JP2002121481A - Coating material composition and article coated with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating material composition which can develop a stain- proof property on an organic substrate or on a coating film prepared by applying an organic coating on the surface of the organic substrate without peeling over a long period. SOLUTION: This coating material composition comprising the following components (A) and (B) in a (A):(B) solid weight ratio of 9:1 to 5:5 and in a (A), (B) total solid content of 5 to 0.05 wt.%. The component (A) is a tetrafunctional silicone resin which is obtained by partially hydrolyzing a silicone compound represented by the general formula: Si(OR) and has a weight-average mol.wt. of 500 to 3,000 converted into polystyrene, and the component (B) is an optical semiconductor coated with silica.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coating film applied to an organic base material or a base material having an organic coating applied to the surface thereof.
The present invention relates to a coating material composition capable of exhibiting transparency and antifouling property, and a coated product thereof.

[0002]

2. Description of the Related Art A coating material composition containing an optical semiconductor in an inorganic paint containing a silicone range as a main component is applied to the surface of a substrate and cured to form the optical semiconductor in a silicone range cured product. What formed the coating film containing is known.

[0003] The above-mentioned optical semiconductor generates active oxygen when irradiated with ultraviolet rays, and is capable of oxidatively decomposing organic substances by the action of the active oxygen. Therefore, the coating film formed by applying the coating material composition containing the optical semiconductor, by irradiating ultraviolet rays, adhered to the surface, for example, carbon fraction and tobacco contained in the exhaust gas of automobiles Self-cleaning effect to decompose dirt components such as tar, deodorizing effect to decompose malodorous components such as amine compounds and aldehyde compounds, and antibacterial effect to prevent the generation of bacterial components such as Escherichia coli and Staphylococcus aureus. It is expected to exhibit a mold effect and the like. In addition, the coating film decomposes and removes organic substances that repel water by the photocatalytic action of the optical semiconductor, thereby reducing the contact angle of water with respect to the surface of the coating film,
The effect of improving the hydrophilic property, that is, being easy to get wet with water, is obtained. From the effect of improving the hydrophilicity, an antifouling effect in which attached dirt flows by rainwater is expected. In addition, the coating film also exhibits antifouling properties because it also exhibits an antistatic function by the photocatalysis of the optical semiconductor.

[0004] As described above, the coating film containing the optical semiconductor is expected to have various effects. In particular, the coating film is formed on a general-purpose member used outdoors and is used for antifouling applications. The use of is desired.

[0005]

Since the above-mentioned optical semiconductor has a function of decomposing organic substances, when it is applied to an organic base material, there arises a problem that it peels off with the passage of time. Therefore, when applying a coating material composition containing such an optical semiconductor to an organic base material, a first primer layer was formed with an organic paint, and a second primer layer was formed thereon with an inorganic paint. Many man-hours are required for forming a coating film, such as forming a coating film composed of the coating material composition on the surface. Therefore, there is a need for a coating material composition containing an optical semiconductor that can be applied to an organic substrate or a substrate having an organic coating applied to the surface.

[0006] Further, titanium oxide itself, which is an optical semiconductor, is a white powder, and the appearance of a coated product tends to be white, and the appearance of the coated product may be limited. Therefore, a coating material composition containing an optical semiconductor having transparency is required.

The present invention has been made in view of the above circumstances, and has as its object to peel off a coating film applied to an organic base material or a base material having a surface coated with an organic coating material over a long period of time. An object of the present invention is to provide a coating material composition capable of exhibiting antifouling property without performing the coating, and a coated product thereof.

[0008] Another object of the present invention is to provide a coating which can exhibit transparency and antifouling properties when applied to an organic base material or a base material having a surface coated with an organic coating material. To provide goods.

[0009]

Means for Solving the Problems The applicant of the present application has conducted intensive studies in order to achieve the above object, and as a result, using a four-functional silicone resin and a specific optical semiconductor, these compounds are mixed at a specific compounding ratio. The coating material composition was applied to an organic base material or a substrate coated with an organic coating material on the surface, without peeling over a long period of time, and found to exhibit transparency and antifouling properties. The present invention has been completed.

[0010] In the present invention, the coating film exhibiting antifouling property means that 0.2 cc of distilled water is dropped on the surface of the film.
Observation with a magnifying camera means that the contact angle of water is 40 degrees or less.

