JPH0561239A - Color toner for developing electrostatic charge image - Google Patents

Abstract

PURPOSE:To provide a color toner for developing an electrostatic charge image capable of giving a full-color image having excellent quality by fixing without coating with oil. CONSTITUTION:This color toner for developing an electrostatic charge image contains at least a binding resin, a colorant and a releasing agent and further contains a substance represented by the formula [where -(CH2-CH2-)n is long chain alkylene] by 0.01-10wt.% of the amt. of the releasing agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic charge image developing color toner used for electrophotographic full-color image formation.

[0002]

2. Description of the Related Art Conventionally, a method for forming a full-color image will be generally described. The photoconductor of the photoconductor drum is uniformly charged by the primary charger, and the image is exposed by the laser light modulated by the magenta image signal of the original, an electrostatic latent image is formed on the photoconductor drum, and magenta toner is retained. The electrostatic latent image is developed by a magenta developing device to form a magenta toner image. Next, the magenta toner image developed on the photosensitive drum is transferred to the transferred transfer material by a transfer charger.

On the other hand, the photosensitive drum after the development of the electrostatic latent image is discharged by the discharging charger, cleaned by the cleaning means, and charged again by the primary charger. Formation of a cyan toner image and transfer of the cyan toner image to the transfer material onto which the magenta toner image has been transferred are performed.
The toner images of four colors are transferred to the transfer material by performing the same procedure as the black color. The transfer material having the four color toner images is fixed by the action of heat and pressure by a fixing roller to form a full color image.

The toner used in the color image forming method needs to have good melting property and color mixing property when heat is applied to it, has a low softening point, and has a low melt viscosity and a sharp melt property. It is preferable to use a high toner.

That is, by using such a sharp melt toner, it is possible to widen the color reproduction range of the copy and obtain a color copy faithful to the original image.

However, such a color toner having a high sharp melt property has a high affinity with the fixing roller and tends to be offset to the fixing roller during fixing.

Particularly in the case of a fixing device in a color image forming apparatus, since a plurality of toner layers of magenta, cyan, yellow and black are formed on a transfer material, offset tends to occur particularly easily.

Here, conventionally, in order to improve the releasing property of the toner from the fixing roller, a releasing agent such as silicone oil is applied to the fixing roller. However, in such an image forming method,
The following problems have occurred.

That is, in the existing fixing system in which a releasing agent such as oil is applied to the roller, not only the structure of the main body becomes complicated but also the oil application promotes shortening of the life of the fixing roller. Harmful.

[0010] Further, in accordance with various copying needs in recent years,
Although paper-like resin has been widely used, a film for overhead projectors, also known as a transparency film (Trapene), is generally well known. The feeling was unavoidable, and there was a big problem in the quality of the obtained image.

With respect to these problems, expectations for the establishment of a fixing system which does not require oil coating and the development of a new toner for achieving it have been great.

To solve the above problems, a toner containing a release agent such as wax or a suspension polymerization method toner has been proposed (Japanese Patent Publication No. 36-10231). In this suspension polymerization method, a polymerizable monomer and a colorant (and optionally a polymerization initiator, a cross-linking agent, a charge control agent and other additives) are uniformly dissolved or dispersed to form a monomer composition. After that, this monomer composition is dispersed in a continuous phase (for example, an aqueous phase) containing a dispersion stabilizer by using a suitable stirrer, and a polymerization reaction is simultaneously carried out to obtain toner particles having a desired particle size. I will get it.

In this suspension polymerization method, since droplets of the monomer composition are formed in a dispersion medium of water, which has a large polarity,
The component having a polar group contained in the monomer composition easily exists in the surface layer portion which is the interface with the aqueous phase, and the non-polar component does not exist in the surface layer portion, which is a so-called pseudocapsule structure. By utilizing this characteristic of the manufacturing method, it is possible to contain a wax having a low melting point which cannot be used by other pulverization methods.

The toner produced by the polymerization method can achieve both anti-blocking properties and low-temperature fixing properties, which are contradictory properties, by encapsulating the low melting point wax. That is, since the low melting point wax is encapsulated, the wax that melts at a low temperature improves the thermal conductivity in the toner without lowering the anti-blocking performance, and as a result, the low temperature fixing is possible. More preferably, since the wax melted at the time of fixing also functions as a release agent, it is possible to prevent high temperature offset without applying a release agent such as oil to the fixing roller.

