JPH0449588B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a coating composition that improves the surface conditions of plastic products, wood products, metal products, etc., such as surface hardness, weather resistance, and chemical resistance. Plastic moldings such as polycarbonate, polymethyl methacrylate, polystyrene,
Polyvinyl chloride and other materials have excellent transparency, lightness, ease of processing, and impact resistance, but they have poor abrasion resistance and solvent resistance, and their surfaces are easily scratched and easily attacked by organic solvents. There is a drawback. Although methods of coating with various curable resins have been proposed as a method to improve these drawbacks, at present no fully satisfactory method has been obtained. For example, trialkoxysilanes such as methyltrialkoxysilane and phenyltrialkoxysilane, combinations of these with tetraalkoxysilanes such as ethylsilicate and butylsilicate, or mixtures with other resin paints are known. It has not been possible to obtain a coating that has good physical properties such as abrasion resistance, hot water resistance, heat resistance, adhesion, and paint pot life. In addition, the special public official 15743, Showa 53-15743,
53-35589, epoxy group-containing alkoxysilanes, Lewis acids such as BF ₃ , BF ₃ etherate, or their complexes, HCl, HBr, HI, HNO ₃ , HClO ₄ ,
The use of metal salts of organic acids such as Brønsted acid such as H ₃ PO ₄ , cobalt naphthenate, and zinc naphthenate as a curing catalyst has been disclosed, but these have a short pot life or take a long time to cure. is not practical. Japanese Patent Publication No. 52-39691 discloses a coating composition containing a hydrolyzate of colloidal silica and methyltrimethoxysilane as main components, and this cured coating film has sufficient hardness but is not flexible. Furthermore, it is extremely difficult to obtain good adhesion to plastic substrates. JP-A-53-111336 discloses a mixture of one or more compounds selected from compounds containing epoxy groups and/or silanol and/or siloxane groups, silica fine particles of 1 to 100 millimicrons, and aluminum chelate. Although coating compositions containing the compound have been disclosed, the hardness of these cured coatings is insufficient and the hardness decreases when immersed in boiling water. -39) and bisphenol type polycarbonate. Based on the above, in order to eliminate such drawbacks, the present inventors first developed a coating composition containing a hydrolyzate of an epoxy group-containing silane, colloidal silica, a hydrolyzate of an organosilicon compound, and a curing catalyst. Although he filed a patent application for
25644 (Japanese Patent Publication No. 63-14752)), the coating obtained by curing this composition had excellent abrasion resistance, hot water resistance, and adhesion. It was found that this occurs. Therefore, as a result of repeated research to find a coating composition that does not cause minute cracks in a weather test without impairing the above performance, the present invention was achieved. The present invention provides () a colloidal silica-containing organopolysiloxane composition, and ()(-1) a functional group-containing acrylic polymer, (-2) an aliphatic and/or alicyclic epoxy compound, and (-3) a A coating composition containing at least one type selected from alcohols. In the present invention, the colloidal silica-containing organopolysiloxane composition () above refers to at least one member selected from the group consisting of the following (A) and (B), (C) and (D), and (A) general Formula (1) (In the formula, R ¹ is an organic group having an epoxy group, R ²
is hydrogen or a hydrocarbon group having 1 to 6 carbon atoms, R ³
is a hydrocarbon group having 1 to 5 carbon atoms, an alkoxyalkyl group or an acyl group having 1 to 4 carbon atoms, and a is 1 to 4 carbon atoms.
3, b is 0 to 2, and a+b≦3. ) One or more hydrolysates selected from silicon compounds having an epoxy group represented by (B) General formula (2) R ⁴ _c -Si-(OR) ⁵ _4-c (2) (Formula Among them, R ⁴ is a hydrocarbon group having 1 to 6 carbon atoms, or an organic group having methacryloxy group, amino group, mercapto group, fluorine or chlorine, R ⁵
