KR100932401B1 - Microcapsules containing electrophoretic color organic / inorganic composite particles and preparation method thereof - Google Patents

Abstract

The present invention relates to a method for preparing microcapsules containing electrophoretic color organic / inorganic composite particles for the purpose of implementing a next-generation electrophoretic electronic paper display system. The electrophoretic microcapsules according to the present invention are polarizable of polar functional groups. A core consisting of charged pigment particles and a dielectric medium in which the pigment particles are dispersed, and a capsule coated to surround the core in a spherical shape. The present invention also includes an electrophoretic display device comprising the electrophoretic microcapsules, wherein the electrophoretic display device according to the present invention comprises an upper substrate and a lower substrate facing each other, and a transparent formed on the upper substrate and the lower substrate, respectively. It consists of a plurality of electrophoretic microcapsules provided between the electrode and the transparent electrode. The method of manufacturing the electrophoretic microcapsules comprises the steps of forming a colloidal solution in which color inorganic / organic particles are dispersed in a solvent, mixing a dielectric medium and a capsule base with the colloidal solution to form a uniform mixture, and the And forming a capsule crystal to spherically surround the color inorganic / organic pigment color particles and the dielectric medium.

Description

Microcapsules containing electrophoretic color organic / inorganic composite particles and preparation method thereof {MICROCAPSULE EMPLOYING ELECTROPHORETIC COLOR HYBRID PARTICLES AND METHOD FOR FABRICATION THEREOF}

The present invention relates to microcapsules containing electrophoretic color organic / inorganic composite particles, and a method of manufacturing the same. The present invention relates to white, black, red, and green, which are provided with polarized charges of polar functional groups. A core comprising a pigment particle comprising a pigment composition having any one of Green, Blue, and Yellow, and a dielectric medium in which the pigment is dispersed, and a spherical shape around the core. Microcapsules containing color organic / inorganic composite particles for electrophoretic displays comprising capsules coated to enclose, and to form the mixture by adding a core composition to the capsule substrate to form the mixture to form the color organic / inorganic composite particles The present invention relates to a method for producing a microcapsule containing.

The electrophoretic display device has the ability to store images without any additional energy due to the high bisability that maintains the original image without applying an external electric field, providing excellent flexibility and portability. It is a type of flat panel display using electrophoresis (the phenomenon in which charged colloidal particles move toward the anode or cathode in an electric field), which has characteristics such as durability and light weight.

The electrophoretic display device has the characteristics closest to the paper texture, exhibits a light reflection efficiency that is similar to or slightly higher than a newspaper having a light reflection efficiency of about 40%, and an excellent contrast ratio, and is thin and bent like paper or plastic. It is a reflective display that drives electrophoretic suspension by applying transparent electrode to easy base film, and will be spotlighted as next-generation electronic paper to succeed liquid crystal display, plasma display panel, organic electroluminescent device. It is an expected device. In particular, electronic paper is a flexible substrate such as a thin plastic with tens of millions of beads, and a display device that can display characters or images. It is a device that can erase tens of millions of times and repeat writing. It is expected to replace the existing print media.

Electrophoretic displays using electrophoretic phenomena are the core elements of flexible displays and are based on the electrophoretic properties of electromagnetism by applying an electromagnetic field to a conductive material, and the fine particles charged between thin flexible substrates. After distributing them, the image is expressed by changing the arrangement of the particles due to the change of polarity of the electromagnetic field. More specifically, when an external electric field is applied, the positively charged particles move to the negative electrode to display the color of these particles (eg white). Also, when a positive voltage is applied, the particles move inversely so that the color of the fluid (e.g. For example, a non-light-emitting reflective information display device using a phenomenon of displaying blue color. When electrophoresis occurs in the core composition, charged particles are determined by the dielectric properties and charge of the fluid, the magnitude of applied electric field, and viscous drag. It will move at the velocity it becomes.

Early electrophoretic displays of US-based E-Ink used a white dielectric medium with a blue dielectric medium on titanium dioxide (TiO ₂ ) particles with excellent white reflectivity, resulting in a white image on a blue background. It is possible to produce a microcapsule in which black fine particles are dispersed, and black / white display is possible.

