JP3148942B2 - Color image forming method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the electrophotographic method to be applied to a color copying machine or a color printer or the like, relates to color image forming method for forming a high-quality full-color images.

[0002]

2. Description of the Related Art As a method of forming a full-color image by electrophotography, for example, B (blue), G (green), and R (red) are formed on a photoreceptor using an organic or inorganic photoconductive material. Further, if necessary, an electrostatic latent image is formed for each color by irradiating color separation light obtained from a color CCD through a filter such as ND (neutral) or the like. ), M (magenta), C (cyan) and, if necessary, color toner such as BK (black) to form a color toner image for each color.

Next, the color toner images of the respective colors are superimposed and formed on the photoreceptor and then collectively transferred to a transfer member, or each time the color toner images of the respective colors are formed on the photoreceptor, The image is transferred onto a transfer member and superimposed on the transfer member. Thereafter, the superimposed color toner image on the transfer body is heated and fixed by a heating roller and a pressure roller to form a color image.

A color toner image used in such an electrophotographic method is formed on a color image transfer member. Usually, the color image transfer member has a plain paper, an OHP film, or a specially treated surface. A transfer body or the like is used. In order to obtain a color image with high image quality, a transfer body having a specially treated surface is preferable.For example, surface roughness is imparted to impart gloss and obtain color reproduction and gloss comparable to photographs and prints. For this reason, Japanese Patent Application Laid-Open No. 63-92965 discloses an attempt to improve the problem by forming a transparent resin layer on an image supporting substrate and embedding toner particles on the transparent resin layer with a heating roller. .

[0005]

However, as a result of intensive studies by the present inventors, the above technique can provide a certain degree of gloss but cannot provide a picture or print-level image quality. In addition, since the transfer body has a thermoplastic resin such as an acrylic resin on its surface, it is liable to be subjected to frictional charging and electrostatic recording at a paper feeding stage or the like, and to be electrostatically charged on the transfer body or due to adhesion of dust such as paper dust. When the electrotransfer is performed, a transfer failure occurs in which the color toner image is disturbed, and the color image quality is deteriorated. In order to prevent such static electricity, it is conceivable to add a quaternary ammonium salt type surfactant generally called an antistatic agent, carbon, polyvinyl alcohol, etc., but a transparent resin made of a thermoplastic resin is considered. When added to the layer, the glass transition point of the resin in the transparent resin layer is lowered, causing the transparent resin layer to have a fusibility, and the image adheres to another member and peels off, thereby deteriorating the storability. Alternatively, if the antistatic agent is colored, the color image becomes defective.

[0006] The present invention has been made in view of the above circumstances, and its object is to provide a Luke color image forming method can of providing high-quality color image having a gloss. Another object of the present invention is to be carried out electrostatic transfer provides a catabolic color image forming method is disturbed color image. Another object of the present invention is to provide a Luke color image forming method excellent in storage stability without fusible.

[0007]

Means for Solving the Problems The above object is to transfer the color toner image formed by three or more kinds of color toners on a photosensitive optical body on the color image transfer member, the color on the color image transfer member In a color image forming method in which a toner image is melted and fixed, the color image transfer body has a layer thickness of 20 to 20 made of thermoplastic styrene resin on the surface of a transfer body substrate.
A transparent resin layer having a thickness of 200 μm was provided, and fine particles of an inorganic oxide produced by a flame hydrolysis method were dispersed and contained on the surface of the transparent resin layer at a content of 1.0 to 5.0% by weight .
Having an inorganic oxide fine particle surface layer having a thickness of 1 to 10 [mu] m, before
The color toner is made from polyester resin as binder resin.
Characterized by containing at least 50% by weight of
Image forming method and three or more types of color
Image transfer of color toner image formed by toner
Color toner image transferred onto the body,
In a color image forming method of melting and fixing
The color image transfer member has a thermoplastic resin on the surface of the transfer member substrate.
Transparent resin of 20-200 μm in thickness made of a styrene resin
Layer, and the surface of the transparent resin layer is subjected to a flame hydrolysis method.
1.0 to 5.0 weight of the produced inorganic oxide fine particles
% And a layer thickness of 1 to 10 μm dispersed and contained.
Having an oxide fine particle surface layer, wherein the color toner is
Contains ester resin at 50% by weight or more of binder resin component
And fixing the color toner image to the color image transfer member by fusing the color toner image with a belt-shaped heating and conveying member.

