JPS60195553A - Positively triboelectrifiable toner composition - Google Patents

Abstract

PURPOSE:To obtain a positively triboelectrifiable toner independent of toner/carrier ratio and change of the total developer amt., superior in durability, such as successive use characteristics, and stable against environmental change, such as from high temp. and high humidity to low temp. and low humidity, by incorporating a specified pigment obtained by converting a dye into a lake in a binder resin. CONSTITUTION:A lake pigment represented by the formula (R1, R2, R4, R5 are each independently H, OH, or lower alkyl optionally substd. by alkoxy, R3, R6, R7 are each independently H, OH, phenyl or lower alkyl both optionally substd. by alkoxy, and A<-> is an anion), can be incorporated in a toner binder resin, such as polystyrene or styrene-butadiene copolymer, by adding it in the inside of a developer or to its outside, and in the former method, an amt. of lake pigment to be added is 0.1-50pts.wt. per 100pts.wt. of the resin, and in the case of outside addition, 0.01-40pts.wt. per 100pts.wt. of the resin. As a colorant, carbon black, dyes, and pigments can be used for this toner, and when needed, a fluidity improver, such as silica or alumina are added.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positively chargeable toner composition used in electrophotography.

Conventionally, developing methods for electrophotography, electrostatic recording, etc. are broadly classified into dry developing methods and wet developing methods. The former is
The method is further divided into two types: a method using a two-component developer and a method using a -component developer.

Two-component developing methods include a magnetic brush method using an iron powder carrier, a cascade method using a bead carrier, a fur brush method using fur, etc., depending on the type of carrier for conveying the toner.

Among the one-component developing methods, there is the 4' Udak 2 Ud method, in which toner particles are used in a sprayed state.

A contact development method (also called contact development: or toner development) in which toner particles are developed by bringing them into direct contact with an electrostatic latent image surface, and a method in which toner particles are charged without being brought into direct contact with an electrostatic latent image surface. There are a jumping development method in which the electrostatic latent image is caused to fly toward the latent image surface by an electric field, and a magnetry method in which magnetic conductive toner is brought into contact with the electrostatic latent image surface for development.

In the two-component development method, a mixed developer of carrier particles and toner particles is inevitably used, and as the development process progresses, ? ) Since the carrier particles are consumed at a smaller rate than the carrier particles, the mixing ratio of the two changes, resulting in fluctuations in the concentration of the image forming material, and also due to long-term use of the carrier particles, which are difficult to consume. It inherently has drawbacks such as deterioration of image quality due to deterioration.

On the other hand, in -component-based development methods, the MagneDry method using magnetic toner and the contact development method that does not use magnetic toner, the toner is applied indiscriminately to the entire surface of the surface to be developed, that is, the image area and the non-image area. Because of this, the toner tends to adhere even to non-image areas, resulting in so-called smudging and staining. This was a drawback). or,
/? Even in the Tauder cloud method, it is unavoidable that toner particles in a toner state adhere to non-image areas, and similarly, the toner cloud method has the drawback that the toner particles cannot be removed.

In this regard, JP-A-54-43027, JP-A-55-
18656, etc., an electrostatic image carrier that holds an electrostatic image on its surface and a toner carrier that carries an insulating toner on its surface are arranged with a certain gap in a developing section, and the toner is A method of carrying a toner on a toner carrier to a thickness thinner than the gap, and transferring the toner to the electrostatic image carrier in a developing section for development, is such that in the non-image area where there is no electrostatic charge, the above-mentioned capri is It has the advantage of being hard to come out.

Furthermore, since no carrier particles are used, there is no variation in the mixing ratio as described above, and there is no deterioration of the carrier particles, resulting in an electrostatic image developing method with high fidelity and stable image quality. However, a problem with this method is that the toner layer on the toner carrier must be uniform; otherwise, density unevenness and texture will occur in the image, resulting in an unsightly image. Therefore, in order to improve the transportability of the toner on the toner carrier, magnets are placed in the toner carrier to use toner containing a magnetic material. Although a layer coat can be obtained relatively stably, 1. fixing performance deteriorates because the toner contains a magnetic material.

Problems such as increased susceptibility to the photoreceptor and deterioration of the hue of the chromatic toner may occur.

