JP2612692B2 - Coating composition - Google Patents

Description

The present invention relates to a coating composition and a method for producing the same, and more particularly to stainless steel, aluminum, ceramics, concrete, cement, fiber, wood,
Form a hard film on the surface of paper, slate, glass, plastic, etc., and also on the surface of organic or inorganic coatings, weather resistance, water resistance, water boiling water resistance, water repellency, heat resistance, water resistance TECHNICAL FIELD The present invention relates to a coating composition having excellent storage stability useful for protecting such a substrate, which has properties, chemical resistance, solvent resistance, stain resistance, adhesion, and the like, and a method for producing the same.

[Conventional technology]

Conventionally, as a coating composition, a film thickness of 10
0μm or less thin film, excellent in weather resistance, water resistance, boiling water resistance, water repellency, heat resistance, water permeability, chemical resistance, solvent resistance, stain resistance, storage stability, adhesion, etc., and low There is a need for a coating composition that can form a coating film having high hardness at low cost.

Examples of organosilane-based coating compositions that satisfy some of these requirements include, for example, JP-B-52-3969, JP-B-53-5042, and JP-A-54-877366.
The compositions proposed in JP-A-55-94971 and JP-A-59-68377 can be exemplified.

[Problems to be solved by the invention]

However, all of the coating compositions described in the above publication use colloidal silica using water as a dispersion medium, so that a large amount of water is present in the composition, and hydrolysis and polycondensation occur. Is too fast, and the storage stability is poor. In addition, when containing a large amount of water, it is difficult to obtain a composition in a stable form to promote gelation, and the resulting coating film has weather resistance, water resistance, boiling water resistance, stain resistance, and the like. It has caused deterioration.

The present invention has been made in view of the above-mentioned problems of the prior art, and does not require an aging period, has excellent storage stability, and has excellent weather resistance, water resistance, boiling water resistance, and repellency. An object of the present invention is to provide a coating composition having aqueous properties, heat resistance, water permeability, chemical resistance, solvent resistance, stain resistance, high hardness and adhesion to a substrate, and a method for producing the same.

[Means for solving the problem]

That is, the present invention provides: (a) a compound represented by the general formula RSi (OR ') ₃ (wherein R is a group having 1 to 8 carbon atoms)
Represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 4 carbon atoms. A) a condensate of an organoalkoxysilane represented by the following formula, wherein the organosiloxane having a weight-average molecular weight in terms of polystyrene of from 500 to 5,000 measured by gel permeation chromatography (GPC) is added to 100 parts by weight in terms of organoalkoxysilane. (B) 5 to 50 parts by weight of a colloidal silica dispersed in a hydrophilic organic solvent (hereinafter simply referred to as "colloidal silica") in terms of solid content, (c) 0.1 to 50 parts by weight of water, (d) A hydrophilic organic solvent (including the hydrophilic organic solvent present in the component (b)) in an amount of 100 to 1,000 parts by weight, and (e) an amine silane coupling agent in an amount of 0.3 to 15 parts by weight. To provide a coating composition.

 First, the composition of the present invention will be described in detail for each constituent element.

(A) Organopolysiloxane (a) Organopolysiloxane is represented by (a) ′ general formula RS
It is obtained by hydrolyzing and polycondensing an organoalkoxysilane represented by i (OR ') ₃ , and functions as a binder in the composition obtained in the present invention.

R in the organoalkoxysilane has 1 carbon atom.
To 8 organic groups, for example, a methyl group, an ethyl group,
Propyl group, alkyl group such as i-propyl group, other γ-chloropropyl group, vinyl group, 3,3,3-trifluoropropyl group, γ-glycidoxypropyl group, γ-methacryloxypropyl group, γ- Mercaptopropyl group, phenyl group, 3,4-epoxycyclohexylethyl group, γ
-Aminopropyl group and the like.

R 'in the organoalkoxysilane is an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, an i-
Examples include a propyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, and an acetyl group.

Specific examples of these organoalkoxysilanes include methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, i-propyltrimethoxy Silane, i-propyltriethoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3, 3,3-trifluoropropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane,
γ-glycidoxypropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, phenyltrimethoxysilane, phenyl Triethoxysilane, γ-aminopropyltrimethoxysilane, 3,4-epoxycyclohexylethyltrimethoxysilane, 3,4-epoxycyclohexylethyltriethoxysilane and the like can be mentioned, but methyltrimethoxysilane and methyltrimethoxysilane are preferred. It is ethoxysilane.