[0011] The coating material composition according to claim 1 is
The following components (A) and (B) are used as constituent materials, and the compounding weight ratio of the components (A) and (B) is calculated as solid content (A):
(B) = 9: 1 to 5: 5, and the total solid content of the component (A) and the component (B) relative to the total amount of the composition is 5
% By weight or less and 0.05% by weight or more. Component (A); a silicon compound represented by the general formula Si (OR) ₄ (1) (wherein R represents the same or different monovalent hydrocarbon group) is partially hydrolyzed to obtain a polystyrene having a weight average molecular weight of polystyrene. A tetrafunctional silicone resin prepared to a conversion of 500 to 3000, (B) component: an optical semiconductor coated with silica.

[0012] The coating material composition according to claim 2 is
The coating material composition according to claim 1, wherein the component (B) has an average primary particle diameter of 5 to 50 nm.

[0013] The coating material composition according to claim 3 is
The coating material composition according to claim 1 or 2, wherein the optical semiconductor of the component (B) is an anatase type titanium oxide.

[0014] The coated article according to claim 4 is provided on the surface of the substrate,
A coating film is formed by applying the coating material composition according to any one of claims 1 to 3.

According to a fifth aspect of the present invention, there is provided the coated product according to the fourth aspect, wherein the thickness of the coating film is 0.1 to 1 μm.

According to a sixth aspect of the present invention, there is provided the coated article according to the fourth or fifth aspect, wherein the base material is an organic base material.

According to a seventh aspect of the present invention, in the coated product according to the sixth aspect, the material of the organic base material is a polycarbonate resin or an acrylic resin.

According to an eighth aspect of the present invention, there is provided the coated article according to any one of the fourth to seventh aspects, wherein the base material has an organic coating applied to the surface.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The coating material composition of the present invention has a weight average molecular weight of 500 to 3,000 in terms of polystyrene by partially hydrolyzing a silicon compound represented by the above general formula (1) as component (A). The prepared 4-functional silicone resin is used as an essential constituent material. The component (A) is used as a binder resin and a film-forming component.

The silicon compound is represented by the general formula (1). R in the general formula (1) represents the same or different monovalent hydrocarbon group, and among them, from the viewpoints of availability, ease of preparation of paint, etc., 1 to 1 carbon atoms. Monovalent hydrocarbon groups are suitable. Examples of the monovalent hydrocarbon group include an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group and an octyl group; and a cycloalkyl group such as a cyclopentyl group and a cyclohexyl group. An aralkyl group such as a 2-phenylethyl group and a 3-phenylpropyl group; an aryl group such as a phenyl group and a tolyl group; an anenyl group such as a vinyl group and an allyl group;
Chloromethyl group, γ-chloropropyl group, 3,3,3-
A halogen-substituted hydrocarbon group such as a trifluoropropyl group;
And substituted hydrocarbon groups such as γ-methacryloxypropyl group, γ-glycidoxypropyl group, 3,4-epoxycyclohexylethyl group, and γ-mercaptopropyl group. Among them, an alkyl group having 1 to 4 carbon atoms and a phenyl group are preferable from the viewpoint of ease of synthesis or availability.

Specific examples of the silicon compound include tetraalkoxysilanes such as tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetraisopropoxysilane and tetra-t-butoxysilane.

The partial hydrolysis of the silicon compound can be carried out by diluting it with an appropriate solvent. Examples of the diluting solvent include lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol and isobutanol; ethylene glycol derivatives such as ethylene glycol, ethylene glycol monobutyl ether, and ethylene glycol monoethyl ether acetate;
Derivatives of diethylene glycol such as diethylene glycol and diethylene glycol monobutyl ether; and
Examples thereof include diacetone alcohol, and one or more of these are used. Furthermore, in combination with a hydrophilic organic solvent, toluene, xylene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone,
Methyl ethyl ketoxime and the like can also be used.

The above-mentioned tetrafunctional silicone resin is produced, for example, by diluting the above-mentioned silicon compound with a solvent, adding water or a catalyst as a curing agent, and performing partial hydrolysis.

