JP2003277689A - Coating material composition and substrate coated therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a coating material composition suitable for forming a thin film having decreased color shading caused by color interference and provide a coated substrate having low interference color shading by applying the composition to a substrate. <P>SOLUTION: The coating material composition is composed of a solid component and a solvent component. The solvent contains 5-90 pts.wt. of a low-boiling solvent having a boiling point of 40-100°C, 1-80 pts.wt. of a medium-boiling solvent having a boiling point of 100-150°C and 0.1-50 pts.wt. of a high-boiling solvent having a boiling point of ≥150°C based on 100 pts.wt. of the total solvent components. The coated substrate having decreased color shading by interference and especially useful as an antireflection substrate is produced by coating a surface of a substrate with the coating material composition to form a thin film on the surface. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coating composition suitable for thin film formation and a substrate coated with the coating composition.

[0002]

2. Description of the Related Art An antireflection substrate having an antireflection layer provided on the surface of a substrate such as transparent resin or glass is used as various optical components. Conventionally, an antireflection substrate having a two-layer structure in which a high refractive index layer and a low refractive index layer are sequentially laminated on the surface of the substrate, or a low refractive index layer is provided on the surface of the substrate 1
Layered structures are known. In the case of a two-layer antireflection film, the high refractive index layer is a layer having a refractive index higher than that of the base material, and the low refractive index layer is a layer having a refractive index lower than that of the high refractive index layer. . In the case of an antireflection film having a one-layer structure, the low refractive index layer is a layer having a refractive index smaller than that of the base material. The thickness of the high refractive index layer and the low refractive index layer is usually
Optical film thickness (n × n), which is the product of refractive index (n) and thickness (d)
In d), each is approximately 1/4 of the wavelength (λ) of visible light.
It is adjusted to be about (λ / 4) or 1/2 (λ / 2).

The substrate on which the antireflection film is formed is
Due to the difference in the refractive index of the antireflection film and the base material, the difference in the optical film thickness of the antireflection film, and the like, interference colors of blue to magenta to red may be observed by the reflected light. This phenomenon occurs because visible light has wavelength dependence when reflected by an antireflection substrate, and thus light in a wavelength region having a high reflectance appears strongly as reflected light.

Here, if the thickness of the antireflection film formed on the substrate is constant over the entire substrate, a certain interference color is produced,
It becomes an antireflection substrate with good appearance without color unevenness. But,
When anti-reflective paint is applied to the base material, drying from the paint,
In the process of curing, it is difficult to keep the film thickness on the base material completely uniform, and the interference color becomes non-uniform due to the non-uniformity of the film thickness, resulting in uneven color appearance. Become. Such a color unevenness phenomenon becomes a serious problem in display applications, particularly in applications such as projection televisions, plasma display panels, and front plates such as liquid crystal monitors having large base materials.

On the other hand, it is also widely practiced to apply a photocatalytic coating to the surface of a base material. In the case of photocatalytic coating, the film thickness of the photocatalytic layer is usually 1 μm or less, but color development due to light interference is observed, and if the coating film thickness on the substrate is uneven, it is observed as uneven color. Therefore, there is a problem in terms of appearance.

Examples of methods for reducing color unevenness include improving the coating method and adjusting the solvent volatilization rate in the drying step after applying the coating material to the substrate. In particular, a major cause of color unevenness is the non-uniformity of the solvent volatilization rate depending on the location on the substrate in the drying process. In order to keep the evaporation rate of the solvent constant, it is effective to lengthen the drying time of the solvent, and as a method therefor, generally, a low-boiling solvent is changed to a high-boiling solvent, the temperature of the drying zone is lowered, and the drying is performed. It is possible to extend the residence time in the furnace. However, changing the solvent to a high-boiling point solvent to slow down the drying speed requires a lot of time in the drying step, resulting in a decrease in productivity. The extension of the residence time in the drying furnace is accompanied by the problem of equipment cost and space. Moreover, since drying is usually performed at room temperature, lowering the temperature of the drying zone below room temperature is accompanied by an increase in equipment costs.

