JP2003330179A - Photosensitive recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photosensitive recording material which can be written with light, has excellent coloring property, is free of ground coloring, has high resolution, and ensures low energy consumption. <P>SOLUTION: The photosensitive recording material comprises microcapsules containing at least colored particles of two or more materials different from each other in color tone, wherein colored particles of at least one of the materials are charged particles, and a dispersion medium which is thickened or cured by light. Colored particles of at least one of the materials are preferably white particles and the dispersion medium preferably includes a polymerizable compound. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive recording material, a photosensitive recording medium and a recording method using the same, and more particularly to a recording material having a small recording energy, a photosensitive recording medium and a recording method using the same.

[0002]

2. Description of the Related Art Conventionally, methods such as silver salt photography, heat-sensitive recording (heat melting type and sublimation type), electrophotography and ink jet are known as methods for forming a full-color image. Although silver salt photography and thermal recording methods have high image quality, they have the drawback of generating waste such as developer and ink ribbon. Toner is required for the electrophotographic method and ink is required for the inkjet method. Therefore, a self-coloring type recording medium has been studied from the viewpoint of eliminating waste. One is called a light and pressure sensitive method, in which exposed portions cause the cured microcapsules to be cured and non-cured, and thereafter, the microcapsules which are not cured by pressurization are destroyed to give colored encapsulation. An image is obtained by transferring an object to paper or by reacting an encapsulated material that is a dye precursor with a developer (coupler) prepared outside the microcapsules to develop a color. For details, see “Electronic Society of Japan 1992 First Research Meeting Proceedings,” p. 47 (19
92).

In addition, a heat-sensitive TA paper (Fuji Photo Film) has been developed. This is a thermoresponsive capsule containing a dye precursor, a diazonium salt, which is controlled by heat to bring the encapsulated material into contact with a developer (coupler) prepared outside the capsule, an organic base compound, that is, By controlling the reaction, the formation of the dye is controlled. Next, the dye precursor is decomposed by irradiating with ultraviolet rays, and the reaction with the coupler makes it impossible to develop a color, thereby fixing the dye. Ingenuity was applied to the thermo-responsive capsule and diazonium salt to obtain full color. About this, "Printer Materials and Chemicals"
(Kyosuke Takahashi, Masahiro Irie, CMC (199
5)). In addition, JP-A-2000-
218944 and Japanese Patent Laid-Open No. 2000-221692 have devised a light and heat sensitive system and a light sensitive system using a double capsule.

The above-mentioned light and pressure sensitive method has a drawback that it is necessary to break the capsule by pressurization, so that the particle size of the capsule cannot be reduced, and the breakage deteriorates the resolution and the image quality becomes coarse. there were. In addition, T of thermal method
A paper has at least Y, M, and
The three heat-sensitive layers of C and ultraviolet rays having different wavelengths are required for fixing, and since writing is performed by a thermal head and fixing is performed by ultraviolet rays, there is a drawback that recording energy increases. Further, in these conventional self-coloring type recording media, since the chemical reaction of the color forming material is used in the developing step, there is a problem of background color formation and a problem that color formation control for obtaining a desired color is difficult. was there.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks of the prior art, the present invention is a recording material which is writable by light, has excellent coloring properties and does not cause background coloring, and has high resolution. An object is to provide a light-sensitive recording material with low energy consumption.

[0006]

At least one of a plurality of colored particles colored in a predetermined color is an electrophoretic particle, and a dispersion medium which is thickened or hardened by light is enclosed. This has been achieved by using a photosensitive recording material characterized by containing microcapsules and utilizing development based on the physical manipulation of electrophoretic particle movement by voltage.

The first photosensitive recording material of the present invention contains at least two or more kinds of colored particles having different color tones, at least one of which is a charged particle and which is thickened or cured by light. A photosensitive recording material including microcapsules containing a dispersion medium.

At least one of the colored particles is preferably a white particle.

The second photosensitive recording material of the present invention is the photosensitive recording material of the first photosensitive recording material, wherein the dispersion medium contains a polymerizable compound.

The polymerizable compound is preferably an acrylic compound.

A third photosensitive recording material of the present invention is the same as the first or second photosensitive recording material, further comprising a photopolymerization initiator,
Alternatively, it is a photosensitive recording material containing a photopolymerization initiator and a wavelength sensitizer.

The fourth photosensitive recording material of the present invention comprises first, second
Alternatively, the photosensitive recording material of No. 3 contains a visible light polymerization initiator having a maximum absorption spectrum in the wavelength range of 400 nm to 800 nm or a wavelength sensitizer.

The fifth photosensitive recording material of the present invention comprises:
In the photosensitive recording material of 2, 3 or 4, at least,
Cyan, magenta, yellow three primary colors, or red,
A photosensitive recording material comprising at least three types of microcapsules containing colored particles having any of the three primary colors of green and blue and particles having a color different from the colored particles.

A sixth light-sensitive recording material of the present invention is the light-sensitive recording material of the fifth light-sensitive recording material, further including microcapsules containing colored particles having a black color.

A seventh photosensitive recording material of the present invention is the same as the fifth or sixth photosensitive recording material, wherein each of the at least three types of microcapsules has a photopolymerization initiator having an absorption spectrum maximum at a different wavelength, Alternatively, it is a photosensitive recording material containing a photopolymerization initiator and a wavelength sensitizer having an absorption spectrum maximum at a different wavelength.

The first photosensitive recording medium of the present invention is a first photosensitive recording medium,
It is a photosensitive recording medium obtained by coating a support with 2, 3, 4, 5, 6 or 7 of a photosensitive recording material.

The first recording method of the present invention is the first, second,
It is a recording method including a step of irradiating the photosensitive recording material of Nos. 3, 4, 5, 6, 7 or the first photosensitive recording medium with light and a step of applying an electric field.

It is preferable that the method further includes the step of applying an electric field in a direction opposite to the direction of the electric field.

A second recording method of the present invention is the recording method according to the first recording method, wherein the irradiation light is light having three or more different wavelengths.

Further, it is preferable to include a step of irradiating with light.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below.

The recording material of the present invention comprises a plurality of colored particles 2a and 2b colored in a predetermined color, for example, as shown in FIG. 1, of which at least one kind of colored particles is charged. That is, it is composed of microcapsules 1 containing colored particles that are electrophoretic particles and a dispersion medium 3 (for example, a low-viscosity polymerizable compound) that thickens or cures by light. In addition, the code | symbol 4 has shown the microcapsule wall. All of the colored particles 2a and 2b may be electrophoretic particles, or may include particles of a type that does not electrophorese. Furthermore, the case where the microcapsules 1 and the recording material containing the microcapsules 1 appear white due to the suspension of white particles that do not electrophorese in the solvent, and the electrophoretic particles are colored in a color other than white. If necessary, a photopolymerization initiator, a wavelength sensitizer, a charge control agent, a dispersant, a lubricant, a stabilizer, etc. are added to the dispersion medium.

The electrophoretic particles are charged particles, and when an electric field is applied, that is, when a voltage is applied,
These particles move according to the direction of the electric field.

The particle size of the microcapsules is controlled by adjusting the size of the dispersion emulsion when emulsifying the liquid in which the electrophoretic particles are dispersed during the production of the microcapsules. The size of the dispersion emulsion is adjusted to a desired size depending on the stirring speed, the viscosity of the dispersion, or the type and amount of the emulsifier and the surfactant. Further, the distribution range of the particle size may be adjusted by performing a classification operation such as decantation, centrifugation, electrostatic separation or using a sieve. The recording medium of the present invention can be produced by applying the microcapsules thus obtained, together with a binder resin, if necessary, on a support such as paper, glass, or film, and providing a protective layer or the like. .

The basic operation of the recording material thus constructed will be described below. Here, the action of the microcapsules is the negatively charged white electrophoretic particles 2a and the positively charged black electrophoretic particles 2b.
An electrophoretic microcapsule composed of and will be described as an example.

Here, the microcapsules shown in FIG. 2A are in a state where no electric field is applied yet, and the electrophoretic particles 2 are ideally present in a uniform state dispersed in the microcapsules. Here, the upper side is the direction of the observation surface of the color of the microcapsules.

When a voltage is applied, an electric field having a direction depending on the polarity of the applied voltage is generated. Here, the direction of the electric field is indicated by E. In the microcapsules placed in this electric field, a downward electric field is generated, and the negatively charged white electrophoretic particles 2a are in the direction of the anode, and the positively charged black electrophoretic particles 2b are in the direction of the cathode. To be attached to the inner wall surface of the capsule wall 4. Figure 2
(B) shows a state where the electrophoretic particles 2a and 2b are attracted to each other and attached to the inner wall surface of the capsule wall 4 of the microcapsule. Therefore, when the capsule is viewed from the observation direction (from above), only the white color of the electrophoretic particles attracted to the capsule wall in the observation direction is observed.

The portion to be recorded can be selected by irradiating the recording medium with light in advance to increase the viscosity of the dispersion medium or by curing a part or all of the dispersion medium. Then, by applying a voltage and applying an electric field, the electrophoretic particles in the portion not irradiated with light are driven to form an image. Even if the voltage application is stopped in this state, the state of FIG. 2B is maintained for a while due to the viscosity and the holding force of the liquid dispersion medium. Then, by exposing the entire surface, the viscosity of the dispersion medium is increased, or by curing the dispersion medium, the image can be fixed and fixed.

