JP2000338318A - Color filter and production of this color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin film color filter which is improved in the adhesive strength with an electrode substrate and is excellent in process-proofness and durability. SOLUTION: This color filer is produced by immersing the substrate having a transparent electrically conductive film into dispersion liquid in which the micelle formation of pigments having the spectroscopic characteristics of three primary colors proceeds in an aqueous medium by using a surfactant which has electrochemically oxidizable and/or reducible parts, and subjecting the substrate to the energizing treatment in such a manner that the equilibrium concentration of the surfactant in the micelle dispersion liquid is set to be 0.05-0.15 mmol/l, where the average transmissivity of 380-780 nm visible light is >=60%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a color filter used in a color display device such as a color liquid crystal display and a method for manufacturing the same.

2. Description of the Related Art There are various information display devices such as CRTs, but liquid crystal display devices are used in various fields. In particular, devices that require portability are small, light, and have low power consumption. Therefore, it is used in many devices. In addition, color technology has advanced, and various methods for producing color filters for liquid crystals, such as a dyeing method, a pigment dispersion method, an electrodeposition method, a printing method, and a micellar electrolytic method, have been proposed. is there. Among these, in the dyeing method, the pigment dispersion method, the printing method, and the like, red (R), green (G), blue (B), and a light-shielding layer provided to prevent light leakage and enhance contrast, In the pattern formation of BK), it is necessary to accurately position each position with respect to another pattern. For example, a black pattern is formed first, and the red, green, and blue patterns are formed while being precisely aligned with the black pattern. In addition, it is necessary to align the color filter pattern with the electrode for driving the liquid crystal.

In this respect, in electrochemical methods such as electrodeposition and micellar electrolysis, photolithography is used when patterning a transparent electrode, but such precise alignment is not required. Furthermore, the micellar electrolysis method can form a conductive color filter layer, and the color filter layer can be used as a liquid crystal drive electrode without laminating a liquid crystal drive electrode on the color filter layer again. For this reason, the micelle electrolysis method has established a basic technology (J.
Am. Chem. Soc 1991, 113, 450-4
56, Patent Publications 1812057 and 2027520, and JP-A-2-146001), various studies have been made toward practical use. In particular, since there is no need for precise alignment, it is highly applicable to plastic film substrates in addition to ordinary glass substrates.

Recently, a liquid crystal display device using a plastic film has been used for portable equipment such as a mobile phone and an electronic organizer. The plastic film has a thickness of about 0.1 to 0.3 mm and is light in weight, so that it is most suitable for portable equipment. Further, if a reflection-type liquid crystal display which does not require a backlight, is small and lightweight, and can achieve low power consumption and is colorized using a plastic film, portability is greatly improved.

[0005] However, the filter produced by the micellar electrolysis method does not have good adhesion to the electrode substrate as compared with other methods, and the electrolysis is required to form red, green, and blue thin films. This is repeated three times. In this case, the color filter dye that has once adhered to the electrode is mixed into the electrolyte of another color, or the dye in the electrolyte of another color is already deposited. This has caused problems such as a decrease in color purity by being mixed into the color filters used.

Further, a film having a thickness of 1 μm, such as that used for a flexible film substrate or a reflection type liquid crystal display.
Hereinafter, in the case of a thin film color filter having an average transmittance of 60% or more in visible light (380 to 780 nm), the thin film color filter does not have practically sufficient adhesion, and it is presently difficult to obtain a uniform color filter. . In order to solve this problem, measures such as defining the particle size of the dispersed particles and hydrophobizing the electrode surface have been proposed.However, these filters use color filters for conventional transmission-type liquid crystal displays. The effect is recognized for a film having a thickness of several μm or more, and a sufficient effect is not obtained in the case of a thin film having a thickness of 1 μm or less.

[0007]

Accordingly, the present invention provides a thin film color filter which has improved adhesion between the color filter and the electrode substrate, and has excellent process resistance and durability.
And a method for producing the color filter.