[0007]

Therefore, the object of the present invention is suitable for forming a thin film such as an antireflection film in which color unevenness due to interference color is reduced even when drying after coating is performed at room temperature. It is to provide a coating composition, and further to apply the composition to a substrate to form a coating film, thereby providing a coated substrate having less color unevenness due to interference color.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted earnest research with the objective as a result, and as a result, as a solvent component constituting a coating composition, at least three kinds having different boiling points are combined in an appropriate ratio. Therefore, it was found that the color unevenness due to the interference color can be reduced, and that the coated substrate obtained by applying this coating material to the substrate has little color unevenness due to the interference color and is useful as an antireflection material. Invented.

That is, the present invention is a coating composition consisting of a solid component and a solvent component, and when the total amount of the solvent component is 100 parts by weight, a low boiling point solvent having a boiling point of 40 ° C. or more and less than 100 ° C. is 5 to 90. Parts by weight, boiling point is 100 ° C or higher and 150 ° C
1 to 80 parts by weight of a medium boiling solvent of less than, and a boiling point of 150
The present invention provides a coating composition containing a high boiling point solvent having a temperature of not less than 0 ° C in a proportion of 0.1 to 50 parts by weight. This coating composition is effective for forming a thin film, and even a thin film can form a coating film with a uniform thickness. Further, according to the present invention, there is also provided a coated substrate obtained by applying the coating composition to the surface of the substrate to form a coating, and this substrate is particularly useful as an antireflection substrate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a solvent component in a coating composition is a low boiling point solvent having a boiling point of 40 ° C. or higher and lower than 100 ° C., a medium boiling point solvent having a boiling point of 100 ° C. or higher but lower than 150 ° C., and a boiling point of 150 ° C. At least three of the above high boiling point solvents are used. It is also possible to use two or more kinds of solvents in each boiling range. The boiling points mentioned here are values at 1 atm. When the total amount of the solvent is 100 parts by weight, the proportion of the low boiling point solvent is 5 to 90 parts by weight, the medium boiling point solvent is 1 to 80 parts by weight, and the high boiling point solvent is 0.1 to 50 parts by weight. To be

As described above, the low boiling point solvent has a boiling point of 40 ° C. to less than 100 ° C. at 1 atmosphere, and the medium boiling point solvent has a boiling point of 100 ° C. to less than 150 ° C. at 1 atmospheric pressure.
At least one high boiling point solvent having a boiling point of 150 ° C. or higher at 1 atm is used. The type of the solvent is not particularly limited as long as it is a solvent satisfying each boiling point range, but the solvent which falls within each boiling point range is exemplified below.

As the low boiling point solvent having a boiling point of 40 ° C. or more and less than 100 ° C. at 1 atm, for example, diethyl ether, ethyl formate, acetone, methyl acetate, methanol, trifluoroacetic acid, 2,2,2-trifluoroethanol. , Ethyl acetate, ethanol, methyl ethyl ketone, methyl propionate, propyl formate, 2-propanol, tert-
Butyl alcohol, isopropyl acetate, 1-propanol, isobutyl formate, ethyl propionate, 2-butanol and the like can be mentioned.

