JPH04307555A - Method for manufacturing photoconductive toner - Google Patents

Abstract

PURPOSE:To easily produce a toner contg. a photoconductive agent and a functional property imparting agent in the shell layer and having a tough coating film of a controlled thickness at a stroke without passing through a complex process. CONSTITUTION:At least fine resin particles, a photoconductive agent and a functional property imparting agent are stuck on the surfaces of core particles, the core particles are treated with a solvent dissolving the fine resin particles and the treated particles are dried and recovered. The resulting toner has superior electrophotographic characteristics such as electrostatic chargeability and flowability, ensures stable quality and gives a clear image by a simple low-cost process.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing photoconductive toner for use in image forming apparatuses such as printers, copying machines, and facsimile machines. More specifically, the present invention relates to a method for producing a photoconductive toner for use in a simple image forming apparatus that does not use a photoreceptor.

0002

[Prior Art] Conventionally, image forming methods using photoconductive toner use a photoreceptor and insulating or conductive toner.
Compared to electrophotographic methods that form images using electrostatic force,
Many proposals have been made to date, such as the Sugarman method (US Pat. No. 2,758,939), because it has advantages such as not using a photoreceptor, being able to perform exposure and development at the same time, and easily producing color. In addition, many proposals have been made regarding photoconductive toners as well as image forming methods. In general, photoconductive toners have a single structure in which a photoconductive agent is dispersed in a thermoplastic resin like normal toners, and others have a single structure in which a photoconductive agent is dispersed in a thermoplastic resin. There are two types of multilayer structures coated with photoconductive layers: Manufacturing methods include a kneading and pulverizing method, a spray drying method, and a microcapsule method. Recently, in JP-A-60-133459, a dispersion of a photoconductive agent dispersed in an aqueous solution and a dispersion of a thermoplastic resin dispersed in an aqueous solution are mixed and dried by a spray drying method to obtain a photoconductive toner. A method is disclosed in which a photoconductive toner is obtained by crushing and classifying the agglomerates by air drying. Furthermore, in JP-A-60-175056, a photoconductive agent and fine polymer particles are mixed with core particles made of a spherical transparent polymer, uniformly dispersed, and spray-dried at a temperature above the glass transition point of the fine polymer particles. A method is disclosed in which a coating layer made of a mixture of a polymer and a photoconductive agent is formed on the surface of a spherical and transparent core particle. Furthermore, in JP-A-61-6657, a thermoplastic resin is added as a main component to a mixed solution obtained by mixing a dispersion in which a photoconductive agent is dispersed and a dispersion in which thermoplastic resin particles serving as a binder material are dispersed. The mixed solution is applied to the core by mixing and dispersing the core. A method for producing a photoconductive toner having a two-layer structure in which a photoconductive agent is retained by thermoplastic resin particles by drying this core by a spray drying method or the like is disclosed.

0003

However, in the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 133459/1983, the preparation of the photoconductive agent and thermoplastic resin dispersion is complicated and stable manufacturing cannot be carried out. Furthermore, the need for uniform dispersion narrows the range of material selection and limits the ability to improve the properties of the photoconductive toner. Further, because of the single-layer structure, there is a problem that a photoconductive toner that satisfies both photoconductive properties and fixing properties cannot be obtained. Also, JP-A-60-175056 and 61-665
Similarly, in the production method No. 7, the production of the core particles, the production and dispersion of the coating resin fine particles, and the dispersion of the photoconductive agent are complicated, and stable production cannot be performed. Furthermore, since the dispersion liquid is dried by a spray drying method or the like, the particle size distribution is broad and a classification operation is required. Furthermore, the fine resin particles attached to the surface of the core have a weak adhesion force and are easily peeled off.

Therefore, the object of the present invention is to solve the above problems, and the object thereof is to provide a photoconductive layer with strong adhesion, to achieve both photoconductive properties and fixing properties, and to provide stable quality light. An object of the present invention is to provide a conductive toner. A further object of the present invention is to provide a method for producing a photoconductive toner that satisfies electrophotographic properties such as fluidity and chargeability without complicating the production process.

[0005]

[Means for Solving the Problems] The method for producing a photoconductive toner of the present invention is a method for producing a microcapsule type photoconductive toner containing a photoconductive agent as a constituent of the coating layer. It is characterized by comprising the steps of attaching a photoconductive agent and a functionalizing agent, treating the resin fine particles with a solvent that dissolves them, and drying and collecting the treated particles.

[0006] Furthermore, it is characterized in that a charge control agent and a fluidity improver are used as the functionality imparting agent.

