JPH03213876A - Toner for full color development - Google Patents

Abstract

PURPOSE:To obtain the color toner having excellent light transmittability by kneading coloring agent until a specific state is attained so that the coloring agents are uniformly dispersed to a prescribed fine particular state. CONSTITUTION:The toner is formed to 0.9 mum thickness to disperse the dispersed coloring agent particles having the size of 10 to 12.5 mum<2> area occupied by the coloring agent for magenta dispersed in 780000 mum<2> area of the forming surface at <=40 pieces and the dispersed coloring agent particles having the size of 12.5 to 15.0 mum<2> at <=20 pieces. The presence of 10 to 12.5 mum<2> particles and 12.5 to 15.0 mum<2> particles in the dispersed coloring agent particles in the resin is limited to the specified quantity in such a manner, by which the toner having excellent light transmittability in the visible part exclusive of the wavelength absorption region possessed by the coloring agents is obtd.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a full-color developing toner in which various types of toner are used in a superimposed manner on an image on a transfer paper. The present invention relates to toners that can have substantially the same development characteristics and transfer characteristics.

The present invention also includes: Among full-color developing toners, this refers to magenta, cyan, and yellow toners, and more specifically, when these toners are mixed on an image on transfer paper, each toner clearly displays the desired color. The present invention relates to a toner having sufficient transparency to develop color.

(Prior Art and Problems to be Solved by the Invention) In the fields of electrophotography and electrostatic printing, toner is used to visualize an electrostatic latent image formed on an image carrier. There is.

In this toner, various resins such as styrene resin and polyester resin are used as the resin medium, and the coloring agent is carbon black or other organic resin. Alternatively, inorganic coloring raw materials are used.

Further, recently, full-color development has been carried out in which magenta, cyan, yellow, and blank color toners are superimposed to form an image.

Full-color development involves exposing a multicolor document to light using color separation filters, repeating this process multiple times using cyan, yellow, and magenta color developers and black toner, and superimposing the toner images to create a multicolor image. The purpose is to obtain a color image. In toners used for such full color development, organic pigments are used as colorants for cyan, yellow, and magenta toners.
Carbon black is used as the black toner.

FIG. 7 is a diagram showing a developing section and a transfer section of an image forming apparatus for obtaining a full-color image, and the electrostatic latent image formed on the photosensitive drum 1 by an appropriate means is transferred to the developing device 3a of the developing unit 2, which moves up and down. , 3b+, 3c, and 3d, and is transferred by the transfer charger 5 onto a transfer material held on the transfer drum 4 by the gripper 6 and neutralized by the charger 7. Furthermore, 3a and 3b, which are different from the first color, are used as the second color.
, 3c.

The toner image developed by the developer of any of the developing devices 3d is also transferred to the transfer material by the transfer charger, and
The color and the fourth color are also applied in the same manner. In this way, toner images of a predetermined number of colors are multiple-transferred onto the transfer material held on the transfer drum 4, and the transfer material is conveyed to a fixing step (not shown) to obtain a full-color image. Generally, in the above-mentioned transfer process, toner of a different color is further transferred onto the toner layer transferred onto the transfer material. In this operation, the electric charge of the toner already transferred onto the transfer material may lower the effective transfer electric field in the next toner transfer operation, so that an image with a desired hue may not be reproduced. For this reason, a method is sometimes taken in which the transfer voltage is increased sequentially or after the third time when the toner layer becomes thicker in the transfer process.

However, the behavior of toner in the actual transfer process is delicate, and even if a predetermined transfer voltage is applied and the voltage value of the transfer voltage is further increased in the subsequent process, the retention of each color toner (charging characteristics, electrical characteristics) Due to the difference in color, toner scattering often causes transfer defects, and it is not possible to obtain a satisfactory result in obtaining a toner image of the desired color.

Furthermore, as described in Japanese Patent Publication No. 1-32981, the charge of the toner to be developed and transferred is made larger than the absolute value of the charge amount of the toner that has already been developed and transferred to compensate for the decrease in the actual transfer electric field. A method for stabilizing the transfer process has also been proposed, but in this method, the development conditions for each color (photoconductor charging characteristics, development bias, photoconductor -
If you try to standardize the developer carrier (sliding condition), the charging characteristics of the toner will be significantly different, resulting in uneven developability (insufficient density in solid areas, thickening of line and dot images, toner dust around the periphery of image areas). This may cause toner to scatter inside the machine, resulting in hue shifts, blurred images, etc.

In addition, color toners must not only have excellent spectral reflection properties but also sufficient spectral transmittance to obtain an image with the same hue as the original color, and there are multiple types of color toners. When producing full-color images by overlapping toner, it is especially important to have toner transparency.

When color toners with poor transparency are used, the toner colors often interfere with each other, resulting in a darkened image, making it impossible to obtain a desired colored image.

Attempts to improve this problem include, for example, proposals to select a specific fluorine-containing acrylic resin as a binding resin medium (Japanese Patent Laid-Open No. 62-2735).
69) proposed the inclusion of oil-soluble dyes such as C,1 and Solvent Yellow 60 in yellow toners (Japanese Patent Laid-Open No. 62-27357).
2).

However, none of these methods is sufficient to vividly reproduce the original image tone when mixing colors, and the problem often arises that the image becomes unclear and the characteristics of the colors are not utilized, and they are far from a fundamental solution.

Therefore, an object of the present invention is to provide a full-color developing toner having extremely high light transmittance.

Another object of the present invention is to provide a full-color developing toner that can clearly exhibit the color tone of each toner that is superimposed upon color mixing by increasing the light transmittance of the toner itself.

