JPH112922A - Manufacturing method of toner for developing electrostatic charge image, toner manufactured by the method and image forming method using the toner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance reliability while making the various kinds of characteristics such as color developing property, electrifying property, developing property, transfer property, fixation and OHP permeability, specially, the color developing property and the OHP permeability compatible with each other. SOLUTION: In this manufacturing method, resin grain dispersion liquid in which at least resin grains are dispersed, colorant grain dispersion liquid in which at least colorant grains are dispersed and releasing agent grain dispersion liquid in which at least releasing agent grains are dispersed are mixed, first. Then, the grains are aggregated. Thereafter, the aggregate grains are heated and fused. The releasing agent grains of the releasing agent grain dispersion liquid in which the grains of <=0.5 μm ad >=1.0 μm in volume average grain size is <=5% is used. Besides, at least one process that grain dispersion liquid is added and mixed further is included after the grains are aggregated and before they are fused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention efficiently manufactures a toner for developing an electrostatic charge image which is excellent in various properties such as color developing property and OHP transparency and is preferably used in forming an image by electrophotography or the like. The present invention relates to a method, an electrostatic image developing toner produced by the method, an electrostatic image developer containing the electrostatic image developing toner, and an image forming method using the electrostatic image developing toner.

[0002]

2. Description of the Related Art Methods of visualizing image information via an electrostatic image, such as electrophotography, are currently widely used in various fields. In the electrophotographic method, a charging step,
Forming an electrostatic image on the photoreceptor through an exposure step and the like, and developing the electrostatic image using a developer containing toner particles,
The electrostatic image is visualized through a transfer step, a fixing step, and the like. As the developer, a two-component developer containing toner particles and carrier particles, and a one-component developer containing magnetic toner particles or non-magnetic toner particles are known. The toner particles in the developer are usually manufactured by a kneading and pulverizing method. In this kneading and pulverizing method, a thermoplastic resin or the like is melt-kneaded together with a pigment, a charge controlling agent, a release agent such as wax, and the like. After cooling, the melt-kneaded material is finely pulverized, and the resultant is classified to obtain desired toner particles. It is a manufacturing method. Incidentally, the toner particles produced by the kneading and pulverizing method, for the purpose of improving fluidity and cleaning properties, etc.,
Further, if necessary, inorganic and / or organic fine particles are further added to the surface.

[0003] In the case of toner particles produced by the above-mentioned kneading and pulverizing method, usually the shape is irregular and the surface composition is not uniform. Although the shape and surface composition of the toner particles slightly change depending on the pulverizability of the materials used and the conditions of the pulverization process, it is difficult to intentionally control these to a desired degree. Further, in the case of a toner produced by a kneading and pulverizing method using a material having particularly high pulverizability, the powder may be further pulverized or its shape may be changed by mechanical forces such as various shearing forces in a developing machine. It often happens. As a result, in the two-component developer, the finely divided toner particles adhere to the carrier surface to accelerate the charge deterioration of the developer, or in the one-component developer, the particle size distribution increases. In addition, there arises a problem that finely divided toner particles are scattered, or the developing property is reduced due to a change in the toner shape, and the image quality is deteriorated. When the shape of the toner particles is irregular, the fluidity is not sufficient even when a fluidity aid is added, and the fine particles of the fluidity aid are depressed in the toner particles by mechanical force such as shear force during use. And buried in the inside thereof, and there is a problem that the fluidity decreases over time and the developing property, transfer property, cleaning property, etc. deteriorate. Further, if such toner is collected by a cleaning process, returned to the developing device and reused, there is a problem that image quality is likely to deteriorate. In order to prevent these problems, it is conceivable to further increase the amount of the flow aid. However, in this case, there arises a problem that black spots are generated on the photoreceptor and particles of the flow aid are scattered.

On the other hand, in the case of a toner in which a release agent such as wax is internally added, depending on the combination with a thermoplastic resin,
The release agent may be exposed on the surface of the toner particles.
In particular, in the case of a toner obtained by combining a resin which is imparted with elasticity by a high molecular weight component and is hardly pulverized, and a brittle wax such as polyethylene, polyethylene is often exposed on the surface of the toner particles. Although such a toner is advantageous for the releasability at the time of fixing and cleaning of the untransferred toner from the photoreceptor, the polyethylene on the surface of the toner particles is affected by mechanical force such as shearing force in a developing machine. Since the toner particles are easily separated from the toner particles and easily transferred to a developing roll, a photoreceptor, a carrier, or the like, there is a problem that these are easily contaminated and the reliability as a developer is reduced.