However, even when the polymerized toner having wax encapsulated therein certainly exhibits an advantageous performance at the time of fixing, there is a problem that the transparency of the image after fixing is slightly deteriorated when the transparency film is used as the transfer material. It has happened.

It is possible to reduce the amount of the wax contained in order to prevent the deterioration of the image transparency after the fixing, but this method reduces the releasability of the toner and, conversely, is sufficient. If it is attempted to encapsulate a certain amount of wax in order to obtain a releasing effect, the above phenomenon cannot be avoided.

Further, in the case of producing a transparency film or the like, the light transmittance of the toner on the transfer material is strongly required, and therefore it is generally well made to slow the fixing speed to melt the toner sufficiently. In such a case, the toner on the transfer material tends to be more significantly offset during fixing. Therefore, the offset becomes more severe than in the case of fixing the toner layer on the paper, and the amount of the wax encapsulated in the toner must be designed to be large so as to exert a more sufficient releasing effect.

Further, it was confirmed that the decrease in transparency of the trapene in the method of forming an image by using such a wax-encapsulated toner was cloudy due to crystallization of the wax itself.

Further, in an electrophotographic color or full-color image using the dry developing method, when a full-color image is formed on a transparent film as a transfer material and applied to an OHP device as a projection image, the image on the film is sufficiently colored. Despite exhibiting the property, the projected image has a gray tone as a whole, and a phenomenon that the tone reproduction range becomes extremely narrow occurs. This phenomenon is because the toner formed on the smooth transparent film does not flow sufficiently due to the heating at the time of fixing and has graininess, so that the incident light is scattered at the time of projection and forms a shadow on the screen. .. Especially in the halftone area where the image density is low, the absorption of dyes or pigments in the toner decreases due to the decrease in the number of toner particles, and this absorption level becomes equal to the black absorption level due to the scattering of toner particles. The color becomes gray.

When a toner image on a transfer material such as plain paper is visually inspected, a reflected image of the light irradiated on the fixed image is visually inspected. Therefore, even if some granularity remains on the toner surface, it affects the image quality. Is few. However, when a toner image is observed or projected on a screen by transmitted light like OHP, if the residual shape caused by the toner particles is obvious, the light transmission is deteriorated due to light scattering. Therefore, it is necessary that the toner should have good fixability, the toner graininess at the time of fixing should be reduced, and the offset property at the time of fixing should be good.

[0021]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a color toner for developing an electrostatic charge image which can be fixed without oil coating to obtain a full color image of excellent quality. Especially.

An object of the present invention is to provide a color toner for developing an electrostatic charge image capable of obtaining a full-color transparency sheet image having excellent transparency and good quality.

An object of the present invention is to provide a color toner excellent in low temperature fixing property.

[0024]

The present invention relates to a color toner for developing an electrostatic charge image, which comprises at least a binder resin, a colorant and a release agent, and has a content of 0. The greatest feature is that it contains 01 to 10 wt% of ethylene-vinyl acetate, ethylene-acrylate copolymer, or chlorinated polyethylene.

Further, the present invention is characterized in that the toner is obtained directly by a suspension polymerization method.

Further, in the present invention, in the toner, the release agent is 2 to 100 parts by weight of the total toner binder resin component.
It is characterized by containing 50 parts by weight.

Furthermore, the present invention is characterized in that the binder resin of the toner is mainly composed of an α, β-unsaturated ethylenic monomer and contains a resin having at least one polar group.

The present invention will be specifically described below.

One of the characteristics of the present invention is 0.01 to 1 relative to the content of the releasing agent in the color toner for developing electrostatic image.
0 wt% ethylene-vinyl acetate copolymer, ethylene-
It comprises an acrylate copolymer or chlorinated polyethylene.

As a result of intensive studies by the present inventors, a trapene image was obtained by adding 0.01 to 10 wt% of ethylene-vinyl acetate, ethylene-acrylate copolymer or chlorinated polyethylene to the release agent content. It has been found that the fixing property and offset resistance of the toner can be improved without impairing the transparency of the toner, that is, the fixing can be performed without applying the oil.

