JPS6366566A - One component toner - Google Patents

Abstract

PURPOSE:To obtain the titled toner capable of injecting electric charge to the toner at the top of a magnetic brush due to a conductive layer at the time of developing and transferring due to adhesive strength of a wax layer by providing the low m.p. wax layer and the conductive layer on the surface of the magnetic toner. CONSTITUTION:The one component magnetic toner 1 has a structure of coating the low m.p. wax layer 7 and the conductive layer 6 on a toner nucleus 5 which is obtd. by dispersing a magnetic material 3, a pigment 4 and another additives in a binder resin 2, in this order. The thickness of the layer 7 is preferably 0.5-2mum, and that of the layer 6 is preferably 0.1-0.5mum. The development is effected by carrying the toner due to the magnetic brush utilizing the magnetic agent 3 contd. in the toner nucleus 5, and by injecting the electric charge into the toner 1 due to the layer 6 respectively. The transfer is effected by melting the layer 7 due to heating it. Thus, the toner 1 capable of effecting the image formation and the transcribing at the same time is obtd.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to electrostatic charge developing component toners.

[Conventional technology]

In recent years, xerography technology? Various printing devices have been put into practical use and are now in use. To give an overview of the toners used in this technology, in the case of printing devices using the "curl-in process," in the current two-component magnetic brush method and float electrode effect implementation method (IFKID method), insulating non-containing toners are used. FiB toner, insulating ei magnetic toner is used in the jumping current iron method, and conductive solar eclipse toner is used in the case of electrofax. Furthermore, as proposed in JP-A-59-220749, a toner having 4711 is used, and instead of being transferred directly to transfer paper, it is transferred to a transfer roller and then heated via the transfer paper. There is a method of transferring by applying pressure.

Recently, a new method (hereinafter referred to as the "simultaneous method") using a new xerographic technology that simultaneously performs exposure and development to form an image has been developed, which has the potential to greatly simplify the process. It was studied in various places, and if it was enclosed, it would be
57 has been proposed.

In this method, it is considered that the optimum developing method is to rub the surface 1 of the image forming body comprising the photoconductor layer with a brush of conductive magnetic toner to which a bias voltage is applied during exposure. When the photoconductor acts as an insulator (
There is a difference in the amount of charge injected into the toner that is in contact with the surface of the image forming body due to the bias voltage between the unexposed area) and the time when it acts as a conductor (light area), and the difference in the amount of charge is The difference in electrostatic adhesion force to the surface of the toner makes it possible to form toner dots.

[Problems and objects to be solved by the invention] However, when using conductive toner, due to its conductivity, the electric charge of the toner is neutralized in a short relaxation time, and the residual electric charge is lost, causing the paper to lose its charge. Since the electrostatic adhesion force is lost, the well-known electrostatic transfer method cannot transfer the image to paper sufficiently, and methods using a transfer roller or the like have the disadvantage that the process becomes complicated.

So, does the present invention solve these problems? It solves
The purpose is to provide a toner for use in printing devices utilizing the simultaneous process. Specifically, it is an object of the present invention to provide a toner that can be used to form images in a simultaneous method and that can be transferred to plain paper.

[Means for solving problems]

The electrostatic charge developing toner of the present invention has two metal layers, a low melting point wax layer on the surface and a conductive layer, and the thickness of the low melting point wax layer is 0.5 μm to 2 μm;
The conductive layer has a thickness of 0.1 μm to 0.5 μm, and the toner is an m-injection toner.

[Effect]

According to the above structure of the present invention, the electric charge injected into the toner at the tip of the magnetic brush during development in the simultaneous method is coated on the low melting point wax layer on the toner surface. The transfer to paper is performed using a conductive layer, and the wax is melted through the gap between the four layers by heating through the conductive layer, and the adhesive force of the wax can be used.

〔Example〕

FIG. 1 is a cross-sectional view of a toner according to an embodiment of the present invention. The toner 1 according to the present invention shown in FIG. 1 contains a magnetic agent 3 in a binder resin 2. A low melting point wax layer 6 with a thickness of 0.5 μm to 2 μm is applied to the toner core 5 in which the pigment 4 and other additives are dispersed.
and a conductive layer 7 with a thickness of 0.1 μm on top of it.
It is a neighboring structure coated with ~0.5 steel. The binder resin is preferably a commonly used thermoplastic resin, such as polystyrene or a copolymer thereof.

It is preferable to use polyester and its copolymers, acrylic resins, vinyl resins, etc. alone or in combination in an amount of 40 wt% to 60 wt% based on the total amount of the toner. It is Ia type powder. Triiron tetroxide, γ-ferric oxide, chromium dioxide, nickel ferrite, iron alloy powder, etc. 14; 40 wt
Charge 4 is preferably used in a range of 1 to 80 wt%.
It is preferable to use carbon black, spirit blank, nigrosine, etc. in a range of 1 to 3 wt.

In addition, other additives include flowability and improving agents (870
, Tiel, etc.) at 0.1 wt% to 0.5 w
It is preferable to add the wax at a temperature of 40 to 50°C.