Under these circumstances, in recent years, as means for producing toner in which the shape and surface composition of particles are intentionally controlled, Japanese Patent Application Laid-Open Nos.
Japanese Patent No. 50439 proposes an emulsion polymerization aggregation method. In the emulsion polymerization aggregation method, a resin dispersion liquid is prepared by emulsion polymerization, a colorant dispersion liquid in which a colorant is dispersed in a solvent is prepared, and a mixing step of mixing these is performed. This is a method including an aggregation step of forming particles and a fusion step of fusing the aggregated particles by heating. According to this emulsion polymerization aggregation method, the toner shape can be arbitrarily controlled from an irregular shape to a spherical shape by selecting a heating temperature condition. Further, by adding a release agent dispersion such as wax in the mixing step, the release agent can be easily added to the toner.

[0006]

However, when a mold release agent is internally added in the emulsion polymerization coagulation method, Japanese Patent Application Laid-Open No.
As shown in FIG. 1, if the particle size of the release agent is too small, there is no effect of improving the fixing property. If it is larger, there is a problem that it is not included in the aggregated particles in the aggregation step, or the release agent particles fall off in the fusion step. In particular, when obtaining a color toner,
If the release agent particles are large, there is a problem that the OHP transmittance decreases due to irregular reflection and the color reproducibility also decreases. Further, when an attempt is made to disperse a substance such as a release agent, Japanese Patent Application Laid-Open No.
As can be seen in 977, the final attained particle size when using a homomixer type disperser such as a sand ground mill or a rotor stator is several microns, and it can be used as it is in the emulsion polymerization coagulation method for the above reasons. Did not.
An object of the present invention is to solve such problems and achieve the following objects. In other words, the present invention is a highly reliable electrostatic image development capable of achieving both properties such as color developability, chargeability, developability, transferability, fixing properties, and transparency, particularly, color developability, transparency and fixability. An object of the present invention is to provide a color toner and an electrostatic image developer containing the color toner for developing an electrostatic image. Another object of the present invention is to provide a method of manufacturing a color toner for developing an electrostatic image, which can easily and easily manufacture the color toner for developing an electrostatic image. Still another object of the present invention is to provide an image forming method capable of easily and easily forming a high-quality and highly reliable image.

[0007]

Means for Solving the Problems In order to solve the above problems, the inventors of the present invention have conducted intensive studies on the particle size and the amount of release agent particles used in the emulsion polymerization aggregation method. By making the dispersion diameter of the particles smaller than the wavelength region of visible light, the color developing property and OHP permeability of the color toner can be improved as compared with the conventional one, and the deviation of the release agent particles in the aggregation step and the fusion step is reduced. It has been found that a color toner excellent in fixing characteristics can be obtained by increasing the amount of the release agent added and the internal addition amount of the release agent.
In addition, as a method of preparing release agent fine particles, the release agent is heated and melted, and emulsified using an emulsifying disperser classified as a high-pressure homogenizer, so that the particle size is smaller than the wavelength region of visible light. It has become possible to prepare a dispersion of the present invention, which has led to the present invention. The present invention is based on the findings by the inventors of the present invention, and the means for solving the above problems are as follows.

[0008] That is, Mixing a resin particle dispersion in which at least resin particles are dispersed, a colorant particle dispersion in which at least colorant particles are dispersed, and a release agent particle dispersion in which at least release agent particles are dispersed, Aggregating the particles of the above, and a method for producing a toner for developing an electrostatic image, which comprises a step of fusing the aggregated particles by heating, wherein the release agent particles of the release agent particle dispersion have a volume average particle size. 0.5μ
m, and particles having a particle size of 1.0 μm or more are 5% or less.

[0009] 2. The production method according to the above-mentioned 1, further comprising at least one step of additionally mixing a particle dispersion after the step of aggregating the particles and before the step of fusing.