Further, a voltage is applied in advance, and the colored particles are moved within the capsule according to the direction of the electric field. Next, the portion to be recorded is selected by increasing the viscosity of the dispersion medium by light irradiation or by curing a part or all of the dispersion medium. Then, an electric field in the opposite direction to the electric field previously applied is applied to
The colored particles that had gathered on the capsule surface were moved in the direction opposite to the observation surface, and at the same time, the colored particles with different color tones that had been moved in the opposite direction to the observation surface in the previous voltage application step were used as the capsule surface on the observation surface side. Move to. Then, the image can be fixed by exposing the entire surface to increase the viscosity of the dispersion medium, or by curing a part or all of the dispersion medium.

FIG. 3 shows an example of a combination in the electrophoretic microcapsule color-developing body in a state after voltage application. In the figure,
2a indicates white pigment particles, 2b, 2c, 2C, 2M, 2Y and 2W indicate colored pigment particles (including white particles), and 2d indicates white fine particles.

FIG. 3A shows a combination of white pigment particles 2a and colored pigment particles 2b, and 2a and 2b are electrophoretic particles that are positively or negatively charged. After applying the voltage, each particle moves according to the charge polarity.

FIG. 3B shows a combination of colored pigment particles 2c and white fine particles 2d in a dispersed state, 2c is electrophoretic particles, and 2d is not electrophoretic particles. After the voltage application, the electrophoretic particles 2c move according to the charge polarity.

FIG. 3C shows colored pigment particles 2C, 2M, 2
A combination of Y and 2W, 2C, 2M, 2Y and 2W are electrophoretic particles having different charge amounts or charge polarities. By including electrophoretic particles having different charge amounts or different charge polarities in the microcapsules, one microcapsule can express a plurality of colors. This allows
High resolution can be expected.

In the present embodiment, in order to realize color expression, a plurality of microcapsules configured as described above having different expression colors are used. For example, one color particle is a white particle, and three or more kinds containing yellow, magenta, and cyan (or red, green, and blue) color particles, respectively, and, if necessary, black color electrophoresis. Four or more types of microcapsules containing particles can be used.

For each microcapsule, it is preferable to use a dispersion medium that thickens or hardens by different light. For example, as such a dispersion medium, a photopolymerization initiator having a different absorption wavelength region, that is, having a maximum value of an absorption spectrum at a different wavelength, or a polymerizable compound to which a combination of a photopolymerization initiator and a wavelength sensitizer is added Can be used. The colored particles may have a dye sensitizing effect. Further, as the wavelength sensitizer, a decolorizable dye that disappears when exposed to light may be used so as not to impair the color of the dispersion medium colored by the dye. A color recording medium can be prepared by mixing a plurality of these capsules and coating them on a support (FIGS. 4 and 5) or by laminating each color separately (FIG. 6). A protective layer 6 may be provided on the recording medium as shown in FIG.

The recording principle using the recording medium of the present invention will be described with reference to FIG. 7 by taking a recording medium using microcapsules for yellow, magenta and cyan as an example. In FIG. 7, white particles 2d in a dispersed state and not electrophoresed, yellow electrophoretic particles 2Y, magenta electrophoretic particles 2M, and cyan electrophoretic particles 2 are shown.
C is used, which is composed of white fine particles 2d and 2Y and a light yellow dispersion medium that is sensitive to blue light, and is composed of yellow microcapsules 1Y, white fine particles 2d and 2C, and a light blue dispersion medium that is sensitive to red light. A magenta color microcapsule 1M including a cyan color microcapsule 1C, white fine particles 2d and 2M, and a light reddish purple dispersion medium that is sensitive to green light is used. The color of the dispersion medium itself is transparent, but since a decolorizable dye that disappears when exposed to light is used as a wavelength sensitizer, the dispersion medium is light yellow, blue, and magenta before irradiation with light. Therefore, in the microcapsule, a mixed color of the white color of the fine particles 2d and the color of the dispersion medium can be observed. Also, after light irradiation. The wavelength sensitizer in the dispersion medium is decolored, and the microcapsules appear white as a whole due to the dispersion of non-electrophoretic white fine particles.

FIG. 7A shows an embodiment of the recording medium of the present invention, and FIG. 7B shows the color arrangement when the recording medium is viewed from above. Here, the fine particles 2d are used. A mixed color of white and the color of the dispersion medium can be observed.

First, when the recording medium of the present invention is irradiated with visible light of three different wavelengths having image signals, for example, 7R (red light), 7G (green light) and 7B (blue light), the respective lights are irradiated. The dispersion medium in the microcapsules sensitive to viscosities thickens or hardens. In a system using a polymerizable compound, the polymerization reaction of the polymerizable compound starts, and the inclusions thicken or harden. At this time, the unexposed portion has fluidity as shown in FIG. 7 (c). Further, FIG. 7D shows a color arrangement when the recording medium after exposure is viewed from above. At this time, the exposed microcapsules are observed as a white color that the fine particles 2d have, and the unexposed microcapsules are observed as a pale color because the white color of the fine particles 2d and the color of the dispersion medium are mixed.

Next, by applying a voltage from outside the capsule, the electrophoretic particles 2 in the microcapsule are discharged.
Each of Y, 2M, and 2C moves according to the charge polarity of the particle itself (FIG. 7 (e)).

In this state, the recorded image is held for a short time,
Further, by exposing the entire surface, the wavelength sensitizer is decolored, and the inside of the entire microcapsule is thickened or hardened and fixed, whereby storage stability of image quality is obtained (FIG. 7 (f), (H)).

After the voltage is applied, when observed from the side where the particles move, electrophoretic particles (2Y, 2M and 2Y) are observed.
The part to which C) is attached looks like the color of the electrophoretic particles (in this case, yellow, magenta, and cyan), and the inside of the capsule exposed before the voltage application is thickened or hardened. The movement of the electrophoretic particles is hindered, the color of the wavelength sensitizer disappears, and the white fine particles dispersed in the dispersion medium become white (FIGS. 7G and 7I).

As another method, in the case of containing colored particles of different colors having different charging polarities, a recording medium using microcapsules for yellow color, magenta color, and cyan color is taken as an example, and its recording principle is shown. Will be described with reference to FIG. In FIG. 8, the white electrophoretic particles 2W, the yellow electrophoretic particles 2Y, the magenta electrophoretic particles 2M, and the cyan electrophoretic particles 2C are used, and the electrophoretic particles 2W and 2Y are yellow. Color microcapsules 1Y, cyan color microcapsules 1C composed of electrophoretic particles 2W and 2C, and electrophoretic particles 2W and 2C.
A magenta color microcapsule 1M composed of M and M is used (FIG. 8A). Note that the observation direction 9 is above the recording medium, and FIG. 8B shows the color arrangement when viewed from the observation surface. Here, the white and yellow electrophoretic particles 2Y, the magenta electrophoretic particles 2M, or the cyan electrophoretic particles 2C that the electrophoretic particles 2W have.
The colors are mixed with each other, and they are lightly colored.

First, by applying a voltage from the outside of the capsule, the electrophoretic particles 2 in the microcapsule 2 are applied.
Each of W, 2Y, 2M, and 2C moves according to the charge polarity of the particle itself (FIG. 8C, movement of electrophoretic particles).

Next, when the recording medium of the present invention is irradiated with visible light having three different wavelengths having an image signal, for example, 7R (red light), 7G (green light), and 7B (blue light), respectively. The dispersion medium in the microcapsules that are sensitive to the light is thickened or hardened. In a system using a polymerizable compound, the polymerization reaction of the polymerizable compound starts, and the inclusions thicken or harden. At this time, the unexposed portion has fluidity (FIG. 8D, curing of the dispersion medium). Also, FIG.
(E) shows the color arrangement when the recording medium is viewed from the observation surface, and the colors of the electrophoretic particles 2Y, 2M, and 2C can be observed respectively.

Next, a voltage is applied in the direction opposite to the direction of the electric field at the time of applying the voltage (FIG. 8 (f), movement of electrophoretic particles). At this time, in the exposed portion of the capsule, the movement of the electrophoretic particles is hindered because the inside is thickened or hardened, but the unexposed portion is fluid and moves to the vicinity of the observation surface side capsule surface. The colored particles that had moved to the side opposite to the observation surface moved to the surface of the capsule on the observation surface side when the voltage was applied previously. From the observation surface, the color of the electrophoretic particles that have moved to the capsule surface on the observation surface side is observed, and an image is formed (FIG. 8 (h)).

In this state, the recorded image is held for a short time,
Furthermore, by exposing the entire surface, the inside of the entire microcapsule is thickened or cured, and fixed,
Storage stability of image quality can be obtained (FIG. 8 (g), curing of the dispersion medium).

Next, the electrophoretic particles and the electrophoretic phenomenon will be described.

The electrophoretic particles are particles that move in the medium by electrophoresis, and are usually charged particles in the medium.

The electrophoretic phenomenon is that when a specific particle is suspended in a medium (dispersion medium), it is electrically charged, and when an electric field is applied in this state, the charged particle passes through the dispersion medium and opposes. This is a phenomenon of migration (electrophoresis) to the electrode side having electric charges. An electric double layer is formed around the electrophoretic particles. The zeta potential is known as a measurable physical quantity of this electric double layer, but this zeta potential largely depends on the surface material of the electrophoretic particles.

The difference in electrophoretic mobility of the electrophoretic particles can be adjusted by the properties of the dispersion medium, that is, the dielectric constant, the viscosity, or the material of the electrophoretic particles.

For example, by surface-treating with different surface-treating agents, electrophoretic particles having different zeta potentials can be produced. When a solution in which electrophoretic particles are dispersed is sandwiched between two electrodes and an electric field is applied between the electrodes, the electrophoretic particles are positive or negative of the zeta potential, that is, depending on the charging polarity, for example, if the electrophoretic particles have negative polarity, The electrophoretic particles migrate to the anode side. This electrophoretic mobility (velocity per unit electric field) is represented by μ = (εζ / 6πη). Here, ε and η are the dielectric constant and viscosity of the liquid, respectively, and ζ is the zeta potential of the particles.

