the number of cases where a hue equivalent to an output image from a printing press is desired is increasing.
Examples of red colorants include various pigments such as Watch Young Red, Permanent Red, Brilliantamine 3B, Brilliantamine 6B, DuPont Oil Red, Pyrazolone Red, Resol Red, Rhodamine B Lake, Lake Red C, Rose Bengal, and Quinacridone. Colorants such as various dyes such as azo and xanthene are used in combination of one or more. In general, hue, saturation, lightness, and light resistance are used to form clear full-color images. , OHP permeability, and dispersibility in the toner.
[0010]
In the past, toners have been produced using various combinations such as quinacridone, quinacridone-carmine, quinacridone-xanthene, quinacridone-azo, etc.
[0011]
With regard to the kneaded and pulverized toner, for example, Japanese Patent Application Laid-Open No. 10-97102 proposes a magenta toner having a color tone equivalent to that of printing ink and excellent in OHP permeability, saturation and brightness.
However, as in the emulsion polymerization aggregation method, in order to sufficiently incorporate these colorants while sharpening the particle size distribution of the toner, achieving a small size, uniform particle size, and shape controllability, the selection of the colorant and Control of the particle size distribution of the colorant particles in the colorant dispersion becomes important. In the case of the magenta colorant in the above publication, if the dispersion particle size of the colorant dispersion is too large, the colorant particles are released during the production process, or when the release agent particles are included, Due to this interaction, the release agent particles are liberated, and the encapsulating property in the toner is inhibited, and good colorability and fixing property cannot be obtained. As a result, there is a problem that a small particle size and a sharp particle size distribution cannot be obtained due to a shift in the toner particle size or a deterioration in the particle size distribution.
In addition, if the dispersed particle size of the colorant dispersion is too small, the colorant particles on the fine powder side may hinder shape control, and good flow characteristics, developability, and transferability are impaired, and high image quality is obtained. There is a problem that it becomes impossible.
[0012]
Further, in the methods described in JP-A-63-282749 and JP-A-6-250439, although toner particles can be produced satisfactorily, it is difficult to make a toner when the colorant is used. There are many cases. In particular, when a water-soluble component is contained, the colorant particles are not taken into the toner and desired colorability and fixability cannot be obtained.
[0013]
In recent digital full-color copiers and printers, a color image original is color-separated with B (blue), R (red), and G (green) filters, and then has a dot diameter of 20 to 70 μm corresponding to the original original. The latent image is developed using Y (yellow), M (magenta), C (cyan), and BK (black) developers using a subtractive color mixing action. In such copying machines, compared to conventional black and white machines, it is necessary to transfer a large amount of developer, and it is necessary to cope with a smaller dot diameter. The sharpness of toner strength and particle size distribution is becoming increasingly important. From the pursuit of high image quality, high-definition reproducibility with a wider color reproduction range is also important. In view of speeding up and energy saving of these copying machines, it is also necessary to improve the low-temperature fixing property. From these points, a toner having a sharp particle size distribution and a small particle size is desired. However, no toner for developing an electrostatic charge image that satisfies the above requirements has been present at present.
[0014]
[Problems to be solved by the invention]
The present invention eliminates the above-mentioned problems in conventional toners, and has the following characteristics: a color toner for developing an electrostatic image, a method for producing the same, and an electrostatic image developer and image formation using the color toner for developing an electrostatic image It aims to provide a method. That is, an object of the present invention is to develop an electrostatic image capable of forming a fixed image having color characteristics in the range of 40 <L <60, 70 <a * <80, −10 <b * <5. To provide color toners. Another object of the present invention is to
1. Toner for developing an electrostatic charge image having excellent chargeability, developability, transferability, fixing ability, cleaning property, etc., in particular, light transmittance and colorability, and satisfying high image quality and high reliability, and the electrostatic charge image thereof Providing an electrostatic charge image developer using a color toner for development;
2. To provide a color toner for developing an electrostatic image suitable for a two-component electrostatic image developer having high transfer efficiency, low toner consumption and long life,
3. To provide a method for producing a color toner for developing an electrostatic charge image that can easily and easily produce a toner for developing an electrostatic charge image having excellent properties without causing liberation of a colorant, a release agent, etc.,
4). To provide an image forming method capable of easily and conveniently forming a full color image with high saturation on paper and OHP, and
5. To provide an image forming method that can obtain a high-quality fixed image that is highly suitable in a so-called toner recycling system that reuses toner collected from a cleaner, and that is excellent in light transmittance and colorability.
It is in.
[0015]
[Means for Solving the Problems]
  The electrostatic image developing color toner of the present invention is formed by a process of aggregating particles in a dispersion in which particles containing at least resin particles are dispersed, and a process of fusing the aggregated particles by heating.,ColorantAs Pigment Violet 19 and Pigment Red 122Wherein the toner particles have an average volume particle size distribution of 1.25 or less, a toner shape factor of 100 to 135, and a volume average particle size of 2 to 9 μm. In the fixed imagethe aboveThe amount of colorant is 0.02 to 0.05 mg / cm²In this range, a fixed image is formed in which the color characteristics of the image satisfy the following conditions.
  40 <L <60, 70 <a * <80, −10 <b * <5
[0016]
  The toner particles areTwo types of pigments, Pigment Violet 19 and Pigment Red 122ContainThe
  The toner particles preferably contain 5 to 30% of a low softening point substance. Further, the toner particles preferably have a charge amount of -10 to -40 [mu] c / g.
[0017]
The color toner for developing an electrostatic charge image according to the present invention includes a coagulation step of coagulating particles in a dispersion in which particles containing at least resin particles are dispersed, and a manufacturing method including a step of heating and coalescing the coagulated particles. Can be manufactured.
In the method for producing a color toner for developing an electrostatic image in the present invention, the average particle diameter of the resin particles in the dispersion is preferably 1 μm or less. Further, the average particle diameter of the colorant particles in the dispersion is 0.05 to 0.5 μm, the particles of 0.03 μm or less are 5% by number or less, and the particles of 0.5 μm or more are less than 10% by number. Is preferred.
In the aggregation step, a metal salt compound or a metal salt polymer can be added to form aggregated particles. Moreover, it is preferable to add the fine particles to the aggregated particles in a plurality of times in the aggregated particle dispersion in which the aggregated particles are dispersed. In that case, it is preferable that at least one of the aggregated particles and the fine particles attached to the aggregated particles contains a colorant.
[0018]
The electrostatic image developer of the present invention comprises an electrophotographic carrier and an electrostatic image developing toner, and the electrostatic image developing toner is the color toner described above. In that case, the electrophotographic carrier preferably has a resin coating layer.
[0019]
  In the image forming method of the present invention, a latent image formed on a latent image carrier is developed with a developer, transferred onto a transfer body, and fixed, and includes at least resin particles as the developer. Formed by aggregating particles in a dispersion in which the particles are dispersed, and heating and coalescing the aggregated particlesCompletionA colorant having an average volume particle size distribution of 1.25 or less, a toner shape factor of 100 to 135, and a volume average particle size of 2 to 9 μmAs Pigment Violet 19 and Pigment Red 122In a fixed image formed on a transfer body using a color toner for developing an electrostatic image comprising toner particlesthe aboveThe amount of colorant is 0.02 to 0.05 mg / cm²And a fixed image in which the color characteristics of the image satisfy the following conditions is formed.
  40 <L <60, 70 <a * <80, −10 <b * <5
[0020]
A specific method of the image forming method of the present invention includes a step of forming a latent image on a latent image carrier, and an electrostatic latent image carrier using an electrostatic charge image developing layer on the developer carrier. A step of developing the electrostatic latent image, a step of transferring the toner image on the latent image carrier onto the transfer member, and a cleaning step of removing residual toner on the latent image carrier, and in that case It is preferable to include a step of transferring the color toner for developing an electrostatic image collected in the cleaning step to the developer layer.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
  The color toner for developing an electrostatic charge image of the present invention has an average volume particle size distribution of 1.25 or less, a toner shape factor of 100 to 135, and a volume average particle size of 2 to 9 μm.Pigment Violet 19 and Pigment Red 122 as colorantsContaining toner particles containingInThus, it is produced by a process of aggregating particles in a dispersion in which particles containing at least resin particles are dispersed, and a process of fusing the aggregated particles by heating. In the method for producing a color toner for developing an electrostatic image according to the present invention, a step of forming an aggregated particle dispersion in at least a dispersion in which resin particles are dispersed (aggregation step), and the aggregated particle dispersion It includes a step of fusing the agglomerated particles by heating the liquid (a fusing step). Between the agglomeration step and the fusing step, a fine particle dispersion in which fine particles are dispersed is added and mixed in the agglomerated particle dispersion. You may provide the process (attachment process) of making fine particles adhere to the said aggregated particle, and forming an attached particle. That is, the color toner for developing an electrostatic charge image of the present invention includes a first step (aggregation step) in which aggregated particles are formed in a dispersion in which at least resin particles are dispersed to prepare an aggregated particle dispersion, and the aggregated particles A second step (attachment step) in which a fine particle dispersion in which fine particles are dispersed in the dispersion is added and mixed to attach the fine particles to the agglomerated particles to form the attached particles, and the attached particles are heated and fused. You may manufacture by the method of including the 3rd process (fusion process) to do.
