JPS5968377A - Coating composition and its preparation - Google Patents

Abstract

PURPOSE:To prepare a coating composition which forms a film excellent in hardness, resistance to chemicals, transparency and glaring preventive effect, by hydrolyzing an organoalkoxy-silane in a silica-containing aqueous dispersion, adding a lower aliphatic alcohol to it and then removing surplus water by azeotropic distillation. CONSTITUTION:100pts.wt. organoalkoxysilane of the formula (where R<1> is methyl, ethyl, vinyl, phenyl, gamma-chloropropyl, gamma-methacryl-oxypropyl, gamma-glycidoxypropyl, 3,4-epoxycyclohexylethyl or gamma-mercaptopropyl; R<2> is methyl, ethyl, or propyl) is hydrolyzed in a colloidal aqueous dispersion which contains 5- 200pts.wt. silica. A lower aliphatic alcohol is added to the above and surplus water is distilled out azeotropically while condensation reaction of the hydrolysis product is being controlled. Then solid content of the product is adjusted to 10-40wt% by adding a solid content regulating agent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a coating composition and a method for aqueous coating thereof, and further relates to a coating composition for coating on the surfaces of plastic molded products, wood, metal, etc. A coating with excellent hardness and chemical resistance, transparency and anti-glare IL effect. give,
The present invention relates to coating compositions useful in those profiteering departments and methods for producing the same.

[Technical background of the invention and its problems]

In recent years, molded bodies made of transparent plastic instead of transparent glass have been used for lenses for eyeglasses and other optical equipment, or for buildings and columns due to their lightness, ease of processing, and excellent impact resistance. It is used in a wide range of applications, including window glass for transportation vehicles such as automobiles.

Among such transparent plastic materials, one of the widely used acidic materials is Polycar+L? nate resins are known. The molded product made of this material 751 has excellent impact resistance and high heating deflection temperature, and has dimensional stability, processing (:l:), and self-extinguishing property of 1ε mortar 1. On the other hand, it has low surface hardness. The problem is that it is easily scratched and scratched, and the transparency, which is important for lenses and glass, is impaired.

In addition, as other plastic materials, 1 Molded products made of these materials have poor wear resistance, chemical resistance, and solvent resistance compared to other materials, and their surfaces are easily scratched. There is a problem with this.

In order to solve these problems, various attempts have been made to form a protective film on the surface of transparent plastic materials to improve the surface hardness.

For example, 71 Publication No. 51-2736, Japanese Patent Application Publication No. 54
87736 and JP-A-55-94971, etc., colloidal silica is prepared by dissolving silica such as silica gel and a hydrolyzed 1.L organosilane compound in a hydrolysis catalyst such as alcohol or water. Dispersed jN'rig compositions with good wear resistance are disclosed.

However, among the above compositions, JP-A-51-273
6 and JP-A-54-87736 have a problem in that the films used in the film have poor resistance to moisture, humidity, ultraviolet rays, etc.

In addition, the composite film described in JP-A No. 55-94971, which was developed with the aim of solving these problems, has improved the water resistance etc. of the film obtained, but the heat resistance is not sufficient, and it cannot be heated. The problem is that the film tends to crack.

Furthermore, the conventional organosilane coating compositions described above usually require a long aging period, have poor storage stability, and have a short pot life. are doing. Furthermore, due to the presence of a large amount of water due to the use of colloidal silica, the surface tension of the composition becomes high, resulting in insufficient adhesion to glass substrates and the like.

In addition, in order to form a transparent film, coating conditions such as temperature and humidity must be sufficiently controlled, and these conditions are also limited to a narrow range, resulting in poor workability. It also has

On the other hand, recently, there has been an increasing demand for a matte type hard coat in addition to the above-mentioned transparent type coating composition (hard coat). Applications of this matte type hard coat include, for example, reflection IL filters for cathode ray tube displays, light transmitting plates in front of display panels, etc. that require glare prevention effects; light bulbs for indoor/outdoor lighting equipment, and fluorescent lights. Items that require a high-class appearance such as light protection boards, advertising lights, and billboards; Items that require a concealing or shielding effect such as bathroom window glass; and other items that require a light reflective city prevention effect. This refers to things that can convert a point light source into a surface light source.

