JPH0820749B2 - Non-magnetic single component color toner - Google Patents

Description

The present invention relates to a non-magnetic one-component color toner for developing an electrostatic charge image in electrophotography, electrostatic recording, electrostatic printing and the like.

[Conventional technology]

It is well known in the art to image and develop the surface of a photoconductive material by electrostatic means.

That is, U.S. Pat.No. 2,297,691, Japanese Patent Publication No. 42-23910
A number of methods are known, such as JP-B No. 43-24748 and JP-B No. 43-24748. Generally, a photoconductive substance is used to form an electric latent image on a photoreceptor by various means, A toner image corresponding to an electrostatic latent image is formed by adhering a very finely ground electrophotographic material called toner on the latent image.

Then, if necessary, the toner is transferred onto the surface of an image support such as paper, and then fixed by heating, pressurizing or solvent vapor to obtain a copy. In addition, when there is a step of transferring the toner image, a step for removing the residual toner is usually provided.

The developing method visualized using an electric latent image toner is, for example, a powder cloud method described in U.S. Pat.No. 2,221,776, a cascade developing method described in No. 2,618,552, and 2,874,063. A magnetic brush method described in Japanese Patent No. 3,909,258 and a method using a conductive magnetic toner described in No. 3,909,258 are known.

As the toner applied to these developing methods, generally, a thermoplastic resin in which a colorant is mixed and dispersed and then pulverized is used. Polystyrene resin is the most common thermoplastic resin, but polyester resin, epoxy resin, acrylic resin, urethane resin, etc. are also used. Carbon black is most widely used as the colorant, and iron oxide-based black magnetic powder is often used in the case of magnetic toner. In the case of a system using a so-called two-component developer, the toner is usually used by being mixed with carrier particles such as glass beads and iron powder.

The toner image on the final copy image forming member such as paper is
It is permanently fixed on the support by pressure or the like. Conventionally, this fixing process has been often adopted by heat.

In addition, when there is a step of transferring a toner image, a step for removing the residual toner on the photoconductor is usually provided.

In recent years, the development from mono-color copying to full-color copying is rapidly progressing in copying machines and the like, and two-color copying machines and full-color copying machines are being studied and put into practical use. For example, "Journal of the Electrophotographic Society" Vo122, No.1 (1983)
There are also reports of color reproducibility and gradation reproducibility, such as "Electronic Society of Japan" Vo125, No.1, P52 (1986).

However, it is not immediately contrasted with the real thing like TV, photographs and color prints, and for those who can see color images that are more beautifully processed than the real ones, the full-color electrophotographic images currently in practical use are not always necessary. It is not satisfactory.

Color image formation by full-color electrophotography generally reproduces all colors using color toners of three primary colors of yellow, magenta, and cyan.

The method is to first form the electrostatic latent image on the photoconductive layer by passing the light from the original through the color-separating light-transmitting filter, which has a complementary color relationship with the color of the toner, and then developing and transferring the toner onto the support. Hold it. This process is sequentially performed a plurality of times, the toners are superposed on the same support while matching the resist ratio, and then the final full-color image is obtained by fixing once.

In recent years, demands for high-definition and high-quality copying machines have increased in the market, and attempts have been made in the technical field to reduce the particle size of toner to achieve high-quality color. As the toner becomes finer, the surface area per unit weight increases, and the amount of electrification of the toner tends to increase, and there is concern that the image density will be low and the durability will deteriorate. In addition, since the amount of electrification of the toner is large, the adhesion between the toners is strong, the fluidity is lowered, and problems arise in the stability of toner replenishment and in imparting tribo to the replenishment toner.

Further, since the color toner does not contain a magnetic substance or a conductive substance such as carbon black, there is no portion for leaking charge, and the amount of electrification generally tends to increase.
This tendency is more remarkable when a polyester binder having high charging performance is used.

Further, especially in color toners, the following characteristics are strongly desired.

(1) The fixed toner needs to be in a state of almost completely melted so that the shape of the toner particles cannot be discriminated so as not to diffusely reflect light and prevent color reproduction.

(2) It must be a colored toner having transparency that does not interfere with the toner layers of different tones below the toner layer.

(3) Each of the constituent toners must have well-balanced hue and spectral reflection characteristics and sufficient saturation.

From this point of view, many studies on binder resins have been made, but a toner satisfying all the above characteristics has not been developed yet. Today, polyester resins are often used as binder resins for color in the technical field, but toners made of polyester resins are generally susceptible to temperature and humidity, and have excessive charge amount under high humidity and high humidity. There is a problem that the charge amount is insufficient under the color toner, and a color toner having a stable charge amount is desired even in a wide range of environments.

Many studies have been conducted today to achieve excellent triboelectricity against the above problems.

For example, as a technique for adding a charging auxiliary agent such as chargeable fine particles to a toner, JP-B-52-32256, JP-A-56-56
In the −64352 publication, resin fine powder having a polarity opposite to that of the toner,
Further, Japanese Patent Application Laid-Open No. 61-160760 proposes a technique of adding a fluorine-containing compound to each developer to obtain stable triboelectric charging properties, and many charging aids have been developed even today. There is.

Further, various methods have been devised as a method of adding the charging auxiliary agent as described above. For example, a method of adhering the toner particles to the surface of the toner particles by an electrostatic force between the toner particles and the charging aid or a Van der Waals force is generally used.
A mixer or the like is used. However, in this method, it is not easy to uniformly disperse the additives on the surface of the toner particles, and the additives are not attached to the toner particles and the additives become aggregates, so that the existence of the additives in a so-called free state is not detected. It is difficult to avoid. This tendency becomes more remarkable as the specific electric resistance of the charging aid is larger and the particle size is smaller.
In such a case, the performance as a developer is affected.
For example, the amount of triboelectricity of the toner becomes unstable, the image density is not constant, and the image has a lot of fog.

On the other hand, when continuous copying or the like is performed, the content of the charging aid changes and the initial image quality cannot be maintained, which is a drawback.

As another addition method, there is a method of previously adding the charging auxiliary together with the binder resin and the colorant at the time of manufacturing the toner. However, it is not easy to homogenize the charge control agent, and it is near the surface of the toner particles that substantially contributes to the charge control, and the charge auxiliary agent and the charge control agent present inside the particles have a charge property. Therefore, it is not easy to control the addition amount of the charging aid and the dispersion amount on the surface. Further, even in the toner obtained by such a method, the triboelectric charge amount of the toner is unstable and it is not possible to easily obtain a toner satisfying the developer characteristics as described above. The reality is that no product of satisfactory quality has been obtained.