[0022]
In that case, it is desirable to perform the second step a plurality of times. In the second step, the fine particle dispersion is added and mixed in the aggregated particle dispersion prepared in the first step, and the fine particles are adhered to the aggregated particles to form adhered particles. The added fine particles correspond to particles newly added to the aggregated particles when viewed from the aggregated particles, and may be referred to as “additional particles” in this specification.
[0023]
In the present invention, examples of the adhering particles in the second step include release agent fine particles, resin fine particles, and colorant fine particles. Specific examples of the preferable second step include the following cases. That is, (1) in the second step, the release agent fine particle dispersion in which the release agent fine particles are dispersed is added and mixed in the aggregated particle dispersion, and the release agent fine particles are attached to the aggregated particles. After forming the particles, when the resin-containing fine particle dispersion in which the resin-containing fine particles are dispersed is added and mixed, and the resin-containing fine particles are further adhered to the adhered particles to form the adhered particles. After the step 2 is performed, the colorant fine particle dispersion in which the colorant fine particles are dispersed is added and mixed in the resin fine particle aggregated particle dispersion, and the colorant fine particles are adhered to the aggregated particles to form the adhered particles. When the resin-containing fine particle dispersion in which the resin-containing fine particles are dispersed is added and mixed, and the resin-containing fine particles are further adhered to the adhered particles to form the adhered particles, and (3) the second step is In the agglomerated particle dispersion, resin is contained. After adding resin-containing fine particles in which fine particles are dispersed and adhering the resin-containing fine particles to aggregated particles to form adhering particles, an inorganic fine particle dispersion in which inorganic fine particles are dispersed is added and mixed, and inorganic particles are added to the adhering particles. A preferable example is a case where fine particles are further adhered to form adhered particles.
[0024]
The method for adding and mixing the fine particle dispersion is not particularly limited. For example, the fine particle dispersion may be gradually and continuously performed, or may be divided into a plurality of steps. Thus, by adding and mixing the fine particles (additional particles), the generation of fine particles can be suppressed, and the particle size distribution of the resulting electrostatic image developing toner can be sharpened. If the addition and mixing are performed in stages divided into a plurality of times, a layer of the fine particles is layered stepwise on the surface of the aggregated particles, and the structural change or the like from the inside to the outside of the electrostatic image toner particles It is possible to have a composition gradient, improve the surface hardness of the particles, maintain the particle size distribution during fusion in the third step, suppress fluctuations thereof, and stabilize during fusion. It is advantageous in that the addition of a surfactant or a stabilizer such as a base or an acid is not required, and the amount of these additives can be suppressed to the minimum, and costs can be reduced and quality can be improved. It is.
[0025]
In the present invention, the resin particles used in the aggregation step and the resin fine particles used as the additional particles are formed from a thermoplastic polymer serving as a binder resin. For example, styrene, parachlorostyrene, α-methylstyrene Such as styrene, methyl acrylate, ethyl acrylate, n-propyl acrylate, lauryl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, lauryl methacrylate, methacrylic acid 2 -Esters having a vinyl group such as ethylhexyl, vinyl nitriles such as acrylonitrile and methacrylonitrile, vinyl ethers such as vinyl methyl ether and vinyl isobutyl ether, vinyl methyl ketone, vinyl ethyl ketone, vinyl isopropenyl ketone Homopolymers of monomers such as vinyl ketones, polyolefins such as ethylene, propylene, and butadiene, copolymers obtained by combining two or more of these, or mixtures thereof, as well as epoxy resins, polyester resins, polyurethane resins , Polyamide resins, cellulose resins, polyether resins, etc., non-vinyl condensation resins, mixtures of these with the vinyl resins, and graft weights obtained when polymerizing vinyl monomers in the presence of these polymers. Coalescence etc. can be given. These resins may be used alone or in combination of two or more.
[0026]
Among these resins, vinyl resins are particularly preferable. In the case of a vinyl resin, it is advantageous in that a resin particle dispersion can be easily prepared by emulsion polymerization or seed polymerization using an ionic surfactant or the like.
[0027]
The method for preparing the dispersion of resin particles is not particularly limited, and a method appropriately selected according to the purpose can be adopted. For example, it can be prepared as follows.
[0028]
When the resin in the resin particles is a homopolymer or copolymer (vinyl resin) of a vinyl monomer such as the ester having a vinyl group, the vinyl nitrile, the vinyl ether, or the vinyl ketone. The resin monomer particles made of a vinyl monomer homopolymer or copolymer (vinyl resin) are obtained by emulsion polymerization or seed polymerization of the vinyl monomer in an ionic surfactant. A dispersion obtained by dispersing in an ionic surfactant can be prepared.
[0029]
When the resin in the resin particles is a resin other than a homopolymer or copolymer of the vinyl monomer, the resin can be dissolved in an oily solvent having a relatively low solubility in water. The resin is dissolved in the oily solvent, and the dissolved product is added to water together with the ionic surfactant and the polymer electrolyte, and fine particles are dispersed using a dispersing machine such as a homogenizer, and then heated or decompressed. Thus, it can be prepared by evaporating the oily solvent.
[0030]
When the resin particles dispersed in the resin particle dispersion are composite particles containing components other than the resin particles, the dispersion in which these composite particles are dispersed is prepared, for example, as follows. Can do. For example, each component of the composite particles is dissolved and dispersed in a solvent, and then dispersed in water together with an appropriate dispersant as described above, and the solvent is removed by heating or decompression, emulsion polymerization, It can be prepared by a method of immobilizing by performing mechanical shearing or electroadsorption on the latex surface prepared by seed polymerization.
[0031]
The average particle size of the resin particles is desirably 1 μm or less, and more desirably 0.01 to 1 μm. When the average particle diameter of the resin particles exceeds 1 μm, the particle size distribution of the finally obtained electrostatic image developing toner becomes wide, or free particles are generated, leading to deterioration in performance and reliability. On the other hand, when the average particle diameter of the resin particles is within the above range, the above disadvantages are eliminated, uneven distribution among the toners is reduced, dispersion in the toners is improved, and variations in performance and reliability are reduced. It is advantageous. The average particle diameter of the resin particles can be measured using, for example, a microtrack.
[0032]
In the case of vinyl monomers, a resin particle dispersion can be prepared by carrying out emulsion polymerization or seed polymerization using an ionic surfactant or the like, and in the case of other resins, it is oily and water-soluble. If the resin is soluble in a solvent with a relatively low solubility, dissolve the resin in those solvents, disperse the particles in water with a disperser such as a homogenizer together with an ionic surfactant or polymer electrolyte, and then heat Alternatively, the resin dispersion can be prepared by evaporating the solvent under reduced pressure.
[0033]
  In the present invention,As a colorantTwo types of pigment violet 19 and pigment red 122Is used. The colorant dispersion can be prepared, for example, by dispersing the colorant in an aqueous medium such as the surfactant.
[0034]
In the present invention, the average particle diameter of the colorant particles in the colorant particle dispersion is desirably 0.5 μm or less, and more desirably 0.05 to 0.5 μm. When the average particle diameter of the colorant particles exceeds 0.5 μm, the particle size distribution of the finally obtained electrostatic image developing toner is broadened or free particles are generated, which leads to a decrease in performance and reliability. When the average particle diameter of the colorant particles is smaller than 0.05 μm, not only the colorability in the toner is lowered, but also the shape controllability that is one of the characteristics of the emulsion aggregation method is impaired, and the shape close to a true sphere. No toner can be obtained. Further, the number% of particles of 0.5 μm or more is preferably less than 10%, substantially preferably 0%. The presence of such coarse particles impairs the stability of the agglomeration process, and widens the particle size distribution as well as liberation of coarse colored particles. Further, the number% of particles of 0.03 μm or less is preferably 5% or less. The presence of such fine particles impairs the shape controllability in the fusion process, and a so-called smooth one having a shape factor SF1 of 135 or less cannot be obtained. On the other hand, when the average particle diameter, coarse particles, and fine particles of the colorant particles are within the above ranges, there is no such defect, and uneven distribution between the toners is reduced, and dispersion in the toners is improved. Further, it is advantageous that the variation in reliability is reduced. The average particle diameter of the colorant particles can be measured using, for example, a microtrack. In the present invention, the addition amount of the colorant is preferably set in the range of 1 to 20% by weight with respect to the toner particles.
