JP2001181554A - Antifouling coating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antifouling coating composition which yields an antifouling coated film which exerts a hydrophilicity at its surface immediately after it is formed, has a soilreleasing effect and therefore washes away pollutants, exerts an excellent resistance to penetration of oil stains and shows good weather resistance and other physical properties of coated films. SOLUTION: The antifouling coating composition contains (A) against 100 pts.wt. resin solid content of an acrylic copolymer resin which contains an acrylate and/or methacrylate monomer and has a glass transition temperature of from 0 to 100 deg.C, (B) from 1 to 30 pts.wt., expressed in terms of SiO2, at least one selected from alkyl silicates and their condensates and (C) from 0.1 to 20 pts.wt., calculated as the solid content, alkoxy silane compound which has from 2 to 40 repeating units, contains an alkylene oxide chain and has a weight average molecular weight of from 150 to 3,500.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-staining paint composition used for surface finishing of various materials such as metal, glass, porcelain tile, concrete, siding board, extruded board, and plastic.

[0002]

2. Description of the Related Art Recently, in a situation where oily pollutants are floating in the air due to exhaust gas from automobiles or the like in a city center or a suburban area, these oily pollutants have been painted with a building paint. When adhered to the paint film surface of a building, significant soot-like or streak-like contamination (hereinafter referred to as “rain streak”) occurs, and the paint finish applied to improve the cityscape does not make sense. There was a case.

[0003] On the other hand, various non-contamination type paints have been published which make the surface of the coating film hydrophilic and remove the adhered oily contaminants by the action of rainwater during rainfall spreading on the coating film surface. I have.

[0004] For example, Japanese Patent Application Laid-Open No. Hei 4-370176 discloses that a segmented polymer containing a hydrophilic segment such as a polyalkylene oxide segment and a hydrophobic segment such as a polysiloxane is included in a coating material so that the surface of the coating film becomes hydrophobic. Some of them are expected to provide the property and the hydrophilic property at the same time, to suppress the adhesion of pollutants and the cleaning effect by rainfall. Since the surface of the coating film is hydrophilic, water due to precipitation or the like permeates and flows into the interface between the coating film and the contaminant, and an effect of washing away the contaminant together with the water (soil release effect) is obtained. However, in reality, when water is present on the surface of the coating film, it becomes hydrophilic, but when there is no opportunity to come in contact with water for a long time (immediately after forming the coating film, etc.), it becomes hydrophobic and becomes wet during rainfall. There is a problem that it takes some time for the membrane surface to change from hydrophobic to hydrophilic.

On the other hand, Japanese Patent Application No. 6-506632 (International Publication No. WO94 / 06870) discloses that a coating is mixed with an organosilicate, and the reaction of the mixture is used to impart both hydrophilicity to the coating film surface and improvement in hardness. The intended method is shown. Generally, organosilicates undergo a hydrolysis reaction in the presence of an acid and a condensation reaction between silanol groups. Silanol groups and siloxane bonds generated by such a reaction cause hydrophilicity of the coating film surface. Therefore, in order to make the surface of the coating film hydrophilic and improve the hardness, the hydrolysis reaction due to the presence of the acid catalyst in the first stage is rate-determining, but in the above coating material, in order to advance the reaction of the organosilicate. , Acid and other surface treatments are required. Considering the actual painting on the building outer wall, the reaction is thought to proceed due to acid rain, etc., but as described above, a considerable amount of time is required after the coating is formed in order to obtain the hydrophilic surface necessary for fully exhibiting the soil release effect. Requires a long time.

[0006]

Among the coating films formed by the conventional non-staining type paints, those which require a long period of time to make the surface hydrophilic are those which have a low non-staining property in the early stage after the formation of the coating film. From the low level, rain streaks and the like are generated in a very short time after the completion of the painting work. Originally, the effect of not contaminating non-contamination type paint is to make the effect, and the user who uses it and the client who requests the painting work are expecting the effect. Therefore, even in the early stage after the formation of the coating film, the occurrence of stains, even if temporarily, betrays the expectations of these users and owners, and gives anxiety to the long-term non-staining effect. It will be. Furthermore, conventional non-contamination paints have the main purpose of flowing down contaminants due to rainfall, and have poor infiltration resistance of dirt once adhered.If there is no rainfall for a long period of time, oily dirt will be present in the coating film. It has been found that the water has penetrated, leaving dirt which is difficult to flow down due to rainfall.