is a hydrocarbon group having 1 to 5 carbon atoms, an alkoxyalkyl group or an acyl group having 1 to 4 carbon atoms, and c is 0
~3. ) refers to a composition containing a hydrolyzate of an organosilicon compound represented by (C) colloidal silica, and (D) a curing catalyst. Examples of the silicon compound having an epoxy group as component (A) represented by the general formula () used in the present invention include the following. Specific examples of silicon compounds having one glycidoxy group include glycidoxymethyltrimethoxysilane,
Glycidoxymethyltriethoxysilane, β-
Glycidoxyethyltrimethoxysilane, β-
Glycidoxyethyltriethoxysilane, γ-
Glycidoxypropyltrimethoxysilane, γ
-Glycidoxypropyltriethoxysilane, γ-glycidoxypropyltri(methoxyethoxy)silane, γ-glycidoxypropyltriacetoxysilane, δ-glycidoxybutyltrimethoxysilane, δ-glycidoxybutyltriethoxy Silane, glycidoxymethyl dimethoxysilane, glycidoxymethyl(methyl)dimethoxysilane, glycidoxymethyl(ethyl)dimethoxysilane, glycidoxymethyl(phenyl)dimethoxysilane, glycidoxymethyl(vinyl)dimethoxysilane, glycidoxymethyl(vinyl)dimethoxysilane, glycidoxymethyl(vinyl)dimethoxysilane, Sidoxymethyl(dimethyl)methoxysilane,
β-glycidoxyethyl(methyl)dimethoxysilane, β-glycidoxyethyl(ethyl)dimethoxysilane, β-glycidoxyethyl(dimethyl)methoxysilane, γ-glycidoxypropyl(methyl)dimethoxysilane, γ- Glycidoxypropyl (ethyl) dimethoxysilane, γ-glycidoxypropyl (dimethyl) methoxysilane, δ-glycidoxybutyl (methyl) dimethoxysilane, δ-glycidoxybutyl (ethyl) dimethoxysilane, δ-glycid Specific examples of silicon compounds having two or three glycidoxy groups include xybutyl(dimethyl)methoxysilane, bis(glycidoxymethyl)dimethoxysilane, bis(glycidoxymethyl)dimethoxysilane, and bis(glycidoxymethyl)dimethoxysilane. methyl)dimethoxysilane, bis(glycidoxypropyl)diethoxysilane, tris(glycidoxymethyl)methoxysilane, tris(glycidoxymethyl)ethoxysilane, tris(glycidoxyethyl)methoxysilane, tris(glycidoxyethyl)methoxysilane xyethyl)ethoxysilane, tris(glycidoxypropyl)methoxysilane, tris(glycidoxypropyl)ethoxysilane, Specific examples of silicon compounds having a glycidyl group include glycidylmethyltrimethoxysilane, glycidylmethyltriethoxysilane, β
-Glycidylethyltrimethoxysilane, β-
Glycidylethyltriethoxysilane, γ-glycidylpropyltrimethoxysilane, γ-glycidylpropyltriethoxysilane, γ-glycidylpropyltri(methoxyethoxy)silane, γ-glycidylpropyltriacetoxysilane, silicon compound having an alicyclic epoxy group Specific examples include 3,4-epoxycyclohexylmethyltrimethoxysilane, 3,4-epoxycyclohexylmethyltriethoxysilane,
Examples include 3,4-epoxycyclohexylethyltrimethoxysilane, 3,4-epoxycyclohexylpropyltrimethoxysilane, and 3,4-epoxycyclohexylbutyltrimethoxysilane. The above general formula which is component (B) used in the present invention
Examples of the organosilicon compound represented by (2) include the following. That is, trimethylmethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, tetraethoxysilane, phenyltrimethoxysilane, phenylmethyldimethoxysilane, vinyltriethoxysilane, vinyl-tris(β-methoxyethoxy)silane, vinyltriacetoxy Silane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-bis(β
-hydroxyethyl)-γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-
γ-aminopropyl(methyl)dimethoxysilane, γ-chloropropyltrimethoxysilane,
γ-mercaptopropyltrimethoxysilane,
Examples include 3,3,3-trifluoropropyltrimethoxysilane. These may be used alone or in combination of two or more. Component (C) colloidal silica is an acidic or basic colloidal solution in which ultrafine particles of silicic anhydride, preferably with a particle size of 1 to 100 millimicrons, are dispersed in a dispersion solvent such as water or alcohol. , manufactured by well-known methods,