As described above, the deterioration of the transparency of the trapene image is due to the crystallization of the release agent (wax),
The transparency of the trapene image is obtained by suppressing the wax crystal growth.

That is, when ethylene-vinyl acetate, ethylene-acrylate copolymer or chlorinated polyethylene is contained in the toner, wax crystal growth is significantly reduced and the transparency of the trapene image is improved.

The content of ethylene-vinyl acetate, ethylene-acrylate copolymer or chlorinated polyethylene is preferably 0.01 to 10 wt% with respect to the release agent content. It is insufficient to inhibit crystal growth and does not improve the transparency of trapene images. On the other hand, when the content exceeds 10 wt% with respect to the release agent content, the suspension polymerization method toner has a deteriorated granulation property and a broad particle size distribution, resulting in an insufficient capsule structure of the toner, and Blocking property and developability deteriorate.

The ethylene-vinyl acetate, ethylene-acrylate copolymer and chlorinated polyethylene of the present invention are represented by the following structures,

[0035]

Embedded image is a long-chain alkylene group, and the preferred range of carbon chain is C ₆ -C ₂₀ . Is a long-chain alkylene group, and the preferred range of carbon chain is C ₆
It is a ~C _20.

[0036]

[Chemical 3] In the production of the toner of the present invention, the constituent materials are well kneaded by a heat kneader such as a hot roll, a kneader or an extruder, and then mechanical pulverization or classification is carried out, or the binder resin solution is colored. After dispersing the constituent materials such as an agent, a method of obtaining by spray-drying, or after mixing a predetermined material with the monomer to form the binder resin, and then polymerizing this emulsion suspension to give a toner. Each method such as a method for producing a polymerized toner to be obtained can be applied, but more preferably, a polymerized toner capable of including a larger amount of a wax component is preferable.

The polymerized toner of the toner used in the present invention will be described in detail below.

The polymerized toner used in the present invention is obtained by the following method.

That is, a release agent / colorant /
A monomer system containing a dispersion stabilizer is prepared by adding an additive such as a charge control agent, heating the mold release agent until it is dissolved or melted, and uniformly dissolved or dispersed by a homogenizer / ultrasonic disperser. Disperse in an aqueous phase having the same temperature as the quantitative system by using an ordinary stirrer, homomixer, homogenizer or the like.
Preferably, the stirring speed and time are adjusted so that the monomer droplets have a predetermined toner particle size, generally a particle size of 30 μm or less, and thereafter, the particle state is maintained by the action of the dispersion stabilizer, and It suffices to carry out stirring to such an extent that sedimentation is prevented. The polymerization temperature is set to a temperature not higher than the deposition temperature of the release agent, and the polymerization initiator is added to carry out the polymerization. After the reaction is completed, the produced toner particles are collected by washing and filtration and dried. In the suspension polymerization method, it is usually preferable to use 300 to 3000 parts by weight of water as a dispersion medium with respect to 100 parts by weight of the monomer system.

Polymerizable α, β which can be used in the above-mentioned polymerized toner
-Unsaturated ethylenic monomers include styrene-based monomers such as styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, p-methoxystyrene, p-ethylstyrene, methyl acrylate, and acrylic. Ethyl acetate, n-butyl acrylate, isobutyl acrylate, n-propyl acrylate, n-octyl acrylate, dodecyl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, 2-chloroethyl acrylate, phenyl acrylate, etc. Acrylic esters, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-octyl methacrylate, dodecyl methacrylate, 2-ethylhexyl methacrylate, stearyl methacrylate, methacrylic acid Phenyl, dimethylaminoethyl methacrylate, methacrylic acid esters other acrylonitrile such as diethylaminoethyl methacrylate, methacrylonitrile, and the like monomers acrylamide.

These monomers may be used alone or in combination. Among the above-mentioned monomers, it is preferable to use styrene or a styrene derivative alone or in combination with other monomers, from the viewpoints of developing characteristics and durability of the toner.

