JPS59123854A - Particle to be added to developer and its manufacture - Google Patents

Abstract

PURPOSE:To obtain particles to be added to manufacture a one-component type magnetic developer with stability, superior fluidity, coagulation resistance and triboelectric chargeability. CONSTITUTION:Particles are added to a one-component type magnetic developer so as to improve the developing characteristics such as fluidity. Fine particles of <=1mum particle size such as colloidal silicon dioxide are mixed with a dye such as a heat-sublimable disperse dye, the mixture is heated to stick the dye to the surface of the fine particles, and the particles are made hydrophobic with an organosilicon compound such as trimethylchlorosilane, dimethylchlorosilane, hexyldimethylchlorosilane or dimethylpolysiloxane to manufacture said particles to be added.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an additive powder for a developer used for visualizing electrostatic latent images in electrophotography or electrostatic recording [Technical background of the invention and its problems] ] As an electrophotographic developing method, for example, U.S. Patent No. 2,87
No. 4,063, No. 2,618,552, No. 2,221
, No. 776 and No. 2902974, respectively, the magnetic brush method, cascade method, powder cloud method,
Methods based on the fur brush method and the like are known.

Among these methods, a magnetic brush method and a cascade method using a two-component developer mainly consisting of toner and carrier are commonly used. With developing devices using these methods, images that are relatively stable and of excellent quality can be easily obtained.

However, on the other hand, there are drawbacks common to two-component developers as shown below. In other words, ■toner is
Frictional charges are received due to the mutual friction between the toner and the toner, but in that case, if the toner is used for a long time,
The carrier surface becomes contaminated with the toner composition and as a result cannot acquire sufficient charge. (2) The mixture ratio of toner and carrier must be adjusted within a predetermined range, but if used for a long period of time, the mixture ratio will fluctuate and deviate from the predetermined range. (2) Generally, iron powder or glass beads with oxidized surfaces are often used as carriers, but in this case, the surface of the photoreceptor is mechanically damaged by these carriers.

For this reason, various developing methods using a one-component developer consisting only of toner have been proposed. Above all,
A number of development methods have been proposed that use a developer that is magnetically sensitive and is generally called a magnetic toner. Among these, U.S. Pat.
Products based on No. 1 etc. have 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 supporting member such as plain paper, and in a humid atmosphere. (1) Since the toner contains a large amount of magnetic powder, color toner cannot be obtained.

However, recently, a developing method using a one-component toner that does not contain magnetic powder and has a high specific resistance has been attracting particular attention.

Such developing methods include, for example, U.S. Pat.
No. 5,847, No. 3,152,012, Special Publication No. 1973
-9475, 45-2877, 54-3624
Examples include methods based on the touchdown method, impression method, and jumping method described in the No. These methods utilize conventional toners used in two-component systems.

However, in this case, various problems associated with the -component system are unavoidable, as described below. The first point is the problem of fluidity and cohesiveness. That is, in the developing method disclosed in JP-A-52-143831, the toner must be applied extremely thinly and uniformly onto the developer carrier, but in this case, the applied toner has no fluidity. Although good properties and non-agglomeration properties are required, to date no toner has been developed that fully satisfies these properties.

The second point is the problem of triboelectric charging. That is, JP-A-55
When applying the jumping method disclosed in Japanese Patent Application No. 18657, etc., the toner must be efficiently tribo-electrified with the developer carrier, but this is not always possible with conventional toners.

On the other hand, as a means to improve the fluidity of toner and prevent agglomeration, Japanese Patent Publication Nos. 54-16219 and 54-1
The method described in No. 9343 and the like has been proposed. Although these methods can improve the fluidity and cohesiveness of toner to some extent, they are still not sufficient and cause the following problems. That is, when fine hydrophobic silica particles are externally added to toner as described in Japanese Patent Publication No. 54-16219, the silica separates from the toner and accumulates on the developer carrier, causing problems such as ghost images and the like. Adversely affect. Furthermore, as described in Japanese Patent Publication No. 54-19343, when a lubricant such as fluorinated carbon is used in the toner, a large amount of the lubricant must be included in order to obtain the desired effect. Problems arise with color reproduction.