[0010] 3. In the above-mentioned production method, the release agent particle dispersion is obtained by heating a dispersion slurry containing at least the release agent and the dispersant to a temperature equal to or higher than the glass transition temperature of the release agent. A production method obtained by cooling after emulsification.

The present invention enables the following. 1. When the dispersion diameter of the release agent is smaller than the wavelength region of visible light, deviation of the release agent can be prevented in the aggregation step and the fusion step, and uniform and high-quality toner particles can be stably produced. 2. When the dispersion diameter of the release agent is smaller than the wavelength region of visible light, the color development of the toner is improved, and the OHP transmittance is increased. 3. The amount of the release agent added to the toner can be increased, and a toner having excellent fixing characteristics can be produced. 4. Even when the amount of the release agent added is large, a toner having excellent powder characteristics can be prepared by coating the toner surface. 5. The release agent particles can be dispersed to a particle size smaller than the wavelength region of visible light.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The method for producing a toner for developing an electrostatic image of the present invention includes at least a mixed liquid preparation step, an aggregated particle forming step and a coalescing step. In addition, the method for producing a toner for developing an electrostatic image of the present invention may include a step of additionally mixing a particle dispersion after the agglomerated particle forming step and before the fusing step. Furthermore, in the present invention, other steps can be included as needed.

[0013] The mixed liquid preparation step comprises the steps of: dispersing a resin particle in a dispersant; a colorant particle dispersion in which colorant particles are dispersed in a dispersant; This is a step of preparing a mixed solution by mixing with a release agent particle dispersion obtained by dispersing release agent particles. The resin particle dispersion can be used by mixing resin particles having different properties such as molecular weight. The aggregated particle forming step is a step of forming aggregated particles in the mixture to prepare an aggregated particle dispersion. The adhering particle forming step is a step of adding and mixing a resin particle dispersion obtained by dispersing resin particles in a dispersant into the agglomerated particle dispersion, and adhering the fine particles to the agglomerated particles to form adhered particles. It is.

In the method for producing a toner for developing an electrostatic image of the present invention, in the mixed liquid preparation step, resin particles, colorant particles and release agent particles are uniformly dispersed and mixed in the mixed liquid. At this time, depending on the type of the colorant particles, the colorant particles and the release agent particles may partially aggregate, and this can be prevented by appropriately selecting the type of the dispersant used in the release agent particle dispersion. It is possible.

In the agglomerated particle forming step, resin particles, colorant particles, release agent particles, etc., which are uniformly dispersed in the mixture, are aggregated to form agglomerated particles. Since the release agent particles are sufficiently fine particles substantially the same as the resin particles and the colorant particles, they are uniformly dispersed in the aggregated particles and do not hinder the dispersion of the colorant particles. In addition, since the particle size of the release agent particles is small, the uniformity of the aggregated particles can be maintained even if a large amount of the release agent is added, which is advantageous for the fixing characteristics of the toner.

In the fusing step, the resin in the agglomerated particles is melted and fused to form toner particles for electrostatic image development.

The present invention may include a step of additionally mixing the particle dispersion after the aggregated particle forming step and before the coalescing step. In this case, an aggregated particle layer is formed around the aggregated particles as base particles, and toner particles for electrostatic image development having a layer structure are formed by the subsequent fusing step. For example, in the case of a color toner using a multi-color toner, in the first step, after mixing the resin particle dispersion, the pigment particle dispersion and the release agent particle dispersion to aggregate the particles to form mother aggregated particles, The resin particle dispersion is additionally mixed, and additional resin particles are attached to the surface of the mother aggregated particles. Finally, the mixture is heated and coalesced. Then, even when a large amount of the release agent is added, the toner in which the release agent does not exist on the surface can be produced by attaching the resin particles in the additional mixing step of the particle dispersion. In the present invention, as a result of intensive examination of the aggregation process conditions, the initial balance of the amount of the ionic surfactant of each polarity is shifted in advance in the aggregation process, and the first stage matrix is formed below the glass transition point of the resin. After forming and stabilizing the aggregated particles, as a second step, additionally mix a particle dispersion liquid treated with a surfactant having a polarity and an amount that compensates for the imbalance, and further, as needed, the base aggregated particles or additional particles. After slightly heating below the glass transition point of the resin contained in the particles and stabilizing at a higher temperature, the particles added in the second stage of aggregated particle formation by heating above the glass transition point are converted into the parent aggregated particles. Can be coalesced while still attached to the surface of the substrate. In addition, since these aggregation stepwise operations can be repeatedly performed a plurality of times, the composition and physical properties can be changed stepwise from the surface to the inside of the toner particles, and the control of the toner structure becomes extremely easy.