The amount of water used for the above partial hydrolysis is not particularly limited. Further, the catalyst used as required in the partial hydrolysis is not particularly limited, but an acidic catalyst is preferable from the viewpoint of shortening the time required for the production. Examples of the acidic catalyst include organic acids such as acetic acid, chloroacetic acid, citric acid, benzoic acid, dimethylmalonic acid, formic acid, propionic acid, glutaric acid, glycolic acid, maleic acid, malonic acid, toluenesulfonic acid, and oxalic acid. Inorganic acids such as hydrochloric acid, nitric acid, and halogenated silanes;
An acidic sol-like filler such as acidic colloidal silica and acidic titanium sol may be used, and one or more of these may be used. In the above partial hydrolysis, if necessary, the temperature may be raised to, for example, 40 to 100 ° C.

The prepared tetrafunctional silicone resin has a weight average molecular weight (MW) of 500 in terms of polystyrene.
０００3000. The weight average molecular weight is 90
0 to 3000 is more preferable. The weight average molecular weight is 5
When it is less than 00, it is difficult for the coating film to maintain sufficient abrasion resistance, and when the weight average molecular weight exceeds 3,000, it tends to gel, and the storage stability of the coating material composition may be reduced. is there.

The coating composition of the present invention comprises (B)
As a component, an optical semiconductor coated with silica is an essential constituent material. The optical semiconductor coated with the silica is used to reduce the contact angle of water on the surface of the coating film and improve the hydrophilicity, so that the coating film exhibits antifouling properties.

Examples of the optical semiconductor include metal oxides such as titanium oxide, zinc oxide, tin oxide and zirconium oxide, and strontium titanate. Among them, titanium oxide is preferable in terms of photocatalytic performance and availability, and anatase-type titanium oxide having crystallinity is preferable in that photocatalytic performance is developed in a short time. The optical semiconductor may be used alone or in combination of two or more.

The above-mentioned optical semiconductor is coated with silica so that it can be applied to an organic base material or an organic paint described later without a primer of an inorganic paint while maintaining the hydrophilicity of the coating film surface. However, it is possible to suppress deterioration of the base material and prevent peeling of the coating film due to long-term use.

The optical semiconductor coated with silica is, for example, a silica-coated titanium oxide containing 10 to 20% by weight of a silica component and 80 to 90% by weight of a titanium oxide component. is there.

The above-mentioned optical semiconductor preferably has an average primary particle diameter of 5 to 50 nm. If the average primary particle diameter is less than 5 nm, the abrasion resistance of the coating film may be reduced. If the diameter exceeds 50 nm, the smoothness and transparency of the coating film may be reduced.

The optical semiconductor having silica may be in any form as long as it can be dispersed in the coating material composition, such as powder, fine particle powder, solution-dispersed sol particles, and the like. Among them, the optical semiconductor having the silica is
When it is a sol having a pH of 7 or less dispersed in water or a mixed solution of water and a hydrophilic organic solvent, curing proceeds in a shorter time, and the composition is excellent in convenience in use. The dispersion medium for dispersing the optical semiconductor having silica in the coating material composition is not particularly limited as long as it can be uniformly dispersed, and any of an aqueous or non-aqueous solvent may be used. Can be. As the aqueous solvent usable as the dispersion medium, for example, water alone, methanol, ethanol, isopropanol, n-butanol,
Various hydrophilic organic solvents such as lower aliphatic alcohols such as isobutanol; ethylene glycol derivatives such as ethylene glycol and ethylene glycol monobutyl ether;
These mixed solvents are used. As a method of dispersing in the dispersion medium, for example, a homogenizer, a disper, a paint shaker, a bead mill, or the like can be used.

In the coating material composition of the present invention, the compounding weight ratio of the components (A) and (B) is in the range of (A) :( B) = 9: 1 to 5: 5 in terms of solid content. And the solid content of the component (A) and the component (B) is 5% by weight or less and 0.05% by weight or more based on the total amount of the composition. When the compounding weight ratio of the component (A) and the component (B) is outside the above range, if the component (B) is small, the antifouling property of the coating film is reduced,
If the amount of the component (B) is large, the base material may be deteriorated when applied to an organic base material or an organic paint described later without a primer of an inorganic paint. Further, the component (A) and the component (B)
If the solid content of the component exceeds 5% by weight, the transparency of the coating film may be reduced. If the solid content is less than 0.05% by weight, the coating operation may be difficult and a coating film having a uniform thickness may not be formed.

The coated article of the present invention is obtained by applying the above-mentioned coating composition to the surface of a substrate to form a coating film.