A further object of the present invention is to provide magenta, cyan, and yellow toners among full-color developing toners.

Another object of the present invention is to provide a full-color developing toner that can reduce the difference in electrical properties of the toners to be superimposed and make the development characteristics and transfer characteristics of each toner almost the same.

Another object of the present invention is to provide a toner that can perform full-color development with excellent reproducibility without a decrease in saturation or density unevenness in one image by equalizing the development characteristics and transfer characteristics.

(Means for Solving the Problems) According to the present invention, there is provided a toner in which a magenta colorant is dispersed in the form of particles in a binder resin, the M) toner having a thickness of 0.5 mm.
The area occupied by the magenta coloring agent formed to have a thickness of 9 μm and dispersed in the area of 780000 μm2 of the formed surface is:
40 or less dispersed colorant particles having a size of 10 to 12.5 μm2, and 20 or less dispersed colorant particles having a size of 12.5 to 15.0 μm2. A full-color developing toner with excellent transparency is provided.

In the full color developing toner, the binder resin has an electrical conductivity of 1.0X10'' to 5.OX10-9 (s
/c) can be characterized by satisfying the range.

Further, the full color developing toner may be characterized in that the melting temperature of the binder resin is in the range of 80 to 130°C.

Further, the full color developing toner may be characterized in that the colorant is a quinacridone pigment.

The present invention also provides a toner in which a cyan colorant is dispersed as particles in a binder resin, the toner having a thickness of 0.
, 9 μm, and the area of the formed surface is 780,000 μm2.
The area occupied by the cyan colorant dispersed in the
It is characterized by having 80 or less dispersed colorant particles having a size of 10 to 12.5 μm2, and 50 or less dispersed colorant particles having a size of 12.5 to 15.0 μm2. A full-color developing toner with excellent transparency is provided.

According to the present invention, there is further provided a toner in which a yellow coloring agent is dispersed as particles in a binder resin, wherein the toner is formed to a thickness of 0.9 μm, and the area of the formed surface is 780,000 μm.
The area occupied by the yellow colorant dispersed in 1' is 15 or less dispersed colorant particles having a size of 10 to 12.5 μm2, and 12°5 to 15.0 μm2.
Provided is a full-color developing toner with excellent transparency, characterized in that 10 or less dispersed colorant particles having a size of m2 are dispersed.

(Function) Factors that affect the transparency of toner include the properties of the binder resin itself, such as optical properties such as spectral reflection and spectral transmittance, and uniformity of shape. Little attention has been paid to the fact that the specific state of dispersion in the binder resin has a particularly large effect on the transparency of the toner. The present inventors have investigated this dispersion state, which has not received much attention, and as a result of extensive research, they have arrived at the present invention.

That is, when kneading the binder resin and the colorant, the present inventors knead the colorant until it reaches a specific state,
It was discovered that by uniformly dispersing the colorant in the form of predetermined fine particles, a color toner with excellent light transmittance in the visible region, which is not found in conventional toners, can be obtained. .

Then, we investigated the preferred dispersion state and amount of each colorant in full-color developing toners used in combination, particularly magenta, cyan, and yellow toners, and arrived at the present invention.

Conventionally, organic colorants have a primary particle size of 0.1 when manufactured.
However, because they tend to aggregate during drying, the secondary particle size has a wide range of agglomerated particle sizes ranging from several μm to several hundred μm, and conventional toners do not use colorants with such particle sizes. were mainly dispersed in the resin.

However, in the toner of the present invention, particles of 10 to 12,5μ+l12 of the dispersed colorant particles in the resin and 1
The presence of particles of 2.5 to 15.0 μm2 is limited to a certain amount or less. These existence-restricted particles mainly correspond to secondary particles, and a toner subjected to such restrictions has excellent light transmittance in the visible region, except for the wavelength absorption region of the colorant.

In addition, the present inventors have found that 10 to 12.5 μm2 in the resin.
It has also been found that the number of colorant particles of 12.5 to 15.5 μm 2 is different for magenta, cyan, and yellow toners, respectively.

Figure 1 shows an investigation of the transmittance T% of the absorption wavelength in the visible region of a toner using a conventional magenta colorant.
FIG. 2 shows an investigation of the transmittance T% of the absorption wavelength in the visible region of a toner in which the magenta colorant according to the present invention is suitably dispersed in a resin. As shown in FIGS. 1 and 2, each magenta toner has a particle size of 500 to 600 nm.
It has almost the same absorption value around the wavelength of . On the other hand, it can be seen that in other visible wavelength regions (500 nm or less and 600 nm or more), it does not absorb light and is transparent. It is also understood that conventional toners have poor light transmittance in this region.

On the other hand, the magenta toner according to the present invention has the same effect in the absorption wavelength range of the original colorant as the conventional one, and has excellent light transmittance in other visible regions. Therefore, the toner according to the present invention is suitable for use as a full-color developing toner, and provides images with excellent reproducibility.

Further, a toner was formed as a measurement sample to a thickness of 0.9 μm, and the area occupied by the magenta colorant dispersed in the area of 780,000 μm 2 of the formed surface was 10 to 12.
The number of dispersed colorant particles having a size of 5 μm2 is not more than 40, especially not more than 30, and the size is 12.5 to 15°0 μ12
20 dispersed colorant particles having a size of 20 or less, especially 1
It is also important for the magenta toner that the particles are dispersed and formed in a number of 0 or less. In the case of a magenta toner, if the number of colorant particles is below the above range, sufficient light transmittance can be obtained in the toner, but if the number is above the above range, the light transmittance becomes poor. . Although it is unclear why the transparency of the toner is improved by restricting the presence of such large-diameter colorant particles, many colorant particles with a primary particle size are present in the binder resin.