[0035]
The dispersion obtained by dispersing other components (particles) such as the release agent and other internal additives is, for example, ionic surface active when the other components (particles) are release agents. It is dispersed in water together with a polymer electrolyte such as an agent, polymer acid or polymer base. It can be prepared by making the release agent fine particles by applying strong shearing using a homogenizer or a pressure discharge type disperser while heating to above the melting point of the release agent. When the other component (particle) is an inorganic particle or the like, it can be prepared by dispersing the inorganic particle or the like in an aqueous medium such as the surfactant.
[0036]
The average particle diameter of the other components (particles) is usually at most 1 μm (that is, 1 μm or less), and preferably 0.01 to 1 μm. When the average particle size exceeds 1 μm, the particle size distribution of the finally obtained electrostatic image developing toner is broadened or free particles are generated, which tends to deteriorate performance and reliability. On the other hand, when the average particle size is within the above range, there are no disadvantages, and the uneven distribution among the toners is reduced, the dispersion in the toners is improved, and the variation in performance and reliability is advantageous. The average particle diameter can be measured using, for example, a microtrack.
[0037]
Examples of the dispersion medium in the dispersion in which the resin particle dispersion, the colorant dispersion, and the other components (particles) are dispersed include an aqueous medium. Examples of the aqueous medium include water such as distilled water and ion exchange water, alcohols, and the like. These may be used individually by 1 type and may use 2 or more types together.
[0038]
The means for preparing the various dispersions is not particularly limited, and examples thereof include known dispersion apparatuses such as a rotary shear type homogenizer and a ball mill having a media, a sand mill, and a dyno mill.
[0039]
In the present invention, it is preferable to add a surfactant as a flocculant to the aqueous medium. Examples of the surfactant include anionic surfactants such as sulfate ester, sulfonate, phosphate, and soap; cationic surfactants such as amine salt type and quaternary ammonium salt type; polyethylene glycol Preferred examples include nonionic surfactants such as polyphenols, alkylphenol ethylene oxide adducts, and polyhydric alcohols. Among these, an ionic surfactant is preferable, and an anionic surfactant and a cationic surfactant are more preferable.
The nonionic surfactant is preferably used in combination with the anionic surfactant or the cationic surfactant. The said surfactant may be used individually by 1 type, and may use 2 or more types together.
[0040]
Specific examples of the anionic surfactant include fatty acid soaps such as potassium laurate, sodium oleate and sodium castor oil; sulfates such as octyl sulfate, lauryl sulfate, lauryl ether sulfate and nonylphenyl ether sulfate; lauryl sulfonate , Dodecyl sulfonate, dodecyl benzene sulfonate, triisopropyl naphthalene sulfonate, dibutyl naphthalene sulfonate, etc. Sulfonates such as lauryl phosphate, isopropyl phosphate, Phosphoric acid esters such as alkenyl phenyl ether phosphates; dialkyl sodium sulfosuccinates of sodium dioctyl sulfosuccinate, sodium lauryl sulfosuccinate 2, polyoxyethylene sulfo sulfosuccinate salts such as succinic acid lauryl disodium and the like.
[0041]
Specific examples of the cationic surfactant include laurylamine hydrochloride, stearylamine hydrochloride, oleylamine acetate, stearylamine acetate, stearylaminopropylamine acetate, and other amine salts; lauryltrimethylammonium chloride, dilauryldimethylammonium Chloride, distearyl ammonium chloride, distearyl dimethyl ammonium chloride, lauryl dihydroxyethyl methyl ammonium chloride, oleyl bispolyoxyethylene methyl ammonium chloride, lauroylaminopropyldimethylethylammonium ethosulphate, lauroylaminopropyldimethylhydroxyethylammonium perchlorate, alkylbenzene dimethyl Ammonium chloride, alkylto Such as quaternary ammonium salts such as ammonium chloride.
[0042]
Specific examples of the nonionic surfactant include polyoxyethylene octyl ether, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether and other alkyl ethers; Alkylphenyl ethers such as oxyethylene nonylphenyl ether; alkyl esters such as polyoxyethylene laurate, polyoxyethylene stearate, polyoxyethylene oleate; polyoxyethylene lauryl amino ether, polyoxyethylene stearyl amino ether, polyoxy Alkyl amines such as ethylene oleyl amino ether, polyoxyethylene soybean amino ether, polyoxyethylene beef tallow amino ether; Alkyl amides such as xylethylene lauric acid amide, polyoxyethylene stearic acid amide, polyoxyethylene oleic acid amide; vegetable oil ethers such as polyoxyethylene castor oil ether, polyoxyethylene rapeseed oil ether; lauric acid diethanolamide, stearin Alkanolamides such as acid diethanolamide and oleic acid diethanolamide; sorbitan ester ethers such as polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate And the like.
[0043]
In the present invention, a dispersion in which particles containing at least resin particles are dispersed is prepared by adding and mixing the resin particle dispersion or a dispersion composed of the colorant dispersion or other components to room temperature to By heating in the range of the glass transition temperature of the resin, the resin particles or the particles composed of the resin particles and the colorant or other components are aggregated to form aggregate particles. The average particle diameter of the aggregate fine particles is preferably in the range of 2 to 9 μm.
[0044]
When the resin particle dispersion and the colorant dispersion are mixed, the content of the resin particles may be 40% by weight or less, and preferably about 2 to 20% by weight. Further, the content of the colorant may be 50% by weight or less, and preferably about 2 to 40% by weight. Furthermore, the content of the other components (particles) may be a level that does not hinder the object of the present invention, and is generally very small, specifically about 0.01 to 5% by weight. Yes, about 0.5 to 2% by weight is preferable.
[0045]
When fine particles are added to the aggregated particles formed as described above by the second step, the aggregated particles are used as mother particles, and a coating layer of the fine particles (additional particles) is formed on the surface of the mother particles. It will have the structure which was made. The layer of fine particles (additional particles) may be one layer or two or more layers. Generally, the number of layers is the adhesion step in the method for producing an electrostatic charge image developing toner of the present invention. It is the same as the number of times performed.
[0046]
Next, the mixed liquid containing the aggregate particles obtained as described above is heat-treated at a temperature equal to or higher than the softening point of the resin, generally 70 to 120 ° C. to fuse the aggregate particles, and the toner particle-containing liquid ( Tona particle dispersion) is obtained.
[0047]
Next, the obtained toner particle-containing liquid is treated by centrifugal separation or suction filtration to separate the toner particles, and washed 1 to 3 times with ion exchange water. Thereafter, the toner particles are filtered off, washed 1 to 3 times with ion-exchanged water, and dried to obtain the color toner for developing an electrostatic image of the present invention.
[0048]
The color toner for developing an electrostatic charge image of the present invention obtained as described above needs to have a volume average particle size distribution (GSDv) of 1.25 or less. If it exceeds 1.25, the sharpness and resolution of the image will deteriorate. GSDv means the square root of the ratio of 84 cumulative volume% to 16 cumulative volume% in the volume particle size distribution.
[0049]
Further, in the color toner for developing an electrostatic charge image of the present invention, the average value SF1 [(maximum length squared × π / projected area) × 100/4] of the toner shape factor based on the image analysis is 100 to 135. is required. When the shape factor exceeds 135, the toner fluidity is deteriorated and the transferability from the initial stage is affected. The toner shape factor can be calculated as follows, for example. That is, the optical microscope of the toner dispersed on the slide glass is taken into a Luzex image analyzer through a video camera, the maximum length and the projected area of 100 or more toner particles are obtained, and the average value is calculated by the above formula. Is obtained.
[0050]
Furthermore, the color toner for developing an electrostatic charge image of the present invention needs to have a volume average particle diameter in the range of 2 to 9 μm, preferably in the range of 3 to 8 μm. When the volume average particle size is less than 2 μm, the chargeability tends to be insufficient, and developability may be deteriorated, and when it exceeds 9 μm, the resolution of the image may be deteriorated.
[0051]
In addition, the electrostatic charge image developing color toner of the present invention preferably has a charge amount in the range of 10 to 40 μC / g, and more preferably in the range of 15 to 35 μC / g. If the charge amount is less than 10 μC / g, background stains are likely to occur, and if it exceeds 40 μC / g, the image density is likely to decrease. The ratio of the charge amount in summer and the charge amount in winter of the toner for developing an electrostatic charge image is preferably in the range of 0.5 to 1.5, and more preferably in the range of 0.7 to 1.3. When the ratio is out of the preferred range, the toner is highly dependent on the environment, and the charging property is not stable.