The dispersion medium used in the present invention is any suitable stabilizer such as polyvinyl alcohol, gelatin, methyl cellulose, methyl hydroxypropyl cellulose, ethyl cellulose, sodium salt of carboxymethyl cellulose, polyacrylic acid and its salts, starch and phosphorus. Tricalcium acid, aluminum hydroxide, magnesium hydroxide, calcium metasilicate, barium sulfate, bentonite and the like can be used by dispersing them in the aqueous phase. This stabilizer is 0.2 per 100 parts of the polymerizable monomer.
It is preferred to use ~ 20 parts by weight.

Further, because of the fine dispersion of these stabilizers,
0.001 to 0.1 part by weight of surfactant may be used. This is for accelerating the intended action of the dispersion stabilizer, and specific examples thereof include sodium dodecylbenzene sulfate, sodium tetradecyl sulfate, sodium pentadecyl sulfate, sodium octyl sulfate, sodium oleate, and lauric acid. Examples thereof include sodium, potassium stearate, calcium oleate and the like.

It is more preferable to add a polar group-containing polymer / copolymer to the monomer system for polymerization. Further, in the present invention, a monomer system containing a polymer / copolymer having a polar group or a cyclized rubber is suspended in an aqueous phase in which a dispersant having an opposite charge to the polar polymer is dispersed. It is preferable to polymerize. That is, the cationic or anionic polymer / copolymer contained in the monomer system, or the cyclized rubber is dispersed in the aqueous phase and is charged with an oppositely charged anionic or cationic dispersant to promote polymerization. Electrostatically attracted to the surface of the particles that become the toner inside, and by covering the surface of the particles with a dispersant, the particles are prevented from coalescing and stabilized, and the polar polymer added during polymerization gathers on the surface layer of the particles that become the toner. Therefore, it becomes a kind of shell-like shape, and the obtained particles have a capsule structure. Uses a relatively high molecular weight polar polymer / copolymer or cyclized rubber to give toner particles excellent properties such as blocking properties and development abrasion resistance, while internally improving the fixing properties with a relatively low molecular weight. By polymerizing so as to contribute, a toner satisfying contradictory requirements of fixing property and blocking property can be obtained. The polar polymers / copolymers and the oppositely charged dispersants which can be used in the present invention are exemplified below. (1) Examples of the cationic polymer include polymers of nitrogen-containing monomers such as dimethylaminoethyl methacrylate and diethylaminoethyl methacrylate, and copolymers with styrene / unsaturated carboxylic acid ester and the like. (2) Examples of the anionic polymer include nitrile monomers such as acrylonitrile, halogen-containing monomers such as vinyl chloride, unsaturated carboxylic acids such as acrylic acid and methacrylic acid,
Other examples include unsaturated dibasic acids, unsaturated dibasic acid anhydrides, polymers such as nitro monomers, copolymers with styrene monomers, and polyester resins. A cyclized rubber may be used instead of these polar polymers. (3) Silica fine powder is preferably used as the anionic dispersant, and particularly has a BET specific surface area of 200 m ² / g.
The above colloidal silica is suitable. (4) As the cationic dispersant, an aminoalkyl-modified colloidal silica (preferably having a BET specific surface area of 20) is used.
0 m ² / g or more), hydrophilic positively chargeable silica fine powder, aluminum hydroxide, calcium phosphate and the like.

Such a dispersant is prepared by using 100 polymerizable monomers.
It is preferable to use 0.2 to 20 parts by weight based on parts by weight. More preferably, it is 0.3 to 15 parts by weight.

In the present invention, it is desirable to add a charge control agent to the toner material in order to control the chargeability of the toner. As these charge control agents, among known ones, those having almost no polymerization inhibitory property / water phase transfer property are used. For example, a nigrosine dye as a positive charge control agent,
Triphenylmethane-based dyes, quaternary ammonium salts, amine-based and polyamine-based compounds, and the like, examples of negative charge control agents include metal-containing salicylic acid-based compounds, metal-containing monoazo dye-based compounds, styrene-acrylic acid copolymers, Examples thereof include styrene-methacrylic acid copolymer. It is more preferable to use a colorless or pale color charge control agent so as not to impair the color tone of the color toner.