[0008]

Means for Solving the Problems The inventors of the present invention have proposed a method of preparing a dye having spectral characteristics of three primary colors in an aqueous medium by using a surfactant having a site capable of electrochemically oxidizing and / or reducing. In a method for producing a color filter by immersing a substrate having a transparent conductive thin film in a dispersion dispersion, the equilibrium concentration of the surfactant in the micelle dispersion is set to 0.1.
It has been found that a uniform color filter having good adhesion, excellent process resistance and excellent durability can be produced by conducting an electric current with a concentration of 0.5 to 0.15 mmol, and the present invention has been achieved.

That is, the color filter of the present invention comprises:
The visible light region (380 nm to 780) of the color filter
nm), a sufficient adhesion can be ensured even when the thickness is reduced to, for example, 1 μm, so that the substrate having the transparent conductive thin film is a plastic film substrate. It is especially effective in cases.

In the method for producing a color filter of the present invention, if the equilibrium concentration of the dispersion is less than 0.05 mmol / l, the dispersibility of the dispersed particles is reduced, and the dispersion is 0.15 mmol / l.
When the ratio exceeds 1 / l, in a thin film color filter of 1 μm or less, the adhesion to the electrode substrate is reduced, and a uniform filter cannot be obtained.

Here, the equilibrium concentration indicates the concentration of the surfactant not adsorbed on the dispersed particles in the micelle dispersion. This measurement is carried out after the preparation of the micelle dispersion, after a sufficient time has elapsed, after the adsorption of the surfactant to the dispersion particles has reached equilibrium, the dispersion particles are completely separated by centrifugation (1000 rpm or more), and Is determined by detecting the concentration of the surfactant present in the sample as the Fe content by an analytical method such as IPC.

The equilibrium concentration of the micelle dispersion is specified in JP-A-5-10397.
In the range where the equilibrium concentration is high, a sufficient effect was not recognized particularly in the case of a thin color filter having a thickness of 1 μm or less as in the present invention. The present invention is very effective when the color filter is a conductive color filter comprising dye particles and conductive particles, and when the substrate having the transparent conductive thin film is a plastic film base.

RG constituting color filter of the present invention
The micellar electrolysis method for forming the B dye film will be described. In the present micelle electrolysis method, a dispersion in which a dye having spectral characteristics of three primary colors is formed into micelles in an aqueous medium using a surfactant having a site which can be electrochemically oxidized and / or reduced.
(Micelle electrolyte), immersed the substrate having a transparent conductive thin film,
A color filter layer composed of a dye film is formed by applying a current. In particular, the present invention has a thickness of 1 μm
Hereinafter, it is effective for a thin film color filter having an average transmittance of 60% or more in visible light (380 to 780 mm).

First, the conductive substrate must be a metal or a conductor that is nobler than the oxidation-reduction potential of the surfactant used. In particular, when used for a liquid crystal cell, a transparent oxide semiconductor such as ITO is used. A form in which the thin film layer is formed on glass or a film is preferable, and in the present invention, a film in which an ITO thin film is formed on a plastic film substrate having a large adhesion effect is particularly effective.

As the transparent conductive thin film, In₂O₃,
SnO₂, ZnO, CdO, TiO ₂, In₂O₃, I
n₂O₃-Sn, SnO₂-Thin oxide semiconductor such as Sb
Film, metal thin film such as Au, Ag, Pt, TiN, ZrN
Any known conductive nitride thin film such as a thin film is used.
2 × 10^-4Ω · cm or less
Anti-visible and visible light transmittance of 80% or more are required, especially oxidation
ITO, zinc oxide, tin oxide, etc. are preferred
No. For its production method, for example, sputtering method,
Physics such as ion plating, vacuum deposition, and CVD
Chemical methods such as chemical method, printing method, coating method, chemical vapor deposition method
But not particularly limited to these methods.
No. As the thickness of the transparent conductive thin film, the viewpoint of resistance value and transparency
From 100 to 2000 ° is preferred.