By forming only the resin layer on the surface of the color toner using the above method, not only the effect that the release agent does not appear on the surface even when a large amount of the release agent is used as described above, In addition, since the influence of the pigment particles on the charging behavior can be minimized, it is possible to prevent a difference in the charging characteristics depending on the type of the pigment from appearing. Further, if the glass transition point of the particles added in the second stage is set to be higher, the toner is coated with the resin in a capsule shape, and both the heat storage property and the fixing property can be achieved. When a dispersion of inorganic fine particles is used in the second step, toner particles having a structure in which capsules are covered with inorganic particles after coalescence can be produced. Alternatively, the second step is to add a release agent particle dispersion such as wax, and the third step is to form a shell on the outermost surface using a resin or inorganic particle dispersion having high hardness to suppress the exposure of the wax. However, at the time of fixing, the wax can effectively act as a release agent.

Further, by forming an aggregated structure on the surface in a stepwise manner, it is possible to maintain the particle size distribution during fusion and coalescence by heating at a high temperature after aggregation, and to suppress the fluctuation of the average particle size from the aggregated particle size. In addition, the addition of a surfactant or a stabilizer such as a base or an acid for improving the stability of these fusions can be eliminated or the amount can be suppressed to a minimum. The particle size of the dispersed particles is desirably 1 μm or less in both the particle dispersion used in the first stage and the dispersion used in the additional mixing step. The distribution of the diameter becomes wide, the generation of free particles occurs,
It is likely to cause a decrease in performance and reliability.

The amount of the particle dispersion to be additionally mixed depends on the volume fraction of the particles contained, and it is desirable that the amount of the additional particles be within 50% of the aggregated particles in the volume finally produced. If it is more than this, the composition distribution and the particle size distribution become remarkable due to the formation of newly aggregated particles instead of aggregation to the base particles, and desired performance cannot be obtained. Further, by adding the particles stepwise or gradually and continuously, it is possible to suppress the generation of new fine aggregated particles and sharpen the particle size distribution. Further, the generation of free particles can be suppressed by increasing the temperature within the range of the glass transition temperature of the parent aggregated particles or the additional particles at each stage of addition.

The release agent particle dispersion comprises at least a release agent,
After heating the mixture with the dispersion above the melting point of the release agent,
It is obtained by emulsifying using the following high-pressure type emulsifier, and then cooling to solidify the release agent fine particles. In addition to the release agent, a colorant, a charge control agent particle, an internally added particle, and the like may be added. As the emulsifier used for emulsification, a homogenizer or a disperser classified into a high-pressure type is used, and examples thereof include a Gaulin homogenizer, a microfluidizer, an ultimateizer, a pressure, and a homogenizer (Nippon Seiki). These emulsifiers may be combined with a plurality of emulsifiers and dispersers as pre-treatment or post-treatment. In the present invention, by using such a high-pressure type homogenizer, release agent particles having a volume average particle diameter of less than 0.5 μm could be obtained. The release agent particles used in the present invention preferably have a volume average particle diameter of preferably 0.4 μm or less and 0.8% or more of 5% or less.

Examples of the release agent include low molecular weight polyolefins, silicones, carboxylic esters,
Carboxamide, vegetable wax, animal wax,
Mineral and petroleum waxes and their modified products are included. In particular, paraffin-based wax and low-molecular-weight polyolefin-based wax are excellent in uniformity with other fine particles in the mixed liquid preparation step and the aggregated particle formation step, and are preferably used. In addition, carboxylic acid ester-based wax,
When a toner is prepared by using this, it can be suitably used because it exhibits characteristics excellent in OHP transparency.