[0052]
Furthermore, the color toner for developing an electrostatic charge image of the present invention is represented by a ratio (Mw / Mn) of a weight average molecular weight (Mw) and a number average molecular weight (Mn) measured using gel permeation chromatography. The molecular weight distribution is preferably in the range of 2 to 30, and more preferably in the range of 3 to 20. When the molecular weight distribution represented by the ratio (Mw / Mn) exceeds 30, the light transmittance and the colorability are not sufficient, especially when the electrostatic image developing toner is developed or fixed on the film. If the image projected by light transmission becomes a sharp and dark image or is a projection image that does not transmit and does not develop color, if it is less than 2, the viscosity of the toner at the time of high-temperature fixing becomes remarkable, and an offset phenomenon is likely to occur. Become. On the other hand, when the molecular weight distribution represented by the ratio (Mw / Mn) is within the above numerical range, the light transmittance and colorability are sufficient, and the viscosity of the toner for developing an electrostatic charge image during high-temperature fixing is reduced. And the occurrence of the offset phenomenon can be effectively suppressed.
[0053]
The toner for developing an electrostatic image of the present invention is excellent in various properties such as chargeability, developability, transferability, fixability, and cleanability, particularly in light transmittance and colorability in an image. In addition, since the various performances are stably exhibited and maintained without being affected by environmental conditions, the reliability is high. Further, the toner for developing an electrostatic charge image of the present invention is produced by the above-described method, so that the average particle size is small and the particle size distribution is sharp, unlike the case of producing by the kneading and pulverizing method.
[0054]
In addition, inorganic particles and organic particles may be added to the electrostatic image developing toner finally heated as described above as a fluidity aid, cleaning aid, abrasive, etc. Can do. Examples of inorganic particles include silica, alumina, titania, calcium carbonate, magnesium carbonate, tricalcium phosphate, cerium oxide, and all the particles that are usually used as external additives on the toner surface. Examples of the body include all particles usually used as external additives on the toner surface, such as vinyl resin, polyester resin, and silicone resin. Further, a lubricant can be added. Examples of the lubricant include fatty acid amides such as ethylene bisstearylamide and oleic acid amide, and fatty acid metal salts such as zinc stearate and calcium stearate.
[0055]
The electrostatic image developer of the present invention is not particularly limited except that it contains the above-described color toner for developing an electrostatic image, and can have an appropriate component composition depending on the purpose. For example, the color toner for developing an electrostatic image of the present invention may be used alone to prepare a one-component electrostatic image developer, or a two-component electrostatic image development in combination with a carrier. It may be prepared as an agent.
[0056]
The carrier is not particularly limited, and a known carrier can be used. For example, known resin-coated carriers described in JP-A Nos. 62-39879 and 56-11461 are known. Can use the carrier. The mixing ratio of the electrostatic image developing toner of the present invention and the carrier in the electrostatic image developer is not particularly limited and can be appropriately selected according to the purpose.
[0057]
The image forming method of the present invention includes an electrostatic latent image forming step, a toner image forming step, a transfer step, and a cleaning step. Each of these processes is a general process per se, and is described in, for example, Japanese Patent Application Laid-Open Nos. 56-40868 and 49-91231. The image forming method of the present invention can be carried out using an image forming apparatus such as a copier or a facsimile machine known per se. In the image forming method of the present invention, as a developer, the average volume particle size distribution produced by the above method is 1.25 or less, the toner shape factor is 100 to 135, and the volume average particle size is 2 to 2. Using an electrostatic image developing color toner comprising toner particles containing 9 μm colorant, the amount of the colorant in the fixed image formed on the transfer body is 0.02 to 0.05 mg / cm.²In this range, a fixed image is formed in which the color characteristics of the image satisfy the following conditions.
40 <L <60, 70 <a * <80, −10 <b * <5
A color image having a color characteristic in the above range could not be obtained in the past, but a fixed image having the color characteristic in the above range can be obtained by the image forming method of the present invention using the color toner of the present invention. Is possible.
[0058]
The electrostatic latent image forming step is a step of forming an electrostatic latent image on the electrostatic latent image carrier. The toner image forming step is a step of developing the electrostatic latent image with a developer layer on the developer carrier to form a toner image. The developer layer is not particularly limited as long as it contains the color toner for developing an electrostatic image of the present invention. The transfer process is a process of transferring the toner image onto the transfer body. The cleaning step is a step of removing the electrostatic charge image developer remaining on the electrostatic latent image carrier.
[0059]
In the image forming method of the present invention, an embodiment that further includes a recycling step is preferable. The recycling process is a process of transferring the electrostatic image developing toner collected in the cleaning process to the developer layer.
The image forming method including the recycling step can be performed using an image forming apparatus such as a toner recycling system type copying machine or facsimile machine. The present invention can also be applied to a recycling system in which the cleaning process is omitted and toner is collected simultaneously with development.
[0060]
【Example】
Examples of the present invention will be described below, but the present invention is not limited thereto.
<Preparation of resin particle dispersion (1)>
360 g of styrene
n-Butyl acrylate 40g
Acrylic acid 6g
24g dodecanethiol
Carbon tetrabromide 4g
After mixing and dissolving the above components, 8 g of a nonionic surfactant (Sanyo Kasei Co., Ltd .: Nonipol 400) and 12 g of an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) are ion-exchanged water. Disperse in 550 g in a flask, emulsify and slowly mix for 10 minutes, and then add 50 g of ion-exchanged water in which 4 g of ammonium persulfate is dissolved, and after purging with nitrogen, The mixture was heated in an oil bath until the contents reached 70 ° C., and emulsion polymerization was continued for 5 hours. Thereafter, the reaction solution was cooled to room temperature to prepare a resin particle dispersion (1) in which resin particles having a glass transition point of 60.5 ° C. and a weight average molecular weight of 19000 were dispersed.
[0061]
<Preparation of resin particle dispersion (2)>
280 g of styrene
120g of n-butyl acrylate
Acrylic acid 6g
What mixed the said component and melt | dissolved 8 g of nonionic surfactants (Sanyo Kasei Co., Ltd .: Nonipol 400) and 12 g of anionic surfactants (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) in 550 g of ion-exchanged water. Dissolved in a flask, emulsified and slowly mixed for 10 minutes, and then charged with 50 g of ion-exchanged water in which 4 g of ammonium persulfate was dissolved. After nitrogen replacement, the inside of the flask was stirred. The contents were heated in an oil bath until the content reached 70 ° C., and emulsion polymerization was continued for 5 hours. Thereafter, the reaction solution was cooled to room temperature to prepare a resin particle dispersion (2) in which resin particles having a glass transition point of 55.6 ° C. and a weight average molecular weight of 600,000 were dispersed.
[0062]
<Preparation of resin particle dispersion (3)>
Styrene 300g
n-Butyl acrylate 100g
Acrylic acid 6g
24g dodecanethiol
Carbon tetrabromide 4g
8 g of nonionic surfactant (manufactured by Sanyo Kasei Co., Ltd .: Nonipol 400) and 12 g of anionic surfactant (manufactured by Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) were added to 550 g of ion-exchanged water. Disperse in a flask, emulsify and slowly mix for 10 minutes, and then add 50 g of ion-exchanged water in which 4 g of ammonium persulfate (manufactured by Wako Pure Chemical Industries, Ltd.) is dissolved. After that, while stirring the inside of the flask, the contents were heated in an oil bath until the content reached 70 ° C., and emulsion polymerization was continued for 5 hours. Thereafter, the reaction solution was cooled to room temperature to prepare a resin particle dispersion (3) in which resin particles having a glass transition point of 58.5 ° C. and a weight average molecular weight of 30000 were dispersed.
[0063]
<Preparation of Colorant Particle Dispersion (1)>
C. I. Pigment Violet 19 50g
(Dainippon Ink Chemical Co., Ltd .: Fastogen
Super Red 7100Y-E)
Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) 10g
240g of ion exchange water
The above components were mixed, dispersed for 10 minutes using a homogenizer (IKA: Ultra Turrax 750), and then applied to a circulating ultrasonic disperser (NUS Seiki Seisakusho, RUS-600TCVP) to obtain a colorant particle dispersion ( 1) was produced. The average particle size of the colorant in the colorant dispersion (1) was 150 nm, 3.7% by number of particles of 0.03 μm or less, and 0.5% by number of particles of 0.5 μm or more.
[0064]
<Preparation of Colorant Particle Dispersion (2)>
C. I. Pigment Red 122 50g
(Daiichi Seika Kogyo Co., Ltd .: ECR-185)
Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) 10g
240g of ion exchange water
The above components were mixed to prepare a colorant particle dispersion (2) under the same conditions as (1). The average particle diameter of the colorant in the colorant dispersion (2) was 120 nm, 7.5% by number of particles of 0.03 μm or less, and 0.5% by number of particles of 0.5 μm or more.
[0065]
<Preparation of Colorant Particle Dispersion (3)>
C. I. Pigment Red 57.1 (manufactured by Dainichi Seika Kogyo Co., Ltd .:
6B1476T-7) 50g
Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) 10g
240g of ion exchange water
The above was mixed to prepare a colorant particle dispersion (3) under the same conditions as (1). The average particle diameter of the colorant in the colorant dispersion (3) was 250 nm, 0.5% by number of particles of 0.03 μm or less, and 11.5% of particles of 0.5 μm or more.