[0007]

[Effect] By mixing large-sized mother particles and small-sized child particles and processing them through mechanochemical reactions, the child particles have electrostatic force, chemical adsorption force, etc. on the surface of the mother particle.
It adheres uniformly over the entire surface of the base particle due to physical adsorption force, etc. When fine resin particles are attached as child particles, the resin is dissolved by bringing a solvent that dissolves the resin particles into contact with the fine resin particles, and a film made of the resin component is formed on the surface of the mother particle. The coating state at this time can be controlled by controlling the type of solvent and the contact time. Further, the solvent that has been brought into contact with the particles can be quickly evaporated and removed from the particles by heat and air current, thereby preventing agglomeration of the particles.

[0008] If the production method is followed by mixing a photoconductive agent (hereinafter referred to as photoconductive particles) with the child particles during the mechanochemical reaction, the photoconductive particles will be firmly fixed to the surface of the mother particles by the resin. , and a coating layer in which photoconductive particles are dispersed in the resin is formed. In this way, since a photoconductive layer containing resin as the main component is formed on the surface of the inner core particles, the inner core particles are not affected by solvents, and even when the inner core particles are softer than fine particles with a lower softening point, the photoconductive layer can be reliably formed.

The above-mentioned toner has electrophotographic properties because a strong photoconductive layer is formed and peeling does not occur, and the surface is coated with a resin and contains functionality imparting agents such as a charge control agent and a fluidity improver. control has also become easier. When images are formed using the photoconductive toner of the present invention, clear images can be formed with a simple process.

The present invention will be explained in detail below based on the drawings, but it goes without saying that the present invention is not limited thereto.

[0011]

[Example] Figure 1 shows a cross-sectional view of the photoconductive toner of the present invention.
Further, FIG. 2 shows a flowchart of the method for manufacturing the photoconductive toner of the present invention. Toner inner core 1 contains binder resin 2 and colorant 3
, a mold release agent, magnetic powder, etc., and these core particles have a particle size of 1 to 40 μm and are prepared by a general kneading and pulverization method, spray drying method, or polymerization method. The shape may be spherical or irregular.

The composition of the binder resin is not particularly limited, and common binder resins can be used. As the binder resin 2, polystyrene and copolymers thereof include hydrogenated styrene resin, styrene/isobutylene copolymer, ABS resin, ASA resin, AS resin, AAS resin, ACS resin, AES resin, styrene/p-chloro Styrene copolymer, styrene/propylene copolymer, styrene/butadiene crosslinked polymer, styrene/butadiene/
Chlorinated paraffin copolymer, styrene/allyl/alcohol copolymer, styrene/butadiene rubber emulsion, styrene/maleate ester copolymer, styrene/allyl alcohol copolymer,
There are isobutylene copolymers, styrene/maleic anhydride copolymers, etc., as well as acrylate resins or methacrylate resins and their copolymers, and styrene/acrylic resins and their copolymers. Acrylic copolymer, styrene/diethylamino/ethyl methacrylate copolymer, styrene/butadiene/acrylic ester copolymer, styrene/methyl methacrylate copolymer, styrene/n-butyl methacrylate copolymer, styrene/diethylamino・Ethyl methacrylate copolymer, styrene/methyl methacrylate/n-butyl acrylate copolymer, styrene/methyl methacrylate/butyl arylate/N
-(Ethoxymethyl)acrylamide copolymer, styrene/glycidyl methacrylate copolymer, styrene/
Butadiene/dimethyl/aminoethyl methacrylate copolymer, styrene/acrylic acid ester/maleic ester copolymer, styrene/methyl methacrylate/
2-ethylhexyl acrylate copolymer, styrene
n-butyl arylate/ethyl glycol methacrylate copolymer, styrene/n-butyl methacrylate/acrylic acid copolymer, styrene/n-butyl methacrylate/maleic anhydride copolymer, styrene/butyl acrylate/isobutyl maleic acid Half ester
There are divinylbenzene copolymers, polyester and its copolymers, polyethylene and its copolymers, epoxy resins, silicone resins, polypropylene and its copolymers, fluorocarbon resins, polyamide resins, polyvinyl alcohol resins, polyurethane resins, There are polyvinyl butyral resins and the like, and one type or a mixture of two or more types of these can be used as required. Also, wax or the like can be used as a substance other than resin. For more information, please see plant-based natural waxes such as candelilla wax, carnauba wax, and rice wax, animal-based natural waxes such as beeswax and lanolin, mineral-based natural waxes such as montan wax and ozokerite, and natural waxes such as paraffin wax, microcrystalline wax, and petrolatum. Petroleum waxes, polyethylene waxes, synthetic hydrocarbon waxes such as Fischer-Tropsch waxes, modified waxes such as montan wax derivatives and paraffin wax derivatives, hydrogenated waxes such as hydrogenated castor oil and hydrogenated castor oil derivatives, waxes such as synthetic waxes, and stearin. acids, higher fatty acids such as palmitic acid, low molecular weight polyethylene, oxidized polyethylene,
These include polyolefins such as polypropylene, olefin copolymers such as ethylene/acrylic acid copolymers, ethylene/acrylic ester copolymers, and ethylene/vinyl acetate copolymers, and one or two types of these may be used as needed. The above can be used.