1 illustrates a structure of an electrophoretic display display device using microcapsules of a display device for an electrophoretic display according to the prior art. As shown, the microcapsule consists of a dielectric medium 103, a capsule 108 coated to enclose a plurality of white charged particles 104 and a plurality of black charged particles 105 in the dielectric medium 103. This is provided between the upper and lower transparent electrodes 102 and 107 stacked on the upper and lower substrates 101 and 106.

The charged particles 104 and 105 have ionic functional groups directly introduced into fine particles such as a thermoplastic vinyl polymer, a thermoplastic silicone polymer, a thermosetting polymer, or a copolymer of these monomers. When the mixture is positioned between the upper and lower transparent electrodes and a voltage is applied, charged particles 104 and 105 are attracted to each electrode according to the applied electrode polarity. When the − voltage is applied to the upper electrode 102 and the + voltage is applied to the lower electrode 107, the positively charged white charged particles 104 move to the upper substrate 102 and the negatively charged black charged particles 105. ) Moves toward the lower substrate 106. That is, text or an image is displayed by this explanation method.

However, the dyes that make color in these microcapsules are included in the microparticles in the charged particles in the microcapsules. Since the dyes are generally water-soluble or oil-soluble, the dye is dissolved into the liquid used as the dielectric medium and spilled. Can be. In addition, dyes are very poor in stability against oxidation, so when they are exposed to atmospheric air at a relatively high temperature for a long time, discoloration may rapidly progress. In addition, ultraviolet rays easily destroy functional groups such as double bonds of the chemical structure of the dyes. Causes decomposition. For this reason, the conventional electrophoretic display device has a fatal problem that the color expression ability is deteriorated. As a result, not only the gradation of color is degraded but also the response speed is slowed, and the image is broken when the color image is implemented. It happened.

Even now, research and proposal for manufacturing a variety of color display using a color filter in an electrophoretic display using a microcapsule, but there is a disadvantage that the gradation and sharpness of the color is very poor. In such an electrophoretic display microcapsules, various manufacturing techniques for realizing color are urgently required.

Accordingly, the present invention has been made in order to solve the above problems, it has a color of any one of white, black, red, green, blue, yellow is given a polarized positive charge of the polar functional group in the electrophoretic display device. Is a microcapsule containing electrophoretic color organic / inorganic composite particles comprising a core composed of a pigment particle and a dielectric medium in which the pigment particle is dispersed, and a capsule coated to surround the core in a spherical form, and to prepare the same. To provide a method for this.

The present invention is intended to implement a color image of the device for electrophoretic display by a simple manufacturing process without changing the electrical properties of the particles by the color pigment without a separate color filter or color composition of the core.

In addition, in the microcapsules, in the case of the composite particles including the pigment, since the pigment has little solubility, the pigment does not spill into the liquid used as the dielectric medium in the composite particles, and the color development ability is stable with almost no change over time. The purpose of the present invention is to provide excellent and stable color gradation, increase electrophoresis reaction speed, and provide clear picture quality with excellent color reproduction characteristics.

Electrophoretic microcapsules according to the present invention for achieving the above object, the core consisting of a pigment particles imparted with a polarizable charge of a polar functional group and a dielectric medium in which the pigment particles are dispersed, and surrounds the spherical shape around the core It is made of a capsule coated with a soda.

The present invention includes an electrophoretic display device including the electrophoretic microcapsules, and the electrophoretic display device according to the present invention includes an upper substrate and a lower substrate facing each other, and transparent electrodes formed on the upper substrate and the lower substrate, respectively. And a plurality of electrophoretic microcapsules provided between the transparent electrodes.

The method of manufacturing the electrophoretic microcapsules comprises the steps of forming a colloidal solution in which color inorganic / organic particles are dispersed in a solvent, mixing a dielectric medium and a capsule base with the colloidal solution to form a uniform mixture, and the And forming a capsule crystal to spherically surround the color inorganic / organic pigment color particles and the dielectric medium.

