JP2002194290A - Method for preparing coating fluid for forming deep colored film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preparing a coating fluid for forming a deep colored film which can simply prepare a coating fluid for forming a deep colored film. SOLUTION: The method for preparing a coating fluid for forming a deep colored film containing coloring inorganic fine particles composed of at least any one of titanium oxide nitride, titanium nitride, carbon black, and iron oxide and having an average particle diameter of <=200 nm as the deep coloring component and insolation shielding inorganic particulates composed of particulates of antimony tin oxide and/or those of indium tin oxide and having an average particle diameter of <=200 nm as the insolation shielding component comprises mixing the coloring inorganic fine particles with the insolation shielding inorganic particulates and then dispersing the resulting mixture into a solvent and a binder. Since the coloring inorganic fine particles and the insolation shielding inorganic particulates are previously mixed and subsequently dispersed in the solvent and the binder, the above coating fluid can simply be prepared compared to the multi-pack mixing system including the conventional two-pack mixing system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating solution for forming a thick colored film for simultaneously providing privacy protection and solar shading to windows, telephone boxes and the like of vehicles, buildings, offices and general houses. In particular, the present invention relates to a method for producing a coating solution for forming a deeply colored film, which can simplify the production operation.

[0002]

2. Description of the Related Art Conventional coating solutions for forming a deeply colored film often use an organic dye as a deeply colored component. this is,
If organic dyes are used, they are rich in color and excellent in design,
This is because it can be used by dissolving it in an organic solvent, has excellent transparency, and has a strong hiding power per unit weight, so that it is possible to easily produce a film having a low transmittance, and the like. .

[0003] However, a dark-colored film formed by applying a conventional coating solution for forming a deep-colored film is intended only for privacy protection, and has a large absorption of visible light, but is close to sunlight. Low absorption in the infrared region,
Few efficiently shielded the thermal energy of the sun's rays.

[0004] Further, a deeply colored film to which an organic dye is applied is inferior in durability, and when used for a window glass or the like, discoloration or fading occurs in a relatively short period of time with changes in environmental conditions and lapse of time. There were drawbacks.

On the other hand, a coating solution for forming a deeply colored film using an inorganic pigment as a deeply colored component is also known. However, a film having a low hiding power per unit weight and a low visible light transmittance requires a large amount of pigment, resulting in an increase in cost and an excessively large film thickness, making it difficult to form a film. Due to the large particle size of the pigment, there was a drawback that the haze was high, the transparency was not obtained, and the glass became cloudy.

Under such a technical background, the present applicant has solved the above-mentioned conventional drawbacks, and has applied a coating solution for forming a deeply colored film capable of simultaneously providing both functions of protecting the privacy and shielding the sunlight as physical properties of the film. Has already been proposed.

That is, this coating solution for forming a deeply colored film is
Colored inorganic fine particles composed of at least one of titanium nitride oxide, titanium nitride, carbon black, and iron oxide having an average particle diameter of 200 nm or less as a deep coloring component, and antimony tin oxide fine particles and / or indium as a solar radiation shielding component Average particle size of 200 nm composed of tin oxide fine particles
It is characterized by containing the following solar shading inorganic fine particles (see Japanese Patent Application No. 2000-76325).

[0008]

By the way, the average particle size of at least one of titanium nitride oxide, titanium nitride, carbon black and iron oxide is used as a deeply colored component.
A coating solution for forming a deeply colored film, comprising colored inorganic fine particles having a diameter of not more than 00 nm and solar shielding inorganic fine particles having an average particle diameter of 200 nm or less composed of antimony tin oxide fine particles and / or indium tin oxide fine particles as a solar radiation shielding component. In the case of preparation, a colored inorganic fine particle dispersion in which colored inorganic fine particles are dispersed in advance, and a solar shading inorganic fine particle dispersion in which antimony tin oxide fine particles and the like are dispersed are separately prepared, and the dark colored film is formed. Immediately before the use of the coating solution, the dispersion is prepared by mixing the dispersion of the colored inorganic fine particles and the dispersion of the inorganic fine inorganic particles at a predetermined ratio (see Japanese Patent Application No. 2000-76325).

