JPH01116650A - Method and device for developing electrostatic charge image - Google Patents

Abstract

PURPOSE:To obtain a good image even under high humidity and low humidity over a long period of time by adding a specific ratio of phthalocyanine deriv. to a nonmagnetic toner. CONSTITUTION:The phthalocyanine deriv. expressed by the formula I is incorporated at 0.1-3wt.% into the toner for developing electrostatic charge images in a method for developing the electrostatic charge image by carrying the toner without using a magnetic effect and splashing the same between a toner layer and the electrostatic charge image. In the formula I, Pc denotes a residual group of metal or nonmetal phthalocyanine; A denotes a bivalent bond group; R2, R1 denote an alkyl group, aryl group, etc., which may have a substituent; n denotes 0-10; m denotes 1-4 integer. The good image is thus stably obtd. even under the high humidity and low humidity over a long period of time by using a nonmagnetic one-component contactless development system.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Field of the Invention The present invention relates to an improved method and apparatus for developing electrostatic images using non-magnetic component toners.

(Prior art) In recent years, electrophotography, electrostatic recording, electrostatic printing, etc. (hereinafter referred to as
Electrophotography (abbreviated as electrophotography) has made remarkable progress;
phy (R, M, S*ffert, Poca
! After uniformly charging the surface of the photoreceptor, the image corresponding to the document is exposed to light to eliminate or reduce the charge in the exposed area and prevent the formation of an electrostatic latent image. Let's do it. Next, by electrostatically depositing an electrostatic charge developing toner (hereinafter abbreviated as toner) on this electrostatic latent image, development is performed and the electrostatic latent image is visualized.

In this case, the amount of toner attached changes depending on the amount of charge on the surface of the photoreceptor, and as a result, a toner image with shading is formed. This toner image is transferred to a support such as paper, cloth, or polymeric film depending on the purpose, and is generally heated directly or indirectly to fix it on the surface of the support.

Many methods are known as developing methods in electrophotography, but they can be roughly divided into two-component methods that use a mixture of a toner and a carrier made of fine particles (50 to 300 μm) of iron powder, ferrite, glass, etc. as a developer. There are two types: a developing method and a one-component developing method that uses a developer consisting only of toner.

In either method, charge is generally injected into the toner in a triboelectric manner.

As a representative example of the two-component development method, US Patent No. 2゜618.
The cascade method described in '552 and the magnetic brush method described in US Pat. No. 2,874,063. With these methods, relatively stable and good images can be obtained, but on the other hand, image quality may deteriorate due to contamination of the carrier surface with toner, etc., and changes in triboelectric charging properties due to variations in the mixing ratio of carrier and toner. It inherently has the problems of two-component development, such as deterioration.

- Component development method avoids the problems of such two-component development method, for example, as disclosed in U.S. Pat. No. 4,336
．． No. 318 describes a method of developing using electrically insulating magnetic toner, and British Patent Nos. 1 and 5
No. 03,560 describes a developing method using toner in which a magnetic material is exposed on the surface. In these methods, the toner is composed of toner particles, a toner carrier and/or
Alternatively, charges are injected by frictional charging between the toner particles and the toner thinning member, or by frictional charging between toner particles, and the toner particles are electrostatically attached to the electrostatic latent image on the photoreceptor.

This -component development method has the great advantage of making the developing device smaller because it does not use a carrier and does not require a device to control the mixing ratio of carrier and toner. Since the insulating toner has poor fluidity, it is not sufficiently triboelectrically charged, which makes it difficult to perform uniform development and causes problems such as background smearing.

In order to avoid such problems with the -component development method, there is a method of improving the fluidity of the toner by supporting hydrophobic silica on the toner surface (Japanese Patent Laid-Open No. 132757/1983).
, the so-called jumping development method (Japanese Patent Publication No. 8831/1983) has been proposed, in which the toner is caused to fly and develop without coming into contact with the photoreceptor. However, these methods use magnetic action to transport the toner, so the toner necessarily contains a large amount (usually 30-70%) of magnetic material. As a result, the essential problems with magnetic toners are that good images cannot be obtained under high humidity due to the hygroscopic nature of the magnetic material, and that clear and transparent color toner cannot be obtained due to the dark colors of the magnetic material. It still remained.