[0023]

EXAMPLES In the following examples, the following volume GSD or several GSD can be simply used as an index of the particle size distribution using D16% and D84% of the cumulative distribution. Volume GSD = (volume D84 / volume D16) 0.5 power Number GSD = (number D84 / number D16) 0.5 power

(Preparation of Resin Dispersion 1) Styrene 370 g n-butyl acrylate 30 g Acrylic acid 6 g Dodecanethiol 24 g 4 Carbon bromide 4 g A mixture prepared by mixing and dissolving at least 4 g of nonionic surfactant Nonipol 400, 6 g of anionic surfactant Neogen SC
10 g was dissolved in 550 g of ion-exchanged water, dispersed and emulsified in a flask in a flask, and slowly mixed for 10 minutes, 50 g of ion-exchanged water in which 4 g of ammonium persulfate was dissolved was introduced, and nitrogen substitution was performed. Thereafter, the content was heated to 70 ° C. in an oil bath while stirring the flask, and emulsion polymerization was continued for 5 hours. This allows
Center diameter 155 nm, glass transition point 59 ° C, Mw 1200
0 was obtained.

(Production of Resin Dispersion 2) 280 g of styrene, 120 g of n-butyl acrylate, 8 g of acrylic acid, and a mixture of at least 8 g of the same were dissolved in 6 g of nonionic surfactant Nonipol 400 and anionic surfactant Neogen SC.
In a flask prepared by dissolving 12 g of ion-exchanged water in 550 g, dispersed and emulsified in a flask, and slowly mixed for 10 minutes, 50 g of ion-exchanged water in which 3 g of ammonium persulfate was dissolved was introduced to perform nitrogen substitution. Thereafter, the content was heated to 70 ° C. in an oil bath while stirring the flask, and emulsion polymerization was continued for 5 hours. This allows
An anionic resin dispersion having a center diameter of 105 nm, a glass transition point of 53 ° C., and Mw of 550,000 was obtained.

(Production of Colorant Dispersion) Copper Phthalocyanine Pigment PV FAST BLUE (BASF) 20 g Anionic Surfactant Neogen SC 2 g Ion-exchanged water 78 g Mix above, and ultrasonic washing machine W- manufactured by Honda Electronics Co., Ltd. 11
The dispersion was dispersed at 28 in an oscillation frequency of 28 kHz for 10 minutes to obtain a colorant dispersion. When the particle size distribution of this sample was measured with a particle size analyzer LA-700 manufactured by Horiba, Ltd., the volume average particle size was 150 nm, and no coarse particles of 1 μm were observed.

(Production of Release Agent Dispersion 1) Paraffin wax HNP0190 (melting point: 85 ° C. Nippon Seiro) 200 g Anionic surfactant Neogen SC 10 g Ion-exchanged water 790 g Heat the above to 95 ° C.
After emulsification at a discharge pressure of 0 × 10 ⁵ N / m ² , the mixture was rapidly cooled,
A release agent dispersion was obtained. This sample was prepared by Horiba, Ltd.
When measured with a particle size analyzer LA-700, the volume average particle size was 160 nm, and coarse particles having a size of 0.8 μm or more were 5% or less.

(Production of Release Agent Dispersion 2) Polyester Wax 100P (Melting Point: 116 ° C., Mitsui Petrochemical Industry) 200 g Anionic surfactant Neogen SC 10 g Ion-exchanged water 790 g Heat above to 130 ° C.
After emulsification at a discharge pressure of 60 × 10 ⁵ N / m ² , the mixture was rapidly cooled to obtain a release agent dispersion. When this sample was measured with a particle size analyzer LA-700 manufactured by Horiba, Ltd., the volume average particle diameter was 162 nm, and the coarse particles having a size of 0.8 μm or more were 5% or less.

(Production of Release Agent Dispersion 3) Behenic acid ester wax EW861 (melting point: 60 ° C., Riken Kogyo) 200 g Anionic surfactant Neogen SC: 10 g Ion-exchanged water: 790 g
After emulsification at a discharge pressure of 0 × 10 ⁵ N / m ² , the mixture was rapidly cooled to obtain a release agent dispersion. When this sample was measured with a particle size analyzer LA-700 manufactured by Horiba, Ltd., the volume average particle size was 148 nm, and the coarse particles having a size of 0.8 μm or more were 5
% Or less.