Therefore, since it is a multi-liquid mixed type of a colored inorganic fine particle dispersion and a solar shading inorganic fine particle dispersion, there is a problem that workability and productivity are inferior.

The reason why the multi-liquid mixing method is adopted is as follows.
Dispersion times of colored inorganic fine particles such as titanium nitride oxide, titanium nitride, and carbon black and inorganic solar shielding fine particles such as antimony tin oxide fine particles are different from each other.
When dispersed in a solvent and a binder in a state of being preliminarily mixed with a liquid and stored, it is considered that the dispersibility of these fine particles is impaired, and the coating solution for forming a deeply colored film is deteriorated with time and cannot be used in a short time. It was because it was.

The present invention has been made in view of such problems, and an object of the present invention is to provide a method for producing a coating solution for forming a solar shading film which can easily prepare the coating solution for forming a solar shading film. Is to provide.

[0012]

To solve the above-mentioned problems, the present inventors tried the following experiments.

First, colored inorganic fine particles such as titanium nitride oxide, titanium nitride, and carbon black and solar shading inorganic fine particles such as antimony tin oxide fine particles are mixed at a predetermined weight ratio, and these are dispersed and formed into ink. When a coating solution for forming a deeply colored film was prepared and the time-dependent change of the coating solution for forming a deeply colored film was examined, there was no particular problem with the dispersion stability of the colored inorganic fine particles and the solar shading inorganic fine particles contrary to the initial expectation. It was confirmed that.

The optical properties of the deeply colored film formed using the thus-prepared coating solution for forming a deeply colored film can simultaneously provide both functions of privacy protection and solar shading. It can be equivalent to a deeply colored film formed using a coating solution for forming a deeply colored film prepared by a multi-liquid mixture type such as a colored inorganic fine particle dispersion described in JP-A-76325 and a solar-shielding inorganic fine particle dispersion. confirmed.

The present invention has been completed through such technical confirmation.

That is, the invention according to claim 1 is characterized in that, as the deeply colored component, colored inorganic fine particles having an average particle diameter of not more than 200 nm, comprising at least one of titanium nitride oxide, titanium nitride, carbon black and iron oxide; Assuming a method for producing a coating solution for forming a deeply colored film containing, as a shielding component, solar radiation shielding inorganic fine particles having an average particle diameter of 200 nm or less composed of antimony tin oxide fine particles and / or indium tin oxide fine particles, After mixing the fine particles and the solar shading inorganic fine particles, they are dispersed in a solvent and a binder, and the invention according to claim 2 is characterized in that the coating liquid for forming a deeply colored film according to the invention according to claim 1 is used. Assuming the manufacturing method, the binder is any one of an inorganic binder, an electron beam curable resin, a thermosetting resin, and an ultraviolet curable resin. And it features.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below.

The colored inorganic fine particles of titanium nitride, titanium nitride, carbon black and iron oxide used as the coloring component in the present invention are superior in durability to organic dyes and have a hiding power similar to that of organic dyes. Are equivalent. Titanium nitride oxide and titanium nitride are deep purple, carbon black is black brown, iron oxide is reddish brown (eg, α-Fe ₂ O ₃ ), black (eg, Fe ₃ O ₄ ), and yellow (eg, FeOOH). is there.

Titanium oxynitride corresponds to TiN in which a part of N in N is replaced by O, and the molar ratio of Ti to N + O is 1:
It may deviate from 1 to about ± 20%. In addition, titanium nitride has a chemical formula represented by TiN,
And the molar ratio between N and N may deviate from 1: 1 to about ± 20%.