It is thought that these are uniformly dispersed and a resin polymer film is wetted and adhered to the entire surface.

Further, in the magenta toner, it is preferable to use a quinacridone pigment as a coloring agent.

The quinacridone pigment has dispersibility in the resin, and can satisfy the limited number range within the above particle size range. As described above, the quinacridone pigment has dispersibility in the binder resin, and toners using it have uniform electrical properties and excellent light transmittance and spectral properties.

Figure lff3 shows the transmittance T% of the absorption wavelength in the visible region of a toner using a conventional cyan colorant, and Figure 4 shows that the cyan colorant according to the present invention is suitable for use in resin. The transmittance T% of the absorption wavelength in the visible region of the toner dispersed in the toner used was investigated. As shown in Fig. 3 and Fig. 14, each cyan toner has 600 to 700 r+m
They have almost the same absorption values in the wavelength range of . on the other hand,
It can be seen that in the wavelength region around 500 rv, it does not absorb light and has light transmittance. It is also understood that conventional toners have poor light transmittance in this region. On the other hand, the cyan toner according to the present invention has the same effect in the wavelength range of the original colorant as the conventional one, and has excellent light transmittance in other visible regions. Therefore, the toner according to the present invention is suitable for use as a full-color developing toner, and provides images with excellent reproducibility.

Further, the toner is formed to have a thickness of 0.9 μm, and the cyan colorant dispersed within the area of the formed surface of 780,000 μm12 has a size of 10 to 12.5 μm2. It is also important for the cyan toner that the number of dispersed colorant particles is 80 or less, especially 70 or less, and the number of dispersed colorant particles having a size of 12.5 to 15,0 μm2 is 50 or less, especially 40 or less. It is.

In the case of cyan toner, if the number of colorant particles is below the above range, sufficient light transmittance can be obtained in the toner, but if the number is above the above range, the light transmittance becomes poor.

Further, in the cyan toner, it is preferable to use a copper phthalocyanine pigment as a coloring agent. The copper phthalocyanine pigment has dispersibility in the resin, and can satisfy the limited number range within the above particle size range. As described above, the copper phthalocyanine pigment has dispersibility in the binder resin, and a toner using it has uniform electrical properties and excellent light transmittance.

Figure 5 shows the absorption wavelength in the visible region of a toner in which a conventional yellow colorant was used, and Figure 6 shows a toner in which a yellow colorant according to the present invention was suitably dispersed. This is a study of the absorption wavelength of toner in the visible region. As shown in FIGS. 5 and 6, each yellow toner contains 40
It has almost the same absorption value near the wavelength of 0n. On the other hand, it was found that in other visible wavelength ranges (500 ni+ or more), it does not absorb light and is transparent.

It is also understood that conventional toners have poor light transmittance in this region. On the other hand, in the yellow toner according to the present invention, the function of the original colorant is the same as that of the conventional one,
Excellent light transmittance in other visible areas. The toner according to the present invention is suitable for use as a full-color developing eyebrow toner, and provides images with excellent reproducibility.

Further, the toner is formed to a thickness of 0.9 μm, and the dispersed colorant particles have a size of 10 to 12.5 μm12, and the area occupied by the yellow colorant dispersed in the area of the formed surface of 780,000 μva2 is used. It is also important for yellow toners that the number of dispersed colorant particles is 15 or less, especially 10 or less, and the number of dispersed colorant particles having a size of 12.5 to 15°0 μm2 is 10 or less, especially 5 or less. It is. In the case of a yellow toner, if the number of colorant particles is below the above range, the toner will have sufficient light transmittance, but if the number is above the above range, the light transmittance will deteriorate.

Further, in the yellow toner, it is preferable to use a benzidine pigment as a coloring agent.

The benzidine pigment has good dispersibility in the resin, and the formation of large-diameter dispersed colorant particles is small, so that the number can be kept within a limited number range. As described above, since the benzidine pigment has excellent dispersibility in the binder resin, it is possible to provide a yellow toner with excellent light transmittance.

In the present invention, the conductivity of the binder resin is 1, OX
It is important to satisfy the range of 10-' to s, ox 10-9 (s/cm), especially 1. OX 10” to 3
．． It is desirable to satisfy the range of 0x1O-9 (s/cm). If the conductivity of the binder resin is smaller than the above range, there will be a large difference in the conductivity of the various toners that are superimposed, resulting in greatly different development characteristics and transfer characteristics. For example, sample 4-5 of the experimental example (Table 4
), 8.9X 10-”s on the binder resin.
When a low conductivity of /c11 is used, carbon black raises the overall conductivity of the toner by 1.5x.
10-'s/cm. On the other hand, the conductivity of various other toners such as cyan, magenta, and yellow is 10X −”s
/cm, and various colorants do not significantly raise the conductivity of the entire toner like carbon blank.

For this reason, a difference occurs in the conductivity of the toners stacked one on top of the other.

However, if a binder resin with conductivity within the above range is used, in the magenta, cyan, and yellow toners of the present invention, for example, in the experimental example 4 for magenta toner.
As seen in -1 and 4-2, there is no difference in the conductivity of the various toners. In development using full-color development toners with no difference in conductivity, the development characteristics and transfer characteristics of each color toner are almost constant, and image reproducibility is excellent. On the other hand, if the conductivity is greater than the above range, even if a charge is applied to the toner, the charge will have a long way to escape and the charged state will become unstable.

If the binder resin satisfies the above range, it satisfies the electrical characteristics of the toner of the present invention, but the resin of the toner of the present invention must be of the same type as the binder resin of other toners used at the same time. However, they may be different, or may be different. However, it is important that the conductivity of the binder resin of other toners satisfies the above range.