As the coloring agent used in the present invention, known coloring agents can be used. For example, carbon black, iron black, C.I. I. Direct Red 1, C.I. I. Direct Red 4, C.I. I. Acid Red 1, C.I. I. Basic Red 1, C.I. I. Mordant Red 30, C.I.
I. Direct Blue 1, C.I. I. Direct Blue 2, C.I. I. Acid Blue 9, C.I. I. Acid Blue 15, C.I. I. Basic Blue 3, C.I. I. Basic Blue 5, C.I. I. Mordant Blue 7, C.I. I.
Direct Green 6, C.I. I. Basic Green 4, C.I. I. Dyes such as Basic Green 6, Yellow Lead, Cadmium Yellow, Mineral Fast Yellow, Navel Yellow, Naphthol Yellow S, Hansa Yellow G, Permanent Yellow NCG, Tartrazine Lake, Molybdenum Orange, Permanent Orange GT
R, benzidine orange G, cadmium red, permanent red 4R, watching red calcium salt,
Brilliant Carmine 3B, Fast Violet B,
There are pigments such as methyl violet lake, dark blue, cobalt blue, alkali blue lake, Victoria blue lake, quinacridone, rhodamine B, phthalocyanine blue, fast sky blue, pigment green B, malachite green lake, and final yellow green G. When the toner is obtained by using the polymerization method in the present invention, it is necessary to pay attention to the polymerization inhibitory property and the water phase transfer property of the colorant, and it is preferable to use surface modification, for example, a substance that does not inhibit the polymerization. It is better to give it a hydrophobic treatment.

As the release agent used in the present invention, paraffin wax is preferably used, and the melting point thereof is preferably 30 to 150 ° C, more preferably 50 to 100 ° C.

The melting point was the temperature of the maximum endothermic peak by DSC. Such a releasing agent is used as the binder resin component 100.
2 to 50 parts by weight (more preferably 10 to 10 parts by weight)
30 parts by weight) is preferably used.

When the release agent is less than 2 parts by weight with respect to 100 parts by weight of the binder resin component, the releasing effect is not expected.

On the other hand, if it exceeds 50 parts by weight, the granulation property at the time of granulation deteriorates and the particle size distribution does not become sharp. In addition, the obtained toner is inferior in blocking property.

As the polymerization initiator, any suitable polymerization initiator, for example, 2,2′-azobis- (2,4-dimethylvaleronitrile), 2,2′-azobisisobutyronitrile, 1, 1'-azobis (cyclohexane-1-
Carbonitrile), 2,2′-azobis-4-methoxy-2,4-dimethylvaleronitrile, azobis or diazo polymerization initiators such as azobisisobutyronitrile, benzoyl peroxide, methyl ethyl ketone peroxide,
Examples thereof include peroxide-based polymerization initiators such as diisopropyl peroxycarbonate, cumene hydroperoxide, 2,4-dichlorobenzoyl peroxide and lauroyl peroxide. Further, the above-mentioned peroxides as a redox initiator may be used in combination with a reducing agent such as dimethylaniline, mercaptans, tertiary amines, iron (II) salt, sodium bisulfite and the like. These polymerization initiators are preferably used to obtain a desired molecular weight, but generally, the addition amount of 0.1 to 10% by weight of the polymerizable monomer is sufficient.

Next, a color image forming method using the color toner of the present invention will be described.

FIG. 1 is a schematic sectional view of an electrophotographic apparatus capable of forming a full-color image according to the present invention. In the drawing, a transfer material conveying system I is provided from the right side of the apparatus main body 100 (right side in FIG. 1) to a substantially central portion of the apparatus main body 100, and the transfer material conveying system I is provided at a substantially central portion of the apparatus main body 100. The latent image forming section II provided near the transfer drum 8 and the developing means (that is, the rotary developing device III) provided near the latent image forming section II. Broadly divided. The transfer material transport system I described above is used in the apparatus main body 100.
The transfer material supply trays 101 and 102 that are detachable from the opening formed on the right side of FIG. 1 (right side of FIG. 1), and the paper feed rollers 103 that are arranged substantially directly above the trays 101 and 102. 104, the sheet feeding guides 4A and 4B provided with the sheet feeding roller 106 disposed near the sheet feeding rollers 103 and 104, and the sheet feeding guide 4b, and rotated near the outer peripheral surface. The contact roller 7, the gripper 6, the transfer material separating charger 12, and the separation claw 14 are arranged from the upstream side to the downstream side in the direction, and the transfer charger 9 and the transfer material separating side are provided on the inner peripheral side. A charger 13 is provided. The transfer drum 8 rotatable in the direction of the arrow in FIG. 1 and the conveyor belt means 1 provided near the separating claw 14.
5 and the apparatus main body 1 which is disposed close to the end of the conveyor belt means 15 in the conveying direction and extends outside the apparatus main body 100.
00, a discharge tray 17 that is removable and a fixing device 16 that is adjacent to the discharge tray 17.