Therefore, an electrostatic image carrier that holds an electrostatic image on its surface and a toner carrier that carries toner on its surface are arranged with a certain gap in the developing section, and the saturation magnetization in the external magnetic field 50000a is 10 @ A developing method may be considered in which a toner of rnu/11 or less is supported on a toner carrier to a thickness 4 thinner than the gap, and the toner is transferred to the electrostatic holder in a developing section.

With this method, not only can the advantages of one-component jumping development be utilized with respect to development, but also the toner can be neatly coated on the toner carrier regardless of the presence or absence of a magnetic substance in the toner. However, due to changes in the total amount of developer, it may not always be possible to uniformly charge the toner, and this tends to cause poor toner coating conditions.

Further, as the positive charge control agent used in such a toner for dry development, there are generally, for example, a quaternary ammonium compound and an organic dye, particularly a basic dye and its salt.

Common positive charge control agents include benzylmethyl-hexadecyl ammonium chloride, decyl-trimethyl ammonium chloride, nigrosine base, nigrosine, zafranin gamma, and crystal violet. In particular, nigrosine base and nigrosine are often used as positive charge control agents. These are usually added to thermoplastic resins, thermally melted and dispersed, and then finely pulverized and adjusted to a suitable particle size as necessary before use.

However, these dyes used as charge control agents have complex structures, inconsistent properties, and poor stability. In addition, decomposition 1 mechanical impact during hot kneading.

It is susceptible to decomposition or deterioration due to friction, changes in temperature and humidity conditions, etc., and tends to cause a phenomenon in which charge controllability deteriorates.

Therefore, when a toner containing these dyes as a charge control agent is developed using a copying machine, the charge control agent may decompose or change in quality as the number of copies increases, which may cause deterioration of the toner during durability. .

Further, most of the substances generally known to be positively chargeable have a dark color, and therefore have the disadvantage that they cannot be incorporated into a bright chromatic developer.

Furthermore, since it is extremely difficult to uniformly disperse these positive charge control agents in a thermoplastic resin, they have the fatal drawback of causing a difference in the amount of frictional charge between toner particles obtained by pulverization. are doing. For this reason, various methods have been used to achieve more uniform dispersion. For example, basic nigrosine dyes are used by forming salts with 9th grade higher fatty acids to improve compatibility with thermoplastic resins, but often unreacted fatty acids or salt dispersion products are used.
It is exposed on the surface of the toner and contaminates the carrier or toner carrier, causing a decrease in the fluidity of the toner, fogging, and a decrease in image density. Alternatively, in order to improve the dispersion of these charge control agents into the resin, a method has also been adopted in which charge control agent powder and resin powder are mechanically pulverized and mixed in advance and then hot melt-kneaded. but,
The inherent poor dispersion cannot be avoided, and the current situation is that sufficient uniformity of charge has not yet been achieved for practical use.

In addition, many positive charge control agents are hydrophilic, and in order to disperse them into these resins, when melted, kneaded, and pulverized,
The dye is exposed on the toner surface. Therefore, when the toner is used under high humidity conditions, it has the disadvantage that a solid image cannot be obtained because these charge control agents are hydrophilic.

In this way, when a conventional positive charge control agent is used in a toner, the toner particle surface is affected between toner particles, between a toner and a carrier, or between a toner and a toner carrier such as a sleeve. This results in variations in the amount of charge generated, and problems such as development capri, toner scattering, and carrier contamination are likely to occur.

Furthermore, this problem appears as a remarkable phenomenon when a large number of copies are made, and the result is that the copying machine is not suitable for use in practical applications.

Furthermore, under high humidity conditions, the transfer efficiency of toner images decreases significantly, and many of them become unusable. Even at room temperature and humidity, when the toner is stored for a long period of time, it often deteriorates and becomes unusable due to the instability of the positive charge control agent used. The object of the present invention is to provide a positively chargeable toner which has improved the above-mentioned drawbacks.

That is, an object of the present invention is to provide a positively chargeable toner that is less dependent on changes in the toner to carrier ratio, the total amount of developer, and the like.

That is, an object of the present invention is to provide a positively chargeable toner having excellent durability such as continuous use characteristics.

Another object of the present invention is to provide a positively chargeable toner that is stable against environmental changes such as high temperature and high humidity, and low temperature and low humidity.

That is, the present invention is a positively chargeable toner composition characterized in that the binder resin contains a pigment obtained by turning a dye represented by the following general formula into a lake.

However, in the formula, R4, R2, R4, and R5 are each independently hydrogen.

A-
represents an anion.

