JPS63246751A - Nonmagnetic one-component toner - Google Patents

Abstract

PURPOSE:To permit visualization of an electrostatic latent image with high quality by forming a coloring agent of a mixture composed of at least two kinds of pigments of the same color system or different color systems. CONSTITUTION:The coloring agent of a toner contg. a resin which is softened at least by heat and the coloring agent consists of the mixture composed of at least two kinds of the pigments of the same color system or different color systems. More specifically, there is a case in which the use of the pigment is inadequate as the single pigment has the polarity different from the desired polarity of the toner and there is a case in which the color tones are delicately changed when an electrostatic charge quantity is controlled by using a charge quantity control agent if the charge quantity of the pigment is measured. However, the charge quantity over the entire part of the coloring agent is changed by the mixing ratio of the pigments and the polarity can be thereby charged when >=2 kinds of the pigments are mixed. The applicable range of the coloring agents that can be used is thus widened and the toner having the desired color tones is obtd.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides an electrophotographic device or a static WIFlil! The present invention relates to a non-magnetic one-component toner for visualizing an electrostatic latent image formed on a photoconductor or xm body in a recording device.

(Prior Art) In order to visualize an electrostatic latent image formed on an electrostatic image carrier, an image carrier, etc. from an electrophotographic device or an electrostatic recording @C1 photoreceptor or dielectric material, conventional methods have been used. Two-component development consisting of toner and carrier and one-component development consisting only of toner are widely used.

These electrophotographic methods include U.S. Patent No. 2.297゜6
No. 91 specification, Japanese Patent Publication No. 42-23910 (U.S. Patent No. 3.666, 363 specification it), Japanese Patent Publication No. 43-2
4748 (U.S. Pat. No. 4,071,361), U.S. Pat. No. 3,909.258, U.S. Pat. No. 4,12
No. 1,931, No. 2,895,847, No. 3,15
No. 2,012, Special Publication No. 41-947! + No. 45-2
Although many methods are known, such as those described in No. 877 and No. 54-3624, in general, electrical S* is applied to a photoreceptor using a photoconductive material by various means.
The latent image is then developed using toner, and if necessary, the toner image is transferred to a transfer material such as paper, and then fixed by heat, pressure, solvent vapor, etc. to obtain a copy. .

Conventionally, toners used for developing electrostatic images, including various forms of electronic V tactics, are generally prepared by melt-mixing colorants and other additives in a thermoplastic resin and uniformly dispersing the mixture. The solidified material was pulverized and classified to produce colored fine particles of a desired particle size.

This type of toner has been used as a two-component developer together with a fine powder carrier, but this two-component developer has several drawbacks as shown below.

(2) The toner receives a triboelectric charge due to mutual friction between the toner and the carrier, but when used for a long period of time, the carrier surface becomes contaminated with the toner composition and cannot acquire a sufficient charge.

(2) It is necessary to adjust the mixing ratio of the gutter and carrier to a predetermined range, but if used for a long period of time, the mixing ratio will fluctuate and deviate from the predetermined range, making it impossible to obtain good development.

(2) Generally, iron powder or glass beads with oxidized surfaces are often used as carriers, but these carriers mechanically damage the surface of the photoreceptor and shorten its life.

For this reason, various developing methods using a single-component toner consisting only of toner have been proposed.In particular, many developing methods using a toner called magnetic dove containing magnetic powder have been proposed. However, among them,
U.S. Patent Nos. 3,909,258 and 3.1, mentioned above.
A device based on No. 52,012 has been put into practical use. However, these methods also have the following drawbacks. In other words,■ Since magnetic toner with relatively low resistivity is used,
It is difficult to electrostatically transfer the developed image on the electrostatic latent image to a support member such as plain paper, and in particular, sufficient transfer cannot be obtained in a humid atmosphere.

■ Since the toner contains a large amount of magnetic powder, it is not possible to obtain color toners other than dark colors.

For this reason, recently, an imaging method using a single-component toner that does not contain magnetic powder and has a high specific resistance has been proposed. As such an imaging method, for example, the above-mentioned U.S. Patent No. 2,
No. 895,847, No. 3,152,012, Special Publication No. 41-9475, No. 4-2877, No. 54-36
Examples include those based on the touchdown method, impression method, and jumping method described in No. 24 and the like.