Further, in recent years, various non-magnetic one-component color developing systems that do not use so-called carriers have been proposed for the purpose of downsizing and cost reduction of copying machines, as described in, for example, JP-A-58-116559. ing. However, it has been found that when the present developing system is applied to a color toner that requires a low melting point and a sharp melt, problems such as toner fusion on the developer carrier occur. In order to solve these problems, there is a method of coating the surface of the developer carrier,
For example, JP-A-57-66443 and JP-A-58-178380 have been proposed. However, especially when a small-diameter toner is applied, there is a problem that fusing cannot be sufficiently prevented. is there.

[Problems to be Solved by the Invention]

An object of the present invention is to provide a non-magnetic one-component color toner for developing an electrostatic charge image, which solves the above problems.

That is, the object of the present invention is to have stable triboelectric chargeability under various environments such as changes in temperature and humidity, to give clear image characteristics without fog, and to develop toner particles at any particle size. An object of the present invention is to provide a non-magnetic one-component color toner that does not fuse to the surface of the agent carrier.

[Means and Actions for Solving the Problems]

According to the present invention, a toner supply roller and a toner coating blade are brought into contact with a toner carrier having a resin layer containing solid lubricant fine particles or at least fine particles having a solid lubricant on the surface thereof so that the toner carrier is non-magnetic. After supplying and coating the component type color toner, a DC / AC superimposed electric field is applied in the developing region between the toner carrier and the latent image carrier facing the toner carrier to form the latent image on the latent image carrier. A non-magnetic one-component color toner used in an image forming method of developing with a magnetic one-component color toner, wherein the non-magnetic one-component color toner has non-magnetic colorant-containing resin particles and an external additive, The additive has a particle size of 20 to 200 mμ and a specific electric resistance of 10 ⁶ to 10
^The nonmagnetic one-component color toner has a volume average particle size of ¹⁴ Ωcm and contains organic resin particles that are charged to the opposite polarity to the nonmagnetic colorant-containing resin particles when frictionally charged with iron powder. 6
˜10 μm, containing 15 to 40% by number of non-magnetic colorant-containing resin particles having a particle size of 5 μm or less, 12.7 to 16.0 μ
The resin particles containing the non-magnetic colorant having a particle diameter of m are 0.1 to 5.0.
Non-magnetic colorant-containing resin particles having a particle size of 16 μm or more are contained in an amount of 1.0% by volume or less, and 6.35 to 10.1
Resin particles containing a non-magnetic colorant having a particle size of Here, V: volume% of non-magnetic colorant-containing resin particles having a particle diameter of 6.35 to 10.1 μm N: number% of non-magnetic colorant-containing resin particles having a particle diameter of 6.35 to 10.1 μm dv: total non-magnetic The present invention relates to a non-magnetic one-component color toner having a particle size distribution satisfying the volume average particle size of colorant-containing resin particles.

The inventors of the present invention have diligently studied the environmental stability of the charging property of the non-magnetic single-component color toner for electrostatic charge development and the non-fusing property of the toner on the surface of the developer carrier, and as a result, the colorant as an external additive. Toner added with organic resin particles having a particle size of 20 to 200 mμ and a specific electric resistance of 10 ⁶ to 10 ¹⁴ Ωcm, which has a polarity opposite to that of the resin particles contained, is extremely excellent in the stability of electrification in various environments and is good without fog. It has been found that the toner particles do not fuse to the surface of the developer carrying body at any particle size while providing a good image.

The reason is that the above-mentioned organic resin particles neutralize the charge gap caused by excessive rubbing between the non-magnetic colorant-containing resin particles and the toner carrier used in the present invention.

Furthermore, by adding the organic resin particles, the rise of charging of the toner is promoted, and very stable charging characteristics are achieved from the initial stage.

The reason for this is not clear yet, but it is presumed as follows. That is, the organic resin particles are strongly attracted and charged to the toner carrier side rather than the non-magnetic colorant-containing resin particles when the toner is rubbed against the toner carrier. Therefore, the rising of the charge of the resin particles containing the non-magnetic colorant having the opposite polarity is promoted. On the other hand, after once rising, on the contrary, it is more strongly attracted to the non-magnetic colorant-containing resin particles than the toner carrier, and the function of neutralizing excessive charging works.
The toner having the constitution of the present invention can maintain the rising of the charge and the saturated charge amount level satisfactorily and stably in various environments.

Further, the toner of the constitution of the present invention, as described above, is prevented from excessive charging, electrostatic sticking is prevented, and further, the organic resin particles function as excessive spacer particles. Mechanical fixation is also prevented, and as a result, no toner particles are fused to the surface of the toner carrier.

In order to make the above-mentioned effect more effective, it is necessary that the particle size of the organic resin particles is 20 to 200 mμ, preferably 30 to 150 mμ, and the specific electric resistance is 10 ⁶ to 10 ¹⁴ Ωcm.

When the particle size is smaller than the above range, the organic resin particles adhere too strongly to the non-magnetic colorant-containing resin particles or are embedded therein, and the above effects are lost. On the other hand, when it is larger than the above range, the dispersion becomes non-uniform or liberated, and the effect disappears. Further, if the specific electric resistance is larger than 10 ¹⁴ Ωcm, the cohesiveness of the organic resin particles is increased and the mixing property is lowered, and at the same time, the organic resin particles themselves are charged and fly to the non-image area together with the toner to cause fog or toner carrying. This may cause adverse effects such as toner sticking to the body.
On the other hand, if it is less than 10 ⁶ Ωcm, the toner charge amount is reduced particularly under high temperature and high humidity, and as a result, fog and scattering occur or a leak phenomenon occurs during development, resulting in image defects.

In the present invention, it is preferable that the content of the organic resin particles is 0.1 to 5.0% by weight with respect to the resin particles containing the non-magnetic colorant in order to surely exhibit the performance and have a stable negative charging property.

When the content of the organic resin particles is less than 0.1% by weight, the negative chargeability cannot be stably obtained, and when it is more than 5.0% by weight, the miscibility is poor and the charging becomes unstable. There is a problem.

The organic resin particles of the present invention are also suitable when the toner has a small diameter.