Examples of dyes used in the present invention include the following.

(10) Lake formation of the above dye is carried out by a known method.

For example, a laked pigment is precipitated by adding an aqueous solution of a lake agent to an acetic acid solution of a dye. Alternatively, the extender pigment is suspended in an acetic acid aqueous solution of the dye, and then an aqueous solution of a lake forming agent is added to deposit the lake pigment on the surface of the extender pigment. The lake pigment is filtered, washed with water, and then dried. Examples of the lake forming agent include water-soluble salts of syntungsten molybdic acid, phosphotungstic acid, phosphomolybdic acid, and water-soluble salts containing complex anions such as ferrocyan and ferricyan.

Organic acid salts can also be used as lake forming agents, but gallic acid lakes, for example, do not have very good charging properties. This is thought to be because, in the case of an organic acid lake, since the resin and the lake have good compatibility, the property of the resin having poor charging characteristics becomes noticeable.

The developing method using the toner composition of the present invention includes:
An electrostatic image carrier that holds an electrostatic image on its surface and a toner carrier that carries toner on its surface are arranged with a certain gap in the developing section, and the toner with a saturation magnetization of 106mu711 or less in an external magnetic field of 50000e is A preferred developing method is to carry the toner on a toner carrier to a thickness that is thinner than the gap p, and to transfer the toner to the electrostatic holder in a developing section.

The inventors of the present invention have studied various conventionally known non-magnetic or weakly magnetic toners using the above-described development method. It has been found that more precise control of the amount of electrostatic charge held by the toner on the toner carrier is important in this field. In other words, in a developing method using an insulating non-magnetic toner, for example, if the amount of charge is low, the toner will not be uniformly applied on the toner carrier, and of course development will not be possible. Even if you create conditions for application, if the value is not appropriate, the background fog will be too strong, and conversely, if the value is too high, the electrostatic attraction with the toner carrier will be too strong and the toner will become static. It is difficult to transfer to the image carrier, resulting in a decrease in image density and the appearance of a low-quality image. Furthermore, for the same reason, the quality of images is greatly affected by changes in toner charge amount due to repeated use or environmental changes. Therefore, it is extremely important to ensure the stability of the amount of charge. In addition, the physical adhesion force between the toner and the toner carrier obviously affects the transfer of the toner from the toner carrier. If the density is high, the image density will be low, resulting in a low-quality image with low resolution.
Preventing the increase in physical adhesion is also extremely important.As a result of intensive research, the present inventors found that electrophotographic toners exhibiting various excellent characteristics when toners contain lake pigments as described above. was found to be obtained. Furthermore, we have found that it is very effective to apply this developer to the above-mentioned developing method.

In other words, toner containing lake pigment has high triboelectric charging properties and good durability against repeated continuous copying, and when applied to the above development method, it is stable even under high temperature and high humidity environments, and low temperature and low humidity environments. It has become possible to take out high-quality images over a long period of time.The method of incorporating the lake pigment into the toner in the present invention is divided into a method of adding it inside the developer and a method of adding it externally. When internally added, the content of the control agent is 100% of the resin.
With respect to wt%, a range of 01 to 50 wt is desirable, and a range of 0.5 to 20 wt is particularly desirable. In addition, when adding externally, 0.01 to 40 w per 100 wt% of resin.
It is desirable that the content be 0.05% to 10% by weight, particularly preferably 0.05 to 10% by weight.

As the binder resin for toner used in the developing method of the present invention, various material resins conventionally known as toner binder resins for electrophotography are used.

For example, styrene copolymers such as polystyrene, polystyrene/butadiene copolymer, styrene/acrylic copolymer, /liethylene, polyethylene/hinyl acetate copolymer,
These include ethylene copolymers such as polyethylene vinyl alcohol copolymers, phenolic resins, epoxy resins, allyl 7-thalerate resins, polyamide resins, polyester resins, maleic acid resins, and the like. Furthermore, there are no particular restrictions on the manufacturing method of any of the resins. Conventionally, resins produced by emulsion polymerization or the like tend to contain impurities and are difficult to use, but the present invention makes them easier to use, and the range of resin selection is greatly expanded. This is also a great effect of the present invention.

As the coloring material used in the toner of the present invention, conventionally known coloring materials include colorants such as Colorants such as black, dyes, and pigments can be used.

Further, a fluidity improver such as silica or alumina may be added to the toner if necessary.