The latent image forming portion II has an outer peripheral surface abutting on the outer peripheral surface of the transfer drum 8 and an image carrier (that is, the photosensitive drum 2) rotatable in the direction of the arrow in FIG. A static elimination charger 10, a cleaning unit 11, a primary charger 3, and the photosensitive member, which are disposed near the outer peripheral surface of the photosensitive drum 2 from the upstream side to the downstream side in the rotation direction of the photosensitive drum 2. The drum 2 is provided with an image exposure means such as a laser beam scanner for forming an electrostatic latent image on the outer peripheral surface and an image exposure reflection means such as a polygon mirror. The rotary developing device III includes a rotatable housing (hereinafter referred to as “rotating body”) 4a, and the photosensitive member at a position which is respectively mounted in the rotating body 4a and faces the outer peripheral surface of the photosensitive drum 2. A yellow developing device 4Y, a magenta developing device 4M, and a cyan developing device 4 which are configured to visualize (that is, develop) the electrostatic latent image formed on the outer peripheral surface of the drum 2.
C and a black developing device 4BK.

The sequence of the entire image forming apparatus having the above-described configuration will be described by taking the case of the full color mode as an example. When the photoconductor drum 2 described above rotates in the direction of the arrow in FIG. 1, the photoconductor on the photoconductor drum 2 is uniformly charged by the primary charger 3. When the photoconductor is uniformly charged by the primary charger 3, a document (not shown)
Image exposure is performed by the laser light E modulated by the yellow image signal of No. 3, an electrostatic latent image is formed on the photoconductor drum 2, and the yellow developing device 4Y previously placed at the developing position by the rotation of the rotating body 4a. The electrostatic latent image is developed by.

On the other hand, the paper feed guide 4A and the paper feed roller 10
6. The transfer material conveyed through the paper feed guide 4b is held by the gripper 6 at a predetermined timing,
It is electrostatically wound around the transfer drum 8 by the contact roller 7 and the electrode facing the contact roller 7. The transfer drum 8 rotates in the direction of the arrow in FIG. 1 in synchronism with the photoconductor drum 2, and the visible image developed by the yellow developing device 4Y is transferred to the outer peripheral surface of the photoconductor drum 2 and the transfer drum 8.
The image is transferred by the transfer charger 9 at a portion in contact with the outer peripheral surface of the. The transfer drum 8 continues to rotate,
Prepare for the transfer of the next color (magenta in FIG. 1).

On the other hand, the photosensitive drum 2 is discharged by the discharging charger 10 and cleaned by the cleaning means 11 and then charged again by the primary charging device 3 and the image as described above is generated by the next magenta image signal. Receive exposure. The rotary developing device rotates while the electrostatic latent image based on the magenta image signal is formed on the photoconductor drum 2 by the image exposure to set the magenta developing device 4M at the predetermined developing position. Perform predetermined magenta development. Subsequently, the above-described process is performed for cyan color and black color respectively, and when the transfer of four colors is completed, the multicolor image formed on the transfer material is charged by the chargers 12 and 13. The charge is removed, the grip of the transfer material by the gripper 6 is released, and the transfer material is separated from the transfer drum 8 by the separation claw 14 and sent to the fixing device 16 by the conveyor belt 15 and fixed by heat and pressure. A series of full-color print sequences are completed, and the required full-color print image is formed.

The fixing device 16 comprises a heat fixing roller 161 and a pressure roller 162. Heating roller 161
Preferably has a surface layer such as a fluororesin having excellent release characteristics. It is preferable that the surface layer of the pressure roller 162 is made of a fluororesin, as is the case with the heating roller, or made of silicon rubber or the like.

The present invention will be specifically described based on the following examples.