It is commercially available. Next, component () will be explained. In the present invention, component () is at least one selected from (-1) a functional group-containing acrylic polymer, (-2) an aliphatic and/or alicyclic epoxy compound, and (-3) a polyhydric alcohol. The functional group-containing acrylic polymer of component (-1) is a polymer containing as a polymerization component, for example, at least one monomer selected from acrylic acid or methacrylic acid derivatives having a hydroxyl group in a side chain. Therefore, in addition to these hydroxyl group-containing acrylic monomers, copolymers containing other functional group-containing alkyl monomers or other copolymerizable monomers are also included. Specific examples of hydroxyl group-polymerized acrylic monomers include hydroxyethyl (meth)acrylate, diethylene glycol mono(meth)acrylate, and glycerin mono(meth)acrylate. Other functional group-containing acrylic monomers include acrylic acid and methacrylic acid having functional groups such as carboxyl group, amino group, epoxy group, amide group, mercapto group, sulfonic acid group, tetrahydrofurfuryl group, and alkoxysilyl group in the side chain. acids or their derivatives. Specific examples include dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, glycidyl (meth)acrylate, meth(acrylamide, N-
Methylol (meth)acrylamide, diacetone (meth)acrylamide, mercaptopropyl (meth)acrylate, mercaptohexyl (meth)acrylate, sulfoethyl (meth)acrylate, sulfopropyl (meth)acrylate,
(meth)acrylic acid, itaconic acid, maleic acid,
Examples include tetrahydrofurphthalyl (meth)acrylate, γ-(meth)acryloxypropyltrimethoxysilane, and the like. In addition, monomers that can be copolymerized with hydroxyl group-containing acrylic monomers or other functional group-containing acrylic monomers include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, 2- (meth)acrylic acid alkyl esters such as ethylhexyl (meth)acrylate and lauryl (meth)acrylate, 2,2,2
- trifluoroethyl (meth)acrylate,
3,3,3-trifluoropropyl (meth)acrylate, 2,2,3,3-tetrafluoropropyl (meth)acrylate, 2,2,3,3,
Alkyl (meth)fluoride such as 4,4,5,5,-octafluoropentyl (meth)acrylate
Examples include acrylates, vinyl acetate, and styrene. Polymers obtained from the above monomers may be used alone, or two or more types of polymers may be mixed. The aliphatic and/or alicyclic epoxy compound of component (-2) has two or more epoxy groups. For example, (poly)ethylene glycol, (poly)propylene glycol, diethylene glycol, triethylene glycol, neopentyl glycol, glycerin, trimethylolpropane, pentaerythritol, diglycerin,
Polyglycidyl ethers obtained from polyhydric alcohols such as sorbitol and epichlorohydrin,
hydrogenated bisphenol A dicrycidyl ether,
3,4-epoxycyclohexylmethyl-3,4
-Epoxycyclohexane carboxylate, epoxidized polybutadiene, and the like. The polyhydric alcohol of component (-3) is the polyhydric alcohol itself or its alkylene oxide adduct. For example, polyhydric alcohols such as (poly)ethylene glycol, (poly)propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, glycerin, trimethylolpropane, pentaerythritol, digcerin, sorbitol, and Examples thereof include ethylene oxide and/or propylene oxide adducts. By using component () in combination with component (), it is possible to prevent the occurrence of microcracks in weather resistance tests using Sunshine Weather-Ometer without impairing various properties such as abrasion resistance, hot water resistance, and adhesion. Can be done. In the present invention, one or more hydrolysates selected from the silicon compounds having an epoxy group represented by the general formula (1) used as the component (A) and the general formula ( The hydrolyzate of one or more selected from the organosilicon compounds shown in 2) is one in which a part or all of the alkoxy group, alkoxyalkoxy group, or acyloxy group in the silicon compound is substituted with a hydroxyl group. and some naturally condensed substituted hydroxyl groups. These hydrolysates can be obtained by hydrolysis in a mixed solvent such as water and alcohol in the presence of an acid, as is known in the art. When the silicon compounds represented by the general formulas (1) and (2) are used without being hydrolyzed, the cured coating film becomes white and the abrasion resistance is insufficient. When using the silicon compounds represented by the general formulas (1) and (2) as a hydrolyzate, better results are often obtained by mixing them and simultaneously co-hydrolyzing them than by hydrolyzing them separately. In the present invention, the mixing amount of components (A), (B), and (C) is a total of 100 parts by weight of component (A) (calculated on solid content,