The substrate (support) on which the transparent conductive thin film is formed is
In the LCD field, where optical properties are problematic, such as glass and plastic films, the glass substrate has surface flatness, and the film substrate has durability against a high-temperature atmosphere in the process of forming a transparent conductive film and the process of producing de-height. Heat resistance is required. Examples of the film substrate having the above-mentioned characteristics include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyether sulfone, polyimide, and polyarylate which have both heat resistance and optical flatness.

Next, examples of the pigments having the RGB spectral holding properties include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, metal-substituted phthalone anine pigments, and halogen polysubstituted phthalocyanine pigments. Examples thereof include inorganic pigments such as organic pigments, titanium oxide, iron oxide, cobalt violet, and cobalt blue, and these are used alone or in combination. Further, yellow pigments such as isoindolinone pigments and disazo pigments for adjusting chromaticity, and purple pigments such as dioxane pigments are used as necessary. The particle size of these pigments is preferably 10 μm or less, particularly preferably 1 μm or less.

In order to impart conductivity to the prepared dye layer, if necessary, transparent conductive particles such as ITO are added in addition to these dyes. However, when the amount of the conductive particles added is increased, the adhesion between the transparent conductive thin-film electrode and the dye layer is apt to decrease, but the effect is improved in the present invention.

Ferrocene derivative surfactants used for converting these hydrophobic substances into micelles have both a ferrocene site necessary for an electrolytic reaction and a nonionic, cationic, or anionic surface active site. 63-24329
8, JP-A-1-216894, JP-A-1-45370, JP-A-2-88387, JP-A-2-96585, JP-A-2-
250892, but is not limited thereto.

As the aqueous medium of the micelle electrolyte, water is mixed with an organic solvent such as alcohol or acetone, if necessary, and then used. In addition, a supporting electrolyte is added to the micelle electrolyte as needed in order to adjust the electric conductivity of the aqueous medium. As the supporting electrolyte, generally used ones such as sulfates, halides, acetates, and water-soluble oxides of alkali metals and alkaline earth metals are used.

In order to prepare a micelle electrolyte using the above-mentioned materials, a dye, a redox-reducible surfactant, and, if necessary, conductive particles and a supporting electrolyte are added to the aqueous medium.
The dispersion is uniformly dispersed or solubilized by a dispersion method such as a homogenizer, a three-roll mill, a sand mill, a pearl mill, or a stirrer. Here, the pigment concentration in the dispersion is 1 to 500.
g / l is preferred and the total surfactant concentration is 0.1 mmol
1 / l, and the equilibrium concentration is 0.05 to 0.1 as described above.
It is necessary to be 5 mol / l.

In order to prepare a dye thin film using the micelle electrolyte solution prepared as described above, a conductive substrate is immersed in the electrolyte solution and an electric current is applied. It is performed at a voltage higher than the potential and lower than the hydrogen generation potential. Specifically, 0.1 to 1.5 V, current density is 1
mA / cm ² or less is preferable, and it is performed by an electrolysis method such as constant potential and constant current. When electrolysis is performed under such conditions, a desired dye thin film is formed according to the principle of the micelle electrolysis method.

The thickness of the dye layer depends on the desired color characteristics of the color filter, but can be controlled to about 0.1 to 10 μm depending on the above-mentioned electrolysis conditions. However, in the past, when the film thickness was 1 μm or less, the adhesion between the transparent conductive thin film and the dye layer was particularly poor, and it was difficult to apply the film to a color filter for a reflective liquid crystal display, which was made thinner and focused on transmittance. . These problems have been improved by the present invention, and application to a color filter for a reflection type liquid crystal display has become possible.

After the formation of the thin film, if necessary, washing and drying may be performed to provide a protective layer. The protective layer is required to improve the mechanical strength of the dye layer and to act as a blocking layer between the dye layer and the liquid crystal layer. A transparent light-curable resist cured product such as a resin, an ester, a polyimito, a cyclized rubber, a siloxane, and an epoxy resin, and a cured transparent thermosetting resin are used.

Hereinafter, embodiments of the present invention will be described.