However, even when such a -component toner is used, various problems arise as described below.

■ When using such toner, lI! The friction layer becomes insufficiently charged. That is, l! between the toner and the toner carrier. ! In tribocharging, the tribocharging time is short, and the amount of charge required to visualize the image cannot be obtained.

(2) It is necessary to apply the toner extremely thinly and evenly on the surface of the toner carrier, but it is difficult to form such an uneven layer. An example of the process of forming this thin layer will be explained with reference to the schematic diagram of FIG. In the figure, the elastic blade 2 is pressed against the carrier 1 at a pressure of 100(]/a1 to 2,500a/am, and the toner 4 in the toner container 3 is conveyed by the rotation of the toner carrier 1. , is applied to the surface of the toner carrier 1 extremely thinly and evenly by the elastic blade 2.

At this time, in the developing section, toner carrier 1 and static 1! A direct current bias, an alternating current bias, or a bias in which direct current and alternating current are superimposed may also be applied between the image carrier 5 and the surface of the image carrier 5 .

Therefore, the toner carrier 1 is required to have good fluidity and agglomeration resistance. However, while the toner 4 in the toner container 3 is being conveyed by the rotation of the toner carrier 1,
The problem arises that the toner often becomes agglomerated and becomes lumpy, resulting in the toner not being applied to the surface of the toner carrier 1.

■ Furthermore, the toner 4 conveyed by the toner carrier 1 is suddenly subjected to high pressure at the contact area between the elastic blade 2 and the toner carrier 1 due to the blood pressure between the elastic blade 2 and the toner carrier 1, and as a result, frictional heat is generated. This causes the problem that the toner particles 1-4 become soft and stick to the surface of the toner carrier 1, and the toner cannot be applied thinly and evenly.

■Furthermore, the higher the softening point, the higher the fusing temperature.
There also arises the problem that it poses a problem when used in ordinary office copying machines.

■ 3 for each surface area! Although it is necessary to control the triboelectric charge height within a certain range, problems arise with this toner, such as difficulty in adjustment and difficulty in producing a toner with stable performance with good reproducibility.

(Problems to be Solved by the Invention) The present invention has been made in order to solve the various problems as described above.
The amount of triboelectric charge is stable, the distribution of the amount of triboelectricity in rlJ friction is sharp and uniform, there is no development fog, the electrostatic latent image is faithfully formed, and the toner does not scatter around the edges of the latent image. In addition to being able to visualize electrostatic latent images with high quality, at least 62
g! By mixing pigments with different chargeability and optimizing the polarity of the charge amount, it is possible to obtain a color toner with the desired tone, and it is possible to obtain a color toner with a desired tone without adding any additives to control the charge amount. An object of the present invention is to provide a non-magnetic one-component toner having a small amount of charge.

Another object of the present invention is to solve the various problems mentioned above, by attaching positively charged colloidal silica to the outer surface of toner particles, so that the friction band aiffl is stable, the distribution of the friction charge is sharp and uniform, and the development To provide a positively charged nonmagnetic one-component toner capable of making an electrostatic latent image visible with high quality without causing fog, faithfully forming an electrostatic latent image, and without causing toner scattering around the edges of the latent image. With the goal.

[Structure of the Invention] (Means for Solving the Problems) The non-magnetic one-component toner of the first invention includes at least a heat-softened resin and a colorant, wherein the colorant is of the same color or different color. The non-magnetic component toner of the second invention is characterized by comprising a mixture of at least two types of pigments. In the toner containing the positively charged colloidal silica, the triboelectric charge 8 of the toner containing the positively charged colloidal silica is
5tlI of the toner particles? ! ) is characterized by being smaller than the amount of electric charge.

Friction zone fff' of the one-component toner in the present invention? ! !
The load m is 10 to 20 when measured by the blow-off method.
μC/g, when measured by the projection method, a range of 5 to 15 μC/Q is appropriate.

In addition, the measurement values by the above blow-off method were measured under the conditions of room temperature and relative humidity of 50%.
TEEM-200/300 (manufactured by Nippon Tetsuko Co., Ltd.) is mixed with 3% by weight of a coloring agent, for example, a mixture of multiple types of pigments,
Add 1 kg of N2 gas to a 400-mesh conductor network.
/ci, using a plow-off measuring device (TB-20
0: Unit f when measured for 1 minute using Toshiba Chemical Co., Ltd.)
The band per f1fa is shown as [1].