These organoalkoxysilanes can be used alone or in combination of two or more.

(A) ′ Of the organoalkoxysilane represented by the general formula RSi (OR ′) _3, at least 80 mol% of CH ₃ Si (O
R ') ₃ is preferred.

The organoalkoxysilane releases an alcohol by hydrolysis in an acidic aqueous medium and causes polycondensation to produce an organopolysiloxane.

The weight average molecular weight in terms of polystyrene of the organopolysiloxane is 500 to 5,000, preferably 700 to 3,000, and if it is less than 500, the resulting coating film is liable to crack, and the weather resistance, water resistance, stain resistance and the like are deteriorated. On the other hand, if it exceeds 5,000, the curing of the coating film tends to be insufficient, so that the hardness of the obtained coating film is lowered and the chemical resistance is deteriorated.

(B) Colloidal silica (b) Colloidal silica is used for increasing the solid content while maintaining the transparency of the composition of the present invention,
The thickness of the coating film obtained depends on the amount of the component.

Here, the colloidal silica is a dispersion in which high-purity silicic anhydride is dispersed in a hydrophilic organic solvent described below, and usually has an average particle size of 5 to 30 mμ, preferably 10 to 20 mμ, and a solid content concentration of It is about 10 to 40% by weight.

The water content in this colloidal silica is 4% by weight
Or less, particularly preferably 2% by weight or less. That is, if the water content in the colloidal silica exceeds 4% by weight, the amount of water as the component (c) becomes relatively large, and a precipitate may be easily formed in the composition.

As such colloidal silica, for example, Nissan Chemical Industry Co., Ltd., isopropanol silica sol and methanol sol; Catalyst Chemical Industry Co., Ltd., Oscar, etc. are commercially available.

The proportion of the above-mentioned (b) colloidal silica in the composition is 5 to 50 parts by weight, preferably 10 to 40 parts by weight in terms of solid content, based on 100 parts by weight of the component (a).
When the amount is less than 50 parts by weight, it is difficult to achieve a thick film obtained by coating, and the hardness is low.On the other hand, when the amount is more than 50 parts by weight, a thick film is easily obtained, but the coating film is cracked. And the weather resistance and water resistance deteriorate.

(C) Water (c) Water is an essential component for the hydrolysis of the organoalkoxysilane used in the component (a) ′,
It serves as a dispersion medium for the component (b). As such water, general tap water, distilled water, ion-exchanged water and the like can be used. In particular, when making the composition of the present invention highly pure, distilled water or ion-exchanged water is preferable.

(C) The proportion of water in the composition is as follows:
0.1 to 50 parts by weight, preferably 1 to 30 parts by weight with respect to parts by weight, and when less than 0.1 part by weight, hydrolysis becomes insufficient, and the coating film is sufficiently cured even when coated with the obtained composition. On the other hand, if it exceeds 50 parts by weight, the storage stability of the composition is lowered, which is not preferable.

(D) Hydrophilic organic solvent (d) The hydrophilic organic solvent contains the hydrophilic organic solvent present in the component (b), mainly mixes the components (a) to (b) uniformly, and (a) The present invention is applicable to various coating methods at the same time as adjusting the concentration of the component (b) to adjust the solid content of the composition of the present invention, thereby improving the dispersion stability and storage stability of the composition.

As such a hydrophilic organic solvent, alcohols or low-boiling-point hydrophilic organic solvents having a boiling point of 120 ° C. or less are suitable.

Examples of the alcohols include monohydric alcohols, dihydric alcohols, and glycol derivatives. Among them, the monohydric alcohol is preferably a saturated aliphatic alcohol having 1 to 8 carbon atoms.

Specific examples of these alcohols include methanol, ethanol, n-propyl alcohol, i-propyl alcohol, sec-butyl alcohol, tert-butyl alcohol, ethylene glycol, diethylene glycol, triethylene glycol, ethylene glycol monobutyl ether, and acetic acid. Examples include ethylene glycol monoethyl ether.

