JP2000309728A - Resin composition for matte coating and coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for a matte coating excellent in matte effect and in weather resistance of a coated film and to provide a coating using the same. SOLUTION: The title resin composition for a matte coating comprises (C) a non-water-dispersible resin comprising an organic solvent-soluble copolymer (A), obtained by polymerizing (a) 40-100 wt.% of an alkyl (meth)acrylate monomer having at least 8 carbon atoms in the alkyl group of its alkyl ester, (b) 0-45 wt.% of an alkyl (meth)acrylate monomer having 4-7 carbon atoms in the alkyl group of its alkyl ester and (c) 0-25 wt.% of other ethylenically unsaturated monomers, having incorporated therein an organic solvent-insoluble copolymer particle (B) obtained by copolymerizing ethylenically unsaturated monomers comprising an alkyl (meth)acrylate monomer having not more than 2 carbon atoms in the alkyl group of its alkyl ester so that the weight ratio of the copolymer (A) to the copolymer particle (B) is 10/90-40/60. The title coating comprises this resin composition having incorporated therein a curing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a resin composition for a matte paint and a paint.

[0002]

2. Description of the Related Art Many methods have been proposed for matting a coating film. For example, by adding an inorganic powder such as silica powder or an organic powder such as polyethylene powder, which is generally called a matting agent, to generate unevenness on the coating film surface and scatter light reflection to obtain a matting effect. It is.

[0003] However, these methods using a matting agent are inferior in the stability of the coating due to the sedimentation of the matting agent, fail to obtain a uniform matte coating film, and are inferior in coating durability such as weather resistance. There's a problem. In order to solve this problem, a resin composition or the like manufactured by using a special polymerization method without adding a matting agent (see, for example, JP-A-3-81371 and JP-A-6-287235) has been proposed. Proposed. However, there is a problem that the matte property of the coating film is not satisfactory, and the durability of the coating film such as weather resistance and water resistance is poor.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin composition which is excellent in matting properties and is suitable for a paint.

[0005] Another object of the present invention is to provide, in addition to the above effects,
An object of the present invention is to provide a resin composition having excellent water resistance of a coating film and suitable for a coating material.

Another object of the present invention is to provide a matting paint having excellent chemical resistance, moisture resistance and water resistance of a coating film.

[0007]

According to the present invention, there is provided (a) an alkyl acrylate monomer having an alkyl group of at least 8 carbon atoms and / or an alkyl ester of an alkyl ester having at least 8 carbon atoms. 40 to 100% by weight of an alkyl methacrylate monomer, (b) an alkyl acrylate monomer having an alkyl group of 4 to 7 carbon atoms and / or an alkyl group of an alkyl ester having 4 to 4 carbon atoms. And a copolymer (A) soluble in an organic solvent obtained by polymerizing 0 to 45% by weight of an alkyl methacrylate monomer of No. 7 and (c) 0 to 25% by weight of another ethylenically unsaturated monomer. ), An alkyl acrylate monomer having an alkyl group of 2 or less carbon atoms and / or an alkyl group of an alkyl ester having 2 or less carbon atoms. Copolymer particles (B) insoluble in an organic solvent obtained by copolymerizing an ethylenically unsaturated monomer containing an alkyl acrylate monomer are converted into copolymer (A) and copolymer particles ( B) ratio of 10/90 to 40
/ 60 (weight ratio) The present invention relates to a matte coating resin composition containing a non-aqueous dispersion type resin (C).

[0008] The present invention relates to a paint obtained by blending a curing agent with the above-mentioned resin composition for a matte paint.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The copolymer (A) soluble in an organic solvent according to the present invention is an alkyl acrylate and / or alkyl ester in which the alkyl group of the alkyl ester of (a) has 8 or more carbon atoms. Wherein the alkyl group of the methacrylic acid alkyl ester has 8 or more carbon atoms, (b) the alkyl group of the alkyl ester has 4 to 7 carbon atoms and / or the alkyl group of the alkyl ester has 4 carbon atoms. To (7) and (c) other ethylenically unsaturated monomers.