As the above-mentioned base material, various base materials can be used regardless of whether they are inorganic or organic. For example, an organic base material such as a plastic base material; a metal base material; And inorganic base materials such as ceramics. In particular, when the substrate is an organic substrate or an organic coating applied to the surface, the effect of the coating composition can be remarkably exhibited.

As the material of the organic base material, for example,
Thermosetting or thermoplastic plastics such as polycarbonate resin, acrylic resin, ABS resin, vinyl chloride resin, epoxy resin, and phenolic resin, and fiber reinforced plastics obtained by reinforcing these plastics with fibers such as glass fiber, nylon fiber, and carbon fiber ( FRP) and the like. Among them, a polycarbonate resin or an acrylic resin, which is widely used as a material for an organic base material having transparency, is preferable in that transparency is secured as an effect of the coating material composition.

Examples of the organic coating material include acrylic, alkyd, polyester, epoxy, urethane, acrylic silicone, and chlorinated rubber.
Phenol type and melamine type are mentioned.

In addition, the above-mentioned organic paint can also be applied with a primer layer formed for improving the adhesion to the substrate. Examples of the primer layer include a primer composition containing an acrylic resin, an alkyd resin, a polyester resin, an epoxy resin, a urethane resin, an acrylic silicone resin, a chlorinated rubber resin, a silicone resin, a phenol resin, and a melamine resin. The thickness of the primer layer is
Although not particularly limited, 0.1 to 50 μm is preferable,
0.5 to 10 μm is more preferable. If the thickness is too small, adhesion cannot be obtained. If the thickness is too large, foaming or the like may occur during drying.

[0038] The method of applying the above coating material composition to a base material includes, for example, brush coating, spray coating, dipping (also called dipping or dip coating), roll coating, flow coating, curtain coating, knife coating, spin coating, or the like. Various coating methods such as bar coating can be selected.

The thickness of the coating formed on the above-mentioned coated product is as follows:
0.1-1 μm is preferred. When the thickness of the coating film is in the above range, the coating film has transparency, and cracks and peeling hardly occur.

[0040] The above coating material composition exhibits an antifouling property because a coating film applied to an organic base material or a base material having a surface coated with an organic coating material can suppress the deterioration of the base material over a long period of time. That can be done.

Further, in the above-mentioned coated article, since the formed coating film can suppress the deterioration of the base material for a long period of time, it can exhibit transparency and antifouling property for a long period of time.

[0042]

EXAMPLES In order to confirm the effects of the present invention, a coating material composition for evaluation was prepared, and an evaluation test was conducted on a coated article having a coating film formed thereon. In Examples and Comparative Examples, unless otherwise specified, parts indicate parts by weight and% indicates% by weight. Also,
The molecular weight of the partial hydrolysis product of the tetrafunctional silicone resin can be measured by GPS (gel permeation chromatography) using HLC80 of Tosoh Corporation as a measurement model.
A standard polystyrene calibration curve was prepared using No. 20 and measured as a converted value.

Example 1 The following components were prepared as the component (A). 208 parts of tetraethoxysilane was diluted with 356 parts of methanol, and further 18 parts of water and 18 parts of 0.1N hydrochloric acid were mixed and stirred using a disper. The obtained liquid is heated in a 60 ° C. constant temperature bath for 2 hours to adjust the weight average molecular weight (Mw) to 950, so that the tetrafunctional silicone resin (A) (solid content in the coating film is 10%)
I got

As the component (B), a silica-coated sol of anatase-type titanium oxide having an average primary particle diameter of 15 nm (manufactured by Catalyst Chemicals, Inc .; trade name: Queen Titanic:
Silica component 15%, solid content 20.6%).

Component (A) 4-functional silicone resin 90
Parts and 4.85 parts of the titanium oxide sol of the component (B) were mixed, and the mixture was stirred using a homogenizer, further diluted with methanol, and mixed with the components (A) and ( The coating material composition was obtained by adjusting the solid content of the component (B) to 5%. In addition, the compounding weight ratio of the component (A) and the component (B) is (A):
(B) = 9: 1.

This coating material composition was applied to the surface of an acrylic substrate by a spin coater coating machine, and then applied at 120 ° C.
For 30 minutes to form a coating film and obtain a coated product for evaluation. In addition, the thickness of this coating film was 0.2 to 0.3 μm.