That is, in the present invention, a surface layer containing inorganic oxide fine particles dispersed therein is provided on the surface of the thermoplastic transparent resin layer. Inorganic oxide particles, compared to other surfactants and resins,
Since there is no compatibility with the thermoplastic resin, the glass transition point of the thermoplastic resin is not reduced. Therefore, the function of the thermoplastic transparent resin layer can be maximized. Alternatively, colored materials such as carbon are inappropriate, and colorless materials must be selected. As the selected inorganic oxide fine particles, those having triboelectricity cannot be prevented from generating static electricity, which is the object of the present invention, so that those having no triboelectricity are selected. Furthermore, in order to provide glossiness, it is necessary to design so as to transmit light, and ultrafine particles are selected. As a result of studies based on such technical ideas, it has been found that titanium oxide fine particles and aluminum oxide fine particles are suitable as inorganic oxide fine particles, and the present invention has been achieved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

A transparent resin layer is formed on the surface of the color image transfer member according to the present invention. As the transfer member substrate, a plain paper, an OHP film or the like which is usually used is used.

As the resin constituting the transparent resin layer, a styrene-based thermoplastic resin is used. Among them, a styrene-acryl copolymer resin is preferable. Styrene-based monomers and (meth) acrylic acid-based monomers used to obtain styrene-based resins include, for example, styrene,
Chlorostyrene, styrene monomers such as vinyl toluene, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, dodecyl acrylate, lauryl acrylate, 2-ethylhexyl acrylate, dimethylaminoethyl acrylate, Acrylics such as diethylaminoethyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, dodecyl methacrylate, lauryl methacrylate, 2-ethylhexyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, etc. Monomers can be mentioned. Further, in order to obtain a crosslinkable styrene resin, a crosslinkable monomer such as divinylbenzene, diethylene glycol dimethacrylate, or triethylene glycol trimethacrylate is used for all monomers.
0.1 to 5.0% by weight can be used. Further, a chain transfer agent such as α-methylstyrene dodecyl mercaptan may be used in an amount of 20% by weight or less in order to adjust the molecular weight to make the solvent soluble.

In order to form a transparent resin layer using the above resin, the resin is dissolved in a solvent such as toluene, acetone, ethyl alcohol, methyl ethyl ketone, tetrahydrofuran, and the like, coated on a transfer member and dried. It is formed.

The thickness of the transparent resin layer is preferably from 20 to 200 μm, more preferably from 20 to 80 μm, in order to provide a high-quality image with excellent gloss. When the thickness of the transparent resin layer is less than 20 μm, when the color toner image is melted and fixed, it is not sufficiently embedded in the transparent resin layer, resulting in an image having many irregularities and lacking in glossiness. On the other hand, the thickness of the transparent resin layer
If it exceeds 200 μm, the light absorption increases, the color tone of the color image decreases, and the color reproducibility faithful to the original is poor.

In the present invention, an inorganic oxide fine particle surface layer containing inorganic oxide fine particles dispersed therein is formed on the surface of the transparent resin layer formed as described above.

