JPS6023051A - Color printing apparatus - Google Patents

Abstract

PURPOSE:To provide the titled apparatus easy in maintenance and control with good image quality, constituted so as to obtain color display through the transfer of a color display original after fabricating said original by forming a color layer onto a plurality of electrodes on a substrate from an electrodepositing polymer solution having a hardly water-soluble pigment dispersed therein by electrodeposition. CONSTITUTION:In a color printing apparatus, a plurality of fine dot matrix shaped electrodes 2 insulated to each other are fabricated on an insulating substrate 1 and electrode terminals 3 are provided so as to be taken out to the back side of the substrate 1. This electrode substrate 6 is immersed in an electrodepositing polymer solution 4 in which a pigment or dye hardly boluble or insoluble in water is dispersed and the electrode terminals 3 are connected to a power source 8 to apply a voltage pulse and a color layer 9 is selectively formed on the electrodes 7 by electrodeposition. Hereinafter, similar manipulation is performed by using a polymer electrodeposition solution having a pigment or dye having a different color dispersed therein and different color layers 12 are formed to fabricate a color display original and, thereafter, this original is transferred to recording paper to obtain color display.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color printing device, and more particularly to a printing device that prints with a colored polymer layer formed by electrodeposition.

[Prior art]

Currently, as color printing apparatuses, transfer type thermal recording systems, inkjet systems, and the like are known.

The former has several colors, such as yellow (Y), magenta (
A shicolor display is obtained by transferring an ink film coated with heat-melting ink of M) and cyan (C) onto recording paper using the heat of a thermal head. In this case, the ink film for each color requires the same area as the display screen, and can only be used for one printing, resulting in a lot of waste. The latter ejects ink from the nozzle toward the recording paper, so unnecessary ink that is not being recorded is not ejected, but maintenance and management of the device is required to prevent clogging of the nozzle and air bubbles generated in the ink. It is very difficult to completely control the flight state of the ink particles.

[Purpose of the invention]

Therefore, in order to eliminate the above-mentioned drawbacks, the present invention has the following features:
Electron 4: A colored layer is formed by electrodeposition from an electrodepositable polymer solution in which pigments or dyes which are soluble or insoluble in water are dispersed on the surface of the paper, and then transferred to recording paper to display color. The purpose of this invention is to create a color printing device that does not waste printing materials, is easy to maintain, and is easy to manage, and has good image quality.

[Structure of the invention]

Hereinafter, a method for forming a colored layer by electrodeposition of a polymer, which is an important point of the present invention, will be described. One method for electrodepositing a polymer on an electrode is to chemically polymerize a monomer on the electrode. As an example of this method, there is a report that a polymer film was obtained by electrochemically polymerizing a vinyl compound on an iron plate (Metal Surface Technology Vol. 1.19).
．． Ai2, 196B). Recently, there has been a lot of research into electrochemically polymerizing virol, thiophene, etc. to create conductive polymers such as polypyrrole and polythenylene on electrodes. However, such a method of directly electrochemically polymerizing monomers is not suitable for use in the present invention because the efficiency is still low, the obtained film is already colored, and the coloring is not arbitrary. has problems.

Another method for electrodepositing a polymer on an electrode is to make the polymer insolubilized and deposited on the stain from a polymer solution. As an example of this, a method called electrocoating is known industrially, in which a pigment is dispersed in an aqueous polymer solution, a metal rod is immersed in it, and a colored layer is electrodeposited on the metal. It is used for pre-coating, etc. The principle of this method is to introduce a hydrophilic group, such as a carboxyl group, into a polymer, and then neutralize the carboxyl group with an inorganic alkali, organic amine, etc. to make it water-soluble. Then, the electrode is immersed in an aqueous solution of the water-soluble polymer,
When a voltage is applied, carboxyl anions dissociated in the aqueous solution electrophores toward the anode and react with protons generated by electrolysis of water on the electrode, thereby insolubilizing and precipitating the polymer. , on the anode, the reaction shown in the following formula occurs, and the polymer precipitation becomes l, CJ.
Using a salt group (e.g. polyamine) as a hydrophilic group,
If it is neutralized and water-solubilized with an acid, the polymer will precipitate out in the dark.