[0061]

Example 1 Hydrophilic positive silica 0.5 to 1300 parts by weight of ion-exchanged water
After adding a weight part and heating at 60 degreeC, it stirred at 7000 rpm using a homomixer.

Styrene 170 parts by weight 2-Ethylhexyl acrylate 30 parts by weight Paraffin wax (mp. 65 ° C.) 40 parts by weight Ethylene-vinyl acetate copolymer 0.3 parts by weight (0.75 wt% with respect to wax) C.I. I. Pigment Yellow 17 10 parts by weight Styrene-methyl methacrylate copolymer 2 parts by weight Di-tert-butyl salicylate metal compound 2 parts by weight In a high line mill (Tokushu Kika Kogyo Co., Ltd.) kept at 70 ° C. Part), wax, ethylene-
The vinyl acetate copolymer and the colorant were mixed initially and dispersed, and then other compositions were mixed to obtain a monomer mixture.

While maintaining the temperature at 70 ° C., 10 parts by weight of the initiator dimethyl 2,2′-azobisisobutyrate was added and dissolved to prepare a monomer composition. The monomer composition was added to the dispersion medium prepared in the homomixer container.

Homomixer 70 at 70 ° C. under nitrogen atmosphere
00 rpm. The mixture was stirred for 15 minutes to granulate the monomer composition. Then, the mixture was stirred with a paddle stirring blade and reacted at 70 ° C. for 10 hours.

After the completion of the polymerization reaction, the system was cooled, alkali was added to dissolve the silica, and the polymer was filtered, washed with water and dried to obtain a polymerized toner of 9.2 μm.

To 100 parts by weight of the obtained toner, B
0.7 part by weight of hydrophobic silica having a specific surface area of 200 m ² / g according to the ET method was externally added. To 7 parts by weight of this toner, 93 parts by weight of a Cu-Zn-Fe ferrite carrier whose surface was coated with a styrene-methyl methacrylate copolymer was mixed to obtain a developer.

An image was formed using this developer using a commercially available color copying machine (CLC-500 Canon).

An unfixed image on the transfer material just developed and transferred by a modified machine of CLC-500 is externally fixed (a fixing soft roller is a fluorine-based soft roller, and a pressure roller is a soft roller).
It was fixed without applying oil with a silicon roller.

As a result, the obtained image was a clear transparency image without any offset.

When actually projected with an overhead projector, an image having excellent transparency was obtained, and the effect of the color toner of the present invention was shown.

Examples 2-5, Comparative Examples 1-2 Similar to Example 1, the formulations shown in Table 1 were used for Examples 2-5 and Comparative Example 1.
.About.2 polymerized color toners were obtained.

The fixing property (offset resistance) and the trapene transparency were evaluated in the same manner as in Example 1.

In Comparative Example 2, the particle size distribution was broad during granulation, and blocking occurred during drying.
It could not be turned into toner.

[0074]

[Table 1]

[0075]

EFFECTS OF THE INVENTION It is possible to obtain a full-color image of excellent quality by fixing without applying oil, and in particular, a full-color transparency sheet having excellent transparency can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an electrophotographic apparatus capable of forming a full-color image.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location 7144-2H G03G 9/08 361 7144-2H 384 (72) Inventor Tatsuya Nakamura 3 Shimomaruko Ota-ku, Tokyo Canon Inc. 30-2 No. 3 (72) Inventor Kazuyuki Miyano 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (4)

[Claims] 1. A color toner for developing an electrostatic charge image comprising at least a binder resin, a colorant and a release agent,
A color toner for developing an electrostatic charge image, comprising 0.01 to 10 wt% of a material having the following structural formula relative to the content of a release agent. [Chemical 1] 2. The color toner for electrostatic image development according to claim 1, wherein the color toner is directly obtained by a suspension polymerization method. 3. The static release agent according to claim 1, wherein the release agent is polyalkylene and is contained in an amount of 2 to 50 parts by weight based on 100 parts by weight of the total toner binder resin component. Color toner for charge image development. 4. The binder resin of the toner contains an α, β-unsaturated ethylenic monomer as a main component and at least a resin having one or more polar groups. 4. The color toner for developing an electrostatic charge image according to any one of 1 to 3.