JP3148947B2 - 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 through a filter such as ND (neutral) or the like, and these electrostatic latent images for each color are Y (yellow), M ( The color toner images of each color are formed by sequentially developing with color toners such as magenta), C (cyan) and, if necessary, BK (black). Next, the color toner images of the respective colors are superimposed and formed on the photoreceptor and then collectively transferred to a transfer body, or the color toner images of the respective colors are formed on the photoreceptor each time the color toner images are formed on the photoreceptor. And superimposed on the transfer body. Thereafter, the superposed color toner image on the transfer member is heated and fixed by a heating and pressure roller to form a color image.

A color toner used in such an electrophotographic method is composed of particles formed by dispersing a dye or a pigment in a thermoplastic resin, and has an average particle diameter of 5 to 20 μm.
m. For this reason, as described in JP-A-63-92965, a color toner image is formed of one to four toner particle layers, and the color toner image after fixing also has irregularities in the surface vertical direction. It becomes that having. A color image having unevenness by such an electrophotographic method has poor color reproducibility and glossiness as compared with ordinary photographs and printing, and as a result, is inferior in color image quality.

In order to improve the image quality of such a color image, for example, Japanese Patent Application Laid-Open No. 63-92965 discloses a method in which a transparent resin layer is formed on an image supporting base material, and the transparent resin layer is formed on the transparent resin layer. Attempts have been made to improve by embedding toner particles with a heated roller.

[0005]

However, as a result of the inventor's intensive studies, the above-mentioned technique can provide a color image having a certain degree of gloss and good image quality. The resin that forms the transparent resin layer is an acrylic resin having a softening point of 60 to 70 ° C. and is brittle, so that the transparent resin layer is easily cracked by long-term storage or bending. The occurrence of cracks causes white streaks in the color image and lowers the quality of the color image.

It is conceivable to use a tough resin in order to eliminate the brittleness as described above. However, in a heat fixing method using only a roller, the time required for heating and release from the mold is very short, so that a tough resin is used. When resin is used, it is difficult to melt the toner, so the toner does not completely melt and is in a rubber-like elastic body, and even if it is elastically deformed to some extent by the pressure of the roller and becomes smooth, if the pressure is released In addition, the toner particles are easily relaxed to the original state, and the uneven toner particles are in a raised state.

[0007]

THE INVENTION The object of the 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 .

[0008] Still another object of the present invention is to prevent cracks from occurring.
Because it provides a color image with good storability that does not produce
To provide a color image forming method.

[0009]

An object of the present invention is to form a color toner image formed by three or more color toners.
Color image forming method for fusing and fixing on image transfer body
In the above, the image transfer body has a styrene component and a butadiene
Styrene having a weight ratio of the ene component of 95: 5 to 60:40.
Styrene emissions containing butadiene copolymer - comprises a transparent resin layer made of acrylic resin, and a color toner
Is a polyester resin binder as the binder resin
A resin characterized by containing at least 50% by weight of the resin component.
Image forming method, and a color image forming method in which a toner image formed by three or more color toners is melted and fixed on an image transfer body, wherein the image transfer body contains a styrene-butadiene copolymer on the surface. Styrene-
This is achieved by a color image forming method comprising: providing a transparent resin layer made of an acrylic resin; and melting and fixing the toner image on the image transfer member by a belt-like heating and conveying member. You.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail.

In the color image transfer body of the present invention, the resin as a transparent resin layer provided on the surface of the color image transfer body is made of a styrene-acrylic resin containing a styrene-butadiene copolymer. The butadiene polymer portion copolymerized in the styrene-acrylic resin is in a micro-dispersed form, and when a shock causing cracks is applied, the impact energy is absorbed by the soft butadiene polymer portion. As a result, the occurrence of cracks is prevented. Here, the butadiene component is copolymerized with styrene because the styrene-acryl resin and the butadiene resin have poor compatibility and are chemically bonded to each other to improve the dispersibility of both resins. This is for dispersion. As the type of the styrene-butadiene copolymer, a random type is effective, but a graft type or a block type is preferable. In order to prevent cracks from occurring, it is effective to make the styrene resin itself tough. For this purpose, it is necessary to relatively increase the molecular weight of the styrene-acryl resin in which the styrene-butadiene copolymer is dispersed. Just fine. However, if the molecular weight is relatively large, the softening point becomes too high and the meltability is impaired, so that the acrylic component is copolymerized to impart the meltability. In the resin designed in this way, the film forming ability required for forming the resin layer is also good because the molecular weight is relatively large, and no crack is generated during drying even when dissolved and applied in a solvent. A good transparent resin layer can be formed.