Furthermore, with the above-mentioned means, it is not possible to obtain efficient triboelectrification using conventional triboelectrification control, that is, a method using a resin having a polar group or a method using a charge control agent such as a dye. That is, silica and lubricant appear on the surface of the toner, which affects the charging effect, and in some cases, the polarity may be reversed.

[Purpose of the invention]

The purpose of the present invention is to provide additive particles for a one-component developer that is stable, has excellent fluidity and agglomeration resistance, and is useful for a one-component non-magnetic development method that enables efficient triboelectric charging, and a method for producing the same. do.

[Summary of the invention]

The first invention of the present application will be explained below.

The first invention of the present application is additive particles for a developer, in which a dye is attached to the surface of fine particles having a particle size of 1 μm or less. By mixing or adhering such additive particles to the toner (developing main agent), the surface of the toner is modified, and a developer having excellent fluidity and agglomeration resistance and capable of efficient triboelectric charging is obtained. This is because, by adding additive particles, the contact area between toner particles becomes smaller, the porosity increases, and since the additive particles completely cover the toner surface, the charging polarity becomes uniform with the same sign. This is thought to be due to various effects such as charging by the additive particles.

Therefore, the developer additive particles of the present invention are particularly suitable for one-component development using a non-magnetic development method.

The blending ratio of the additive particles to the toner is 001 to 3.
It is desirable that the content be in the range of 0% to 1i%.

As the fine particles having a particle diameter of 1 μm or less used in the present invention, all kinds of particles can be used, regardless of whether they are inorganic or organic. For example, metals such as iron, copper, aluminum, silver, nickel, chrome zinc, silicon, metal oxides such as mini iron oxide, triiron tetroxide, titanium oxide, silicon dioxide, zinc oxide, lead oxide, aluminum oxide, and disulfide. Examples include metal sulfides such as molybdenum, tungsten disulfide, titanium sulfide, other metal carbides, metal nitrides, and powders such as carbon black, talc, vinyl chloride acrylic resin, and styrene resin. Among the fine particles, colloidal silicon dioxide having a size of 5 to 30 mm is particularly preferable because it has a high resistivity and exhibits stable charging properties. The reason for limiting the particle size of these fine particles is that if the particle size exceeds 1 μm, it will not adhere to the toner, which is the main developing agent, and will be detached and scattered during development, resulting in inconveniences such as image disturbance. It is. In order to fully achieve the purpose of the present invention, it is desirable that the particle size of the fine particles be 100 ynμm or less.

The dye used in the present invention has the effect of controlling the polarity of the toner when additive particles are attached to the toner surface.

Examples of such dyes include direct dyes, acid dyes, basic dyes, mordant dyes, sulfur dyes, vat dyes, azoic dyes, oil-based dyes, heat-sublimable disperse dyes, etc., all of which are specifically listed below. be able to.

(1) Direct dyes; Direct Sky Blue, Direct Black W, etc.

(2) Acid! Dyes: tartrazine, acid violet 6B, acid 7 astrez 3G, etc.

(3) Basic dyes: Su7lanin, auramine, Lyristal Violet, methylene blue, Rhodamine B1, Victoria Blue B, etc. ◇ (4) Mordant dyes: Xancromine Fast Blue MB,
Erio from Azurol B1 Alizarin Yellow R etc.

(5) Sulfur dye; Sulfur Brilliant Green 4G, etc.

(6) Vat dye; indanstremble, etc.

(7) Azoic dye; naphthol As, etc.

(8) Oil dye; Nicrosin, Spirit Black EB
1 Varifast Orange + 3206, Oil Black #
215 etc.

(9) Heat-sublimable disperse dye (9-i) Monoazo disperse dye; This Goods First Yellow 01 Geisl? -Sfast Yellow 5
G, Days Birds First Yellow 5R, Days Birds Red R, etc.

(9-ii) Anthraquinone

(9-iii) Nitrodiphenylamine disperse dye;
Disf 4's Fastest Yellow RR, 7'Isbird's Fastest Yellow GL, etc.

Regarding the above-mentioned ratio of dye adhesion to the surface of the fine particles, if the amount of adhesion is too large, the fine particles will aggregate and the dye will be liberated from the fine particles, whereas if it is too small, charging control will not be sufficient. Therefore, o for fine particles
, ooi to 0.5 parts by weight.

Next, the invention of the cylinder 2 of the present application will be explained in detail.