Iron oxide is typically α-Fe ₂
O ₃ , γ-Fe ₂ O ₃ , FeOOH, Fe _1-x O (x <0.
_{043), Fe ax O 4 (} 0.006 <x <0.104)
And the like.

In these colored inorganic materials, when fine particles having a particle size sufficiently smaller than the wavelength of visible light are dispersed in a matrix, visible light transmittance is generated, and the transmission colors of the respective films are titanium nitride oxide and titanium nitride. Blue-violet, carbon black is black-brown, and iron oxide is red-brown.

The average particle size of these colored inorganic fine particles is 20
The thickness is set to 0 nm or less, preferably 100 nm or less. 200
Fine particles having a size exceeding 200 nm or coarse particles aggregating to a size larger than 200 nm are not preferable because they serve as a light scattering source of the film after coating and cause clouding (haze) of the film or fail to obtain a clear color.

In general, a black color is preferred for a colored film for protecting privacy, but when a black color is to be obtained, titanium nitride oxide or titanium nitride, or carbon black or iron oxide is used. , A beautiful bluish black color can be obtained. In addition, since each has a high hiding power, the amount of fine particles used can be small. Furthermore,
By mixing these according to the purpose, it is possible to cope with various color tones. In particular, since yellow and reddish colors are not preferred in terms of design, titanium nitride oxide or titanium nitride, which has a high hiding power with a blue color that erases its color and has excellent durability, is effective for adjusting the color tone. is there.

Next, in the present invention, fine particles of antimony tin oxide or fine particles of indium tin oxide are used as a material for efficiently shielding near infrared rays of sunlight. The near-infrared absorption efficiency of the indium tin oxide fine particles is better in terms of carrier concentration and mobility. However, since indium tin oxide fine particles are more expensive than antimony tin oxide fine particles, it is preferable to use both fine particles properly according to the purpose.

The indium tin oxide fine particles used in the present invention have an L ^* a ^* b ^* color system (JIS Z 872) standardized by the International Commission on Illumination (CIE) from the viewpoint of optical characteristics.
Powder color L ^* in 9) is 30 to 80, a ^* is -10 to-
0.1 and b ^* of -15 to -1 are preferred.

The tin content of the indium tin oxide fine particles in terms of element is preferably 1 to 15% by weight. 1% by weight
If the amount is less than 15%, the effect of adding tin is not seen, while if it exceeds 15% by weight, the solid solution of tin becomes insufficient. The antimony content of the antimony tin oxide fine particles in terms of element is preferably 1 to 10% by weight. The average particle diameter of the indium tin oxide fine particles or the antimony tin oxide fine particles is 200 nm or less, preferably 10 nm or less.
0 nm or less. If the thickness exceeds 200 nm, the film becomes a light scattering source, causing fogging (haze) in the film and causing a decrease in visible light transmittance, which is not preferable. Here, the size of the particles is represented by the average particle size, but in particular, fine particles having a small ratio of coarse powder exceeding 100 nm and a narrow particle size distribution are preferable, and the lowest particle size that is economically available. Is 2
Although it is a fine particle of about nm, the lower limit of the particle diameter is not limited to this.

Further, the present invention provides a colored inorganic fine particle composed of at least one of titanium nitride oxide, titanium nitride, carbon black and iron oxide having an average particle diameter of 200 nm or less as a deeply colored component, Preparation of a coating solution for forming a deep colored film by mixing with sun-shielding inorganic fine particles having an average particle diameter of 200 nm or less composed of antimony tin oxide fine particles and / or indium tin oxide fine particles, and then dispersing in a solvent and a binder. It is characterized by.

The method of mixing the colored inorganic fine particles and the solar shading inorganic fine particles is not particularly limited as long as these fine particles can be uniformly mixed, and a known mixing method can be employed.