Calculate as [Formula]. ), a total of 56 to 550 parts by weight of component (B) (calculated on solid content,

Calculate as [Formula]. ] and component (C) 4 to 334 parts by weight [calculated based on solid content and calculated as SiO _{2 ]} . ], the total of component (B) and component (C) is preferably 6 to 567 parts by weight, and component () is component (A),
0.5 to 100 parts by weight of the total solid content of (B) and (C)
Use 100 parts by weight (calculated based on solid content).
More preferably, based on 100 parts by weight of component (A), component
(B) is 105 to 430 parts by weight, and component (C) is 16 to 200 parts by weight, and the total of components (B) and (C) is 121 to 473 parts by weight, and component () is component (A), The amount is 1 to 30 parts by weight per 100 parts by weight of (B) and (C) (calculated based on solid content). If the amount of component () added is less than 0.5 part by weight, the effect of combined use will be reduced, and
If it exceeds 100 parts by weight, the adhesion on the substrate becomes extremely poor and the hardness also decreases. Component () may be simply mixed with component (), or may be reacted in advance. Next, as the curing catalyst for component (D), the following catalysts can be used. i.e. ammonium perchlorate, ammonium nitrate, ammonium chloride,
ammonium sulfate, ammonium thiocyanate,
Perchloric acid, hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid, sulfonic acid, para-toluenesulfonic acid, boron trifluoride and its chains with electron donors, SnCl ₄ , ZnCl ₃ ,
Complexes of Lewis acids such as FeCl ₃ , AlCl ₃ , SbCl ₅ , TiCl ₄ , sodium acetate, zinc naphthenate,
Organic acid metal salts such as cobalt naphthenate, zinc octylate, and tin octylate; borofluoride metal salts such as zinc borofluoride and tin borofluoride; boric acid organic esters such as ethyl borate and methyl borate; sodium hydroxide , alkalis such as potassium hydroxide, titanate esters such as tetrabutoxytitanium and tetraisopropoxytitanium, metals such as chromium acetylacetonate, titanyl acetylacetonate, aluminum acetylacetonate, cobalt acetylacetonate, nickel acetylacetonate, etc. Acetylacetonates. n-
Butylamine, di-n-butylamine, tri-n
- Amines such as butylamine, guanidine, biguanide, imidazole, highly fluorinated aliphatic sulfonates such as ammonium trifluoromethylsulfonate, sodium trifluoromethylsulfonate, potassium trifluoromethylsulfonate,
NH ₄ (CF ₃ CO ₂ ) ₂ C・Br, K (CF ₃ SO ₂ ) ₂ CH, Ba
Examples include highly fluorinated aliphatic sulfonyl compounds such as [(CF ₃ SO ₂ ) ₂ CH] ₂ and the like. Among these curing catalysts, avonium perchlorate, ammonium chloride, ammonium sulfate, sodium acetate, and ammonium trifluoromethylsulfonate are used as curing catalysts that provide good hardness and transparency of the coating film, and have a long pot life of the coating solution. and perchlorates, hydrochlorides, sulfates, nitrates, carboxylates, highly fluorinated aliphatic sulfonates, and highly fluorinated aliphatic sulfothyl compounds represented by bis(trifluoromethylsulfonyl)bromomethylammonium. is suitable. As the curing catalyst contained in the coating composition of the present invention, one or two of the various curing catalysts mentioned above may be used.
There is no problem in using more than one species in combination. The amount of these curing catalysts added is preferably 0.05 to 10 parts by weight based on the solid content of the coating composition.
It is 0.15% by weight. Examples of solvents that may be included in the coating composition include alcohols, ketones, esters, ethers, cellosolves, halides, carboxylic acids, aromatic compounds, and one or two of these. It can be used as a mixed solvent of the above. In particular, lower alcohols such as methanol, ethanol, propanol, isopropanol, and butanol, cellosolves such as methyl cellosolve, ethyl cellosolve, and butyl cellosolve, lower alkyl carboxylic acids such as formic acid, acetic acid, and propionic acid, aromatic compounds such as toluene and xylene, and acetic acid. It is preferable to use esters such as ethyl and butyl acetate, and ketones such as acetone and methyl ethyl ketone alone or as a mixed solvent. Furthermore, in order to obtain a smooth coating film, a flow control agent such as a fluorine-based or silicone-based agent may be added if necessary. The amount of these flow control agents added is sufficient in a small amount, and is 0.01 to 5 parts by weight, more preferably 0.03 to 3 parts by weight, based on the entire coating composition. Further, small amounts of antioxidants, ultraviolet absorbers, etc. can also be added. The composition of the present invention is coated by a commonly used coating method such as dipping, spraying, roller coating, or flow coating, and then at a temperature below the deformation temperature of the substrate (for example, 130°C). By baking and curing for 20 minutes to 5 hours, a coating film with good abrasion resistance, hot water resistance, adhesion and weather resistance can be obtained. The preferred thickness of this coating is 1 to 30 microns.
More preferably, it is 3 to 15 microns. If it is less than 1 micron, the wear resistance will not be sufficient;
When the thickness exceeds microns, cracks are more likely to occur. The compositions of the invention can be applied to plastic substrates such as polycarbonate, polymethyl methacrylate, polystyrene and polyvinyl chloride. If adhesion is a particular problem, a primer treatment can provide a coating film with sufficiently effective adhesion. The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited by these Examples. Note that parts and % in the examples indicate parts by weight and % by weight, respectively. The performance of the coating film was evaluated using the following method. That is, abrasion resistance: The resistance to scratching was examined by rubbing with #0000 steel wool and judged as follows. A: No scratches even if rubbed strongly. B: Slight scratches occur when rubbed strongly. C: Even weak friction causes scratches. Adhesion: In the so-called cross-cut tape test, 11 parallel lines were placed vertically and horizontally at 1 mm intervals on the surface of the coating film, and 100 squares were cross-cut.
After adhering a cellophane adhesive tape thereon, the tape was peeled off, and the number of squares that did not peel off among 100 squares was indicated. Hot water resistance: The state of the coating film was examined after being immersed in boiling water for 1 hour. Heat resistance: The state of the coating film was examined after being stored in a hot air drying oven at 120°C for 100 hours. Chemical resistance: The state of the coating film was examined after immersion in the following chemicals at room temperature for 100 hours. 3% sulfuric acid, 1% sodium hydroxide, 95% ethanol, acetone, ethyl acetate, carbon tetrachloride,
Toluene, n-heptane, 10% saline. Example 1 γ-glycidoxypropyltrimethoxysilane
80 parts, 144 parts of methyltrimethoxysilane, colloidal silica (Snowtex manufactured by Nissan Chemical Industries, Ltd.)
C, solid content 20%) 71 parts and 170 parts of 0.1N hydrochloric acid aqueous solution
The two parts were mixed and refluxed at 80-85°C for 2 hours to effect hydrolysis. The obtained solution is