[0007] The problem to be solved by the present invention is that the coating does not become hydrophilic for the first time due to the action that occurs after the formation of the coating, such as rainfall, but the surface exhibits hydrophilicity immediately after the coating is formed. A non-staining paint composition that has a soil release effect to wash away contaminants, has excellent resistance to penetration of oily stains, and provides a non-staining type coating film with good weather resistance and other coating properties. It is to get.

[0008]

Means for Solving the Problems The present invention relates to the following non-staining paint composition. 1. (A) It contains an acrylate and / or methacrylate monomer and has a glass transition temperature of 0 to 100.
With respect to 100 parts by weight of the resin solid content of the acrylic copolymer resin at a temperature of 100 ° C., (B) a general formula:

Embedded image (R ₁ to R ₄ is an alkyl group having 1 to 3 carbon atoms, may be different it may be the same) at least one of SiO ₂ in terms of the alkyl silicate or condensates thereof represented by 1 0.1 to 20 parts by weight of a solid content of an alkoxysilane compound having a weight average molecular weight of 150 to 3500, containing 30 to 30 parts by weight and (C) an alkylene oxide chain having 2 to 40 repeating units. A non-staining paint composition characterized by the following: 2. As the alkyl silicate, at least one selected from tetramethyl silicate and tetraethyl silicate is used. A non-staining paint composition according to claim 1. 3. (C) The alkylene oxide chain of the alkoxysilane compound is an ethylene oxide chain. Or 2.
A non-staining paint composition according to claim 1.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on its embodiments. (A) Acrylic copolymer resin (A) Acrylic copolymer resin (hereinafter referred to as “A”) in the present invention.
"Component (A)") is an acrylate ester and / or
Alternatively, an acrylic copolymer resin containing a methacrylic acid ester monomer and having a glass transition temperature of 0 to 100 ° C is used.

As the component (A) in the present invention, one selected from the following monomers as appropriate, combined, copolymerized, and dissolved and / or dispersed in a non-aqueous solvent is used. At this time, the monomers are selected such that at least one or more of the monomers to be selected are acrylate and / or methacrylate monomers.

Raw material monomers Methyl acrylate, ethyl acrylate, n-acrylate
Propyl, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate,
2-ethylhexyl acrylate, methyl methacrylate,
Ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, n-hexyl methacrylate, n-octyl methacrylate, n-dodecyl methacrylate, methacrylic acid Lauryl, styrene, vinyl acetate, acrylonitrile, acrylic acid, methacrylic acid, maleic acid, itaconic acid, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, acrylamide, N-
Examples include methylol acrylamide, glycidyl methacrylate, and VeoVa.

As the non-aqueous solvent for dissolving and / or dispersing the component (A), general organic solvents can be used.
Examples include aliphatic hydrocarbon solvents, aromatic hydrocarbon solvents, esters, ketones and the like. One or more of such non-aqueous solvents may be used in combination.

As the component (A), among the above-mentioned acrylic copolymer resins, those having a glass transition temperature of 0 to 100 ° C. are used. When the glass transition temperature becomes 0 ° C or lower,
This is not preferable because tackiness called tackiness occurs on the surface of the coating film, causing physical adhesion of contaminants and losing stain resistance. Conversely, if the temperature is higher than 100 ° C., the hardness of the formed coating film is increased, and the surface is undesirably cracked on the surface with the passage of time.

(B) Alkyl silicate (B) used in the present invention, a general formula:

Embedded image (Where R _{1 to} R ₄ are alkyl groups having 1 to 3 carbon atoms, which may be the same or different), or a condensate thereof (hereinafter referred to as “component (B)”). Is, for example, 1 selected from tetramethyl silicate, tetraethyl silicate, tetra-n-propyl silicate, tetra-i-propyl silicate
Examples of the condensate include one or more selected from those obtained by condensing the above tetraalkyl silicate under hydrolysis conditions. In particular, at least one of tetramethyl silicate and tetraethyl silicate
The use of seeds or condensates thereof is preferred from the viewpoint of the balance between flexibility and denseness of the formed coating film. The condensation degree of the condensate is preferably 20 or less, and when the condensation degree is 20 or more,
It is not preferable because the viscosity of the condensate increases, handling becomes inconvenient, compatibility with the component (A) deteriorates, and gloss of the coating film decreases.