It is preferable to use a material that significantly reduces viscosity.Furthermore, as the conductive layer, it is preferable to use carbon black (particle size 0.1 μm to 0.5 μm), which is a known conductive agent.Use the above raw materials. Then, the toner core 4 is formed into a particle size of 10 μm to 1 μm by the commonly performed kneading, pulverizing, and classifying steps.
The 9th grade low melting point wax to produce 5 μm powder ft was cooled and pulverized to a particle size of 0°11111 to 0.5 μm.
Mix it with the toner core powder and apply a mixing treatment using a ball mill to coat the surface of the toner core with a low melting point wax layer. 1. Next, mix the toner powder coated with this wax layer with carbon black and do the same. To,
On the surface of the low melting point wax layer by ball milling.

Coat the conductive layer with carbon black. Furthermore, one-surface coating is not limited to a ball mill, but can also be done by hot air flow.

FIG. 2 shows a state in which genyō is made by the simultaneous method using the toner according to the present invention. In FIG. 1, the same elements as in FIG. 1 are given the same numbers. Photoconductor layer lO1 transparent conductor 11. A photoreceptor 13 made up of transparent support layers 12 laminated in this order is exposed to light 15 while moving in the direction of an arrow 14 . Due to the magnetic nature of the toner, a well-known magnetic brush formed using a magnetic roller 16 and a sleeve 17 is used.
), the toner l is in contact with the photoquaternor layer 10 in the exposed area. Since a bias voltage 18 is applied to the sleeve 17, the toner in contact with the photoconductor layer has a 4-electrode property on the toner surface. r: Electric charge is injected throughout the wax layer 6 shown, but the amount of injection is different between the exposed and unexposed areas, resulting in a difference in the electrostatic adhesion force of the toner to the surface of the photoconductor layer 1O, which causes a difference in development. will be carried out.

FIG. 3 shows how the toner of the present invention is transferred by a thermal transfer method. In FIG. 0, the same elements as in FIG. 2 are given the same numbers. The transfer paper 19 is superimposed on the exposed surface of the photoreceptor 130, and the heat roll 20 is applied from the back side of the #'L1 transfer paper.

Heat the transfer paper so that the toner transfer side reaches 40 to 50°C, and then heat the conductive layer on the toner surface. The wax is melted through the toner, and the toner is transferred onto the paper by the adhesive force of the wax.The toner is not sufficiently fixed as it is, so it is necessary to carry out normal fixing.

[Implementation! 11] Acrylic resin (Acrivet, Mitsubishi Kasei) 4909, which is Atsumachi silkworm resin. Magnetic powder triiron tetroxide (KPPzo
oo, Toda Kogyo) 450F, carbon black (Lion Co., Ltd.) 502 as a pigment, flow Stt improvement coloring agent ho, and powder (Aerosil) 1Of' were mixed on a scale and kneaded using a screw extruder. Thereafter, the mixed material is coarsely ground to O01 to 0.5 wa using a stamp mill. This coarsely pulverized material is passed through a jet mill and pulverized to a size of 5 to 30 μm. Furthermore, the toner core was classified to 10 to 15 μm using a dry sieve classifier and the toner core was t-split.
Cool and crush into a sickle that becomes 0.5 dragon. Mix 10ort of the above toner core with this and use a ball mill.

A wax layer is coated on the surface of the toner core.

Next, toner powder 1 coated with the above wax layer
A carbon blank 10F was mixed with 00f, and a conductive '6i layer was coated on the surface of the wax layer using a ball mill to produce a -component fl type toner. At this time, the thickness distribution of the wax layer was 1 to 2 μm, and the thickness distribution of the conductive layer was 0.1 to 0.3 μm. When the image was fixed, a good fixed image could be obtained.

[Example 2] Toner cores were produced using the same raw material composition and method as in Example 1, and low melting wax (HN) 9 was further cooled and pulverized.
．． Toner core 1002 and wax powder 200 are crushed to have a particle size of 0.1 U or less (Japanese steamer).
ft mixed and stirred, and the mixture was sprayed into a hot air stream of 50° C. each time at a rate of l Om/sec to coat the surface of the toner core with a wax layer. 1st K): 100f of toner cores coated with wax Mix 20y of carbon black with it, stir well, and add m
A conductive layer of carbon black was coated on the surface of the wax layer of the toner core by spraying in a hot air stream at a temperature of 70° C. at a rate of 73/Sec to produce a -component magnetic toner. At this time, the thickness distribution of the wax layer was 1 to 2 μm, and the thickness distribution of the conductive layer was 0.3 to 0.5 μm.First, using this one-component Ia toner, the phenomenon, transfer, and fixing were performed by the simultaneous method. When this was carried out, a good fixed image could be obtained.

[Implemented [3'1J3] Thermoplastic! Il: Resin polystyrene resin (Styron, Asahi Kasei) 4509. Magnetic powder γ-ferric oxide 5
30? *Nigrosine (Orient Chemical) as a pigment
20 fl ft of scale, mix and knead in a screw extruder. After that, the kneaded stuff? 0.1-0.5su with stamp mill
Coarsely grind to +. This coarsely pulverized product was pulverized to 5 to 30 μm using a jet mill, and further classified to 10 to 15 μm using a dry sieve classifier to form toner nuclei.