The present invention provides a core comprising a white pigment, a black pigment, a red pigment, a green pigment, a blue pigment, a yellow pigment, and a pigment imparted with a polarizable positive charge of a polar functional group, and coated so as to spherically surround the core. A microcapsule containing electrophoretic color organic / inorganic composite particles comprising microcapsules containing electrophoretic color particles consisting of a capsule containing a composition is prepared to distinguish a dielectric medium containing particles from pigments expressing color. It is characterized by being made. In particular, the color particles can provide a color image of the electrophoretic display when the microcapsules contain the color particles for the electrophoretic display of the present invention. The present invention increases the electrophoretic reaction speed and its response speed in the form of microcapsules of electrophoretic display dispersed in a dielectric medium containing color charged particles, thereby providing vivid image quality such as excellent color reproduction characteristics. It works.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The invention may be better understood by the following examples, which are intended for purposes of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

Figure 2 is a cross-sectional view showing an electrophoretic display device including a microcapsule for an electrophoretic display according to the present invention.

The electrophoretic display device according to the present invention includes upper and lower substrates 201 and 207 facing each other, transparent electrodes 202 and 206 formed on the upper and lower substrates 201 and 207, and the two transparent electrodes 202 and 206, respectively. It comprises a plurality of microcapsules for electrophoretic display (209) provided between.

Referring to the drawings, microcapsules for electrophoretic display (hereinafter, microcapsules) 209 are composed of a pigment medium 203 dispersed in a dielectric medium 204 and the dielectric medium 204 and given a polarized charge of a polar functional group. A core and a capsule 205 surrounding the core composition, ie, the dielectric medium 204 and the pigment particles 203.

The pigment particles 203 of the microcapsules 209 are composed of a composition of organic or / and inorganic materials having polar functional groups and color composite particles containing color pigments. Such color composite particles are endowed with polarized positive charges of the polar functional groups. Any one of a white pigment, a black pigment, a red pigment, a green pigment, a blue pigment, and a yellow pigment. It is distributed.

In the electrophoretic microcapsules according to the present invention, the optical contrast ratio consists mainly of the movement of the charged pigment particles 203 dispersed in the dielectric medium 204. For example, when the charged particles move toward the viewer, the charged particles scatter the incident light to show the color of the particles. In this case, when the charged particles are blue particles, they represent blue, and when green particles, green. . Thus, a visual contrast ratio can be achieved. As described above, in the electrophoretic display, the color image is expressed by the color composition of the pigment composition contained in the core, in particular, the mixture of the light passing through the capsule containing the pigment expressing the colors of red, green, and blue. This would be possible.

In the electrophoretic display using the microcapsules, in order to implement a variety of colors vividly using the pigment composition should be given the following functionality. That is, light must be scattered or absorbed by the moving charged particles, and the charged particles must move smoothly without being affected by the core so that the electrical properties of the particles do not change. Therefore, in order to manufacture microcapsules used in electrophoretic displays, it is important to reduce the influence between the charged particles and the cores so that their electrical characteristics do not change.

By the way, in the conventional invention, the microcapsules of the electrophoretic display were colored with dyes. However, the dye is easily dissolved in the dielectric medium and poor in stability to oxidation, causing many problems. In the present invention, a pigment is used instead of a dye to solve the above problem. Unlike dyes, pigments have a very high intermolecular bond to form a dense crystal structure. Thus, the number of dielectric medium in which the pigment is usually dissolved is very small. Therefore, unlike dyes, color pigments can be stably maintained because they have little solubility in liquids used as dielectric medium. In addition, since it has a dense crystal structure, there is almost no direct or large-scale contact between the oxidizing oxygen gas and the pigment molecule, and the pigment itself has excellent UV stability, thus solving the stabilization problem that has been raised.

The organic / inorganic material serves to cause the pigment particles to be charged by polarization. The organic material / inorganic material is characterized in that it does not have a direct charge but has a polar functional group and is polarized by an induced current between the anode and the cathode. The materials which can be used here are colored organic / inorganic particles which can be any butadiene, styrene, isoprene, methacrylic acid, methyl methacrylate, acrylonitrile, vinyl chloride, acrylic acid, sodium styrene sulfonate, vinyl acetate, Chlorostyrene, dimethylaminopropylmethacrylamide, isocyanoethyl methacrylate, N-isobutoxymethacrylamide and the like, and may be conjugated diene compounds such as diacrylate, triacrylate, dimethylacrylate and Trimethyl acrylate and the like.