[0026]

EXAMPLES Production Example 1 (1) Preparation of red pigment dispersion liquid Ferrocene derivative surfactant I represented by the following formula (1)
8.20 parts by weight of DFE, 50.0 parts by weight of a red pigment (CI Pigment Red 177), and 1.05 parts by weight of lithium bromide monohydrate are added to 1000 parts by weight of pure water, mixed, and then used with an ultrasonic homogenizer. 1000 rp after dispersion
m to remove coarse particles. This dispersed and classified pigment dispersion is diluted with an IDFE aqueous solution containing 0.15% by weight of lithium bromide monohydrate, and a red pigment having a solid content of 2.0% by weight and an equilibrium concentration of IDFE of 100 μg / ml ( C. I Pigment Red 177 dispersion).

Ferrocene derivative surfactant IDFE9.
45 parts by weight of a yellow pigment (CI Pigment Yellow 8)
3) 50.0 parts by weight, lithium bromide monohydrate 11.05
The weight part was added to 1000 parts by weight of pure water, mixed and dispersed using an ultrasonic homogenizer, and then centrifuged at 1000 rpm to remove coarse particles. The dispersion-classified pigment dispersion was treated with I containing 0.105% by weight of lithium bromide monohydrate.
Diluted with DFE aqueous solution, solid content concentration 2.0% by weight, IDF
E was adjusted to be a dispersion of a yellow pigment (CI Pigment Yellow 83) having an equilibrium concentration of 100 µg / ml. 75 parts by weight of the above red pigment (CI Pigment Red 177) dispersion and the yellow pigment (CI Pigment Yellow 8)
3) A red pigment dispersion was prepared by mixing 25 parts by weight of the dispersion.

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(2) Preparation of Green Pigment Dispersion 8.00 parts by weight of a ferrocene derivative surfactant IDFE
50.0 parts by weight of a green pigment (CI Pigment Green 36) and 1.05 parts by weight of lithium bromide monohydrate were added to 10 parts of pure water.
The mixture was added to 00 parts by weight, mixed and dispersed using an ultrasonic homogenizer, and then centrifuged at 8000 rpm to remove coarse particles. This dispersed and classified pigment dispersion was diluted with an IDFE aqueous solution containing 0.105% by weight of lithium bromide monohydrate to obtain a green pigment (C) having a solid content of 2.0% by weight and an equilibrium concentration of IDFE of 100 μg / ml (C .I Pigment Green 36) It was adjusted to be a dispersion.

Ferrocene derivative surfactant IDFE9.
45 parts by weight of a yellow pigment (CI Pigment Yellow 8)
3) 50.0 parts by weight, lithium bromide monohydrate 11.05
The weight part was added to 1000 parts by weight of pure water, mixed and dispersed using an ultrasonic homogenizer, followed by centrifugation at 10,000 rpm to remove coarse particles. The dispersion-classified pigment dispersion was treated with I containing 0.105% by weight of lithium bromide monohydrate.
Diluted with DFE aqueous solution, solid content concentration 2.0% by weight, IDF
E was adjusted to be a dispersion of a yellow pigment (CI Pigment Yellow 83) having an equilibrium concentration of 100 µg / ml. 82.5 parts by weight of the dispersion of the green pigment (CI Pigment Green 36) and 17.5 parts by weight of the dispersion of the yellow pigment (CI Pigment Yellow 83) were mixed to prepare a green pigment dispersion. The equilibrium concentration of this green pigment dispersion is 100 μg
/ Ml.

(3) Preparation of blue pigment dispersion liquid Ferrocene derivative surfactant IDFE 10.80 parts by weight, blue pigment (CI pigment blue 15: 6) 5
0.0 parts by weight and 1.05 parts by weight of lithium bromide monohydrate were added to 1000 parts by weight of pure water, mixed, dispersed by using an ultrasonic homogenizer, and then centrifuged at 1000 rpm to remove coarse particles. The pigment dispersion obtained by dispersing and dispersing the pigment is used in 0.1.
IDF containing 105% by weight lithium bromide monohydrate
The mixture was diluted with an aqueous solution E to prepare a dispersion of a blue pigment (CI Pigment Blue 15: 6) having a solid content of 2.0% by weight and an equilibrium concentration of IDFE of 100 μg / ml.