Also in the present invention. The melting temperature of the binder resin is 80
It is important to satisfy the range of 130°C to 130°C, and it is particularly desirable to satisfy the range of 90°C to 110°C. If the melting temperature is within the above range, each toner will have excellent color development even when stacked together.

If the melting temperature of the binder resin is higher than the above range, color development will be poor, and if it is lower than the above range, an offset phenomenon may occur.

(Embodiments of the Invention) The full-color developing toner according to the present invention will be explained in detail below.

The toner of the present invention is a full-color developing toner in which another toner of a different color is superimposed on the image on the transfer paper. That is, the target is toner that constitutes the basic color in full-color development. The basic toners for full-color development are mainly four types: magenta, cyan, yellow, and black. In full-color development, these toners are sequentially superimposed and developed to reproduce the tonal image quality of the original. These toners contain a coloring agent and, in some cases, a charge control agent in a binder resin, and further contain or are added with well-known toner compounding agents.

Binder Resin For the binder resin of the present invention, any known resin can be used, but as described above, the binder resin has an electrical conductivity of 1. OX 10-” to s, ox 10-” (s/am
) is important, especially 1,0×1
0-9 to 3. It is desirable that the binder resin satisfies the range of OX 10-" (s/cm). Also, the binder resin preferably has excellent light transmittance. Furthermore, the binder resin has a melting temperature of 8
It is important to satisfy the range of 0°C to 130°C, and it is particularly desirable to satisfy the range of 90°C to 110°C.

Resins with such characteristics include polyester, polystyrene, polyacrylic, polyether,
More than 111 materials can be selected from polyamides, polyolefins, etc., or used in combination.

As a specific polyester resin, the acid component thereof is an aromatic dicarboxylic acid, a fatty acid, or the like. More specific acid components include terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, maleic acid, fumaric acid, succinic acid, adipic acid, sebacic acid, cyclohexanedicarboxylic acid, and the like.

Terephthalic acid is mainly used. In addition, diol components include ethylene glycol, propylene glycol,
Examples include diethylene glycol, butanediol, cyclohexane dimetatool, hexylene glycol, triethylene glycol, glycerol, mannitol, pentaerythol, and the like.

Specific styrene-based resins include monomers such as styrene, α-methylstyrene, vinyltoluene, α-chlorostyrene, 0-211-*p-chlorostyrene, ethylstyrene, divinylstyrene, etc. alone or in combination. A polymerized product is used.

Examples of acrylic resins include ethyl acrylate,
Polymers of methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, acrylic acid, methacrylic acid, etc. may be used alone or in combination. In addition to those mentioned above, ethylenically unsaturated carboxylic acids and their anhydrides, such as maleic anhydride, fumaric acid, maleic acid, crotonic acid, and itaconic acid, can also be used.

Specific vinyl ether resins include vinyl-n-
Butyl ether, vinyl phenyl ether, vinyl cyclohexacyl ether, etc. are used.

Specific examples of polyamide-based resins include well-known resins consisting of diamines and dicarboxylic acids, and nylon 6 polymerized from lactam-based resins.

Specific olefin resins include ethylene, propylene, butene-1, pentene-1, methylpentene-1
etc.

Some of the above resins can be used alone, or a binder resin can be obtained by combining the resins on the two rice straws and mixing the resins so as to have the above-mentioned conductivity.

In the present invention, it is particularly preferable to use golyester resins in terms of electrical conductivity, light transmittance, and melt viscosity characteristics.

East 1 The colorant contained in the colored resin is magenta.

It can be broadly classified into cyan and yellow raw materials. Further, it is desirable that these colorants are contained in a range of usually 1% by weight to 20% by weight based on the binder resin.

As magenta colorants, C,1, Bigmen Trend 81, C,1, Bigmen Trend 122, C,1,
Pigment Red 57, C, 1, Truben Trend 49
, C,1, Truben Red 19, C,1, Solvent Red 52, C,1, Benck (Basic) Red 10
．． Examples include C.1, Disperse Red 15°, and the like.

Furthermore, among the magenta coloring agents, it is particularly desirable to use quinacridone pigments as they have good dispersibility with the binder resin. The quinacridone pigment has the following formula (R2 and R3 represent an imino group or a carbonyl group, and R
1, R4 is hydrogen, alkyl, halogen, etc. ).

Cyan colorants include C,1, Pigment Blue 1
5, C,1, Pigment Blue 16, C,1, Solvent Blue 25, C,1, Solvent Blue 55, C0■
, Solvent Blue 0. Examples include C,1, Direct Blue 86, C01, Direct Blue 251, and the like.

Among the cyan colorants, it is particularly desirable to use copper phthalocyanine pigments as they have good dispersibility with the binder resin. The copper phthalocyanine pigment is represented by the following formula, and the benzene nucleus in the structural formula may have an alkyl or halogen group substituted with hydrogen.

As colorants for yellow, nitro pigments such as Naphthol Yellow S, Hansa Yellow 5G, Viza Yellow 3
Examples include azo pigments such as G, Hansa Yellow G, Benzidine Yellow GR, Benzidine Yellow G, Palkan Fast Yellow 5G, and inorganic pigments such as yellow iron oxide and loess. Also, as dyes, C, 1. listed in the color index are used. Solvent Yellow 2, C,1, Solvent Yellow 6, C,1, Solvent Yellow 14,
C,1, Solvent Yellow 15, C,1, Solvent Yellow 16, C,1, Solvent Yellow 19, C,
1. There are oil-soluble dyes such as Solvent Yellow 21.