As the coloring agent 3, black dyes/pigments such as carbon black, spirit black, copper oxide, manganese dioxide, aniline black, activated carbon, and nigrosine are used. For color use, yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral fast yellow, nickel titanium yellow, navels yellow, naphthol yellow S, banzer yellow G, banzer yellow 10G, benzidine yellow G, benzidine yellow G
R, quinoline yellow lake, tartrazine lake, permanent yellow NCG, red yellow lead, molybdenum orange, pyrazolone orange, permanent orange GT
R, Vulcan Orange, Indus Thlen Brilliant Orange RK, Indus Thlen Brilliant Orange GK, Benzidine Orange G, Red Red, Cadmium Red, Red Lead, Mercury Sulfide, Cadmium, Permanent Red 4R,
Lysole Red, Pyrazolone Red, Lake Red D,
Brilliant Carmine 6B, Brilliant Carmine 3B
, Eosin Lake, Rhodamine Lake B, Alizarin Lake, Manganese Purple, Fast Violet B, Methyl Violet Lake, Cobalt Blue, Alkaline Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Fast Sky Blue, Industhrene Blue BC,
Pigment Green B, Malachite Green Lake, Final Yellow Green G, Zinc White, Titanium Oxide, Zinc Sulfide, Phthalocyanine, Rhodamine B Lake, Solar Pure Yellow 8G, Quinacridone, Polytungstophosphoric Acid, Methylene Blue, Rose Bengal, Sulfonamide Derivatives, etc. However, if necessary, one type or a mixture of two or more types can be used.

As the release agent, waxes, particularly polyethylene and polypropylene wax, can be used to prevent offset to the heat roller.

[0015] As magnetic powder, Fe3O4, Fe2O3
, Fe, Cr, Ni, etc. are used.

[0016] In addition to this, metal soaps,
Polyethylene glycol and the like can be added as necessary.

The coating layer 4 comprises a binder resin, photoconductive particles 5, and, if necessary, a charge control agent 6 and a fluidizing agent 7.

As the binder resin fine particles, polymethyl methacrylate (PMMA), polyethyl methacrylate (PEMA), poly-n-butyl methacrylate (
PBMA), polyester, styrene-butadiene copolymer, polyvinyl chloride (PVC), polyvinyl alcohol (PVA), polyvinyl acetate (PVAc), poly-γ
-Methyl-glutamate, fluororesin, vinylidene fluoride resin, benzoquanamine resin, silicone resin, epoxy resin, nylon 66/6, nylon 11, nylon 12, polystyrene resin, crosslinked polystyrene resin, phenolic resin, melamine resin, polyolefin resin, polyethylene Resin, cellulose, etc. can be used.

The photoconductive particles 5 are not particularly limited, and include zinc oxide, titanium oxide, phthalocyanine pigments, quinacridone pigments, benzidine, dioxane pigments, benzimidazole pigments, cyanine dyes, and azo pigments. , indigoid pigments, anthraquinone pigments,
Perylene pigments etc. can be used. Also zinc oxide,
Inorganic photoconductive particles such as titanium oxide are prepared by adsorbing a sensitizing dye to the photoconductive particles so that they are sensitive to any wavelength. The particle size of the photoconductive particles is
Considering the dispersibility within the photoconductive layer, it is 10 nm to 0.5 μm.
A range of is preferred.

As the charge control agent 6 (hereinafter referred to as CCA), an electron-accepting organic complex, chlorinated polyester, nitrofnic acid, quaternary ammonium salt, pyridinyl salt, etc. can be added.