Moreover, the measured value by the projection method is a value obtained as follows. That is, as shown in FIG. 1, at room temperature and 50% relative humidity, the non-magnetic one-component 1-toner 4 sent from the toner container 3 is rotated at 30 to 5 orp- to a toner carrier (for example, the surface is roughened). Ni plating is applied to the surface of the toner carrier (Ni plating applied to the surface of the A1) using an elastic blade (for example made of stainless steel) 2 which is pressed against the surface of the toner carrier at a pressure of 100 to 250 Q/ci. The friction between the elastic blade and the toner gives the toner particles a charge of opposite polarity to the electrostatic image charge. The triboelectrically charged toner particles move to the electrostatic image holder 5, which is rotating in the opposite direction at the same rotational speed C as the toner carrier 1 for one rotation of the toner carrier. At this time, a DC bias of 1200 V is applied between the toner carrier and the surface of the electrostatic image carrier. The amount of charge is expressed as the value obtained by dividing the measured amount of charge on the surface of the electrostatic image carrier by the weight of the transferred toner.

As a developing method using a non-magnetic mono-component toner according to the present invention, for example, a toner carrier carrying a non-magnetic mono-component toner on the surface of an electrostatic latent image carrier that holds an electrostatic latent image on its surface is fixed. The non-magnetic one-component toner is applied onto the toner carrier, and the toner is transferred onto the electrostatic latent image carrier to increase the electrostatic latent on the surface of the electrostatic image carrier. One example is a developing method that visualizes the image.

Examples of the resin used in the non-magnetic one-component toboot of the present invention include polystyrene, poly-P-restyrene,
Monopolymers of styrene and its substituted products such as polyvinyltoluene, such as styrene-P-chlorostyrene copolymers, styrene-propylene copolymers, styrene-vinyltoluene copolymers, styrene-vinylnaphthalene copolymers, Styrene-methyl acrylate copolymer, styrene-
Ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-acrylic octyl copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer , styrene-α-methyl chloromethacrylate copolymer, styrene-acrylonitrile copolymer, styrene-acrylonitrile copolymer, styrene-vinyl methyl ether copolymer, styrene-vinylethyl ether copolymer, styrene-vinylethyl ether copolymer, styrene-vinyl methyl ketone copolymer, styrene-
butadiene copolymer, styrene-isoprene copolymer,
Styrene-acrylonitrile indene copolymer, styrene-maleic acid copolymer, styrene-Nisdel maleate copolymer, etc., and/or polymethyl methacrylate, polybutyl methacrylate, polyvinyl chloride, polyvinyl acetate, polyethylene, polyvinyl pyrene , polyester, polyurethane, polyamide, epoxy resin, polyvinyl butyral, polyacrylic acid resin, rosin, modified rosin, derpene resin, phenolic resin, aliphatic or alicyclic MIA hydrohydride resin, aromatic petroleum resin, chlorinated paraffin, paraffin Waxes and the like can be used alone or in combination, but in particular, in the second invention, waxes have a glass transition point of 50'C or more and a softening point of 110 to 160 degrees Celsius.
℃ copolymers, particularly copolymers of styrene-(meth)acrylic copolymers and monomers having amino groups are suitable. The proportion of styrene in this styrene-(meth)acrylic copolymer is preferably 75 to 85 mol%.

Further, the proportion of the monomer having an amine group in the copolymer is suitably 1.5 to 50 mol%. If it is less than 1.5 mol%, it will be negatively charged, and if it exceeds 50 mol%, problems may arise in moisture resistance. Further, the amide divalent value of the copolymer is preferably 2 to 25b/Q.

The acrylic or methacrylic components used in the synthesis of the above copolymer include acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isopdyl acrylate, pentyl acrylate, hexyl acrylate, heptyl acrylate, and octyl acrylate. Acrylic acid esters such as methacrylic acid and methyl methacrylate, ethyl methacrylic acid and methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate,
All conventionally known acrylic acid and derivatives thereof, methacrylic acid and derivatives thereof, such as methacrylic acid esters such as butyl methacrylate, isobutyl methacrylate, pemble methacrylate, hexyl methacrylate, heptyl methacrylate, and octyl methacrylate, can be used.