As the inorganic oxide fine particles used in the present invention, aluminum oxide fine particles or titanium oxide fine particles are preferable. Among such inorganic oxide fine particles, it is preferable that the inorganic oxide fine particles be manufactured not by a precipitation method or a mineral refining method but by a flame hydrolysis method of aluminum chloride or titanium chloride. This is effective in achieving the object of the present invention since inorganic oxide fine particles having fine primary particles and extremely high chemical purity (purity of 99% or more) can be obtained. As a result, the structure is such that aluminum oxide is mainly a delta structure and titanium oxide is mainly an anatase structure. The primary particles preferably have an average particle size of 15 to 40 nm and a BET specific surface area of 40 to 200 m ² / g.

In order to form the inorganic oxide fine particle surface layer by including the inorganic oxide fine particles on the surface of the transparent resin layer, the inorganic oxide fine particles are dispersed by using the thermoplastic resin for forming the transparent resin layer as a binder. It is manufactured by coating with the same method as that for the transparent resin layer.

The ratio of the inorganic oxide fine particles contained in the surface layer of the inorganic oxide fine particles is 1.0 to 5.0% by weight based on the surface of the inorganic oxide fine particles. If it is too small, the effect of the present invention is impaired, and if it is too large, the light transmittance becomes poor and the color image quality is reduced. The layer thickness of the inorganic oxide fine particle surface layer may be 1 to 10 μm. If it is too small, the effect of the present invention is impaired, and if it is too large, the light transmittance becomes poor and the color image quality is reduced.

[0018] involved in the present invention configured as described above
The transfer body contains inorganic oxide fine particles having almost no triboelectricity, so that the transfer body is prevented from being charged with static electricity, and the color image is disturbed even when the image forming method of the present invention is used. Does not occur. Also, dust such as paper dust is prevented from adhering to the transfer paper, and image defects due to dust such as paper dust do not occur.

In the present invention, when the titanium oxide fine particles are used, they have a slight opacity, but have a long-term preservability because of having an ultraviolet shielding effect, and can prevent the color image from deteriorating due to the yellow-brown change of the transfer member. A further effect that it can be prevented can be added.

In the present invention, when the transfer member having the above-described transfer member having the transparent resin layer is fixed by a belt-shaped heating member, the toner particles are easily softened, and the toner particles are easily embedded in the transparent resin layer. Even in the molten state, the releasability from the heating element is good, and the image can be prevented from rising due to adhesion to the heating element and the image from being lost at the time of release. Thereby, the obtained color image can provide an image having excellent glossiness. In addition, by having the inorganic oxide fine particle layer on the surface, in a fixing method using a belt-shaped fixing member, the inorganic oxide fine particles act as a release point, and the releasability is excellent.

The color developer for forming a color toner image used in the present invention includes a non-magnetic color toner and a magnetic toner from the viewpoint of improving fluidity, triboelectricity, developability and image reproducibility. A two-component color developer composed of a carrier is preferably used.

The non-magnetic color toner is prepared by mixing colored resin particles composed of a binder resin, a colorant, a charge control agent and other property improving agents if necessary, and inorganic oxide fine particles for external addition as required. Obtained.

As the binder resin of the color toner according to the present invention , styrene-acrylic resin, styrene-
Examples of the color toner include a butadiene resin and a polyester resin. The color toner of the present invention improves the incompatibility with the transparent resin layer of the color image transfer body, thereby expanding the image after fixing and the boundary area. Binder to give sharpness of
To constitute at least 50 wt% of the resin component in the polyester resin
You .

The colorants include carbon black as a black toner, phthalocyanine blue as a cyan toner, benzidine yellow, quinoline yellow, chromophtal yellow as a yellow toner, and chromophtal red and PV Fast Red as a magenta toner. And other commonly used coloring agents.

As the charge control agent, a metal complex salt of a monoazo dye, a metal complex with a carboxylic acid compound, a quaternary ammonium salt compound, a nigrosine dye, or the like may be used.

As the other property improving agent, wax such as paraffin wax, polyethylene wax, and polypropylene wax may be used in an amount of 10 parts by weight or less based on 100 parts by weight of the binder resin.