γ-glycidoxypropyltrimethoxysilane hydrolyzate 12.2% calculated as [Formula], methyltrimethoxysilane hydrolyzate calculated as CH ₃ SiO _1.5 15.3
% and contained 3.1% colloidal silica calculated as _SiO2 . Co-hydrolyzate solution thus obtained 327
16.7 parts (solid content 100 parts) of ethyl cellosolve solution of hydroxyethyl methacrylate/glycidyl methacrylate copolymer (solid content 30%, monomer charge ratio 1:1) (solid content 5 parts),
Ethyl cellosolve 58.2 parts, ammonium perchlorate
1.0 part and 0.5 part of a flow control agent were added to prepare a paint. The above paint was applied to a diethylene glycol bisallyl carbonate (trade name: CR-39) flat plate that had been cleaned in advance, and was cured by heating and drying in a hot air drying oven at 130°C for 60 minutes. The coating film thus obtained had a good appearance, abrasion resistance of A, and adhesion of 100/100. Furthermore, after 1000 hours of hot water resistance test and sunshine weather meter test, the appearance was good with no microcracks, and the abrasion resistance and adhesion were A and 100/100, respectively. Comparative Example 1 In Example 1, a paint was prepared without adding the hydroxyethyl methacrylate/glycidyl methacrylate copolymer ethyl cellosolve solution,
When the same treatment as in Example 1 was performed, the initial performance was good, but the sunshine in weather test
After 1000 hours, many microcracks occurred. Examples 2 to 11 In Example 1, the proportions of the A component, B component, and C component of the component () were varied as shown in Table 2, and the components () shown in Table 1 were changed to Table 2. A similar experiment was conducted by blending the ingredients in the proportions shown. The evaluation results of the coating film performance are also summarized in Table 2, and both the initial performance and the performance after the Sunshine Weather-Ometer test were good.