That is, when the diameter of the toner is reduced, the number of contact points between the toner and the toner carrier increases, and the toner tends to adhere to the toner carrier, or the number of contact points between the toner and the toner increases.
There is a problem that toner blocking easily occurs. On the other hand, the spherical organic resin particles having a proper size of 20 to 200 mμ serve as a good spacer, and the above-mentioned problems do not occur, which gives good results. For toner blocking, it is more effective to use reverse polarity resin particles having a higher glass transition temperature (Tg) than the resin used for the non-magnetic colorant-containing resin particles.

As described above, there are some examples in which resin particles having opposite polarities are added to the toner, for example, JP-A-54-45135.
JP-B No. 52-32256 and JP-B No. 52-32256 propose the addition of colorless resin particles smaller than the toner particle size.

However, in these examples, the toner and the resin particles of opposite polarity behave separately, and the toner adheres to the latent image portion during development, whereas the resin particles of opposite polarity adhere to the background portion.

That is, the reverse polarity resin particles act to promote the charging of the toner. However, the present invention is characterized in that organic resin particles of opposite polarity, which are sufficiently smaller than the toner particle size, are used, and finally they are strongly adhered to the non-magnetic colorant-containing resin particles and behave as a unit.

Further, resin particles of opposite polarity have been conventionally used for the purpose of assisting charging of magnetic toner, which is difficult to have a large charge amount. On the other hand, the present invention is characterized in that it is positively used for non-magnetic color toners that tend to be excessively charged.

More recently, as disclosed in JP-A-1-113767, it has been proposed to use silica and organic resin particles in combination, but this is used to weaken the adhesion between the drum and the toner. Therefore, it is different from the non-magnetic one-component color toner of the present invention.

Further, in the present invention, for the purpose of positively neutralizing the toner charge, the triboelectric charge amount of the iron powder and the non-magnetic colorant-containing resin particles has a value of A _L at a temperature of 15 ° C./humidity of 10% RH. And the value at a temperature of 30 ° C / humidity of 80% RH is A _H, and the frictional charge of iron powder and organic resin particles is B _L at a temperature of 15 ° C / humidity of 10% RH. Assuming that the value at 80 ° C / humidity 80% RH is _BH , iron powder, non-magnetic coloring agent-containing resin particles and organic resin particles are 1.1 ≦ | _AL / _AH | ≦ 3.0 1.2 ≦ | _BL / B _H | ≦ 8.0 1.0 ≦ | (B _L / B _H ) / (A _L / A _H ) | ≦ 3.0 is preferable.

When each value is in the above range, the neutralization effect is insufficient, so that the image density is reduced under low humidity and the triboelectric charge amount is excessively reduced under high humidity, causing toner scattering and causing problems such as fog.

Incidentally, the particle size of the organic resin particles in the present invention, CAPA
Volume average particle diameter measured with a -500 type (manufactured by Horiba, Ltd.).

The monomer constituting the organic resin particles of opposite polarity used as an additive in the present invention is not particularly limited, but it needs to be selected in consideration of the chargeability of the toner. The following monomers may be mentioned as specific examples of the addition-polymerizable monomer that can be used in the present invention.

That is, styrene and its derivatives, for example, methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene, triethylstyrene, propylstyrene, butylstyrene, hexylstyrene, heptylstyrene, alkylstyrene such as octylstyrene, fluorostyrene, chlorostyrene. Halogenated styrenes such as bromostyrene, dibromostyrene, iodostyrene, nitrostyrene, acetylstyrene,
Methoxy styrene etc. are mentioned.

Further, addition-polymerizable unsaturated carboxylic acids, that is, addition polymerization such as acrylic acid, methacrylic acid, α-ethylacrylic acid, crotonic acid, α-methylcrotonic acid, α-ethylcrotonic acid, isocrotonic acid, tiglic acid, and ungeric acid. And unsaturated polymerizable aliphatic aliphatic dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, citraconic acid, mesaconic acid, glutaconic acid and dihydromuconic acid.

Further, it is also possible to use a metal salt of these carboxylic acids, and this metal salt can be carried out after completion of the polymerization.

Further, esterification products of the addition-polymerizable unsaturated carboxylic acid with an alcohol such as an alkyl alcohol, a halogenated alkyl alcohol, an alkoxyalkyl alcohol, an aralkyl alcohol and an alkenyl alcohol may be mentioned. Then, as specific examples of the alcohol, methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, amyl alcohol, hexyl alcohol, heptyl alcohol, octyl alcohol,
Alkyl alcohols such as nonyl alcohol, dodecyl alcohol, tetradecyl alcohol and hexadecyl alcohol; halogenated alkyl alcohols obtained by partially halogenating these alkyl alcohols; methoxyethyl alcohol, ethoxyethyl alcohol, ethoxyethoxyethyl alcohol, methoxypropyl alcohol, ethoxy Alkoxyalkyl alcohols such as propyl alcohol; aralkyl alcohols such as benzyl alcohol, phenylethyl alcohol and phenylpropyl alcohol; alkenyl alcohols such as allyl alcohol and crotonyl alcohol.

Also, amides and nitriles derived from the above-mentioned addition-polymerizable unsaturated carboxylic acids; aliphatic monoolefins such as ethylene, propylene, butene and isobutylene; vinyl chloride, vinyl bromide, vinyl iodide, 1,2-dichloroethylene. Halogenated aliphatic olefins such as 1,2-dibromoethylene, 1,2-diiodoethylene, isopropenyl chloride, isopropenyl bromide, allyl chloride, allyl bromide, vinylidene chloride, vinyl fluoride, vinylidene fluoride 1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 2,4-hexadiene, 3-methyl-2,4-hexadiene And conjugated diene-based aliphatic diolephins such as

Further, vinyl acetates, vinyl ethers; nitrogen-containing vinyl compounds such as vinylcarbazole, vinylpyridine, vinylpyrrolidone and the like can be mentioned.

As the organic resin particles used in the present invention, those obtained by polymerizing one kind or two or more kinds of these monomers can be used.

The reverse polarity organic resin particles used in the present invention are not limited to using only one type, and a plurality of types can be used in combination.

Further, as a method for producing organic resin particles of opposite polarity used in the present invention, spray drying method, suspension polymerization method, emulsion polymerization method, soap-free polymerization method, seed polymerization method, mechanical pulverization method, etc. to produce spherical fine particles. Any method that can be used can be used. Among these, particularly suitable is a soap-free polymerization method which does not hinder the charging property of the toner and has little environmental fluctuation of the specific electric resistance value because there is no residual emulsifier, but is not particularly limited. Absent.