Next, the solvent in which the homogeneous mixture of the colored inorganic fine particles and the solar shading inorganic fine particles are dispersed is not particularly limited, and is appropriately selected according to the coating conditions, the coating environment, and the binder used together. . For example, water, ethanol, propanol, butanol, isopropyl alcohol, isobutyl alcohol, alcohols such as diacetone alcohol, methyl ether, ethyl ether,
Various organic solvents such as ethers such as propyl ether, esters, ketones such as acetone, methyl ethyl ketone, diethyl ketone, cyclohexane and isobutyl ketone can be used, and if necessary, acid or alkali substances are added to adjust pH. May be. Further, it is of course possible to add various surfactants, coupling agents and the like in order to further improve the dispersion stability of the fine particles in the coating solution for forming a deeply colored film.

The type of the binder is not particularly limited, but may be a metal alkoxide of silicon, zirconium, titanium, or aluminum or a partially hydrolyzed polycondensate thereof, or an inorganic binder such as organosilazane, or an acrylic binder. Resin binders such as thermoplastic resins such as resins, thermosetting resins such as epoxy resins, ultraviolet curable resins, electron beam curable resins, and room temperature curable resins can be used.

The method of dispersing the homogeneous mixture of the colored inorganic fine particles and the solar shading inorganic fine particles in the above-mentioned solvent is not particularly limited as long as it can be uniformly dispersed in the coating solution. Sand mills, paint shakers, ultrasonic homogenizers and the like can be mentioned.

As the transparent substrate to which the coating solution for forming a deeply colored film according to the present invention is applied, a plate-like, sheet-like, film-like plastic resin or glass is applied. Generally, it is suitable to use a transparent resin which is transparent and has little scattering. For example, polycarbonate, poly (meth)
Acrylic ester-based, cyclic olefin-based, saturated polyester-based resins, polystyrene, polyvinyl chloride, polyvinyl acetate, and the like can be used.

The surface of these transparent resin films is
It is preferable that a surface treatment for improving the binding property with the resin binder is performed. Typical surface treatment methods include well-known corona treatment, plasma treatment, flame treatment, primer layer coating treatment, and the like.

When these transparent resin films are used in applications where design is important, it is also possible to use base materials that have been previously molded. In addition, in order to attach these resin films to glass or the like, a laminate of an adhesive and a release film on one surface may be used.
Also, by adding an ultraviolet shielding agent to this adhesive,
It is also possible to prevent the deterioration of the film or coating film by ultraviolet rays. Examples of the ultraviolet shielding agent include benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, and fine particles of inorganic titanium oxide, zinc oxide, cerium oxide, and the like.

Further, a hard coat layer may be applied to the outermost layer of the transparent resin film, or relatively hard by heating with a drier or the like so as to be conveniently attached to a surface like a back window of an automobile. It is also possible to use films which soften easily.

As a binder for forming a coating film on a transparent resin film, an ultraviolet curable resin is well known, and has already been described as a binder component of the coating solution for forming a deeply colored film according to the present invention. . The typical composition is mainly composed of a mixture of a photopolymerizable oligomer such as epoxy acrylate, urethane acrylate, polyester acrylate, and polyether acrylate, and a photopolymerizable monomer such as monofunctional acrylate and polyfunctional acrylate. , Acetophenone-based, thioxanthone-based, and peroxide-based photoinitiators, and amine-based and quinone-based photoinitiating aids can be used. Further, a thermal polymerization inhibitor, an adhesion-imparting agent, a thixo-imparting agent, a plasticizer, a non-reactive polymer, and a colorant may be added.

The dark-colored film formed by the coating solution for forming a deep-colored film according to the present invention comprises a colored inorganic fine particle as a deep-colored component and a solar-shielding inorganic fine particle as a sun-shielded component on the transparent substrate. Are deposited at a high density to form a film. The binder contained in the coating solution for forming a deeply colored film improves the adhesion of the colored inorganic fine particles and the solar shading inorganic fine particles to the transparent substrate after coating and curing. If necessary, SiO ₂ , TiO ₂ Addition of fine particles such as ZrO ₂ , Al ₂ O ₃ , and MgO to the coating solution has the effect of further increasing the hardness of the film without lowering the visible light transmittance. At this time, SiO ₂ , TiO ₂ , ZrO ₂ , Al ₂ O ₃ , MgO
The particle size of the fine particles is preferably 200 nm or less, and more preferably 100 nm or less. As these fine particles, a colloid sol of 200 nm or less prepared by a wet method can be used.