(Production of Release Agent Dispersion 4) Polyester Wax 100P (Melting Point: 116 ° C., Mitsui Petrochemical Industry) 200 g Cationic Surfactant Sanizol B50 (Kao) 12 g Ion-exchanged water 788 g 5 with a homogenizer
After emulsification at a discharge pressure of 60 × 10 ⁵ N / m ² , the mixture was rapidly cooled to obtain a release agent dispersion. This sample was measured with a particle size analyzer LA-700 manufactured by Horiba, Ltd. to find that the volume average particle size was 210 nm, and the coarse particles having a size of 0.8 μm or more were 5% or less.

(Preparation of Control Release Agent Dispersion 1) A liquid having the composition of the above release agent dispersion 1 was heated to 95 ° C. and emulsified with a Gaulin homogenizer at a discharge pressure of 200 × 10 ⁵ N / m ² . Thereafter, the mixture was rapidly cooled to obtain a release agent dispersion. This sample was measured with a particle size analyzer LA-700 manufactured by Horiba, Ltd. to find that the volume average particle size was 398 nm, and the volume average particle size was 1.0%.
The size of coarse particles having a size of μm or more was 19%.

(Preparation of Control Release Agent Dispersion 2) A liquid having the composition of Release Agent Dispersion 1 was heated to 95 ° C. and emulsified with a Gaulin homogenizer at a discharge pressure of 50 × 10 ⁵ N / m ² . Thereafter, the mixture was quenched to obtain a release agent dispersion. This sample was measured with a particle size analyzer LA-700 manufactured by Horiba, Ltd. to find that the volume average particle size was 676 nm and 1.0 μm.
The above coarse particles were 29%.

(Preparation of Control Release Agent Dispersion 3) A solution having the composition of the above release agent dispersion 1 was heated to 95 ° C., and IK was used.
The mixture was emulsified in Ultra Turrax T50 manufactured by A for 10 minutes and then rapidly cooled to obtain a release agent dispersion. The volume average particle diameter of this sample was 9 μm as measured by a Horiba Seisakusho Co., Ltd. LA-700 particle size analyzer, and could not be dispersed to 1 μm or less.

Example 1 (Example of Claim 1) Resin dispersion liquid 1 180 g Resin dispersion liquid 2 80 g Colorant dispersion liquid 30 g Release agent dispersion liquid 1 30 g Sanisol B50 1.5 g After mixing and dispersing with a Turrax T50, the flask was heated to 50 ° C. while stirring in a heating oil bath. After holding at 50 ° C. for 1 hour, observation with an optical microscope confirmed that aggregated particles of about 5.9 μm had been formed. Then, after adding 3 g of Neogen SC, the stainless steel flask was sealed, heated to 105 ° C. while continuing to stir using a magnetic seal, and held for 3 hours. After cooling, the mixture was filtered, sufficiently washed with ion-exchanged water, and the particle size was measured with a Coulter counter to find that it was 6.0 μm. The volume GSD, which is an index of the volume particle size distribution, was 1.21. When the cross section of the toner was observed with a transmission electron microscope, the degree of dispersion of the release agent was good and no structural deviation was observed. When the surface state was observed with a scanning electron microscope, the exposure of the pigment and the wax-like substance to the toner surface was observed, but no release was observed. When fixing was evaluated by rubbing with a rag using a fastness tester using a modified Fuji Xerox V500, sufficient fixing properties were exhibited at a heat roll temperature of 130 ° C., and no offset was observed up to 220 ° C.
The toner was fixed on an OHP with a modified Fuji Xerox AColor, and the HAZE value was measured.

Example 2 (Example of Claim 2) Resin dispersion liquid 1 120 g Resin dispersion liquid 2 80 g Colorant dispersion liquid 30 g Release agent dispersion liquid 2 30 g Sanisol B50 1.5 g After mixing and dispersing with a Turrax T50, the flask was heated to 48 ° C. while stirring in a heating oil bath. After holding at 48 ° C. for 30 minutes, observation with an optical microscope confirmed that aggregated particles of about 5 μm had been formed. Here, 60 g of the resin dispersion liquid 1 was slowly added, and the temperature of the oil bath for heating was further increased and maintained at 50 ° C. for 1 hour. Observation with an optical microscope confirmed that aggregated particles of about 5.6 μm had been formed. After that, here 3g of Neogen SC
Was added, the stainless steel flask was sealed, and heated to 105 ° C. while continuing stirring using a magnetic seal,
Hold for 3 hours. After cooling, the mixture is filtered, washed sufficiently with ion-exchanged water, and the particle size is measured using a coulter counter.
It was 8 μm. Volume GSD which is an index of volume particle size distribution
Was 1.23. When the cross section of the toner was observed with a transmission electron microscope, the degree of dispersion of the release agent was good. When the surface state was observed with a scanning electron microscope, the exposure of the wax-like substance to the toner surface was slight, and no release was observed. Fuji Xerox V500 remodeling machine, the robustness tester was evaluated for fixing by rubbing with waste cloth.
Sufficient fixability was exhibited at a heat roll temperature of 35 ° C, and no offset was observed up to 210 ° C. Established on OHP with Fuji Xerox AColor remodeling machine, HAZ
When the E value was measured, it showed a sufficient transparency of 14%.