(4) Preparation of Conductive Tin Oxide Dispersion Ferrocene Derivative Surfactant IDFE 16.6 parts by weight,
200 parts by weight of conductive tin oxide hydrophobized with isobutyltrimethoxysilane, lithium bromide monohydrate 1.05
The weight part was added to 1000 parts by weight of pure water, mixed, dispersed using an ultrasonic homogenizer, and then centrifuged at 3000 rpm to remove coarse particles. This dispersion-classified pigment dispersion was diluted with an IDFE aqueous solution containing 0.105% by weight of lithium bromide monohydrate, and the solid content concentration was 8.0% by weight.
It was adjusted to be a conductive tin oxide dispersion having an equilibrium concentration of DFE of 100 μg / ml.

Production Example 2 (1) Preparation of Red Pigment Dispersion Ferrocene Derivative Surfactant ID Represented by Formula (1)
8.20 parts by weight of FE, 50.0 parts by weight of red pigment (CI Pigment Red 177), lithium bromide monohydrate
05 parts by weight were added to 1000 parts by weight of pure water, mixed, dispersed using an ultrasonic homogenizer, and then centrifuged at 1000 rpm to remove coarse particles. This dispersed and classified pigment dispersion was diluted with an IDFE aqueous solution containing 0.15% by weight of lithium bromide monohydrate, and the solid content concentration was 2.0% by weight.
Red pigment having an average concentration of IDFEE of 70 μg / ml (C.I.
I Pigment Red 177 dispersion).

Ferrocene derivative surfactant IDFE9.
45 parts by weight of a yellow pigment (CI Pigment Yellow 8)
3) 50.0 parts by weight, lithium bromide monohydrate 11.05
The weight part was added to 1000 parts by weight of pure water, mixed and dispersed using an ultrasonic homogenizer, and then centrifuged at 1000 rpm to remove coarse particles. The dispersion-classified pigment dispersion was treated with I containing 0.105% by weight of lithium bromide monohydrate.
Diluted with DFE aqueous solution, solid content concentration 2.0% by weight, IDF
E was adjusted to be a dispersion of a yellow pigment (CI Pigment Yellow 83) having an equilibrium concentration of 70 μg / ml. 75 parts by weight of the above red pigment (CI Pigment Red 177) dispersion and the yellow pigment (CI Pigment Yellow 8)
3) A red pigment dispersion was prepared by mixing 25 parts by weight of the dispersion. The equilibrium concentration of this red pigment dispersion was 70 μg / ml.

(2) Preparation of Green Pigment Dispersion 8.00 parts by weight of a ferrocene derivative surfactant IDFE
50.0 parts by weight of a green pigment (CI Pigment Green 36) and 1.05 parts by weight of lithium bromide monohydrate were added to 10 parts of pure water.
The mixture was added to 00 parts by weight, mixed and dispersed using an ultrasonic homogenizer, and then centrifuged at 8000 rpm to remove coarse particles. This dispersed and classified pigment dispersion was diluted with an IDFE aqueous solution containing 0.105% by weight of lithium bromide monohydrate to obtain a green pigment (C) having a solid content of 2.0% by weight and an equilibrium concentration of IDFE of 100 μg / ml (C .I Pigment Green 36) It was adjusted to be a dispersion.

Ferrocene derivative surfactant IDFE9.
45 parts by weight of a yellow pigment (CI Pigment Yellow 8)
3) 50.0 parts by weight, lithium bromide monohydrate 11.05
The weight part was added to 1000 parts by weight of pure water, mixed, dispersed using an ultrasonic homogenizer, and then centrifuged at 1000 rpm to remove coarse particles. This dispersed and classified pigment dispersion was diluted with an IDFE aqueous solution containing 0.105% by weight of lithium bromide monohydrate, and the solid content concentration was 2.0% by weight.
The dispersion was adjusted to be a dispersion of a yellow pigment (CI Pigment Yellow 83) having an FE equilibrium concentration of 60 μg / ml. 82.5 parts by weight of the dispersion of the green pigment (CI Pigment Green 36) and 17.5 parts by weight of the dispersion of the yellow pigment (CI Pigment Yellow 83) were mixed to prepare a green pigment dispersion. The equilibrium concentration of this green pigment dispersion is 60 μg /
ml.