Here, the method of applying the above-mentioned coating solution for forming a deeply colored film is not particularly limited. For example, spin coating, bar coating, spray coating, dip coating, screen printing, roll coating, flow coating, etc., as long as the method can apply a coating solution for forming a deeply colored film flat and thinly and uniformly. Method may be used.

Next, when the above resin binder is applied as the binder, the resin may be cured according to the respective curing method. For example, in the case of an ultraviolet curing resin, an ultraviolet lamp may be selected according to the resonance wavelength of each photoinitiator or the desired curing speed. Representative lamps include low-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, pulsed xenon lamps,
An electrodeless discharge lamp and the like can be mentioned. In the case of an electron beam-curable resin binder that does not use a photoinitiator, it may be cured using an electron beam irradiation device such as a scanning type or an electron curtain type. Further, if it is a heat-curable resin, it may be heated at a target temperature.

In the dark-colored film formed by the coating solution for forming a deep-colored film according to the present invention, the above-mentioned colored inorganic fine particles and solar-shielding inorganic fine particles are dispersed in the film. For this reason, compared to a film having a mirror-like surface in which crystals are densely filled in the film, such as an oxide thin film formed by a physical film formation method, there is less reflection in the visible light region, and a glaring appearance is exhibited. That can be avoided. When it is desired to further suppress the reflection in the visible light region, a luminous reflectance of 1% or less can be easily obtained by forming a low refractive index film such as SiO ₂ or MgF ₂ on the fine particle dispersion film. Can be obtained.

As described above, according to the method for producing a coating solution for forming a deeply colored film according to the present invention, an average of at least one of titanium nitride oxide, titanium nitride, carbon black and iron oxide is used as the deeply colored component. After mixing the colored inorganic fine particles having a particle diameter of 200 nm or less and the solar light shielding inorganic fine particles having an average particle diameter of 200 nm or less composed of antimony tin oxide fine particles and / or indium tin oxide fine particles as a solar light shielding component, the mixture is mixed with a solvent and a binder. In addition to the conventional method of producing a coating solution for forming a deeply colored film by a multi-liquid mixing method such as a two-liquid method, the production work of the coating solution for forming a deeply colored film can be simplified, and Further, it is possible to form a highly colored film exhibiting both effects of privacy protection and solar shading at high efficiency and at low cost.

Further, since the above-mentioned fine particles are inorganic materials, they have extremely high weather resistance as compared with organic materials. For example, even when they are used in a portion exposed to sunlight (ultraviolet rays), their color and various functions are hardly deteriorated. Has no effect.

[0043]

Embodiments of the present invention will be specifically described below. However, the present invention is not limited to the following examples.

Further, the visible light transmittance and the solar transmittance of the dark colored films obtained in each of Examples and Comparative Examples were measured using a spectrophotometer U-4000 manufactured by Hitachi, Ltd.
Further, the haze value is HR- manufactured by Murakami Color Research Laboratory Co., Ltd.
It was measured using a 200.

Further, the durability of the deeply colored films obtained in each of Examples and Comparative Examples was measured using a super UV tester [SUV-F2 manufactured by Iwasaki Electric Co., Ltd.]. For the measurement sample, the four corners of the film were affixed to a 2 mm thick transparent plate glass, and the glass surface was set to the UV irradiation lamp side.
Continuous irradiation for 150 hours (black panel temperature 60 ° C, illuminance 100mW / cm ² , without shower and filter,
The change in color after an irradiation distance of 240 mm) was visually observed.