In order to solve the essential problems of the one-component development method using magnetic toner, a one-component development method that does not use magnetic materials has been proposed. For example, the non-magnetic component non-contact described in Japanese Patent Publication No. 60-45270, No. 59-228271, No. 62-19884, No. 62-89975 and the Journal of Electrophotography, Vol. 26, No. 2, pages 107-114. This is a developing method.

It has been found that according to these methods, since the toner does not contain a magnetic material, a clear and transparent color toner can be obtained, and high image quality can be obtained relatively stably even under high humidity.

However, according to these developing methods, it has been found that triboelectric charging of the toner becomes unstable due to toner contamination on the toner carrier and/or the toner thinning member, making it difficult to obtain good images. It has also been found that this tendency becomes more pronounced under high humidity and low humidity conditions.

(Problems to be Solved by the Invention) The purpose of the present invention is to provide good images even under high humidity and low humidity.
It is an object of the present invention to provide an electrostatic charge image developing method using a non-magnetic component non-contact developing method that can be obtained over a long period of time.

Another object of the present invention is to provide an electrostatic image developing device for use in such an electrostatic image developing method.

[Structure of the Invention] The present inventors have developed a non-magnetic component non-contact developing method,
As a result of extensive research into the effects of toner materials on image quality, we discovered that the problems of the non-magnetic component non-contact development method described above could be solved by adding a phthalocyanine derivative to non-magnetic toner. He came up with an invention.

That is, the present invention conveys and supplies powder toner for electrostatic image development to a toner carrying roller without using magnetic action,
forming a thin layer of the toner on the toner carrying roller by a toner thinning member, and causing the toner to fly from the thin layer of toner onto an electrostatic latent image opposing the toner carrying roller with a certain gap therebetween; Provided is a method for developing an electrostatic latent image, wherein the toner contains 0.1 to 3% by weight of a phthalocyanine derivative represented by Noshiro below. It is.

- Noshiro % Formula %] [In the formula, Pc is a metal or metal-free phthalocyanine residue, A is a divalent bonding group, R2 and R1 are an alkyl group, an aryl group, an araaryl group that may have a substituent, n
represents an integer of 0 to 10, and m represents an integer of 1 to 4. In the above - Noshiro, A is preferably -COO-1
-CH2NR3-1-8O2NR3-1-CONH2-
(R3 represents a hydrogen atom or a saturated or unsaturated alkyl group having 1 to 20 carbon atoms).

The above-mentioned phthalocyanine derivative represented by Noshiro can be easily synthesized by the method described in JP-A-52-132031, JP-A-58-1'45762, JP-A-58-167654, and the like.

Specific examples of the phthalocyanine derivatives represented by Noshiro above include the following.

It has been found that when a multi-strand ring or a derivative thereof is used, the amount of charge of the toner varies greatly and cannot be used in the present invention.

The amount of the phthalocyanine derivative contained in the toner used in the method of the present invention is 0.1 to 3% by weight, preferably 0.3 to 1.5% by weight, based on the toner. If the amount is less than 0.1% by weight, the effect of the present invention will not be exhibited, while if it exceeds 3% by weight, the amount of charge of the toner may fluctuate, and if the phthalocyanine group has a hydrophilic group, the moisture resistance may deteriorate. It deteriorates and is also economically disadvantageous.

Although only one type of phthalocyanine derivative may be used alone, two or more types may be used in combination.

The binder contained in the toner used in the method of the present invention is not particularly limited, but the following resins are preferably used.