(3) Preparation of Blue Pigment Dispersion Ferrocene derivative surfactant IDFE 10.80 parts by weight, blue pigment (CI Pigment Blue 15: 6) 5
0.0 parts by weight and 1.05 parts by weight of lithium bromide monohydrate were added to 1000 parts by weight of pure water, mixed, dispersed by using an ultrasonic homogenizer, and then centrifuged at 1000 rpm to remove coarse particles. The pigment dispersion obtained by dispersing and dispersing the pigment is used in 0.1.
IDF containing 105% by weight lithium bromide monohydrate
The mixture was diluted with an aqueous solution E to prepare a dispersion of a blue pigment (CI Pigment Blue 15: 6) having a solid content of 2.0% by weight and an equilibrium concentration of IDFE of 50 μg / ml.

(4) Preparation of Conductive Tin Oxide Dispersion Ferrocene Derivative Surfactant IDFE 16.6 parts by weight,
200 parts by weight of conductive tin oxide hydrophobized with isobutyltrimethoxysilane, lithium bromide monohydrate 1.05
The weight part was added to 1000 parts by weight of pure water, mixed, dispersed using an ultrasonic homogenizer, and then centrifuged at 3000 rpm to remove coarse particles. This dispersion-classified pigment dispersion was diluted with an IDFE aqueous solution containing 0.105% by weight of lithium bromide monohydrate, and the solid content concentration was 8.0% by weight.
It was adjusted to be a conductive tin oxide dispersion having an equilibrium concentration of DFE of 50 μg / ml.

Example 1 A glass substrate on which a transparent conductive film was formed (manufactured by Geomatic Corporation)
Surface resistance: 20Ω / □, thickness: 1200 mm. Glass: # 7059 manufactured by Glass Konink Co., Ltd., pitch: 110 μm, width: 90
960 μm stripes were processed by the usual photolithography method. Next, in order to form an RGB color filter layer on the patterning electrode, a micelle electrolyte was prepared as follows.

(1) Red Micelle Electrolyte 30 parts by weight of the red pigment dispersion prepared in Production Example 1 and 20 parts by weight of the conductive tin oxide dispersion were mixed, and 0.105% by weight of lithium bromide monohydrate was mixed. The resulting solution was diluted with 50 parts by weight of an aqueous solution to prepare a red micelle electrolyte. The equilibrium concentration of the obtained micellar electrolyte was 50 μg / ml, that is, 0.054 m
mol / ml. (2) Green Micelle Electrolyte 30 parts by weight of the green pigment dispersion prepared in Production Example 1 and 27.75 parts by weight of the conductive tin oxide dispersion were mixed together to form 0.105% by weight of lithium bromide monohydrate. Containing IDFE 75μ
The solution was diluted with 42.25 parts by weight of a g / ml aqueous solution to prepare a green micelle electrolyte. The equilibrium concentration of the obtained micellar electrolyte was 89 μg / ml, that is, 0.096 mmol.
1 / ml. (3) Blue micelle electrolyte 18.75 parts by weight of the blue pigment dispersion prepared in Production Example 1 and 33.75 parts by weight of the conductive tin oxide dispersion were mixed, and the mixture was added in an amount of 0.1%.
IDFE containing 05% by weight of lithium bromide monohydrate
Diluted with 47.50 parts by weight of a 100 μg / ml aqueous solution,
A blue micelle electrolyte was prepared. The equilibrium concentration of the obtained micellar electrolyte was 100 μg / ml, that is, 0.1 g / ml.
08 mmol / ml.

After the transparent electrode was immersed in the red electrolyte solution thus prepared, 0.5%
V (vsAg / Agcl) at 1 mC / cm
² , and a red conductive color filter layer was formed on the selected electrode. This was taken out of the electrolytic solution, and visible light (380 to 7) before and after washing with pure water.
80 nm) average transmittance (Ref: substrate not containing a transparent conductive film) was measured. In the same manner, electrolysis is performed with a green electrolyte solution and a blue electrolyte solution, and visible light (3
(80-780 nm) The average transmittance was measured and is shown in Table 1.