Example 1 Antimony content: 8% by weight
Mixing ratios of antimony tin oxide fine particles having an average particle diameter of 0.05 μm, titanium nitride oxide fine particles having an average particle diameter of 0.058 μm, and carbon black having an average particle diameter of 0.013 μm are 85.2: 11 by weight ratio. 0.0: 3.8
And mixed for 30 minutes.

Next, 29.33% by weight of the above mixed fine particles,
61.01% by weight of toluene, 9.66% by weight of a dispersant, and 0.3 mm zirconia beads equivalent to a filling rate of 63% were dispersed by a paint shaker for 24 hours.

Next, 70% by weight of this dispersion and 30% by weight of a UV-curable resin UV3701 for hard coating (a nonvolatile content of 99% or more) manufactured by Toa Gosei Chemical Co., Ltd. as a binder resin.
A coating solution for forming a deeply colored film according to Example 1 was prepared, and the coating solution for forming a deeply colored film was prepared using a bar coater, N
o. 3, No. 6, no. After applying to a 50 μm thick PET film (EPE-50 manufactured by Teijin) in step 8,
Dried at 100 ° C. for 30 seconds.

Next, ultraviolet irradiation was performed using a high-pressure mercury lamp to obtain a deeply colored cured film a according to Example 1. FIG. 1 shows the evaluation results of the deep colored cured film a.

Example 2 Antimony Tin Oxide Fine Particles
Instead of the combination of titanium nitride oxide fine particles and carbon black, the above antimony tin oxide fine particles, titanium nitride having an average particle size of 0.022 μm, and an average particle size of 0.05 μm
m, and the mixing ratio thereof is 81.6: 10.5: 7.9 by weight, and the bar coater, No. Example 1 except that No. 6 was applied
In the same manner as in Example 1, a dark colored cured film b according to Example 2 was obtained. Visible light transmittance (%), solar transmittance (%), haze value (%), and durability of the dark-colored cured film b (Δ is good)
Is shown in Table 1.

Example 3 Antimony Tin Oxide Fine Particles
Instead of the combination of titanium nitride oxide fine particles and carbon black, the above antimony tin oxide fine particles, titanium nitride having an average particle size of 0.022 μm, and an average particle size of 0.05 μm
m, and the mixing ratio thereof is 82.7: 10.6: 6.7 by weight, and a bar coater, No. Example 1 except that No. 6 was applied
In the same manner as in the above, a deep colored cured film c according to Example 3 was obtained. Visible light transmittance (%), insolation transmittance (%), haze value (%), and durability of this dark-colored cured film c (Δ is good)
Is shown in Table 1.

Example 4 Antimony Tin Oxide Fine Particles
Instead of the combination of titanium nitride oxide fine particles and carbon black, a combination of indium tin oxide fine particles, the above-mentioned titanium nitride oxide fine particles and carbon black is applied, and the mixing ratio of these is 77.9: 1
6.5: 5.6 and a bar coater, no. 6
Was applied in the same manner as in Example 1 to obtain a dark colored cured film d according to Example 4. Table 1 shows the visible light transmittance (%), the solar transmittance (%), the haze value (%), and the durability (Δ is good) of the dark colored cured film d.

Comparative Example 1 87 g of toluene and 3 g of a dispersant (silicone coupling agent manufactured by Adeka Co.) were mixed with stirring, and 10 g of titanium nitride oxide fine particles were added thereto, followed by further stirring. This liquid was subjected to a dispersion treatment involving strong disintegration energy to prepare a dispersion liquid (A liquid) of colored inorganic fine particles having an average dispersed particle diameter of 100 nm or less.

Similarly, 86 g of toluene and 4 g of a dispersant (silicone coupling agent manufactured by Adeka Co.) were stirred and mixed, and 10 g of carbon black fine particles were added thereto, followed by further stirring. This liquid was subjected to a dispersion treatment involving strong crushing energy to prepare a colored inorganic fine particle dispersion liquid (liquid B) having an average dispersed particle diameter of 100 nm or less.