Conventional [11! The transparent type of hard coating used in this film has a mirror-like luster on the surface and has excellent light transmittance. It cures the problem that characters and figures become difficult to read when applied to the surface of the screen.Also, when used as an anti-reflection filter for a CRT display, it cures the problem that characters and figures become difficult to read. It also has the problem that it is easily scratched when using a light ben etc. - When applied to frosted glass etc., when used as a window glass for a bathroom etc. for a car,
Generally, ground glass has problems in that when its surface becomes wet, its light scattering ability decreases, its concealing or shielding effect is impaired, and its shatter resistance is poor. In addition, when applied to the reflector or protection plate of lighting equipment, it may discolor or deform due to spray-type insecticides, etc. When applied to signboards, etc.,
Since the weather resistance is not sufficient, it has problems such as changing to brown or the like, which impairs the appearance.

Therefore, a coating composition suitable for coating glass or plastic molded bodies as described above and having excellent anti-glare effect, abrasion resistance, water repellency, impact resistance, chemical resistance, weather resistance, and high-grade appearance. Things have not been obtained yet.

The processing method to obtain the above-mentioned song glare film is as follows:
Conventionally, for example, a sandblasting method, a surface scratching method, and a method of incorporating silica powder or the like into a coating composition are known. Further, as a processing method for obtaining an antireflection i-coat, a method of vacuum-depositing gold, tetraoxide, etc. is known. However, among the above-mentioned methods, the sandblasting method and surface scratching method only roughen the surface precision of materials such as glass, plastic, and metal.
This does not solve any of the problems mentioned above, and other processing is required. In addition, the method of blending silica powder etc. into the coating composition has problems such as poor stability of the composition due to the silica powder coagulating and settling, and difficulty in obtaining a film with a uniform appearance. There are problems in handling and work.

Furthermore, the method of vacuum evaporating metal oxides requires a large amount of equipment and is not yet suitable for general use, and metal oxides that have sufficient adhesion to plastic substrates, etc. One problem is that it is difficult to form a film.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned problems, require almost no aging period, have excellent storage stability, make it easy to set the coating environment at the time of coating, reduce workability, and reduce the amount of time. A coating composition and a coating composition in which the resulting film has transparency or anti-glare effect, and has excellent abrasion resistance, heat resistance, impact resistance, water repellency, weather resistance, and adhesion to the substrate. This article provides the manufacturing method.

[Summary of the invention]

That is, the coating composition of the present invention has the following formula: Glopyru group, r-
Represents a monovalent hydrocarbon group selected from the group consisting of glycidoxyprobyl group, 3,4-epoxycyclohexylethyl group, and r-mercagutoprobyl group. ) Organohydroxysilane and/or a partial condensate thereof, (B) colloidal silica, C) lower aliphatic alcohol and (to) a solids content regulator, and has a solids content of 10 to 40% by weight It is characterized by this.

Further, the method for producing the coating composition of the present invention can be carried out using the following formula (1)
&5i(OR2)3 (wherein, R1 has the same meaning as above, R1 is a methyl group,
It represents one or more alkyl groups having 1 to 3 carbon atoms selected from the group consisting of ethyl and propyl groups. ) Organoalkoxysilane 1
00fi leaves are hydrolyzed in a colloidal aqueous dispersion containing 5 to 200 parts of silica, and then (11) a lower aliphatic alcohol is added to control the condensation reaction of the hydrolyzate. After azeotropically distilling off excess water, (lll) solids content regulator was added to reduce the solids content to 10~4°+5. h(% ICM”).

The present invention will be explained in more detail below.

