JPH0431470A - Image recording ink - Google Patents

Abstract

PURPOSE:To obtain an image recording ink which can stably form a high-quality image without being affected by the external humidity by adding particles containing organic cations and a liquid dispersing medium to an ink. CONSTITUTION:An image recording ink whose adhesiveness varies with the polarity of the applied voltage and which contains at least particles containing organic cations and a liquid dispersing medium. The particles containing organic cations are prepared by replacing the cations of a crystalline layered inorganic compound such as sodium montmorillonite, calcium montmorillonite, trioctahedral synthetic smectite, sodium hectorite, lithium hectorite, or a fluoromica such as sodium taeniolite, a synthetic mica or a hydrated silicate by organic cations. The particles containing organic cations are generally used in an amount of 7-50wt.% per 100wt.% of the ink.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink used in an image forming method using an ink whose adhesion changes with the application of a voltage.

[Conventional technology]

Traditionally, recording peripherals for computers and other devices include printers that use various recording methods, such as laser beam and
Printers, inkjet printers, thermal transfer printers, wire dot printers and daisy-foil printers are well known.

The present applicant has also previously proposed a recording method in which pattern-like adhesiveness is chemically imparted to ink and recording is performed by utilizing the difference between the adhesiveness and non-adhesiveness of this ink (Japanese Patent Laid-Open No. 63-3027
No. 9).

However, the above recording method is not suitable for large-volume printing due to cost and other considerations. Suitable for mass printing:
Conventionally, there are lithographic printing methods, letterpress printing methods, and gravure printing methods. In the conventional printing method, it is common to first apply ink to the surface of several rolls provided in succession, and then apply plate printing once the thickness of the ink has become sufficiently thin.

In view of the above-mentioned circumstances, the present applicant proposed a printing method (Japanese Patent Application No. 63-126
No. 17) was proposed.

[Problems that the invention attempts to solve]

The present invention further improves the ink used in the method of printing by changing the adhesion of the ink by applying a voltage. Problems include the fact that changes in the adhesion of the ink due to the applied voltage become difficult to occur, and the fine particles contained in the ink have poor dispersibility in the organic solvent that is the liquid dispersion medium, resulting in roughness of the ink and deterioration of image quality. The purpose is to solve the problem.

(Means and effects for solving the problem) The present inventors
As a result of intensive studies to achieve the above object, it was discovered that the problem listed in J- can be solved by modifying the fine particles contained in the ink and adjusting the behavior of the fine particles. It has come to this. That is, the present invention provides an image recording ink that adheres only to one electrode and does not adhere to the other electrode by applying a voltage from a pair of electrodes, in which fine particles containing organic cations and This is an image recording ink characterized by containing at least a liquid dispersion medium.

According to the present invention, the step of supplying ink whose adhesion changes depending on the polarity of the voltage applied between a pair of electrodes, applying a voltage between the pair of electrodes and causing the ink to adhere on either electrode. and a step of transferring the adhered ink to a recording medium, wherein the fine particles contained in the ink have low hygroscopicity and good dispersibility in an organic solvent as a liquid dispersion medium. Therefore, high-quality image formation can be stably obtained.

In the above process, if the particles are in the ink or are made only of inorganic substances that do not contain organic cations, their viscosity will decrease during the image forming process due to their high hygroscopicity, and they will stick even when voltage is applied. It is not possible to change the properties sufficiently, and even if images are formed under such conditions, there is a lot of fogging and only images of poor quality are obtained. Furthermore, since the ink has poor dispersibility in organic solvents, the ink becomes rough and only low-quality images can be obtained. The organic cations contained in the fine particles of the ink of the present invention can reduce the hygroscopicity of the fine particles and improve their dispersibility in organic solvents, making it possible to record high-quality images.

In order to facilitate understanding of the present invention, first, the principle of an image forming method to which the ink of the present invention can be applied will be explained with reference to the drawings. "1%" and "part" are based on weight unless otherwise specified.

FIG. 1 shows one embodiment of an apparatus for forming images using the ink of the present invention. In the figure, an ink carrying roll 1 is a member that has a cylindrical shape and rotates in the direction of the arrow. The roll 1 is made of a conductive material such as aluminum, copper, or stainless steel. The surface of the ink carrying roll 1 (
On the cylindrical surface), ink 2, which is a recording material, is formed to have a uniform thickness by a coating roll 9 rotating in the direction of arrow E. The ink roll 11 has a cylindrical shape, rotates in the direction of arrow F in the opposite direction to the coating roll 9, and takes ink into and out of the ink fountain 12. The roll 11 is made of a conductive material such as aluminum, copper, or stainless steel.