(A) Examples of the alkyl acrylate in which the alkyl group of the alkyl ester has 8 or more carbon atoms include 2-ethylhexyl acrylate, octyl acrylate, nonyl acrylate, lauryl acrylate, cetyl acrylate, and acrylic acid. Isobornyl, eicosyl acrylate, decyl acrylate, undecyl acrylate, dodecyl acrylate, and the like. Examples of the alkyl methacrylate having an alkyl group having 8 or more carbon atoms include 2-ethylhexyl methacrylate and methacrylic acid. Octyl, nonyl methacrylate, lauryl methacrylate, cetyl methacrylate, isobornyl methacrylate, eicosyl methacrylate, decyl methacrylate, undecyl methacrylate, dodecyl methacrylate and the like. These alkyl acrylates and alkyl methacrylates having 8 or more carbon atoms are used alone or in combination of two or more.

(B) Alkyl acrylates having 4 to 7 carbon atoms in the alkyl group of the alkyl ester include:
Butyl acrylate, iso-butyl acrylate, t-butyl acrylate, pentyl acrylate, hexyl acrylate, cyclohexyl acrylate, isohexyl acrylate, heptyl acrylate, and the like. The alkyl group of the alkyl ester has 4 carbon atoms. Examples of the alkyl methacrylates of Nos. To 7 include butyl methacrylate, iso-butyl methacrylate, t-butyl methacrylate, pentyl methacrylate, hexyl methacrylate, cyclohexyl methacrylate, isohexyl methacrylate, and heptyl methacrylate. These have 4 to 7 carbon atoms
Of the acrylic acid alkyl ester and the methacrylic acid alkyl ester are used alone or in combination of two or more.

The other ethylenically unsaturated monomers (c) include hydroxyalkyl acrylates, hydroxyalkyl methacrylates, alkyl acrylates having 1 to 3 carbon atoms in the alkyl group of the alkyl ester or methacrylic acid. Acid alkyl ester, monohydric acrylate or methacrylic acid ester of polyhydric alcohol, acrylamide and its derivative, acrylic acid derivative or methacrylic acid derivative having an oxirane group, acrylic acid ester or methacrylic acid ester having a hindered amino group, Examples include acrylate or methacrylate having a benzotriazole group, unsaturated carboxylic acid, acrylonitrile, methacrylonitrile, and the like.

Examples of the hydroxyalkyl acrylate include 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 2-hydroxy-iso-propyl acrylate, 4-hydroxybutyl acrylate and 2-hydroxy-acrylate. iso-butyl,
5-hydroxypentyl acrylate, 2-hydroxy-iso-pentyl acrylate, 6-hydroxyhexyl acrylate, and the like. These hydroxy compounds of acrylic acid and adducts of ε-caprolactone, γ-valalolactone, and the like are also (c). Used as a component ethylenically unsaturated monomer.

Examples of the hydroxyalkyl methacrylate include 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxy-iso-propyl methacrylate, and methacrylic acid 4
-Hydroxybutyl, 2-hydroxy-i-methacrylate
so-butyl, 5-hydroxypentyl methacrylate,
2-hydroxy-iso-pentyl methacrylate, 6-hydroxyhexyl methacrylate, and the like. Addition compounds such as these methacrylic acid hydroxyesters and ε-caprolactone and γ-balalolactone may also be used as the ethylenically unsaturated monomer (c). Used as a monomer.

Examples of the alkyl acrylate or alkyl methacrylate having 1 to 3 carbon atoms in the alkyl group of the alkyl ester include methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, methyl methacrylate, and the like. Examples include ethyl methacrylate, propyl methacrylate, and isopropyl methacrylate.

Examples of the monoacrylate of a polyhydric alcohol include a monoacrylate or a monomethacrylate such as glycerin and trimethylolpropane, and a derivative of an acrylamide or a methacrylamide includes, for example, N-methylol acrylamide, N-methylol methacrylamide, and alkyl ether compounds thereof, and the like. Examples of the acrylic acid derivative or methacrylic acid derivative having an oxirane group include glycidyl acrylate,
Glycidyl methacrylate and the like can be mentioned.