Formula R1S of component (4) used in the present invention (・ζ
i ((Organohydroxysila denoted by ND s/
is obtained by hydrolyzing organoalkoxysilane represented by 2R'5i(OR2)3 (in the formula,
R1 and R2 have the same meanings as in Shinko 11. ). As such, organoalkoxysilanes include, for example, CH, qS i (QC)R3)3, CHsS i
(0(JJa)3, CH3S i (OCd(v
)3, CJJ, qS I(OCRs)s, CH
2””CH8i (OCHg)s, CAb=CH8i
(OCtrb)s, CaI(as i (0CH3)3
, C1CI(2cFT2cI(2S i (0CJL
)s, CFTz=(,:(CHs) CUO(C
H2)3S+C0CIJs)s, CFT
2-CH-CH2-0-(CH2)3-8 i (OC
Hs)3, \1, etc., and one or more selected from the group consisting of these are used. Among these, CHsS i (OCHs)s or CHs S
Although it is preferable to use f(OCJ(Js) from the viewpoint of product price and the hardness and abrasion resistance of the formed film, it is also possible to mix other organoalkoxysilanes.

The organohydroxysilane and/or component (a) of the present invention obtained by hydrolyzing the organoalkoxysilane described above.
Or as a partial condensate thereof, ('ylJ, CHs
Si(OH)s, C2H5Si(OH)s,
CH2= CH31(OH)s, C6H55i (
OH)s, C1CHyCH2CHzS l (OH)3
, CH2=C(CH3) -COO-(CHs)s S
Examples include organohydroxysilanes and/or partial condensates thereof represented by 1 (OH)3, etc., and one or more types selected from the group consisting of these.

Colloidal silica, component ([3)] used in the present invention is added to impart wear resistance.

The average particle size of such silica is preferably 5 to 150 mlt, more preferably 5 to 30 rnJI.

If the average particle size of silica is less than 5 mμ, it has little practical meaning; on the other hand, if it exceeds 150 m, the abrasion resistance of the resulting film decreases. It is necessary that the amount is in the range of 5 to 200 parts per loo't and tit parts of organoalkoxysilane, which is a precursor of organohydroxysilane. If the amount of silica is less than 5 parts by weight, the hardness of the resulting film will be low, while if it exceeds 200 parts by weight, the silica in the composition will aggregate or precipitate, making it difficult to obtain a stable dispersion. If the amount of silica used in this case is in the range of 5 to 50 parts by weight based on 100 parts by weight of organo-alkoxysilane, which is the precursor of organohydroxysilane, a transparent film can be obtained. is possible, and 30 to 2
When the amount is in the range of 0.00 parts by weight, it is possible to obtain a film having an anti-glare effect.

When producing the coating composition of the present invention, component (B) is used as a colloidal aqueous dispersion of silica.

Such a dispersion has a pH (hydrogen ion concentration) of 8 to 9.
The silica content in the dispersion is preferably 15 to 40% by weight, more preferably 20 to 30% by weight. pH is 8
If it is less than 9, the hardness of the resulting film will be low, while if it exceeds 9, the rate of hydrolysis of the organoalkoxysilane will be slow.

Furthermore, if the silica content in the dispersion is less than 15% by weight, the amount of water introduced into the system will increase, so the amount of water to be removed will also increase, and the production time will become longer. On the other hand, if it exceeds 40% by weight, it becomes difficult to prepare the dispersion itself.

The lower aliphatic alcohol (component 0) used in the present invention dissolves component (4) to stabilize the composition, and also azeotropically distills off excess water present in the system. (5) Added to suppress condensation of components.

Any lower aliphatic alcohol may be used as long as it is azeotropic with water, such as methanol, ethanol, propanol, isopropanol,
Examples include n-butanol and isobutanol, and one or more selected from the group consisting of these are used.

The acid component solid content regulator used in the present invention adjusts the solid content of the coating composition of the present invention to 10 to 40% by weight, and at the same time widens the range of workability and disperses the composition. It improves stability and makes it possible to obtain a transparent or non-glare film in a uniform state.