As the monomer having an amino group used in the synthesis of the above copolymer, a methacrylic acid derivative represented by the following general formula is suitable.

(However, R3, R4, and R5 are alkyl groups having 1 to 8 carbon atoms, and R6 is an alkylene group having 1 to 8 carbon atoms.) As the t11u form having an amino group represented by the above general formula, for example, 2-dimethylamino- 2-methylpropyl methacrylate, 2-dimethylamino-2-ethylbutyl methacrylate, 2-dimethylamino-2-propylhexyl methacrylate, 2-dimethylamino-2-methylpropyl methacrylate, 2-diethylamino-2-ethylbutyl methacrylate, Examples include 2-diethylamine-2-propylhexyl methacrylate.

In addition, as a mating initiator for copolymerizing a styrene-acrylic copolymer or a styrene-methacrylic copolymer with a mono9 monomer having a 7-mino group, azobis(isobutyronitrile), azobis-2-(2-naphthyl), ) A nitrile initiator typified by propylonitrile can be used.

Further, as the coloring agent used in the present invention, for example, carbon black, Fast Yellow 01 Benzidine Yellow, Pigment Yellow, Indo Fast Orange,
Irgazin Red, Carmine FB, Permanent Bordeaux FRR, Pigment Orange R1 Resole Red 2
Known colorants such as G Rookie Red C10-Damine FB, Rhodamine B Lake, Phthalocyanine Blue, Pigment Blue, Brilliant Green B, Phthalocyanine Green, and Quinacridone are used.

In addition, the non-magnetic one-component toner of the present invention may include, if necessary,
Various additives may be added, such as wax to improve off-resistance properties and charge control agents such as polyamines and nigromines to control triboelectric charge, and hydrophobic silica as a surface treatment agent. or fluoride, etc. may be added internally or externally.

In order to produce the non-magnetic one-component toner of the first invention, first, a resin that softens when heated and a colorant are mixed in a ball mill, V
The mixture is mixed with a mixer such as a type mixer or an S-type mixer, and the resulting mixture is kneaded with a double-arm kneader 1 Miki roll, a co-kneader, a pressure kneader, etc., and the mixed material is processed into a hammer mill,
The toner is roughly pulverized using a pulverizer such as a jet mill or a ball mill, and then classified using an air classifier to obtain a non-magnetic one-component toner having a predetermined particle size. Further, in order to produce the non-magnetic one-component toner of the second invention, positively charged colloidal silica is further added to the toner particles thus obtained, and the mixture and pulverizer are used to mix and pulverize the toner particles. do.

Furthermore, the obtained powder is classified using a wind classifier or the like to obtain toner having a predetermined particle size.

The non-magnetic one-component toner of the present invention has a friction zone T of toner particles.
It is possible to easily control the amount of i, and f! 1il
l is stable between charges, and using the method explained in FIG. 1, a! The friction band rrim distribution is sharp and uniform, and a thin film is formed uniformly on the toner carrier, preventing development fog, faithfully forming a static Ti latent image, and causing toner scattering around the edges of the latent image. It is possible to visualize an electrostatic latent image with high quality without any problems.

(Function) The non-magnetic one-component toner of the first invention is characterized in that it uses a colorant that is a mixture of pigments of the same color or different colors having different charge amounts. In other words, when measuring the amount of charge of a pigment, it may be inappropriate to use it alone because the polarity differs from the polarity of the intended toner, and the charge I
Controlling the amount of charge using a nl control agent may cause a slight change in color tone, but when two or more pigments are combined, the amount of charge will depend on the colorant depending on the mixing ratio of these pigments. The rest band Nm changes and the polarity can be changed. For example, there is a naphthol-based red pigment with a band It ff1-42 μCIQ, which has an extremely good color tone and is desirable as a coloring agent, but its charge amount is negative, which is inconvenient when trying to create a positively charged toner. , bands due to the addition of additives such as charge control agents? It is necessary to adjust the lI, and the original color tone of the pigment may be impaired. However, when this pigment is mixed with a β-oxynaphthoic acid red pigment of 1111 + 40μC10 at a weight ratio of 3:2, the charge amount of the mixture becomes +68μC/a, which is sufficient for use as a colorant for positively charged toners. This effect can be obtained in the same way whether pigments of the same color or different colors are mixed.The same effect can be obtained even when three or more types of pigments are mixed.