The mixing ratio of the component (B) is 1% in terms of SiO _{2 with} respect to 100 parts by weight of the resin solid content of the component (A).
An appropriate amount is 30 to 30 parts by weight, preferably 3 to 10 parts by weight. If the amount is less than 1 part by weight, the hydrophilicity of the coating film is not sufficient, so that the stain resistance is inferior. If the amount exceeds 30 parts by weight, there arises a problem that the appearance of the cured coating film deteriorates and cracks occur. That's why.

Here, in terms of SiO _{2, a} compound having a Si—O bond such as an alkoxysilane or a silicate is completely hydrolyzed, and when calcined at 900 ° C., it becomes silica (SiO ₂ ). It is expressed in minutes. In general, alkoxysilanes and silicates have a property of reacting with water to cause a hydrolysis reaction to form silanol, and to further cause a condensation reaction between silanols or silanol and alkoxy. When this reaction is performed to the ultimate, it becomes silica (SiO ₂ ). These reactions are represented by the following formula:

Embedded image This is a conversion formula of the amount of the remaining silica component based on this reaction formula.

The actual calculation is

(Equation 1) The equation was used.

(C) Alkoxysilane Compound Containing Alkylene Oxide Chain The (C) alkoxysilane compound having an alkylene oxide chain (hereinafter referred to as “component (C)”) used in the present invention is a repeating unit of an alkylene oxide group. And a compound having at least one or more alkoxysilyl groups. In the alkylene oxide group repeating unit of the component (C), the alkylene portion has 2 to 4 carbon atoms, the repeating number is 2 to 40,
Preferably it is 2-20.

The component (C) may have an alkoxysilyl group at both ends and may have an alkoxysilyl group at one end and another functional group at the other end. Examples of such a functional group that can be present at one end include, for example,
Examples include a vinyl group, a hydroxyl group, an epoxy group, an amino group, an isocyanate group, and a mercapto group. The functional group may be bonded to an alkoxysilyl group via a urethane bond, a urea bond, a siloxane bond, an amide bond, or the like. As such a component (C), for example, a compound synthesized by reacting a compound containing a polyalkylene oxide chain with a compound containing an alkoxysilyl group (hereinafter, referred to as a coupling agent) can be used.

The compound having a polyalkylene oxide chain preferably has a molecular weight of 150 to 3500,
1500 is more preferred. When the molecular weight is less than 100, the cured coating film finally obtained is inferior in hydrophilicity, cannot provide a cleaning effect of contaminants due to rainfall, and has a molecular weight of 3500.
If the ratio exceeds the above range, the water resistance and hardness of the coating film decrease. As such a polyalkylene oxide chain-containing compound,
Polyethylene glycol, polyethylene-propylene glycol, polyethylene-tetramethylene glycol,
Examples include polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, polyoxyethylene diglycolic acid, polyethylene glycol vinyl ether, polyethylene glycol divinyl ether, polyethylene glycol allyl ether, and polyethylene glycol diallyl ether. The polyalkylene oxide chain-containing compound can be selected from one kind or a combination of two or more kinds.

On the other hand, the coupling agent is, for example, a compound having at least one or more alkoxysilyl groups and other substituents in one molecule. Specific examples of the coupling agent include β- (3,4 epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane, N-β (Aminoethyl) γ-aminopropylmethyldimethoxysilane, N-
β (aminoethyl) γ-aminopropylmethyltrimethoxysilane, γ-aminopropyltrimethoxysilane,
γ-aminopropyltriethoxysilane, isocyanate-functional silane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-methacryloxypropyltriethoxysilane, and the like.

The synthesis of the component (C) is not particularly limited, but a polyalkylene oxide chain-containing compound and a coupling agent are separately prepared. For example, for each compound having a polymerizable double bond, a radical polymerization initiator is used. In addition to copolymerization using an amino group, it can be synthesized by a known method such as an addition reaction of an amino group / epoxy group, an isocyanate group / hydroxyl group or an isocyanate group / amino group. Further, it can also be synthesized by a method in which ethylene oxide is ring-opened and added to an alkoxysilyl compound having an active hydrogen group such as a primary or secondary amino group.