The molecular weight of the styrene-acrylic resin is preferably from 50,000 to 1,000,000, more preferably from 80,000 to 500,000 in order to impart toughness.

The method for producing the styrene-butadiene copolymer used in the present invention includes a method of copolymerizing a styrene monomer and a butadiene monomer, a 1,2-butadiene polymer or a 1,4-butadiene polymer. Examples of the method include graft copolymerization using a styrene-based monomer for the coalescence, and block copolymerization of a 1,2-butadiene polymer or a 1,4-butadiene polymer and a styrene-based polymer. The copolymerization weight ratio of the styrene-butadiene copolymer is such that the styrene component: butadiene component is 95: 5 to 60:40.

The above polymer is prepared by an emulsion polymerization method, a suspension polymerization method,
It can be produced by a known polymerization method such as a bulk polymerization method.

In order to obtain a styrene-acrylic resin containing the styrene-butadiene copolymer of the present invention, the styrene-butadiene copolymer is added to a monomer composed of a styrene monomer and an acrylic monomer. After dissolving and dispersing, it can be produced by a known polymerization method such as an emulsion polymerization method, a suspension polymerization method, or a bulk polymerization method.

The monomers used include styrene monomers such as styrene, chlorostyrene and methylstyrene, and methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, dodecyl acrylate, and the like. Lauryl acrylate, 2-ethylhexyl acrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, dodecyl methacrylate, lauryl methacrylate, methacrylic acid-2 -Acrylic monomers such as -ethylhexyl, dimethylaminoethyl methacrylate, and diethylaminoethyl methacrylate. Furthermore, in order to make it crosslinkable, divinylbenzene, diethylene glycol dimethacrylate, a crosslinkable monomer such as triethylene glycol trimethacrylate is 0.1 to 0.1
To use 5.0% by weight or adjust the molecular weight, use a chain transfer agent such as α-methylstyrene, dodecylmercaptan, etc.
You may use below weight%.

As the transfer member for forming the transparent resin layer of the color image transfer member in the present invention, paper, plastic or the like is used.

The transparent resin layer of the color image transfer member according to the present invention may have a thickness of 5 to 80 μm, preferably, on the surface of the transfer member.
The thickness of 10 to 50 μm is preferable for providing a high-quality image. When the thickness of the transparent resin layer is less than 5 μm, when the color toner image is melted and fixed, the image is not sufficiently embedded in the transparent resin layer, resulting in an image having many irregularities and lacking in glossiness. On the other hand, when the thickness of the transparent resin layer exceeds 80 μm, the color toner image and the transparent resin layer are easily transferred to the belt, resulting in a defective image with poor image quality due to missing images and surface irregularities. Would.

The transparent resin layer is formed by dissolving the resin in a solvent such as toluene, acetone, ethyl alcohol, methyl ethyl ketone, tetrahydrofuran, etc., coating the solution on a transfer member and drying to form a color image transfer member of the present invention. You.

In the color image forming method of the present invention, a good effect is exhibited by using a color image transfer member composed of the above-mentioned specific styrene-based resin and fixing in a fixing step with a belt-shaped heating member. When fixed with a conventional roller-type heating element, the styrene-based resin in the transparent resin layer is insufficiently melted, making it difficult for toner particles to be embedded. In addition, the adhesion of the image to the heating element raises the image and causes the image to be lost. Resulting in.

The softening point Tsp (t) of the color toner of the present invention
Is preferably 90 to 140 ° C. so that the color toners of each color are sufficiently mixed in a molten state, and the softening point Tsp (p) of the resin of the transfer body is set so as not to mix with the transparent resin layer in the molten state. ), More preferably at least 5-30 ° C. The softening point of the transparent resin is preferably from 105 to 150 ° C.