Among these yellow coloring agents, it is desirable to use organic dyes or pigments because they have good dispersibility with the binder resin. In particular, benzidine pigments have good dispersibility and particle size in the resin. It is possible to provide a yellow toner which is desirable in that it is thin and has excellent electrical properties.

Other Contents The binder resin may contain a charge control agent for controlling the charge of the toner. As charge control agent, any charge control agent known per se may be used, such as nigrosine base (CI 50415), oil black (CI 2
6150), oil-soluble dyes such as Spiron black, naphthenic acid metal salts, metal soaps, metal-containing azo dyes, pyrimidine compounds, and metal chelates of alkyl salicylic acids. Among these, particularly suitable charge control agents include salts of salicylic acid and zinc or zinc complex compounds, and salts of alkyl salicylic acid and zinc or zinc complex compounds.

The content is preferably 0.5 to 5.0% by weight based on the binder resin.

Toner The full-color developing toner formed from the above components has a particle size of 5 to 20 μm, particularly 8 to 1 μm, based on the volume-based median diameter determined by a Coulter counter.
It is preferable that the particle diameter is in the range of 5 μm.Also, the fluidity may be improved by sprinkling inorganic particles such as hydrophobic silica particles or organic particles made of various polymers on the surface of the toner. good.

(1) Magenta toner In the present invention, the magenta toner is further added to a thickness of 0.9 μm.
When the molding surface is formed into a shape of 1.m, the colorant particles appearing on the molding surface are in a dispersed state as fine particles.1. The dispersion state is such that the number of particles having a size of 1 to 12.5 μm2 is 40 or less per 780,000 μm2 of the forming surface, especially 3
It is important that the number of particles having 0 or less and many 12.5 to 15.0 μm2 particles is limited to 20 or less, particularly 10 or less. Also, the toner transmittance T
% (550 nm) is 2% or less, the toner transmittance T
% (440 nm) satisfies a range of 40% or more, particularly 45% or more.

(2) Cyan toner In the present invention, the cyan toner is further added to a thickness of 0°9 μm.
When it is formed, the colorant particles that appear on the molding surface are in a dispersed state as fine particles, and the dispersion state is 1.
80 or less particles having a size of 0 to 12.5 μm2 per 780,000 μm2 of the forming surface, especially near 0
It is important that the presence of particles having a diameter of 111LX and below and a size of 12.5 to 15.0 μm2 is limited to 50 or less, particularly 40 or less. Further, when the toner transmittance T% (600 nm) is 2% or less, it is desirable that the toner transmittance T% (490nffl) satisfies a range of 70% or more, particularly 75% or more.

(3) Yellow toner In the present invention, furthermore, when the toner is formed to a thickness of 0.9 μm, the colorant particles appearing on the molding surface are in a dispersed state as fine particles, and the dispersion state is 10 to 10 μm. 12.5μ] 2 has a surface area of 7
15 or less per 80,000 μm2.

In particular, it is important that the number of particles having a size of 12.5 to 15.0 μm2 is limited to 10 or less, particularly 5 or less. Further, when the toner transmittance T% (400 nm) is 2% or less, it is desirable that the toner transmittance T% (550 nm) satisfies a range of 75% or more, particularly 80% or more.

When the above toner is mixed with a magnetic carrier and used as a two-component developer, a known magnetic carrier used in this field can be used, but it is usually preferable to use ferrite particles that can form a soft magnetic brush. preferable.

As described above, according to the present invention, the presence of particles of 10 to 12.5 μm and particles of 12.5 to 73 to 15.0 μm among the dispersed colorant particles in the resin is restricted to a certain level of placement. As a result, the light transmittance of toners such as magenta, cyan, and yellow can be increased. Therefore, a toner with increased light transmittance can be suitably used as a full-color developing toner that is used in a superimposed manner.

Further, according to the present invention, the electrical conductivity is 1. OX 10-' to 5. By using a resin that satisfies the range of OX 10-" (s/am) as the binder resin of the toner, the toner for full color development can be used with less difference in electrical properties between the toners used in layers. You can. And,
Such a reduction in the difference in electrical properties makes it possible to make the development conditions substantially constant with other toners during full color development. Furthermore, variations in the amount of transferred toner can be reduced, and full-color development with excellent image reproducibility can be achieved.

(Experiment Example 1) Example 1-2 2 (1) Manufacture of magenta toner A polyester resin as a binder resin and a quinacridone colorant as a colorant were used, and if necessary, a charge control agent was added to these components. In addition, it was thoroughly kneaded, crushed, and classified. As a result, toner having a particle size of 5 μm to 15 μm was obtained.

In addition, a toner forming surface 780 formed to a thickness of 0.9 H
Colorant particles in 000 μm2 have a particle size of 10.0 to 12.0 μm2.
30 particles per particle size 12.5 to 15.0μ in 5μm2
Kneading was performed so that there were 10 pieces in m2.

As shown in Table 1, the transmittance T% of the obtained toner at 550 nm was 2%, and the transmittance T% at 440 nm was 48%. Incidentally, FIG. 2 shows the relationship between wavelength and transmittance.

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

(2) Manufacture of cyan toner The same binder resin as the magenta toner was used, the coloring agent was copper phthalocyanine, and the toner was formed in a dispersed state to a thickness of 0.9 IIm, and the forming surface was 7800 mm thick.
Colorant particles in 00μm2 have a particle size of 10.0 to 12゜5
60 pieces each particle size 12.5 to 15.0 μm in μm2
In step 2, kneading was performed so that the number of pieces was 35.