When it is desired to obtain a magnetic toner, magnetic fine particles may be added to the toner. The magnetic substance exhibits magnetism, but any material that can be magnetized may be used, such as iron.

Examples include manganese, nickel, cobalt, chromato metals, magnetite, various ferrites, manganese alloys, and other ferromagnetic alloys, and fine powders of these metals can be used.

Hereinafter, the usage mode of the toner of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an example of an embodiment of an electrostatic latent image developing method and a developing device using an insulating toner. In the figure, reference numeral 1 denotes a cylindrical electrostatic image carrier, on which an electrostatic latent image is formed by, for example, the Carlson method or the NP method, which are known electrophotographic methods, and the image is stored in a hopper 3, which is a toner supply means. The insulating toner 5 is applied onto the toner carrier 2 by a coating means 4 that controls the thickness of each toner layer, and the toner 5 is used for development.

The toner carrier 2 is a cylindrical developing row 2 made of stainless steel. Aluminum or other metals may be used as the material for this developing lawn. Alternatively, a metal roller coated with resin or the like may be used in order to frictionally charge the toner to a desired polarity. Additionally, the developer roller may be made of an electrically conductive non-metallic material. Although not shown, spacer rollers made of high-density polyethylene are inserted into the shafts of the toner carrier 20 at both ends thereof. By applying the rollers to both ends of the electrostatic image holder 1 (and fixing the developing device), the distance between the electrostatic image holder 1 and the toner carrier 2 is adjusted to the top of the toner carrier 2. The distance is set to 1 and held at a value greater than the thickness of one layer of applied toner.This interval is, for example, 100μ to 500μ, preferably 15
It is 0μ to 300μ. If this distance is too large, the toner generated by the electrostatic latent image on the electrostatic image carrier 1 will not be as strong as the non-magnetic toner applied on the toner carrier 2, and the electrostatic force will become weaker.
The image quality deteriorates, and it becomes particularly difficult to visualize horizontal lines through development. Further, if this distance is too narrow, there is a great risk that the toner applied on the toner carrier 2 will be compressed and aggregated between the toner carrier 2 and the electrostatic image carrier l. Reference numeral 6 denotes a developing bias power source, which is capable of applying a voltage between the conductive toner carrier 2 and the back electrode of the electrostatic image holder 1. This developing bias voltage is
The developing bias voltage is as described in No. 8.

FIG. 2 is another example of the embodiment. In the same figure, 1
2 is an electrostatic image carrier, 2 is a toner carrier, 5 is the toner specified in the present invention, 3 is a cleaning blade, 1o is a toner supply member, t016 is a vibration member, 17
16a is a permanent magnet, 16b is a support spring, 17m is a core, and 17b is a winding wire. By applying an alternating current to the winding i1!17b, the vibrating member 16 is vibrated at an appropriate amplitude frequency to form a uniform toner coating layer on the toner carrier 2 during the constant rotation i, and the toner carrier 2 and the static The electrostatic image holder 1 is placed in opposition to the electrostatic image carrier 1 while maintaining a large gap due to the thickness of the toner coating layer, and the non-magnetic toner is flown onto the electrostatic image to develop it.

The vibration of the vibrating member 16 may be at any level as long as it does not cause liquid to flow directly onto the toner carrier 2, but it is preferable to control the frequency and amplitude so that the toner coating layer has a uniform thickness of about 5 to 100 μm. It is also possible to apply an alternating current and/or direct current developing bias voltage between the toner carrier 2 and the electrostatic image holder l.

FIG. 3 is another example of the embodiment. In the figure, 1 is an electrostatic image carrier, 2 is a toner carrier, 3 is a developer container, 5 is an insulating toner specified in the present invention, 6 is a development bias power source, 9 is a toner cleaning member, 35 is an application roller, 3
6 is fixed to the surface of the toner carrier 2, and 7' (fiber brush; 40 is a bias power supply for coating).The toner 5 is uniformly coated on the toner carrier 2 by rotating the coating roller 35 and conveyed by the brush 36. It is developed by flying the toner onto the electrostatic image on the electrostatic image holder 1. The gap between the toner carrier 2 and the application roller 35 is adjusted so as to form a uniform layer of toner of about 5 to 100 μm on the toner carrier 2. However, in order to uniformly apply toner, a bias voltage may be applied by a coating bias power source 4o.