Next, low melting point wax (HNI'9. Nippon Seiro) 100
2 is cooled and pulverized to a particle size of 0.1 to 0.5 u.

Mix this with toner cores 100f, and use a ball mill to coat the surface of the toner cores with a wax layer.
0f was mixed with 202t of carbon black, and a conductive layer was coated on the surface of the wax layer using a ball mill to produce a -component 6 toner. At this time, the thickness distribution of the wax layer is 0.5 to 1 μm, and the thickness distribution of the conductive layer is 0.
．． This one-component magnetic toner with a primary diameter of 3 to 0.5 μm? Using the simultaneous method, the current [j! , transfer, and fixing were carried out, and a good constant M density could be obtained.

[Example 4] Toner cores were produced using the same raw material composition and method as in Example 3, and then cooled and pulverized to form a low melting point wax (HN').
'9. First, the toner nucleus 1002 and the wax powder 2501'ft were mixed and stirred to reduce the % nuclear crystal compound to 15 m/1.
Injected into a hot air stream with a temperature of 60 degrees Celsius at the speed of sea,
Coating a wax layer on the surface of the toner core. 1. Next, mix carbon black 3Of into the toner core Loot coated with the above wax and stir well. The surface of the wax 15 of the toner core is coated with a conductive layer of carbon black by spraying it into a hot air stream of -component Eii.
A sex toner was produced. At this time, the thickness distribution of the wax layer was 1 to 2 μm, and the thickness distribution of the conductive layer was O81 to O03 μm.8 Next, development, transfer, and fixing were performed by the simultaneous method using this one-component toner. , I was able to obtain a good constant H image.

[Comparison column]

A one-component toner was produced in the same manner as in [actual row A] except that the amount of wax and the Mk of carbon black were changed.

[Comparison row 1] Table 1 shows the results when the wax amount and carbon blank amount of (practical row 1) were varied.

Table 1 [Comparison column 2] [¥2iIl! Table 2 shows the results when the amount of wax and carbon black in [Row 1, Row 2] were varied.

Table 2 [Comparison row 3] Results when changing the amount of wax and carbon black in [Actual BM row 3]? Shown in Table 3.

Table 3 [Comparative row] Wax amount and carbon black needle in [Executive row 4]? Table 4 shows the results when changing the temperature.

Table 4 It is clear from the results of [Comparison Column 1] to C Comparison Column 2]
If the thickness of the wax layer is 2 μm or more, a large amount of wax will soak into the paper during transfer, which is undesirable, and if the wax layer thickness is 0.5 μm or less, the amount of wax necessary for transfer cannot be obtained, which is undesirable. .

Furthermore, if the thickness of the conductive layer is 0.58 Φ or more, the wax will be difficult to dissolve on the surface and transfer will not take place.

The thickness of the conductive layer is 0. If the IJ is less than 1 m, the conductivity decreases and development is not performed, which is not preferable.

C Effects of the Invention] As described above, according to the present invention, a wax layer is coated on the surface of the -component magnetic toner for electrostatic charge development, and carbon black is further coated on the surface of the magnetic toner. By imparting properties, the development is done using magnetic powder dispersed in the toner core? The transfer is performed by transporting the toner using a magnetic brush and injecting 76 charges into the toner by a conductive layer on the surface of the toner. Transfer is performed by heating through the conductive layer, melting wax in the gaps in the conductive layer, and using its adhesive force. , it is possible to realize a one-component magnetic toner that can utilize both charge injection development and thermal transfer methods. Furthermore, since this toner has a carbon black layer on its surface, fluidity is improved. Is this one toner? If used at the same time, it will not be affected by humidity or temperature, and can perform two good transfers, greatly simplifying the process. J crystal 4 is realized color 4゜

[Brief explanation of the drawing]

Fig. 1 shows the implementation sequence of toner in the present invention? Figure shown, second
FIG. 3 is a diagram showing how the toner of the present invention is used for simultaneous development, and FIG. 3 is a diagram showing how the toner of the present invention is transferred by the thermal transfer method. 1...-component m-type toner 2-@-binder tree II effect 3-φ・IiB-type agent 6-#-conductive agent 7...wax layer 10--φ photoconductive layer 12Φ...transparent support 1311・'e Photoconductor 19 ・＠-Transfer paper addition...heat roll and applicant Seiko Epson Co., Ltd. agent Tsutomu Mogami, patent attorney, and 1 other person Figure 1 ↑↑↑7s-114

Claims (4)

[Claims] (1) A one-component toner for electrostatic charge development, characterized by having two layers: a low-melting wax layer on the surface and a conductive layer thereon. (2) The one-component toner according to claim 1, wherein the low melting point wax layer has a thickness of 0.5 μm to 2 μm. (3) The one-component toner according to claims 1 and 2, wherein the conductive layer has a thickness of 0.1 μm to 0.5 μm. (4) The one-component toner according to claims 1, 2, and 3, wherein the toner is a magnetic toner.