Examples of the unsaturated acid include acrylic acid,
Examples include methacrylic acid, maleic acid, and fumaric acid.

Examples of the vinyl compound include vinyl acetate and vinyl chloride. These monomers are
Used alone or in combination of two or more.

The mixing ratio of the component (a) is based on the copolymer (A)
It is preferably from 40 to 100% by weight, and more preferably from 50 to 80% by weight, based on the total amount of the monomers used for the polymerization.
If the component (a) is less than 40% by weight, the matting effect can hardly be expected. The compounding ratio of the component (b) is preferably from 0 to 45% by weight based on the total amount of the monomers used for the polymerization of the copolymer (A), and more preferably from 15 to 40% by weight.
If the component (b) exceeds 45% by weight, the matting effect cannot be expected. The compounding ratio of the component (c) is as follows, based on the total amount of the components used in the polymerization of the copolymer (A).
It is preferably 0 to 25% by weight, and more preferably 3 to 10% by weight. If the amount of the component (c) exceeds 25% by weight, the matting effect cannot be expected, and the copolymer particles (B) may coagulate and precipitate during the synthesis of the non-aqueous dispersion resin (C).

In the polymerization of the copolymer (A), even if the compounding amount of the component (b) or the component (c) is 0, each of the components (a), (b), and (c) is within the above-mentioned mixing ratio. If the components are blended, the resin composition for a paint which exhibits the matting property of the present invention can be obtained. However, from the viewpoint of improving the performance of the paint and the coating film, the components (b) and (c) are used. Is preferably blended in the above range. When the component (b) is blended, the hardness and stain resistance of the coating film tend to be improved. Also,
It is preferable to use a hydroxyalkyl acrylate monomer and / or a hydroxyalkyl methacrylate monomer as the component (c) because the coating properties such as water resistance and weather resistance are improved. At this time, the compounding ratio of the hydroxyalkyl acrylate monomer and / or the hydroxyalkyl methacrylate monomer may be such that the hydroxyl value of the copolymer (A) is 5 to 70 mgKOH / g. preferable. Hydroxyl value is 5mgKOH /
If it is less than g, the weather resistance tends to be poor, and the hydroxyl value is 70 m.
If it exceeds gKOH / g, the water resistance of the coating film tends to be poor. Further, when an unsaturated acid monomer is used in the component (c), the pot life and curability of the obtained composition can be controlled. The acid value of the copolymer (A) is 0.01 to
It is preferably 20 mgKOH / g, and 0.1 to 1 mgKOH / g.
0 mgKOH / g is more preferable, and 0.5 to
More preferably, it is 7 mgKOH / g. If the acid value is less than 0.01 mgKOH / g, the curability tends to be poor, and if the acid value exceeds 20 mgKOH / g, the pot life tends to be short.

As a method for polymerizing the copolymer (A), for example, a usual radical polymerization method can be used, and the method is not particularly limited. As a method of performing polymerization using a radical polymerization method, for example, the components (a), (b) and (c), and a polymerization initiator are mixed in an organic solvent, and the mixture is mixed at 50 to 200 ° C and 1 to 10 ° C.
A time heating method can be used. As the organic solvent used in the radical polymerization method, for example, aromatic hydrocarbons such as toluene, xylene, Solvesso 100, Solvesso 150, pentane, hexane,
Aliphatic hydrocarbons such as heptane, octane and decane, cycloaliphatic hydrocarbons such as cyclohexane, methylcyclohexane and ethylcyclohexane, esters such as ethyl acetate, butyl acetate and cellosolve acetate, methyl ethyl ketone and methyl isobutyl ketone And alcohols such as 1-butanol, 2-butanol, 1-propanol, 2-propanol and butyl cellosolve. In addition, a mixed solvent of aliphatic hydrocarbons such as mineral spirit, mineral thinner, petroleum spirit, white spirit, and mineral terpene can also be used.