Any hydrophilic organic solvent can be used as the solid content regulator, such as methanol, ethanol, and protyanol.

lower aliphatic alcohols such as isopropanol, n-butanol, isobutanol; and ethylene glycol;
Examples include ethylene glycol derivatives such as ethylene glycol monobutyl ether and acetic acid ethylene glycol monoethyl ether, and diacetone alcohol, and one or more selected from the group consisting of these may be used. Among these, ethanol,
At least one member selected from the group consisting of inpropanol, n-butanol, isobutanol, acetic acid ethylene glycol monoethyl ether, and diacetone alcohol.
The solid content of the coating composition of the present invention is preferably from 10 to 40% by weight.
%, preferably 15 to 30% by weight. The solid content of the composition of the present invention, that is, the film-forming component is 1
If it is less than 0% by weight, it will be difficult to control the thickness of the resulting film, while if it exceeds 40% by weight, workability will decrease and the resulting film will tend to be thick and prone to cracks.

To produce the coating composition of the present invention described above, first,
The organoalkoxysilane is hydrolyzed in a colloidal aqueous dispersion of silica to obtain an organohydroxysilane. The hydrolysis conditions are as follows: the liquid temperature is maintained at 10 to 70'C, and stirring is carried out under normal pressure for 4 to 30 hours. The reaction is preferably carried out, and more preferably the reaction is carried out at a liquid temperature of 25 to 35°C for 12 to 24 hours with stirring.

Organoalkoxysilane is hydrolyzed in a colloidal dispersion of silica as described above, but at this time,
Hydrolysis catalysts such as various inorganic acids, organic acids or aluminum chelates may be used as required. Examples of such hydrolysis catalysts include hydrochloric acid, formic acid, acetic acid, acetic anhydride, chloroacetic acid, propionic acid, oxalic acid, malonic acid, dimethylmalonic acid, maleic acid, glycolic acid, glutaric acid, citric acid, and benzoic acid. ) Acids such as luenesulfonic acid and aluminum acetylacetonate, aluminum ethyl acetylacetate bisacetylacetonate, aluminum bisethylacetoacetate acetylacetonate, aluminum di-h-butoxymonoethylacetoacetate, aluminum diisopropoxide monomethylacetoacetate Examples include aluminum chelates such as nate. Among these, it is particularly preferable to use acetic acid or acetic anhydride.

The amount of the hydrolysis catalyst used is preferably 0.05 to 15 parts by weight, more preferably 0.05 to 5 parts by weight, per 100 M parts of the colloidal aqueous silica dispersion.

Then, in order to remove excess water from the colloidal aqueous dispersion of silica, a lower aliphatic alcohol is added and the condensation reaction of the hydrolyzate is azeotropically distilled off in an uncontrolled manner. Such distillation of water can be carried out, for example, by reducing the liquid temperature to 20 to 7
It is preferable to carry out the stripping by maintaining the temperature at 0°C and under reduced pressure of 20 to 300 mmHF/, more preferably, at a liquid temperature of 25 to 40°C and a pressure of 30 to 5 mmHF.
This is under the conditions of 0 pm and 9 pm.

The amount of lower aliphatic alcohol added may be sufficient to azeotropically distill off excess water originating from the colloidal aqueous dispersion of silica, and should be 211 parts by weight per 100 parts by weight of water in the dispersion. It is preferable to add a large amount of alcohol in several portions in a case where it is desired to increase the degree of water distillation. If the amount of the lower aliphatic alcohol added is less than 211 parts by weight, it will be difficult to suppress or control the condensation reaction of organohydroxysilane or its partial condensate during azeotropy, resulting in a decrease in the hardness of the resulting film. Invite.

Excess water originating from the colloidal aqueous dispersion of silica is azeotropically distilled off, and the solids content of the composition is then reduced to 10-40%.
An organic solvent is added as a solid content regulator to adjust the weight. There is no problem even if the azeotropic alcohol remains in the composition thus obtained. Also, the water content in the composition is 45! Preferably under RFjL91,
More preferably, it is 10 or less. If the water content is less than 45 fibers, the dispersion uniformity will be poor, and furthermore, a hard film will not be obtained.

The coating composition of the present invention thus obtained may further contain additives such as leveling agents, thickeners, pigments, dyes, ultraviolet absorbers, and antioxidants, and modifiers. There is no problem in using the coating composition of the present invention on a substrate to obtain a cured film, for example, the following method can be employed.

