JPS6350856A - Magnetic color toner - Google Patents

Abstract

PURPOSE:To obtain the tilted toner capable of coloring to all colors, and coloring from a pale to thick colors and transparent color by sticking a material having a thicker color than that of a magnetic powder or a magnetic fine piece to the surface of the magnetic powder and the magnetic fine piece having at least more than one kind of the optical characteristic selected among a colorless, a transparent and a pale colors. CONSTITUTION:The titled toner comprises the fine powder or the fine piece of the magnetic body 1 having at least >=1 kind of the optical characteristic selected among the colorless, the transparent and the pale colors. On the surface of the fine powder and the fine piece, the various kinds of colored material is stuck. Thus, the titled toner can be easily colored to an optional color, and controlled the density of the coloring, a transparent feeling and a opaque feeling by varying a particle size of said magnetic powder, etc. And the adhesive strength of the printing toner after transfer-printing is increased by making the toner to a plate, without almost injuring a color tone of a dyestuff and a pigment, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color toner structure for a magnetic printer that selectively attaches and transfers magnetic toner.

[Conventional technology]

Conventional toner for magnetic printers is mainly made by dispersing magnetic fine powder such as ferrite in an aqueous solution and oil.

[Problem that the invention seeks to solve]

However, conventional toner is magnetic and has a black or brown color, and because it is printed in color with a magnetic printer, it is necessary to add dyes and pigments to achieve a very high density. There was also a drawback that the coloring was dark.6 Also, for this reason, even if color printing was performed on a transparent sheet, it would not be transparent with transmitted light and slide projection could not be performed.
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The present invention solves the above-mentioned drawbacks, and its object is to provide a magnetic color toner that can be colored in any color, from light to deep and transparent.

[Means to solve the problem]

The magnetic color toner of the present invention uses fine particles of a magnetic material having at least one type of optical property among colorless, transparent, and light-colored, and variously colored materials are applied around the particles. Features and Effects [According to the above configuration 1 of the present invention, in order to prevent the color of the magnetic material from affecting the surrounding colored materials to become black, #coloring materials can be used freely. You can select and color only one.

〔Example〕

Embodiment FIG. 1 is a partial sectional view showing the structure of a magnetic color toner according to an embodiment of the present invention. Magnetic material 1 digit yttrium
Single crystal and polycrystals of gallium garnet material are crushed into fine powder and then heated at 150°C to 950°C for 1 hour.
It was used with improved magnetic properties that did not impair 24-hour annealing. The temperature and timing of the annealing are varied depending on the pulverization conditions of the m-like material 1 and the particle size of the fine powder to obtain predetermined magnetic properties. The colored layer 2 is composed of a dye and a binder material, and after being melted and mixed with the magnetic material 1, it is ejected in a mist form into a low-temperature atmosphere, or ejected with the generation of clusters in a vacuum, or the dye and binder are mixed together. After dissolving the materials in an appropriate solvent, the magnetic material 1 is mixed and vacuum freeze-dried to form a layer on the surface of the magnetic material 1 with a thickness of ±[11 μm ~
10 am K formed and used as binder material, natural wax with carbon number of 15 or more is used by mixing synthetic waxes with different molecular weights and controlling the melting temperature to a predetermined value.
A polyester resin, a styrene resin, a paraffin resin, a glycol ester resin, and a surfactant having a melting point of 70° C. or higher and 200° C. or lower were used alone or in combination. The dyes are C, L Acid Red 254 and C, L Acid Red 289 for red printing, C1 and Direct Blue 86 for blue printing, C0, Direct Black 19 and Direct Black 22 for black printing and yellow. C, L Direct Ya-8 for printing
6 and C, L 7 Side Yellow 79 respectively.

When a magnetic toner was formed with the particle size of the magnetic body 1 being less than α01 μm and less than a2 μm and transfer printing was performed using a magnetic printer,
Light scattering; OHP (0ver Head
Projector > color projection display on a screen using transmitted light was successfully achieved. A magnetic toner was formed by setting the particle size of the magnetic material 1 to less than 2 μm from 0.2 μm, and printing was performed in the same manner.However, printed characters and patterns h′ with a translucent or opaque feel were obtained, but the colored layer 2 The colors of the dyes contained were faithfully reproduced and very good print quality was obtained. When a magnetic toner was formed with the particle size of the magnetic material 1 set to 25 μm from 2 μm or more and printing was performed in the same manner, the result was printing with less light scattering! f#: It became very dark, and the scattering in areas not required to be printed h'' - became very small, and stable printing quality was obtained.