Therefore, particles having a large zeta potential are
Electrophoretic mobility is also large and easily moves, and particles having a small zeta potential have small electrophoretic mobility and are difficult to move.

If the viscosity of the dispersion medium is high, the electrophoretic mobility of the electrophoretic particles is low, and if the viscosity is low, the electrophoretic mobility of the electrophoretic particles is high.

When an electric field is applied so that both the electrophoretic particles having a high electrophoretic mobility and the electrophoretic particles having a low electrophoretic mobility are sufficiently moved, all the electrophoretic particles in the microcapsules move in the direction of the applied voltage. Move in the appropriate direction. Then, when an electric field is applied to such a degree that the electrophoretic particles having high electrophoretic mobility can move sufficiently, but the electrophoretic particles having low electrophoretic mobility cannot move sufficiently, only the electrophoretic particles having high electrophoretic mobility move. However, the electrophoretic particles having a low electrophoretic mobility cannot move, or even move a little.

If the electrophoretic mobility of the electrophoretic particles dispersed in each dispersion medium is given a distribution,
Electrophoretic particles are classified into those that undergo electrophoresis and those that do not, depending on the magnitude of their electrophoretic mobility and the magnitude of the applied electric field. For this reason, the area where the electrophoretic particles hide the dispersion medium differs depending on the magnitude of the electric field, so that various concentrations can be reproduced. In other words, it is possible to express the gradation by the difference in the voltage value of the applied drive voltage or the application time.

In order to give the electrophoretic mobility of the electrophoretic particles a distribution, the electrophoretic particles of different materials may be used to give a potential distribution, or different surface treatment agents may be used to give a zeta potential distribution. May be provided, or the particle size may have a distribution. Even with the same surface treatment agent, the zeta potential can be changed by changing its concentration. In addition, by adjusting the particle diameter and the material, the electrophoretic mobility can be relatively adjusted and binary gradation can be obtained. Further, the gradation expression by area gradation can also be used for the gradation expression.

It is theoretically preferable that the particle size of the microcapsules used in the present invention is as small as possible in order to realize high resolution, but since it has a structure containing electrophoretic particles, it is actually , About 3 μm or more, about 500 μm
The following is desirable.

The volume median diameter of the electrophoretic particles is preferably 5 to 1000 times, preferably 10 to 500 times. 5 to electrophoretic particles
A microcapsule having a volume median diameter of 1000 times can efficiently develop a color tone due to electrophoretic particles. When the volume median diameter of the microcapsules is smaller than 5 times the volume median diameter of the electrophoretic particles, the reflectance of the electrophoretic particles decreases, and vivid color reproduction tends to be difficult to obtain. On the other hand, when it exceeds 1000 times, the migration distance between the electrophoretic particles and the colored particles becomes long, and the electrophoretic response tends to be remarkably reduced.

The method for producing the microcapsules used in the present invention may be a known microencapsulation method, for example, "Kyodo Capsule" written by Asashi Kondo, Nikkan Kogyo Shimbun (197).
In-situ polymerization method, interfacial polymerization method, coacervation method, spray drying method, in-liquid drying method, etc. Particularly, the interfacial polymerization method and the in situ polymerization method are preferable. In the production of the microcapsules, the oil phase / water phase emulsion may be prepared and then encapsulated, or the water phase layer / oil phase emulsion may be prepared and then encapsulated.

The material of the microcapsules is urea-formaldehyde resin, melamine resin, polystyrene, styrene-methacrylate copolymer, styrene-acrylate copolymer, gelatin, polyvinylpyrrolidone, polyvinyl alcohol, polyurethane, polyurea, polyamide, polyester. , Polycarbonate, etc., and two or more of these may be used in combination. Among these, as the capsule wall, gelatin is preferable from the viewpoint of transparency, and melamine resin, urea-formaldehyde resin and the like are preferable from the viewpoint of hardness.

The white particles used in the electrophoretic particles used in the present invention include organic materials, inorganic materials, and organic / organic materials.
It is composed of an inorganic composite material.

Specifically, titanium oxide, titanium dioxide,
Inorganic pigments such as aluminum oxide, zinc oxide, lead oxide, tin oxide, and zirconium oxide, resin dispersion materials such as polyethylene resin of these inorganic pigments, hollow particles made of organic polymers, porous particles made of organic polymers, and inorganic substances And hollow particles, porous particles made of an inorganic substance, and white particles having voids thereof, the surfaces of which are coated with a resin or the like. Due to the difference between the refractive index of the material forming the white particles (about 1.4 to 1.6) and the refractive index of the air in the void (= about 1.0), the white particles having voids inside are Efficiently reflected,
A white tone is provided.

As the colored particles other than white,
A pigment such as an inorganic pigment or an organic pigment, or an organic compound in which a dye is dispersed can be used.

Examples of the inorganic pigments include cadmium yellow, cadmium lipoton yellow, yellow iron oxide, titanium yellow, titanium barium yellow, cadmium orange, cadmium lipoton orange, molybdate orange, red iron oxide, red tin, silver vermillion, cadmium red, Cadmium lipoton red, amber, brown iron oxide, zinc iron chrome brown, chrome green, chrome oxide, viridian, cobalt green, cobalt chrome green, titanium cobalt green, navy blue, cobalt blue, ultramarine blue, cerulean blue, cobalt aluminum chrome blue,
Cobalt violet, mineral violet, carbon black, iron black, manganese ferrite black, cobalt ferrite black, copper chrome black, copper chrome manganese black, titanium black, aluminum powder,
Copper powder, lead powder, bell powder, zinc powder and the like can be mentioned.

Examples of the organic pigment include fast yellow, disazo yellow, condensed azo yellow, anthrapyrimidine yellow, isoindoline yellow, copper azomethine yellow, quinophthaloin yellow, benzimidazolone yellow, nickel dioxime yellow, monoazo yellow lake, Dinitroaniline orange, pyrazolone orange, perinone orange, naphthol red,
Toluidine red, permanent carmine, brilliant fast scarlet, pyrazolone red, rhodamine 6G rake, permanent red, resole red,
Bon Lake Red, Lake Red, Brilliant Carmine, Bordeaux 10B, Naphthol Red, Quinacridone Magenta, Condensed Azo Red, Naphthol Carmine, Perylene Scar Red, Condensed Azo Scar Red, Benzimidazolone Carmine, Anthraquinonyl Red, Perylene Red, Perylene Maroon, Quinacridone maroon, quinacridone scarred, quinacridone red, diketopyrrolopyrrole red, benzimidazolone brown,
Phthalocyanine Green, Victoria Blue Lake, Phthalocyanine Blue, Fast Sky Blue, Alkaline Blue Toner, Indanthrone Blue, Rhodamine B
Examples include lake, methyl violet lake, dioxazine violet, and naphthol violet.

As a common name for organic pigments that are commonly used in Japan,
For yellow, Hansa Yellow, Benzine Yellow, Pigment Yellow 83, Pigment Yellow 110, Pigment Yellow 139 and the like can be used. In red,
Permanent Red, Benzine Orange, Pyrazolone Orange, Vulcano Orange, Orange Lake, Para Red, Lake Red, Toluidine Red, Brillfast Scarlet, Brill Carmine, Brill Scarlet,
Bordeaux, watchung red, resole red, bon maroon, lake bold, rhodamine, madder lake, pigment red 53: 1, pigment red 177, pigment red 221, etc. can be used. In purple, Rhodamine Lake, Dioxazine Violet, Crystal Violet Lake,
Pigment Violet 23 and Pigment Violet 37 can be used. In blue, Victoria Pure Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Fast Sky Blue, Slane Blue R
S, Pigment Blue 15, Pigment Blue 1
5: 3, Pigment Blue 15: 6, etc. can be used. In green, Diamond Green Lake, Phthalocyanine Green, Pigment Green B, Green Gold, Pigment Green 7, Pigment Green 36.
Etc. can be used. In black, diamond black,
Carbon black, pigment black 7, etc. can be used.

In the present invention, these colored particles can be used in various surface-modified forms. In this case, the surface modification method includes a method of coating various compounds including a polymer on the particle surface, a method of coupling treatment with various coupling agents such as titanate / silane, and a method of graft polymerization treatment. Can be given. Further, these colored particles can be used even in a mechanochemically treated form,
It is also possible to use different particles or particles of the same kind, or as composite particles in which polymer particles or hollow polymer particles are combined.

It is preferable that one of the electrophoretic particles used in the present invention is a white particle in terms of the degree of freedom in selecting the color of the other colored particles.

The dispersion medium which is thickened or hardened by light used in the present invention is increased by light irradiation due to physical change such as structure or morphological change, or chemical change such as chemical reaction or physicochemical bond. Examples of the material include viscous, gelling or hardening materials. As an example, a polymerizable compound, and
Examples thereof include a mixture of a polymerizable compound and a polymer compound, a mixture of a polymerizable compound and another solvent, and the like.