That is, the composition of the present invention can be coated onto a substrate by a commonly known method such as flow coating, spray coating, or dip coating.
It is preferable to apply it to about 0μ, more preferably,
Apply to a thickness of 2-10μ. Next, by heating at about 120°C for 60 minutes, a film with good adhesion to the substrate can be obtained.If you want to cure under milder conditions, add a portion of the composition containing the silanol condensation catalyst. This can be achieved by using Such silanol condensation catalysts include, for example, alkali metal caldates such as acetate and potassium formate; amine carboxylates such as dimethylamine acetate, ethanolamine acetate, and dimethylaniline formate; tetramethyl acetate. Quaternary ammonium carboxylates such as ammonium; metal carpinates such as tin naphthenate; amines such as trieta//l/amine and pyridine; alkali hydroxides such as sodium hydroxide and ammonium hydroxide; γ- Amine-based coupling agents such as aminopropyltriethoxysilane, γ-ethylnthoamineprobyltrimethoxysilane, and aluminum chelate compounds, and one or more selected from the group consisting of these. is used. The mixing ratio of these condensation catalysts is appropriately selected depending on the curing conditions, but it is preferably 0.05 to 0.5 times the solid content in the composition, more preferably 0. It is .08 to 0.15% by weight.

By incorporating the above-mentioned condensation catalyst, the composition of the present invention can be beneficially cured in a relatively short time at a temperature of about 75 to 150°C, making it possible to obtain a film that is transparent to non-glare and has excellent abrasion resistance. Examples of substrate materials to which the coating composition of the present invention can be applied include transparent to opaque plastics, metals, wood, leather, glass, and ceramics. Among these, examples of plastic materials include acrylic resin, preester resin, polyimide resin, polyamide resin, acrylonitrile-butadiene copolymer resin, polyvinyl chloride resin, ethylene resin, polycarbonate resin, etc. Examples of the material include aluminum, scorched chromium alloy, and the like. At this time, if adhesion to the substrate is a problem, it is possible to apply by pre-treating the surface of the substrate with a fryer. Therefore, it can be applied to the surface of almost all solid materials. It is possible to The composition of the present invention is particularly useful as a coating agent for polycarbonate resins and acrylic resins, and can form a film with extremely good adhesion, especially for acrylic resins, with a single application. It is possible.

The reason why the film formed using the coating composition of the present invention has excellent properties is thought to be that there is almost no water in the composition. In other words, it is known that increasing the silica content in the composition is sufficient to increase the hardness of the film, but when increasing the silica content in conventional compositions, the colloidal aqueous dispersion of silica Due to its use, the water content in the composition also increases. Therefore, an increase in water with high surface tension also increases the surface tension of the entire composition,
This causes a decrease in adhesion to plastic substrates, etc. In addition, the presence of excess moisture makes it difficult to control the temperature and humidity during painting to form a transparent or non-glare film, reducing the coating conditions such as appropriate temperature and humidity + 1), and reducing work efficiency. resulting in a decrease in (+j) By removing this excess water, it has become possible to solve the above problems and at the same time virtually eliminate the conventionally required aging period after preparing the composition. .

〔Effect of the invention〕

As mentioned above, the coating composition of the present invention is obtained by azeotropic distillation of excess water, so it requires almost no aging period, and its storage stability, especially at room temperature, is dramatically improved. This eliminates the short pot life, which was considered to be the biggest drawback in the past.

In addition, when applying the coating, water is distilled off and the boiling point is controlled by a combination of solid content regulators, so it is hardly affected by temperature and humidity, and there is a wide range of settings for coating conditions. It is wide and has excellent workability.

Furthermore, the resulting cured film exhibits a transparent to high-grade ground glass appearance, has excellent abrasion resistance, heat resistance, and impact resistance, and also has excellent adhesion to the substrate. .

[Embodiments of the invention]

In the following, the present invention will be explained in more detail with reference to Examples. In addition, in the following Examples and Comparative Examples, parts mean parts by weight, and Chi means weight %, respectively.