As the above-mentioned inorganic oxide fine particles for external addition, 5% or less of silica, titanium oxide or the like, which has been subjected to a hydrophobizing treatment with a silane coupling agent, can be used by adding 5% or less to the toner.

As the carrier, iron, ferrite,
Magnetic particles such as magnetite and magnetic particles obtained by coating the magnetic particles with a styrene-acrylic resin, a silicon resin, a fluorine resin, or the like can be used.

In the color image forming method of the present invention, for example, a color toner image formed on a photoreceptor formed by an electrophotographic method is electrostatically transferred onto a transfer body, and the resultant is heated and melt-fixed by a belt-shaped heating and conveying body. Then, a color image is formed such that the color toner image is embedded in the transparent resin layer.

According to this configuration, since the heating time is heated during the conveyance by the belt-shaped member, the heating is performed for a much longer time than the heating roller method, and the transparent resin layer is sufficiently melted. Therefore, the toner particles are easily embedded, and the toner particles are in a molten and fluid state and are permanently deformed. Further, even at the time of releasing, since the belt-like heating and the releasability of the transfer body and the toner image from the transfer body and the toner image are good, the toner image does not float and the image is not lost due to the transfer to the belt-like member. Therefore, the obtained color image is prevented from irregular reflection of the illumination light, is excellent in glossiness, can be made of high quality without adhesion of the image to the belt-shaped heating and the conveyance body, and can have good storability.

FIG. 1A shows a light reflection state in a case where there is no transparent resin layer, and FIG. 1B shows a case where the transparent resin layer has a transparent resin layer and a fixed color toner image is formed in the transparent resin layer. 3 shows the light reflection status of the present invention embedded in the hologram. In FIG. 1, reference numeral 1 denotes a transfer body made of plain paper, 2A denotes a fixed color toner image, and 2B denotes a transparent resin layer.

As is clear from FIG. 1, when the fixed color toner image 2A is embedded in the transparent resin layer 2B, there is no light scattering and the reflection is good, so that the color having good gloss is obtained. An image is obtained.

As a fixing device, for example, a fixing device using a belt-shaped fixing member shown in FIG. 2 can be mentioned.
By a belt-shaped heating and transporting body that moves under a member containing a heat source, the color toner adhered to the transparent resin layer on the surface of the transfer body is heated and melted in the transparent resin layer, and then cooled and fixed. In addition, the belt-like heating and conveying member can be separated from the transfer member to form a color image.

In FIG. 2, 1 is a transfer member, 2 is a color toner image, and 3 is a heating roll. The heating roll 3 has a heat source 6 such as an infrared lamp inside. The heating roll 3 has an elastic layer 5 made of rubber or the like provided on the outer periphery of a core fixed to a rotating shaft. 7 is a pressure roll, 8a is an upper heat-resistant belt, and 8b is a lower heat-resistant belt. In these heat resistant belts, a silicon resin is treated on the surface of a heat resistant resin such as polyimide. 9 is a peeling roll, and 10 is a pressure roll for the peeling roll. Reference numeral 11 denotes a separation claw of the transfer body 1 provided as needed, and reference numeral 12 denotes a forced cooling device provided as needed.

In the fixing device shown in FIG. 2, the transfer body 1 carrying the color toner image 2 is heated and conveyed by heat-resistant belts 8a and 8b moving below the member having the heat source 6, and the color on the transfer body 1 is transferred. The toner image is melted and fixed, and cooled by natural air cooling or forced cooling device 12 so as to be hardly deformed. Therefore, an extremely smooth color image can be obtained.

In the color image forming method of the present invention,
Image exposure is performed on a photoreceptor to form an electrostatic latent image for each color, and the latent images are superposed and developed with toners of respective colors of Y, M, C, and BK to form a color toner image. The image and the transfer member are collectively transferred, and then heat-fixed to form a color image.

Hereinafter, the color image forming method of the present invention will be described more specifically.