As the polymerizable compound, a radical photopolymerizable compound, a cationic photopolymerizable compound, or an anionic photopolymerizable compound can be used. Examples of the photo-radical polymerizable compound include acrylic acid esters, acrylamides, methacrylic acid, methacrylic acid esters, methacrylamides, maleic anhydrides, maleic acid esters, styrenes, vinyl ethers, vinyl esters and allyl. Ethers, silicones, acrylic silicones, mercapto silicones, mercapto /
Examples include deacetone-cured silicone and acrylic / dealcohol-cured silicone. Examples of the cationic photopolymerizable compound include an epoxy resin, an oxetane compound, a vinyl ether compound, a 1-propenyl compound, and an epoxy silicone. Examples of the photoanionic polymerizable compound include cyanoacrylate compounds. Among these, acrylic acid esters, methacrylic acid esters, silicones, and acrylic silicones are preferable in view of characteristics, and in particular, acrylic resin has high photosensitivity and flexibility in selection of photosensitizing wavelength by a wavelength sensitizer. Compounds are preferred.

Specific examples of the acrylic acid esters, methacrylic acid esters, silicones and acrylic silicones include 2-butylaminocarbonyloxyethyl acrylate, 2-N, N-dimethylaminoethyl acrylate and 2-t. -Butylaminoethyl acrylate, 2-t-butylaminoethyl methacrylate, 2-
Diethylaminoethyl acrylate, 2-diethylaminoethyl methacrylate, 2-dimethylaminoethyl acrylate, 2-dimethylaminoethyl methacrylate, 2-dimethylaminopropyl acrylate, 4-2
-Allylaminocarbothionyl carbohydrazonoyl phenyl-3-2-chlorophenyl acrylate, 2-ethylhexyl acrylate, dicyclopentenyloxyethyl acrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, dipentaerythritol hexa Monomers such as acrylate, trimethylolpropane triacrylate, dipentaerythritol polyacrylate, epoxy acrylate, urethane acrylate, polyester acrylate, polysilane, polysiloxane, dimethylpolysiloxane, acrylic modified polysiloxane, mercapto modified polysiloxane, vinyl modified polysiloxane Oligomers, etc. , Alone or can be used in combination of two or more.

As the polymer compound that can be mixed with the dispersion medium, polyester, polyvinyl alcohol,
Polyurethane, polyurea, polyamide, polycarbonate, polyvinyl chloride, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, urea-formaldehyde resin, melamine resin, styrene-methacrylate copolymer, styrene-acrylate copolymer, Gelatin, polyvinylpyrrolidone, polyethylene oxide, polypropylene oxide, ethylene-vinyl alcohol copolymer, polyacetal, methyl cellulose, ethyl cellulose, carboxymethyl cellulose,
Hydroxypropyl cellulose, phenolic resin, fluororesin, silicone resin, diene resin, polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer, polyurethane thermoplastic elastomer, polyester thermoplastic elastomer, polyphenylene ether, polyphenylene sulfide, polyether sulfone, Polyetherketone, polyarylate, aramid,
Polyimide, poly-p-phenylene, poly-p-xylene, poly-p-phenylene vinylene, polyhydantoin, polyparabanic acid, polybenzimidazole, polybenzothiazole, polybenzoxadiazole, polyquinoxaline, arabia gum, casein, styrene- Examples thereof include butadiene rubber, polyvinyl acetate, polyacrylic acid ester, ethylene-vinyl acetate copolymer, or a mixture thereof.

As a solvent that can be mixed with the dispersion medium, aromatic hydrocarbons such as benzene, toluene, xylene, phenylxylylethane and dodecylbenzene,
Diisopropylnaphthalene, aromatic hydrocarbons such as naphthene hydrocarbons, hexane, cyclohexane, kerosene, aliphatic hydrocarbons such as paraffin hydrocarbons, chloroform, trichloroethylene, tetrachloroethylene, trifluoroethylene, tetrafluoroethylene,
Dichloromethane, halogenated hydrocarbons such as ethyl bromide, tricresyl phosphate, trioctyl phosphate, octyl diphenyl phosphate, phosphate esters such as tricyclohexyl phosphate, dibutyl phthalate, dioctyl phthalate, dilauryl phthalate, phthalate Phthalates such as dicyclohexyl acid, butyl oleate, diethylene glycol dibenzoate, dioctyl sebacate, dibutyl sebacate, dioctyl adipate, trioctyl trimellitate, acetyltriethyl citrate, octyl maleate, dibutyl maleate, ethyl acetate, etc. Carboxylic acid esters, isopropyl biphenyl, isoamyl biphenyl, chlorinated paraffin, diisopropyl naphthalene, 1,1-ditolylethane, 1,
Examples thereof include 2-ditolylethane, 2,4-ditertiaryaminophenol, N, N-dibutyl-2-butoxy-5-t-octylaniline, but are not limited thereto. In addition, each may be used alone or in combination of two or more kinds.

Additives may be used to adjust the dielectric constant of the dispersion medium. In this case, the properties required for the additive are that it has a higher dielectric constant than the dispersion soot and that it does not react with the electrophoretic particles.

The reactivity with the electrophoretic particles cannot be unconditionally stated because it varies greatly depending on the composition of the particles, but as a material which can be used as an additive by paying attention to the dielectric constant, specifically,
The following are suitable.

For example, 1-decanol, acetaldehyde, acetonitrile, acetophenone, aniline, anisole, isobutyl alcohol, isobutyronitrile, ethanethiol, methyl ethyl ketone, ethylene glycol, ethylenediamine, epichlorohydrin, allyl chloride, isobutyl chloride, ethyl chloride. , Propyl chloride, benzyl chloride, methyl chloride, 1-octanol, 2
-Octanone, oleic acid, formic acid, xylene, quinoline, guai alcohol, glycerin, cresol, chlorooctane, chlorotoluene, chloroheptane, chlorobenzene, chloroform, pentyl acetate, diethyl ether, carbon tetrachloride, 1,4-dioxane, cyclo Hexanol, cyclohexanone, cyclopentanol, cyclopentanone, dichloroacetone, dichloroethane,
2,2-dichlorodiethyl ether, dichloroethylene, 1,4-dichlorobutane, dichloropropane, dichlorobenzene, divinyl ether, diphenyl ether, dibutyl ether, dipropyl ether, dibromoethylene, dibromobutane, dibromopropane, dibromoheptane, dimethylamine, Dimethyl ether, isobutyl bromide, isopropyl bromide, ethyl bromide, butyl bromide, propyl bromide, diiodoethylene, diethyl sebacate, dioctyl sebacate, dibutyl sebacate, 1
-Decanol, 1,1,2,2-tetrachloroethane,
Tetrachloroethylene, 1,1,2,2-tetrabromoethane, 1-dodecanol, trichloroacetaldehyde, 1,1,1-trichloroethane, tribromoacetaldehyde, 1,2,3-tribromopropane, toluidine, piperidine, pyridine, butanol , Dioctyl phthalate, dibutyl phthalate, 1,4-butanediol, t-butyl alcohol, propanol, propanediol, 1-bromooctadecane, 1-bromooctane, 1-bromo-2-chloroethane, 1-bromo-2-
Chloroethylene, bromocyclohexane, 1-bromotetradecane, 1-bromodecane, 1-bromotridecane, 2-bromo-2-butene, 1-bromohexadecane, 1-bromohexane, 1-bromoheptane, 1-bromopentadecane, 1 -Bromopentane, bromoform, hexachloro-1,3-butadiene, 1-hexadecanol, 1-hexanol, heptanal, 4-heptanal, 4-heptanone, benzaldehyde, 1-pentanol, 2-pentanone, 3-pentanone , Phosgene, formamide, methylamine, 4-methylcyclohexanol, 2-methylcyclohexanone, 2-methylpyridine, isobutyl iodide, isopropyl iodide, ethyl iodide, butyl iodide, propyl iodide, methyl iodide, 1- Iodine octa , 1-iodo-hexadecane,
Examples thereof include 1-iodohexane, 1-iodopentane, and siloxanes.

The dispersion medium used in the present invention may be colored. Examples of dyes or pigments that can be used for coloring the dispersion medium include basic dyes, oil-soluble dyes, and disperse dyes. Among them, examples of dyes that can be preferably used in the invention are shown below.

The basic dyes include Basic Red 12, Basic Red 27, Basic Violet 7, Basic Violet 10, Basic Violet 4
0, Basic Blue 1, Basic Blue 7, Basic Blue 26, Basic Blue 77, Basic Green 1 and Basic Yellow 21.

Examples of the oil-soluble dyes include Solvent Red 125 and Solvent Red 13
2, Solvent Red 83, Solvent Red 10
9, Solvent Blue 67, Solvent Blue 25, Solvent Yellow (Solvent Ye)
llow) 25, solvent yellow 89, solvent
Yellow 146 is given.

As the disperse dye, Disperse Red 60, Disperse Red 7
2, Disperse Blue 56, Disperse Blue 60, Disperse Yellow (Di
Other than azo dye, metal complex salt dye, nafur dye, anthraquinone dye, indigo dye, carbonium dye, quinoimine dye, cyanine dye, quinoline dye, nitro dye, nitroso dye, benzoquinone dye, naphthoquinone dye, naphthalimide dye,
Examples include penolin dyes and phthalocyanine dyes.

Oil-soluble dyes are particularly preferable. Also, these dyes can be used in combination.

Examples of the photopolymerization initiator used in the present invention include a photopolymerization initiator for photoradical polymerization and a photopolymerization initiator for cationic photopolymerization.