[0021] As the fluidizing agent 7, Si02, TiO2 (
rutile, anatase), Zn0, Al2O3 (α type, β
type), TiON, TiBaO3, MgO, ZrO2, C
aCO3, NiO, SnO, clay, talc, silica sand,
Fine particles of mica, SiN, SiC, Ba2SO4, carbon black, etc. are used. These CCA 6 and fluidizing agent 7 may be contained not only in the coating layer 4 but also in the inner core particle 1.

Next, a toner manufacturing method will be described according to the flowchart of FIG.

Inner core particles 1 are produced by a kneading and pulverizing method, a spray drying method, a polymerization method, etc. using raw materials consisting of a binder resin 2, a coloring agent 3, and the like. Next, an external addition process 8 is performed to attach resin fine particles, photoconductive particles 5, and a functional agent to the inner core particles 1, thereby producing inner core particles to which resin and photoconductive particles are externally added. Next, a coating treatment 9 is performed by bringing the resin and the core particles externally added to the photoconductive particles into contact with a solvent that dissolves the resin particles, thereby producing a photoconductive toner 10. The thickness of the photoconductive layer depends on the optical transparency,
In consideration of fixing properties, a range of 1 to 3 μm is preferable.

[0024] Possible methods for externally adding fine particles to the surface of the inner core particles include wet methods such as spray drying, interfacial precipitation, heterocoagulation, and wet milling, and dry methods such as mechanochemical methods.

[0025] In the case of a dry method, a conventional mixer such as a ball mill or a V-type mixer can be used, but it is preferable to use a so-called high-speed fluidized stirrer. As the high-speed fluidized stirrer, a so-called Henschel mixer, Mechano Fusion System (Hosokawa Micron), Nara Hybridization System (Nara Kikai Seisakusho), Mechano Mill (Okada Seiko), etc. are used. However, the device for fixing fine particles to the surface of the inner core particles is by no means limited to these.

Methods for treating with a solvent include spray drying and immersion, but any method may be used as long as the contact time can be controlled. Preferably, a powder coating device such as Dispercoat (Nissin Seifun) or Coatmizer (Freund Sangyo) is used.

The solvent used to treat the inner core particles with fine resin particles attached to their surfaces is determined depending on the materials of the inner core particles and the fine particles. For this reason, water-based, organic solvent-based, etc. can be used. For example, organic solvents include halogenated hydrocarbons such as dichloromethane, chloroform, carbon tetrachloride, dichloroethane, and chlorobenzene, alcohols such as methanol, methyl cellosolve, and benzyl alcohol, and ethers such as dioxane, tetrahydrofuran, and benzyl ether. Esters such as ethyl acetate and butyl acetate, ketones such as furfural, acetone, methyl ethyl ketone, and cyclohexane, aromatics such as benzene, toluene, and xylene, and nitrogen compounds such as nitrobenzene, acetonitrile, diethylamine, aniline, dimethylformamide, and pyrrolidone. Can be used.

[0028] By using the raw materials described above and forming a resin coating layer containing photoconductive particles on the surface of the inner core particles by the method described above, fluidity can be easily improved without the need for operations such as classification after treatment. It is also possible to produce photoconductive toners that satisfy various electrophotographic properties.

This embodiment will be explained in more detail below.

[Example 1] <Preparation of inner core particles> Styrene-acrylic copolymer 90 parts by weight carbon black
Using 10 parts by weight of raw materials having the above composition, they are kneaded using a twin-screw extruder, cooled and coarsely pulverized. Next, after finely pulverizing with a jet pulverizer, it is classified to have an average particle size of 10 μm and a distribution of 5 to 2.
A 5 μm inner core particle was prepared.

<Formation of photoconductive layer> (External addition of photoconductive particles, resin fine particles, and functional agent) The photoconductive layer is made of polybutyl methacrylate (PBMA) resin fine particles as thermoplastic resin fine particles and zinc oxide adsorbed with a dye. It was formed by externally adding powder (ZnO) and a functional agent. The particle sizes of PBMA and ZnO used were both 0.4 μm. The composition is shown below.

PBMA fine particles 20 parts by weight Dye-adsorbed ZnO 76 parts by weight CCA
2 parts by weight SiO2
2 parts by weight of these were mixed with the above-mentioned inner core particles in the composition shown below, and external addition treatment was performed.