Further, electricity is supplied between the roll 9 and the roll 11 by the DC power supply 104. Further, the DC power supply 105 is connected to the ink carrying roll 1
A voltage can be applied between the roller and the coating roll 9.

The ink carrying roll 1 is connected to one end of a DC power supply 103. A plate 4 wound around a plate roll 3 is in contact with the ink 2 on the surface of the ink carrying roll 1. Plate roll 3
is rotating in the direction of arrow B in the opposite direction to roll 1. Edition 4
For example, as shown in FIG. 2, a desired pattern 4b made of an insulating material is provided on a base material 4a made of a conductive material such as metal.

The base material 4a may be made of aluminum, copper, stainless steel, platinum, gold, chromium, nickel, steel copper, carbon, or a conductive polymer or various polymers in which metal fillers are dispersed. Materials for pattern 4b include thermal transfer recording materials (mainly wax and resin),
Electrophotographic toners, vinyl-based polymers, and natural or synthetic polymers are used.

In this way, by applying a voltage between the plate 4 and the ink carrying roll 1 by the power supply 103, the adhesion of the ink 2 that comes into contact with the conductive portion of the plate 4 changes, and due to the difference in adhesion, the ink is applied to the plate 1. 2 is deposited in a pattern to form an ink image.

The voltage of the power supplies 103, 104, 105 is practically 3 to 1
A DC voltage of 00V, more preferably 5 to 80V is preferable, and by further applying an AC bias voltage of high frequency (101 (z to foOkHz)), the image quality can be sharpened.

The thickness of the ink layer 2 formed on the surface of the ink carrying roll 1 is determined by (the size of the gap between the ink carrying roll 1 and the coating roll 9, the fluidity or viscosity of the ink 2, and the thickness of the surface of the ink carrying roll 1). Although it varies depending on the material, surface roughness, rotational speed of the roll 1, etc.), the ink transfer position where the roll 1 faces the pattern 4 on the printing roll 3 is approximately 0.001 to 100 mm. preferable.

If the thickness of the ink layer 2 is less than 0.001 mm, it will be difficult to form a uniform ink layer on the ink carrying roll 1. On the other hand, if the ink layer P1 exceeds 100 mm, it will be difficult to convey the ink layer 2 while keeping the surface layer of the ink layer (the layer in contact with the conductive pattern plate roll 4) at a uniform circumferential speed. It is also difficult to energize the support roll 1 and the plate 4.

Next, the ink image on the plate 4 is transferred to the plan cylinder 5 which rotates in the direction of the arrow C while being in pressure contact with the plate 4, and further the ink image on the plan cylinder 5 is rotated in the direction of the arrow while being in pressure contact with the plan cylinder 5. The ink image is transferred to a recording medium 7 (paper, cloth, metal sheet 1, etc.) passing between the impression cylinders 6, and an image 8 corresponding to the ink image 1 is formed on the recording medium 70. .

In some cases, the ink image on the plate 4 may be directly transferred to the recording medium 7'' without providing the plan cylinder 5, but if the plan cylinder 5 is provided, the material of the plan cylinder 5 may cause abrasion and deterioration of the plate. In addition, an image (positive image) having the same pattern as the plate can be obtained on the recording medium.

In addition to the above-mentioned version 1, a plate having an insulating film on which an image-like conductive pattern is formed by discharge breakdown on a base material made of a conductive material can also be used. Furthermore, a plate having a photographic image in which a conductive pattern of a silver image is formed by depositing silver particles on a base material made of a conductive material can also be used.

In the example shown in Fig. 1, the plate 4 is used by being wound around a cylindrical plate roll 3, but the plate 4 is used as a Y plate and is made into 7Hi, and the plate is coated with ink and the counter electrode is placed between the plate and the plate. Even if a voltage is applied with the ink sandwiched between them, an ink image can be formed on the printing plate.

Image forming methods to which the ink of the present invention can be preferably applied include:
As explained above, the electrode (
This method takes advantage of the fact that the adhesion of the ink changes depending on the pattern of the electrodes by supplying a specific ink between the plate and the counter electrode and applying a voltage between the pair of electrodes. .