In the present invention, the pigment and the organic / inorganic substance having a polar functional group are combined to exist in the microcapsules as color composite particles. (So, also referred to as color organic / inorganic (composite) particles.) Pigment composition composed of color composite particles May be a pure compound or a mixture of compounds for reaching a particular color. The pigment composition contained in the microcapsules according to the present invention is white, black, red, green, yellow, yellow, blue to which polarized positive charges of polar functional groups are given. It is preferable to contain a pigment of one color, but is not limited thereto.

The pigment composition according to the present invention is preferably an organic or inorganic pigment, and the pigment may be used in admixture with a pigment carrier composed of color resins, precursors thereof or mixtures thereof. As a pigment which concerns on this invention, an organic or inorganic pigment can be used individually or in mixture of 2 or more types. Important properties here include light resistance, solubility in dielectric medium, color and cost. The pigment may be a pure compound or a mixture of pigments for reaching a particular color, including color. If desired the pigment will be suitable for displays in which the color depends on the position of the particles.

While there are many pigments that can be selected for use in encapsulated electrophoretic displays, pigments with high color development, high heat resistance, in particular high heat decomposition resistance, are preferred, and organic pigments can usually be used. They can generally be selected from the group of azo, anthraquinone, and triphenylmethane type pigments and can be chemically modified to increase solubility in oil and reduce absorption by the particle surface.

Useful pigments include azo pigments, cyanine pigments including copper phthalocyanine pigments, organic pigments such as anthraquinone pigments, or TiO ₂ , calcium carbonate, talc, black iron oxide, cadmium red, molybdenum red, cadmium yellow, cobalt green, Inorganic pigments such as cobalt blue, manganese violet and cobalt violet, or acetylene black and carbon black.

The color microcapsule for electrophoretic display according to the present invention comprising a core and a capsule containing inorganic and organic color particles and a dielectric medium has a diameter within a range of 50 μm to 200 μm in order to have uniform mobility over a certain range under an electric field. It is desirable to have.

The dielectric medium 204 may be selected from a variety of solvents depending on the chemical inertness, the density matched with the electrophoretic particles or the chemical miscibility of the electrophoretic particles and capsule. Organic solvents such as fatty acid such as hexadecane hydrocarbons, decahydronaphthalene, 5-ethylidene-2-norbornene, animal oils, vegetable oils, Paraffin oil, toluene, aromatic hydrocarbons, toluene, xylene, phenylxylylethane, dodecylbenzene, alkylnaphthalene, halogenated hydrocarbons, perfluoro Perfluorodecalin, perfluorotoluene, perfluoroxylene, dichlorobenzotrifluoride, trichlorobenzotrifluoride, chloropentafluorobenzene ), Dichlorononane, pentachlorobenzene, and perfluoro solvents FC-43, FC-70 and FC-5060 (3M cycles) ), And the like (as Halocarbon Oil) type of the poly-chloro-trifluoro ethylene (poly (chlorotrifluoroethylene) Halocarbon oil), the iso-phage (IsoparG), Isopar series type may be used. In this case, the dielectric medium 204 is preferably an organic solvent selected from one or more of halocarbon oil, isophage and hexadecane.

In addition, it is useful for such organic solvents to have a low dielectric constant, high volume resistivity, low viscosity, low toxicity and low environmental impact water solubility, high specific gravity, high specific gravity and low reflection index, especially the dielectric constant ranges from 2 to 30 It is desirable to have a low dielectric constant of. In addition, the dielectric medium 204 not only prevents agglomeration of surface modifiers for modifying the surface energy or charge of the electrophoretic particles or binding capsules, and charge control agents and electrophoretic particles for providing good mobility to the electrophoretic particles. Stabilizers may be further included to prevent the electrophoretic particles from irreversibly depositing on the capsule wall surface.