Example 1 36.7 parts of methyltriethoxysilane, 30.9 parts of colloidal silica (20% solution, trade name Nisnortex, manufactured by Nichikagaku Co., Ltd., average particle size 5-20 mμ) and acetic anhydride were added to colloidal silica. The mixture with 0.321 added,
The hydrolysis reaction was carried out for 16 to 24 hours while maintaining the temperature at 20 to 35°C and stirring.

Next, ethyl alcohol 32 was used as the azeotropic alcohol.
20-150mm at a temperature of 20-50℃
After reducing the pressure to HJ and azeotropically distilling water with ethyl alcohol to distill off excess water in the system, 50 parts of isobutyl alcohol was added as a solid content regulator to obtain coating agent 1 having a solid content of about 20%. Ta.

In the same manner as above, coating agent 2 to I got 12.

Comparative Example 1 Six types of coating agents 13 to 18 having the compositions shown in Table 1 were prepared in the same manner as in Example except that the operation of azeotropic distillation of water using an azeotropic alcohol was not performed.
I got it.

Example 2 The 18 types of coating agents obtained in Example 1 and Comparative Example 1 were applied to polycarbonate plates (trade name: NILEXAN SHEET 9030, manufactured by General Electric Company).
Pretreatment liquid (trade name: 1) H91, manufactured by Toshiba Silicone Co., Ltd.) was applied to the surface of
A cured film was obtained by heating at 0° C. for 1 hour.

For these cured films, adhesion, thermal shock resistance, hot water resistance, 1 abrasion resistance, transparency, heat resistance, and storage stability were measured under the following conditions (-2).

The results are shown in Table 2.

Adhesion: Base tape peeling test, test (average of 3 times) Thermal shock resistance Knee 30'Cx3Hr + 120°CX3Hr is one cycle, coated surface condition after bonding for 3 cycles f: Observation Hot water resistance: 500 ur in 60℃ hot water Immersion abrasion resistance: Taper abrasion, C8-10, 500kg load, ΔH% measured after 500 cycles, Visibility: Total light transmittance (dirt) Surface 1 ± Damage: 120℃ x 500Hr
Storage stability: Pot life when stored tightly at room temperature It was confirmed that the cured film had excellent properties such as hardness, hot water resistance, abrasion resistance, and heat resistance, and that the cured film was transparent and did not cause clouding. It was also confirmed that the range of coating conditions during painting was expanded and the workability was good. Furthermore, it was confirmed that the dead life, which represents the pot life when stored in a sealed container at room temperature, was more than three times as long.

Example 3 26.6 parts of methyltriethoxy 7 run, 500 parts of colloidal silica (20% solution, trade name Nisnortex, manufactured by Nichikagaku Co., Ltd., average particle size 5 to 20 mμ), and acetic anhydride were added to colloidal silica at a ratio of 0 .32 V added to the mixture, 2
The hydrolysis reaction was carried out for 16 to 24 hours while maintaining the temperature at 0 to 35°C and stirring.

Next, ethyl alcohol 2
3 parts and at a temperature of 20-50°C, 20-150
After reducing the pressure to mwTlg and distilling off excess water in the system by azeotropically distilling water with ethyl alcohol, isobutyl alcohol soM is added as a solid content regulator to reduce the solid content to approximately 20 mwTlg.
% was obtained.

In the same manner as above, the type and amount of organoalkoxy/ran, the amount of colloidal silica, and the type of azeotropic alcohol and solid content regulator H ((4 and Instead, wait for 20 to 30 minutes of coaching agent.

Comparative Example 2 Coating agent 3 of 6 f@M having the composition shown in Table 3 was prepared in the same manner as in Example 3 except that the azeotropic distillation of water using the azeotropic alcohol was not performed.
I got 1-36.

Examples A total of 18 types of coating agents obtained in Example 3 and Comparative Example 2 were treated using the same materials and conditions as in Example 2 to obtain cured films.