Polystyrene system; Copolymer system of styrene and acrylic ester, acrylonitrile, maleic acid or maleic ester, etc.; Polyacrylic ester system; Polymethacrylic ester system; Polyester system; Polyamide system;
Polyurethane type; polyvinyl acetate type; polyvinyl chloride type; polyvinyl butyral type; epoxy type; phenol type; aliphatic or alicyclic hydrocarbon type; rosin type; terpene type; petroleum type; paraffin type. These can be used alone or in combination. Among these, polystyrene-based, styrene/acrylic ester-based, styrene/methacrylic ester-based and polyester-based resins are particularly preferred in terms of developability and durability.

In the toner according to the present invention, various additives such as a colorant, a charge control agent, and an anti-offset agent can be added to the inside or outside of the particles, if necessary.

Coloring agents include zinc yellow, yellow iron oxide, fast yellow, disazo yellow, red radish, and watch palm red Ca.
Depending on the purpose, pigments can be appropriately selected from various pigments such as salt, phthalocyanine blue, metal-free phthalocyanine, quinacridone red, titanium white, and carbon black in terms of hue and resistance. The amount of colorant used is about 0 to 20% based on the toner.

Examples of charge control agents include azine-based nigrosine derivatives, quaternary ammonium salt compounds, specifically nigrosine base EX, Bontron N-01, N-07, P-
51 (trade name, manufactured by Orient Chemical Co., Ltd.), TP-302
(trade name, manufactured by Hodogaya Chemical Co., Ltd.); and electron-accepting organic complexes such as metal-containing azo dyes or non-pigment metal complexes, chlorinated paraffins, chlorinated polyesters, and copper phthalocyanine derivatives. , specifically Bontron E
-82, E-84, 5-34 (product name, manufactured by Orient Chemical Co., Ltd.), Kaya Set Black T-2, Kaya Charge N-
1 (product name, manufactured by Nippon Kayaku Co., Ltd.), Spiron Black TRH
(trade name, manufactured by Odugaya Kagaku Co., Ltd.) and the like can be used. The amount of these charge control agents used is usually 0.1 to 5% by weight based on the toner.

As the offset inhibitor, for example, a polyolefin type having a softening point of 70 to 170°C by the ring and ball method.

An amide wax, an ester wax, or the like can be used. Examples thereof include polyethylene, polypropylene, dibasic acid bisamide, carnauba wax, and the like. These can be used alone or in combination. The amount of the anti-offset agent added is preferably 1 to 7% by weight.

Furthermore, the toner according to the present invention may optionally contain a fluidity improver such as hydrophobic silica; a higher fatty acid metal salt represented by zinc stearate; and a cleaning agent such as a fine powder of a fluorine-based polymer. Properties improvers - photoreceptor surface polishing agents such as cerium oxide and strontium titanate; developability/transferability regulators such as fine powders of alumina, tin oxide, molybdenum disulfide, copper oxide, polymethyl methacrylate, etc. It is also possible to add functional agents to the particle surface. The amount of these functional agents added is preferably 0.1 to 3% by weight based on the toner.

When developing a negatively electrostatically charged image using the toner of the present invention, positively charged silica is particularly preferably used as the hydrophobic silica. When negatively charged silica is used, fog increases during continuous copying when a small amount is used, and image density is initially low when a large amount is used. The hydrophobic silica preferably used is fine silica powder surface-treated with a silane compound represented by the following general formula.

General formula % formula % (wherein, X is an alkoxy group or a chlorine atom, Y is an organic group having a primary to tertiary amino group, m and n are integers of 1 to 3, and the total is 4. ) The positively charged hydrophobic silica treated with the silane compound of the above general formula can be easily synthesized by those skilled in the art with reference to Japanese Patent Publication No. 53-22447. In addition, the following can be mentioned as a specific example of the compound shown by the said general formula.