FIG. 3 is a sectional view of the color image forming apparatus of the present invention, wherein K is an image reading section, L is a laser writing section, M is an image forming section, and N is a sheet feeding section.

The image reading section K includes a carriage 22 on which a mirror 25 and a halogen lamp 24 are mounted, a movable mirror unit 23 on which mirrors 26 and 27 are mounted, a lens
30, a color CCD 33, and an image processing device 34.

The laser writing section L comprises a motor 41, a polygon mirror 42 and the like.

The image forming section M includes an organic photosensitive member 40 used for negative charging, a pre-exposure lamp 45A, and a scorotron charger 45B.
Developing units 46Y, 46M, 46C and 46BK filled with a developer containing negative toners of Y, M, C and BK to which an AC bias P1 and a DC bias P2 have been applied; A transfer device 47 for batch-transferring the obtained color toner image onto a transfer body, a separator 48, a fixing device 55 for fixing the color toner image, and a cleaning device 49 for removing the toner remaining on the organic photoconductor 40. It is configured. The fixing device 55 is as shown in FIG.

The paper supply section N has delivery rollers 51A and 51B for delivering the transfer material PA or PB from the paper supply cassette 50A or 50B to the transfer device 47 and the separator 48, and a timing roller 52.

The color image of the present invention is formed using the color image forming apparatus configured as described above. That is,
The start button is turned on, and an initialization signal is output to the image reading unit K via the control circuit.

In the first rotation of the photoconductor 40, the original 20 on the original table 21 of the image reading section K is optically scanned by the halogen lamp 24 of the carriage 22, and the mirror groups 25, 26, 27 driven by the stepping motor. A light image of the original is formed on the light receiving surface of the color CCD 33 through the lens 30 via the lens 30 and is converted into an electric signal. The obtained electric signal is subjected to A / D conversion, shading correction,
Signal processing such as gradation correction, masking, ghost processing, and multi-value processing is performed to create Y, M, C, and BK image data. Then, the Y image signal as the first color signal is output to the next laser reading unit L.

A laser beam oscillated from a laser light source is pulse-width-modulated by the Y image signal, is rotationally scanned by a polygon mirror 42 rotationally driven by a motor 41, and is bent by a mirror 44 via an fθ lens 43. After pre-exposure with the pre-exposure lamp 45A and image exposure on the surface of the photoreceptor 40 uniformly charged by the charger 45B to form an electrostatic latent image, non-contact reversal development is performed by the developer 46Y. .

While holding the obtained Y toner image on the photoconductor 40, the Y toner image is passed under the cleaning device 49 which has been separated from the surface of the photoconductor 40, and the photoconductor 40 is formed to form the next M toner image. Is transported to the charger 45B with the second rotation of.

The surface of the photoconductor 40 carrying the Y toner image is uniformly negatively recharged by the charger 45B, and then the image processing unit 34 is scanned by the next scanning of the image reading unit K.
Performs an image exposure of a laser beam based on an M image signal which is a second color signal from the image forming apparatus, forms an electrostatic latent image on the photosensitive member 40, and performs non-contact with the developing device 46M in the same manner as in the developing device 46Y. The M toner image is formed on the Y toner image by reversal development.

In the same manner, the third and fourth photoconductors 40
At the first time, after the image exposure of the laser beam based on the C image signal, the development by the developing unit 46C, the image exposure of the laser beam based on the BK image signal, and the development by the developing unit 46BK, the Y toner image and the M toner A color toner image is formed by superimposing the C toner image and the BK toner image on the image. The developing bias applied to the developing sleeve is selectively switched and used by a bias switching unit. The unused developing sleeve is floated.

The obtained color toner image is sent out of the cassette 50A to the transfer area via the roller 51A and the timing roller 52 at the same time as the image formation, and is transferred to the transfer area PA on the specific transfer member PA of the present invention. Batch transfer by action.