First, one of the dyes other than the heat-sublimable disperse dyes mentioned above.
A species or 28 or more species are selected and dissolved in a suitable solvent such as water, alcohol, acetone, butyl acetate, toluene, ether, etc. At this time, heating may be performed if necessary. Next, the above-mentioned fine particles are added to this dye solution, thoroughly mixed and stirred, and then the solvent is dried at room temperature or by heating with a spray dryer, etc. to attach the dye to the surface of the fine particles. Build.

In addition, when using a heat-sublimable disperse dye as the dye, fine particles are mixed with the heat-sublimable disperse dye, and the disperse dye is sublimated under heating and reduced pressure to adhere the thermal dye to the surface of the fine particles, followed by development. Make additive particles for agents. By employing such a method, various effects shown below can be achieved.

(2) Since no solvent is used unlike the above-mentioned direct dyes, additive particles can be obtained economically and safely.

■ Even if ultrafine particles of silicon dioxide, aldinium oxide, titanium oxide, etc. of 200 mμm or less produced by the gas phase method are used,
Fine developer additive particles can be easily obtained without agglomeration of ultrafine particles.

■The resulting additive particles have a uniform thickness of heat-sublimable disperse dye adhered to the surface of the fine particles, so by mixing this with the toner, which is the main developing agent, and adhering it, fluidity and aggregation resistance are greatly improved. It is possible to obtain a developer that has excellent properties and is capable of efficient triboelectric charging.

In addition, the developer additive particles obtained by the above method were subjected to high humidity (
601RH or higher), the additive particles may be made hydrophobic by the following method.

That is, the fine particles treated with the dye are placed in a container, placed under a pressure of 10 to 10 mm and 11 g under reduced pressure, a heated organosilicon compound is introduced therein, and the fine particles in the container are stirred so that the organosilicon compound is sufficiently circulated. After leaving it for a while, air is introduced to release the reduced pressure, then the pressure is reduced again, an organic silicon compound is introduced, and the same operation is repeated to effect hydrophobization.

The above-mentioned organosilicon compound is, for example, represented by the general formula % [wherein R may be the same or different and represents a hydrogen atom, an alkyl group or alkenyl group having 1 to 8 carbon atoms, or a phenyl group] where n is an integer from 0 to 3. Further, Y may be the same or different, and the halogen group, alkoxy group, acetoxy group, or R'lv' may also be different, and have the same meaning as the above R, and t is 1
It is an integer between ~100. ), where m is 1
is an integer of ~3, provided that m-)-n does not exceed 4].

Further, as another organosilicon compound, general formula R35i-
■-8iR3 [However, R in the formula represents an alkyl group having 1 to 4 carbon atoms,
They may be the same or different. ].

Specific examples of the organosilicon compounds represented by the above general formula include trimethylchlorosilane, dimethylchlorosilane, methyltrichlorosilane, tetrachlorosilane,
Allyldimethylchlorosilane, diphenyldichlorosilane, hexyldimethylchlorosilane, dimethylchlorosilane, dimethyldiacetoxysilane, methyltriacetoxysilane, methylvinyljethoxysilane, diphenyljethoxysilane, dimethylpolysiloxane, ((C
H3)5Si:)2NH and ((C)1.)2(C2Hs
) St) 2NH, etc., represented by the general formula % formula % (wherein R represents an alkyl group), [(CH3)5siNH)2sl(CHs)2. [(C
H3)3sl)2NHs, etc. can be used.

Hydrophobization of developer additive particles by the organic silicon compound described above is achieved by the following mechanism.

First, when the fine particles or dye have hydroxyl groups, they are directly reacted with the organic silicon compound to be hydrophobized. Further, even when there is no hydroxyl group, the adsorbed water reacts with the silicon compound to form a hydrophobic coating layer on the surface of the fine particles.

Therefore, the toner using the hydrophobized developer composition of the present invention is not affected by humidity at all. [Examples of the Invention] The present invention will be described below based on Examples.

Example 1 After putting 1 part by weight of titanium oxide with a particle size of 0.3 in a container, 0.2 parts by weight of an oil-soluble dye (manufactured by Orient Chemical Co., Ltd., product name: Bali 7 Asto Bratschna 3804) was added to 1 part by weight of ethanol.
After adding the dissolved parts by weight and thoroughly mixing, the mixture was dried.