The gap between the electrostatic image carrier 1 and the toner carrier 2 may be made larger than the thickness of the toner, and a developing bias power source 6 may be applied during development.

FIG. 4 is another example of the embodiment. In the figure, 1 is an electrostatic image carrier, 2 is a toner carrier, 5 is the monocomponent toner specified in the present invention, 43 is a developer, 4B is a magnetic roller,
49 is the non-magnetic sleeve, 50 is a magnet, 52 is a magnetic brush, and 53 is a one-component toner or a two-component developer in which the toner and a magnetic carrier are mixed. Non-magnetic sleeve 4
By rotating the sleeve 49, which is made of a brush by holding a magnetic carrier on the magnetic carrier 9, the toner or developer 53 is drawn up by the carrier brush and is applied in contact with the toner carrier 2, thereby forming a uniform layer of toner. 5
form. At that time, the carrier is magnetically
Since it is held on the toner carrier B, it does not move onto the toner carrier 2. Next, the toner is developed by flying from above the toner carrier 2 onto the electrostatic image holder 1. The gap between the magnetic roller 48 and the toner carrier 2 is adjusted so that the thickness of each layer of toner on the toner carrier 2 is about 5 to 100 μm. The gap between the toner carrier 2 and the electrostatic image carrier 1 may be set to be larger than the thickness of the toner, and a developing bias voltage may be applied to the toner carrier 2.

FIG. 5 is a diagram showing another example of the embodiment.

In the figure, l is an electrostatic image carrier, 2 is a toner carrier, and 3 is a toner carrier.
6 is a developing device) 4 is a power source, 5 is a monocomponent toner specified in the present invention, 50 is a fixed magnet, 52 is a magnetic brush made of a carrier toner mixture, and 58 is a blade for regulating toner thickness. The magnetic brush 52 formed on the toner carrier 2 is circulated by rotating the toner carrier 2, and the toner in the hora-gu-3 is poured in to form a uniform thin layer coating on the toner carrier 2. . Next, the toner carrier 2 and the electrostatic image carrier 1 are opposed to each other with a larger gap due to the thickness of the toner, so that the one-component toner 5 on the toner carrier 2 flies onto the electrostatic charge image on the electrostatic image carrier 1. Develop. The thickness of one layer of toner is controlled by the size of the magnetic brush 52, that is, the amount of carrier, and the regulating blade 58.

The gap between the electrostatic image carrier 1 and the toner carrier 2 may be made larger as the toner is thicker, and a developing bias may be applied from the bias power source 6.

Example 1 A toner (average particle size: 1 μm) having the following composition was prepared.

On the other hand, 100 parts by weight of liquefied zinc, 20 parts by weight of styrene-butadiene copolymer, n-! A mixture consisting of 40 parts by weight of methyl methacrylate, 120 parts by weight of toluene, and 4 parts by weight of a 1% methanol solution of rose pen was dispersed and mixed in a ball mill for 6 hours. This was applied to a 0.05 m thick aluminum plate using a wire spar so that the dry coating thickness was 40 μm, and the solvent was evaporated with hot air to produce a zinc oxide binder photoreceptor in the form of a drum. -6kV to this photoreceptor
After corona discharge was performed to uniformly charge the entire surface, an original image was irradiated to form an electrostatic latent image. The toner was placed in a developing device as shown in FIG. 1, and the electrostatic latent image formed above was developed. In this case, the toner carrier 2 is a stainless steel cylindrical sleeve with an outer diameter of 50 cm, and the distance between the photosensitive drum surface and the sleeve surface is set to 025-, and the sleeve has a diameter of 400 mm.
An alternating current of z 1000 V and a direct current bias of -150 μ were applied.

Next, the powder was transferred while irradiating a direct current corona of 17 kV from the back side of the transfer paper to obtain a copied image. Fixing was carried out using a commercially available plain paper copying machine (trade name: NP-5000, Canon [).