Transfer member PA on which a color toner image has been transferred
Is separated from the photoreceptor 40 by a separator 48, and is conveyed to a fixing device 55 by a conveying belt 54, and is heated and fixed by the fixing device 55 (the configuration of FIG. 2) to form a color image.
The paper is discharged to a paper discharge tray 57 by 56.

Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited thereto.

Example-1 <Preparation of Transfer Body> Resin of styrene / α-methylstyrene / n-butyl acrylate / divinylbenzene copolymer (weight composition: 79.2: 5: 15: 0.8) was used at a concentration of 20% by weight. It was dissolved in an acetone solvent, applied to A4 size plain paper with a wire bar, and dried to form a transparent resin layer having a thickness of 40 μm.

Next, on the same resin as above, aluminum oxide (average particle diameter of primary particles of 20%) produced by a flame hydrolysis method was used.
nm, BET specific surface area: 100 m ² / g, chemical purity: 99.6
%, Crystal structure: delta structure) An inorganic oxide fine particle layer having a layer thickness of 5 μm is formed on the surface of the transparent resin layer in the same manner as in the above transparent resin layer except that 4% by weight is added to obtain a transfer body of the present invention. Was.

<Preparation of Developer> 100 parts by weight of polyester resin, colorant (BK toner; 10 parts by weight of carbon black, Y toner; 5 parts by weight of benzidine yellow, M toner;
Rhodamine B 5 parts by weight, C toner; Copper phthalocyanine 5
Parts by weight) and 3 parts by weight of polypropylene were melt-kneaded, pulverized and classified to prepare four types of full-color toners each having an average particle size of 8 μm. Each color toner 5
Spherical ferrite carrier coated with parts by weight and styrene-methyl methacrylate copolymer (volume average particle size 60 μm)
By mixing 95 parts by weight, four types of color developers were obtained.

<Image Forming Test> Using this developer, a color image was formed 10,000 times by the color image forming apparatus shown in FIG. 3 having the belt-shaped fixing device shown in FIG.

(1) Glossiness: Measured at a measurement angle of 75 ° by “UGS-300A Reformed Glossmeter” (manufactured by Nippon Denshoku Industries Co., Ltd.). (2) Image Disturbance: In Transferred Image (3) Image stain: Evaluated by image stain due to re-transfer of toner adhered to the fixing member to an image after fixing, (3) Image stain: Evaluated by white image omission or image disorder due to poor transfer. 4) Storage property: The formed color images are superposed face to face, a load of 0.5 g / cm ² is applied thereto, left for 1 day in an environment of a temperature of 40 ° C. and a relative humidity of 80%, and then separated. To evaluate the transfer status of the image.

The results are shown in the following table. The obtained image had no transfer failure, no transfer to the belt-shaped member, and had high gloss and excellent image quality with no loss of image.

Example 2 Titanium oxide (average particle size of primary particles 21 n) produced by a flame hydrolysis method in place of aluminum oxide in Example 1
m, BET specific surface area: 50 m ² / g, chemical purity: 99.5%, crystal structure: 70%, anatase structure was used. The obtained image had no transfer failure, no transfer to the belt-shaped member, and had high gloss and excellent image quality with no loss of image.
Further, the discoloration of the transfer body image was observed by irradiating ultraviolet rays for one day, but no discoloration occurred.

Example 3 The results are shown in the following table in the same manner as in Example 1 except that 2% by weight of aluminum oxide was added. The obtained image had no transfer failure, no transfer to the belt-shaped member, and had high gloss and excellent image quality with no loss of image.

Example 4 The results are shown in the following table in the same manner as in Example 1 except that the thickness of the transparent resin in Example 1 was changed to 30 μm. The obtained image had no transfer failure, no transfer to the belt-shaped member, and had high gloss and excellent image quality with no loss of image.

Comparative Example 1 The same as Example 1 except that the transfer member of Example 1 having only the transparent resin layer without forming the inorganic fine particle layer was used and the fixing device of FIG. 2 was replaced with a heat roller fixing device. I made it. The results are shown in the table below.