It is thought that if the adhered polymer is extremely vertical, the current decreases as the electrode becomes coated with the polymer, preventing it from covering more than the ribs, so no increase in film thickness can be expected, but in reality Due to the bubbles of oxygen generated by the electrolysis of water, complete coverage at the initial stage is avoided, and a certain degree of film thickness≠1 柘 is required before the film becomes completely covered. Usually, Vil 0 with electrodeposited welding
A film thickness of 10 to 20 μm was obtained by applying a voltage of 0 to 200 V.

Polymers for anionic electrodeposition include adducts of natural drying oil tomaleic acid, alkyd resins with carboxyl groups introduced, adducts of epoxy tffiIIF+ with maleic acid, polybutadiene resins with carboxyl groups, acrylic acid or methacrylic acid. Copolymers of acids and their esters are used, and depending on the characteristics of the electrodeposited film, other polymers or organic compounds having functional groups may be introduced into the polymer skeleton. In addition, the amount of hydrophilic functional groups such as carboxyl groups and hydroxyl groups in the polymer is important; if there are too many hydrophilic groups, the electrodeposition layer will not be sufficiently insolubilized, resulting in an uneven film and If too much, the water solubility during neutralization will be insufficient. Water is the main component of the polymer solvent, and examples include isopropanol, n-butyl alcohol, t-butyl alcohol, methyl cellosol, and edyl cellosol.

Hydrophilic solvents such as isopropyl cellosolve, butyl cellosolve, diethylene glycol methyl ether, diethylene glycol ethyl ether, and diacetone alcohol are included as solvents for polymerization of polymers. The type and amount of the hydrophilic solvent to be used depends on the film thickness and uniformity of the electrodeposited layer (
Affect.

The coloring method used in the present invention is to electrodeposit a pigment or dye together with a polymer. In order to electrodeposit pigments and dyes together with polymers, it is necessary for pigment particles and dye molecules to be charged and electrophoresed. Pigments and dyes that are soluble or insoluble in water usually aggregate in water, or electrodeposited polymers can be regarded as a soap with hydrophobic and hydrophilic groups. It has a certain degree of dispersion effect on particles and molecules, and can be made into fine particles by mixing with a suitable dispersion medium, and can be electrodeposited together with polymers.

In this case, it is necessary to make the electrodeposition speed of the pigment and dye and the polymer comparable, but it is possible to control this by controlling the solution composition.

〔Example〕

Hereinafter, the present invention will be explained in detail based on Examples.

1) ■ Electrode Preparation As shown in Figure 1, AL, C! r. A fine dotted electrode 1 made of stainless steel or the like;
The electrode terminal 3 is taken out to the back side of the substrate (7).In addition to the structure described above, a TPT (thin conductive transistor) or the like may be used as the structure of the electrode.

■The electrodeposition polymer electrodeposition paint has the following composition (Nisbia E
Using Nisbia ED-3000 (manufactured by Shinto Paint Co., Ltd.), an electrodeposition bath having the following composition was prepared.

The oil-soluble dyes to be used are limited to those soluble in hydrophilic solvents, and preferably those having a metal complex salt structure have excellent light resistance.

For example, some molecules have the following molecular structure: (The product name is Aizen 5pilon.

0'1eosO1Fast etc.) H3 Color index number so:tVent Red 8
The bath preparation procedure is to dissolve Nisbia El-3000 in water. The dye is then dissolved in methyl cellosolve. At this time, the dye weight ratio X is arbitrarily selected within a range that does not exceed the solubility of the dye in methyl cellosolve. Methyl cellosolve in which the dye has been dissolved is added to the aqueous solution to uniformly disperse the dye. At this time, methyl cellosolve acts as a dispersion medium, but if the amount of addition is increased or the number of carbon atoms in the alkyl group of cellosolve increases, the thickness of the ribs increases and P becomes non-uniform.