The opposite polarity organic resin particles may be subjected to particle surface treatment, if necessary. As the method of surface treatment, a method of surface-treating a metal such as iron, nickel, cobalt, copper, zinc, gold or silver by a vapor deposition method or a plating method, or a metal oxidation such as the above-mentioned metal or magnetic material, conductive zinc oxide, etc. A method of immobilizing a substance or the like by ion adsorption or external addition, a pigment or a dye, and a triboelectrically chargeable organic compound such as a polymer resin may be supported by coating or external addition.

The molecular weight distribution of the organic resin particles used in the present invention preferably has a peak molecular weight in the range of 10,000 to 5,000,000, and more preferably in the range of 20,000 to 1,000,000. When the peak molecular weight is larger than 5,000,000, the fixability of the color toner is adversely affected, and when it is smaller than 10,000, contamination or blocking resistance is deteriorated.

In the present invention, the toner carrier surface layer may be any layer as long as the above-mentioned chargeability is satisfied, but in order to further clarify the effect of the present invention, it is a resin layer containing at least fine particles having a solid lubricant. It is necessary.

A method of forming the organic resin layer on the surface of the toner carrier will be described by taking a sleeve as an example of one form of the toner carrier.

As a general method for forming a film, a dipping method, a spray method, a roll coating method, a curtain coating method,
There are spatter methods and the like, and particularly the dipping method and the spray method are excellent for applying the coat of the present invention.

Specifically, in the spray method, the coating resin as a solid content is dissolved in a solvent, and the contents such as fine particles having solid lubricity are mixed with glass beads as necessary and dispersed by a paint shaker. After that, it is filtered with a nylon mesh or the like to form a paint, which is adhered to the sleeve cylinder by an air spray method so as to have a uniform thickness and dried by heating.

In terms of performance, the thickness of the organic resin layer should be 0.5 to 30μ.
It is also preferable from the viewpoint of manufacturing.

As the solid lubricant of the present invention, graphite, fluorinated graphite, molybdenum disulfide, tungsten disulfide, boron nitride, silicon nitride, calcium fluoride, barium fluoride, lead monoxide, molybdenum trioxide, etc. are used, and crystalline It is preferable that the toner has a relatively small triboelectric charge with respect to the toner. Particularly, crystalline graphite is preferable. Particle size is 0.5-10μ
The ones are good. Further, in addition to the fine particles having solid lubricity, conductive fine particles, semiconductive metal oxides and the like may be contained in the resin layer at the same time for the purpose of leaking charges of fine particles of the charged toner.

The material of the resin forming the organic resin layer is, for example,
Styrene resin, vinyl resin, polyether sulfone resin, polycarbonate resin, polyphenyl oxide resin, polyamide resin, fluorine resin, fiber resin, thermoplastic resin such as acrylic resin, epoxy resin, polyester resin, alkyd resin , Phenol resin, melamine resin, polyurethane resin, urea resin, silicone resin,
A thermosetting resin such as a polyimide resin or a photocurable resin can be used. Among them, those with releasability such as silicone resin and fluorine resin, or those with excellent mechanical properties such as polyether sulfone, polycarbonate, polyphenylene oxide, polyamide, phenol, polyester, polyurethane and styrene resin. Is more preferable.

In addition to the above-mentioned organic resin particles, a flow improver may be added to the non-magnetic one-component color toner of the present invention. As the flow improver, it is particularly preferable to use a hydrophobic inorganic oxide because it acts to promote the function of the organic resin particles in terms of chargeability and fluidity. In order to sufficiently exert its action, it is desired that the BET specific surface area is 80 m ² / g or more, and particularly when it is 150 m ² / g or more, the above-mentioned action can be caused more remarkably. it can.

As the hydrophobic inorganic oxide, it is particularly preferable to use a treated silica fine powder obtained by subjecting a silica fine powder produced by vapor-phase oxidation of a silicon halogen compound to a hydrophobic treatment. Among the treated silica fine powders, those obtained by treating the silica fine powders so that the hydrophobicity measured by the methanol titration test has a value in the range of 30 to 80 are particularly preferable.

As a method of hydrophobizing, it is imparted by reacting with silica fine powder or chemically treating with an organic silicon compound which physically adsorbs.

As a preferred method, silica fine powder produced by vapor phase oxidation of a silicon halogen compound is treated with an organosilicon compound.

Examples of such organosilicon compounds include hexamethyldisilazane, trimethylsilane, trimethylchlorosilane,
Trimethylethoxysilane, dimethyldichlorosilane,
Methyltrichlorosilane, allyldimethylchlorosilane, allylphenyldichlorosilane, benzyldimethylchlorosilane, bromomethyldimethylchlorosilane, α
-Chloroethyltrichlorosilane, ρ-chloroethyltrichlorosilane, chloromethyldimethylchlorosilane,
Triorganosilyl mercaptan, trimethylsilyl mercaptan, triorganosilyl acrylate, vinyldimethylacetoxysilane, dimethylethoxysilane,
Dimethyldimethoxysilane, diphenyldiethoxysilane, hexamethyldisiloxane, 1,3-divinyltetramethyldisiloxane, 1,3-diphenyltetramethyldisiloxane and terminal with 2 to 12 siloxane units per molecule There is dimethylpolysiloxane having a Si-bonded hydroxyl group for each unit located at. These are used alone or as a mixture of two or more.

As a commercial item, Taranox-500 (Tarco),
AEROSIL R-972 (Japan Aerosil Co., Ltd.) and the like are available. The amount added is 0.3 to 2% by weight with respect to the resin particles containing the non-magnetic colorant.

This addition amount is also related to the particle size distribution of the non-magnetic colorant-containing resin particles described below, but if it is less than 0.3% by weight, it is difficult to achieve appropriate fluidity, and if it is 2% by weight or more, toner scattering and fog may occur. Harm is likely to occur.

The toner according to the present invention may be blended with a charge control agent in order to stabilize the charging characteristics. At that time, a colorless or pale color charge control agent that does not affect the color tone of the toner is preferable.
Examples of the negative charge control agent at that time include organic metal complexes such as metal complexes of alkyl-substituted salicylic acid (eg, chromium complex or zinc complex of di-tert-butylsalicylic acid). When the negative charge control agent is added to the toner, it is 0.1 to 10 parts by weight, preferably 0.5 to 100 parts by weight of the binder resin.
It is recommended to add ~ 8 parts by weight.