Further, the non-magnetic one-component toner of the second invention is one in which hydrophobized colloidal silica having the same polarity as the toner is added, and as the amount of the added amount increases, the friction band W1 charge hammer of the toner is reduced. By adjusting the amount of silica added, the triboelectric charge M of the toner can be easily controlled.

Note that the amount of silica added is different from two or more types of r!
It can be easily determined experimentally from measured values determined by the measurement method of N Charge Company, such as the blow-off method and the projection method. That is, the amount of silica added in the non-magnetic one-component toner of the second invention is ■ (% by weight), and the amount of silica added to the toner no r! When the electric charge of one friction band is Q (μC/J), the relational expression -d Q/d V-α/V α: constant is obtained. Here, for example, the a! of the toner can be obtained from the blow-off method and the projection method. Let the triboelectric charges and constants be Q, , Qp(μC/Q), α, and
By adding mV (Iff1%) of positively charged silica that satisfies the following formula % where α is %, a non-magnetic one-component toner with an optimal amount of silica added can be obtained.

(Example) Next, examples of the present invention will be described.

In addition, the parts in the following examples are parts by weight unless otherwise specified.

Example 1 Negatively charged pigment I (Seika Fast Lead GY; manufactured by Dainichiseika) and positively charged pigment ■ (Fuji Red 5B; manufactured by Fuji Shiroki)
When these were mixed at different mixing ratios, the relationship between the mixing ratio and the charge level as shown in FIG. 2 was obtained.

Next, these negatively charged pigments and positively charged pigment ■ are mixed into 3:
8 parts of this mixture and styrene-n
89 parts of -butyl methacrylate-diethylaminoethyl methacrylate copolymer and 3 parts of wax (660P, manufactured by Sanyo Chemical) were premixed in a ball mill for about 2 hours, and then kneaded in a pressure kneader for about 1 hour.

Next, this kneaded material was cooled and coarsely ground using a hammer mill.

100 parts of this coarsely ground material and hydrophobic silica (RP-130:
Add 5 parts (manufactured by Nippon Aerosil Co., Ltd.) and add vJ! ! The mixture was mixed using a mixer, pulverized using a jet mill, and the pulverized product was classified using an air classification method to obtain a non-magnetic one-component red toner having a 50% weight average diameter of 12.6 μm. This is positively charged toner.

This OPC photoconductor with a negative latent image is used in a commercially available copying machine (product name Nileo Dry 3301 manufactured by Toshiba Corporation! 11), and is supplied to a developing device as shown in Figure 1 for development. As a result, a clear image with no development fog was obtained.

In addition, there is no development fog or decrease in image 111fl1F even under high temperature and high humidity environments (30°C, 85% 1 H).
A clear image with good transfer efficiency was obtained.

Further, even in a low temperature, low humidity environment (5° C., 10% RH), clear images with high density were similarly obtained.

Comparative Example 1 The same procedure as in Example 1 was carried out except that 8 parts of only the negatively charged pigment L was used as the colorant. A five-electron nonmagnetic one-component red toner was prepared. When the characteristics of this toner were investigated, it was found that it did not exhibit sufficient positive chargeability, resulting in problems such as low image density, blurred images, and poor toner supply.

Example 2 A pigment (chromofine cyanine blue 4920SF manufactured by Dainichiseika Chemical Co., Ltd.) and a pigment (chromofine cyanine blue 4920SF manufactured by Dainichiseika Chemical Co., Ltd.), which are both positively charged blue pigments and differ only in band Nm, were used.
920 (manufactured by Dainichiseika) at different mixing ratios, the relationship between the mixing ratio and the band Mm as shown in FIG. 3 was obtained.

Next, pigment material and pigment (1) were mixed at a weight ratio of 4=1, and 4 parts of this mixture, 96 parts of polyester resin, and 1 part of hydrophobic silica (R-972: manufactured by Nippon Aerosil Co., Ltd.) were used to create an example. A negatively charged nonmagnetic one-component blue toner was obtained in the same manner as in Example 1. When an image was created from this in the same manner as in Example 1 using an OPC photoreceptor with a positive latent image, a clear image without development fog was obtained.