In the above, a preferred embodiment of the ink is one that has adhesive properties when no voltage is applied, and that adhesive properties disappear when a voltage is applied, so that the ink adheres to the insulated portion of the plate and the desired recording is achieved. This is what an image is formed on.

Next, voltage application adhesion control using the ink of the present invention will be explained.

The following reasons can be considered for the mechanism by which the ink changes from adhesive to non-adherent due to voltage application.

In other words, when electricity is applied by applying a voltage, the ink electrolyzes and generates gas, changing its adhesive properties. The ink generates gas near the electrode, and this gas prevents the ink from adhering to the electrode. In order for the ink to electrolyze and generate gas, an electrolyte is dissolved in a solvent such as alcohol or glycol in the ink. The lower the electrical resistance of the ink, the better, with a volume resistivity of 105Ω・c[! It is preferable to set it to 1 or more. If the volume resistance exceeds 10' Ω·cm, the amount of current flowing becomes low, or a high voltage is required to prevent the amount of current flowing from decreasing.

The ink of the present invention is suitable for printing in which the liquid dispersion medium contained generates gas upon application of voltage. In this embodiment, the hygroscopicity and l of the fine particles in the ink
J) This is because the influence of dispersibility is large. Furthermore, in the embodiment in which gas is generated, the ink is preferably used as described below.
Noku contains water.b.

In general, if the ink is a liquid such as alcohol, the cohesive force is weak and suitable tackiness cannot be obtained. This ink is applied, for example, to a platinum metal plate 1j:2 placed in the direction of the lead surface.
It is preferable that the ink be substantially retained on the platinum-plated stainless steel plate when the ink is deposited to a thickness of nim. In addition, the ink was sandwiched between two platinum-plated stainless steel plates to reduce the thickness of the ink to 2 mm.
(1) When the two platinum-plated stainless steel plates are separated from each other in a state where no voltage is applied, it is preferable that ink adheres to both plates to the same extent.

The ink that uses the navigation mechanism is based on the above-mentioned patent application filed in 1982.
As disclosed in No. 12617, etc., the basic V liquid can be composed of a dispersant and fine particles, but ink made of such materials absorbs moisture from the air in high humidity conditions. Since it causes a decrease in viscosity, it has a problem in terms of environmental stability. Therefore, in the present invention, the hygroscopicity is improved by using particles with low hygroscopicity, and the dispersibility in the liquid dispersion medium is also improved, thereby making it possible to record high-quality images. .

The organic cation-containing fine particles used as an essential component in the ink in the present invention include Na-montmorillonite, C
a-montmorillonite, 3-octahedral synthetic smectite,
Substitution of 41 cations of inorganic crystalline layered compounds such as fluorinated mica, synthetic mica, and hydrated silicate, such as Na-hectolite, Li-hectolite, trasilicic mica, and Li-teniolite, with organic cations. This can be obtained by

"C" is an organic cation used for organic substitution,
Specifically, benzyldimethylsudearylammonium,
Examples include dimethyloctadecyl ammonium, ethanolamine, triethanolamine, n-dodecylamine, benzoylcholine, laurylpyridinium, n-octadecylamine, stearyltrimedelammonium, cetylpyridinium, hexadecylpyridinium, benzethonium, benzalkonium, and the like. These usually exist in the form of salts with anions, and by replacing the inorganic cations existing between the crystal layers of the inorganic fine particles by a conventional method, an organic composite of the inorganic fine particles can be formed. That is, by adding an organic cation solution to an aqueous dispersion of smectite, drying and pulverizing the generated reaction product, organic cations can be introduced between the crystal layers of the fine particles, and as a result, in the resulting fine particle unit g. In general, about 0.2 to 3.6 ma+ol of organic cation can be contained.

The fine particles containing organic cations produced in this way are 7 to 50% by weight based on 100% by weight of the ink, and historically 12 to 40% by weight.
It is preferable to include i% of nails. Incidentally, the average particle diameter of the fine particles may be about 0.1 to 50 μm.