[0066]
<Preparation of Colorant Particle Dispersion (4)>
C. I. Pigment Red 122 50g
(Daiichi Seika Kogyo Co., Ltd. ECR-185)
Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) 5g
Ion exchange water 245g
The said component was mixed and the colorant particle dispersion liquid (4) was produced on the conditions similar to the case of a colorant particle dispersion liquid (1). The average particle diameter of the colorant in the colorant dispersion (4) was 180 nm, 8.5% by number of particles of 0.03 μm or less, and 1.0% by number of particles of 4.5 μm or more.
[0067]
<Preparation of release agent dispersion (1)>
50 g of paraffin wax (manufactured by Nippon Seiwa Co., Ltd .: HNP0190)
Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) 10g
240g of ion exchange water
The above components were mixed and dispersed for 10 minutes using a homogenizer (manufactured by IKA: Ultra Turrax 750), and then dispersed with a pressure discharge homogenizer to obtain a release agent dispersion (1) having a central particle size of 200 nm. It was.
[0068]
<Preparation of release agent dispersion (2)>
50 g of paraffin wax (Mitsui Petrochemical Co., Ltd .: 100P)
Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) 10g
240g of ion exchange water
The above components were mixed and dispersed under the same conditions as in the case of the release agent dispersion (1) to obtain a release agent dispersion (2) having a center particle size of 190 nm.
[0069]
Example 1
Resin particle dispersion (1) 140 g
Resin particle dispersion (2) 60g
Colorant dispersion (1) 20g
Colorant dispersion (4) 20g
Release agent dispersion (1) 20g
Cationic surfactant (manufactured by Kao Corporation: Sanizol B50) 1.5 g
(Aggregation process)
The above components were mixed and dispersed in a round stainless steel flask using a homogenizer (manufactured by IKA: Ultra Tarrax T50), and then heated to 50 ° C. while stirring the flask in an oil bath for heating. After maintaining at 50 ° C. for 60 minutes, the particle size was measured with a Coulter counter (manufactured by Coulter Inc .: Multisizer 2), and it was confirmed that 4.7 μm aggregated particles were formed. Further, the temperature of the heating oil bath was raised and held at 52 ° C. for 1 hour. When the particle size was measured, it was confirmed that aggregated particles having a particle size of 5.4 μm were generated.
[0070]
(Adhesion process)
To the dispersion containing the aggregated particles, 60 g of the resin particle dispersion (1) was slowly added, and the temperature of the heating oil bath was raised and maintained at 54 ° C. for 1 hour. When the particle size of the obtained adhered particles was measured, the particle size was 5.8 μm.
(Fusion process)
After adding 3 g of an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) to the above dispersion, the stainless steel flask was sealed and heated to 97 ° C. while continuing stirring using a magnetic seal. And held for 4 hours.
Thereafter, the mixture was cooled, filtered, washed 5 times with ion exchange water, and then dried using a vacuum dryer to obtain toner particles. The supernatant sample after filtration was almost colorless and transparent, and the release of the colorant and the release agent was not observed.
[0071]
<Evaluation of toner characteristics for electrostatic image development>
The particle size was measured with a Coulter counter and found to be 5.9 μm. The index GSD (v) indicating the range of the particle size distribution was as good as 1.20. A small amount was collected on a slide glass, and an image observed with an optical microscope was calculated with a Luzex image analyzer to calculate a shape factor SF1, which was 130 and had a potato shape.
As a result of observing the cross section of the toner for developing an electrostatic charge image using a transmission electron microscope (TEM), it was confirmed that the release agent was dispersed in the toner particles and the colorant was well dispersed. It was.
[0072]
Next, this electrostatic charge image developing toner was evaluated for chargeability with no external addition. As a result, Q / M was −25.3 μc / g in an environment of 28 ° C. and humidity of 85%. Had sex. Moreover, when it evaluated similarly also in 10 degreeC and 15% environment, it was -28.7 microc / g and the environmental difference was hardly recognized.
[0073]
<Manufacture of electrostatic charge image developer>
Hydrophobic silica (manufactured by Cabot: TS720) was added to 50 g of the toner for developing an electrostatic image, and blended by a sample mill.
The obtained mixture was weighed so that the toner concentration was 5% with respect to a ferrite carrier having an average particle size of 50 μm coated with 1% of a methacrylate resin (manufactured by Soken Chemical Co., Ltd.), and stirred and mixed for 5 minutes by a ball mill. An electrostatic charge image developer was prepared.
The chargeability of the obtained externally added toner was −28.5 μc / g in an environment of 28 ° C. and 85%. Moreover, it was -30.9 micro | micron | muc / g in 10 degreeC and 15% of environment.
[0074]
<Evaluation of electrostatic image developer>
Using the electrostatic charge image developer described above, an initial to 10000 sheet running test was performed with an image forming apparatus (manufactured by Fuji Xerox: A-COLOR 630 modified machine) to determine the chargeability before and after running, image density, and toner state. Observations were made.
Regarding the charging property, even after the endurance test of 10,000 sheets, the charge amount was extremely stable at −27.4 μc / g and showed excellent performance. Further, the image was clear with no background stain (fogging) or scattering, and the reflection density by X-Rite (404, manufactured by X-Rite Co.) was as good as 1.60. In addition, when evaluated in the same manner in an environment of 10 ° C. and 15%, the charge amount after the endurance test of 10,000 sheets was −29.3 μc / g, stable, without background stain (fogging) and scattering, A clear image was obtained, and the reflection density was as good as 1.62. 0.02 mg / cm of pigment amount per unit area²The color characteristics (L, a *, b *) were measured using X-Rite (manufactured by X-Rite: 968), and L = 48.4, a * = 72. .5, b * = − 7.9. The amount of pigment per unit area is 0.05 mg / cm.²As a result, L = 43.1, a * = 77.6, and b * = 2.2 were measured.
[0075]
Example 2
Resin particle dispersion (1) 200 g
Colorant dispersion (1) 20g
Colorant dispersion (4) 20g
Release agent dispersion (1) 40 g
Cationic surfactant 1.5g
(Aggregation process)
The above components were mixed and dispersed in a round stainless steel flask using Ultra Turrax T50 (manufactured by IKA), and then heated to 50 ° C. while stirring the flask in a heating oil bath. After maintaining at 50 ° C. for 60 minutes, the particle size was measured with a Coulter counter (manufactured by Coulter Inc .: Multisizer 2), and it was confirmed that aggregated particles having a particle size of 4.5 μm were produced. Further, the temperature of the heating oil bath was raised and held at 52 ° C. for 1 hour. When the particle size was measured, it was confirmed that aggregated particles having a particle size of 5.2 μm were produced.
[0076]
(Adhesion process)
To the dispersion containing the aggregated particles, 60 g of the resin particle dispersion (1) was slowly added, and the temperature of the heating oil bath was raised and maintained at 54 ° C. for 1 hour. When the particle size of the obtained adhered particles was measured, the particle size was 5.7 μm.
(Fusion process)
After adding 3 g of an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) to the above dispersion, the stainless steel flask was sealed and heated to 97 ° C. while continuing stirring using a magnetic seal. And held for 4 hours. Thereafter, the mixture was cooled, filtered, washed 5 times with ion exchange water, and then dried using a vacuum dryer to obtain toner particles. The supernatant sample after filtration was almost colorless and transparent, and the release of the colorant and the release agent was not observed.
[0077]
<Evaluation of toner characteristics for electrostatic image development>
The particle size was measured with a Coulter counter and found to be 5.9 μm. The index indicating the range of the particle size distribution was 1.21, which was good. Further, when a small amount of toner was collected on a slide glass and an image observed with an optical microscope was used to calculate a shape factor SF1 with a Luzex image analyzer, it was 128, which exhibited a smooth potato shape.
As a result of observing the cross section of the toner for developing an electrostatic charge image using a transmission electron microscope (TEM), it is found that the release agent substance is dispersed in the toner particles and the colorant substance is also well dispersed. Was confirmed.
[0078]
Next, this electrostatic charge image developing toner was evaluated for chargeability with no external addition. As a result, Q / M was −24.6 μc / g in an environment of 28 ° C. and humidity of 85%. Showed sex. Further, when the same evaluation was performed under an environment of 10 ° C. and 15%, it was −27.1 μc / g and almost no environmental difference was recognized.
[0079]
<Manufacture of electrostatic charge image developer>
Hydrophobic silica (manufactured by Cabot: TS720) was added to 50 g of the toner for developing an electrostatic image, and blended by a sample mill. The obtained mixture was weighed so that the toner concentration was 5% with respect to a ferrite carrier having an average particle size of 50 μm coated with 1% of a methacrylate resin (manufactured by Soken Chemical Co., Ltd.), and stirred and mixed for 5 minutes in a ball mill. An image developer was prepared.
The chargeability of the externally added toner of this developer was −26.3 μc / g in an environment of 28 ° C. and 85%. Further, it was −28.5 μc / g in an environment of 10 ° C. and 15%.