That is, Tsp (t) <Tsp (p), 90 ° C. <Tsp
(T) <140 ° C., preferably Tsp (p) −
It is preferable that 5 <Tsp (t) <Tsp (p) -30.

The color developer used in the present invention is preferably a two-component color toner composed of a non-magnetic color toner and a magnetic carrier from the viewpoint of improving fluidity, triboelectricity, developability, image reproducibility and the like. Color developers are preferably used.

The non-magnetic color toner can be obtained by mixing colored resin particles composed of a binder resin, a colorant, if necessary, a charge controlling agent and other property improving agents, and if necessary, inorganic oxide fine particles. .

As the binder resin of the color toner according to the present invention , styrene-acrylic resin, styrene-
Butadiene resin, polyester resin and the like can be mentioned, but the color toner of the present invention improves the incompatibility with the transparent resin layer of the image transfer body and gives the spread of the image after fixing and the sharpness of the boundary region. For the binder resin composition
Min over 50 wt% composed of a polyester resin.

As the colorant, carbon black, cyan toner, phthalocyanine blue, yellow toner, benzidine yellow, quinoline yellow, chromophthal yellow, magenta toner, chromophthal red, PV fast red, etc. Can be used.

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, and the like can be used.

As the other property improving agent, a wax having a melting point of 60 to 160 ° C. such as paraffin wax, polyethylene wax or polypropylene wax can be used in an amount of 10 parts by weight or less based on 100 parts by weight of the binder resin.

As the inorganic oxide fine particles, 5% or less of silica, titanium oxide, or the like, which has been subjected to a hydrophobic treatment with a silane coupling agent, can be added to and mixed with 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, a color toner image formed on a photoreceptor formed by, for example, an electrophotographic method is transferred to a transfer body, and heated, melted and fixed to form a color image. A specific transparent resin layer is provided as a transfer body, and a color toner image is fixed by a belt-shaped heating body so as to be embedded in the transparent resin layer to form a color image.

According to this configuration, the heating time is heated during the conveyance by the belt, so that the heating is performed for a much longer time than in the roller method, and the transparent resin layer is sufficiently melted. The toner particles are easily embedded, and the toner particles are also in a fluid state and are permanently deformed. Further, even at the time of releasing, since the releasability of the belt-shaped heating body, the transfer body, and the toner image is good, the image is not lost due to the floating or transfer of the toner image.
For this reason, the obtained color image is excellent in glossiness by preventing irregular reflection of illumination light, high in quality without adhering the image to the heating body, and can have good storage stability.

[0033]

FIG. 1 (a) shows a light reflection state when a transparent resin layer is not provided on a color image transfer member, and FIG. 1 (b) shows a fixing color having a transparent resin layer. The light reflection state of the color image transfer body of the present invention in which a toner image is embedded in the transparent resin layer is shown. In FIG. 1, 1 is a transfer paper made of plain paper, 2A is a fixed color toner image, 2B
Is a transparent resin layer.

As is apparent 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 color has good gloss because of good reflectivity. An image is obtained.

FIG. 2 shows a fixing device used in the color image forming method of the present invention. By the belt-shaped transporting body that moves under the member containing the heat source, the color toner adhered on 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, and the belt is further fixed. The color carrier can be separated from the transfer body to form a color image.