These microcapsules 209 having the above-described structure are provided between the upper and lower substrates 201 and 207 bonded with the hot melt adhesive 208, and are fixed between the upper and lower transparent electrodes 202 and 206, and the voltage is fixed. When applied, the colored particles 203 which are instantaneously charged by the polarization phenomenon of the polar functional group are attracted to each electrode according to the applied electrode polarity. When the − voltage is applied to the upper electrode 202 and the + voltage is applied to the lower electrode 206, the charged color charged particles 203 move to the upper substrate 201, and in the opposite case, the lower substrate 207. Move to). Conventionally, there is a problem in that a full packing is not made in packing a transparent electrode using a binder. In order to make a full packing, a material called surlin, which is a hot melt adhesive 208, may be used to complete packing. Formed.

Figure 3 is a photograph showing a microcapsule for electrophoretic display according to the present invention. As shown, the microcapsule type electrophoretic display is composed of a plurality of microcapsules (tens of millions if necessary). In this case, in the microcapsules according to the present invention, color pigments for expressing color are dispersed in the dielectric medium.

The present invention includes a method for producing a microcapsule for electrophoretic display to satisfy such conditions. In particular, in the preparation method of the microcapsules containing the color particles having the same composition as described above, in the method of producing microcapsules containing the electrophoretic color organic / inorganic composite particles according to the present invention, the charged particles and the core composition It should be well distributed, which will be described below with reference to the drawings.

3 is a flowchart illustrating a method of manufacturing a microcapsule for an electrophoretic display according to a preferred embodiment of the present invention.

Referring to FIG. 3, first, color inorganic / organic particles are dispersed in a dielectric medium to form a colloidal solution in which color inorganic or / and organic particles are dispersed (301), and the dielectric medium and the capsule substrate are colloidal solutions. Mixing to form a uniform mixture 302 and forming the capsule crystals 305 such that the capsule substrate is spherically surrounding the colored inorganic or / under organic particles and the dielectric medium.

In this case, a dispersant may be used when forming the colloidal solution in order to increase the concentration of the inorganic or organic particles with respect to the solvent. Preferred dispersants include sodium laulyl sulfate (SLS), sodium dodecyl sulfate (SDS), TWEEN, SPAN ^TM (sorbitan ester), TWEEN ^TM (ethylene oxide adduct of sorbitan ester), and the like.

First, the step of forming the colloidal solution is described, in order to form the colloidal solution, chemical methods such as in-situ polymerization, polymer phase separation, dispersion polymerization, mini- or micro-emulsion polymerization, suspension polymerization precipitation, solvent evaporation, seeding emulsion polymerization Or any method that falls within the scope of general microencapsulation. A typical method of this type is a phase separation process in which the dissolved polymeric material precipitates out of solution on a dispersed pigment surface through solvent dilution, evaporation or thermal change.

In step 301, in order to form the colloidal solution, a certain ratio of inorganic or organic color particles was added to the solvent, and a dispersant was added thereto as necessary, followed by dispersion according to a phase separation method. The pigment particles used to achieve color in the process according to the invention, in this case, should be soluble in the capsule base of the capsule, but are generally insoluble in other components of the dielectric medium.

TiO ₂ , calcium carbonate, talc, black iron oxide, cadmium red, molybdenum red, cadmium yellow, cobalt green, cobalt blue, manganese violet, cobalt violet, etc. may be used as the organic or / and inorganic particles used in the preparation method. It is not limited to those exemplified above. The inorganic or organic particles may be dispersed in a non-aqueous solvent, for example, a solvent selected from the group consisting of hydrocarbons such as dichloromethane or derivatives thereof, halogenated hydrocarbons, halogenated hydrocarbon oils, iso-based materials and mixtures thereof. As well as a water-soluble solvent selected from the group consisting of distilled water, pure water, ion exchange water, reverse osmosis water, methanol, ethanol, isopropanol, butanol, octanol, ethylene glycol, diethylene glycol, glycerin and mixtures thereof , Mixtures of water soluble solvents and water-insoluble solvents may be used.