Examples of the medium-boiling point solvent having a boiling point of 100 ° C. or more and less than 150 ° C. at 1 atmosphere include water, n-propyl acetate, tert-pentyl alcohol, 3-pentanone, 2-
Pentanone, methyl butyrate, n-butyl formate, isobutanol, toluene, pentyl lactate, sec-butyl acetate, 3
-Pentanol, methyl isobutyl ketone, 1-butanol, isobutyl acetate, 2-pentanol, 1-methoxy-2-propanol, ethyl butyrate, 2-methoxyethanol (also known as methyl cellosolve), butyl acetate, 2-hexanone, 1- Chloro-2-propanol, 2-methyl-1-butanol, 2-chloroethanol, morpholine, mesityl oxide, n-amyl formate, isopentyl alcohol, 1-ethoxy-2-propanol, 2-
(Dimethylamino) ethanol, 2-ethoxyethanol (also known as ethyl cellosolve), ethylbenzene, ethylmorpholine, 1-pentanol, p-xylene, m-xylene, 2-isopropoxyethanol, isopentyl acetate, 4-heptanone, o-xylene. , 2-methoxyethyl acetate, methyl lactate, butyl propionate, methoxypropyl acetate, sec-hexyl acetate, pentyl acetate and the like. Among these medium boiling solvents, organic solvents are preferable, and a combination system of organic solvent and water is also effective.

As the high boiling point solvent having a boiling point of 150 ° C. or higher at 1 atm, for example, 2-heptanone, isopropylbenzene, ethyl lactate, 2-ethoxyethyl acetate,
Isopentyl propionate, furfural, 2- (diethylamino) ethanol, 2-ethylbutyl acetate, butyl butyrate, 2- (methoxymethoxy) ethanol,
Diisobutyl ketone, diacetone alcohol, furfuryl alcohol, 2-butoxyethanol (also called butyl cellosolve), 2-aminoethanol, methyl acetoacetate, 3-methoxybutyl acetate, cyclohexyl acetate, 1,3-dichloro-2-propanol, tetrahydrofuran Furyl alcohol, bis (2-chloroethyl) ether, ethyl acetoacetate, 2- (isopentyloxy) ethanol, isopentyl butyrate, butyl lactate,
Chloroacetic acid, dipropylene glycol monomethyl ether, acetonylacetone, 2-butoxyethyl acetate, diethylene glycol monomethyl ether, dichloroacetic acid, trichloroacetic acid, dipropylene glycol monoethyl ether, 2-ethylhexyl acetate, diethylene glycol monoethyl ether, methyl cyanoacetate, Ethyl cyanoacetate, 2- (hexyloxy) ethanol, o-chloroaniline, 3-chloro-1,2-propanediol, benzyl acetate, diethylene glycol monoethyl ether acetate, 3-hydroxypropiononitrile, methyl salicylate, diethylene glycol monobutyl ether. , Dipropylene glycol, tripropylene glycol monomethyl ether, 2-phenoxyethanol, di Ji glycol, diethylene glycol monobutyl ether acetate, triethylene glycol monomethyl ether, 2- (benzyloxy)
Examples thereof include ethanol, 2-phenoxyethyl acetate, N-phenylmorpholine, diethanolamine, 2,2'-thiodiethanol, triethylene glycol, triisopropanolamine, triethanolamine and the like.

The solid component in the coating composition of the present invention is
Any material can be used as long as it forms a film when the solvent is volatilized after coating. For example, vinylidene fluoride, tetrafluoroethylene, fluoroolefins such as hexafluoropropylene, other fluorocarbons, uncured or partially cured fluorosilicones or precursors thereof, uncured or partially cured Silicones or their precursors, uncured or partially cured siloxanes or their precursors, silane coupling agents, silica or its precursors, titanates or their precursors, boron siloxanes or their precursors, Saturated polyesters, epoxy compounds, rubber modified epoxy compounds, epoxy acrylates, urethanes, (meth) acrylates, fluorine-based (meth) acrylates, urethane (meth) acrylates, silicone (meth) acrylates, acrylic styrenes ,
Examples thereof include monomers such as celluloses, siliconates, phosphoric acid (meth) acrylates, phosphoric acid esters, metal (meth) acrylates, homopolymers thereof, and copolymers thereof. These are particularly effective for forming an antireflection film.