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

(3) Manufacture of yellow toner The same binder resin as the magenta toner is used, the colorant is benzidine, and in a monodispersed state, the toner is formed to a thickness of 0.9 am, and the formed surface is 780,000 μs.
Kneading was carried out so that the number of colorant particles in No. 2 was 1OfIA when the particle size was 10.0 to 12.5 μm2, and 5 when the particle size was 12.5 to 15.0 μm2.

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

Full-color development was performed using the various toners (1) to (3) under the same conditions shown in Table 1, and the images were evaluated by superimposing them on a transfer material. The results of the evaluation are shown in Table 1.

Experimental Examples 1-2 to 1-5 (1) Production of magenta toner In the same manner as in Experimental Example 1-1, a toner with a particle size of 5 μm to 15 μm was prepared, and dispersed particles of a colorant as shown in Table 1 were prepared. The number and toner transmission were obtained.

The obtained toner was made into a two-component glare agent in the same manner as in Experimental Example 1-1.

Furthermore, the same cyan toner and yellow toner as in Experimental Example 1-1 were used. Using these toners, images were evaluated in the same manner as in Experimental Example 1-1. The results of the evaluation are shown in Table 1.

Experimental Example 1-6 (1) Production of magenta toner The binder resin of the toner is polyester, the colorant is quinacridone, and these components are kneaded in the usual manner with the addition of a charge control agent if necessary, pulverized, Classified. As a result, toner having a particle size of 5 μm to 15 μm was obtained.

In addition, the toner forming surface 7 formed to have a thickness of 0.9 mm
Colorant particles in 80000 μm2 have a particle size of 10.0 to 1
120 particles in 2.5 μm2, particle size 12.5 to 15
．． At 0 μm2, there were 80 pieces.

The transmittance T% of the obtained toner at 550 nm is 1.5%,
The transmission IT% at 440 nm was 20%.

Incidentally, FIG. 1 shows the relationship between wavelength and transmittance.

From this, it is understood that the conventional dispersed toner has poor light transmittance.

Furthermore, the same cyan toner and yellow toner as in Experimental Example 1-1 were used, and the images were evaluated in the same manner. As a result, the image became dark, and its transparency and vividness were significantly inferior.

(Experimental example 2) Cold crushing example 2-1 (1) Production of cyan toner A polyester resin as a binder resin and a copper phthalocyanine colorant as a colorant are used, and these components are mixed with a charge control agent if necessary. It was thoroughly kneaded, crushed and classified. As a result, toner having a particle size of 8 μm to 15 μm was obtained.

In addition, a toner forming surface 78 formed to a thickness of 0.9 am
Colorant particles in 0000 μn2 have a particle size of 10.0 to 12
．． 60 pieces at 5 μm I+2, particle size 12.5 to 15
．． Kneading was carried out so that 35 pieces were mixed in 0 μ Feng 2.

As shown in Table 2, the transmittance T% of the obtained toner at 600 nm was 1.0%, and the transmittance T% at 490 nm was 76%. Incidentally, FIG. 4 shows the relationship between wavelength and transmittance.

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

(2) Manufacture of yellow toner The same binder resin as the cyan toner was used, and the coloring agent was a benzidine-based one in a dispersed state.

The toner is formed to a thickness of 0.911 m, and the forming surface 780
Colorant particles in 000 μm2 have a particle size of 10.0 to 12.0 μm2.
10 particles in 5μm2, particle size 12.5 to 15.0μ
Kneading was performed so that there were 5 pieces in m2.

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

(3) Manufacture of magenta toner The same binder resin as the cyan toner is used, the colorant is benzidine, and in a dispersed state, the toner is formed to a thickness of 0.9 am, and the formed surface is 780,000 μm2.
Kneading was carried out so that the number of colorant particles in the mixture was 30 particles with a particle size of 10.0 to 12.5 μm 2 and 10 particles with a particle size of 12.5 to 15.0 μm 2 .

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

Full-color development was performed using the various toners (1) to (3) under the same conditions shown in Table 2, and the images were evaluated by superimposing them on a transfer material. The evaluation results are shown in Table 2.

Experimental Examples 2-2 and 2-3 (1) Production of cyan toner A toner with a particle size of 8 μm to 15 μm was prepared in the same manner as in Experimental Example 2-1, and colorant dispersed particles as shown in Table 2 were prepared. The number and toner transmission were obtained.

The obtained toner was made into a two-component developer as in Experimental Example 2-1.

Further, full color development was performed using the same magenta toner and yellow toner as in Experimental Example 2-1, and the images were evaluated by superimposing them on a transfer material. The evaluation results are shown in Table 2.

Experimental Example 2-4 (1) Production of cyan toner The binder resin of the toner is polyester, and the coloring agent is copper phthalocyanine. These components are kneaded in the usual way, adding a charge control agent if necessary, and then pulverized. , classified. As a result, toner having a particle size of 8 μm to 15 μm was obtained.

Further, the colorant particles in the forming surface 780,000 μm' of the toner formed to a thickness of 0.9 + nm have a particle size of 10. 110 pieces in O to 12.5 μm2, particle size 12.5 to 1
There were 80 pieces at 5.0 μm2.

The transmittance T% of the obtained toner at 60Or+m is 0.5%
, the transmittance T% at 490 nm was 64%.

Incidentally, FIG. 3 shows the relationship between wavelength and transmittance.

From this, it is understood that the conventional dispersed state has poor light transmittance.

Furthermore, full color development was performed using the same magenta toner and yellow toner as in Experimental Example 2-1, and the images were evaluated by overlapping them on a transfer material. As a result, the image became dark and lacked vividness and transparency.