The ink of the present invention may further contain fine particles other than those mentioned above for the purpose of filling in order to adjust viscoelasticity. Such fine particles include silica, carbon, metal (
Zinc sulfide, Ag, Cu, etc.) particles, sulfide (zinc sulfide Z
nS, Tii. Antimony sulfide Sb2S3, potassium sulfide 2S, calcium sulfide CaS, germanium sulfide GeS, ffE cobalt oxide (:oS, tin sulfide SnS, iron sulfide FeS, copper sulfide Cu2S, manganese sulfide MnS, molybdenum sulfide MO2S3, etc.) particles-, Silicic acid (orthosilicic acid H.SiO4, metasilicic acid 1
1□Sin, meso-silicic acid 12si206, meso-disilicic acid H. Si30, , Mesotetrasilicic acid t16si40
++ etc.) particles-r, polyamide resin particles, polyamideimide resin particles, iron hydroxide particles, aluminum hydroxide particles, fluorinated mica particles, polyethylene particles, montmorillonite particles, fluorine resins, etc. can be used. It is also possible to use polymer particles containing various charge control agents used as toners for electrophotography.

As the above-mentioned fine particles, the average particle size is io.

Microparticles of 1 μm or less, preferably 0.1 μm to 20 μm, especially 10 μm or less, can be used, and such fine particles may be contained in the ink at 1 part by weight per 100 parts by weight of the ink.
It can be contained in an amount of 3 parts by weight or more, preferably 3 parts by weight to 0 parts by weight, and more preferably 5 parts by weight to 6 parts by weight.

Next, the liquid dispersion medium of the present invention contains an organic solvent, and examples of the organic solvent include methanol, ethanol,
Propatol, glycerin, alkylene oxide addition polymer of glycerin, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol (weight average molecular weight: approximately 100-1000), ethylene glycol monomethyl glycol ethyl, ethylene glycol monoethyl ether, ethylene glycol 1,000 butyl 51-thyl, methyl carbitol, ethyl carpito-
for acedeyl, butylcarbitol, ethylcarpitol, diethylcarpitol, triedyl 1/glycol monomedyl ether, triethylene glycol 1,000 ethyl ether, propylene glycol 1,000 methyl ether, trieta, nolamine, porumamide, dimethylformamide, cymedyl Sulfoxide, N-methyl-
2-pyrrolidone, i,3-medylimidazolidinone,
N-Methylacetamide, ethylene carbonate, acetamide, succinonitrile, dimethylsulfogyceto, sulfolane, furfuryl alcohol, N,N-dimethylformamide, 2-dioxyethanol, hexa, methylphosphoric triamide (hexane) 11 of the following: A mixed solvent of 2 and 10 parts can be used.

Further, the liquid dispersion medium preferably contains water in addition to the above-mentioned 41 organic solvents in order to improve the ionic conductivity of the ink and lower the electrical resistance, and preferably contains water in an amount of 4 parts by weight or more and 50 parts by weight or less based on 100 parts by weight of the organic solvent. , it is preferable that Gj is contained in an amount of 8 parts by weight or more and 1-138 parts by weight or less. If the water content is less than 4 parts by weight per 100 parts by weight of the organic solvent, the ionic conductivity of the ink will decrease and the adhesion will not change due to voltage application. Furthermore, if the water content is more than 50 parts by weight per 100 parts by weight of the organic solvent, the viscosity of the ink will increase due to drying, making it difficult to form a uniform ink layer.

The ink of the present invention is suitable for an embodiment in which the change in adhesion is caused by gas generation during electrolysis. In this embodiment, gas is generated at one electrode (especially the cathode) and the other electrode is (Particularly for the anode), it is preferable to select a solvent that suppresses or weakens the generation of gas, thereby increasing the change in ink adhesion.

Furthermore, as electrolytes, potassium iodide, sodium iodide, potassium thiocyanate, potassium bromide, thorium bromide, de].Laedyl ammonium oxalide, LiBF
, etc. may be included alone or in a mixture of two inserts. However, the electrolyte is not limited to the above, but may be an electrolyte that dissolves in a solvent and has the effect of lowering electrical resistance. , ionic surfactants, etc. can be widely used.

The electrolyte is preferably contained in a saturated dissolution amount of 0.0001 mol/l to the liquid dispersion medium. 0.0001mol/
If the amount is less than 1, the effect of the electrolyte will not be observed, and if the amount is more than 10 liters, the ink will become non-uniform, which is not preferable.

The ink may contain colorants such as carbon black and other dyes and pigments used in the general printing and recording fields, if necessary. When the ink contains a colorant, the content of the colorant is preferably 0.1 to 40 parts by weight, preferably 1 to 20 parts by weight, and 11 parts by weight per 100 parts by weight of the ink. In addition, instead of a coloring agent or together with a coloring agent,
Contains a color-forming substance that develops color when voltage is applied, and is resistant to 4J.