Further, styrene-acrylonitrile copolymers, polycarbonates, nylons, polyols, vinyl acetate resins, vinyl acetal resins, alkyd resins, polyether polyols, triacetyl cellulose, polyethylene terephthalate, polyesters, phenolic resins, polyester imides. , Polyamideimides,
Polyimides, aromatic resins, polyethylene, polypropylene, vinyl chloride resins, other vinyl resins, polystyrene, various resins such as polysulfides, calcium fluoride, barium fluoride, sodium silicate, aluminum phosphate, boron oxide Such inorganic binders can also be used.

Further, as a solid component, a conductive material such as titanium oxide (TiO ₂ ), zinc oxide (ZnO ₂ ), tin oxide (SnO ₂ ), strontium titanate (SrTiO ₃ ), tungsten oxide (WO ₃ ), Various photocatalytic materials such as bismuth oxide (Bi ₂ O ₃ ) and iron oxide (Fe ₂ O ₃ ), magnetic materials, inorganic salt compounds, and other inorganic materials may be contained.

These solid components can be used alone or as a mixture of two or more components.
In the present invention, since the purpose is particularly to form a thin film, it is preferable that the film-forming solid component has a concentration of about 0.1 to 20% by weight based on the entire coating composition. .

The coating composition may further contain an antioxidant, an ultraviolet absorber, a light stabilizer, a curing catalyst such as a photopolymerization initiator or a thermal polymerization initiator, a surfactant, and a water repellency, if necessary. Add additives such as an imparting agent, a defoaming agent, a flame retardant imparting agent, a plasticizer, a lubricant, a dye, a pigment, an antibacterial agent, a bactericidal agent, an insecticide, etc.
The components can be used alone or as a mixture of two or more components. The addition amount varies depending on the kind of the additive, but is usually 0.01 to 50% by weight based on the solid component.
It is a degree. Since these additives are not components that form a film after volatilizing the solvent by themselves,
A distinction is made from the film-forming solid components.

The coating composition can be applied to the substrate by a commonly used method, for example, a spray method, a dipping method, a roll coating method, a flow coating method, a gravure coating method or a spin coating method. At this time, it can be applied to both sides of the base material, or can be applied to one side. When applying to one side by the dipping method, for example, a surface not desired to be applied is sealed with a separate film or the like, immersed in a coating composition, and the seal is peeled off after completion of coating, or two substrates are not applied It is possible to adopt a method in which two substrates are separated by immersing in a coating composition in a state where they are overlapped with each other and the periphery is sealed, and the seal is peeled off after completion of coating.

If the obtained coating film is dried at room temperature, a coating film with less color unevenness can be formed. Here, the room temperature is usually in the range of 0 to 40 ° C, preferably 10 to 3
It is in the range of 5 ° C, and more preferably in the range of 20 to 30 ° C. However, depending on the solvent composition, the thin film-forming coating material of the present invention may show an effect of reducing color unevenness even at a drying temperature of room temperature or lower or room temperature or higher.

When the coating composition is dried at room temperature, the low boiling point solvent is 5 when the total amount of the solvent components is 100 parts by weight.
If the amount is less than the amount by weight, it takes a long time to dry in order to obtain a film without color unevenness, which is not good in terms of production efficiency. When the amount of the low boiling point solvent is more than 90 parts by weight, the drying speed at room temperature is high, so that the film is dried before the uniform film is formed by the leveling action, and the film becomes uneven in color. The low boiling point solvent is 10 parts by weight or more based on 100 parts by weight of the entire solvent component,
More preferably, the amount is 20 parts by weight or more, more preferably 80 parts by weight or less, and further preferably 60 parts by weight or less.

Further, when the amount of the medium boiling point solvent is less than 1 part by weight or more than 80 parts by weight when the total amount of the solvent components is 100 parts by weight, a film with uneven color tends to be formed. The medium boiling point solvent is 2 parts by weight or more, further 10 parts by weight or more, based on 100 parts by weight of the entire solvent component.
In particular, it is more preferably 20 parts by weight or more, 75 parts by weight or less, and further 70 parts by weight or less.