In FIG. 2, 1 is a transfer member, 2A 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 is provided with an elastic layer 5 of rubber or the like on the outer periphery of a core fixed to a transfer 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 2A is heated and conveyed by heat-resistant belts 8a and 8b moving under a member having a heat source 6.
The color toner image on the transfer body 1 is melted and fixed, and is cooled by natural air cooling or forced cooling device 17 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,
An image is exposed on the photoreceptor to form an electrostatic latent image for each color, and the latent image is developed by superimposing with yellow (Y), magenta (M), cyan (C) and black (BK) toners. A color toner image is formed, and the superimposed color toner images are collectively transferred onto the transfer body of the present invention, and are heated and 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 paper 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 photoreceptor 40, a pre-exposure lamp 45A, a scorotron charger 45B, a negative toner of Y, M, C and BK to which an AC bias P1 and a DC bias P2 are applied. Developing units 46Y, 46M, 46C, and 46BK filled with a developer containing, and a transfer unit that collectively transfers a color toner image formed on the organic photoreceptor 40 to a transfer body
47, a separator 48, and a fixing unit 55 for fixing a color toner image.
And a cleaning device 49 for removing toner remaining on the organic photoconductor 40. The details of the fixing device 55 are 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, an initialization signal is output to the image reading section K via the control circuit, and the document 20 on the document table 21 of the image reading section K is illuminated by the halogen lamp 24 of the carriage 22. The mirror group 25, 2 that scans and is driven by a stepping motor
Scanning is performed by 6 and 27, and the light image of the original is
An image is formed on the light receiving surface of the color CCD 33 through 0 and converted into an electric signal. The image signal converted into the electric signal is subjected to signal processing such as A / D conversion, shading correction, gradation correction, color conversion, ghost processing, and multi-value processing in the image processing device 34, and the processed document is processed. The image data is once stored in the image memory and then sequentially input to the laser writing unit L as each color signal.

In the laser writing section L, a laser beam generated by a semiconductor laser (not shown) is driven by a drive motor 41.
The light is rotated and scanned by a polygon mirror 42 rotated by an optical scanner 45, and the optical path is bent by a mirror 44 via an fθ lens 43 to form a bright line on the peripheral surface of the photosensitive drum 40 to which electric charges are previously applied by a charger 45B.

On the other hand, when the scanning is started, the beam is detected by the index sensor, the modulation of the beam by the first color signal is started, and the modulated beam scans the peripheral surface of the photosensitive drum 40. Therefore, a latent image corresponding to the first color is formed on the peripheral surface of the photosensitive drum 40 by the main scanning by the laser beam and the sub-scanning by the conveyance of the photosensitive drum 40. This latent image is yellow (Y) of the developing means.
Is reversely developed in a non-contact state by the developing device 46Y loaded with the toner (visualizing medium) to form a toner image on the drum surface. The obtained toner image passes under the cleaning device 49 as cleaning means separated from the peripheral surface of the photosensitive drum 40 while being held on the drum surface, and enters a next copy cycle.

That is, the photosensitive drum 40 is connected to the charger 45.
B, and then the second color signal output from the image processing device 34 is input to the writing section L, and writing to the drum surface is performed in the same manner as in the case of the first color signal described above. A latent image is formed. The latent image is reversely developed in a non-contact state by a developing unit 46M loaded with magenta (M) toner as the second color.

The magenta (M) toner image is formed in the presence of the yellow (Y) toner image already formed.

Reference numeral 46C denotes a developing unit having cyan (C) toner, and forms a cyan (C) toner image on the drum surface based on a control signal generated by a signal processing unit.

Reference numeral 46BK denotes a developing unit having a black toner, and a black toner image is formed on the surface of the drum by superposition by the same processing. These developing units 46Y, 46
A DC or further AC bias is applied to each of the sleeves M, 46C, and 46BK, and jumping development is performed by a one-component or two-component developer as a visualization means. Reversal development is performed by contact.

The color toner image formed on the peripheral surface by the four rotations of the photosensitive drum 40 is fed from the cassette 50A to the roller 51A at the same time as the image formation.
The sheet is conveyed to the transfer area via the timing roller 52 and is transferred onto the specific transfer member PA of the present invention at once by the operation of the transfer device 47.

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.

On the other hand, the photosensitive drum 40 from which the transfer member PA is separated
In the fifth cycle, the residual toner is removed and cleaned by receiving the pressure contact of the blade of the cleaning device 49, and then the next image is formed.