[0062]

[Table 1]

[0063]

As is apparent from the above description, the present invention
According to the color image forming method, an effect that excellent color image storability are obtained in high quality with a gloss occurrence of image disturbance is excellent not are obtained.

[Brief description of the drawings]

FIG. 1A is an explanatory view showing a light reflection state when a transparent resin layer is not provided, and FIG. 1B is an explanatory view showing a light reflection state when a transparent resin layer is provided.

FIG. 2 is a cross-sectional view illustrating an example of a fixing device that can be suitably used in the present invention.

FIG. 3 is a cross-sectional view of the color image forming apparatus used in the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transfer body 2A color toner image 2B transparent resin layer 3 heating roll 4 core 5 elastic layer 6 heat source 7 pressure roll 8a heat resistant belt 8b heat resistant belt 9 peeling roll 10 pressure roll 11 separation claw 12 forced cooling device 20 document 21 document table 22 Carriage 23 Movable mirror unit 24 Halogen lamp 30 Lens 33 Color CCD 34 Image processing device 41 Motor 42 Polygon mirror 43 fθ lens 45A Pre-exposure lamp 45B Scorotron charger 46Y Yellow developing unit 46M Magenta developing unit 46C Cyan developing unit 46BK Black developing unit 47 Transfer unit 48 Separator 49 Cleaning unit 55 Fixing unit PA Color image transfer body PB Color image transfer body K Image reading unit L Laser writing unit M Image forming unit N Feeding unit

Continuation of the front page (56) References JP-A-63-33749 (JP, A) JP-A-2-127656 (JP, A) JP-A-3-278080 (JP, A) JP-A-2-294674 (JP) JP-A-2-46474 (JP, A) JP-A-4-125567 (JP, A) JP-A-5-173351 (JP, A) JP-A-5-88400 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03G 7/00 G03G 15/00

Claims (4)

(57) [Claims] 1. A photoconductor comprising three or more types of color toners.
Transfer the formed color toner image onto the color image transfer
Copying and fusing the color toner image on the color image transfer body.
In a color image forming method in which the color
The image transfer body is made of thermoplastic styrene based on the surface of the transfer body.
Equipped with a transparent resin layer of resin thickness of 20 to 200 μm
Further, the surface of the transparent resin layer is manufactured by a flame hydrolysis method.
The produced inorganic oxide fine particles contain 1.0 to 5.0% by weight.
Inorganic oxidation with a layer thickness of 1 to 10 μm with a large amount dispersed and contained
Having a fine particle surface layer, and the color toner is a polyester.
The resin contains 50% by weight or more of the binder resin component.
A color image forming method. 2. The method according to claim 1 , wherein three or more types of color toners are provided on the photosensitive member.
Transfer the formed color toner image onto the color image transfer
Copying and fusing the color toner image on the color image transfer body.
In a color image forming method in which the color
The image transfer body is made of thermoplastic styrene based on the surface of the transfer body.
Equipped with a transparent resin layer of resin thickness of 20 to 200 μm
Further, the surface of the transparent resin layer is manufactured by a flame hydrolysis method.
The produced inorganic oxide fine particles contain 1.0 to 5.0% by weight.
Inorganic oxidation with a layer thickness of 1 to 10 μm with a large amount dispersed and contained
Having a fine particle surface layer, and the color toner is a polyester.
Content of the binder resin is 50% by weight or more of the binder resin component.
And transferring the color toner image to the color image transfer body.
Melted and fixed by belt-shaped heating and conveyor on top
A color image forming method. 3. The method according to claim 1, wherein the inorganic oxide fine particles are alumina fine particles.
The color according to claim 1 or 2, wherein
Image forming method. 4. The method according to claim 1, wherein the inorganic oxide fine particles are titanium oxide fine particles.
The color image forming method according to claim 1, wherein the color image is a child .