Furthermore, when the amount of the high boiling point solvent is less than 0.1 parts by weight or more than 50 parts by weight, when the total amount of the solvent components is 100 parts by weight, a coating film with uneven color tends to be formed. . The high boiling point solvent is more preferably 1 part by weight or more, further preferably 2 parts by weight or more, and 40 parts by weight or less, further 30 parts by weight or less with respect to 100 parts by weight of the entire solvent component. Is more preferable.

After coating, the coating is dried at room temperature, and then the coating is generally cured. This curing treatment involves curing at room temperature, depending on the properties of the coating, the durability of the substrate, and the physical properties to be exhibited. Ordinary curing methods such as heat curing, curing by irradiation with active energy rays, and curing by irradiation with active energy rays after drying by heating can be used.

The coating formed on the substrate may be a single layer or multiple layers depending on the function to be exerted. In the case of multiple layers, it is possible to apply a coating composition having the same components for each layer or a coating composition having a different composition. For example, in the case of obtaining a low reflection base material, one layer of an optical film having a low refractive index with respect to the base material may be formed, or a high refractive index with respect to the base material. It is also possible to form one layer of a film having an optical film thickness of, and further form a film having an optical film thickness lower than that of the high refractive index film. In addition, various multilayer structures are possible depending on the low reflection performance.

When this coating composition is applied to the surface of a substrate to form a film, and the film is a thin film having a thickness of 1 μm or less,
Especially in the case of a thin film having an optical film thickness of about λ / 4 or λ / 2,
Since the color development due to the interference color is strongly generated, the color unevenness reducing effect is excellent, but it is effective because the color unevenness reducing effect may be exhibited even when the film thickness is thicker than 1 μm.

The coating composition of the present invention is used for coating a substrate to form a film. As the base material, glass,
Inorganic substrates such as ceramics and metals, polymethylmethacrylate, copolymers having methylmethacrylate as a main constituent unit (the homopolymers of these methylmethacrylates or copolymers having a main constituent unit thereof are generally Acrylic resin or methacrylic resin), polystyrene, styrene-methyl methacrylate copolymer, styrene-acrylonitrile copolymer, polycarbonate, triacetyl cellulose, polyethylene terephthalate, plastic substrates such as cellulose acetate butyrate, inorganic and organic substances. It is possible to use the hybrid base material of.
The base material may contain additives such as an ultraviolet absorber, a light stabilizer, an antioxidant and a colorant. The shape of the substrate is not particularly limited, and normally, a film-shaped or sheet-shaped one is advantageously used, but a deformed shape such as a molded product can also be used. Although the thickness of the base material is not particularly limited, a base material having a thickness of about 0.01 to 50 mm is usually used.

It is also possible to bond a film-like material coated with the coating composition of the present invention to a substrate or a molded product and use it as an integrally molded product. As a molding method for laminating and integrating a film coated with the coating composition on a sheet-shaped substrate, for example, a method in which a film and a sheet-shaped substrate are separately prepared and continuously laminated between heating rolls Examples of the method include a method of thermocompression bonding with a press and a wet lamination method of laminating with an adhesive layer interposed. When the base material is thermoplastic, a method of simultaneously laminating under pressure or vacuum forming, a method of laminating another resin melt-extruded from a T die on a resin film on which a coating film has been formed in advance, and a film injection molding The method of inserting between the male and female molds and injecting the molten resin from one side of the mold to form an injection molded body and at the same time laminating the film to the molded body, preforming this film. From the mold and then inject the molten resin from one side of the mold to integrate with the film, after pre-molding this film in the injection mold, It is also possible to adopt a method of injecting a molten resin from the side to integrate it with the film.

As the substrate, it is possible to use a substrate having one or more undercoat films formed on at least a part of the surface. The method for forming the undercoat film is not particularly limited, and examples thereof include a spray method, a dipping method, a roll coating method, a flow coating method, a gravure coating method, a wet coating method such as a spin coating method, a vacuum deposition method, and a dry coating method such as sputtering. Law etc. can be used. The functions of the undercoat film include, for example, hard coat property, antistatic property, conductivity, high refractive index property, and adhesion improving property with a thin film film.