When the copolymerization is carried out using a radical polymerization initiator, at least one or more of the polyalkylene oxide chain-containing compounds having a polymerizable double bond and at least one or more of the coupling agents may be used in a non-reactive, appropriate manner. In a suitable solvent. At this time, as a radical polymerization initiator to be used, for example, benzoyl peroxide, dichlorobenzoyl peroxide, 2,5-di (peroxybenzoate) hexyne-3,1,3-bis (t-butylperoxy) Isopropyl) benzene, t
Perester compounds such as -butyl perbenzoate,
Examples include azo compounds such as azobisisobutyronitrile and dimethylazobutyrate, and organic peroxides.

As the polyalkylene oxide chain-containing compound having a polymerizable double bond, for example, polyethylene glycol vinyl ether can be used, and γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyl Methyldiethoxysilane and γ-methacryloxypropyltriethoxysilane can be used alone or in combination of two or more.

When the compound is synthesized by an isocyanate / polyol addition reaction, for example, a compound having a hydroxyl group at a terminal such as polyethylene glycol is used as a compound containing a polyalkylene oxide chain, and an isocyanate such as an isocyanate-containing coupling agent is used as a coupling agent. Compounds having a group are mixed and synthesized. In this synthesis method, it is also possible to use a reaction catalyst such as dibutyltin dilaurate, dibutyltin dimaleate or dioctyltin dimaleate.

As the component (C) synthesized by the above reaction, a compound obtained by adding a coupling agent to both ends of a polyalkylene oxide chain-containing compound can be obtained, and these may be used alone. , Or as a mixture.

Of these components (C), those having an alkylene oxide chain of an ethylene oxide chain are most preferred because of their high non-staining effect of the present invention, that is, high stain resistance and resistance to stain penetration.

The compounding ratio of the component (C) is 0.1 to 20 parts by weight, preferably 0.2 to 10 parts by weight, based on 100 parts by weight of the resin solids of the component (A). If the amount is less than 0.1 part by weight, the resulting cured product is unfavorably deteriorated in initial stain resistance and resistance to penetration of contaminants. Conversely, if the amount exceeds 20 parts by weight, the compatibility with the resin and the water resistance of the cured product will be poor.

In the composition of the present invention, in addition to the transparent (clear) coating film comprising the components (A), (B) and (C),
Colored pigments may be blended to form a colored (enamel) coating film. Examples of such colored pigments include titanium oxide, zinc oxide, carbon black, ferric oxide (bengala), and lead chromate (molybdenum orange). Inorganic pigments such as graphite, yellow iron oxide, ocher, ultramarine, cobalt green, etc., azo, naphthol, pyrazolone, anthraquinone,
Perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine,
Organic pigments such as quinophthalones can be used.

It is also possible to use a body pigment such as heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, white carbon, and diatomaceous earth. In particular, when a matte coating film is formed, it is optimal to use white carbon or diatomaceous earth which least impairs the non-staining effect on the coating film surface.
When these inorganic substances are added to the paint, it is preferable to treat the powder surface with a coupling agent or to add the coupling agent to the paint.

In the composition of the present invention, it is possible to add various additives which can be usually added to the coating material to such an extent that the effects of the present invention are not affected. Examples of such additives include plasticizers, preservatives, fungicides, anti-algal agents, defoamers, leveling agents, pigment dispersants, anti-settling agents, anti-sag agents, matting agents, ultraviolet absorbers and the like. can give.

In the case where the interlayer adhesion is poor when the coating composition of the present invention is applied again, improvement can be made by adding an amine compound.

[0033]

EXAMPLES Examples and comparative examples are shown below to further clarify the features of the present invention.

(Silicate) First, silicates shown in Table 1 were used. The ratio of the remaining amount of silica obtained by firing at 900 ° C. was shown as the amount of SiO ₂ .

[0035]

[Table 1] Next, a polyalkylene oxide chain-containing alkoxysilane compound was synthesized. The synthesis method is as follows.