Such colored inorganic / organic particles are suitably imparted with pigments to particles having high refractive index, high scattering coefficient and low absorption coefficient, in particular polarized positive charge of polar functional groups. At this time, the colored organic / inorganic particles may be any butadiene, styrene, isoprene, methacrylic acid, methyl methacrylate, acrylonitrile, vinyl chloride, acrylic acid, sodium styrene sulfonate, vinyl acetate, chlorostyrene, dimethyl, or any other latex copolymer. Aminopropyl methacrylamide, isocyanoethyl methacrylate, N-isobutoxymethacrylamide and the like, and may be conjugated diene compounds such as diacrylate, triacrylate, dimethyl acrylate and trimethyl acrylate, etc. It may optionally include a substance of.

Thereafter, a uniform mixture of the core composition and the capsule base and the colloidal solution is formed (step 302). At this time, the mixing ratio of the core composition, the capsule substrate and the colloidal solution is 5 to 15 wt.%, And 85 to 95 wt.% Based on the weight, wherein the mixing ratio of the dielectric medium and the pigment particles in the core composition is about 5 to 15 wt. .% And 0.01-1 wt.% Are preferred.

The capsule base is not particularly limited, but a material useful for a phase separation process is preferable. For example, transparent polymers such as polystyrene, polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, ethyl cellulose, polyvinyl pyridine, and polyacrylonitrile are preferred, and melamine-formaldehyde polymer is most preferred. desirable. The melamine-formaldehyde polymer used as capsule base in the present invention is soluble with the core composition, which forms a capsule that is coated to surround the core.

The capsule substrate is a polymer of styrene, methyl methacrylate, ethyl methacrylate, butyl methacrylate, vinyl pyridine, acrylonitrile, melamine-formaldehyde, and as a polymerization initiator, benzoyl peroxide, 2,2'- Oil-soluble initiators such as azobis (2-methylpropionitrile) and 2,2'-azobis (2,4-dimethylbareronitrile), and water-soluble initiators such as potassium persulfate and ammonium persulfate are used.

Here, the step of forming a uniform mixture of the core composition and capsule base and the colloidal solution may be formed by uniformly mixing each of the core composition and capsule base in the colloidal solution (step 303), and the core composition and It is also preferable to form an aqueous binder containing a capsule base by uniformly mixing the colloidal solution (step 304). That is, first, the temperature of the solution is heated to a temperature above the melting point of the core composition and the capsule base containing color particles while rapidly stirring the prepared uniform mixture colloidal solution. At this time, the pigment particles and the capsule base may be added in a solid state, respectively (step 303), it is also possible to be dissolved in a small amount of solvent by the aqueous binder (step 304).

The aqueous binder is used as an adhesive medium that not only supports and protects the capsule but also binds the electrode material to the capsule dispersion, preferably a melamine-formaldehyde aqueous binder, wherein the capsule may be formed from the melamine-formaldehyde polymer. will be. Then, the colloidal solution containing the core composition and the capsule base is added for about 15 minutes so that the core composition and the capsule base containing the color particles can be uniformly distributed between the solvent and the inorganic and organic color particles. Stir. At this time, ultrasonic waves may be applied at the same time for effective particle dispersion.

Subsequently, if a uniform mixture of the core composition and the capsule base and the colloidal solution is obtained, the mixture is stirred while the core composition and the capsule base are crystallized to surround the inorganic and organic color particles in a spherical shape. Lower the temperature of (step 305). At this time, the temperature of the mixture may be lowered slowly or quenched, but the optimum production temperature of the microcapsules is 50 ~ 80 ℃, it is preferable to slowly cool to room temperature without a separate quenching process. As a result, crystals in which the core composition and the capsule base are coated on the inorganic and organic color particles are obtained.

1 is a cross-sectional view showing the structure of a microcapsule in which two kinds of pigments are dispersed in a dielectric medium of a display device for a conventional electrophoretic display.

Figure 2 is a cross-sectional view showing the structure of the microcapsules in which one color pigment is dispersed in the dielectric medium of the display device for an electrophoretic display according to the present invention.