[0080]
<Evaluation of electrostatic image developer>
Using the above-mentioned electrostatic charge image developer, an initial-10000 sheet running test was carried out by an image forming apparatus (Fuji Xerox Co., Ltd., A-COLOR630 modified machine), and the chargeability before and after running, image density, and toner state Observations were made.
The chargeability was extremely stable at −25.5 μc / g even after running, and showed excellent performance. In addition, with respect to the image, a clear image was obtained without background stains or scattering even after the endurance test of 10,000 sheets, and the reflection density by X-Rite (manufactured by X-Rite: 404) was 1.58. It was good. When the same evaluation was conducted under an environment of 10 ° C. and 15%, the charge amount was stable at −28.1 μc / g even after the endurance test of 10,000 sheets, and there was no background stain (fogging) or scattering, and it was clear. An image was obtained, and the reflection density was as good as 1.60. The pigment amount per unit area is 0.02 mg / cm²When the color characteristics (L, a *, b *) of the image were measured using X-Rite (manufactured by X-Rite: 968), L = 49.5, a * = 72.0, b * = − 8.5. In addition, the pigment amount per unit area is 0.05 mg / cm²The fixed image was formed and measured in the same manner. L = 45.2, a * = 76.5, and b * = 3.0.
[0081]
Example 3
Resin particle dispersion (1) 140 g
Resin particle dispersion (2) 60g
Colorant dispersion (1) 20g
Colorant dispersion (4) 20g
Release agent dispersion (1) 40 g
Zinc chloride 3.0g
(Aggregation process)
The above components were mixed and dispersed in a round stainless steel flask using Ultra Turrax T50 (manufactured by IKA), and then heated to 50 ° C. while stirring the flask in a heating oil bath. After maintaining at 50 ° C. for 60 minutes, the particle size was measured with a Coulter counter (Multisizer 2 manufactured by Coulter, Inc.), and it was confirmed that aggregated particles having a particle diameter of 5.0 μm were formed. Further, the temperature of the heating oil bath was raised and held at 52 ° C. for 1 hour. When the particle size was measured, it was confirmed that aggregated particles having a particle size of 5.6 μm were formed.
[0082]
(Adhesion process)
To the dispersion containing the aggregated particles, 60 g of the resin particle dispersion (1) was slowly added, and the temperature of the heating oil bath was raised and maintained at 54 ° C. for 1 hour. When the particle size of the obtained adhered particles was measured, the particle size was 6.0 μm.
(Fusion process)
After adding 3 g of an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) to the above dispersion, the stainless steel flask was sealed and heated to 97 ° C. while continuing stirring using a magnetic seal. And held for 4 hours.
Thereafter, the mixture was cooled, filtered, washed 5 times with ion exchange water, and then dried using a vacuum dryer to obtain toner particles. The supernatant sample after filtration was almost colorless and transparent, and the release of the colorant and the release agent was not observed.
[0083]
<Evaluation of toner characteristics for electrostatic image development>
The particle size was measured with a Coulter counter and found to be 6.1 μm. The index GSDv indicating the range of the particle size distribution was as good as 1.20. Further, when a small amount was collected on a slide glass and an image observed with an optical microscope was used to calculate a shape factor SF1 with a Luzex image analyzer, it had a potato shape at 129. As a result of observing the cross section of the toner for developing an electrostatic charge image using a transmission electron microscope (TEM), it was confirmed that the release agent was dispersed in the toner particles and the colorant was well dispersed. It was.
Next, this electrostatic charge image developing toner was evaluated for chargeability with no external addition. As a result, Q / M was −23.1 μc / g in an environment of 28 ° C. and humidity of 85%. Had sex. Moreover, when it evaluated similarly also in 10 degreeC and 15% of environment, it was -25.2microc / g and the environmental difference was hardly recognized.
[0084]
<Manufacture of electrostatic charge image developer>
Hydrophobic silica (manufactured by Cabot: TS720) was added to 50 g of the toner for developing an electrostatic image, and blended by a sample mill. The obtained mixture was weighed so that the toner concentration was 5% with respect to a ferrite carrier having an average particle size of 50 μm coated with 1% of a methacrylate resin (manufactured by Soken Chemical Co., Ltd.), and stirred and mixed for 5 minutes by a ball mill. An electrostatic charge image developer was prepared.
The chargeability of the externally added toner was −25.4 μc / g in an environment of 28 ° C. and 85%. Further, it was −27.3 μc / g in an environment of 10 ° C. and 15%.
[0085]
<Evaluation of electrostatic image developer>
Using the electrostatic image developer described above, an initial-10000 sheet running test was performed with an image forming apparatus (manufactured by Fuji Xerox Co., Ltd .: A-COLOR 630 modified machine) to determine the chargeability before and after running, image density, and toner state. Observations were made.
Regarding the chargeability, the charge amount was as extremely stable as −24.5 μc / g even after the endurance test of 10,000 sheets, and showed excellent performance. Further, the image was clear with no background stain (fogging) or scattering, and the reflection density by X-Rite (manufactured by X-Rite: 404) was 1.57, which was good. Further, when the same evaluation was performed under an environment of 10 ° C. and 15%, the charge amount was stable at −25.7 μc / g even after the endurance test of 10,000 sheets, and there was no background stain (fogging) or scattering, and it was clear. An image was obtained, and the reflection density was as good as 1.58. The pigment amount per unit area is 0.02 mg / cm²When the color characteristics (L, a *, b *) of the image were measured using X-Rite (manufactured by X-Rite: 968), L = 48.0, a * = 71.8, b * = − 7.7. In addition, the pigment amount per unit area is 0.05 mg / cm²As a result, a fixed image of L = 44.7, a * = 78.0, and b * = 2.7 were obtained.
[0086]
Example 4
Resin particle dispersion (1) 140 g
Resin particle dispersion (2) 60g
Colorant dispersion (1) 20g
Colorant dispersion (4) 20g
Release agent dispersion (2) 40g
Zinc chloride 3.0g
(Aggregation process)
The above components were mixed and dispersed in a round stainless steel flask using Ultra Turrax T50 (manufactured by IKA), and then heated to 50 ° C. while stirring the flask in an oil bath for heating. After maintaining at 50 ° C. for 60 minutes, the particle size was measured with a Coulter counter (manufactured by Coulter Inc .: Multisizer 2), and it was confirmed that aggregated particles having a particle size of 4.5 μm were produced. Further, the temperature of the heating oil bath was raised and maintained at 52 ° C. for 2 hours. When the particle size was measured, it was confirmed that aggregated particles having a particle size of 5.4 μm were generated.
[0087]
(Adhesion process)
To the dispersion containing the aggregated particles, 60 g of the resin particle dispersion (1) was slowly added, and the temperature of the heating oil bath was raised and maintained at 54 ° C. for 1 hour.
The obtained adhered particles were measured to have a particle size of 5.7 μm.
[0088]
(Fusion process)
After adding 3 g of an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) to the above dispersion, the stainless steel flask was sealed and heated to 97 ° C. while continuing stirring using a magnetic seal. And held for 4 hours.
Thereafter, the mixture was cooled, filtered, washed 5 times with ion exchange water, and then dried using a vacuum dryer to obtain toner particles. The supernatant sample after filtration was almost colorless and transparent, and the release of the colorant and the release agent was not observed.
[0089]
<Evaluation of toner characteristics for electrostatic image development>
The particle size was measured with a Coulter counter and found to be 5.8 μm. The index GSD (v) indicating the particle size distribution was as good as 1.21. Further, when a small amount was collected on a slide glass and the shape factor SF1 of the image observed with an optical microscope was calculated by a Luzex image analyzer, it was 130 and had a potato shape.
As a result of observing the cross section of the toner for developing an electrostatic charge image using a transmission electron microscope (TEM), it was confirmed that the release agent was dispersed in the toner particles and the colorant was well dispersed. It was.
Next, when the electrostatic property of this electrostatic charge image developing toner was evaluated in an unadded state, the Q / M was −25.1 μc / g in an environment of 28 ° C. and a humidity of 85%. Had sex. Further, when the same evaluation was performed under an environment of 10 ° C. and 15%, it was −28.2 μc / g and almost no environmental difference was recognized.
[0090]
<Manufacture of electrostatic charge image developer>
Hydrophobic silica (Cabot, TS720) was added to 50 g of the electrostatic image developing toner described above, and blended in a sample mill. The obtained mixture was weighed so that the toner concentration would be 5% with respect to a ferrite carrier having an average particle size of 50 μm coated with 1% of a methacrylate resin (manufactured by Soken Chemical Co., Ltd.), stirred and mixed for 5 minutes with a ball mill. A charge image developer was prepared.
The chargeability of the obtained externally added toner was −26.4 μc / g in an environment of 28 ° C. and 85%. In addition, it was −27.5 μc / g in an environment of 10 ° C. and 15%.