Examples of the photopolymerization initiator for photoradical polymerization include aromatic carbonyl compounds, acetophenones, triazines, trichlorotriazines, organic peroxides, organic halides, azo compounds, dye-borate complexes and metals. An arene complex, a dye derivative iodonium salt, a dye derivative alkyl borate, and the like are used.
For example, (η5-2,4-cyclopentadiene-1-
Yl) [(1,2,3,4,5,6-η)-(1-methylethyl) benzene] iron (1+) hexafluorophosphate (1-), 4,4′-tetrakis (t-butyldi) Oxycarbonyl) benzophenone, 2- [7- (1,
3-Dihydro-1,3,3-trimethyl-2H-indole-2-ylidene) -1,3,5-heptadentrienyl] -3H-indolium butyltriphenylborate, 2,4-trichloromethyl (piperonyl) ) -6-Triazine, 2,4,6-tris (trihalomethyl)-
1,3,5-triazine and its 2-position, or its 2- and 4-position-substituted compounds, phthalimidotrihalomethanesulfonate and its compound having a substituent on the benzene ring, and naphthalimidotrihalomethanesulfonate and its compound Examples thereof include compounds having a substituent on the benzene ring.

As the polymerization initiator having sensitivity in the visible light region, a mixture of titanocene, a metal arene complex and a dye, or a compound which generates a radical by an intramolecular electron transfer reaction accompanying photoexcitation in the visible light region, for example, a cyanine dye Examples thereof include alkyl borate salts of dye derivatives such as butyl triphenyl borate which is a derivative.

Examples of the photopolymerization initiator for photocationic polymerization include diazonium salts, aromatic onium salts, aromatic iodonium salts, sulfonium salts, triphenylsulfonium salts, thioxanthone derivatives, and benzophenone derivatives.

The photopolymerization initiator is used in an amount of 0.
It is used in a ratio of 1 to 20% by weight, more preferably 0.5 to 10% by weight. If it is less than 0.1%, the polymerization reaction tends to be difficult to proceed, and if it exceeds 20%, the sensitivity tends to be hardly improved.

If necessary, such as when polysilane is used as the polymerizable compound, an oxidizing agent such as amine oxide and phosphine oxide may be added together with the radical polymerization photopolymerization initiator.

In order to adjust the wavelength of the photopolymerization initiator,
A wavelength sensitizer can be used together with the photopolymerization initiator. The wavelength sensitizer used in the present invention may be selected from those that absorb a specific wavelength of the exposure source used. For example, acrylic orange dye, benzofuran dye, merocyanine dye, xanthene dye, cyanine dye, thiazine dye, azine dye, methine dye, oxazine dye, phenylmethane dye, azo dye,
Examples include anthraquinone dyes, pyrazoline dyes, stilbene dyes, quinoline dyes, rhodamine dyes, safranine dyes, malachite green dyes, methylene blue dyes, coumarin dyes, squarylium dyes, and dye derivative alkylborates. For red light, a squarylium dye is preferable, for green light, a cyanine dye or a merocyanine dye is preferable, and for blue light, a coumarin dye or a merocyanine dye is preferable.

The dye for wavelength sensitization and the dye for coloring the dispersion medium may be the same or different. Further, as a sensitizing dye used in combination with a photopolymerization initiator, a decolorizable dye that disappears upon irradiation with light may be used so as not to impair the color of the dispersion medium colored by the dye.

Further, in the microcapsules of the present invention, in addition to the dispersion medium and the electrophoretic particle particles, the surface charge amount of the electrophoretic particle is controlled, the dispersibility is enhanced, and the like.
It is also possible to appropriately select and use various auxiliary components. Surfactants, protective colloid agents and the like can be used as these auxiliary components, but the auxiliary components are not limited to these.

As the above-mentioned surfactant, a nonionic (nonionic) type surfactant capable of being dissolved or mixed in a dispersant with respect to a dispersant, an anionic type surfactant, a cationic type surfactant, an amphoteric The ionic surfactants of the system surfactants can be used alone or in combination of two or more. Specific examples of these surfactants include the following, but the surfactant used in the present invention is not limited to these.

Examples of nonionic surfactants include polyoxyethylene nonylphenol ether, polyoxyethylene dinonylphenol ether, polyoxyethylene octylphenol ether, polyoxyethylene styrenated phenol, polyoxypolyoxyethylene bisphenol A, polyoxyethylene nonylphenyl. Ether, polyoxyethylene octyl phenyl ether,
And polyoxyalkylene alkylphenol ethers such as nonylphenol ethoxylate, polyoxyethylene, castor oil, polyoxyalkylene block polymer, polyoxyethylene cetyl ether, polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, and Polyoxyalkylene ethers such as polyoxypropylene ether, monool type polyoxyalkylene glycol, diol type polyoxyalkylene glycol, triol type polyoxyalkylene glycol, monool block type polyalkylene glycol, diol block Type polyalkylene glycol, and random type polyalkylene Glycols such as recall, octylphenol ethoxylates, oleyl alcohol ethoxylates, primary linear alcohol ethoxylates such as lauryl alcohol ethoxylates and secondary linear alcohol ethoxylates, and alkyl alcohol ethers such as polynuclear phenol ethoxylates , Polyoxyethylene rosin ester, polyoxyethylene lauryl ester, polyoxyethylene oleyl ester, and polyoxyethylene stearyl ester and other polyoxyalkylene alkyl esters, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, Sorbitan dilaurate, sorbitan dipalmitate, sorbitan distearate, sorbitan sesquilaurate, sorby Sorbitan fatty acid esters such as sesquipalmitate and sorbitan sesquistearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan dilaurate, poly Polyoxyethylene sorbitan esters such as oxyethylene sorbitan dipalmitate, polyoxyethylene sorbitan distearate, polyoxyethylene sorbitan sesquilaurate, polyoxyethylene sorbitan sesquipalmitate, and polyoxyethylene sorbitan sesquistearate, saturated fatty acids Methyl ester, unsaturated fatty acid methyl ester, saturated fatty acid butyl ester, unsaturated fatty acid butyl ester, saturated fatty acid Fatty acid esters such as stearyl ester, unsaturated fatty acid stearyl ester, saturated fatty acid octyl ester, unsaturated fatty acid octyl ester, stearic acid polyethylene glycol ester, oleic acid polyethylene glycol ester, and rosin polyethylene glycol ester, stearic acid, oleic acid, palmitin Fatty acids such as acids, lauric acid, myristic acid, and amide compounds of these fatty acids, polyoxyethylene lauryl amine, polyoxyethylene alkylamines, polyoxyethylene alkylamines such as polyoxyethylene alkylamine ethers, lauric acid Higher fatty acid monoethanolamides such as monoethanolamide and coconut fatty acid diethanolamide, higher fatty acid diethanolamides, Polyoxyethylene stearic acid amide, coconut diethanolamide (1-2 type / 1-1
Type), amide compounds such as alkylalkylolamide and alkanolamides, and general formula R- (CH ₂ C
_{H 2 O) m H (CH} 2 CH 2 O) n H and _{R-NH-C 3 H 6} -
Alkanolamines represented by NH ₂ [R = oleyl / octyl / dodecyl / tetradecyl / hexadecyl / octadecyl / coconut / beef tallow / soybean, etc.], general formula R-NH
₂ [R = oleyl, octyl, dodecyl, tetradecyl, hexadecyl, octadecyl, coconut, beef tallow, soybean, etc.]
A primary amine represented by the general formula R1R2-NH [R1
R2 = R = oleyl / octyl / dodecyl / tetradecyl / hexadecyl / octadecyl / coconut / beef tallow / soybean, etc.], the general formula R1R2R3N
[R1, R2, R3 = oleyl octyl dodecyl
Tetradecyl, hexadecyl, ochradecyl, coconut, beef tallow, soybean, etc.], various synthetic and natural higher alcohols, acrylic acid compounds, polycarboxylic acid compounds, hydroxy fatty acid oligomers, and Polymers such as modified hydroxy fatty acid oligomers, and oligomers are included.

Examples of the anionic surfactants include polycarboxylic acid type polymer surfactants, polycarboxylic acid type anion surfactants, special fatty acid soaps, carboxylic acid salts such as rosin soaps, castor oil sulfate ester salts, and lauryl alcohol. Sulfate salts of lauryl alcohol, sulfate amine salt of lauryl alcohol, natural alcohol sulfate ester Na salt and higher alcohol sulfate ester Na salt, sulfate ester amine salt of lauryl alcohol ether, sulfate salt of lauryl alcohol ether Ester Na salt, sulfate amine salt of synthetic higher alcohol ether, sulfate Na salt of synthetic higher alcohol ether, alkyl polyether sulfate amine salt, alkyl polyether sulfate Na salt,
Natural alcohol EO (ethylene oxide) addition type sulfuric acid ester amine salt, natural alcohol EO (ethylene oxide) addition type sulfuric acid ester Na salt, synthetic alcohol E
O (ethylene oxide) addition type sulfuric acid ester amine salt, synthetic alcohol EO (ethylene oxide) addition type sulfuric acid ester Na salt, alkylphenol EO (ethylene oxide) addition type sulfuric acid ester amine salt, alkylphenol EO (ethylene oxide) addition type sulfuric acid ester Na salt, polyoxy Sulfuric acid ester salts such as ethylene nonyl phenyl ether sulfuric acid ester amine salt, polyoxyethylene nonyl phenyl ether sulfuric acid ester Na salt, polyoxyethylene polycyclic phenyl ether sulfuric acid ester amine salt, and polyoxyethylene polycyclic phenyl ether sulfuric acid ester Na salt, Various alkyl allyl sulfonate amine salts, various alkyl allyl sulfonate Na
Salts, naphthalenesulfonic acid amine salts, naphthalenesulfonic acid Na salts, various alkylbenzenesulfonic acid amine salts, various alkylbenzenesulfonic acid Na salts, naphthalenesulfonic acid condensates, naphthalenesulfonic acid formalin condensates, and other sulfonates, polyoxyethylene Nonyl phenyl ether sulfonate amine salt, polyoxyethylene nonyl phenyl ether sulfonate Na
Salt, polyoxyethylene special allyl ether sulfonic acid amine salt, polyoxyethylene special allyl ether sulfonic acid Na salt, polyoxyethylene tridecyl phenyl ether sulfonic acid amine salt, polyoxyethylene tridecyl phenyl ether sulfonic acid Na salt, polyoxy Polyoxyalkylene-based sulfonates such as ethylene alkyl ether sulfonate amine salt and polyoxyethylene alkyl ether sulfonate Na salt, dialkyl sulfosuccinate amine salt, dialkyl sulfosuccinate Na salt, polycyclic phenyl polyethoxy sulfosuccinate Amine salt, polycyclic phenyl polyethoxysulfosuccinate Na salt, polyoxyethylene alkyl ether sulfosuccinic acid monoester amine salt, and polyoxyethylene alky Ruthenium sulfosuccinate monoester Na salt and other sulfosuccinate salts, alkyl phosphates, alkoxyalkyl phosphates, higher alcohol phosphates, higher alcohol phosphates, alkylphenol phosphates, aromatic phosphates , Phosphoric acid esters such as polyoxyalkylene alkyl ether phosphoric acid ester, and polyoxyalkylene alkyl allyl ether phosphoric acid ester, and phosphoric acid salts.