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

Examples of the polymerization initiator used for the polymerization of the copolymer (A) include organic peroxides and azo compounds. Examples of the organic peroxide include isobutyl peroxide, lauroyl peroxide, 3,5,5-
Trimethylhexanoyl peroxide, octanoyl peroxide, t-butylcumyl peroxide, benzoyl peroxide, dichlorobenzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, 1,1-bis (t-butyl Peroxy)-
3,3,5-trimethylcyclohexane, 3,3,5-
Trimethylcyclohexanone peroxide, methylcyclohexanone peroxide, diisobutylperoxydicarbonate, 2-diethylhexylperoxydicarbonate, 2,5-dimethyl-2,5-bis (2-
Ethylhexanoylperoxy) hexane, 1,1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-hexylperoxy) cyclohexane, 1,1-bis ( t-butylperoxy) cyclohexane, 2,2-bis (t-butylperoxy) butane, t-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, t-
Butyl peroxy-2-ethylhexanoate, 1,
Examples thereof include 1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, t-hexylperoxy-2-ethylhexanoate, t-butylperoxyisobutyrate, and the like. As the azo compound, 2,
2'-azobis-isobutyronitrile, dimethylazodiisobutyrate, 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2-methylbutyronitrile), 2,2 '-Azobis (4-methoxy 2,4-dimethylvaleronitrile), (1-phenylethyl) azodiphenylmethane, dimethyl-2,2'-azobisisobutyrate, 1,1'-azobis (1-cyclohexanecarbonitrile ), 2,2'-azobis (2,2,4-trimethylpentane), 2-phenylazo-2,4-dimethyl-4-methoxyvaleronitrile,
2,2 'azobis (2-methylpropane) and the like.

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

The amount of the polymerization initiator to be used is determined according to the desired molecular weight of the copolymer (A). Usually, the amount of the polymerizable unsaturated monomer used for the polymerization of the component (A) is usually one. It is preferable to set the amount to 0.1 to 10.0% by weight based on the total amount.

If necessary, the molecular weight may be adjusted using a chain transfer agent. Examples of the chain transfer agent include n-dodecyl mercaptan, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropyltriethoxysilane, and the like.

The weight average molecular weight of the copolymer (A) in the present invention (value measured by GPC and converted to standard polystyrene,
The same applies hereinafter), preferably from 10,000 to 400,000, more preferably from 20,000 to 200,000. When the weight average molecular weight is less than 10,000, weather resistance and chemical resistance tend to decrease, and
If it exceeds 000, the viscosity of the resin becomes high, and it tends to be practically difficult to prepare a paint.

The non-aqueous dispersion type resin (C) in the present invention comprises:
In the presence of the copolymer (A) solution, an alkyl acrylate monomer having an alkyl group of 2 or less carbon atoms and / or an alkyl methacrylate ester having an alkyl group of 2 or less carbon atoms in an alkyl ester The monomer is polymerized, and the copolymer (A) solution contains copolymer particles (B) insoluble in an organic solvent.

The copolymer particles (B) which are insoluble in the organic solvent of the present invention can be obtained in the presence of the copolymer (A) and the organic solvent in the presence of the alkyl acrylate monoester having 2 or less carbon atoms in the alkyl group of the alkyl ester. Can be obtained by polymerizing an ethylenically unsaturated monomer containing an alkyl methacrylate monomer having 2 or less carbon atoms in the alkyl group of the acrylate and / or the alkyl acrylate. The mixing ratio of the monomer and / or the alkyl methacrylate monomer is preferably 70% by weight or more based on the total amount of the ethylenically unsaturated monomers used for the polymerization of the copolymer particles (B). If it is less than 70% by weight, the copolymer particles are easily dissolved in a solvent, and the storage stability of the resin tends to be poor. Examples of the alkyl acrylate monomer and the alkyl methacrylate monomer having 2 or less carbon atoms include methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate.