As the colorant used in the present invention, a known face dyeing amount,
For example, Phthalocyanine Blue, Induslen Blue, Pekotsk Blue, Permanent Red, Lake Red,
Rhodamine lake, Hansa yellow, permanent yellow, benzine yellow and the like can be widely used.
The content thereof is 12 parts by weight or less, preferably 0.5 to 9 parts by weight, based on 100 parts by weight of the binder resin so as to sensitively reflect the transparency of the OHP film.

If necessary, the toner of the present invention may be mixed with additives within a range that does not impair the characteristics of the toner. Examples of such additives include polytetrafluoroethylene, zinc stearate, and polyvinylidene fluoride. And a fixing aid (for example, low molecular weight polyethylene, low molecular weight polypropylene, etc.).

In the production of the toner of the present invention, a method in which the constituent materials are well kneaded by a heat kneader such as a hot roll, a kneader or an extruder, and then mechanical pulverization or classification is performed, or a colorant is added to the binder resin solution. A method of obtaining a toner by dispersing materials such as, for example, spray-drying, or by mixing a predetermined material with a monomer that constitutes the binder resin and then polymerizing the emulsion suspension. Each method such as a toner manufacturing method can be applied.

The non-magnetic one-component color toner of the present invention has a volume average particle size of 6 to 10 μm, contains 15 to 40% by number of non-magnetic colorant-containing resin particles having a particle size of 5 μm or less, and 12.7 to 16.0. Non-magnetic colorant-containing resin particles having a particle size of μm are contained in an amount of 0.1 to 5.0% by volume, non-magnetic colorant-containing resin particles having a particle size of 16 μm or more are included in an amount of 1.0 volume% or less, and particles of 6.35 to 10.1 μm are included. The non-magnetic colorant-containing resin particles having a diameter have the following formula Here, V: volume% of non-magnetic colorant-containing resin particles having a particle diameter of 6.35 to 10.1 μm N: number% of non-magnetic colorant-containing resin particles having a particle diameter of 6.35 to 10.1 μm dv: total non-magnetic Since the particle size distribution satisfies the volume average particle size of the colorant-containing resin particles, the effect is more remarkable.

The toner having the above particle size distribution can faithfully reproduce the latent image formed on the photoconductor, and is excellent in the reproducibility of minute dot latent images such as halftone dots and digital images.
Particularly, an image having excellent gradation and resolution in a highlight portion is provided. Furthermore, even when copying or printing out is continued, high image quality is maintained, and even in the case of a high density image, good development can be performed with a toner consumption amount smaller than that of the conventional non-magnetic toner. Also, it is advantageous in terms of performance and miniaturization of the copying machine or printer body.

The reason why such effects can be obtained in the non-magnetic one-component color toner of the present invention is not always clear,
It is estimated as follows. (In the following description regarding the toner particle size distribution, "non-magnetic colorant-containing resin particles" are abbreviated as "toner particles".

Conventionally, in non-magnetic color toners, toner particles of 5 μm or less are difficult to control the charge amount, impair the fluidity of the toner, and scatter the toner to stain the machine. It was thought that it was necessary to positively decrease the resulting components.

However, according to the study by the present inventors, it has been found that toner particles of about 5 μm are an essential component for forming a high quality image.

For example, by using a non-magnetic toner having a particle size distribution ranging from 0.5 μm to 30 μm and a two-component developer having a carrier, the surface potential on the photoconductor is changed, and a large development potential contrast that easily develops many toner particles , To a halftone, and even a small minute dot latent image where only a few toner particles are developed, develop a latent image with a latent image potential changed on the photoconductor, and develop the developed toner particles on the photoconductor. Collected and measured toner particle size distribution, 8μ
It was found that there are many toner particles of m or less, especially toner particles of about 5 μm on the latent image of minute dots. That is,
When toner particles having a particle size of about 5 μm are smoothly supplied to the development of a latent image on a photoconductor, the toner image is faithful to the latent image, and an image with truly excellent reproducibility can be obtained without protruding from the latent image. Is.

This is related to the necessity of the presence of toner particles having a particle size of about 5 μm described above, but toner particles having a particle size of 5 μm or less certainly have the ability to faithfully reproduce a minute dot latent image. However, the cohesiveness itself is considerably high, which may impair the fluidity of the non-magnetic toner.

The present inventors have aimed to improve the fluidity by adding a fluidity improver for the purpose of improving the fluidity,
It was difficult to satisfy all the items such as image density, toner scattering, and fog. Therefore, the present inventor further studied the particle size distribution of the toner, and after containing 15 to 40% by number of toner particles having a particle size of 5 μm or less,
It was found that the fluidity can be further improved and the image quality can be improved by including 0.1 to 5.0% by volume of the toner particles having a size of 16.0 μm. That is, it is considered that the toner particles in the range of 12.7 to 16.0 μm have appropriately controlled fluidity with respect to the toner particles of 5 μm or less, and as a result, even when copying or printing is continued, high density is achieved. A sharp image having excellent resolution and gradation is provided.

Further, the present inventors have examined the state of the particle size distribution and the developing characteristics, and found that there is a state of existence of the particle size distribution suitable for achieving the most object as shown by the above formula for the toner particles of 6.35 to 10.1 μm. I also found out.

That is, when the particle size distribution is adjusted by general wind force classification, the fact that the value of the above equation is large means that the toner particles of about 5 μm that faithfully reproduce the minute dot latent image increase and that the value is small, on the contrary. It is understood that this indicates that the toner particles of about 5 μm are reduced.

Therefore, when v is in the range of 6 to 10 μm and the above relational expression is further satisfied, even better toner fluidity and faithful latent image reproducibility are achieved.

For toner particles with a particle size of 16 μm or more, 1.0
It is preferably not more than the volume% and as small as possible.