As the cationic surfactant, a compound represented by the general formula R
-N (CH ₃ ) ₃ X [R = stearyl / cetyl / lauryl / oleyl / dodecyl / coconut / soybean / beef tallow / X = halogen / amine etc.] alkyltrimethylamine-based quaternary ammonium salt, tetramethylamine Quaternary ammonium salts such as system salts and tetrabutylamine salts, acetic acid salts represented by the general formula (RNH ₃ ) (CH ₃ COO) [R = stearyl / cetyl / lauryl / oleyl / dodecyl / coconut / soybean / beef tallow, etc.] , Lauryldimethylbenzylammonium salt (halogen / amine salt, etc.), stearyldimethylbenzylammonium salt (halogen / amine salt, etc.), and dodecyldimethylbenzylammonium salt (halogen / amine salt, etc.), and other benzylamine-based quaternary ammonium salts, And the general formula R (CH ₃ ).
N (C ₂ H ₄ O) _m H (C ₂ H ₄ O) _n · X [R = stearyl, cetyl, lauryl, oleyl, dodecyl, coconut, soybean, beef tallow, etc./X = halogen, amine, etc.] Examples thereof include polyoxyalkylene-based quaternary ammonium salts.

As the amphoteric surfactant, various betaine type surfactants, various imidazoline type surfactants, β
-Alanine type surfactants, polyoctyl polyaminoethylglycine hydrochloride and the like.

As the protective colloid agent, various protective colloid agents which can be dissolved in the dispersion medium or mixed in a dispersed state can be used. For example,
Examples thereof include, but are not limited to, polyvinyl alcohol, styrene-maleic anhydride copolymer, and partial hydrolysates thereof.

Further, in the recording medium of the present invention, a photosensitive recording material obtained by mixing the above-mentioned color-forming capsules is coated on a support such as paper, glass or film together with a binder if necessary, It can be obtained by providing a protective layer or the like. The color recording layer obtained by coating is 1
It may be a layer, or two or more color recording layers may be laminated.

The binder material is the same material as the wall material of the microcapsule or polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinyldene chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polyvinyl alcohol, polyethylene oxide, Polypropylene oxide, ethylene-vinyl alcohol copolymer, polyacetal, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, phenol resin, fluororesin, silicone resin, diene resin, polystyrene-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer, polyurethane-based Thermoplastic elastomer, polyester thermoplastic elastomer, polyphenylene ether, polyphenylene sulph De, polyether sulfone, polyether ketone, polyarylate, aramide,
Polyimide, poly-p-phenylene, poly-p-xylene, poly-p-phenylene vinylene, polyhydantoin, polyparabanic acid, polybenzimidazole, polybenzothiazole, polybenzoxadiazole, polyquinoxaline, arabia gum, gelatin, polyvinylpyrrolidone , Casein, styrene-butadiene rubber, polyvinyl acetate, polyacrylic acid ester, ethylene-vinyl acetate copolymer, or a mixture thereof, and various emulsions thereof can be used. In order to effectively apply an electric field to the capsule particles, a material having a dielectric constant equal to or higher than that of the dispersion medium is preferably used as the binder material. Further, as the dielectric constant adjusting agent, it is also possible to add the above-mentioned materials such as alcohol, ketone or carboxylate to the binder material.

The recording medium of the present invention may be provided with a protective layer on the photosensitive layer in order to improve light fastness. The protective layer is preferably coated with an emulsion of a water-soluble polymer or a hydrophobic polymer.

In the present invention, if necessary, an intermediate layer may be provided between the color recording layer and the support or between the laminated color recording layers in order to improve color reproducibility. As these materials, it is preferable to apply an emulsion of a water-soluble polymer or a hydrophobic polymer.

The support used in the present invention is, for example, paper, high-quality paper, coated paper or the like, polyester,
Polyethylene, polypropylene, acetyl cellulose,
In addition to films and resins such as polyvinyl acetal, polystyrene, polycarbonate, polyethylene terephthalate, and polyimide, synthetic paper composed of paper and resins, and inorganic materials such as metal and glass. A conductive material may be mixed with these materials, and a material obtained by applying a conductive material or vapor-depositing a metal on these materials can be used. An example is a polyester film with aluminum vapor-deposited.

A bar coater, a roll coater, a blade coater, an air knife coater or the like can be used to coat the support with the photosensitive recording material of the present invention.

In the recording method of the present invention, the light used may be visible light, infrared light, or ultraviolet light, and these photosensitive wavelengths can be adjusted by selecting the material.
In recording on a color recording material using a plurality of electrophoretic microcapsules of the present invention, it is preferable to use light in the wavelength region of 300 nm to 900 nm, from the viewpoint of device and energy consumption, and 400 nm to 800 nm.
More preferably, light in the wavelength range of nm is used. Therefore, it is preferable that the visible light polymerization initiator or the wavelength sensitizer used has the maximum value of the absorption spectrum in the wavelength range of 400 nm to 800 nm.

In the recording method of the present invention, a corona charger, a roller type voltage applying device, a sandwich type electrode or the like can be used as a voltage applying means. However,
The voltage applying means is not limited to these.

In the recording method of the present invention, a halogen lamp, a helium xenon lamp, a mercury xenon lamp, a metal halogen lamp, a fluorescent lamp, a light emitting diode, a semiconductor laser or the like can be used as a light source for exposure. A color filter and an interference filter may be used together to adjust the wavelength and the amount of light. However, the light source is not limited to these.

As a device used for recording using the recording material of the present invention, the voltage applying device and the exposure light source may exist as separate devices as independent processes, but both the voltage applying device and the exposure light source may be present. You may use the printing apparatus which mounted at least.

[0107]

EXAMPLES Example 1 (1) Preparation of Electrophoresis Microcapsules Photopolymerization Initiator (Ciba Geigy, Irgacure 18)
4) 5 g of a mixture of neopentyl glycol diacrylate and trimethylolpropane triacrylate (100 g) was added to white pigment-dispersed resin fine particles (Sekisui Plastics Co., Ltd., Techpolymer MB30X-5 White).
0.0 g was added and ultrasonically dispersed for about 30 minutes. Next,
Black pigment dispersed resin fine particles (Techpolymer MB30X-5
Black, Sekisui Plastics Co., Ltd.) 5 g, and using a zirconia bead with a paint shaker, about 1.
Dispersion was carried out for 0 hours to obtain an electrophoretic particle liquid (A1 liquid).

Next, 10 parts of a styrene-maleic anhydride copolymer partial hydrolyzate (trade name: Scripset-520 / manufactured by Monsanto) was dissolved in 190 parts of distilled water, and a small amount of sodium hydroxide was added, The pH was adjusted to 4.6. The solution A1 was added to this solution and emulsified and dispersed. Next, 60 parts of a melamine-formalin initial polycondensate (trade name: Sumirez Resin 613 / Sumitomo Chemical Co., Ltd.) was added to this emulsion, and the system was stirred at 75 ° C. for 2 hours to bring the solution to room temperature. After cooling, a slurry of microcapsules (B1) was obtained. In the obtained microcapsules, positively charged black pigment dispersion resin fine particles and negatively charged white pigment dispersion resin fine particles are dispersed in a transparent color dispersion medium, and the volume median diameter thereof is about 50 μm. The volume-median diameter of the pigment-dispersed fine particles was about 5 μm.

(2) Recording medium using electrophoretic microcapsules 20 g of the electrophoretic microcapsules (B1) prepared above was added to 80 g of a 5% polyvinyl alcohol aqueous solution to prepare a dispersion liquid. This dispersion is subjected to the bar coating method,
It was applied on a 200 μm thick aluminum vapor-deposited polyester film to obtain a recording medium having a photosensitive layer having a dry film thickness of 60 μm.

(3) Recording using electrophoretic microcapsule type recording medium A voltage of -100 V was applied to the recording medium prepared in (2) by a roller type voltage applying device. After that, a Hg-Xe lamp (light intensity at 350 nm, 2 m
W / cm ² ) was used for exposure for 10 minutes to remove the mask. Next, a voltage of + 100V was applied by a roller type voltage application device. Then, again on the entire surface, H
g-Xe lamp (light intensity at 350 nm 2 mW / c
m ² ) for 10 minutes for exposure and fixing. As a result, a recorded image that faithfully reproduces the information of the mask was obtained.