(Synthesis Example 1) Synthesis Example of Polyalkylene Oxide Chain-Containing Alkoxysilane Compound 1 A polyethylene glycol 200 (average molecular weight: 200; sum) was placed in a reaction vessel equipped with a heating device, a stirrer, a reflux device, a dehydration device, and a thermometer. 20 parts by weight of Kojunyaku Co., Ltd., 54.3 parts by weight of Y-9030 (manufactured by Nippon Unicar Co., Ltd.), which is an isocyanate-containing silane, and 0.05 part by weight of dibutyltin dilaurate were charged and reacted at 50 ° C. for 8 hours. This gave a pale yellow polyethylene oxide chain-containing alkoxysilane compound. The weight average molecular weight of this alkoxysilane compound having a polyethylene oxide chain was 800 as measured by gel permeation chromatography (hereinafter referred to as GPC) in terms of polystyrene.

(Synthesis Example 2) Synthesis Example of Alkoxysilane Compound 2 Containing Polyalkylene Oxide Chain Epolite 40E (polyethylene glycol glycidyl ether) was placed in a reaction vessel equipped with a heating device, a stirrer, a reflux device, a dehydration device, and a thermometer. Average molecular weight 170; Kyoeisha Chemical Co., Ltd.), 100 parts by weight, amino-containing silane A-1100 (manufactured by Nippon Unicar Co., Ltd.), 63.0 parts by weight, and dibutyltin dilaurate, 0.05 part by weight, were charged. For 8 hours to obtain a pale yellow polyethylene oxide chain-containing alkoxysilane compound.
The weight average molecular weight of this polyethylene oxide chain-containing alkoxysilane compound was 980 as measured by GPC in terms of polystyrene.

Next, using the raw materials shown in Table 2, Table 3
The enamel paints 1 to 6 were prepared with the following composition. The fabrication method is as follows.

<Method of preparing paint> 80 parts by weight of a pigment was added to 100 parts by weight of the solid content of various acrylic resins, kneaded uniformly, and various silicates were added thereto in the ratio shown in Table 3; White enamel paint 1 containing an oxide chain-containing alkoxysilane compound or polyethylene glycol (no blend for paint 3 and paint 4)
No. 6 was produced.

[0040]

[Table 2]

[Table 3] The enamel paints thus prepared were evaluated for coating film physical properties, rain streak stain resistance and stain penetration resistance by the following test methods.

<Test Method> Evaluation of appearance after curing of coating film 150 mm x 75 mm x 0.8 mm aluminum plate 7
SK # 1000 primer (epoxy resin primer; manufactured by SK Chemical Co., Ltd.) was applied to
It was spray-coated to a thickness of 0 μm and dried at a temperature of 20 ° C. and a humidity of 65% for 8 hours. Next, the prepared enamel paint was spray-coated on the surface of the SK # 1000 primer of the aluminum plate so as to have a dry film thickness of 25 μm to obtain a test body. Specimens were tested at 20 ° C and 65% humidity for 7 days.
After curing for one day, the appearance of the coating film was evaluated according to the appearance test of JIS K5400 7.1 coating film. In the evaluation, those having no abnormality were marked with ○, and those having abnormality were specifically described.

2. Contact angle measurement after water immersion SK # 1000 primer was dried on an aluminum plate of 150 mm x 75 mm x 0.8 mm with a dry film thickness of about 30 m
After drying for 8 hours in a standard state, the produced enamel paint was spray-coated so as to have a dry film thickness of 40 μm to prepare a test body. After the prepared test body was dried and cured in a standard state for 7 days, it was immersed in deionized water for 3 hours, dried for 18 hours, and measured for a contact angle (measured with a CA-A type contact angle measuring device manufactured by Kyowa Interface Science Co., Ltd.). ,
The same applies hereinafter). This operation (immersion in deionized water for 3 hours → drying for 18 hours → contact angle measurement) was repeated twice more as one set, and the contact angle was measured three times in total. This test artificially creates conditions during actual rainfall, and assumes that rain is at normal pH, not acid rain.