In addition, electrolytes that give conductivity to ink, thickeners,
It is also possible for the above-mentioned fine particles themselves to also function as a coloring agent, which can contain a thinning agent, a surfactant, etc.

In the present invention, more preferably, in order to control the viscosity of the ink, 1 to 90 parts by weight of the above-mentioned polymer soluble in the liquid dispersion medium is added to 100 parts by weight of the ink material.
Furthermore, it can be contained in a proportion of 1 to 50 parts by weight, particularly 1 to 20 parts by weight. Examples of such polymers include plant-based poly7-polymers such as guar gum, locust pea gum, gum arabic, taragant, carrageenan, pectin, mannan, and starch; microbial polymers such as xanthan gum, dextrin, succinoglucan, and curdlan; and gelatin. , animal polymers such as casein, albumin, and collagen; cellulose polymers such as methyl cellulose, ethyl cellulose, and hydroxyl cellulose; starch polymers such as soluble starch, carboxymethyl starch, and methyl starch; propylene glycol alginate, alginates, etc. Semi-synthetic polymers such as alginic acid polymers and other polysaccharide derivatives: Vinyl polymers such as polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methyl ether, carboxyvinyl polymers, sodium polyacrylate, etc.Other polyethylene glycol, ethylene oxide, propylene oxide Synthetic polymers such as block copolymers, alkyd resins, phenol resins, epoxy resins, amino alkyd resins, polyester resins, polyurethane resins, acrylic resins, polyamide resins, polyamideimide resins, polyesterimide resins, silicone resins, etc. alone or in combination Can be used in combination.

It is also possible to use greases such as silicone grease and liquid polymers such as bolybdenum.

The ink described above can be obtained, for example, by mixing and preparing the above-mentioned liquid dispersion medium, fine particles, etc. in a conventional manner.

〔Example〕

Hereinafter, the present invention will be explained according to examples.

Example!・Glycerin-alkylene oxide 30 parts by weight side addition polymer (manufactured by Asahi Denka Kogyo Co., Ltd., trade name: ADEKA CARBOL TE-100) ・Water
7.5 parts by weight cyan pigment
5.6 parts by weight lithium borofluoride
4 parts by weight Colloidal hydrated silicate-1
By kneading a mixture of 2 parts by weight of benzyldimethylstearylammonium complex with the following formulation in a roll mill,
A blue amorphous solid ink was prepared. Here, the colloidal hydrous silicate-benzyldimethylstearylammonium complex was obtained by a substitution reaction of interlayer ions, and the complex contains about +2m+nol/g of benzyldimethylstearylammonium. It is something.

After applying the above ink to a thickness of about 2111 m on a platinum-plated stainless steel plate with an i crnX of 1 cm, a platinum-plated stainless steel plate of the same size as the surface was placed on the dry ink layer, and then the plate was coated under no voltage. When the two platinum-plated stainless steel plates were separated by gradually widening the distance between them, ink was found to have adhered to almost the entire area on both platinum-plated plates.

Next, a voltage of +30V was applied to both platinum-plated stainless steel plates with a 2+ nm thick ink layer sandwiched between them, one of which was used as an anode (earth) and the other as an anode. When the two platinum methukistine 1-nos plates were separated by gradually widening the interval between the metal plated stainless steel plates, all of the ink adhered to the anode side electrode, and no ink adhered to the cathode side.

Next, image formation was performed using the printing machine shown in FIG.

As the ink carrying roll, a platinum-plated stainless steel cylindrical roll (surface roughness IS) was used, and as the plate roll 3, a diameter 30 mm roll with a hard chrome-plated surface was used.
An mn+ iron cylindrical roll was used. A plate 4 made of an aluminum plate patterned with a vinyl resin was rolled onto the plate roll 3, and the above-described ink material was placed between the ink carrying roll 1 and the coating roll 9. The ink carrying roll 1 was rotated in the direction of the arrow at a circumferential speed of 5 mm/sec, and the gap between the coating roll 9 and the coating roll 9, which was a cylindrical roll made of surface Teflon rubber and rotating in the direction of the arrow E, was controlled. By rotating at mm/sec, the ink layer thickness of the ink carrying roll 10 was controlled to 0.2n+m. The plate roll 3 was rotated in the direction of arrow C at a circumferential speed of 501 IIl/scC.