H3 ■ H2NCH2CH2NllCH2CH2CH2Si (
OCH3) 2HJCONHC112CH2CH2SI
(OC2H5) 3HJCthCH2CH2Si (
OCH2CH3) 3H2NCH2CH2NHCH2C
Il□CH2Si (OCH3) 31(2NCH2C
112CH2S1 (OCH3) 3112NCH2C
H2NIICI(2C!l2NHC112CH2CH2
81 (OCH3) 3115020COCH2C112
NIC112CI2CII281 (OCH3) 3H
5C20COCH2CH2NIICH2CH2NHCI
I2CI12C1 (2S i (OCH3) 385C
20COCR2CI2NIICH2C1 (2NIICH
2CH2NHClI2CI2NIICH2CH2CII
2S i (OCH3) 3NH2C6114Si (
OClli) 3CJ9NICH2C1hCH2Si
(OCH3) 3 Furthermore, the present invention provides a toner carrying roller, a supply roller that conveys and supplies powder toner for developing an electrostatic image without using magnetic action to the toner carrying roller,
A toner thinning member for forming a thin layer of toner on the toner carrying roller, which faces the toner carrying roller with a certain gap therebetween, and is developed by the toner flying from the thin layer of toner. An electrostatic image developing device comprising an image holding member that holds an electrostatic latent image, wherein the toner contains 0.1 to 3% by weight of a phthalocyanine derivative represented by the above general formula. The present invention provides an electrostatic image developing device characterized by the following.

According to the electrostatic image developing device of the present invention, the toner is first conveyed and supplied to the toner carrying roller by the supply roller without using magnetic action. The supply roller is usually 2~
Made of neoprene rubber foam with a hardness of 15 degrees. If the hardness is less than 2 degrees, the supply roller will be deformed, and if it exceeds 15 degrees, the torque will become too large and the durability of the image will deteriorate. The toner carrying roller and the supply roller rotate in the same direction, and their circumferential speed ratio is 1:0.2 to 2.0, usually 1:
It is 0.5. The peripheral speed of the supply roller is slower than this.1. ), the image density will be low, and if it is fast, the torque will be too large to suit the developing system.

The toner supplied to the toner carrying roller is thinned onto the toner carrying roller to a certain thickness by a toner thinning member (coating blade).

The coating blade is usually made of a stainless steel plate, and is pressed against the toner carrying roller at a portion 0.1 to 2 mm from its tip. The pressure is usually 40~
120 g/cm. The toner becomes electrically charged due to friction between the toner and the coating blade during formation of a thin toner layer. The thickness of the toner thin layer formed on the toner carrying roller by the coating blade is 5 to 80 μm.
m1 is preferably 10 to 40 μm. If the thickness of the thin toner layer is less than 5 .mu.m, the image density will be low, and if it exceeds 80 .mu.m, the amount of toner consumed will increase, making it uneconomical and causing toner scattering and fogging.

The toner carrying roller is usually made of a low-resistance metal, such as A, 17, SUS, or a conductive rubber roller, and its surface is sandblasted with an abrasive of 200 to 1000 #. If the particle size of the abrasive is coarser than 200#, the thickness of the thin toner layer becomes too thick,
If it exceeds #, it will become too thin and the above-mentioned problem will occur. Note that the surface of the toner carrying roller is electroless nickel plated.

An image holding member (photoreceptor) that holds an electrostatic latent image is provided opposite the toner carrying roller with a certain gap therebetween. The toner carrying roller and coating blade have −
DC voltage of 100 to -300V, usually -200V,
An alternating current voltage of 2 to 4 KV and 211 to 3 KV is applied in a superimposed manner, and the surface potential of the photoreceptor is 500 to 100 OV. The negatively charged toner on the toner carrying roller flies through the gap between the toner carrying roller and the photoreceptor, adheres to the electrostatic latent image, and develops the electrostatic latent image. When the DC voltage applied to the toner carrying roller is lower than 1300V, when the AC voltage is lower than IKV, the frequency is 2K.
If the frequency is lower than Hz, the toner will not fly, resulting in poor quality images.

On the other hand, the DC voltage applied to the toner carrying roller is 110
If higher than 0V, AC voltage, if the voltage is higher than 3KV,
When the frequency is higher than 4 KHz, leak images are likely to occur.

The gap between the toner carrying roller and the photoreceptor is 200 to 4
00μm, more preferably 250~
It is 330 μm. If it is less than 200 μm, leakage images tend to occur, and if it exceeds 330 μm, it becomes difficult for toner to fly and image defects tend to occur.