Similarly, 60 g of toluene and 10 g of a dispersant (silicone coupling agent manufactured by Adeka Co.) were stirred and mixed.
30 g of antimony tin oxide fine particles were added thereto and further stirred. This liquid was subjected to a dispersion treatment involving strong disintegration energy to prepare a solar-shielding inorganic fine particle dispersion liquid (liquid C) having an average dispersed particle diameter of 100 nm or less.

Next, using the liquids A, B, and C, the mixing ratio of the antimony tin oxide fine particles in the liquid C, the titanium nitride oxide fine particles in the liquid A, and the carbon black fine particles in the liquid B was changed by weight. After sufficiently mixing so that the ratios become 85.2: 11.0: 3.8, respectively, an ultraviolet curing resin UV370 for hard coat manufactured by Toa Gosei Chemical Co., Ltd. was used as a binder resin.
1 (99% or more nonvolatile content) to prepare a coating solution for forming a deeply colored film according to Comparative Example 1 having the same composition as in Example 1.

This coating solution for forming a deeply colored film was coated with a bar coater, 3, No. 6, no. 8 and 50 each
After coating on a μm PET film (EPE-50 manufactured by Teijin), the film was dried at 100 ° C. for 30 seconds, and then irradiated with ultraviolet rays using a high-pressure mercury lamp to obtain a deeply colored cured film according to Comparative Example 1.

FIG. 1 also shows the evaluation results of this deeply colored cured film.

[0059]

[Table 1] As is clear from the results shown in FIG.
The dark colored cured film according to No. 4 has almost the same characteristics as the dark colored cured film according to Comparative Example 1 in all evaluations such as optical characteristics and durability, and is a film having both functions of privacy protection and solar shading. Can be confirmed.

[0060]

According to the method for producing a coating solution for forming a deeply colored film according to the invention of claims 1 and 2,
Average particle diameter of at least 200 nm comprising at least one of titanium nitride oxide, titanium nitride, carbon black and iron oxide
The following colored inorganic fine particles and, as a solar shading component, solar shading inorganic fine particles having an average particle diameter of 200 nm or less composed of antimony tin oxide fine particles and / or indium tin oxide fine particles are mixed, and then dispersed in a solvent and a binder. As compared with the conventional method for producing a coating solution for forming a deep colored film by a two-liquid mixing method such as two-liquid, the production of the coating solution for forming a deeply colored film can be simplified and privacy protection can be improved. It becomes possible to form a highly colored film exhibiting both effects of shielding sunlight, with high efficiency and at low cost.

[Brief description of the drawings]

FIG. 1 is a graph showing optical characteristics of a deeply colored cured film according to Example 1 and Comparative Example 1.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H042 AA08 AA15 AA33 2K009 BB24 CC01 CC02 CC03 CC21 DD02 EE01 4J038 FA111 FA251 FA261 FA271 FA281 HA026 HA216 HA316 KA06 KA08 NA19 PA17 PB05 PB07 PC03 PC08

Claims (2)

[Claims] 1. A colored inorganic fine particle having an average particle diameter of 200 nm or less comprising at least one of titanium nitride oxide, titanium nitride, carbon black and iron oxide as a deeply colored component, and antimony tin oxide as a solar shading component. In the method for producing a coating solution for forming a deeply colored film containing fine particles and / or solar-shielding inorganic fine particles having an average particle diameter of 200 nm or less composed of indium tin oxide fine particles, the above-mentioned colored inorganic fine particles and solar-shielding inorganic fine particles are mixed. And then dispersing the mixture in a solvent and a binder. 2. The method according to claim 1, wherein the binder is one of an inorganic binder, an electron beam curable resin, a thermosetting resin, and an ultraviolet curable resin.