In addition, even under high temperature, high humidity environments and low temperature, low humidity environments, there is no development fog or decrease in image density, and development faithful to the latent image can be performed as in normal temperature and normal humidity environments. Moreover, the transfer efficiency was also impaired.

Comparative Example 2 A negatively charged non-magnetic one-component blue toner was prepared in the same manner as in Example 2, except that only 4 parts of positively charged Pigment I was used as the colorant. When the characteristics of this toner were investigated, it was found that it did not exhibit a negative chargeability of 1-minute, developed fog occurred, and problems such as low image density, blurred images, and poor toner supply occurred.

Example 3 Yellow pigment (Pigment Yellow 13-1218: Yamama Shiki Co., Ltd.) and blue pigment (Chromofine Cyanine Blue 4)
920 (manufactured by Dainichiseika) were mixed at different mixing ratios and the amount of charge was measured, and results showing the same tendency as the graph shown in FIG. 2 were obtained.

Next, these yellow pigments and b color pigments were mixed at a weight ratio of 3:2, and using 8 parts of this mixture, a positively charged nonmagnetic one-component green toner was obtained in the same manner as in Example 1. As a result of investigating the characteristics, clear images with no development fog were obtained.

Example 4 Styrene-n-butyl methacrylate-diethylaminoethyl methacrylate copolymer (To: 12.0°C, softening point 122°C (R88 method), number average intermolecular distance 930G, m
m average molecule fi181000) 88 parts, phthalocyanine blue 8 parts, wax (660P: manufactured by Sanyo Kasei) and obi ¥iv1 illumination agent (P-51: manufactured by Orient Chemical) 1
The mixture was preliminarily mixed in a ball mill for about 2 hours, and then kneaded in a pressure kneader for about 1 hour.

Next, this mixed material was cooled and coarsely pulverized using a hammer mill.

Next, 100 parts of this coarsely ground material and a regular obi? 1mJ Lloyd-like silica (RP-130: manufactured by Nippon Aerosil Co., Ltd., charger◆1
The amount of 80μC10) added was varied from 0 parts to 15 parts to prepare three or more mixtures with different amounts of silica added, which were mixed using a type mixer, pulverized using a jet mill, and pulverized. The material was classified by an air classification method to obtain a non-magnetic one-component toner having a 50% weight average particle size of 12.6 μm.

Next, this kneaded material was cooled and coarsely ground using a hammer mill.

Next, 100 parts of this coarsely ground material and positively charged colloidal silica (RP-130: manufactured by Nippon Aerosil Co., Ltd., charged fi + 18
By changing the amount of 0μC10) added in the range from 0 parts to 15 parts, three or more types of mixtures with different amounts of silica added were made by J, mixed with a ■ type mixer, finely pulverized with a jet mill, The pulverized product was classified by an air classification method to obtain a non-magnetic one-component toner having a 50% weight average particle size of 12.6 μm.

The *multibanded l1RrR content of these toners measured by the blow-off method and the projection method was as shown in FIG.

From Fig. 4, the friction zone m obtained by the two different methods mentioned above
The point where the amount of charge was equal was defined as the appropriate value. Therefore, the appropriate silica addition m for the toner composition in this example is 5.4 parts of silica per 100 parts of coarsely ground material. Note that the cold charge amount of silica alone and toner without silica added by the blow-off method is +180 (μ
Cl0) and +40°3 (μC/Q).

Thereafter, a mixture of 100 parts of the coarsely pulverized material and 5.4 parts of silica was mixed, finely pulverized, and classified as described above, and the obtained non-magnetic one-component toner was used to commercially produce an OPC photoreceptor with a negative latent image. A modified Copy IN (trade name: Nileo Dry 3301 manufactured by Toshiba Corporation) was used, and the image was developed by supplying it to the developing device shown in FIG. 1 to obtain a clear image with no development fog.

In addition, even under a high temperature and high humidity environment (30° C., 85% RH), there was no development fog, and a clearer image with higher transfer efficiency was obtained without any decrease in image density.

Furthermore, even in a low temperature, low humidity environment (5° C., 10% RH), clear images with high density were similarly obtained.