The photoreceptor and the toner carrying roller rotate in opposite directions, and their circumferential speed ratio is 1:0.5 to 3.0, usually 1:1.2. If the circumferential speed of the toner carrying roller is slower than this, the image density will be low, and if it is faster than this, the amount of toner consumption will increase, making it uneconomical and causing toner scattering and fogging.

(Function) Although the mechanism of action of the phthalocyanine derivative in the toner used in the method of the present invention has not yet been completely clarified, it is presumed to be as follows.

That is, in the non-magnetic component non-contact development method as in the present invention, not all of the toner on the toner carrying roller is transferred to the photoreceptor during development, so the toner remaining on the toner carrying roller has a long Frictional charging with the coating blade will increase over time. As a result, if each toner is non-uniform and the toner charge amount distribution is wide, the toner charge amount distribution becomes wider and wider as time passes, resulting in deterioration of image quality.

On the other hand, when a phthalocyanine derivative is present during toner kneading as in the toner used in the present invention, the phthalocyanine derivative according to the present invention has a phthalocyanine group and a tertiary group at the molecular end, as is clear from Noshiro. It has an amino group, and this phthalocyanine group adsorbs to the polar group of the pigment in the toner, and the remaining tertiary amino group is thought to prevent re-aggregation of the pigment due to its steric hindrance effect. In fact, according to experiments conducted by the present inventors, when R1 and/or R2 in the above general formula is a hydrogen atom, the effect of the present invention is hardly manifested, so such an inference seems to be correct. It will be done. Since re-agglomeration of the pigment is prevented and the pigment is uniformly dispersed, each particle of the toner according to the present invention is homogeneous, and as a result, the triboelectric charging property of the toner is maintained over a long period of time. It is considered that it is stable over continuous use and exhibits the effects of the present invention.

(Example) Hereinafter, an electrostatic image developing device according to the present invention will be specifically described with reference to the drawings.

FIG. 1 is a schematic diagram showing an electronic copying machine according to an embodiment of the present invention. A photoreceptor 2 serving as an image holding member is provided approximately at the center of the copying machine main body 1 so as to be rotatable in the direction of the arrow. A charger 3, an imaging lens array 4, a developing device 5, a transfer charger 6, a cleaner 7, and a static eliminator 8 are sequentially arranged around the photoreceptor 2 along the direction of rotation thereof. ing. Further, an optical system 9 for exposing a document to light is provided at the top of the main body 1, and a paper feed cassette 10 is installed at the bottom of the main body 1. Paper is supplied from this paper feed cassette 10, and the paper is conveyed along a conveyance path 11. A registration roller 12, a fixing device 13, and a paper ejection roller 14 are arranged along the paper transport direction in the transport path 11. Note that 15 is a paper discharge tray, and 16 is a document table.

The copying process in the above-mentioned copying apparatus is as follows. First, the optical system 9 illuminates the document on the document table 16 with light, and the reflected light is imaged on the photoconductor 2 via the imaging lens array 4, forming an electrostatic latent image on the photoconductor 2. It is formed. Toner supplied from the developing device 5 adheres to this electrostatic latent image, and the electrostatic latent image is visualized. On the other hand, the paper supplied from the paper feed cassette 10 is sent between the photoreceptor 2 and the transfer charger 6, and the developed image on the photoreceptor 2 is transferred to the paper. Thereafter, the paper is conveyed along the conveyance path 11 to the fixing device 13 , where it is fixed, and then discharged onto the paper discharge tray 15 via the paper discharge roller 14 .

Next, the developing device 5 in the above-described copying apparatus will be described in detail. The developing device 5, as shown in FIG. , a toner supply roller 24 and a toner carrying roller 25 are provided. The toner carrying roller 25 faces the photoconductor 2 through a gap of 200 to 400 μm, and is capable of rotating at a peripheral speed of 1 to 3 times that of the photoconductor 2 by a driving means (not shown). Further, inside the developing unit 21, the upper end thereof is connected to the holder 2.
A coating blade 27 as a toner thinning member is provided, which is held in a conductive state by 6 and whose lower end abuts against the toner carrying roller 25 . Furthermore, a collection blade 28 is brought into contact with the lower side of the toner carrying roller 25 .