[0091]
<Evaluation of electrostatic image developer>
Using this electrostatic charge image developer, an initial 10000-sheet running test was carried out with an image forming apparatus (Fuji Xerox Co., Ltd .: A-COLOR 630 modified machine) to determine the chargeability before and after running, image density, and toner state. Observations were made.
The chargeability was extremely stable at −23.7 μc / g even after running, and showed excellent performance. In addition, with respect to the image, a clear image was obtained without any background stain (fogging) or scattering even after the endurance test of 10,000 sheets, and the reflection density by X-Rite (manufactured by X-Rite: 404) was 1.52. It was good. In addition, when the same evaluation was performed under an environment of 10 ° C. and 15%, the charge amount was stable at −25.8 μc / g even after the endurance test of 10,000 sheets, and there was no background stain (fogging) or scattering, and it was clear. An image was obtained, and the reflection density was as good as 1.55. The pigment amount per unit area is 0.02 mg / cm²A fixed image was formed and the color characteristics (L, a *, b *) of the image were measured using X-Rite (manufactured by X-Rite: 968). L = 48.7, a * = 73 0.0, b * = − 7.2. In addition, the pigment amount per unit area is 0.05 mg / cm²As a result, a fixed image of L = 45.0, a * = 76.2, and b * = 3.0 were obtained.
[0092]
Example 5
Resin particle dispersion (3) 200 g
Colorant dispersion (1) 20g
Colorant dispersion (4) 20g
Release agent dispersion (1) 40 g
Cationic surfactant 1.5g
(Aggregation process)
The above components were mixed and dispersed in a round stainless steel flask using Ultra Turrax T50 (manufactured by IKA), and then heated to 50 ° C. while stirring the flask in an oil bath for heating. After maintaining at 50 ° C. for 90 minutes, the particle size was measured with a Coulter counter (Multisizer 2 manufactured by Coulter Inc.), and it was confirmed that aggregated particles having a particle size of 4.4 μm were formed. Further, the temperature of the heating oil bath was raised and held at 52 ° C. for 1 hour. When the particle size was measured, it was confirmed that aggregated particles having a particle size of 5.3 μm were formed.
[0093]
(Adhesion process)
To the dispersion containing the aggregated particles, 60 g of the resin particle dispersion (1) was slowly added, and the temperature of the heating oil bath was raised and maintained at 54 ° C. for 1 hour. When the particle size of the obtained adhered particles was measured, the particle size was 5.7 μm.
(Fusion process)
After adding 3 g of an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) to the above dispersion, the stainless steel flask was sealed and heated to 97 ° C. while continuing stirring using a magnetic seal. And held for 4 hours.
Thereafter, the mixture was cooled, filtered, washed 5 times with ion exchange water, and then dried using a vacuum dryer to obtain toner particles. The supernatant sample after filtration was almost colorless and transparent, and the release of the colorant and the release agent was not observed.
[0094]
<Evaluation of toner characteristics for electrostatic image development>
The particle size was measured with a Coulter counter and found to be 5.7 μm. The index GSD (v) indicating the particle size distribution was as good as 1.22. Further, when a small amount was collected on a slide glass and the shape factor SF1 was calculated by a Luzex image analysis apparatus using an image observed with an optical microscope, it was 129 and had a potato shape.
As a result of observing the cross section of the toner for developing an electrostatic image using a transmission electron microscope (TEM), it was confirmed that the release agent was dispersed in the toner particles and the colorant was also well dispersed. It was done.
Next, when the electrostatic property of this electrostatic charge image developing toner was evaluated with no external addition, Q / M was −24.2 μc / g in an environment of 28 ° C. and humidity of 85%, and good chargeability was obtained. Had sex. Moreover, when similarly evaluated in an environment of 10 ° C. and 15%, it was −26.1 μc / g and almost no environmental difference was recognized.
[0095]
<Manufacture of electrostatic charge image developer>
Hydrophobic silica (manufactured by Cabot: TS720) was added to 50 g of the toner for developing an electrostatic image, and blended by a sample mill. This mixture was weighed so that the toner concentration would be 5% with respect to a ferrite carrier having an average particle size of 50 μm coated with 1% methacrylate resin (manufactured by Soken Chemical Co., Ltd.), and stirred and mixed for 5 minutes with a ball mill to obtain an electrostatic charge image. A developer was prepared.
The chargeability of the obtained externally added toner was −25.4 μc / g in an environment of 28 ° C. and 85%. Further, it was −27.1 μc / g in an environment of 10 ° C. and 15%.
[0096]
<Evaluation of electrostatic image developer>
Using the above-mentioned electrostatic charge image developer, an initial to 10000 sheet running test was performed with an image forming apparatus (Fuji Xerox Co., Ltd .: A-COLOR 630 modified machine), and chargeability before and after running, image density, and toner state Was observed.
Regarding the chargeability, the charge amount was extremely stable at −22 μc / g even after running, and excellent performance was exhibited. In addition, with respect to the image, a clear image is obtained without any background stain (fogging) or scattering even after the endurance test of 10,000 sheets, and the reflection density by X-Rite (404, manufactured by X-Rite) is good at 1.50. Met. In addition, when similarly evaluated in an environment of 10 ° C. and 15%, the charge amount after running is as stable as −24 μc / g, and there is no background stain (fogging) or scattering even after the endurance test of 10,000 sheets. A clear image was obtained, and the reflection density was as good as 1.54. The pigment amount per unit area is 0.02 mg / cm²When the color characteristics (L, a *, b *) of the image were measured using X-Rite (manufactured by X-Rite: 968), L = 47.9, a * = 71.5, b * = − 8.0. In addition, the pigment amount per unit area is 0.05 mg / cm²As a result, a fixed image of L = 45.3, a * = 77.0, and b * = 3.3 were obtained.
[0097]
Comparative Example 1
Resin particle dispersion (1) 140 g
Resin particle dispersion (2) 60g
Colorant dispersion (2) 40g
Release agent dispersion (1) 40 g
Cationic surfactant (manufactured by Kao Corporation: Sanizol B50) 1.5 g
(Aggregation process)
The above components were mixed and dispersed in a round stainless steel flask using Ultra Turrax T50 (manufactured by IKA), and then heated to 50 ° C. while stirring the flask in a heating oil bath. After maintaining at 50 ° C. for 60 minutes, the particle size was measured with a Coulter counter (Multisizer 2 manufactured by Coulter Inc.), and it was confirmed that aggregated particles having a particle size of 5.1 μm were formed. Further, the temperature of the heating oil bath was raised and held at 52 ° C. for 1 hour. When the particle size was measured, it was confirmed that aggregated particles having a particle diameter of 5.5 μm were generated.
[0098]
(Adhesion process)
To the dispersion containing the aggregated particles, 60 g of the resin particle dispersion (1) was slowly added, and the temperature of the heating oil bath was raised and maintained at 54 ° C. for 1 hour. When the particle size of the obtained adhered particles was measured, the particle size was 5.8 μm.
(Fusion process)
After adding 3 g of an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) to the above dispersion, the stainless steel flask was sealed and heated to 97 ° C. while continuing stirring using a magnetic seal. And held for 4 hours.
Thereafter, the mixture was cooled, filtered, washed 5 times with ion exchange water, and then dried using a vacuum dryer to obtain toner particles. The supernatant sample after filtration was almost colorless and transparent, and the release of the colorant and the release agent was not observed.
[0099]
<Evaluation of toner characteristics for electrostatic image development>
The particle size was measured with a Coulter counter and found to be 5.9 μm. The index GSD (v) indicating the range of the particle size distribution was 1.22. Further, when a small amount was collected on a slide glass and the shape factor SF1 was calculated with the Luzex image analyzer from the image observed with the optical microscope, it had a potato shape at 130.
As a result of observing the cross section of the toner for developing an electrostatic charge image using a transmission electron microscope (TEM), it was confirmed that the release agent was dispersed in the toner particles and the colorant was well dispersed. It was.
Next, when the electrostatic property of this electrostatic charge image developing toner was evaluated with no external addition, the Q / M was as good as −24.5 μc / g in an environment of 28 ° C. and 85% humidity. Further, when the same evaluation was performed under an environment of 10 ° C. and 15%, it was −27.3 μc / g and almost no environmental difference was recognized.
[0100]
<Manufacture of electrostatic charge image developer>
Hydrophobic silica (TS720: manufactured by Cabot) was added to 50 g of the electrostatic image developing toner described above, and blended in a sample mill. The obtained mixture was weighed so that the toner concentration would be 5% with respect to a ferrite carrier having an average particle size of 50 μm coated with 1% of a methacrylate resin (manufactured by Soken Chemical Co., Ltd.), stirred and mixed for 5 minutes with a ball mill. A charge image developer was prepared.