Examples of the low-boiling hydrophilic organic solvent having a boiling point of 120 ° C. or lower include acetone, methyl ethyl ketone, and tetrahydrofuran.

Of these hydrophilic organic solvents, preferably i-propyl alcohol, sec-butyl alcohol, n-propyl alcohol, n-butyl alcohol, diethylene glycol, alcohols such as ethylene glycol monoethyl ether acetate and glycol derivatives, especially Preferred are i-propyl alcohol and ethylene glycol monoethyl ether acetate.

These hydrophilic organic solvents can be used alone or in combination of two or more.

The proportion of (d) the hydrophilic organic solvent in the composition is 100 to 1,000 parts by weight, preferably 150 to 100 parts by weight of the component (a).
When the amount is less than 100 parts by weight, the dispersibility of (a) the organopolysiloxane and other fillers used as required, which will be described later, is deteriorated, the storage stability is deteriorated, and the composition obtained is The viscosity of the product becomes too high to obtain a uniform coating film, while if it exceeds 1,000 parts by weight, other components are relatively reduced, and the coating film formed by subjecting the obtained composition to coating is It is too thin to obtain a desired coating film.

In addition, as described above, other fillers can be added to the composition of the present invention as needed.

Such fillers are insoluble in water and include, for example, pigments such as organic or inorganic pigments. Also, particulate or fibrous metals and alloys other than pigments and their oxides, hydroxides, carbides,
Specific examples include nitrides, sulfides, and other particulate or fibrous iron, copper, aluminum, nickel, silver, zinc, ferrite, carbon black, stainless steel, silicon dioxide, titanium oxide, aluminum oxide, chromium oxide, and manganese oxide. , Iron oxide, zirconium oxide, cobalt oxide,
Examples include, but are not limited to, synthetic mullite, zircon (zirconia silicate), aluminum hydroxide, iron hydroxide, silicon carbide, silicon nitride, boron nitride, molybdenum disulfide, and the like. The average particle size or average length of these fillers is usually 0.05 to 50 μm, preferably 0.1 to 5 μm, and if it is less than 0.05 μm, the viscosity of the composition increases, while if it exceeds 50 μm, the resulting composition has Dispersibility deteriorates.

The proportion of the other filler used in the composition as needed is usually 50 to 500 parts by weight per 100 parts by weight of the component (a).
Parts by weight, preferably 80 to 300 parts by weight, and if it is less than 50 parts by weight, the filler cannot sufficiently exhibit the performance imparted to the composition, and also achieves the purpose of an anticorrosion film, a decorative film, etc. On the other hand, if it exceeds 500 parts by weight, the obtained composition may gel, the hardness of the coating film obtained by subjecting to coating deteriorates and the adhesion to the substrate deteriorates, Workability also worsens.

In addition, the selection of other fillers used as needed is performed based on, for example, the following selection depending on the purpose of the coating film to be obtained.

As the filler for forming the anticorrosion film, a material having excellent corrosion resistance, such as silicon dioxide, titanium oxide, aluminum oxide, chromium oxide, zirconium oxide, synthetic mullite, zircon, silicon carbide, and silicon nitride is used.

As a filler for forming the electric insulating film, an electric insulating metal oxide, carbide or nitride containing no alkali metal is used.

As a filler for forming a decorative film, an oxide such as iron oxide, titanium dioxide, cobalt oxide, zinc oxide, tin oxide, lead oxide, and aluminum oxide is used.

As a filler for forming the heat radiation film, an oxide such as iron oxide, copper oxide, cobalt oxide, manganese oxide, chromium oxide, silicon dioxide, titanium oxide, aluminum oxide, or zircon is used.

Fillers for making conductive films and semiconductive films include:
Copper, aluminum, nickel, silver, carbon black,
Use tin oxide or the like.

As a filler for forming the heat insulating film, a metal oxide, a hydroxide, a nitride, or the like having a low thermal conductivity is used.

Zinc, lead, chromium, or the like is used as a filler for forming a rust prevention film.

In addition, in order to form a coating film utilizing characteristics of various fillers, two or more of the above-mentioned fillers can be used in combination.

Further, to the composition of the present invention, (e) an amine-based silane coupling agent is added in addition to the filler to promote the curing of the composition, that is, at room temperature or at 100 ° C.
The coating film can be cured at a low temperature of not more than ℃.