Next, the treated titanium oxide was placed in a ball mill for 12 hours.
After time dispersion, additive particles for developer were obtained.

The obtained additive particles were subjected to a blow-off charge measuring device [electrophotography 16. (1977) 52, Journal of the Society of Electrostatics (1980)
) 134 etc.], the result was -64 μC.
/11.

Next, an example in which the developer additive particles of the present invention are applied to a toner will be described.

Low molecular weight polynorobicin (Sanyo Kasei Vircol 550P)
parts by weight, 0.5 parts by weight of ethylene vinyl acetate copolymer resin (Mitsui Polychemical Evaflex 220), and 0.1 parts by weight of Cargan Black (Mitsubishi Kasei MA-100) were heated and kneaded using a triple roll. . This mixed material was crushed by a hammer mill, then finely crushed by a jet mill, and classified to obtain a toner having a particle size of 5 to 30 μm.

The amount of charge on the toner was measured using the above-mentioned blow-off device and was found to be -8 μC/9 r. Further, in order to check the fluidity, the angle of repose was measured using A, B, D powder property measuring instruments (Tsutsui Rikagaku Kikai), and the result was that the fluidity was extremely poor at 58°. Furthermore, in order to examine cohesion, 20
As a result of an investigation using a 0 mesh sieve, it was revealed that as much as 48% of the toner remained on the mesh and had a high aggregation property.

Then, 0.1 part by weight of the developer additive particles was added to 1 part by weight of the toner, and the mixture was mixed in a ball mill for 4 hours to prepare a developer.

As Comparative Example 1, a developer was prepared by adding 0.1 parts by weight of titanium oxide which was not subjected to dye treatment to 1 part by weight of the above-mentioned toner.

The characteristics of the developer made only of the above toner (Reference Example), Comparative Example 1, and Example 1 were measured. The results are shown in Table 1 below.

The development characteristics were determined by replacing the developing device of a Toshiba copying machine BD-4511 with a non-magnetic component system as shown in the drawing. However, the fixing device is a pressure fixing device with a pressure of 200 kg/c.
It was fixed with a linear pressure of m. In the figure, 1 is a developer carrier that supports the developer and sends it to the electrostatic latent image, 2 is a stirring blade that stirs the developer and prevents agglomeration, 3 is a hopper for storing the developer, and 4 is a developer carrier. Developing bias, 5 is a regulating member that causes the developer to adhere uniformly and in a thin layer onto the developer carrier 1 and also triboelectrically charges the developer; 6 is a toner that is a developer; 7
1 is a selenium photoreceptor installed in the Toshiba copier BD-4511, and an electrostatic latent image 8 is formed on its surface. In addition, as for the developing conditions, the developing bias 4 is DC200.
V, Distance between developer carrier 1 and photoconductor 7: 200 μm 1 The circumferential speed of developer carrier 1 is the same as that of photoconductor 7, and the developer carrier 1 rotates with ease. Furthermore, in Table 1, the density is the value measured using a reflection densitometer (Macbeth RD-100), and the scattering is the presence or absence of separation of the developer composition from the toner.

Note that titanium oxide is mixed with 0.2 μm zinc oxide and 0.1 μm
Similar good results were obtained by changing to mini iron oxide. Moreover, even if the oil-soluble dye is changed to Oil Black+ 834 (trade name manufactured by Orient Co., Ltd.), the amount of charge is large.
A toner with good fluidity and coagulation properties was obtained. Furthermore, in the case of a positive polarity toner, a positive polarity developer can be obtained by using dyes such as nigrosine, Victoria blue, and methylene blue, which are biased toward the positive polarity in the charging order.

Example 1 part by weight of silicon dioxide having a particle size of 16 μm (trade name: Aerosil 130, manufactured by Nippon Aerosil Co., Ltd.) was taken and placed in a container.

Subsequently, 0.1 part by weight of an oil-soluble dye (Oil Yellow GG, manufactured by Orient Chemical Co., Ltd.) was dissolved in 10 parts by weight of toluene, added to a container, thoroughly mixed, and then dried with a spray dryer. When this was observed under a microscope, it was found that secondary aggregation occurred and many particles with a maximum of 5 particles were observed. To loosen this agglomeration, put it in Lumir and stir for 24 hours.
I observed it again under the microscope, but it did not become smaller than 1 μm.