Example 3 A toner was prepared under the same conditions as in Example 2, except that the amount of the release agent dispersion liquid 2 was increased from 30 g to 200 g, and the amount of sanizole was 1.8 g. Final particle size is 6.5 μm, volume GSD
Was 1.28. When the cross section of the toner was observed with a transmission electron microscope, it was observed that a considerable amount of the release agent was internally added. Observation of the surface state with a scanning electron microscope revealed that the wax-like substance was exposed to the toner surface but was slight. Fuji Xerox V500 remodeling machine, 130%
Showed sufficient fixability at the heat roll temperature, and no offset was observed up to 180 ° C. It was fixed on an OHP with a modified Fuji Xerox AColor, and the HAZE value was measured.

Example 4 An experiment was conducted in the same manner as in Example 3 except that the release agent dispersion 2 of Example 3 was replaced with the release agent dispersion 3, and the final particle size was 6.3 μm.
m and toner particles having a volume GSD of 1.27 were obtained. When the cross section of the toner was observed with a transmission electron microscope, it was observed that a considerable amount of the release agent was internally added. Observation of the surface state with a scanning electron microscope revealed that no wax-like substance was exposed on the toner surface. When fixing was evaluated by rubbing with a rag using a fastness tester using a modified Fuji Xerox V500, sufficient fixing properties were exhibited at a heat roll temperature of 130 ° C., and no offset was observed up to 190 ° C.
The toner was fixed on an OHP with a modified Fuji Xerox AColor, and the HAZE value was measured.

Example 5 An experiment was carried out in the same manner as in Example 2 except that the release agent dispersion 2 of Example 2 was replaced with the release agent dispersion 4, and the final particle size was 6.0.
Toner particles having a volume GSD of 1.22 μm were obtained. When the cross section of the toner was observed with a transmission electron microscope, it was observed that a considerable amount of the release agent was internally added. Observation of the surface state with a scanning electron microscope revealed that no wax-like substance was exposed on the toner surface. Fuji Xerox V500
When the fixation was evaluated by rubbing with a rag using a remodeled machine, a sufficient fixability was exhibited at a heat roll temperature of 140 ° C., and no offset was observed up to 210 ° C. It was fixed on an OHP with a modified Fuji Xerox AColor, and the HAZE value was measured.

Comparative Example 1 A toner was prepared in the same manner as in Example 1 except that Control Release Agent Dispersion 1 was used as the release agent dispersion. Final particle size is 6.1 μm
And the volume GSD was 1.25, but the filtrate after filtering the toner slurry was slightly cloudy and the release agent was released. When the cross section of the toner was observed with a transmission electron microscope, it was observed that the release agent was internally added. However, when the surface state was observed with a scanning electron microscope, the wax-like material was exposed on the toner surface. Was done. Fuji Xerox V5
When the fixation was evaluated by rubbing with a waste tester using a modified model 00, sufficient fixability was exhibited at a heat roll temperature of 130 ° C., but offset occurred at 165 ° C. Established on OHP with Fuji Xerox AColor remodeling machine,
When the AZE value was measured, the transparency was insufficient at 21%.