Example 2 A transparent conductive thin film of transparent conductive film FST-5340 (Surface resistance 40 Ω / □, 1500 mm thick, manufactured by Sumitomo Bakelite Co., Ltd.) was prepared by a usual photolithography method at a pitch of 110 μm and a width of 9 mm.
It was processed into a 960 stripe pattern of 0 μm. Next, in order to form an RGB color filter layer on the patterning electrode, a micelle electrolyte was prepared as follows.

(1) Red Micelle Electrolyte 30 parts by weight of the red pigment dispersion prepared in Production Example 1 and 20 parts by weight of a conductive tin oxide dispersion were mixed, and 0.105% by weight of lithium bromide monohydrate was mixed. IDFE containing 140 μg /
The resulting solution was diluted with 50 parts by weight of a 50 ml aqueous solution to prepare a red micelle electrolyte. Incidentally, the equilibrium concentration of the obtained micellar electrolyte is
120 μg / ml, ie 0.129 mmol / ml
Met. (2) Green Micelle Electrolyte 30 parts by weight of the green pigment dispersion prepared in Production Example 1 and 27.75 parts by weight of the conductive tin oxide dispersion were mixed together to form 0.105% by weight of lithium bromide monohydrate. Containing IDFE170
The solution was diluted with 42.25 parts by weight of an aqueous solution of μg / ml to prepare a green micelle electrolyte. The equilibrium concentration of the obtained micellar electrolyte was 130 μg / ml, that is, 0.140 m / ml.
mol / ml. (3) Blue micelle electrolyte 18.75 parts by weight of the blue pigment dispersion prepared in Production Example 1 and 33.75 parts by weight of the conductive tin oxide dispersion were mixed, and the mixture was added in an amount of 0.1%.
IDFE containing 05% by weight of lithium bromide monohydrate
Diluted with 47.50 parts by weight of a 180 μg / ml aqueous solution,
A blue micelle electrolyte was prepared. The equilibrium concentration of the obtained micellar electrolyte was 138 μg / ml, ie, 0.1
It was 49 mmol / ml. Hereinafter, a color filter layer was formed and evaluated under the same electrolytic conditions.

Comparative Example 1 Example 1 was the same as Example 1 except that the following micelle electrolyte was used. (1) Red micellar electrolyte 30 parts by weight of the red pigment dispersion prepared in Production Example 1 and 20 parts by weight of the conductive tin oxide dispersion were mixed, and contained 0.105% by weight of lithium bromide monohydrate. IDFE 220 μg /
The resulting solution was diluted with 50 parts by weight of a 50 ml aqueous solution to prepare a red micelle electrolyte. Incidentally, the equilibrium concentration of the obtained micellar electrolyte is
160 μg / ml, ie 0.172 mmol / ml
Met. (2) Green Micelle Electrolyte 30 parts by weight of the green pigment dispersion prepared in Production Example 1 and 27.75 parts by weight of the conductive tin oxide dispersion were mixed together to form 0.105% by weight of lithium bromide monohydrate. Containing IDFE350
The solution was diluted with 42.25 parts by weight of an aqueous solution of μg / ml to prepare a green micelle electrolyte. The equilibrium concentration of the obtained micellar electrolyte was 206 μg / ml, that is, 0.222 m
mol / ml. (3) Blue micelle electrolyte 18.75 parts by weight of the blue pigment dispersion prepared in Production Example 1 and 33.75 parts by weight of the conductive tin oxide dispersion were mixed, and the mixture was added in an amount of 0.1%.
IDFE containing 05% by weight of lithium bromide monohydrate
Diluted with 47.50 parts by weight of a 300 μg / ml aqueous solution,
A blue micelle electrolyte was prepared. The equilibrium concentration of the obtained micellar electrolyte was 195 μg / ml, that is, 0.0
It was 32 mmol / ml.