3. Rain streak contamination evaluation A 300 mm × 150 mm × 3.0 mm aluminum plate rolled up so that the angle α becomes 135 ° at a third of the length from above as shown in FIG.
SK # 1000 primer was spray-coated on the “exposure plate” to a dry film thickness of about 30 μm, and dried for 8 hours in a standard state (the exposure plate has a convex surface). Next, the produced enamel paint was spray-coated on an exposure plate so that a dry film thickness was about 40 μm, and dried for 7 days in a standard state to obtain a test body. The prepared specimen faces the south side in Ibaraki City, Osaka Prefecture, and has a large area (a side).
Is set vertically, and the surface is set so that the narrow surface (surface b) is on the upper side. Outdoor exposure is performed, and after one month, three months, and six months, the presence or absence of rain streak stains is visually observed. evaluated. The evaluation is as follows.

◎: No rain streak stain on the vertical surface. ：: Slight rain streak is observed on the vertical surface. Δ: Rain streak is observed on the vertical surface. X: Remarkable rain streak stains are observed on the vertical surface.

4. Stain resistance to dirt SK on aluminum plate of 150mm x 75mm x 0.8mm
The # 1000 primer was spray-coated so as to have a dry film thickness of 30 μm, and dried under standard conditions for 8 hours. Next, the produced enamel paint was spray-coated so as to have a dry film thickness of 40 μm to prepare a test body. After the prepared test specimens were dried and cured for 7 days under standard conditions, JIS K5400 8.
10 According to the stain resistance test, a 15% by weight aqueous dispersion liquid of carbon black was applied to the coating film surface by a diameter of 20 mm and a height of 5 mm.
And left in a constant temperature room at 50 ° C. for 2 hours. Thereafter, the film was washed in running water, and the degree of contamination of the coating film surface was visually evaluated. The evaluation is as follows.

A: No trace. ：: There is a slight trace. Δ: There is a trace. X: There is a remarkable trace.

<Evaluation Results> The evaluation results are shown in Table 4. Paints 1 and 2 are examples of the present invention, and paints 3 to 6 are comparative examples. The paint 3 has the same composition as a general acrylic resin-based paint. However, no decrease in the contact angle is observed, and the result is that the rain streak stain resistance and the permeation resistance are poor.
In addition, Paint 4, which does not contain the polyalkylene oxide chain-containing alkoxysilane compound, which is one of the essential constituent elements of the present invention, exhibited an effect, but was particularly poor in initial contamination. In addition, paints 5 and 6, to which polyethylene glycol was added instead of the polyalkylene oxide chain-containing alkoxysilane compound, had a glossy coating film, and tackiness occurred on the coating film surface. As a result, it was found that there was a problem in the physical properties of the coating film and it was not practical.

[0048]

[Table 4]

According to the non-staining paint composition of the present invention, the coating film is not made hydrophilic for the first time due to the action that occurs after the coating film formation such as rainfall, but the surface becomes hydrophilic immediately after the coating film formation. It is also excellent in dirt penetration resistance,
The soil release effect of washing out contaminants can be exerted from the very beginning after coating film formation. Further, a non-staining acrylic resin-based coating composition having good coating film properties can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an exposure plate.

[Explanation of symbols]

 a: surface that becomes vertical when exposed b: surface that becomes the upper surface when exposed α: bending angle (135 °)

Continued on the front page (72) Inventor Shigeto Uemura 1-25-10 Shimizu, Ibaraki-shi, Osaka Eske Kaken Co., Ltd. (72) Inventor Hisashi Suzuki 1-25-10 Shimizu, Ibaraki-shi, Osaka Eskeー In Kaken Corporation

Claims (3)

[Claims] 1. An acrylic copolymer resin containing (A) an acrylate and / or methacrylate monomer and having a glass transition temperature of 0 to 100 ° C., based on 100 parts by weight of a resin solid content of (B). General formula: (R ₁ to R ₄ is an alkyl group having 1 to 3 carbon atoms, may be different it may be the same) at least one of SiO ₂ in terms of the alkyl silicate or condensates thereof represented by 1 0.1 to 20 parts by weight of a solid content of an alkoxysilane compound having a weight average molecular weight of 150 to 3500, containing 30 to 30 parts by weight and (C) an alkylene oxide chain having 2 to 40 repeating units. A non-staining paint composition characterized by the following: 2. The method according to claim 1, wherein at least one selected from tetramethyl silicate and tetraethyl silicate is used as the alkyl silicate.
A non-staining paint composition according to claim 1. 3. The non-staining coating composition according to claim 1, wherein the alkylene oxide chain of the alkoxysilane compound (C) is an ethylene oxide chain.