Inner core particles: 20 parts by weight Externally added fine particles: 80
Part by Weight These raw materials were mixed and externally added to the surface of the inner core particles using a Mechano Fusion System (manufactured by Hosokawa Micron) (hereinafter referred to as Mechano treatment). As a mechano condition,
The rotation speed was 1500 rpm and the processing time was 30 minutes. Excess fine particles that did not contribute to adhesion of the obtained powder particles were removed using a classifier. (Removal of excess particles using a classifier can be omitted by adjusting the amount of externally added fine particles.) However, even after removal, PBMA particles, dye-adsorbed ZnO particles, and functional agents remain on the surface of the inner core particles. Electron microscopic observation of the surface revealed that it was not peeled off and was still attached. In addition, cross-sectional observation using an electron microscope revealed that PBMA particles and dye-adsorbed ZnO were found on the surface of the inner core particles.
It was observed that the particles and the functional agent remained spherical and formed a coating layer.

[0034] Further, dye adsorption onto zinc oxide was carried out by the following method.

ZnO powder 10
Part by weight Malachite green 0.01 part by weight Rose Bengal 0.01 part by weight Phthalic anhydride 0.01 part by weight Ethyl alcohol 20 parts by weight The above raw materials are dispersed for 1 hour using an ultrasonic disperser. Thereafter, ethyl alcohol was evaporated to dryness, and the dye was adsorbed onto the ZnO particles for sensitization.

(Solvent Treatment) The inner core particles produced by the above method were subjected to solvent treatment using a powder coating device. Acetone, which dissolves PBMA particles, was used as a solvent.

Here, the conveyance amount of each component is 1 for both powder and solvent.
The air flow pressure, powder, and solvent supply amounts were adjusted so that the amount was 1 kg/hr. After these were brought into contact and mixed, the mixture was spray-dried, and the resulting toner was collected using a cyclone.

[0038] The particles obtained by this solvent treatment had no binding between particles, and each particle was an aggregate in an independent state. In addition, when the cross-section of the particles produced in this example was observed using an electron microscope, it was found that about 1μ
m coating layer is formed, and the coating layer contains CCA,
The presence of microparticles believed to be SiO2 was confirmed.

Further, the photoconductive toner produced by this method has a dark specific resistance of 1015 Ωcm and a light specific resistance of 107 Ωc.
It was m. The photosensitivity at this time was 10erg/cm2.

<Image Formation> Next, an image was formed using the photoconductive toner prepared in this example. First, a photoconductive toner is mixed with a conductive magnetic carrier to form a magnetic brush. This magnetic brush is brought into contact with a transparent insulating substrate. Next, image exposure is performed from the opposite side of this contact area, and at the same time a bias voltage is applied to inject a charge of opposite polarity to the charge held in the irradiated photoconductive toner to form a photoconductive toner. selectively attach. A liquid crystal shutter was used as a writing light source. Next, the photoconductive toner on this insulating substrate was transferred to plain paper by electrostatic transfer, and fixed using a heat fixing roller. As a result, the obtained images showed good fixing properties without causing blocking or caking during development, and O. D. It was confirmed that the image was clear with no background fog with a value of 1.5. Furthermore, after conducting a durability test of 30,000 sheets, it was possible to obtain clear images similar to the initial image without causing blocking or caking. In addition, the photoconductive toner produced in this example was sealed in a container and stored in an environment of 30°C - 80% for 3 months and a similar test was conducted, but there was no deterioration in properties such as aggregation. I was able to obtain a clear image similar to the initial one. The same thing happened in the durability test. This result shows that the properties as a photoconductive toner were fully exhibited, and that various electrophotographic properties and fixability on plain paper were as originally designed.

[0041] As a result, it has become possible to produce a microcapsule type photoconductive toner that can maintain sufficient toner properties such as fluidity and chargeability without post-processing.

[Example 2] Multi-stage mechano processing of inner core particles is possible. In this example, first, dye-adsorbed ZnO
Fine particles were laminated, then resin fine particles were attached, and then a functional agent was attached to form a multilayer structure consisting of uniform layers. The powder particles were subjected to solvent treatment using acetone to produce microcapsule toner. Since the dye-adsorbed ZnO particles are insoluble in acetone, cross-sectional observation revealed that the dye-adsorbed ZnO particles were covered with a resin layer to guard them. Furthermore, the presence of fine particles thought to be functional agents was also confirmed in the outer shell.

When a printing test was conducted using the toner prepared above, a good image was formed without any image disturbance. Furthermore, even in repeated tests, almost no image staining was observed.

[Example 3] Since the toner production method of the present invention allows encapsulation with a solvent, even low-melting point materials can be used as the inner core particles. In this example, the following materials and compositions were used as the inner core material.