A more detailed description will be given. Toner particles having a particle diameter of 5 μm or less are preferably 15 to 40% by number, more preferably 20 to 35% by number based on the total number of particles. 15% of toner particles having a particle size of 5 μm or less
When it is less than 1, the number of toner particles effective for high image quality is small, and in particular, as the toner is used by continuing copying or printing out, the effective toner particle component is decreased, and the non-magnetic particles as shown in the present invention are reduced. The balance of the particle size distribution of the component type color toner deteriorates, and the image quality may gradually deteriorate. On the other hand, if it exceeds 40% by number, the toner particles are likely to aggregate with each other, and the toner particles having a particle size larger than the original particle size are likely to be formed, resulting in a rough image quality, a decrease in resolution, or a latent image. The density difference between the edge portion and the inside becomes large, and the image tends to be hollow.

The content of the toner particles in the range of 12.7 to 16.0 μm is preferably 0.1 to 5.0% by volume, preferably 0.2.
~ 3.0% by volume is good. When the content is more than 5.0% by volume, the image quality is deteriorated, and more than necessary development, that is, excessive toner excess occurs, resulting in an increase in toner consumption. On the other hand, if it is less than 0.1% by volume, the image density may decrease due to the decrease in fluidity.

Further, the content rate of toner particles having a particle size of 16 μm or more is 1.
It is preferably 0% by volume or less, more preferably 0.6% by volume or less, and if it is more than 1.0% by volume, it not only hinders the reproduction of fine lines, but also the toner particles developed on the photoconductor at the time of transfer. Rough toner particles of 16 μm or more are prominently present on the thin layer surface, making the delicate contact state between the photoconductor and the transfer paper through the toner layer irregular, causing fluctuations in transfer conditions, and transferring It is likely to cause a defective image. Further, the volume average diameter of the non-magnetic one-component color toner is preferably 6 to 10 μm, preferably 7 to 9 μm, and this value cannot be considered in addition to the above-mentioned constituent elements. If the volume average particle size is less than 6 μm, the problem that the amount of toner adhered on the transfer paper is small and the image density is low is likely to occur in applications where the image area ratio is high such as a graphic image. It is considered that this is due to the same reason as the reason why the internal density is lowered with respect to the edge portion in the latent image described above. If the volume average particle size is 10 μm or more, the resolution is not good, and if the use is continued at the beginning of copying, the image quality is likely to deteriorate.

The particle size distribution of the toner can be measured by various methods, but in the present invention, it was measured using a Coulter counter.

That is, as a measuring device, Coulter Counter TA-II
Type (manufactured by Coulter) and connected to an interface (manufactured by Nikkaki) and a CX-1 personal computer (manufactured by Canon) that outputs a number distribution and a volume distribution, and the electrolyte is 1
Prepare a 1% NaCl aqueous solution using graded sodium chloride.
As a measurement method, 0.1 to 5 ml of a surfactant, preferably an alkylbenzene sulfonate, is added as a dispersant to 100 to 150 ml of the aqueous electrolytic solution, and 2 to 20 mg of a measurement sample is further added.
The electrolytic solution in which the sample is suspended is subjected to a dispersion treatment for about 1 to 3 minutes with an ultrasonic disperser, and a Coulter Counter TA-II type is used to form particles of 2 to 40 μm based on the number by using a 100 μm aperture as an aperture. The particle size distribution was measured and then the value according to the invention was determined.

As the binder substance used in the resin particles containing the non-magnetic colorant of the present invention, various material resins conventionally known as electrophotographic toner binder resins are used.

For example, polystyrene, styrene-styrene copolymers such as styrene-butadiene copolymers, styrene-acrylic copolymers, polyethylene, ethylene-vinyl acetate copolymers, ethylene-copolymers such as ethylene-vinyl alcohol copolymers. , Phenol resin, epoxy resin, acrylic phthalate resin, polyamide resin, polyester resin, maleic acid resin, and the like. In addition, the manufacturing method and the like of each resin are not particularly limited.

Among these resins, the effect of the present invention is great when a polyester resin having a high negative chargeability is used. That is, while polyester-based resins have excellent fixability and are suitable for color toners, on the other hand, they have a strong negative charging ability and tend to be excessively charged, but when the polyester resin is used in the constitution of the present invention, the adverse effects are improved, and excellent toners are obtained. Is obtained.

In particular, (In the formula, R is an ethylene or propylene group, x and y are each an integer of 1 or more, and the average value of x + y is 2
Is ~ 10. ), A bisphenol derivative or a substitution product represented by the formula (1) is used as a diol component, and a carboxylic acid component consisting of a divalent or higher carboxylic acid or an acid anhydride thereof or a lower alkyl ester thereof (for example, fumaric acid, maleic acid, maleic anhydride, A polyester resin obtained by copolycondensing phthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid and the like is more preferable because it has sharp melting characteristics.

 The measuring method of the present invention will be described below.

(1) Triboelectric charge measurement: The measurement method will be described in detail with reference to the drawings.

FIG. 1 is an illustration of an apparatus for measuring the triboelectric charge amount of toner and external additives. First, a metal measuring container 2 having a screen 3 of 500 mesh on the bottom is used to measure the triboelectric charge amount. A mixture of toner and carrier in a weight ratio of 1:19 or 1:99 in the case of an external additive. The mixture is placed in a polyethylene bottle having a volume of 50 to 100 ml, and shaken by hand for about 10 to 40 seconds, about 0.5 to 1.5 g of the mixture (developer) is put, and the lid 4 made of metal is placed. At this time, weigh the entire measuring container 2 W ₁
(G). Next, in the suction device 1 (at least the portion in contact with the measurement container 2 is an insulator), suction is performed from the suction port 7 and the air volume control valve 6 is adjusted to set the pressure of the vacuum gauge 5 to 250 mmAq. In this state, the toner (or external additive) is suctioned sufficiently, preferably for 2 minutes to remove the toner (or external additive). Electrometer 9 at this time
Is set to V (volt). Here, 8 is a capacitor, and the capacitance is C (μF). In addition, the total weight of the measuring container after suction is weighed and is W ₂ (g). The triboelectric charge amount (μc / g) of this toner (or external additive) is calculated by the following formula.

(However, the measurement conditions are 23 ° C and 60% RH.) The carrier used for the measurement is EFV200 / 300 (Powder Tech Co., Ltd.).

(2) Volume resistivity measurement: A pellet (20 mmφ x 2 to 3 mm thick) was made by pressure molding for 10 t and 30 seconds, and after leaving this pellet for 24 hours in an environmental chamber at a temperature of 22 ° C and a humidity of 55% RH, A volume resistivity meter (TR-8601 HIGH MEGAOHM METER manufactured by Takeda Riken) is used to measure the resistance value by changing the electric field, and the value of 1 kv / cm is read by the data plot.