The coating film obtained by the present invention has antireflection property, photocatalytic property, water repellency, waterproof property, antifogging property, hydrophilic property, by appropriately selecting solid components and additives constituting the coating composition. Antistatic property, conductivity, electromagnetic wave shielding property,
Insulation, antifouling, non-slip, radio wave absorption, light reflection,
Retroreflective property, heat absorption property, heat shielding property, anti-adhesive property, non-adhesive property, chemical resistance, hard coat property, sweat resistance, cold resistance, soundproofing property, rustproof property, antivibration property, and UV deterioration prevention property. , Insecticidal properties, antibacterial properties, antifungal properties, magnetism, heat resistance, anti-condensation properties, and the like. Further, this coating can be applied to a protective material for a base material and an undercoat, or a top coat layer. Therefore, the base material on which the coating according to the present invention is formed is useful as a functional base material to which the above-mentioned function is imparted, for example, a front plate for a projection television,
Plasma display panel front plate, liquid crystal display front plate, a polarizing film disposed on the outermost surface of the liquid crystal display, various display members, optical lenses, optical films, eyeglass lenses, optical fiber clad material, It can be used as an optical component such as a light guide plate, a soundproof plate, a sign, a sign, a building material, an aquarium, an automobile instrument cover, a solar cell cover, a show window glass, and other protective covers.

[0032]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. In the examples,% and parts indicating the content or the amount used are based on weight unless otherwise specified.

Examples 1 to 3 and Comparative Examples 1 to 3 (A) Preparation of Substrate (A-1) Formation of Hard Coat Layer 17 parts of dipentaerythritol hexaacrylate,
3 parts of cyclohexyl acrylate, 2 parts of N-vinylpyrrolidone, 2-methyl-1- [4 as a polymerization initiator
2 parts of-(methylthio) phenyl] -2-morpholinopropan-1-one, methyl ethyl ketone 4 as a solvent
A composition containing 0 part and 36 parts of diacetone alcohol was used as a hard coat agent. Sumitomo Chemical Co., Ltd.
An acrylic resin plate "SUMIPEX E" having a thickness of 2 mm was dipped in the above hard coating agent and pulled up at a pulling rate of 50 cm / min for dipping coating. Next, it was dried at 40 ° C. for 10 minutes and then irradiated with ultraviolet rays to form hard coat layers on both surfaces of the acrylic resin plate. This hard coat layer has antistatic performance.

(A-2) Formation of High Refractive Index Layer Pentaerythritol triacrylate 1.0 part, tetraethoxysilane 0.1 part, average primary particle diameter 0.01 μm
1.7 parts of zirconium oxide particles, 0.2 part of 1-hydroxycyclohexyl phenyl ketone as a polymerization initiator, and 97 parts of isobutanol as a solvent were mixed to obtain a coating composition for a high refractive index layer. The acrylic resin plate having the hard coat layer obtained in (A-1) above was dipped in the coating composition for a high refractive index layer, and pulled up at a pulling rate of 40 cm / min to perform dipping coating. Next, it was dried at 40 ° C. for 10 minutes and then irradiated with ultraviolet rays to form a high refractive index layer having a thickness of about 80 nm on the hard coat layer. Thus, an acrylic resin plate having a hard coat layer and a high refractive index layer formed on both sides in this order was obtained, and this was used as a base material.

(B) Preparation of coating composition To tetramethoxysilane, the same weight of 0.1N hydrochloric acid (aqueous solution containing 0.1 mol of HCl per 1,000 cm ³ ) was added, and the solvent methanol was added thereto. Mix and further dilute by adding each solvent so that the solvent composition becomes the value shown in Table 1 for each example, the solid component concentration 1.
A coating composition having 2% and a solvent amount of 98.8% was prepared. In addition, in Table 1, the ratio of each component is shown with the total amount of the solvent being 100%.