Electrodeposition liquid 4 (see Figure 2 (a)) in which the yellow (Y) dye prepared as described above was dispersed was placed in a stainless steel container 5.
and immerse the electrode substrate 6 in it. The electrode 7 on the display screen that you want to color yellow is used as an anode, and the stainless steel container 5 containing the electrodepositing solution is used as a cathode and connected to a power source, and when several hundreds of voltage pulses are applied between the two electrodes, the voltage A yellow colored layer 9 is formed on the applied electric current 7. Next, as shown in FIG. 2(b), the electrode substrate 6 is immersed in an electrodeposition solution 10 in which magenta α dye is dispersed, and the electrode 11 to be colored magenta on the display screen is used as an anode made of stainless steel. When several hundreds of voltage pulses are applied between the cathode of the container 5 and the electrode 11 to which the voltage was applied,
Magenta coloring M12 is formed on top. Thereafter, by repeating the same operation in an electrodeposition solution in which dyes of different colors are dispersed, an original color display image is produced on the electrode.

Transfer When a recording paper is placed on the original color display image prepared on the electrode substrate 6 as described above and pressed, the colored layer is transferred onto the recording paper.

Through the steps described above, it was possible to print a color display on the recording paper.

:1) In Example 1), a porous polymer membrane such as a cellophane membrane or a PVA (vinyl alcohol) membrane is pressure-bonded on the electrode substrate 6, and thereafter, the same operation as in Example 1) is carried out. By repeating this process, an original color display image can be produced on the porous polymer membrane. By transferring this original image onto recording paper, it was possible to print a color display. In this example, a colored layer is formed on the electrode by a polygonal layer of T1. Since the porous polymer film was formed on the polymer Ilα, the electrodes were not contaminated, and color printing with good image quality could always be achieved by alternating and discharging this porous polymer film.

10) The electrodeposition liquid in which the dye in Example 1) was dispersed was adsorbed on an alumite layer prepared by anodizing A113 in an aqueous nitric acid solution, as shown in FIG. The layer 14 is brought into close contact with the porous polymer membrane 15 pressed onto the electrode 2, and the same steps as in Example 1) are then repeated to produce an original color display image on the porous polymer membrane 15. be able to. By transferring this original image onto recording paper, it was possible to print a color display. In this example, by electrodepositing and adsorbing the liquid onto the porous alumite layer, handling of the Lightning 1 liquid became extremely easy, and a color printing device that was easy to maintain and manage was obtained.

〔Effect of the invention〕

As described above in detail in Example 1) and I+), the color printing device according to the present invention forms a colored layer on an electrode by electrodeposition, and then transfers it to a recording paper to display a color display. Gain less waste and maintenance of printing materials.

It has the advantages of easy management and excellent image quality, and is extremely effective in obtaining color displays.

[Brief explanation of the drawing]

FIG. 1 shows the structure of the electrode in the present invention. FIG. 2 shows the electrodeposition process in the present invention. Figure 3 shows the electrodeposition process in the present invention when the electrodeposition liquid is held in the alumite layer. 1... Separate substrate 2... Dottomad 11 box-shaped thunder electrode 3... VJ7 electrode terminal 4... Electrodeposition liquid in which yellow (total) dye is dispersed 5...
・Stainless steel container 6...Electrode substrate 7...Colored with yellow (2) 'F: Pole 8...Power supply 9...Yellow (Y) colored layer 10...Magenta (material) ) dye dispersed in the electrodeposition solution 1
1... Electrode to be colored with magenta (b) 12... Colored layer of magenta (goods) 1! 1... 8! 14... Alumite layer holding electrodeposition liquid 15... Porous polymer membrane Figure 1

Claims (1)

[Claims] (11) In a color printing device, a colored layer is formed from an electrodepositable polymer solution in which a pigment or dye that is sparingly soluble or insoluble in water is dispersed on a plurality of electrodes arranged on a substrate insulated from each other. By selectively forming the color by electrodeposition, and then performing the same operation using a polymeric electrodeposition solution in which pigments or dyes of different colors are dispersed, an original image for color display is created, and this original image is then recorded. A color printing device characterized by obtaining a color display by transferring it to paper.
2. The color printing apparatus according to claim 1, wherein an original image for a color display is formed on the film by electrodeposition, and then the original image is transferred to recording paper to obtain a color display.