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> A monomer comprising 20 parts by weight of a styrene-butadiene block copolymer (weight composition: 80:20) consisting of 65 parts by weight of styrene and 15 parts by weight of n-butyl acrylate After dissolving and dissolving in the solution, polyvinyl alcohol was used as a dispersion stabilizer for suspension polymerization to obtain "resin A of the present invention". This “resin A of the present invention” has a weight average molecular weight of 260,000,
The softening point was 128 ° C. This “resin A of the present invention” is
It was dissolved in acetone solvent at a concentration of weight%, applied to A4 size plain paper with a wire bar, and dried,
"Transfer A of the present invention" having a transparent resin layer having a thickness of

<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: 5 parts by weight of rhodamine B, 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 10 μm. The softening points of this toner were 113 ° C. (BK toner), 110 ° C. (Y toner), 11 ° C.
1 ° C. (M toner) and 110 ° C. (C toner). By mixing 5 parts by weight of each color toner and 95 parts by weight of a spherical ferrite carrier coated with a styrene-methyl methacrylate copolymer, four types of color developers were obtained.

Using this developer, a color image was formed on the transfer paper A of the present invention by the color image forming apparatus of FIG. 3 provided with the belt-shaped fixing device of FIG.

The obtained image had a high image quality without any transfer to the belt and no image loss, and had a glossiness of 80%. In addition, glossiness is "UGS-300A variable angle photometer"
It was measured at a measuring angle of 75 degrees by [Nippon Denshoku Industries Co., Ltd.].

Next, the formed color image was subjected to 20 ° C., 20%
The storage stability test was performed by leaving the system under the RH environment for 10 days.
As a result, the storage stability was good without generating cracks.

Example 2 The procedure of Example 1 was repeated except that the weight average molecular weight of the “resin A of the present invention” was 260,000 and the softening point was 128 ° C., and the weight average molecular weight was 210,000 and the softening point was 120 ° C. "Transfer paper B of the present invention" was obtained.

A color image was formed in the same manner as in Example 1 except that the “transfer paper B of the present invention” was used.

The obtained image was of high image quality with no transfer to the belt and no image loss, and had a glossiness of 83%.

Next, the formed color image was subjected to 20 ° C., 20%
The storage stability test was performed by leaving the system under the RH environment for 10 days.
As a result, the storage stability was good without generating cracks.

Comparative Example 1 The same procedure as in Example 1 was carried out except that a methyl methacrylate-butyl acrylate copolymer having a softening point of 70 ° C. was used as a resin for the transfer member, and a heat roller fixing device was used as a fixing device. . As a result, a part of the obtained image was transferred to the heating belt, the image was missing, and the glossiness was 35%, which was poor in image quality. In addition, a number of cracks occurred in the preservation test.

[0067]

As is apparent from the above description, the present invention
According to the color image forming method, the effect of a color image a crack is excellent in storage stability at a high quality with excellent glossiness does not occur is obtained 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 particle layer 3 heating roll 4 core 5 elastic layer 6 heat source 7 pressure roll 8a upper heat resistant belt 8b lower 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 unit PB Color image transfer unit K Image reading unit L Laser writing unit M Image forming unit N Feeding unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-6019 (JP, A) JP-A-4-212168 (JP, A) JP-A-3-38650 (JP, A) JP-A-4- 359258 (JP, A) JP-A-63-92965 (JP, A) JP-A-2-294674 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 7/00 G03G 15 / 00

Claims (3)

(57) [Claims] Claims: 1. An image forming apparatus comprising three or more types of color toners.
Color toner image fused on the image transfer body and fixed
In the color image forming method, the image transfer body has a surface
The weight ratio of the styrene component and the butadiene component is 95: 5
Contains 60:40 styrene-butadiene copolymer
With a transparent resin layer made of styrene-acrylic resin
And color toner is polyether as binder resin.
Contains stell resin at 50% by weight or more of binder resin component
A color image forming method. 2. A color image forming method in which a toner image formed by three or more kinds of color toners is melted and fixed on an image transfer body, wherein the image transfer body contains a styrene-butadiene copolymer on the surface. A color image forming method comprising: a transparent resin layer made of a styrene-acrylic resin; and melting and fixing the toner image on the image transfer member by a belt-shaped heating and conveying member. 3. A copolymer of the styrene-butadiene copolymer.
The weight ratio of the titanium component to the butadiene component is 95: 5 to 6
0:40, and the color toner is
50% by weight of polyester resin as binder resin component
% Or more.
Color image forming method.