Roasted 1 Gomata 2 Ko (1) Production of cyan toner Toner forming surface 7800 formed to a thickness of 0.9 am
Colorant particles in 00 μm2 have a particle size of 10.0 to 12.5
78 pieces each particle size 12.5 to 15.0 μm in μ12
The procedure was the same as in Experimental Example 2-4, except that in No. 12, kneading was performed so that 53 pieces were mixed.

The magenta toner and yellow toner were the same as those in Experimental Example 2-1. Full-color development was performed using these toners, and the images were evaluated by superimposing them on a transfer material. As a result, the images lacked vividness.

(Fruitful example 3) Example 3-1 (1) Production of yellow toner A polyester resin as a binder resin and a benzidine coloring agent as a coloring agent are used, and these components are mixed with a charge control agent if necessary. It was thoroughly kneaded, crushed and classified. As a result, a toner having a particle size of 5 μm to 15 μm was obtained.

In addition, a toner forming surface 78 formed to have a thickness of 0.9 mm
Colorant particles in 0000 μm2 have a particle size of 10.0 to 12
．． 10 pieces each particle size 12.5 to 15.0 in 5 μm2
Kneading was performed so that there were 6 pieces in μm2.

As shown in Table 3, the transmittance T% of the obtained toner at 400 nm was 2%, and the transmittance T% at 550 nm was 80%. Incidentally, FIG. 6 shows the relationship between wavelength and transmittance.

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

(2) Manufacture of magenta toner The binder resin used is the same as that used for the yellow toner.1 The coloring agent is quinacridone, and in a dispersed state, the toner is formed to a thickness of 0.911 m, and the formed surface is 780,000 μm.
Colorant particles in ry2 have a particle size of 10.0 to 12.5 μm
Kneading was carried out so that the number of particles was 30 in No. 2 and 10 in particle size of 12.5 to 15.0 μm.

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

(3) Production of cyan toner The binder resin used is the same as that used for the yellow toner, the coloring agent is copper phthalocyanine, and the toner is formed in a dispersed state to a thickness of 0.911I11, and the forming surface 780
Colorant particles in 000 μm2 have a particle size of 10. O to 125
60 particles in μm2, particle size 12.5 to 15.0 μm
In step 2, kneading was performed so that the number of pieces was 35.

The above toner and a known magnetic ferrite carrier were mixed to form a two-component developer.

Full-color development was performed using the various toners (1) to (3) under the same conditions shown in Table 3, and the images were evaluated by superimposing them on a transfer material. The results of the evaluation are shown in Table 3.

Experimental Examples 3-2 to 3-4 (1) Production of yellow toner In the same manner as in Experimental Example 3-1, a toner with a particle size of 5 μm to 15 μm was prepared, and the number of dispersed particles of one colorant was as shown in Table 3. and toner transmittance were obtained.

The obtained toner was made into a two-component developer in the same manner as in Experimental Example 3-1.

Furthermore, the same magenta toner and cyan toner as in Experimental Example 3-1 were used. Full-color development was performed using these toners, and the images were evaluated by superimposing them on a transfer material. The evaluation results are shown in Table 3.

Flaming Example 3-5 (1) Production of yellow toner The binder resin of the toner is polyester, and the coloring agent is benzidine.These components are kneaded in the usual way, adding a charge control agent if necessary, and then pulverized. , classified. As a result, toner having a particle size of 5 μm to 15 μD was obtained.

In addition, the toner forming surface 7 formed to have a thickness of 0.9 mm
Colorant particles in 80000 μm2 have a particle size of 10.0 to 1
30 pieces in 2.5 μm2, particle size 12.5 to 15.
Kneading was performed so that there were 25 pieces at 0 μm2.

The transmittance T% of the obtained toner at 400 nm is 2.0%,
Transmittance T% at 550 nm was 62%.

Incidentally, FIG. 5 shows the relationship between wavelength and transmittance.

From this, it is understood that the conventional dispersed state has poor light transmittance.

Further, full color development was performed using magenta toner and cyan toner similar to those used in Experimental Example 3-1, and the images were evaluated. As a result, the image showed density unevenness and lacked vividness.

(Experimental Example 4) Experimental Example 4-1 The conductivity of the binder resin is 2.5 x 10-9 (s/
cm) and 100 parts by weight of a polyester resin with a melting temperature of 90°C and 4.0 parts by weight of a quinacridone pigment as a coloring agent to form a toner with a thickness of 0.9 μm. The area occupied by the quinacridone pigment dispersed in 780,000 μm2, 10 to 12.5 μm
Toner particles having an average particle size of 10 μm were prepared by kneading 29 dispersed particles having a size of m2 and 8 dispersed particles having a size of 12.5 to 15.0 μm2. The conductivity of this toner is 2.5 x 10-
9 (s/cm).

Hereinafter, 3.0 parts of benzidine pigment was added to 100 parts by weight of the same binder resin as above. Q! The dispersion state of benzidine pigment, which is a coloring agent for yellow toner, is
The thickness of the toner is formed to 0.9 μm, and the forming surface 7800
Pigment particles in 00μm2 have a particle size of 10.0 to 12.5μ
112, 10 particles, particle size 12.5 to 15, μm
In Step 2, knead so that there are 5 particles and the average particle size is 10.
Toner particles of μm were prepared. The conductivity of this toner is 2
．． It was 6 x 10-9 (s/cm).

Furthermore, using 4.0 parts by weight of a copper phthalocyanine pigment for 100 parts by weight of the same resin, the dispersion state of the copper phthalocyanine pigment, which is a coloring agent, was adjusted to a toner thickness of 0.9 μm. Formation surface 78000
Pigment particles in 0 μm2 have a particle size of 10.0 to 12.5 μm
2, and 36 particles with a particle size of 12.5 to 15.0 μm2, so that the average particle size was 10 μm.
m toner particles were prepared. The conductivity of this toner is 2.
It was 5 x 10-9 (s/cm).