Example 2 (1) Preparation of Electrophoresis Microcapsules Photopolymerization Initiator (IRGACURE 18 manufactured by Ciba-Geigy)
4) In 100 ml of neopentyl glycol diacrylate containing 5%, hollow particles of cross-linked styrene-acrylic copolymer (SX-866A, manufactured by JSR Corporation) 10.0.
g and 5.0 g of oleic acid were added and ultrasonically dispersed for about 30 minutes. Next, 1.0 g of carbon black was added to this solution, and the mixture was dispersed for about 2.5 hours by a paint shaker using zirconia beads to obtain an electrophoretic particle liquid (A2 liquid).

Separately, 6 parts by weight of a 2% sodium dodecylbenzenesulfonate solution was added to prepare 64 parts by weight of a 6% by weight aqueous gelatin solution. The solution A2 was added to this solution, and the mixture was emulsified and dispersed using a homogenizer. To the obtained emulsion, 64 parts by weight of a 6% aqueous solution of arabic rubber was added at 40 ° C.
Mixed in. To this solution, 20 parts by weight of warm water of 40 ° C. was added, and a few milliliters of 10% acetic acid aqueous solution was added dropwise.
Cooled to ° C. Then, a few milliliters of 30% formalin was added to this solution, and a sodium hydroxide solution was added so that the pH value of the solution was 9, and the heating rate was 1 ° C / min.
Then, the temperature was raised to 50 ° C. The solution was cooled to room temperature to obtain a slurry of microcapsules (B2) having gelatin as a wall material. In the obtained microcapsules, positively charged black carbon black and hollow particles not positively charged were dispersed in a transparent dispersion medium, and the volume median diameter was about 55 μm. Volume median diameter is about 0.3
μm, and the volume median diameter of carbon black was about 0.5 μm.

(2) Recording medium using electrophoretic microcapsules 20 g of the electrophoretic microcapsules (B2) prepared above was added to 80 g of a 5% polyvinyl alcohol aqueous solution to prepare a dispersion liquid. This dispersion is applied to 200 μm thick polyethylene laminated paper by the bar coating method,
A recording medium having a photosensitive layer having a dry film thickness of 70 μm was obtained.

(3) Recording using the electrophoretic microcapsule type recording medium The recording medium prepared in (2) is cut out in a pattern composed of lines and planes and passed through a mask which blocks transmission of light. , Hg-Xe lamp (light intensity at 350 nm, ² mW / cm ² ) was used for exposure for 10 minutes to remove the mask. Next, a corona charger was used to carry out negative charging. Then, once again, Hg-Xe was applied to the entire surface.
A lamp (light intensity at 350 nm, ² mW / cm ² ) was used for 10 minutes for exposure and fixing. As a result, a recorded image that faithfully reproduces the information of the mask was obtained.

Example 3 Photopolymerization initiator (Irgacure 18 manufactured by Ciba Geigy)
4) A mixture of neopentyl glycol diacrylate containing 5% and trimethylolpropane triacrylate 1
Phthalocyanine pigment (manufactured by Dainippon Ink and Chemicals, Inc.) 5.0 g was mixed with 00 g. Then, 30 g of 2 μm zirconia beads was pulverized and dispersed in a paint shaker for 2.5 hours, and further white pigment-dispersed resin fine particles (Sekisui Plastics Co., Ltd., Techpolymer MB30) were dispersed.
X-5 white) 10.0 g was added and ultrasonically dispersed for about 30 minutes to obtain an electrophoretic particle liquid. In the obtained microcapsules, positively charged blue phthalocyanine-based pigment and negatively charged white pigment-dispersed resin fine particles are dispersed in a transparent color dispersion medium, and the volume median diameter is about 50 μm. The phthalocyanine-based pigment had a volume median diameter of about 1.2 μm, and the white pigment-dispersed resin fine particles had a volume median diameter of about 5 μm. A recording medium was manufactured in the same manner as in Example 1 except for the above.

A voltage of -100 V was applied to the surface of the recording medium by using a roller type voltage applying device. Next, a Hg-Xe lamp (light intensity at 350 nm 2 mW /
using cm ^2), it was subjected to exposure for 10 minutes. continue,
The mask is removed, a roller type voltage applying device is used to apply a voltage of +100 V to the surface of the recording medium, and the voltage is applied again.
Hg-Xe lamp (light intensity 2mW at 350nm
/ Cm ² ) and exposed for 10 minutes to fix. As a result, a recorded image represented by two colors of white and blue, which faithfully reproduced the information held by the mask, was obtained.

Example 4 In Example 3, Ciba Geigy Irgacure 184 was used.
A mixture of trimethylolpropane triacrylate and tetrachloroethylene containing 5% by weight of 2,4-trichloromethyl (piperonyl) -6-triazine, instead of the mixture of neopentyl glycol diacrylate containing 5% of trimethylolpropane triacrylate.
A recording medium was prepared by using a squarylium dye having an absorption peak at 650 nm (manufactured by Hayashibara Biological Laboratory Co., Ltd.) as a wavelength sensitizer.

A negative charge was applied to the surface of the recording medium thus produced by a corona charger. Next, a filter that cuts out a light of a wavelength of 500 nm or less from a 300 W halogen lamp through a mask that cuts out the transmission of light and is an interference filter having a transmission peak at 650 nm, which is cut out in a pattern formed of lines and surfaces. The mask was removed by exposing for 10 seconds using the light ( ² mW / cm ² ) that passed through. Subsequently, the surface of the recording medium was charged with a positive charge by a corona charger, and the entire surface was again exposed and fixed for 15 seconds using a 300 W halogen lamp. As a result, the color of the sensitizing dye was erased due to its bleaching performance, and a recorded image in which the information held by the mask was faithfully reproduced by the contrast based on the particles of the two colors encapsulated was obtained.

Example 5 (1) Preparation of Electrophoresis Microcapsules for Cyan Color 100 g of a mixture of neopentyl glycol diacrylate and trimethylolpropane triacrylate was added to squalilium having an optical absorption peak at 660 nm as a wavelength sensitizing dye. 1.0 g of a dye (manufactured by Hayashibara Biochemical Laboratory Co., Ltd.) and 5 g of 2,4-trichloromethyl (piperonyl) -6-triazine as a photopolymerization initiator were dissolved. 5.0 g of a phthalocyanine pigment (manufactured by Dainippon Ink and Chemicals, Inc., fine particle good dispersion type) was mixed with this solution, and 30 g of 2 μm zirconia beads was pulverized and dispersed together with a paint shaker for 2.5 hours. Next, titanium dioxide was mixed with low molecular weight polyethylene (Allied Signal AC-617A) in this solution and pulverized to obtain pigment-dispersed fine particles (volume median particle diameter: 1.5 μm) 1
0.0 g was added and ultrasonically dispersed for about 30 minutes to obtain an electrophoretic microcapsule liquid (A5C liquid).

Separately, a styrene-maleic anhydride copolymer (trade name: Scripset-520 / manufactured by Monsanto Co.) was dissolved with a small amount of sodium hydroxide, and this was dissolved at 5 wt% and pH.
200 parts of the aqueous solution prepared in 4.6 was prepared. The above A5C solution was added to this solution, and this was emulsified and dispersed. Next, melamine-formalin initial polycondensate was added to this emulsion (trade name: Sumirez Resin 613 / Sumitomo Chemical Co., Ltd.).
60 parts was added. After stirring the system at 75 ° C. for 2 hours, the solution was cooled to room temperature to obtain a slurry of cyan electrophoretic microcapsules (C). In the obtained microcapsules, positively charged blue phthalocyanine pigment and negatively charged white pigment dispersion fine particles were dispersed in a lightly colored dispersion medium, and the volume median diameter was about 18 μm.
m, the volume median diameter of the phthalocyanine-based pigment is about 1.2.
μm, the volume median diameter of the pigment-dispersed fine particles was about 1.5 μm.

(2) Preparation of electrophoretic microcapsules for magenta color In (1), instead of the squarylium dye having an optical absorption peak at 660 nm, a merocyanine dye having an optical absorption peak at 540 nm ((Ltd.) Electrophoretic microcapsules for magenta (using Hayashibara Biochemical Research Laboratories) and using thioindigo red instead of 5.0 g of phthalocyanine pigments (manufactured by Dainippon Ink and Chemicals, Inc.) A slurry of M) was obtained. The resulting microcapsules, positively charged red thioindigo red and negatively charged white pigment dispersion fine particles,
Dispersed in a lightly colored dispersion medium, the volume median diameter is about 20 μm, the volume median diameter of the thioindigo red is about 1.5 μm, and the volume median diameter of the pigment dispersion fine particles is about 1.5 μm.
was μm.

(3) Preparation of electrophoretic microcapsules for yellow color In the procedure (1), a merocyanine dye having an optical absorption peak at 430 nm (available from Co., Ltd.) is used instead of the squarylium dye having an optical absorption peak at 660 nm. Hayashibara Biochemical Research Laboratories) was used, and benzene yellow GR was used instead of 5.0 g of the phthalocyanine pigment (manufactured by Dainippon Ink and Chemicals, Inc.). A slurry of Y) was obtained. The obtained microcapsules, positively charged yellow benzine yellow GR and negatively charged white pigment dispersion fine particles are dispersed in a lightly colored dispersion medium, and the volume median diameter thereof is about 18 μm. The benzine yellow GR had a volume median diameter of about 2.0 μm, and the pigment-dispersed fine particles had a volume median diameter of about 1.5 μm.

(4) Recording medium using electrophoretic microcapsules 20 g of each of the electrophoretic microcapsules Y, M, and C prepared in (1) to (3) above was added to 240 g of a 5% polyvinyl alcohol aqueous solution to form capsules. Were mixed with stirring so that the mixture was uniformly dispersed. This dispersion was applied to a 200 μm thick aluminum vapor-deposited polyester film by a bar coating method to obtain a recording medium having a photosensitive layer having a dry film thickness of 40 μm.