Example 3 1 part by weight of silicon dioxide (trade name, manufactured by Nippon Aerosil Co., Ltd.; Aerosil 130) used in Example 2 was placed in a container, and an anthraquinone-based disperse dye having thermal sublimation properties (trade name, manufactured by Mitsubishi Chemical Industries, Ltd.) was added. Diamond Seriton Fast Yellow GM/
D) Added 0.1 heavy leaf portion and heated to 180° C. with stirring. After about 2 hours, the dye sublimated and sufficiently adhered to the silicon dioxide, which was then cooled and taken out. Example 2
When observed under a microscope in the same manner as above, no secondary curds were observed.

Next, an example in which the developer additive particles of Example 3 are applied to a toner will be described.

1 part by weight of low-molecular polyethylene (trade name: Sunwax 151P, manufactured by Sanyo Chemical Co., Ltd.), 1 part by weight of low-molecular polyamide resin (trade name, manufactured by Daiichi General Co., Ltd.; Persamide 940), and carbon black (trade name, manufactured by Mitsubishi Chemical Corporation; MA- 100) 0
．． Two parts by weight were heated and kneaded using three rolls, cooled, and then coarsely crushed using a hammer mill, finely crushed using a jet mill, and classified to obtain a toner having a particle size of 5 to 20 μm.

Next, parts by weight of the additive particles for developer were added to 100 parts by weight of the toner to prepare a developer.

Therefore, various characteristics of the developer of Example 3 were measured using the same means as in Examples. The results are shown in Table 2. In Comparative Example 2, silicon dioxide (trade name: Aerosil 1 manufactured by Nippon Aerosil Co., Ltd.) was added to 100 parts by weight of the above toner.
30) 1 part by weight was added and thoroughly mixed and stirred.

As is clear from Table 2 above, toners using polyamide resins are positively charged and are not suitable for use in selenium photoreceptors whose positive electrodes are charged.

However, silicon dioxide (charge amount: 380 μC/gr) and developer additive particles of the present invention (charge amount: -820 μqgr)
) The toner surface-modified by the method changes to a negative electrode and sufficient development is performed, and the larger the amount of charge, the better the effect. That is, while silicon dioxide is slightly scattered at an image area density of 1.0, the image area density of the developer containing the additive particles of the present invention is as high as 1.4, and there is no scattering at all.

The reason for this is thought to be that the additive particles for the developer have a large amount of charge and are quite strongly attached to the surface of the toner, and the amount of charge of the toner is also obtained by the adhering developer composition.

Example 4 Additive particles for a developer of the present invention were prepared in the same manner as in Example 3, using aluminum oxide (trade name: Aerotsil Aluminum Oxide C) manufactured by Nippon Aerosil Co., Ltd. having a particle size of 20 mμm instead of the silicon dioxide of Example 3.

When the charge amount of the obtained additive particles was measured, it was -120
It was μC/gr. The amount of charge on aluminum oxide is +
〇, 2 μC/ir, but the polarity has increased to negative polarity, but it is smaller than Example 3, and even if it is a fine particle, it must be selected to a certain extent when increasing the amount of charge.

That is, materials with relatively high specific resistance are preferred, and among these, colloidal silicon dioxide is the best.

Further, the developer prepared by adding 1 part of the additive particles for the developer of the present invention using aluminum oxide to 100 parts by weight of the toner prepared in Example 1 and Example 3 was as follows. Although it was a long and young child for toner, Example 3
With respect to the toner, the charge amount did not become negative, and the development appearance was not good.

Example 5 Additive particles for a developer were prepared using Kayalon 7 Astred R (trade name, manufactured by Nippon Kakei Co., Ltd.) in place of the disperse dye in Example 3, and the charge amount of the additive particles was -680 μC.
/ 9 r, it was strongly charged to negative polarity.

When the obtained additive particles were added in an amount of 0.5 parts by weight to 100 parts by weight of the toner used in Examples 1 and 3, a developer with a large amount of charge on the negative electrode and good fluidity was obtained.

Example 6 Kayaset Blue F12 (
When additive particles for a developer were prepared in the same manner using Nippon Kakei Co., Ltd. (trade name), the amount of charge was -535 μC/gr.