Embodiment 2 FIG. 2 shows a sectional view of another embodiment of the present invention. The feature of this embodiment is that the coloring layer 2 is formed on the surface of the magnetic material 1, and the dye or pigment is transferred from the inside to the surface by the surface number of the fixed binder layer 3, and is allowed to penetrate and diffuse from the outside. It was formed. Magnetic material 1 was formed using the same method and the same particle size as in Example 1. As the binder material, the same material as in Example 1 was used, and it was melted and mixed with the m-type substance 1 and then sprayed in a mist form into a low-temperature atmosphere, or sprayed from hS without cluster generation in a vacuum, or as appropriate. The magnetic substance 1 was dissolved in a suitable solvent and mixed, and then vacuum freeze-dried to form a magnetic substance 10 with a thickness of 11 μm to 10 μm on the surface thereof. FIG. 3(c)) shows a cross section of the toner formed by the Queen's method and before coloring. FIG. 3) shows a sectional view of an example of the apparatus used for forming the colored N42, and the forming method will be described below.

Dye 5, whose surface has been treated with a suitable surfactant to improve fluidity, is placed in tank 4. Heater for tank 4, 6. A vibrator 7h was installed so that the dye in the mixing tank 4 could be heated and agitated. The heater consisted of six metal heating elements, a ceramic heating element, and an infrared lamp, and the vibrator consisted of seven piezoelectric vibrators and an electromagnet. Next, the toner before coloring as shown in FIG. is thermally diffused onto the surface of the binder layer 3 to form the colored layer 2. The heating temperature, imaging period, and width were adjusted depending on the melting point of the binder layer 3 and the compatibility between the material of the binder layer 3 and the dye 5. When the material of the tank 4 is glass or ceramics, infrared lamp heating is particularly effective and uniform heating is achieved. When an oscillating magnetic field was applied to the tank 4 using an electromagnet to vibrate the mixed magnetic toner, the separation between the toner particles became good and the formation of the colored layer 2 became faster.

The strength and frequency of the oscillating electric field were adjusted according to the average particle size of the magnetic material 1. When 7 was prepared separately after coloring and was adsorbed and separated using an electromagnet, the dye 5 and the colored magnetic toner were separated under very good pressure. It is possible to separate.

Embodiment 5 FIG. 4 is a partial sectional view of another embodiment of the present invention. A magnetic material 1 was formed into a plate shape, and a colored layer 2 was formed around it. The thickness of the magnetic body 1 was set to 10 μm from 0.003 μm, and the particle size of the magnetic body 1 and the thickness of the colored layer 2 were formed in the same manner as in Example 1. When the above-mentioned magnetic toner was transferred and printed using a magnetic printing machine, strong adhesion properties were obtained with less bulge tr of the printed and fixed toner.

Embodiment 4 FIG. 5 shows an embodiment of the present invention in which the colored layer 2 is partially formed on the magnetic material 1. By adjusting the adhesion amount of the colored layer 2, a magnetic toner capable of printing in delicate tones from low #y printing to high density printing was obtained. 1 is a cross-sectional view of one embodiment of the invention that may be implemented; FIG. The particle size of the magnetic material 1 is formed between 0.2 μm and 10 μm, and the binder layer 8 #
i A magnetic toner was formed using the same materials and thickness as in Example 1 and using the same method. When the uncolored toner of the present invention was used for transfer and printing with a magnetic printing device, it was possible to print extremely clear light or white colors on colored paper.

In addition, by changing the particle size of the magnetic material 1, it is possible to easily adjust the printing gloss and the sharpness of the white color.
[Effects of the Invention] As stated above, according to the present invention, it is possible not only to color the dyes and pigments in any desired color without substantially impairing the color tone, but also to change the shading and lightness of the coloring. The effect that transparency and opacity can be easily adjusted by adjusting the particle size of the magnetic material was obtained. The plate-like shape also has the effect of making the printing toner more durable after transfer printing. Furthermore, not only can you easily print white colors that are difficult to print with regular magnetic printing, but you can also easily adjust sharpness changes. Since magnetic toner before coloring can be produced under the same conditions, it also has the effect of simplifying the manufacturing process for multi-colored magnetic toner.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional view showing an embodiment of the color magnetic toner of the present invention. FIG. 2 is an explanatory diagram of another embodiment of the toner of the present invention. FIG. 5 is a block diagram of an apparatus for producing an embodiment of the toner of the present invention shown in FIG. 2. FIG. 4 and FIG. 6 are partial sectional views of other embodiments of the toner of the present invention. FIG. 5 shows another example of the toner of the present invention. 1... Magnetic material 2... Colored layer 3.8... Binder layer 4... Tank 5... Dye 6...・φ Heater 7... Vibrator or more Applicant Seiko Epson Corporation

Claims (1)

[Claims] For a magnetic printer, characterized in that a material colored darker than the magnetic powder or the magnetic microplates is adhered to the surface of a magnetic powder or magnetic micropieces having at least one kind of optical property among colorless, transparent, or light-colored. Magnetic color toner.