Paraffin wax
29 parts by weight polyethylene wax
29 parts by weight Fe3O4
40 parts by weight Carbon black 2 parts by weight The above materials are kneaded using a twin-screw extruder, cooled and coarsely pulverized. Next, the mixture was finely pulverized using a jet pulverizer, and then classified to produce inner core particles with an average particle diameter of 10 μm and a distribution of 5 to 25 μm. The process of externally adding fine particles was the same as in Example 1. However, the mechano conditions are: rotation speed 800 rpm, processing time 15
It was carried out under the following conditions. As in Example 1, the obtained particles had no binding between the particles and were an aggregate of independent particles.

When an image was formed using the toner prepared above, a clear image was obtained with good reproducibility. Further, this electrophotographic toner did not aggregate even when left in a constant temperature and humidity chamber at a temperature of 50° C. and a humidity of 60% for 10 days, and there was no change in charging characteristics. These results demonstrate that the toner of the present invention is functioning as originally designed.

[Example 4] Using the same apparatus and inner core particles as in Example 1, the thickness of the coating layer was controlled by changing the particle size of the fine particles externally added to the inner core particles. The resin fine particles have a particle size of 0.4 μm (PBMA) and a particle size of 0.8 μm (PMMA).
, particle size of 1.0 μm (PMMA) was used. Table 1 shows the conditions for external addition of fine particles. All treatments were performed for 30 minutes. Next, these particles were treated with a solvent in the same manner as in Example 1. Acetone was used as the solvent. As in Example 1, the particle surface and cross section of the obtained particles were observed using an electron microscope, and the film thickness was measured. Table 2 shows the processing conditions and results. By changing the particle size of the particles attached to the surface of the inner core particles in this manner, a photoconductive layer having an arbitrary thickness can be formed.

[0048]

[Table 1]

[0049]

[Table 2]

[Example 5] Cyan, magenta, and yellow color photoconductive toners were produced by the same manufacturing method as in Example 1. The composition is shown in Tables 3, 4 and 5.

[0051]

[Table 3]

[0052]

[Table 4]

[0053]

[Table 5]

The three-color photoconductive toner prepared with the above composition has excellent electrophotographic properties such as fluidity and storage stability.Furthermore, when a color image was formed using the same image forming method as in Example 1, it showed no fixation. It was possible to form a color image with excellent color reproduction and color reproducibility.

Although the examples of the present invention have been shown above, the method for producing a photoconductive toner of the present invention is not limited to these examples, and can be applied to any structure in which a photoconductive agent is added to the coating layer. It is possible to apply this method to toner.

[0056]

Effects of the Invention As described above, according to the method for producing a photoconductive toner of the present invention, there is a step of attaching at least fine resin particles, a photoconductive agent, and a functionalizing agent to the surface of the inner core particles, and a step of dissolving the fine resin particles. The process consists of a process of treating the toner with a solvent, and a process of drying and collecting the treated particles.Furthermore, by using a charge control agent and a fluidity improver as functional agents, it is possible to achieve uniform and strong adhesion over the entire circumference of the toner. It has become possible to easily produce a toner that has adhesive strength and has a coating layer containing a photoconductive agent and a functional agent. This provides sufficient photoresponsiveness and plain paper fixing properties, as well as fluidity and
It has now become possible to provide a photoconductive toner that has excellent electrophotographic properties such as chargeability and does not change over time.

The photoconductive toner according to the present invention can be used in copying machines and
Applicable to fax machines, printers, etc., if the photoconductive toner production method of the present invention is used, the toner has good electrophotographic properties and long-term storage stability, and stable printing quality is possible during repeated image formation. This has the great effect of making it possible to easily produce toner with high reliability and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a cross-sectional structure of the toner of the present invention.

FIG. 2 is a flowchart showing an example of the toner manufacturing method of the present invention.

[Explanation of symbols]

1 Inner core particle 2 Binder resin 3 Coloring agent 4 Coating layer 5 Photoconductive agent 6 Charge control agent 7. Fluidizer 8 External addition treatment 9 Filming treatment 10 Photoconductive toner

Claims (2)

[Claims] Claim 1. A method for producing a microcapsule type photoconductive toner comprising a photoconductive agent as a constituent of the coating layer,
A light source characterized by comprising the steps of attaching at least resin fine particles, a photoconductive agent, and a functional agent to the surface of the inner core particles, treating the resin fine particles with a solvent that dissolves them, and drying and collecting the treated particles. Method for manufacturing conductive toner. 2. The method for producing a photoconductive toner according to claim 1, wherein a charge control agent and a fluidity improver are used as the functionality imparting agent.