Furthermore, when this image was fixed with a heat roll fixing device, both fixation and offset were good in the range of 170° C. to 220° C., and an image of the same quality was obtained even after 10,000 sheets were printed.

Comparative Example 4 A non-magnetic one-component toner was prepared in the same manner as in Example 1 using a mixture of 1 GG part of coarsely pulverized material and 1.0 part of silica having the same composition as in Example 4, and its characteristics were investigated. Problems such as low image density, blurred images, and poor toner supply occurred.

Comparative Example 5 A non-magnetic one-component toner was prepared in the same manner as in Example 4 using a mixture of 10.0 parts of silica to 100 parts of coarsely pulverized material having the same composition as in Example 4, and its characteristics were investigated. , development fog occurred, and the latent image was scattered around the edges.

Examples 5 to 7 Mixtures having the compositions of resins, colorants, additives, and charge control agents shown in the following table were prepared in the same manner as in Example 4 (
! After mixing, kneading, and coarsely pulverizing, the silica addition m was defined as an appropriate value at a point where the friction zone ffi charge port of the toner measured by the blow-off method and the projection method is equal.

Thereafter, a non-magnetic one-component toner obtained by mixing, finely pulverizing and classifying the coarsely pulverized material 1001 and a specified m portion of silica was developed in the same manner as in Example 4, and in both cases the development fog was observed. No clear images were obtained. Further, even under high temperature, high humidity and low temperature, low humidity environments, there was no development fog, there was no decrease in image density, and images with clearer transfer efficiency were obtained. In addition, both fixing properties and anti-offset properties were as good as in Example 1, and images of the same quality were obtained even after 10,000 copies (hereinafter referred to as margins) * Number of copies per 100 parts of toner particles In Examples 4 to 7, The specified value of silica addition speed is not limited to this value, and a range in the vicinity thereof can also be used. For example, in Example 4, 3, 4 to 7.
4 parts, O to 2.5 parts and 2.5 parts in Examples 5 to 7, respectively.
-1.3 parts and 0 to 3.0 parts similarly good images could be obtained. That is, the non-magnetic one-component toner of the present invention can be obtained in a range of 2.4 parts above the specified value, more preferably ±0.5 parts of the specified value.

[Effects of the Invention] As described above, according to the first invention, the band Mm of the colorant itself changes quantitatively depending on the mixing ratio when mixing colorants made of two or more types of pigments, and the polarity is changed. Since it is possible to convert colorants, by creating a toner using a colorant with an appropriate charge amount through this mixing, it becomes possible to use colorants with different polarities, which was difficult to use in the past. In the case of toners, the range of usable colorants has expanded, and it has become possible to obtain toners with desired color tones.

Further, according to the second invention, increasing the amount of silica added reduces the triboelectric charge of the toner, and the increase or decrease can be stably obtained with good reproducibility, so the amount of silica added can be adjusted. A toner having a desired amount of triboelectric charge can be easily produced. That is, in the toner production, the friction zone M1! Load amount can be controlled. This has extremely high industrial value, such as greatly reducing manufacturing costs, improving product quality control, and making it possible to stably manufacture products with good performance.

[Brief explanation of drawings]

Figure 1 schematically shows the main parts of a developing device that uses non-magnetic single-component toner, and Figures 2 and 3 show the mixing ratio when two types of pigments are mixed, and the mixed pigments. Fig. 4 is a graph showing the triboelectric charge difference measured by the pull-off method and the projection method when varying amounts of positively charged colloidal silica are added to toner particles. It is. 1... Toner carrier 2... Elastic blade 3... Toner container 4... Toner 5... Electrostatic image holder

Claims (3)

[Claims] (1) A non-magnetic one-component toner comprising at least a heat-softened resin and a colorant, wherein the colorant is a mixture of at least two pigments of the same color or different colors. (2) The non-magnetic film according to claim 1, characterized in that the charge polarity of the colorant is opposite to the charge property of at least one type of pigment constituting the colorant. ingredient toner. (3) In a toner formed by adding positively charged colloidal silica to toner particles containing at least a resin that softens with heat and a colorant, the amount of triboelectric charge of the toner formed by adding the positively charged colloidal silica is: A non-magnetic one-component toner, characterized in that the amount of triboelectric charge is smaller than that of the toner particles.