When the hydroxyalkyl acrylate monomer and / or the hydroxyalkyl methacrylate monomer are used among the ethylenically unsaturated monomers used in the polymerization of the copolymer particles (B), It is preferable because the coating properties such as weather resistance are improved. At this time, the blending ratio of the hydroxyalkyl acrylate monomer and / or the hydroxyalkyl methacrylate monomer is such that the hydroxyl value of the copolymer particles (B) is 5 to 150 mgKOH /
g, preferably from 10 to 100 g.
mgKOH / g, more preferably 20 to 70 mgKOH / g.
More preferably, it is mgKOH / g. If the hydroxyl value is less than 5 mgKOH / g, the weather resistance tends to be poor,
If the hydroxyl value exceeds 150 mgKOH / g, the coating tends to have poor water resistance. When an unsaturated acid monomer is used among the ethylenically unsaturated monomers used for the polymerization of the copolymer particles (B), the copolymer may be used to control the pot life and curability of the obtained composition. The acid value of the polymer (C) is from 0.01 to
It is preferably 20 mgKOH / g, and 0.1 to 1 mgKOH / g.
0 mgKOH / g is more preferable, and 0.5 to
More preferably, it is 7 mgKOH. Acid value is 0.
If it is less than 01 mgKOH / g, the curability tends to be poor,
When the acid value exceeds 20 mgKOH / g, the pot life tends to be shortened.

In the present invention, the mixing ratio of the copolymer (A) and the copolymer particles (B) is based on the total amount of the copolymer (A) and the copolymer particles (B) being 100 parts by weight. (A)
Is preferably 10 to 40 parts by weight, and the compounding amount of the copolymer particles (B) is preferably 60 to 90 parts by weight, and the compounding amount of the copolymer (A) is preferably 20 to 35 parts by weight. More preferably, the blending ratio of the united particles (B) is 65 to 80 parts by weight. If the blending amount of the copolymer particles (B) is less than 60 parts by weight, the matting property tends to be inferior. If the blending amount is 90 parts by weight or more, the dispersion stability of the copolymer particles (B) is inferior and during synthesis or storage. Particles tend to agglomerate and settle. Also,
For the purpose of improving dispersion stability, it is also possible to graft the copolymer (A) and the copolymer particles (B).

The average particle size of the copolymer particles (B) (for example, a value obtained by measuring with an N4 type submicron particle analyzer manufactured by Coulter Co., Ltd. in an INTENSITY mode at a temperature of 20 ° C., the same applies hereinafter) is about 100. ~ 2000nm
And more preferably about 300 to 1000 nm. If it is too small, the viscosity of the resin solution tends to be high, and if it is too large, the particles tend to swell or aggregate during storage, resulting in poor stability. This average particle diameter is adjusted by selecting the organic solvent, the molecular weight of the copolymer (A), the blending ratio of the copolymer (A) and the copolymer particles (B), and the solubility parameter (SP value). You.

The weight average molecular weight of the whole resin in the non-aqueous dispersion type resin composition thus obtained is 10,000.
~ 400,000, preferably 20,000 ~
More preferably, it is 200,000. If the weight average molecular weight is less than 10,000, the weather resistance tends to be inferior, and if it exceeds 400,000, the viscosity of the resin becomes high, and it becomes difficult to make a coating material practically.

It is preferable that the compounding ratio of the organic solvent in the resin composition for a matte paint of the present invention is 10 to 65% by weight.

The above-obtained resin composition for matte coating is preferable because a polyisocyanate is blended as a curing agent to obtain a coating having improved weather resistance, water resistance and chemical resistance.

The polyisocyanate compound is a compound containing two or more isocyanate groups in the molecule, for example, hexamethylene diisocyanate, isophorone diisocyanate, lysine diisocyanate,
2,4-trimethylhexamethylene diisocyanate,
Examples thereof include aliphatic or alicyclic isocyanates such as methylcyclohexane diisocyanate and isopropylidenebis (4-cyclohexyl isocyanate), and trimers thereof. Further, these isocyanates and polyhydric alcohol compounds such as propanediol, butanediol, hexanediol, decanediol, dodecanediol, 12-hydroxystearyl alcohol, polyethylene glycol, trimethylolpropane, pentaerythryl, and dimer diol, and water and Can be used as the polyisocyanate compound.