When we printed with no voltage applied from the DC power supply 103 of this printing machine, we could not obtain an image-like printed matter, but when we printed with a DC voltage of 30V applied from the DC power supply 103, Due to the good dispersibility of fine particles in the ink, many prints with sharp image quality and no fog were obtained (at this time, the plate roll 3 was used as a cathode,
The ink carrying roll 1 was used as an anode).

In addition, this printing machine was heated at 25°C and 90°C with ink loaded.
After being left in a 5% high humidity environment for 4 hours, a print with the same sharp image quality as the original was obtained, which may be due to similar printing or to the low hygroscopicity of the fine particles in the ink.

Example 2 In Example 1, the colloidal hydrated silicate-stearyltrimethylammonium complex was replaced with the colloidal hydrated silicate-stearyltrimethylammonium complex.
1. Printing was carried out in the same manner as in Example 1 except that 0 mmol/g) was used, and the same effect was obtained.

Example 3 In Example 1, the colloidal hydrated silicate-hexadecylpyridinium complex was replaced with the colloidal hydrated silicate-hexadecylpyridinium complex.
Printing was carried out in the same manner as in Example 1 except that g) was used, and the same effects were obtained.

Comparative Example 1 (Ink formulation) - Glycerin ... 00 parts (equilibrium water content 55-60% at temperature 25 ° C. and humidity 70%) - Lithium fluoroborate ... 10 parts - Pigment (manufactured by Bayer) , product name 5upranolCya
nine 7BF) ”-40 parts, Hexaglycerin polylysylte...10 parts (manufactured by Nikko Chemicals, trade name tlexaglyn PR-15), Colloidal hydrated silicate...51 parts (Kunimine Kogyo Co., Ltd.) A blue amorphous solid colloidal sol ink was prepared by kneading the mixture of the above formulation in a roll mill.This ink was printed in a high humidity environment using the same equipment and method as in Example 1. As a result, after 10 minutes had elapsed after the ink was added, sagging increased and only prints with poor image quality were obtained, which was unsuitable.

Comparative Example 2 (Ink formulation) Ethylene glycol 90 parts (temperature 25°C, equilibrium water content 55-60% at 4 degrees 70%) Lithium fluoroborate 10 parts, Pigment (manufactured by Bayer, trade name 5upranolCya)
nine 78F) ---------1
0 parts Hexaglycerin bolyricylate...10 parts (manufactured by FJ Hikari Chemicals Co., Ltd., trade name Hexagly! IPR-15) Colloidal hydrous silicate...51 parts (Kunimine T Gyosha Co., Ltd.) A blue amorphous INN cocolloid sol ink was prepared by kneading the mixture of the above formulation using a roll mill. Printing was performed using this ink in a high humidity environment using the same apparatus and method as in Example 1. As a result, 1o after adding ink
After several minutes had elapsed, the blurring increased, and only one print of poor image quality was obtained, which was unsuitable.

〔Effect of the invention〕

The image recording ink of the present invention has low hygroscopicity and excellent dispersibility, so in the image forming process using cloth, it is stable and has high image quality regardless of external humidity. images can be formed. Therefore, by using the ink of the present invention, it becomes possible to extremely effectively perform image recording, which is effective as a recording peripheral device connected to various devices such as a combi coater.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an example of an apparatus for forming an image using the ink of the present invention, and FIG. 2 is a schematic side view showing an example of a plate that can be used in the image forming apparatus using the ink of the present invention. FIG. 1 Ink carrying roll 2 Ink 3 Plate roll 4 Plate 4a Non-conductive portion 4b Conductive pattern 5 ...Plan cylinder 6 ... Impression cylinder 7 ... Recorded object 8 ... Ink image 9 --- Coating roll 0 ...・Ink reservoir 1 Ink roll 2 Ink fountain 3 Power source 4 Power source 5 Power source Patent applicant Canon Co., Ltd. Company agent Patent attorney Tadashi Wakagata Figure 1

Claims (1)

[Scope of Claims] 1. An image recording ink whose adhesion changes depending on the polarity of an applied voltage, characterized in that it contains at least fine particles containing an organic cation and a liquid dispersion medium. ink. 2. The image recording ink according to claim 1, wherein the liquid dispersion medium generates gas upon application of a voltage. 3. The image recording ink according to claim 1, wherein the liquid dispersion medium contains water.