[0036]

[Table 1]

(C) Coating and color unevenness evaluation Using the coating composition prepared in the above (B), a coating film was formed on the high refractive index layer of the substrate prepared in (A) by the dipping method, and further, An antireflection substrate was prepared by drying and curing and evaluated. Here, the following evaluation method was adopted as a condition for forcibly causing color unevenness by the dipping method. That is, a device for moving and stopping an object in the X-axis direction (vertical direction) at an accurate speed, which is a high-rigidity precision X-axis stage “Model CKR45-500X (Z)” manufactured by Sigma Optical Co., Ltd. ", And using the stage controller" MARK-21ED "to drive and control it,
The operations were performed in the following order, dipping coating was performed, color unevenness was evaluated, and the results are shown in Table 2. The thickness of the low refractive index layer formed in each example was about 100 nm.

Using the above apparatus, the substrate was lowered at a rate of 200 cm / min by the depping method, and the substrate was allowed to stand still for 10 seconds while being completely immersed. Next, pulling up at a pulling speed of 40 cm / min, and in order to make it easier to forcibly generate color unevenness at that time, every time it is pulled up by 5.68 mm, stop → pull → stop → pull… is repeated. Immediately after the dipping application, the horizontal lines are hung so that the stripes generated in the horizontal direction in the wet direction are in the vertical direction so that color unevenness is more likely to occur. In this state, after drying for 10 minutes at room temperature, 80 ℃
It is heated for 20 minutes to form a low refractive index layer, and its appearance is observed and evaluated according to the following criteria.

[0039] ⊚: No color unevenness is observed. B: Almost no color unevenness is observed. Δ: Color unevenness is slightly observed. X: Color unevenness is noticeable.

[0040]

[Table 2]

[0041]

According to the present invention, by combining at least three kinds of solvents having different boiling points with a specific composition, it is possible to obtain a coating composition capable of forming a coating film with little color unevenness even if it is a thin film. The base material having a coating formed from this coating composition is particularly useful as an antireflection base material.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2K009 AA05 AA15 BB02 BB06 BB13                       BB14 BB24 CC03 CC09 CC24                       CC26 CC33 CC34 CC35 CC38                       CC42 DD02 DD06 DD09                 4D075 BB92Z CA02 CB02 DA04                       DA06 DA23 DB01 DB13 DB14                       DB33 DB37 DB43 DB48 DC01                       DC11 DC24 EA06 EA21 EB13                       EB14 EB15 EB17 EB18 EB19                       EB22 EB32 EB33 EB35 EB36                       EB37 EB38 EB39 EB56 EC30                       EC52 EC54                 4J038 EA011 HA156 JA05 JA19                       JA20 JA26 JA27 JA33 JA34                       JA37 JA56 JA64 JA68 JA70                       JB06 JB09 JB39 KA06 NA19

Claims (5)

[Claims] 1. A coating composition comprising a solid component and a solvent component, wherein when the total amount of the solvent component is 100 parts by weight, a low boiling point solvent having a boiling point of 40 ° C. or more and less than 100 ° C. is 5 to 5.
90 parts by weight, 1 to 80 parts by weight of a medium boiling point solvent having a boiling point of 100 ° C. or higher and lower than 150 ° C., and 0.1 to 50 parts by weight of a high boiling point solvent having a boiling point of 150 ° C. or higher, Coating composition. 2. The coating composition according to claim 1, wherein the concentration of the solid component in the entire coating composition is 0.1 to 20% by weight. 3. A coated substrate, which is obtained by applying the coating composition according to claim 1 or 2 to the surface of the substrate to form a film. 4. The coated substrate according to claim 3, wherein the coating has a thickness of 1 μm or less. 5. The coated substrate according to claim 3, wherein the coating film is an antireflection film.