As the (e) amine-based silane coupling agent, γ-aminopropyltriethoxysilane, γ- (2
-Aminoethyl) -aminopropyltrimethoxysilane, γ- (2-aminoethyl) -aminopropylmethyldimethoxysilane, γ-anilinopropyltrimethoxysilane and the like. The proportion of this (e) amine-based silane coupling agent in the composition is:
(A) Usually, 0.3 to 15 parts by weight with respect to 100 parts by weight of the component,
It is preferably 1.0 to 10 parts by weight, and if it is less than 0.3 part by weight, curing at room temperature or low temperature drying at 100 ° C. or less is insufficient, while if it exceeds 15 parts by weight, storage stability is deteriorated, and use of the composition Possible time is shortened.

Further, the composition of the present invention has a pH of usually from 2.5 to 6.5, preferably from 3 to 5, in order to accelerate the curing of the coating film after coating while maintaining the storage stability of the composition before application.
It is desirable to adjust to 6. Such pH adjustment can be achieved by separately adding various acids to the composition, if necessary.

Such acids include, for example, inorganic acids such as nitric acid and hydrochloric acid,
Or acetic acid, formic acid, propionic acid, maleic acid, chloroacetic acid, citric acid, benzoic acid, dimethylmalonic acid, glutaric acid, glycolic acid, malonic acid, toluenesulfonic acid,
Organic acids such as acids can be mentioned, and acetic acid is particularly preferred.

Furthermore, the composition of the present invention includes various surfactants, silane coupling agents other than the above, a titanium coupling agent,
Further, other additives such as alkali metal salts such as naphthenic acid, octylic acid, nitrous acid, sulfurous acid, aluminate, and carbonic acid, and dyes may be added.

The composition of the present invention containing the components (a) to (d) as described above is first represented by (a) a general formula RSi (OR ') ₃ which is a starting material of the component (a). (B) 5 to 50 parts by weight of colloidal silica in terms of solid content, (c) 5 to 55 parts by weight of water, and (d) 15 to 500 parts by weight of a hydrophilic organic solvent, based on 100 parts by weight of the organoalkoxysilane to be used. Parts by weight to carry out hydrolysis and polycondensation, and convert the organoalkoxysilane (a) ′ component into an organopolysiloxane having a polystyrene equivalent weight average molecular weight of 500 to 5,000,
(B) If necessary, water and / or component (c)
Alternatively, it is produced by further adding a hydrophilic organic solvent as the component (d) to make the total amount of the component (c) 0.1 to 50 parts by weight and the total amount of the component (d) 100 to 1,000 parts by weight. be able to.

Also, the amount of the component (d) added in the step (a) is
If the amount exceeds 500 parts by weight with respect to 100 parts by weight of the component (a) ', the amount of the hydrophilic organic solvent relatively increases too much, so that the hydrolysis and polycondensation of the organoalkoxysilane (a)' are delayed. The reaction for obtaining the composition requires a long time, which is not preferable.

The molar ratio of the component (c) / the component (a) 'in the step (a) is preferably from 1.5 to 5. When the molar ratio is less than 1.5, hydrolysis and polycondensation hardly proceed. Storage stability may decrease.

In the step (a), usually, the components (a) ′ to (d) are mixed and the temperature is 10 to 90 ° C., preferably, with stirring.
A composition containing (a) an organopolysiloxane having a weight average molecular weight of 500 to 5,000 in terms of polystyrene, which is carried out under the conditions of 20 to 80 ° C. and a reaction time of 1 to 10 hours, preferably about 2 to 8 hours. Is obtained.

According to the method for producing the composition of the present invention, the component (c) and / or the component (d) are additionally added as necessary in the step (b).

That is, in the step (b), after completion of the hydrolysis and the polycondensation in the step (a), the produced (a) organopolysiloxane is further hydrolyzed and polycondensed during storage to suppress the increase in the molecular weight. In addition, it has an effect of further adjusting the solid concentration of the entire composition.

The amount of the component (d) added in the step (b) is
The (a) 'component is added in an amount of 0 to 970 parts by weight based on 100 parts by weight of the component, so that the total amount of the component (d) is 100 to 1,000 parts by weight.