Furthermore, a black toner was prepared in the same manner using a conventional method using 4 parts by weight of carbon black per 100 parts by weight of the binder resin. The conductivity of this toner is 2.7X10-9 (s
/cm).

A developer for each color is prepared by mixing the above-mentioned toners of each color with a known ferrite carrier, and full-color development is performed under the same development conditions and superimposed on a transfer material to obtain a full-color image. Image section 20
% of manuscripts were used. ) and transfer rate were measured. The results are shown in Table 4.

Hitaka Examples 4-2 to 4-5 Experimental Example 4-1 except that the electrical conductivity of the binding resin, the melting temperature, the magenta colorant, and the dispersion state of the colorant in various toners were changed as shown in Table 4. An experiment was conducted in the same manner. The results are shown in Table 4.

From Experimental Examples 4-1 and 4-2, the magenta toner of the present invention has excellent developability and transferability with other color toners, and has excellent transparency and color development, so it does not cause density unevenness in images. It can be seen that it provides vivid, full-color images without any color.

(Experimental Example 5) Experimental Examples 5-1 to 5-5 Experimental examples were conducted by changing the conductivity of the binder resin, the melting temperature, the cyan colorant, and the dispersion state of the colorant in various toners as shown in Table 4. Various toners were produced in the same manner as in 4-1, and full color development was evaluated.

The results are shown in Table 5.

(Experimental Example 6) Experimental Examples 6-1 to 6-5 Experimental examples were carried out by changing the conductivity of the binder resin, the melting temperature, the cyan colorant, and the dispersion state of the colorant in various toners as shown in Table 4. Various toners were produced in the same manner as in 4-1, and full color development was evaluated.

The results are shown in Table 6.

Experimental Examples 5-1 and 5-2 show that the cyan toner of the present invention has excellent developability and transferability with other color toners, and has excellent transparency and color development, so it does not cause density unevenness in images. It can be seen that it provides vivid, full-color images without any color.

From Experimental Examples 6-1 and 6-2, the yellow toner of the present invention has excellent developability and transferability with other color toners, and has excellent transparency and color development, so it does not cause density unevenness in images. It can be seen that it provides vivid, full-color images without any color.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram showing the transmittance of a conventional toner using a magenta coloring agent, FIG. 2 is a characteristic diagram showing the transmittance of a toner according to the present invention using a magenta coloring agent, Figure 3 is a characteristic diagram showing the transmittance of a conventional toner using a cyan colorant, and Figure W4 is a characteristic diagram showing the transmittance of the toner according to the present invention using a cyan colorant. FIG. 5 is a characteristic diagram showing the transmittance of a conventional toner using a yellow coloring agent, and FIG. 6 is a characteristic diagram showing the transmittance of a toner according to the present invention using a yellow coloring agent. FIG. 7 is a diagram illustrating the principle of a full-color developing device.

Claims (12)

[Claims] (1) A toner in which a magenta coloring agent is dispersed in a binder resin, and the toner is formed to a thickness of 0.9 μm and is dispersed over an area of 780,000 μm^2 on the forming surface. The area occupied by the colorant is 10 to 12.5μ
It is characterized by having 40 or less dispersed colorant particles having a size of m^2 and 20 or less dispersed colorant particles having a size of 12.5 to 15.0 μm^2. A full-color developing toner with excellent transparency. (2) Full color according to claim 1, characterized in that the conductivity of the binder resin satisfies the range of 1.0 x 10^-^9 to 5.0 x 10^-^9 (s/cm). Toner for development. (3) The toner for full color development according to claim 1 or 2, wherein the melting temperature of the binder resin is in the range of 80 to 130°C. (4) The full-color developing toner according to any one of claims 1 to 3, wherein the colorant is a quinacridone pigment. (5) A toner in which a cyan coloring agent is dispersed in a binder resin, wherein the toner is formed to a thickness of 0.9 μm and is dispersed over an area of 780,000 μm^2 of the formed surface. The area occupied by the colorant is 10 to 12.5 μm
80 or less dispersed colorant particles having a size of ^2,
A toner for full color development with excellent transparency, characterized in that 50 or less dispersed colorant particles having a size of 12.5 to 15.0 μm^2 are dispersed. (6) Full color according to claim 5, characterized in that the conductivity of the binder resin satisfies a range of 1.0 x 10^-^9 to 5.0 x 10^-^9 (s/cm). Toner for development. (7) The toner for full color development according to claim 5 or 6, wherein the melting temperature of the binder resin is in the range of 80 to 130°C. (8) The full-color developing toner according to any one of claims 5 to 7, wherein the colorant is a copper phthalocyanine pigment. (9) A toner in which a yellow coloring agent is dispersed in a binder resin, the toner being formed to a thickness of 0.9 μm and dispersed over an area of 780,000 μm^2 of the forming surface. The area occupied by the colorant is 10 to 12.5μ
It is characterized by having 15 or less dispersed colorant particles having a size of m^2 and 10 or less dispersed colorant particles having a size of 12.5 to 15.0 μm^2. A full-color developing toner with excellent transparency. (10) The conductivity of the binder resin is 1.0×10^-^9
to 5. 10. The toner for full color development according to claim 9, characterized in that it satisfies the range of 0x10^-^9 (s/cm). (11) Claim 9 or 10, characterized in that the melting temperature of the binder resin is in the range of 80 to 130°C.
Toner for full color development as described in section. (12) The full-color developing toner according to any one of claims 9 to 12, wherein the colorant is a benzidine pigment.