The obtained additive particles were placed in an atmosphere of 60% RH and 25°C for 7 days.
As a result of leaving it for 2 hours, the amount of charge decreased to 1257 μC/gr.

Similarly, Aerosil 130 (product name manufactured by Nippon Aerosil Co., Ltd.)
When I also tested it, the amount of charge dropped to 1310μV, 9R. However, it has become clear that the change in the additive particles for a developer of the present invention treated with a dye is greater.

In addition, the developer prepared by adding moisture-absorbed additive particles for developer in parts by weight to 100 parts by weight of the toner prepared in Example 3 had a charge amount of -2 μC/9r, an angle of repose of 45°, and a degree of cohesion of 23%.
It did not show very good results.

Example 7 10 parts by weight of the additive particles immediately prepared in Example 6 were placed in a sealed container, and the pressure was reduced to 10 rranHJ. 0.1 part of heated dimethyldimethoxysilane was added to the mixture, heated to 100°C, and then returned to normal pressure to remove the methyl alcohol produced by the reaction. Next, 70.1 parts by weight of trimethyldimethoxysilane, which had been heated under reduced pressure to 10 mmHJ, was added thereto, heated to 100° C., air was introduced, and the pressure was returned to normal pressure by repeating this operation several times to effect hydrophobization. The hydrophobization is eliminated by reacting silanol groups on the surface of the developer composition with dimethyldimethoxysilane;
This is carried out by depositing a low molecular weight dimethylpolysiloxane in which dimethyldimethoxysilane has reacted with itself.

In other words, VH3g! ■(CH3)25i(OCH3)z+2H2o-+(c
H,)2st(oH)2+zcH3oa.

The thus hydrophobized developer additive particles were left in a 60% atmosphere at 25° C. for 72 hours in the same manner as in Example 6, and then the amount of charge was measured to examine humidity dependence. As a result, the amount of charge was -720 .mu.C/17r, which was greater than the value immediately after treatment with the disperse dye of -535 .mu.C//ir.

Furthermore, after being left in an atmosphere of 85° RH and 25°C for 168 hours, the amount of charge was measured, and the result was -701 μC/9
There was almost no humidity dependence on r.

Then, 0.5 parts by weight of the hydrophobized developer additive particles were added to 100 parts by weight of the toner prepared in the example, and mixed well in a ball mill to prepare a developer.

The characteristics of this developer were measured in the same manner as in Example 1, and the results showed that the charge amount was -23 μC/9r, the angle of repose was 32°, and the degree of cohesion was 2 cycles. Image area density was 1.4, and non-image area was 0.08. A clear image with no capri was obtained.

Moreover, there is no scattering of developer from the developing device at all.
It has been found that adding hydrophobized developer additive particles to the toner is very effective.

Note that similar good effects were obtained by using trimethylchlorosilane, dimethyldichlorosilane, methyltriethoxysilane, dimethylpolysiloxane with a degree of polymerization of about 10, etc. instead of dimethyldimethoxysilane.

Example 8 Colloidal silicon dioxide with a primary particle diameter of 1 mμ as fine particles (trade name: Aerosil 300, manufactured by Nippon Aerotsuru Co., Ltd.) 1
Place the heavy electrical parts in a container and add anthraquinone disperse dye (Nippon Kayaku Co., Ltd. product name: Kayalon 7 Asto Blue BR).
0.1 part by weight was added and heated to 150° C. for about 4 hours while stirring.

Thereafter, the pressure was reduced to 10 mmH9 while cooling and maintaining the temperature at 100°C, and 0.01 part by weight of hexamethyldisilazane (Toshi Silicone S, 1-16079) was added and stirred for 30 minutes. Furthermore, air was introduced and the pressure was returned to normal, and the ammonia gas produced by the reaction was removed to obtain the hydrophobized developer additive particles of the present invention.

As a result of measuring the amount of charge of the obtained developer-added particles, the result was +4.
The positive electrode showed a strong chargeability of 42 μC/gr.

Furthermore, even after being left in an atmosphere of 85% RH and 25° C. for 168 hours, the result was +423 μC/fir, showing no humidity dependence.