In the method for producing the composition of the present invention, when the other filler used as necessary, or an amine-based silane coupling agent or the like is further blended,
The following manufacturing method may be employed in accordance with the above manufacturing method.

That is, the components (a) 'to (d) and the filler are mixed, the step (a) is carried out, and then the step (b)
At the time of the process, (e) an amine silane coupling agent is added.

Alternatively, the filler and / or the amine silane coupling agent (e) may be separately added in the step (b) after mixing the components (a) (a) 'to (d).

The coating composition of the present invention is a metal, stainless steel, ceramics, concrete, cement, slate, glass, plastic, fiber, wood, paper or other base material as an object, or an organic or inorganic coating film The surface of the product is dried at a temperature of about 20 to 100 ° C. for about 5 minutes to 24 hours by using a coating means such as brush, spray, dipping, etc.
m, preferably about 3 to 20 μm. When a filler is contained, a coating of 5 to 100 μm, preferably about 10 to 80 μm can be formed.

〔Example〕

Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples.

In the examples, parts and% are by weight unless otherwise specified.

In addition, gel permeation chromatography (GP
The measurement of the weight average molecular weight in terms of polystyrene by the method C) and various measurements in the examples are as follows.

The measurement by the GPC method was performed using tetrahydrofuran as a solvent under the following conditions,
1 g was dissolved in 100 cc of tetrahydrofuran to prepare a sample. The standard polystyrene used was Standard Polystyrene manufactured by Pressure Chemical Co., USA.

Apparatus: Waters, USA, high-temperature high-speed gel permeation chromatogram (model 150-C ALC / GPC) Column: Showa Denko KK, SHODEX A-8M, length 50 cm Measurement temperature; 40 ° C. Flow rate: 1 cc / min The property was determined by performing a cross-cut test according to JIS K5400, performing a tape peeling test three times, and averaging the results.

For water resistance, the coating film was immersed in tap water at room temperature for 60 days, and the state of the coating film was observed.

The boiling water resistance was measured by boiling in tap water for 24 hours and observing the state of the coating film.

 The hardness was based on pencil hardness according to JIS K5400.

For the weather resistance, an irradiation test was performed with a sunshine weather meter for 5,000 hours according to JIS K5400, and the state of the coating film was observed.

 The permeation resistance measured the amount of permeation according to JIS A6910.

Regarding the stain resistance, the appearance of wiping after attaching a neutral detergent and an insecticide and the appearance of wiping with ethanol after attaching an oil-soluble ink were observed.

For solvent resistance and chemical resistance, 1 ml of various test liquids were dropped on the coating film, allowed to stand in a petri dish with a lid for one day, washed with water, and the state of the coating film was observed.

The storage stability was determined by storing in a polyethylene bottle at room temperature in a sealed stopper, visually judging the presence or absence of gelation, and measuring the time for gel generation.

In addition, the criterion measured by the said test method was based on the following symbol.

；: No abnormality Δ: Partial peeling, rust generation, erosion, contamination, etc. were observed.

C: Almost or all of the film was peeled, rusted, eroded, stained, etc.

Example 1 In a reactor equipped with a reflux condenser and a stirrer, (a) 25 parts of methyltrimethoxysilane and (b) methanol-dispersed colloidal silica (solid content: 30%, Nissan Chemical Industries, Ltd.)
10 parts of methanol sol) and 6 parts of (c) tap water, and the mixture was heated to 70 ° C. and reacted for 2.5 hours.
-45 parts of propyl alcohol and 0.4 parts of γ-aminopropyltriethoxysilane were added to obtain a coating composition.

By the same operation as described above, the type and amount of the organoalkoxysilane, the amount of colloidal silica, the type and amount of the hydrophilic organic solvent, the reaction temperature and the reaction time, and the type and amount of the amine-based silane coupling agent were changed to the fourth. Changed as shown in the table, coating composition
I got

Further, 45 parts of zirconium silicate and 6 parts of titanium dioxide were added to 85.5 parts of the coating composition to obtain a coating composition.

Comparative Example 1 A coating composition having the composition shown in Table 1 was obtained in the same manner as in Example 1.