During development, the toner is supplied to the carrier roller 25 by the rotation of the supply roller 24, and the toner is supplied to the carrier roller 25 by the rotation of the supply roller 24.
7, and is triboelectrically charged. The toner charged on the toner carrying roller 25 flies through the gap between the toner carrying roller 25 and the photoreceptor 2, and
It attaches to the electrostatic latent image and develops the electrostatic latent image. The toner remaining on the toner carrying roller 25 is collected into the developing unit by a collection blade 28.

An example of manufacturing the toner used in the present invention will be shown below.

Production example 1゜ A mixture having the following composition was obtained.

Styrene/butyl methacrylate/methacrylic acid N,N-
Dimethyl ethyl ester copolymer (weight ratio -55/34
/1. My = 131,000; Mn -11,00
0) -----=90 parts Compound 3
...0.5 parts carbon black (manufactured by Mogul Shikaku Cabot) ...4 parts nigrosine dye Bontron NOI ...3 parts polypropylene Viscole 660P (manufactured by Mie Kasei Co., Ltd.) ... ...3.5 parts After predispersing the above mixture, a twin screw kneader PCM-30 (
(manufactured by Ikegai Tekko Co., Ltd.).

Next, the mixed wire material was rolled and cooled, and then coarsely pulverized with a hammer mill and finely pulverized with Labojet (manufactured by Nippon Ninimatic Co., Ltd.). This was classified using a zigzag classifier (manufactured by Albine) to obtain a toner having an average particle size of 10.4 μm.

Production Example 2゜Quaternary ring charge control agent TP- instead of nigrosine dye
302 (manufactured by Hodogaya Chemical Co., Ltd.) and a toner having an average particle size of 9.6 μm was obtained in the same manner as in Production Example 1, except that Compound 4 was used instead of Compound 3.

Manufacturing example 3゜ A mixture having the following composition was obtained.

Styrene/butyl methacrylate copolymer (weight ratio -65
/35. My-150,000; Mn-7,900)
--87 parts carbon black, rubber 125° (manufactured by Columbia Carbon)...
・4-part compound 4 ・・・・・
・1 part nigrosine dye Bontron NO7...
2 parts Quaternary ring charge control agent P-51 2 parts Polypropylene Viscole 550P (manufactured by Mie Kasei Co., Ltd.) 2 parts Polyethylene Hiwax 1140H (manufactured by Mitsui Petrochemicals Co., Ltd.) 2 parts The above-mentioned base was converted into a toner in the same manner as in Production Example 1 to obtain a toner having an average particle size of 10.2 μm.

Production example 4゜ A mixture having the following composition was obtained.

Styrene/butyl acrylate/N,N-diethyl ethyl methacrylate copolymer (weight ratio = 79/20/1.My
-110,000, Mn -10,000)
・・・・・・89 parts carbon black Mogul Shiku Cabot fM) ・・・・・・4
Part Compound 7: 0.5 parts Quaternary salt charge control agent TP-302: 3 parts Polypropylene Viscole 550P: 2 parts Carnauba wax (manufactured by Noda Wax Co., Ltd.) )・・・・・・
2 parts The above mixture was converted into a toner in the same manner as in Production Example 1 to obtain a toner having an average particle size of 10.4 μm.

Production Example 5 A toner having an average particle size of 10.7 μm was obtained in the same manner as Production Example 1, except that Suhiron Black TRH was used in place of the nigrosine dye Bontron N-01.

Comparative Production Example 1 A toner having an average particle size of 10.3 μm was obtained in the same manner as Production Example 1, except that Compound 3 in which the ethyl group bonded to N was replaced with hydrogen was used.