Regarding these cured films, the appearance, adhesion,
Thermal shock resistance, hot water resistance, scratch resistance, heat resistance, resolution, and storage stability were measured under the following conditions. Note that tests other than appearance, scratch resistance, and resolution were conducted in the same manner as in Example 2.

The results are shown in Table 4.

Appearance: Visual scratch resistance Ni steel wool - Scratch test with #0UOO A: No scratches even when rubbed hard B: Slight scratches when rubbed hard C: Easily scratched Resolution Ni Placing a painted board on a cathode ray tube display We conducted a 24-hour immersion test in various test solutions to test character reading, chemical resistance, and solvent resistance.Furthermore, as a stain resistance test, we conducted a 30-hour immersion test on various detergents, oils, cosmetics, insecticides, etc.
I wiped it down for a few minutes and checked its appearance, and the results are listed in Table 5.

As is clear from Table 4, compared to the comparative example, the coating agent of the present invention provides a uniform and high-quality ground glass appearance, has an anti-glare effect, and has good adhesion to the substrate. It was rated #'4 as having excellent thermal shock resistance, hot water resistance, hard abrasion resistance, heat resistance, etc. 4), and good resolution through the cured film. In addition, it must have excellent stability as a dispersion, a long pot life, a simple processing method, and good cropping properties. 1Pi, e was done.

Furthermore, from Table 5, it was confirmed that the chemical resistance, solvent resistance and -[(staining resistance) were excellent.

Claims (1)

[Scope of Claims] 1(A) The following formula % Formula %) (In the formula, 11 is a methyl group, an ethyl group, a vinyl group, a phenyl group, an r-chloropropyl group, a γ-methacryloxyglobin group, a γ-glyoxyglobin group, Represents a monovalent hydrocarbon group selected from the group consisting of sidoxyprobyl group, 3,4-epoxycyclohexylethyl group, and U r-mercaptopropyl group) or a partial condensation thereof body. A coating composition comprising (B) colloidal silica, (C) a lower aliphatic alcohol and a 0 solids content regulator, and having a solids content of 10 to 40% by weight. 2. The coating composition according to claim 1, wherein the silica component (B) has an average particle size of 5 to 150 m/7. 3. The coating composition according to claim 2, wherein the silica component (B) has an average particle diameter of 5 to 30 mμ. 4(1) The following formula % formula %) (wherein R1 is a methyl group, ethyl group, vinyl group, phenyl group, γ-chloropropyl group, r-methacryloxyglobyl group, r-glycidoxypropyl group, 3+4 −
Epoxycyclohexylethyl group and γ-mercaf. Represents a monovalent hydrocarbon group selected from the group consisting of toprobyl group, and R2 is one or more selected from the group consisting of methyl group, ethyl group, and globyl group, having 1 to 3 carbon atoms. represents an alkyl group having ) is hydrolyzed in a colloidal aqueous dispersion containing 5 to 200:jq of silica, and then (11) lower aliphatic alcohol is added to hydrolyze 1. After azeotropically distilling off excess water while controlling the condensation reaction of the decomposed product, (iii) adding a solid content regulator to reduce the solid content to 10-40%.
1. A method for producing a coating composition, characterized in that the coating composition is adjusted to have a uniform coating composition. 5. The method for producing a coating composition according to claim 4, wherein the organoalkoxysilane is methyltrimethoxysilane or methyltriethoxysilane. 6. The coating composition according to claim 4, which uses a hydrolysis catalyst during hydrolysis of the organoalkoxysilane! ! Construction method. 7 The content of silica in the colloidal aqueous dispersion is 15~
A method for producing a coating composition according to claim 4, wherein the content is 40% by weight. 8. The method for producing a coating composition according to claim 4, wherein the silica has an average particle size of 5 to 150 mμ. 9. A method for producing a composition for 'rrU+''U according to claim 8, wherein the average particle size of the silica is 5 to 30 mμ. 10. A method for producing a composition for 'rrU +''U according to claim 8, wherein the aqueous colloidal silica dispersion has a pH of 8 to 9. A method for producing a coating composition according to item 4, item 61.