The charge amount of the obtained externally added toner was −25.3 μc / g in an environment of 28 ° C. and 85%. Further, it was −28.5 μc / g in an environment of 10 ° C. and 15%.
[0101]
<Evaluation of electrostatic image developer>
Using this electrostatic charge image developer, an initial 10000-sheet running test was carried out with an image forming apparatus (Fuji Xerox Co., Ltd .: A-COLOR 630 modified machine) to determine the chargeability before and after running, image density, and toner state. Observations were made.
The chargeability was extremely stable at −24.3 μc / g even after the endurance test of 10,000 sheets, and showed excellent performance. In addition, the image is free of background stains (fogging) and scattering, and a clear image can be obtained even at the endurance of 10,000 sheets. The reflection density by X-Rite (manufactured by X-Rite: 404) is as good as 1.53. It was. When the same evaluation was made under an environment of 10 ° C. and 15%, the charge amount after the endurance test of 10,000 sheets was stable at −25.7 μc / g, and there was no background stain (fogging) or scattering, and a clear image was obtained. As a result, the reflection density was as good as 1.55. The pigment amount per unit area is 0.02 mg / cm²When the color characteristics (L, a *, b *) of the fixed image were measured using X-Rite (968, manufactured by X-Rite), L = 52.0, a * = 68. 0.0, b * = − 17.0. In addition, the pigment amount per unit area is 0.05 mg / cm²When a fixed image was formed, L = 43.0, a * = 75.0, b * = − 7.9, and a considerably bluish color was exhibited.
[0102]
Comparative Example 2
Resin particle dispersion (1) 140 g
Resin particle dispersion (2) 60g
Colorant dispersion (3) 40g
Release agent dispersion (1) 40 g
Cationic surfactant (Kani Sanisol B50) 1.5g
(Aggregation process)
The above components were mixed and dispersed in a round stainless steel flask using Ultra Turrax T50 (manufactured by IKA), and then heated to 50 ° C. while stirring the flask in a heating oil bath. After maintaining at 50 ° C. for 60 minutes, the particle size was measured with a Coulter counter (manufactured by Coulter Inc .: Multisizer 2), and it was confirmed that aggregated particles having a particle diameter of 5.0 μm were produced. Further, the temperature of the heating oil bath was raised and held at 52 ° C. for 1 hour. When the particle size was measured, it was confirmed that aggregated particles having a particle size of 5.3 μm were formed.
[0103]
(Adhesion process)
To the dispersion containing the aggregated particles, 60 g of the resin particle dispersion (1) was slowly added, and the temperature of the heating oil bath was raised and maintained at 54 ° C. for 2 hours. When the particle size of the obtained adhered particles was measured, the particle size was 5.7 μm.
(Fusion process)
After adding 3 g of an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd .: Neogen SC) to the above dispersion, the stainless steel flask was sealed and heated to 97 ° C. while continuing stirring using a magnetic seal. Hold for 4 hours.
Thereafter, the mixture was cooled, filtered, washed 5 times with ion exchange water, and then dried using a vacuum dryer to obtain toner particles. The supernatant sample after filtration was colored red and the release of the colorant was observed.
[0104]
<Evaluation of toner characteristics for electrostatic image development>
When the particle size was measured with a Coulter counter, it was 6.1 μm, and the index GSD (v) indicating the range of the particle size distribution was 1.30, indicating a tendency of deterioration. Further, when a small amount was collected on a slide glass and the shape factor SF1 was calculated by using a Luzex image analyzer for an image observed with an optical microscope, it was 142, which had an indefinite shape.
As a result of observing a cross section of the toner for developing an electrostatic charge image using a transmission electron microscope (TEM), it was confirmed that the release agent was dispersed in the toner particles, but the dispersion of the colorant was deteriorated. did it.
Next, this electrostatic charge image developing toner was evaluated for chargeability with no external addition. As a result, Q / M was −7.5 μc / g in an environment of 28 ° C. and humidity of 85%, and low charge. It was an amount. Further, when the same evaluation was performed under an environment of 10 ° C. and 15%, a low charging property of −8.6 μc / g was shown.
[0105]
<Manufacture of electrostatic charge image developer>
Hydrophobic silica (Cabot, TS720) was added to 50 g of the electrostatic image developing toner described above, and blended in a sample mill. The obtained mixture was weighed so that the toner concentration would be 5% with respect to a ferrite carrier having an average particle size of 50 μm coated with 1% of a methacrylate resin (manufactured by Soken Chemical Co., Ltd.), stirred and mixed for 5 minutes with a ball mill. A charge image developer was prepared.
The chargeability of the obtained externally added toner was −8.6 μc / g in an environment of 28 ° C. and 85%. Moreover, it was -9.8 (micro | micron | mu) c / g in 10 degreeC and 15% of environment.
[0106]
<Evaluation of electrostatic image developer>
Using the above-mentioned electrostatic charge image developer, an initial to 10000 sheet running test was performed with an image forming apparatus (Fuji Xerox Co., Ltd .: A-COLOR 630 modified machine), and chargeability before and after running, image density, and toner state Was observed.
The chargeability was greatly reduced to −3.7 μc / g after running. In the image, background stain (fogging) and toner scattering due to low chargeability were observed from the beginning, and image blurring due to low transferability occurred. Further, the reflection density by X-Rite (manufactured by X-Rite: 404) was as low as 1.21. When evaluated in the same manner even at an environment of 10 ° C. and 15%, the charge amount after running shows a tendency to decrease to −6.5 μc / g, background stain (fogging) occurs from about 100 sheets, and the reflection density is 1. It was as low as .27. The amount of pigment per unit area is 0.02 mg / cm²When the color characteristics of the image were evaluated using X-Rite (manufactured by X-Rite: 968), L = 50.0, a * = 70.3, b * = 3. It was 5. In addition, the pigment amount per unit area is 0.05 mg / cm²When a fixed image was formed, L = 43.5, a * = 76.8, and b * = 8.3.
[0107]
The results of the above Examples and Comparative Examples are summarized in Table 1 and Table 2 below.
[Table 1]

[Table 2]

[0108]
【The invention's effect】
By using the color toner for developing an electrostatic charge image of the present invention, the color characteristics that could not be obtained conventionally are satisfied: 40 <L <60, 70 <a * <80, −10 <b * <5. It is possible to form a fixed image.
Further, the color toner for developing an electrostatic image of the present invention is excellent in various properties such as chargeability, developability, transferability, fixability, and cleaning properties, particularly light transmittance and colorability, and has high image quality and high reliability. In addition, it is suitable for a two-component electrostatic charge image developer having high transfer efficiency, low toner consumption, and long life.
[0109]
According to the method for producing a color toner for developing an electrostatic image of the present invention, the toner for developing an electrostatic image having excellent properties can be easily and easily produced without causing the release of a colorant, a release agent, or the like. can do.
[0110]
The image forming method of the present invention can easily and easily form a high-saturation full-color image on paper and an OHP film. Further, even in a so-called toner recycling system that reuses toner collected from a cleaner, it is possible to obtain high image quality with high suitability and excellent light transmittance and colorability.

Claims (4)

Particles containing at least resin particles are formed by the process of fusing with a heating step to agglomerate the particles in the dispersion are dispersed, and the aggregated particles, the toner particles containing Pigment Violet 19 and Pigment Red 122 as a coloring agent An electrostatic charge developing color toner, wherein the toner particles have an average volume particle size distribution of 1.25 or less, a toner shape factor of 100 to 135, and a volume average particle size of 2 to 9 μm. , in the case to the amount of the coloring agent in the fixed image 0.02 ranging from 0.05 mg / cm ^2, a color toner for developing an electrostatic image color characteristics of the image to form a fixed image that satisfies the following conditions .
40 <L <60, 70 <a * <80, −10 <b * <5   2. The electrostatic charge image developing according to claim 1, comprising an aggregating step of aggregating particles in a dispersion in which particles containing at least resin particles are dispersed, and a step of heating and aggregating the aggregated particles. Manufacturing method of color toner.   An electrostatic charge image developer comprising an electrophotographic carrier and an electrostatic charge image developing toner, wherein the electrostatic charge image developing toner is the color toner according to claim 1. In an image forming method in which a latent image formed on a latent image carrier is developed with a developer, transferred onto a transfer body, and fixed, in a dispersion in which particles containing at least resin particles are dispersed as a developer Formed by the steps of agglomerating the particles and the step of fusing the aggregated particles by heating, the average volume particle size distribution is 1.25 or less, the toner shape factor is 100 to 135, and the volume average particle size is 2 of ～9Myuemu, the amount of the colorant Pigment violet 19 and using a color toner for developing electrostatic images formed of toner particles containing a pigment red 122, in a fixed image formed on the transfer member as a coloring agent 0.02 An image forming method characterized by forming a fixed image in a range of 0.05 mg / cm ² and color characteristics of the image satisfying the following conditions.
40 <L <60, 70 <a * <80, −10 <b * <5