Next, the image forming method of the present invention will be described by taking the image forming apparatus shown in FIG. 2 as an example, but the present invention is not necessarily limited to this apparatus. FIG. 2 shows an apparatus for developing an electrostatic image formed on a latent image carrier, 10 is a latent image carrier, and latent image formation is performed by electrophotographic process means or electrostatic recording means (not shown). To be done. Reference numeral 11 denotes a toner carrier, which comprises a non-magnetic sleeve made of aluminum or stainless steel. The non-magnetic one-component system color toner is stored in the hopper 12 and is supplied onto the toner carrier 11 by the toner supply roller 13. In the toner supply roller 13, the toner supplied onto the toner carrier 11 after development is uniformly and thinly applied by the toner application blade 14. The contact pressure between the toner applying blade 14 and the toner carrier 11 is 3 to 250 g / cm as a linear pressure in the sleeve generatrix direction.
Preferably, 10 to 120 g / cm is effective. Contact pressure is 3g / cm
If it is smaller, it becomes difficult to apply the toner uniformly, and the charge amount distribution of the toner becomes broad, causing fog and toner scattering. Further, if the contact pressure exceeds 250 g / cm, a large pressure is applied to the toner, so that the toners are aggregated or fused with each other, which is not preferable. By adjusting the contact pressure to 3 to 250 g / cm, it becomes possible to loosen the agglomeration peculiar to the toner having a small particle size, and it is possible to instantly raise the charge amount of the toner. The toner applying blade 14 is preferably made of a triboelectric charging series material suitable for charging the toner to a desired polarity.

In the present invention, silicone rubber, urethane rubber, styrene-butadiene rubber and the like are suitable as the triboelectric material. Further, it is preferable to use a conductive rubber or the like because it is possible to prevent the toner from being excessively charged.

In addition, the toner carrier using the blade proposed in the present invention
In a system in which a thin layer of toner is coated on 11, the thickness of the toner layer on the toner carrier is set to be smaller than the facing gap length between the toner carrier and the latent image carrier in order to obtain a sufficient image density. , It is necessary to apply an alternating electric field to this void.

That is, the bias power source 15 shown in FIG. 2 applies an alternating electric field between the toner carrier 11 and the latent image carrier 10 or a developing bias in which a direct current electric field is superposed on the alternating field to apply a latent image from the toner carrier 11. It is possible to facilitate the movement of the toner onto the image carrier 10 and to form a high quality image.

The present invention will be described in detail below with reference to examples. still,
All percentages and parts are by weight.

Example 1-Polyester resin obtained by condensing propoxylated bisphenol and fumaric acid 100 parts-Phthalocyanine pigment 4 parts-Chromium complex salt of di-tent-butylsalicylic acid 2 parts Preliminary mixing of the above materials with a Henschel mixer Then, the mixture was melt-kneaded at least twice with a three-roll mill, cooled, roughly crushed to about 1 to 2 mm with a hammer mill, and then finely crushed with a fine crusher by an air jet system. Further, the finely pulverized product thus obtained was classified and 2 to 10 µm was selected so as to obtain the particle size distribution of the present invention to obtain non-magnetic colorant-containing resin particles. 100 parts by weight of the obtained colorant-containing resin particles as an external additive having a particle size of 55 mμ and a specific electric resistance of 3 × 10
Cyan toner combined with 0.8 parts acrylic resin particles containing methyl methacrylate unit and polymerizable amino acid compound CCH ₂ ═CH—N (CH ₃ ) —C ₂ H ₄ —CO ₃ H as monomer composition having ¹⁰ Ωcm (Non-magnetic one-component system toner).

This cyan toner has a volume average diameter of 8.0μ 5μ or less 31 number% 12.7 to 16μ 1.7% by volume 16μ or more substantially 0% Met.

At this time, A _L = -30 μc / g, A _H = -19 μc / g, A _L / A _H = 1.58, B _L = + 180 μc / g, B _H = + 45 μc / g, B _L / B _H = 4.0, ( B _L / B _H ) / (A _L / A _H ) = 2.53.

Using this toner, a commercially available plain paper color copying machine (made by Canon Color Laser Copier 500) was remodeled so that the developing device had the structure shown in FIG. At this time, the surface of the toner carrier 11 uses a sleeve (coat layer thickness 10 μ) coated with a phenol resin in which 40 parts by weight of crystalline graphite is dispersed, and the toner supply roller 13 of urethane sponge is rotated and contacted. Toner coating blade
14 is in contact with the toner carrier 11 at a linear pressure of 50 g / cm.

The development conditions are as follows: development contrast 350V, the gap between the toner carrier and the latent image carrier is 300 μm, and 1.8
Applying a developing bias that superimposes an alternating electric field of KHz and 1.5 KVpp, temperature is 20 ° C / humidity 10% RH, temperature is 23 ° C / humidity 60% RH
The durability test of 5,000 sheets was performed under each environment under a temperature of 30 ° C. and a humidity of 80% RH. As a result, no sleeve contamination or sleeve fusion was observed, and a clear image with stable image density of 1.40 to 1.50 and no fog was obtained under each environment.

Furthermore, temperature 23 ℃ / humidity 60% RH, temperature 20 ℃ / humidity 10% RH,
No abnormalities were found in the initial images after being left for 1 month in each environment of temperature 30 ° C./humidity 80% RH.

Example 2 Acrylic resin particles used in Example 1 as an external additive
Image formation was performed in the same manner as in Example 1 except that 0.5 part of 0.5 parts of silica fine powder treated with hexamethyldisilazane (BET specific surface area of 230 m ^{2 /} g) was used. Temperature 20 ° C./humidity 10% RH 1.35 to 1.45 under temperature, 23.degree. C./humidity 65% RH 1.45 to 1.55, 30.degree. C./humidity 80% RH 1.50 to 1.65. Results were obtained.

Example 3 Image formation was carried out in the same manner as in Example 1 except that the surface of the toner carrier was coated with the phenol resin having 40 parts of boron nitride dispersed therein.
Under% RH, it was 1.30 to 1.50, which was slightly lower than that of Example 1, but good results were obtained.

Example 4 Images were printed in the same manner as in Example 2 except that the surface of the toner carrier 11 was coated with a phenol resin having 40 parts of molybdenum disulfide dispersed therein. And sleeve fusion is not seen at all,
The image density was stable at 1.45 to 1.55, and clear images with no fog were obtained.