The resulting transferred image had a sufficiently high density, no fogging, no toner scattering around the image, and was a good image with high resolution. Durability was continuously examined using the above toner, and the transferred image after 10,000 copies was also completely dull compared to the initial image. In addition, when the environmental conditions were set to 35℃ and humidity to 35℃, the image density was almost the same as normal temperature and humidity, and there was no fogging or scattering, clear images were obtained, and the durability changed almost immediately up to 10,000 sheets. There wasn't. Next, when a transferred image was obtained at a low temperature and low humidity of 10° C. and 10 inches of humidity, the image density was high, even the black areas were developed and transferred extremely smoothly, and the image was excellent with no scattering or hollow spots. Under these environmental conditions, continuous and open copies were made and the density fluctuation was ±0 up to 910,000 sheets.
．． 2, which was sufficient for practical use.The toner of Example 1 was put into the apparatus shown in FIG. When the toner carrier 2 and the electrostatic image holder 1 are rotated at a speed of about 300 sec, a uniform toner coating layer with a thickness of about 50 μm is formed on the toner carrier 2 and the electrostatic image holder 1 is
A frequency of 100 to several kilohertz + a negative peak value of -660 to - is applied to the toner carrier 2 while maintaining a gap of μ.
Similar good results were obtained when development was performed by applying a bias alternating current electric field of 1200 V and a plus peak value of +400 to +5 oov.

Further, when applying the toner shown in Example 1, the gap between the toner holder 2 and the application roller 35 was set to about 2-1, and the length of the fiber brush 36 was set to about 3-1.
into the developing device shown in Fig. 3, set as
Maintaining the gap between the image carrier and the electrostatic image holder at 300μ, a single layer of toner of about 80μ is formed on the developing roller, and as an AC waveform, the DC component -
Add 250v, peak voltage -700v and +2
00V was applied for development, and similar good results were obtained.

Further, in Example 10, toner 2 (1) was mixed in advance with 20 g of iron powder carrier, and the mixture was put into the developing device shown in FIG. , while maintaining the gap between the developing roller and the electrostatic image holder at 300 μm, a single layer of toner of about 80 μm was formed on the developing roller, and as an AC waveform, a peak value of a voltage with a frequency of 200 Hz ±450 VK and a DC component of −250 V were applied. Similar good results were obtained when developing with peak voltages of -700V and +200V.

Example 2 A toner having the following composition (average particle size: 9 μm) was prepared, placed in the developing device shown in FIG. 1, and carried out in the same manner as in Example 1, with similar good results obtained.

Further, the toner of Example 2 was applied to the toner carrier 2 and the magnetic roller 48.
The maximum thickness of the magnetic brush 52 is approximately 3.
- The toner is placed in the developing device shown in FIG. Frequency 200 Hz Voltage peak value ±450
Adding the DC component -250V to v, the peak voltage value -7
00v and +200v were applied for development, and similar good results were obtained.

Example 3 A toner (average particle size 10μ) having the following composition was prepared,
The sample was placed in the developing device shown in FIG. 1 and developed in the same manner as in Example 1, and similar good results were obtained.

Example 4 A toner (average particle size 10μ) having the following composition was prepared,
When the sample was placed in the developing device shown in FIG.

As explained above, the toner containing the diphenylmethane-based dye lake pigment has 1) high triboelectric charging properties, and 2) no loss of color tone.

Red, brown, etc. toners can be obtained.

Furthermore, an electrostatic image carrier that holds this toner, especially an electrostatic image on its surface, and a toner carrier that carries the toner on its surface are arranged with a certain gap in the developing section, and an external magnetic field 500
A toner with a saturation magnetization of 10 smn or less at 00.00 mm was supported on a toner carrier to a thickness thinner than the gap, and the toner was transferred to the electrostatic holding member in a developing section. (1) It has the advantage of having good durability against repeated continuous copying and being able to produce images with stable image quality over a long period of time.

[Brief explanation of the drawing]

FIGS. 1, 2, 3, 4, and 5 are cross-sectional views showing different forms of the developing device used to carry out the developing method according to the present invention. 1... Electrostatic image holder 2... Toner carrier 3...
Hole/Mother-4... Toner application means 5...-component non-magnetic toner 6... Development bias power supply 9... Toner cleaning blade 1α... Toner supply member 35... Processing roller 236.
・・Fiber brush 40−・Bias power supply for application 48・
...Magnetic roller 49...Nonmagnetic sleeve 50...
Permanent magnet 52...Magnetic brush 53...-component non-magnetic toner or a mixture of it and magnetic carrier 92-component developer 58...Regulation blade Fig. 1 Fig. 2

Claims (1)

[Scope of Claims] A positively chargeable toner composition characterized in that a binder resin contains a pigment obtained by laked dye represented by the following general formula, provided that in the formula R4+R2+R4i5 each independently represents hydrogen, A lower alkyl group which may be substituted with a hydroxyl group or an alkoxy group; A- represents an anion.