In addition, low molecular weight polyethylene (Sanyo Chemical Co., Ltd. product name: Sunwax 171P) is crushed and classified to produce an average particle size of 1.
A toner was prepared by creating a powder of 0 μm. Continuing,
100 parts by weight of this toner and 30 parts by weight of the hydrophobized developer additive particles were placed in a ball mill and mixed for about 48 hours to prepare a blue color developer.

As a result of measuring each characteristic of the color developer in the same manner as in Example 1, the charge amount was +9 μC/! 9r, angle of repose 33°, and degree of cohesion 5%. When the selenium photoreceptor was replaced with a zinc oxide photoreceptor and development was carried out at an electrostatic latent image potential of -500 V, a clear dark blue image with a density of 1.2 and little fog was obtained.

When Diamond Ceritone Fast Scarlet (RM/D) (trade name manufactured by Mitsubishi Kasei Corporation) was used in place of the above disperse dye, a red color toner with a large charge amount, good fluidity, and agglomeration resistance was obtained. Ta.

Still, Miketon Discharge Yellow 3G in the same way.
(trade name, manufactured by Mitsubishi Kasei Corporation), a yellow color toner was obtained.

In addition, instead of hexamethylsosilazane ((CH3)5
SiNH)28 i (CH3)2 , [(CH!,
)58 i ]2NCH5 also provided a hydrophobized developer composition of the present invention.

Furthermore, when hydrophobic colloidal silicon dioxide (trade name: Aerosil R972, manufactured by Nippon Aerotsuru Co., Ltd.) with a primary particle diameter of 16 m .mu.m is used as fine particles, good additive particles for development can be obtained.

〔Effect of the invention〕

As detailed above, according to the present invention, stable and fluid
It is possible to provide additive particles for a one-component developer useful in a one-component non-magnetic development method that has excellent agglomeration resistance and is capable of efficient triboelectric charging, as well as a method for easily producing such additive particles. In addition, by using a method in which a heat-sublimable disperse dye is used as a dye and the dye is stuck onto the surface of fine particles, it is possible to economically and safely obtain fine additive particles for a developer, and also to make it possible to obtain particles that are mixed with a toner. In this case, a developer with better fluidity and agglomeration resistance can be obtained.

[Brief explanation of the drawing]

The drawings show non-magnetic particles to which the developer additive particles of the present invention are applied.
FIG. 2 is a schematic diagram showing one form of a component system and a developing device. DESCRIPTION OF SYMBOLS 1... Developer carrier, 2... Stirring blade, 3... Hopper, 4... Development bias, 5... Regulating member, 6
...Developer, 7...Photoreceptor, 8...Electrostatic latent image.

Claims (9)

[Claims] (1) Additive particles for a developer, which are made by adhering a dye to the surface of fine particles with a particle size of 1 μm or less. (2) The additive particles for a developer according to claim 1, wherein the fine particles are made of colloidal silicon dioxide. (3) The additive particles for a developer according to claim 1, wherein the dye is a heat-sublimable disperse dye. (4) Mixing fine particles with a particle size of IIJ4n or less and a dye,
A method for producing additive particles for a developer, which comprises heating the particles to cause the dye to adhere to the surface of the particles. (5) The method for producing additive particles for a developer according to claim 4, wherein the fine particles are made of colloidal silicon dioxide. (6) 1 [Method for producing additive particles for criminal use] according to claim 4, wherein the dye is a heat-sublimable disperse dye. (7) Fine particles with a particle size of 1 μm or less and a dye are mixed, heated to adhere the dye to the surface of the fine particles, and then V-hydrated with an organic silicon compound. 7. A method for producing additive particles for a developer according to any one of items 6 to 6. (8) The organic silicon compound has the general formula % [However, R in the formula is a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an alkenyl group having the same number of carbon atoms, or a phenyl group, n
is an integer of O to 3; Y is the same as a halogen atom, an alkoxy group, or an acetoxy group, and may be the same or different; t is an integer of 1 to 100; and m is an integer of 1 to 3. In addition,
m-1-n never exceeds 4. ) The method for producing additive particles for a developer according to claim 7, characterized in that the additive particles are as follows. (9) The organic silicon compound has the general formula % formula % [However, R in the formula represents an alkyl group having 1 to 4 carbon atoms,
They may be the same or different. ] The method for producing additive particles for a developer according to claim 7, characterized in that the additive particles are as follows.