Test Example 1 The coating composition obtained in Example 1 and the coating composition obtained in Comparative Example 1 were each dried to a thickness of 10 μm using an air spray gun on test pieces A to C below. And apply
A cured coating film was formed at room temperature or at a low temperature of 100 ° C. or lower.

 Table 2 shows the results.

Test piece A; Slate plate (JIS A5430) Test piece B; Test piece G coated with a coating composition with a dry film thickness of 40 μm and heat-treated at 100 ° C for 10 minutes Test piece C; Test piece G inorganic coating A composition for use [Glaska G1100, manufactured by Nissan Laboratories Co., Ltd.] applied in a dry film thickness of 40 μm and heat-treated at 150 ° C. for 30 minutes As is clear from Table 2, the present invention has a greater effect than the comparative example. The coating composition cures at room temperature or at a low temperature of 100 ° C or less, and has excellent adhesion, water resistance, boiling water resistance, hardness, weather resistance, water resistance, stain resistance, solvent resistance, and chemical resistance.
It was confirmed that the storage stability was as long as 24 hours or more.

Test Example 2 A coating film was formed in the same manner as in Test Example 1 except that the test pieces were changed to the following test pieces D to F in Test Example 1.

 Table 3 shows the results.

Test piece D; Aluminum plate (JIS H4000, A1050P) Test piece E; Test piece J coated with a coating composition at a dry film thickness of 40 μm and heat-treated at 100 ° C for 10 minutes Test piece F; Test piece J A composition for inorganic coating (Glaska G1100, manufactured by Nissita Laboratories Co., Ltd.) coated at a dry film thickness of 40 μm and heat-treated at 150 ° C. for 30 minutes As is clear from Table 3, compared with the comparative example, The coating composition of the present invention is excellent in adhesion, water resistance, boiling water resistance, hardness, weather resistance, heat resistance, stain resistance, solvent resistance, chemical resistance, and storage stability as long as 24 hours or less. It was confirmed that it was.

[Effects of the Invention] The coating composition of the present invention uses colloidal silica containing a hydrophilic organic solvent as a dispersion medium, and the organopolysiloxane (a) has a weight average molecular weight in terms of polystyrene of 500 to 5,000. The storage stability is dramatically improved without the need for an aging period. Moreover, the coating film obtained from the composition of the present invention has high hardness,
It has a transparent and glossy appearance, has excellent weather resistance, water resistance, boiling water resistance, water repellency, heat resistance, water resistance, chemical resistance, solvent resistance, stain resistance, and It also has excellent adhesion to the substrate. Also, those containing fillers as necessary, depending on the type of filler added, heat resistance,
Corrosion protection with excellent water resistance, seawater resistance, organic chemical resistance, acid resistance, alkali resistance, heat and light absorption and radiation, abrasion resistance, weather resistance, moisture resistance, penetration resistance, adhesion, storage stability, etc. Film, electric insulation film, decorative film, heat radiation film, rust prevention film, conductive film,
Various functional films such as semiconductor films can be formed.

Further, since the amine silane coupling agent is added to the composition of the present invention, the composition can be cured at room temperature or at a low temperature of 100 ° C. or lower.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kinji Yamada 2--11-24 Tsukiji, Chuo-ku, Tokyo Japan Synthetic Rubber Co., Ltd. (72) Inventor Masaki Nagata 2-11-24 Tsukiji, Chuo-ku, Tokyo Japan Synthetic Rubber Co., Ltd. (56) References JP-A-60-219234 (JP, A) JP-A-61-53365 (JP, A)

Claims (1)

(57) [Claims] (A) a compound represented by the general formula: RSi (OR ') _{3 wherein} R is an organic group having 1 to 8 carbon atoms, R' is an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 4 carbon atoms; Is a condensate of an organoalkoxysilane represented by the following formula: which is an organopolysiloxane having a weight average molecular weight of 500 to 5,000 in terms of polystyrene measured by a gel permeation chromatography (GPC) method, in terms of organoalkoxysilane. (B) 5 to 50 parts by weight of colloidal silica dispersed in a hydrophilic organic solvent in terms of solid content, (c) 0.1 to 50 parts by weight of water, (d) hydrophilic organic solvent ( (B) containing 100 to 1,000 parts by weight of a hydrophilic organic solvent present in the component) and (e) 0.3 to 15 parts by weight of an amine silane coupling agent.