Example 2 The same components as in Example 1 were used as the components (A) and (B). (A) Component 4
A mixture of 50 parts of the functional silicone resin and 24.27 parts of the titanium oxide sol of the component (B) was stirred using a homogenizer, and further diluted with methanol to obtain (A) based on the total amount of the composition. The coating material composition was obtained by preparing component (B) and component (B) such that the solid content was 5%. In addition, the compounding weight ratio of the component (A) and the component (B) is (A) :( B) = 5: 5 in terms of solid content. Then, a coating film was formed on the surface of the acrylic substrate using the coating material composition in the same manner as in Example 1 to obtain a coated product for evaluation.

Example 3 The same components as in Example 1 were used as the components (A) and (B). (A) Component 4
A mixture of 82.5 parts of the functional silicone resin and 6.07 parts of the titanium oxide sol of the component (B) was stirred using a homogenizer, and further diluted with methanol to obtain a mixture based on the total amount of the composition. The coating material composition was obtained by adjusting the solid content of the components (A) and (B) to 5%. In addition, the compounding weight ratio of the component (A) and the component (B) is (A) :( B) = 8.25: 1.25 in terms of solid content.
It is. Then, this coating material composition was prepared in Example 1.
A coating film was formed on the surface of the acrylic substrate in the same manner as in Example 1 to obtain a coated product for evaluation.

Example 4 In Example 1, the components (A) and (B) were mixed and diluted with methanol, and the solid content of the components (A) and (B) relative to the total amount of the composition was adjusted. Example 1 except that the amount was 0.05%.
And a coating material composition was obtained. Then, a coating film was formed on the surface of the acrylic substrate using the coating material composition in the same manner as in Example 1 to obtain a coated product for evaluation.

Comparative Example 1 The same components as in Example 1 were used as the components (A) and (B). (A) Component 4
A mixture of 95 parts of the functional silicone resin and 2.43 parts of the titanium oxide sol of the component (B) was stirred using a homogenizer, and further diluted with methanol.
The coating material composition was obtained by adjusting the solid content of the component (A) and the component (B) to 5% based on the total amount of the composition. In addition, the compounding weight ratio of the component (A) and the component (B) is
(A) :( B) = 9.5: 0.5 in terms of solid content.
Then, a coating film was formed on the surface of the acrylic substrate using the coating material composition in the same manner as in Example 1 to obtain a coated product for evaluation.

Comparative Example 2 The same components as in Example 1 were used as the component (A) and the component (B). (A) Component 4
Forty parts of the functional silicone resin and 29.13 parts of the titanium oxide sol of the component (B) were mixed, and the mixture was stirred using a homogenizer, further diluted with methanol, and mixed with (A) based on the total amount of the composition. The coating material composition was obtained by preparing component (B) and component (B) such that the solid content was 5%. The compounding weight ratio of the components (A) and (B) is (A) :( B) = 4: 6 in terms of solid content. Then, a coating film was formed on the surface of the acrylic substrate using the coating material composition in the same manner as in Example 1 to obtain a coated product for evaluation.

(Comparative Example 3) A sol of titanium oxide having an average primary particle diameter of 7 nm (manufactured by Ishihara Sangyo Co., Ltd.) was used as the component (A) in the same manner as in Example 1, and instead of the component (B), an optical semiconductor was used. (TSS-01, solid content 30%).
16.67 parts of the titanium oxide sol is mixed with 50 parts of the tetrafunctional silicone resin (A), and the mixture is stirred using a homogenizer, and further diluted with methanol to obtain a mixture based on the total amount of the composition. The coating material composition was obtained by adjusting the solid content to 5% in total of the component (A) and the optical semiconductor. The compounding weight ratio of the component (A) and the optical semiconductor is (A): optical semiconductor = 5: 5 in terms of solid content. Then, a coating film was formed on the surface of the acrylic substrate using the coating material composition in the same manner as in Example 1 to obtain a coated product for evaluation.

Comparative Example 4 The procedure of Comparative Example 3 was repeated except that the mixture was diluted with methanol so that the total solid content of the component (A) and the photosemiconductor was 0.03% with respect to the total amount of the composition. In the same manner as in Comparative Example 3, a coating material composition was obtained. Thereafter, a coating film was formed on the surface of the acrylic base material using the coating material composition in the same manner as in Comparative Example 3 to obtain a coated product for evaluation.