(5) Recording by Electrophoresis Microcapsule Type Recording Medium Next, the result of an image forming experiment using the obtained recording medium will be described. A voltage was applied by a roller type voltage applying device set to a voltage of -50V. Next, using red light, green light, and blue light LEDs with image signals, each 1 mJ
Exposed with / cm ^2, then, by applying a voltage at a voltage application roller which is set at a voltage + 50 V, to obtain an image. Next, light irradiation with a fluorescent lamp was carried out for 10 seconds to fix. At this time, the image formed on the recording medium was a clear color image.

Example 6 (1) Preparation of electrophoretic microcapsules for black color In (1) of Example 5, instead of the phthalocyanine-based pigment, positively charged carbon black and 2,4-trichloro as a photopolymerization initiator were used. Electrophoresis microcapsules for black (K) in a similar manner except that 5 g of Irgacure 184 (manufactured by Ciba Geigy) having sensitivity to ultraviolet light was used instead of methyl (piperonyl) -6-triazine.
A slurry of was obtained. The resulting microcapsules, positively charged black carbon black and negatively charged white pigment dispersion fine particles are dispersed in a transparent color dispersion medium,
The volume median diameter was about 22 μm, the carbon black had a volume median diameter of about 0.5 μm, and the pigment-dispersed fine particles had a volume median diameter of about 1.5 μm.

(2) Recording medium using electrophoretic microcapsules Electrophoresis produced by electrophoretic microcapsules Y, M, C and (1) prepared in the same manner as in Example 5 (1) to (3). 20g of microcapsules K, 5%
In addition to 300 g of polyvinyl alcohol aqueous solution, the mixture was stirred and mixed so that the capsules were uniformly dispersed. This dispersion was applied to a 200 μm thick aluminum vapor-deposited polyester film by a bar coating method to obtain a recording medium having a photosensitive layer having a dry film thickness of 40 μm.

(3) Recording by Electrophoresis Microcapsule Type Recording Medium Next, the result of an image forming experiment using the obtained recording medium will be described. A voltage was applied by a roller type voltage applying device set to a voltage of -50V. Next, using red light, green light, and blue light LEDs with image signals, each 1 mJ
/ Cm ² and further, in order to control the electrophoretic microcapsules K, it is exposed with 1 mJ / cm ² of UV light having a wavelength of 350 nm and having an image signal, and then voltage +50 V
An image was obtained by applying a voltage with the roller type voltage applying device set to. Next, fixing was carried out for 15 seconds with an Hg-Xe lamp (light intensity at 350 nm, ² mW / cm ² ). At this time, the image formed on the recording medium was a clear color image.

[0128]

According to the first photosensitive recording material of the present invention,
At least two or more kinds of colored particles having different color tones are included,
Since at least one of the particles contains a microcapsule containing colored particles, which are charged particles, and a dispersion medium that is thickened or hardened by light, it is a recording material writable by light and has excellent color developability. In addition, it is possible to provide a high-resolution, low energy consumption photosensitive recording material that does not cause background coloration.

Furthermore, when at least one of the colored particles is a white particle, the contrast with the colored portion after recording is improved and the visibility is enhanced.

According to the second photosensitive recording material of the present invention, in the first photosensitive recording material, since the dispersion medium contains a polymerizable compound, a physical change such as a structure or morphological change due to light irradiation, or The dispersion medium can be thickened, gelled or hardened by a chemical reaction such as a chemical reaction or a physicochemical bond.

Further, when the polymerizable compound is an acrylic compound, it has a high photosensitivity and has an effect that there is a degree of freedom in selection of a photosensitizing wavelength by a wavelength sensitizer or the like.

According to the third photosensitive recording material of the present invention, since the first or second photosensitive recording material further contains a photopolymerization initiator, or a photopolymerization initiator and a wavelength sensitizer, The wavelength sensitizer has the effect of advancing the polymerization reaction by irradiation and adjusting the wavelength of the photopolymerization initiator.

The fourth photosensitive recording material of the present invention comprises the first, second
Alternatively, the photosensitive recording material of No. 3 contains a visible light polymerization initiator or a wavelength sensitizer having an absorption spectrum maximum in the wavelength range of 400 nm to 800 nm.
A photosensitive recording material can be obtained which can be exposed to light having a wavelength between 00 nm and 800 nm and can be recorded with low energy consumption.

According to the fifth photosensitive recording material of the present invention, in the first, second, third or fourth photosensitive recording material, at least three primary colors of cyan, magenta and yellow, or three primary colors of red, green and blue. Since at least three types of microcapsules containing colored particles having any one of the colors and particles having a color different from that of the colored particles are included, full-color expression is possible.

According to the sixth photosensitive recording material of the present invention, since the fifth photosensitive recording material further includes microcapsules containing colored particles having a black color, full-color expression is possible.

According to the seventh photosensitive recording material of the present invention, in the fifth or sixth photosensitive recording material, at least 3
Since each of the types of microcapsules contains a photopolymerization initiator having an absorption spectrum maximum at a different wavelength, or a photopolymerization initiator and a wavelength sensitizer having an absorption spectrum maximum at a different wavelength, The capsules are sensitive to light of different wavelengths, enabling full-color expression.

According to the first photosensitive recording medium of the present invention, the first, second, third, fourth, fifth, sixth or seventh photosensitive recording material is coated on a support, It is possible to provide a recording medium that is writable by light, has excellent coloring properties, does not cause background coloring, and has high resolution and low energy consumption.

According to the first recording method of the present invention,
Since the recording method includes a step of irradiating light on the photosensitive recording material of No. 2, 3, 4, 5, 6, 7 or the first photosensitive recording medium and a step of applying an electric field, it is excellent in color development and It is possible to provide a recording method with high resolution and low energy consumption, which is free from ground color.

Furthermore, when an electric field in the direction opposite to the direction of the electric field is applied, the colored particles moved according to the direction of the electric field applied in the former stage and the colored particles moved according to the electric field in the opposite direction applied in the latter stage. It is possible to obtain a recorded image.

According to the second recording method of the present invention, in the first recording method, since the irradiation light is light having three or more different wavelengths, a capsule having sensitivity to light having different wavelengths is used. Using, full color expression is possible.

Further, by irradiating with light, the inclusions of the microcapsules can be further thickened or partially or wholly cured to be fixed.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a microcapsule used in the present invention.

FIG. 2 is a schematic diagram showing a state of a microcapsule used in the present invention before and after voltage application.

FIG. 3 is a schematic view showing an example of a microcapsule color developing material used in the present invention.

FIG. 4 is a schematic diagram showing an embodiment of a recording medium of the present invention.

FIG. 5 is a schematic diagram showing an embodiment of a recording medium of the present invention.

FIG. 6 is a schematic view showing an embodiment of a recording medium of the present invention.

FIG. 7 is a schematic diagram illustrating a recording principle using the recording medium of the present invention.

FIG. 8 is a schematic diagram illustrating a recording principle using the recording medium of the present invention.

[Explanation of symbols]

1 microcapsule, 1Y yellow microcapsule, 1M magenta microcapsule, 1C cyan microcapsule, 2 electrophoretic particles, 2a white pigment particles, 2b colored pigment particles, 2c colored pigment particles,
2d white fine particles, 2C color pigment particles, 2M color pigment particles, 2Y color pigment particles, 2W color pigment particles, 3
Dispersion medium, 4 microcapsule wall, 5 support, 6 protective layer, 7B blue light, 7R red light, 7G green light, 8
Light, 9 observation directions.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2H025 AA02 AA04 AB20 AC01 AD01                       AD03 BC13 BC42 BH00 BJ03                       CA00 CC11 FA12 FA28 FA30                 2H096 AA30 BA20 EA02 GA36

Claims (10)

[Claims] 1. A microcapsule containing at least two kinds of colored particles having different color tones, at least one of which is a charged particle, and a dispersion medium which is thickened or cured by light. Including photosensitive recording material. 2. The photosensitive recording material according to claim 1, wherein the dispersion medium contains a polymerizable compound. 3. The photosensitive recording material according to claim 1, further comprising a photopolymerization initiator, or a photopolymerization initiator and a wavelength sensitizer. 4. The photosensitive recording material according to claim 1, 2 or 3, which contains a visible light polymerization initiator or a wavelength sensitizer having an absorption spectrum maximum in a wavelength range of 400 nm to 800 nm. 5. A colored particle having at least one of the three primary colors of cyan, magenta, and yellow, or the three primary colors of red, green, and blue, and a particle having a color different from that of the colored particle are included. The photosensitive recording material according to claim 1, 2, 3, or 4, which contains at least three types of microcapsules. 6. The photosensitive recording material according to claim 5, further comprising microcapsules containing colored particles having a black color. 7. Each of the at least three types of microcapsules has a photopolymerization initiator having an absorption spectrum maximum at a different wavelength, or a wavelength increasing compound having an absorption spectrum maximum at a wavelength different from the photopolymerization initiator. The photosensitive recording material according to claim 5, further comprising a sensitizer. 8. A method according to claim 1, 2, 3, 4, 5, 6 or 7.
A photosensitive recording medium obtained by coating the above-mentioned photosensitive recording material on a support. 9. A recording comprising: a step of irradiating the photosensitive recording material according to any one of claims 1, 2, 3, 4, 5, 6, 7 or the photosensitive recording medium according to claim 8 with light; and a step of applying an electric field. Method. 10. The recording method according to claim 9, wherein the irradiation light is light having three or more different wavelengths.