【table】

【table】

[Table] Examples 12 to 16 55.8 parts of γ-glycidoxypropyltriethoxysilane as component A, 136.2 parts of methyltrimethoxysilane and 6.9 parts of tetraethoxysilane as component B, and colloidal silica (Nissan Chemical Co., Ltd. ) Snowtex 0, solid content 20%) 40
Hydrolysis was carried out in the same manner as in Example 1 using 129.8 parts of 0.1N hydrochloric acid as a catalyst. The obtained solution is

γ-glycidoxypropyltriethoxysilane hydrolyzate 9.1% calculated as [Formula], methyltrimethoxysilane hydrolyzate 18.2% calculated as CH ₃ SiO _1.5 ,
It contained 0.5% tetraethoxysilane hydrolyzate calculated as _{SiO2 and 2.2% colloidal silica calculated as SiO2 .} Co-hydrolyzate solution obtained in this way 333
16.7 parts (solid content 100 parts) of ethyl cellosolve solution of hydroxyethyl methacrylate/glycidyl methacrylate copolymer (solid content 30%, monomer charge ratio 1:1) (solid content 5 parts),
65.5 parts of ethyl cellosolve, ammonium perchlorate
1.0 part and 0.5 part of a flow control agent were added to prepare a paint. Apply the above paint to a pre-cleaned CR-39 flat plate,
It was cured by heating and drying in a hot air drying oven at 130°C for 60 minutes.
The coating film thus obtained had a good appearance, abrasion resistance of A, and adhesion of 100/100. Furthermore, the appearance after 1000 hours of hot water test and sunshine weather meter test was good, with no microcracks, and wear resistance and adhesion were A and 100/1, respectively.
It was 100. Similarly, four components () were chosen from those shown in Table 1, blended in the proportions shown in Table 3, and the coating film performance was evaluated. The results are also summarized in Table 3, and both the initial performance and the performance after the Sunshine Weather-Ometer test were good.

【table】

【table】

Claims (1)

[Claims] 1 () At least one member selected from the group consisting of the following (A) and (B), (C) and (D), (A) General formula (1) (In the formula, R ¹ is an organic group having an epoxy group,
R ² is hydrogen or a hydrocarbon group having 1 to 6 carbon atoms,
^R3 is a hydrocarbon group having 1 to 5 carbon atoms, an alkoxyalkyl group, or an acyl group having 1 to 4 carbon atoms, a is 1 to 3, b is 0 to 2, and a+
b≦3. ) One or more hydrolysates selected from silicon compounds having an epoxy group represented by (B) General formula (2) R ⁴ _c -Si-(OR) ⁵ _4-c (2) (Formula Among them, R ⁴ is a hydrocarbon group having 1 to 6 carbon atoms,
or a methacryloxy group, an amino group, a mercapto group, an organic group having fluorine or chlorine, R ⁵ is a hydrocarbon group having 1 to 5 carbon atoms, an alkoxyalkyl group or an acyl group having 1 to 4 carbon atoms, c is 0 to 3 It is. ), (C) colloidal silica, (D) a colloidal silica-containing organopolysiloxane composition containing a curing catalyst, and ()(-1) a hydroxyl group-containing acrylic polymer, (- 2) A coating composition containing at least one selected from an aliphatic and/or alicyclic epoxy compound having at least two epoxy groups, and (-3) a polyhydric alcohol or an alkylene oxide adduct thereof. 2 The colloidal silica-containing organopolysiloxane composition of () above is the hydrolyzate of (A)
100 parts by weight (calculated based on solid content,
Calculate as [Formula]. ), 56 to 550 parts by weight of the above (B) hydrolyzate (calculated on solid content,
Calculated as R ⁴ _c −Si−O _4-C/2 . ), the above (C) colloidal silica 4 to 334 parts by weight (calculated as solid content, calculated as SiO ₂ ) (however, the total of (B) and (C) does not exceed 567 parts by weight), and the above (D) The coating composition according to claim 1, which comprises a curing catalyst. 3 The content of the hydrolyzate (B) is 105 to 430 parts by weight, and the content of the colloidal silica (C) is 16 to 430 parts by weight.
200 parts by weight, and the total of (B) and (C) does not exceed 473 parts by weight. 4 (-1) of the above () hydroxyl group-containing acrylic polymer, (-2) aliphatic and/or alicyclic epoxy compound having at least two epoxy groups, and (-3) polyhydric alcohol or alkylene oxide addition thereof The content of at least one selected from the following is 0.5 to 100 parts by weight per 100 parts by weight of the total solid content of (A), (B), and (C) in component () (calculated based on solid content). ) The coating composition according to claim 1. 5. The curing catalyst according to claim 1, wherein the curing catalyst is selected from perchlorates, hydrochlorides, sulfates, nitrates, carboxylic acids, highly fluorinated aliphatic sulfonates, and highly fluorinated aliphatic sulfonyl compounds. Coating composition.