Figure 3 is a photograph showing the electrophoretic microcapsules according to the present invention.

Figure 4 is a flow chart for explaining a method of manufacturing microcapsules for electrophoretic display according to a preferred embodiment of the present invention.

Claims (14)

A core composed of a pigment particle having any one of red, blue and yellow colors, to which a polarized charge of a polar functional group is given, and a dielectric medium in which the pigment particles are dispersed; Electrophoretic microcapsule, characterized in that consisting of a capsule made of a transparent polymer resin coated to surround the core around the sphere. delete The method of claim 1, The pigment particles are organic or inorganic pigment particles, and organic pigments including azo (azo), cyanine, including an phthalocyanine pigment, anthraquinone series, cadmium red, molybdenum red, cadmium yellow, cobalt green, cobalt blue, manganese An electrophoretic microcapsule comprising at least one pigment selected from the group consisting of violet and inorganic pigments including cobalt violet. The method of claim 3, The pigment particles are butadiene, styrene, isoprene, methacrylic acid, methyl methacrylate, acrylonitrile, vinyl chloride, acrylic acid, sodium styrene sulfonate, vinyl acetate, chlorostyrene, dimethylaminopropylmethacrylamide, isocyanoethyl Electrophoretic micro, characterized in that it further comprises at least one material selected from the group consisting of methacrylate, latex copolymer of N-isobutoxy methacrylamide, diacrylate, triacrylate, dimethyl acrylate, trimethyl acrylate capsule. The method of claim 1, The dielectric medium is hexadecane, decahydronaphthalene, 5-ethylidene-2-norbornene, animal oil, vegetable oil, paraffin oil, toluene ), Xylene, phenylxylylethane, dodecylbenzene, alkylnaphthalene, perfluorodecalin, perfluorotoluene, perfluorotoluene (perfluoroxylene), dichlorobenzotrifluoride, trichloro benzotrifluoride, chloropentafluoro-benzene, dichlorononane, pentachlorobenzene, FC- 43, FC-70, FC-5060, polychlorotrifluoroethylene (poly (chlorotrifluoroethylene)) characterized in that it comprises at least one material selected from the group consisting of Electrophoretic microcapsules. The method of claim 1, Electrophoretic microcapsules, characterized in that the diameter of the capsule is 50㎛ 200㎛. delete The method of claim 1, The transparent polymer resin is any one selected from the group consisting of polystyrene, polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate, ethyl cellulose, polyvinyl pyridine, polyacrylonitrile, and melamine-formaldehyde polymer Electrophoretic microcapsules, characterized in that the transparent polymer resin. An upper substrate and a lower substrate facing each other; Transparent electrodes formed on the upper substrate and the lower substrate, respectively; And An electrophoretic display device comprising a plurality of electrophoretic microcapsules according to claim 1 provided between the transparent electrode. The method of claim 9, And the upper substrate and the lower substrate are bonded by hot melt adhesive. Forming a colloidal solution in which inorganic / organic pigment particles having any one of red, blue and yellow colors are dispersed in a solvent; Mixing a dielectric medium and a capsule base with the colloidal solution to form a uniform mixture; And A method for producing an electrophoretic microcapsule according to claim 1, comprising the step of forming a capsule crystal so as to spherically surround the colored inorganic / organic pigment particles and the dielectric medium. The method of claim 11, The solvent is a method of producing an electrophoretic microcapsule, characterized in that a water-soluble solvent, a water-insoluble solvent or a mixture of a water-soluble solvent and a water-insoluble solvent. The method of claim 12, The water-soluble solvent is selected from distilled water, pure water, ion-exchanged water, reverse osmosis water, methanol, ethanol, isopropanol, butanol, octanol, ethylene glycol, diethylene glycol, glycerin, or a mixture thereof. Method for producing an electrophoretic microcapsule. The method of claim 11, Forming a homogeneous mixture by mixing the dielectric medium and the capsule substrate with the colloidal solution, the pigment particles and the capsule substrate are added in a solid state, respectively, or dissolved in a small amount of solvent by an aqueous binder is electrophoretic Method for preparing microcapsules.

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