Comparative Example 5 A sol of titanium oxide having an average primary particle diameter of 7 nm (manufactured by Ishihara Sangyo Co., Ltd.) was used as the component (A) in the same manner as in Example 1, but instead of the component (B) as an optical semiconductor. (TSS-01, solid content 30%).
90 parts of the tetrafunctional silicone resin (A) and 3.33 parts of this titanium oxide sol are mixed, the mixture is stirred using a homogenizer, further diluted with methanol, and mixed with the total amount of the composition. The coating material composition was obtained by adjusting the solid content of the component (A) and the optical semiconductor so that the total content was 7%. The compounding weight ratio of the component (A) to the optical semiconductor is (A): optical semiconductor = 9: 1 in terms of solid content. Then, a coating film was formed on the surface of the acrylic substrate using the coating material composition in the same manner as in Example 1 to obtain a coated product for evaluation.

(Evaluation) The performance of the coating film of the obtained coated product was evaluated. Evaluation was made by measuring the presence or absence of peeling of the coating film as the deterioration of the coating film, the haze as the transparency, and the contact angle with water as the antifouling property. Samples for measurement were the initial stage of coating film formation and JIS-A-14.
500 hours passed under the conditions of the accelerated weathering test by irradiation of the ultraviolet fluorescent lamp specified in 15 above.

The peeling of the coating film was performed in a grid pattern at intervals of 2 mm on the surface of the coating film according to JIS-K-5400. did.

For transparency, haze, which is a specific optical property related to wide-angle scattering of light rays, was determined based on JIS-K-7136. A value of 0 indicates transparency, and a larger value indicates higher whiteness. A coating film having a value of 5 or less was determined to have transparency.

The contact angle with water was measured by using CA-W150 manufactured by Kyowa Interface Science Co., Ltd.
The contact angle at which distilled water was dropped was measured. The smaller the contact angle, the better the hydrophilicity.

[0059]

[Table 1]

(Results) Table 1 shows the conditions for preparing the coating film and the evaluation results. In each of the examples, after 500 hours, it was confirmed that the coating film did not peel off and exhibited transparency and antifouling properties.

[0061]

The coating material composition according to any one of claims 1 to 3 is applied to an organic base material or a base material having a surface coated with an organic paint to form a coating film over a long period of time. The antifouling property can be exhibited without peeling.

The coated articles according to claims 4 to 8 have good transparency and antifouling properties without the coating film formed on the surface being peeled off over a long period of time.

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4F100 AA21A AK01B AK25B AK45B AK52A AT00B BA02 BA25A CA23A CC00A DE01A EH462 JK06 JL06 YY00A 4J038 DL021 HA216 HA446 KA12 KA15 KA20 MA07 NA01 NA05 NA12 NA09 PC

Claims (8)

[Claims] 1. The following components (A) and (B) are used as constituent materials, and the mixing weight ratio of the components (A) and (B) is (A) :( B) = 9: 1 to 1 in terms of solid content. 5: 5 range,
A coating material composition having a total solid content of the component (A) and the component (B) of not more than 5% by weight and not less than 0.05% by weight based on the total amount of the composition. Component (A); a silicon compound represented by the general formula Si (OR) ₄ (1) (wherein R represents the same or different monovalent hydrocarbon group) is partially hydrolyzed to obtain a polystyrene having a weight average molecular weight of polystyrene. A tetrafunctional silicone resin prepared to a conversion of 500 to 3000, (B) component: an optical semiconductor coated with silica. 2. The coating material composition according to claim 1, wherein the component (B) has an average primary particle diameter of 5 to 50 nm. 3. The coating material composition according to claim 1, wherein the optical semiconductor of the component (B) is anatase type titanium oxide. 4. A coated article formed by applying the coating material composition according to claim 1 to the surface of a substrate to form a coating film. 5. The coated article according to claim 4, wherein said coating has a thickness of 0.1 to 1 μm. 6. The coated article according to claim 4, wherein the base material is an organic base material. 7. The coated article according to claim 6, wherein the material of said organic base material is a polycarbonate resin or an acrylic resin. 8. The substrate according to claim 4, wherein an organic paint is applied to the surface of the substrate.
Any of the painted items described.