JPS6330861A - One component type toner - Google Patents

Abstract

PURPOSE:To obtain a toner usable for a printing device applying a simultaneous process by coating the surfaces of toner core particles with a low-melting wax in a specified thickness. CONSTITUTION:The toner core particles 5 are prepared by dispersing a magnetic material 3, a pigment 4, and other additives into a binder resin 2 and granulating them, and the electrostatic charge developing one component type magnetic toner 1 is obtained by coating the core particles 5 with the wax layer 7 containing a conductive agent 6 in a thickness of 0.1-2mum in a hot air stream, thus permitting the toner 1 to be conveyed by a magnetic brush using a magnetic material dispersed in the toner cores, the charge to be injected by using the conductive wax layer 7 of the toner 1, development to be thus executed, and after transfer, fixing to be carried out by melting the wax with heating and using its adhering force, and this one component type magnetic toner 1 to realize both of charge injection development and heat transfer at the same time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a one-component toner for electrostatic charge development.

[Conventional technology]

In recent years, various printing devices using xerography technology have come into practical use. To give an overview of the toners used in this technology, in the case of printing equipment using the "Carlson process", insulating non-magnetic toners are used in the two-component magnetic brush development method and the float electrode effect development method (FEED method). In the case of toner, a magnetic toner h'= is used in the jumping development method, and in the case of an electrofax, a conductive magnetic toner is used. Furthermore, as proposed in Japanese Patent Application Laid-Open No. 59-220749, conductive toner is used, and instead of being transferred directly to transfer paper, it is transferred using a transfer roller and then transferred through the transfer paper. , method of transferring by applying heat and pressure h
″-There is.

Recently, a method using a new xerography technology that forms images by performing exposure and development simultaneously (hereinafter referred to as the simultaneous method) has the potential to greatly simplify the process.
I'l:, It has been studied in various places.
3957 K proposed stone. In this method, it is considered that the optimum development method is to apply a bias voltage and rub the surface of the image forming body including the photoconductor layer with a brush of conductive magnetic toner during exposure. , when the photoconductor acts as an insulator (unexposed area) and when it acts as a conductor (i!light), the toner in contact with the surface of the image forming body is injected by a bias voltage. Charge 'lt
The difference in charge amount causes a difference in the adhesion force to the surface of the image forming body, and the toner image formation becomes possible.

[Problem that the invention seeks to solve]

However, when using conductive toner, due to its conductivity, the charge on the toner is neutralized in a short relaxation time and loses its residual charge and electrostatic adhesion to paper. The transfer method has the disadvantage that sufficient transfer to paper is not possible, and methods that use a transfer roller or the like complicate the process.

Therefore, the present invention aims to solve these five problems.
The objective is to provide a toner for use in nine printing devices using the simultaneous process. Specifically, image formation is possible in the simultaneous method, and transfer to plain paper h;
Our goal is to provide a foundation that allows you to do the same.

[Defined valve leaflets that solve problems]

In the electrostatic charge developing toner of the present invention, coating the surface with a low melting wax of α1 μm to 2 μm,
The low melting point wax coating layer is electrically conductive, the low melting point wax coating layer is formed by hot air flow, and the toner is a magnetic toner.

[Effect]

According to the above configuration of the present invention, in addition to the simultaneous method, charge injection into the toner at the tip of the magnetic brush at the time of scratching can be performed using the conductive wire coated on the toner surface. The wax layer is used to transfer the image to the paper, and the wax is melted by heating, and the adhesive force of the wax is used to transfer the image to the paper.

〔Example〕

FIG. 1 shows a cross-sectional view of a toner in an embodiment of the present invention. 1 piece of toner in the present invention, binder tree ￥fI2
A wax layer 7 containing a magnetic agent 3, a toner core 5K in which a pigment 4 and other additives are dispersed, and a conductive agent 6 is added at 0.1
It has a structure of 7t coated on important figures of μm to 2 μm. The binder resin is preferably a commonly used known thermoplastic resin, such as polystyrene and its copolymers, polyester and its copolymers,
It is preferable to use polyethylene 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. The magnetic agent 3 is a known m-column powder.

Triiron tetroxide, r-ferric oxide, chromium dioxide, nickel ferrite, iron alloy powder, etc. aOwt4~80wt
It is preferable to use the range of %.

As the pigment 4, it is preferable to use carbon black, spirit black, nigrosine, etc. in a range of 1 wt to 10 wt. Other additives may also be used to improve fluidity or improve the north side (SjO, rz:o2, etc.). α1
It is preferable to add in a range of wt4 to C1.5wt4. As for wax, in the range of 40~50℃,
It is preferable that the viscosity is significantly reduced. Furthermore, the conductive agent dispersed on the surface and inside of the Wadx layer is a known conductive agent such as carbon black. 30u for the total amount of wax
It is preferable to add it in a range of +t4 to 70 wt%. Using the above-mentioned raw materials, the toner core 4 is produced into a granular material having a size of 10 μm to 15 μm by the usual methods of mixing, crushing, and classifying. Next, by cooling and pulverizing, a low melting point wax having a particle size of CL1wm or less, KL, the above-mentioned toner cores, and a predetermined amount of a conductive agent are added and mixed by stirring. Next, mix these mixtures at a temperature of 2
20 to 50 Vse in hot air flow at 00℃ to 300℃
The mixture is sprayed at a speed of c to coat the surface of the toner cores with a layer of electrically conductive wax.