Comparative Example 2 A toner was prepared in the same manner as in Example 1, except that Control Release Agent Dispersion Liquid 2 was used as the release agent dispersion liquid. Final particle size is 6.0 μm
The volume GSD was 1.30, and the filtrate after filtering the toner slurry was cloudy and the release agent was released.
When the cross section of the toner was observed with a transmission electron microscope, a part of the release agent was exposed on the surface. When the surface state was observed with a scanning electron microscope, exposure of the wax-like substance to the toner surface was observed, and some of the wax-like substances were separated. When the fixing was evaluated by rubbing with a waste tester using a modified Fuji Xerox V500, a sufficient fixing property was exhibited at a heat roll temperature of 130 ° C., but an offset occurred at 155 ° C. When fixed on OHP with a modified Fuji Xerox AColor machine, and the HAZE value was measured, the transparency was insufficient at 23%.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shuji Sato 1600 Takematsu, Minami Ashigara City, Kanagawa Prefecture Inside Fuji Xerox Co., Ltd. (72) Inventor Yasuo Kadokura 1600 Takematsu, Minami Ashigara City, Kanagawa Prefecture Inside Fuji Xerox Co., Ltd. (72) Inventor Hisao Morojiri 1600 Takematsu, Minami Ashigara City, Kanagawa Prefecture Inside Fuji Xerox Co., Ltd. (72) Inventor Takeshi Shoko 1600 Takematsu Minami Ashigara City, Kanagawa Prefecture Inside Fuji Xerox Co., Ltd. 1600 Fuji Xerox Co., Ltd. (72) Inventor Junichi Tomonaga 1600 Takematsu, Minami Ashigara City, Kanagawa Prefecture Fuji Xerox Co., Ltd. (72) Koichi Sugiyama 1600 Takematsu, Minami Ashigara City, Kanagawa Prefecture Fuji Xerox Co., Ltd.

Claims (12)

[Claims] 1. A resin particle dispersion in which at least resin particles are dispersed, a colorant particle dispersion in which at least colorant particles are dispersed, and a release agent particle dispersion in which at least release agent particles are dispersed. A step of mixing, a step of aggregating these particles, and a method of producing a toner for electrostatic image development including a step of heating and fusing the aggregated particles,
The release agent particles of the release agent particle dispersion have a volume average particle size of less than 0.5 μm and particles having a volume average particle size of 1.0 μm or more.
% Of the toner for developing an electrostatic image. 2. The release agent particles of the release agent particle dispersion have a volume average particle diameter of 0.4 μm or less, and particles of 0.8 μm or more are 5% or less. 2. The method for producing a toner for developing an electrostatic image according to item 1. 3. The method according to claim 1, further comprising, after the step of aggregating the particles and before the step of fusing, at least one step of additionally mixing the particle dispersion. A method for producing an electrostatic image developing toner. 4. The method for producing a toner for developing an electrostatic image according to claim 3, wherein the particles to be additionally mixed are 50% or less of the volume of the obtained toner particles. 5. The method for producing a toner for developing an electrostatic image according to claim 1, wherein the resin particle dispersion contains a plurality of resin particles having different molecular weights. 6. The method for producing a toner for developing an electrostatic image according to claim 1, wherein the toner particles contain a release agent in an amount of 1 to 50% by weight. 7. The method according to claim 1, wherein the release agent is selected from the group consisting of paraffin wax, polyolefin wax and carboxylic acid wax. 8. The release agent particle dispersion, wherein the release agent particles are dispersed by a dispersant selected from the group consisting of an anionic surfactant, a cationic surfactant and an amphoteric surfactant. A method for producing the electrostatic image developing toner according to claim 1. 9. A release agent particle dispersion, wherein a dispersion slurry containing at least a release agent and a dispersant is heated to a temperature equal to or higher than the glass transition temperature of the release agent, and emulsified by high pressure discharge collision or discharge impact. 2. The method according to claim 1, wherein the toner is obtained by cooling. 10. A toner produced by the production method according to claim 1. 11. An electrostatic image developer including an electrophotographic carrier and an electrostatic image developing toner, wherein the electrostatic image developing toner is manufactured by the manufacturing method according to any one of claims 1 to 9. An electrostatic image developer, which is an electrostatic image developing toner. 12. A step of forming an electrostatic latent image on an electrostatic latent image carrier, a step of developing the electrostatic latent image with a developer layer on a developer carrier, and forming a toner image. 10. An image forming method including a transfer step of transferring a toner image onto a transfer member, wherein a developer of the developer layer is a developer.
An image forming method, comprising the electrostatic image developing toner manufactured by the manufacturing method according to any one of the above.