Comparative Example 1 When image formation was performed in the same manner as in Example 1 except that the acrylic particle external additive was not used, fog occurred at a temperature of 20 ° C. and a humidity of 10% RH, and an image was obtained. The concentration also decreased.

Comparative Example 2 Example 1 except that the same toner as in Example 1 was used and the toner carrier 11 in FIG.
20 ° C / 10% humidity by the same color copier as
An endurance test of 5,000 sheets was conducted under each environment of RH, temperature 23 ° C / humidity 60% RH, temperature 30 ° C / humidity 80% RH.

As a result, sleeve contamination occurred in an environment of a temperature of 20 ° C and a humidity of 10% RH, so the image density that was initially 1.5 was durable.
After 00 sheets, the density dropped to 1.0. Also the temperature 30 ℃
/ In an environment with a humidity of 80% RH, sleeve fusion occurred after 3,000 sheets of durability.

Comparative Example 3 Image formation was carried out in the same manner as in Example 1 except that crystalline resin was not used and only phenol resin was used as the coating resin for the toner carrier. Temperature: 20 ° C./humidity: 10%
The image density decreased from 1.40 to 1.15 with RH.

〔The invention's effect〕

In the present invention, a toner carrier having a resin layer containing solid lubricant fine particles or at least fine particles having a solid lubricant on the surface thereof is brought into contact with a toner supply roller and a toner coating blade so that the toner carrier is non-magnetic. After supplying and coating the component type color toner, a DC / AC superimposed electric field is applied in the developing region between the toner carrier and the latent image carrier facing the toner carrier to form the latent image on the latent image carrier. A non-magnetic one-component color toner used in an image forming method of developing with a magnetic one-component color toner, wherein the non-magnetic one-component color toner has non-magnetic colorant-containing resin particles and an external additive, The additive has a particle size of 20 to 200 mμ and a specific electric resistance of 10 ⁶ to 10
^The nonmagnetic one-component color toner has a volume average particle size of ¹⁴ Ωcm and contains organic resin particles that are charged to the opposite polarity to the nonmagnetic colorant-containing resin particles when frictionally charged with iron powder. 6
˜10 μm, containing 15 to 40% by number of non-magnetic colorant-containing resin particles having a particle size of 5 μm or less, 12.7 to 16.0 μ
The resin particles containing the non-magnetic colorant having a particle diameter of m are 0.1 to 5.0.
Non-magnetic colorant-containing resin particles having a particle size of 16 μm or more are contained in an amount of 1.0% by volume or less, and 6.35 to 10.1
Resin particles containing a non-magnetic colorant having a particle size of Here, V: volume% of non-magnetic colorant-containing resin particles having a particle diameter of 6.35 to 10.1 μm N: number% of non-magnetic colorant-containing resin particles having a particle diameter of 6.35 to 10.1 μm dv: total non-magnetic Since it has a particle size distribution satisfying the volume average particle size of the colorant-containing resin particles, it is strongly attracted to the toner carrier side rather than the non-magnetic colorant-containing resin particles at the initial rubbing of the toner carrier and the toner. Are charged, and the rising of the charging of the toner is promoted,
After once standing up, on the contrary, the toner attracts the colorant-containing resin particles rather than the toner carrier, and functions to neutralize the excessive charge of the toner. Therefore, the toner is a toner having a small particle size having a specific particle size distribution. In addition, the toner can maintain the rising of charge and the saturated charge amount level in a good and stable manner in various environments, and further, the toner particles do not fuse to the surface of the toner carrier to stabilize the clear image characteristics. Can be given.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an apparatus for measuring the triboelectric charge amount of toner in triboelectric charge amount measurement. FIG. 2 is an explanatory diagram showing an example of an image forming apparatus used in the present invention. 1 ... Suction machine 2 ... Measuring container 3 ... Conductive screen 4 ... Lid 5 ... Vacuum gauge 6 ... Air flow control valve 7 ... Suction port 8 ... Condenser 9 ... Electrometer 10 ... Latent image carrier 11 ... Toner carrier 12 ... Hopper 13 ... Toner supply roller 14 ... Toner application blade 15 ... Bias power supply

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G03G 15/08 501 Z 503 Z 504 A 507 L G03G 13/08 (56) Reference JP-A-2 -877 (JP, A) JP-A 2-879 (JP, A) JP-A 1-156764 (JP, A) JP-A 1-281457 (JP, A) JP-A 1-237560 (JP, A) )

Claims (1)

[Claims] 1. A toner supply roller and a toner coating blade are brought into contact with a toner carrier having a resin layer containing solid lubricant fine particles or at least solid lubricant-containing fine particles on the surface thereof to make the toner carrier non-magnetic. After supplying and applying the one-component color toner, a DC / AC superposition electric field is applied in the developing area between the toner carrier and the latent image carrier facing the toner carrier to form a latent image on the latent image carrier. In the non-magnetic one-component color toner used in the image forming method of developing with the non-magnetic one-component color toner, the non-magnetic one-component color toner has non-magnetic colorant-containing resin particles and an external additive, The external additive has a particle size of 20 to 200 mμ and a specific electric resistance of 10 ⁶ to 10 ¹⁴
The non-magnetic one-component color toner has a volume average particle size of 6 and has an organic resin particle having a polarity of Ωcm and having a polarity opposite to that of the non-magnetic colorant-containing resin particle when triboelectrically charged with iron powder. ~
Non-magnetic colorant-containing resin particles having a diameter of 10 μm and a particle diameter of 5 μm or less are contained in an amount of 15 to 40% by number, and 12.7 to 16.0 μm.
The non-magnetic colorant-containing resin particles having a particle size of 0.1 to 5.0% by volume are contained, and the non-magnetic colorant-containing resin particles having a particle size of 16 μm or more are contained at 1.0% by volume or less, 6.35 to 10.1 μm.
The non-magnetic colorant-containing resin particles having a particle size of m are Here, V: volume% of non-magnetic colorant-containing resin particles having a particle diameter of 6.35 to 10.1 μm N: number% of non-magnetic colorant-containing resin particles having a particle diameter of 6.35 to 10.1 μm dv: total non-magnetic A non-magnetic one-component color toner having a particle size distribution satisfying the volume average particle size of the colorant-containing resin particles.