FIG. 2 shows how the toner of the present invention is used for simultaneous development. In the figure, the same elements as in FIG. 1 are numbered the same. Photoconductor layer 10. When the photoreceptor 13 laminated on the transparent conductor layer 11 and the transparent support layer 120 moves in the direction of the arrow 14, it is exposed to light 15. Due to the magnetic nature of the toner, a well-known magnetic brush formed using a magnet roller 16 and an IJ-brush 17 is used to contact the photoconductor layer 10 at the exposed portion. Since a bias voltage 18 is applied to the sleeve 17, a charge h is injected into the toner in contact with the photoconductor layer through the conductive wax layer 6 on the surface of the toner. In the exposed area, the injection fh is different, resulting in a difference in the adhesion force of the toner to the surface f of the photoconductor layer 1a, and the process shown in FIG. 9 is performed.

FIG. 3 shows how toner is transferred by a thermal transfer method in the present invention. In the figure, the same elements as in FIG. 2 are numbered the same. A transfer paper 19 is placed on the developed surface of the photoreceptor 130, and a heat roll 201C is applied from the back side of the transfer paper.

The toner transfer side of the transfer paper is heated to 40 to 50°C to melt the wax on the surface of the toner, and the toner is transferred to the toner paper by the adhesive force of the wax. Next, if this continues,
The toner is not fixed enough, so is it normal fixation? It is necessary to do it.

〔Example〕

Example 1 Acrylic resin (Acrivet, Mitsubishi Chemical @) a9oy, which is a thermoplastic resin, triiron tetroxide (KPP 2), which is a magnetic powder
000, Toda Kogyo) 450! ? , pigment (conductive agent)
50 g of Carbon Gra-I (manufactured by Lion Corporation) and 10 g of SiO2 powder (Aerosil) as a fluidity improver were weighed and mixed, and kneaded using a screw extruder.

Thereafter, the kneaded material is coarsely ground to 0.1 to 0.5 fl using a stamp mill. This coarsely ground one? Grind to 5-30 μm using a jet mill. Furthermore, toner cores are produced by classifying them into 10 to 15 μm using a dry sieve classifier (No. 7).Next, 75 g of wax (HNP9. Nippon Seiro) is weighed and cooled and crushed to a particle size h of 11.1 n1 or less. Next, 100y of the above toner cores, 75g of wax powder, and 75g of carbon black are mixed and stirred.The mixture is heated at a speed of 20 l'sec at a temperature of 200g.
Atomize ## in a hot air stream to coat the surface of the toner core with a wax layer to produce a one-component magnetic toner. Next, using this one-component magnetic toner, development and
When transferring and fixing, it was possible to obtain a good fixed image.

Example λ Polystyrene resin (Styron, Asahi Kasei) as a thermoplastic resin aqua, y + 4 oo g of r-ferric oxide as a magnetic powder, 1 oo y of spirit black (Orient Chemical) as a pigment were weighed, mixed, and screw extruded. Knead with a machine. After that, the kneaded material was milled with O11 in a stamp mill.
~0.5 IJK coarse grinding. This coarsely pulverized material is pulverized to 5 to 30 μm using a jet mill. Furthermore, toner cores are produced by classifying them into 10-15 μm particles using a stem-type sieve classifier. Next, wax (YoNP9 Nippon Seiro) 5C1' was weighed and cooled and crushed until the particle size was 0.10.
Grind it to the following size.

Next, 100 g of the above toner core and 50 g of wax powder,
Carbon black 1001 is mixed and stirred. The mixture was sprayed at a speed of 30 m/sec into a hot air stream at a temperature of 500'C to coat the surface of the toner cores with a wax layer to produce a highly differentiated magnetic toner; Next, try this one-component magnetic toner! ! Next, using this one-component magnetic toner, development, transfer, and fixing were performed using the simultaneous method. It is possible to obtain an Il image.

〔Effect of the invention〕

As described above, according to the present invention, by coating the surface of a one-component magnetic toner with conductivity in a hot air flow,
Development is carried out by a magnetic brush that uses magnetic powder dispersed in the toner core, and a conductive wax layer on the surface of the toner injects charges into the toner, resulting in stone-free development.
Transcription-'8! Since the process is performed by melting the wax and using its adhesive strength, it is possible to realize a one-component magnetic toner by using both charge injection development and thermal transfer methods. As a result, when used in a 5-toner simultaneous method, good transfer can be performed without being affected by humidity, and the process can be greatly simplified, making it possible to realize a compact printing pack.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the toner according to the present invention, and FIG.
The figure shows the current image obtained by the simultaneous method using the toner of the present invention.
; A diagram showing how it is done. FIG. 3 is a diagram showing how toner is transferred by a thermal transfer method in the present invention. 1... One-component magnetic toner 2... Binder resin 3... Magnetic agent 6... Conductive agent 7... Wax layer 10... ...Photoconductive layer 12 ...Transparent support 13 ...Photoreceptor 19 ...Transfer paper 20 ...Heat roll Source: Seiko Epson Co., Ltd. Figure 1, Figure 1, Figure 2

Claims (4)

[Claims] (1) A one-component toner for electrostatic charge development, the surface of which is coated with a refractory wax of 0.1 μm to 2 μm. (2) The one-component toner according to claim 1, wherein the low melting point wax coating layer has electrical conductivity. (3) The one-component toner according to claims 1 and 2, wherein the low melting point wax coating layer is formed by hot air flow. (4) The one-component toner according to claims 1, 2, and 3, wherein the toner is a magnetic toner.