Comparative Production Example 2 In the same manner as Production Example 3, except that Compound 4 was excluded and 87 parts of the resin was changed to 88 parts, a 215", 6F frost ← F='f@Ga Comparative Production Example 3 The average particle size was 10.4μ in the same manner as Production Example 4, except that Compound 7 was excluded and 88.5 parts of resin was changed to 89 parts.
m toner was obtained.

The following is a test example for evaluating the performance of the toner obtained in the above production example.

Test Example Each toner was used in a copying machine BD-3110' (manufactured by Toshiba Corporation) whose developing device was modified as shown in FIG. 2, and a running test was conducted in which 10,000 copies were made. The results are shown in the table below. In the case of a positively chargeable toner, a toner to which 0.3% by weight of positively chargeable silica RA-200H (manufactured by Nippon Aerosil Co., Ltd.) is externally added is used, and a negatively chargeable organic photoreceptor is used as a photoreceptor. Using. In addition, in the case of negatively chargeable toner, negatively chargeable Si Se T is used as the toner.
e photoreceptor was used.

From the table below, it can be seen that according to the method of the present invention, good images can be stably obtained over a long period of time even under high humidity and low humidity, which is superior to the conventional method using conventional toner.

In the table, "environment" refers to the temperature and relative humidity at the location of the running test, "run" refers to after copying 10,000 sheets, and "fog" refers to the temperature and relative humidity of the place where the running test was performed. shows the difference in reflectance.

[Effects of the Invention] As explained above, according to the present invention, it is possible to stably obtain good images over a long period of time even under high humidity and low humidity using a non-magnetic component non-contact development method. be.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing a copying machine according to an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of a developing device in the copying machine of FIG. 1. DESCRIPTION OF SYMBOLS 1... Copying machine main body, 2... Photoreceptor, 5... Developing device, 24... Toner supply roller, 25... Toner carrying roller, 27... Coating blade. Applicant's agent Patent attorney Takehiko Suzue 2 drawings

Claims (1)

[Scope of Claims] (1) A step of transporting toner for developing an electrostatic image, a step of thinning the toner transported by this toner transporting step, and a toner formed by this toner thinning step. A step of making the toner layer and the electrostatic latent image face each other with a constant gap larger than the layer thickness of the layers, and causing the toner to fly between the toner layer and the electrostatic latent image facing each other through this facing step. and developing an electrostatic latent image, the toner containing 0.1 to 3% by weight of a phthalocyanine derivative represented by the following general formula. General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ [In the formula, Pc is a metal or metal-free phthalocyanine residue, A is a divalent bonding group, R_2 and R_1 are an alkyl group that may have a substituent, Aryl group, araaryl group, n represents an integer of 0 to 10, and m represents an integer of 1 to 4. (2) The electrostatic image developing method according to claim 1, wherein 0.05 to 1 part by weight of positively chargeable silica fine powder is mixed with 100 parts by weight of the toner. (3) The electrostatic image developing method according to claim 1, wherein the thickness of the thin layer of toner is 5 to 80 μm. (4) a housing containing a toner containing 0.1 to 3% by weight of a phthalocyanine derivative represented by the following general formula; a toner carrying member that is partially exposed from the housing and conveys the toner; a toner thinning member that is provided in contact with the toner carrying member and thins the toner; and a toner carrying member that is separated by a certain gap that is larger than the thickness of the toner layer formed by the toner carrying member. an electrostatic latent image holding member disposed opposite to each other to hold an electrostatic latent image; and means for causing toner to fly within a certain gap between the toner carrying member and the electrostatic latent image holding member. An electrostatic image developing device. General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ [In the formula, Pc is a metal or metal-free phthalocyanine residue, A is a divalent bonding group, R_2 and R_1 are an alkyl group that may have a substituent, Aryl group, araaryl group, n represents an integer of 0 to 10, and m represents an integer of 1 to 4. (5) The electrostatic image developing device according to claim 4, wherein a gap between the toner carrying member and the electrostatic latent image holding member is 200 to 400 μm.