The blending amount of the polyisocyanate compound is preferably such that the equivalent ratio of hydroxyl group / isocyanate group of the non-aqueous dispersion type resin (C) is 0.5 to 2.0, and 0.8 to 2.0.
It is more preferable to set it to 1.2. If it is less than 0.5, the unreacted polyisocyanate compound remains in the coating film, so that the properties of the coating film tend to decrease. If it exceeds 2.0, the water resistance and weather resistance of the coating film tend to decrease. It is preferable that the matting resin composition of the present invention and the polyisocyanate compound are mixed and stirred and mixed immediately before coating.

The resin composition for a matte paint according to the present invention can be mixed with an inorganic pigment and an organic pigment to form an enamel paint. As the inorganic pigment, for example, titanium white,
Examples of the organic pigment include phthalocyanine blue and azo-based organic pigments.
In addition, extenders such as calcium carbonate and barium sulfate can be added. These are usually added to the base. It is also possible to make a clear paint without adding the pigment. As a method of making an enamel paint, for example,
A known method such as a roll, a sand mill, and a disperser can be used. In addition, when enamel coating with a non-aqueous dispersion resin, high shear force is applied, the resin may cause agglomeration, so a seed pen having good compatibility with the curable composition obtained by the present invention. It can also be used to make an enamel paint. Further, in order to improve the performance as a paint, a pigment dispersant, a leveling agent, an antifoaming agent, an ultraviolet absorber, a light stabilizer and the like can be added at the time of forming the paint or after the paint is formed.

The paint of the present invention is prepared according to a usual coating method.
It can be used for coating various substrates and surfaces of articles.
For coating, for example, an air spray machine, an airless spray machine, an electrostatic coater, a dipping, a roll coater, a brush or the like can be used. Examples of the substrate include wood, metal, slate, roof tile, and the like.

When the paint of the present invention is used as a curable paint, it is necessary to cure the coating film.
After the application, it is preferable to leave at room temperature to 300 ° C. for about 1 minute to 10 days.

[0041]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. In addition,
“Parts” indicates “parts by weight”.

Production Examples 1-5 Production of Copolymer (A) Solution Soluble in Organic Solvent A flask equipped with a thermometer, a stirrer, a nitrogen gas blowing tube and a reflux condenser was charged with 20 parts of xylene and 25 parts of butyl acetate. The mixture was heated to 110 ° C. under a nitrogen stream, and the mixture shown in Table 1 was added dropwise over 2 hours. Subsequently, a mixed solution of 5 parts of xylene and 0.2 parts of t-butylperoxy-2-ethylhexanoate was added dropwise over 5 minutes, and the mixture was further kept warm for 3 hours. Thereafter, the mixture was cooled, and xylene was added so that the heating residue was about 35% by weight to obtain a copolymer (A-1 to A-5) solution. Table 1 shows the heating residue, acid value, hydroxyl value, and weight average molecular weight of the obtained copolymer solution.

[0043]

[Table 1] Production Examples 6 to 8 Production of Non-Aqueous Dispersion Type Resin (C) Solution and Comparative Examples 1 and 2 Charge the copolymer (A) solution,
The temperature was raised to 110 ° C. under a nitrogen stream, and the mixture shown in Table 2 was mixed with 1
It was dropped over time. Subsequently, a mixture of 25 parts of xylene and 0.4 part of t-butylperoxy-2-ethylhexanoate was added dropwise over 1 hour, and the mixture was further kept warm for 3 hours. After cooling, xylene was added so that the heating residue was about 50% by weight. Among them, Production Example 9 (Comparative Example 1)
In Production Example 10 (Comparative Example 2), the particles aggregated when the resin was cooled, and a non-aqueous dispersion type resin (C) solution could not be obtained. Table 2 shows the heating residue, acid value, hydroxyl value, and weight average molecular weight of the obtained non-aqueous dispersion type resin (C) solution.