Comparative Example 2 Example 2 was the same as Example 2, except that the following micelle electrolyte was used. (1) Red micelle electrolyte 30 parts by weight of the red pigment dispersion prepared in Production Example 2 and 20 parts by weight of a conductive tin oxide dispersion were mixed, and a 0.105% by weight aqueous solution of lithium bromide monohydrate 50 was mixed. The mixture was diluted with parts by weight to prepare a red micelle electrolyte. The equilibrium concentration of the obtained micellar electrolyte was 31 μg / ml, that is, 0.03 mm.
ol / ml. (2) Green micellar electrolyte 30 parts by weight of the green pigment dispersion prepared in Production Example 2 and 27.75 parts by weight of the conductive tin oxide dispersion were mixed together to form 0.105% by weight of lithium bromide monohydrate. The solution was diluted with 42.25 parts by weight of an aqueous solution to prepare a green micelle electrolyte. The equilibrium concentration of the obtained micellar electrolyte was 32 μg / ml, that is, 0.034 mmol / ml. (3) Blue micelle electrolyte 18.75 parts by weight of the blue pigment dispersion prepared in Production Example 2 and 33.75 parts by weight of the conductive tin oxide dispersion were mixed, and the mixture was mixed with 0.1 part by weight.
47.50% aqueous solution of lithium bromide monohydrate of 05% by weight
The mixture was diluted with parts by weight to prepare a blue micelle electrolyte. In addition,
The resulting micelle electrolyte had an equilibrium concentration of 30 μg / ml,
That is, it was 0.032 mmol / ml.

The results of the above Examples and Comparative Examples are shown in Table 1 below.

[Table 1] As can be seen from the above results, in the example, since the transmittance change before and after the washing process of the color filter after electrolysis is small, the adhesion between the electrode substrate and the color filter layer is improved, and the color filter layer does not fall off. Was.
On the other hand, in the comparative example, the adhesion of the color filter was poor even immediately after the electrolysis and before the cleaning, so that the adhesion amount was slightly lower and the transmittance was slightly higher under the same electrolysis conditions as in the example, and the color filter layer dropped off after the cleaning. Occurs, causing the transmittance to change.

[0046]

(1) Claims (1) and (3) Since the adhesion of the color filter to the electrode substrate by the micellar electrolysis method has been improved and the adhesion has been improved, the conductivity which is one of the causes of the decrease in the adhesion in the color filter. It can contain more particles, improves the conductivity of the color filter, is expected as a more stable liquid crystal drive electrode, and is effective for thin film color filters of 1 μm or less (visible light transmittance of 60% or more). In addition, it was possible to provide a color filter in which a micellar electrolytic color filter can be applied to a reflection LCD, and a method of manufacturing the color filter. 2. Claims 2 and 4 A color filter adhered to a flexible plastic substrate, which requires more adhesiveness than a glass substrate, with improved adhesion, and a method for producing the color filter can be provided.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Kondo 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Akihiko Kanemoto 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (4)

[Claims] 1. A dispersion obtained by micellizing a dye having spectral characteristics of three primary colors in an aqueous medium using a surfactant having a site capable of electrochemical oxidation and / or reduction,
A substrate having a transparent conductive thin film is immersed, and the equilibrium concentration of the surfactant in the micelle dispersion is set to 0.05 to 0.15 mmo.
A color filter which is obtained by conducting a current as 1 / l and has an average transmittance of 60% or more in visible light (380 to 780 nm). 2. The color filter according to claim 1, wherein the substrate having the conductive thin film is a plastic film substrate. 3. A dispersion obtained by micellizing a dye having spectral characteristics of three primary colors in an aqueous medium using a surfactant having a site capable of being electrochemically oxidized and / or reduced,
A substrate having a transparent conductive thin film is immersed, and the equilibrium concentration of the surfactant in the micelle dispersion is set to 0.05 to 0.15 mmo.
The visible light (3
A method for producing a color filter, wherein the average transmittance at 80 to 780 nm) is 60% or more. 4. The method according to claim 3, wherein the substrate having the conductive thin film is a plastic film substrate.