[0044]

[Table 2] Examples 1-3 and Comparative Examples 3-4 The hydroxyl values of the non-aqueous dispersion type resin solutions C-1 to C-3 and C-6 to C-7 obtained in Production Examples 6 to 8 and Production Examples 11 to 12. A polyisocyanate (trade name: Duranate TSA-100, Asahi Kasei Corporation)
Was prepared to prepare a paint. The prepared paint was applied to a Ponderite # 144-treated steel plate (manufactured by Nippon Test Panel Co., Ltd.) using a bar coater # 60 so that the dry film thickness became 30 μm, and cured at room temperature for 1 week to prepare a test plate. . (Evaluation) For the prepared test plate, according to the following method,
The matting properties, water resistance and chemical resistance were evaluated, and the evaluation results are shown in Table 3. (1) Matting property The 60-degree specular reflectance (%) of the prepared test plate was measured with a gloss meter (manufactured by Nippon Denshoku Co., Ltd.). (2) Water resistance The prepared test plate was immersed in tap water and allowed to stand for 240 hours, and the appearance of the coating film (bulging, cracking, luster, whitening) was visually observed and evaluated according to the following criteria. ○: No abnormality in the coating film △: An abnormality occurred in part of the coating film ×: An abnormality occurred in the entire coating film (3) Chemical resistance (alkali resistance) The prepared test plate was immersed in a saturated calcium hydroxide aqueous solution. After standing for 240 hours, the appearance of the coating film (bulging, cracking, luster, whitening) was visually observed and evaluated according to the following criteria. ○: No abnormality in the coating film △: An abnormality occurred in a part of the coating film ×: An abnormality occurred in the entire coating film (4) Moisture resistance The prepared test plate was left at a temperature of 49 ° C. and a humidity of 98 RH% for 240 hours. And paint film appearance (swelling, cracking,
(Glossy, whitening) was visually observed and evaluated according to the following criteria. ○: No abnormality in the coating film △: An abnormality occurred in part of the coating film ×: An abnormality occurred in the entire coating film (5) Weather resistance The prepared test plate was measured with a metal weather meter (manufactured by Daipla Wintes Co., Ltd.). 6 hours of light irradiation (irradiation intensity 70 mW / cm ² , irradiation temperature 60 ° C, irradiation humidity 30
RH%), darkness 2 hours (dark temperature 30 ° C., darkness humidity 98% RH (condensation)), water spray 5 seconds / 15 minutes (light irradiation) as one cycle, and the coating film after a 30-cycle test The appearance (swelling, cracking, luster, whitening) was visually observed and evaluated according to the following criteria. ：: No abnormality in the coating film △: An abnormality occurred in a part of the coating film ×: An abnormality occurred in the entire coating film

[0045]

[Table 3] In Comparative Examples 1 and 2, the non-aqueous dispersion type resin (C) itself could not be produced, indicating that the mixing ratio of each component in the present invention is important.

According to Table 3, the coating obtained in Comparative Example 3 had a high gloss value of 66 in the matting property column, indicating that the coating was inferior in matting properties. It is.
Similarly, in the paint obtained in Comparative Example 4, the evaluation result in the matting property column was as high as 56 in the gloss value, and the evaluation result in the water resistance and chemical resistance columns was Δ ( ), And the evaluation result of moisture resistance and weather resistance is x (abnormal occurrence in the entire coating film), indicating that this coating material is inferior in matting property and inferior in coating film performance.

On the other hand, according to Table 3, Examples 1 to 3 are shown.
In the paint obtained in the above, the evaluation result in the matting property column was as low as 10 or less in gloss value, and the evaluation result in the water resistance and chemical resistance columns was ○ (no abnormality in the coating film). Was. Thus, it is shown that the paints obtained in Examples 1 to 3 are excellent in matting properties, water resistance and chemical resistance.

[0048]

The resin composition for a matte coating of the present invention has excellent matting properties and is suitable for coatings.

The resin composition for matte coatings of the present invention has excellent water resistance of the coating film and is suitable for coatings.

The paint of the present invention is excellent in matting properties and excellent in chemical resistance and water resistance of a coating film, and is suitable for a matte paint.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J034 BA03 DA01 DP18 HA01 HA06 HA07 HC03 HC12 HC17 HC22 HC52 HC71 HC73 QB19 RA07 4J038 CG141 CG142 CH031 CH032 CH041 DG262 GA03 KA03 MA02 MA07 MA10 NA01

Claims (4)

[Claims] (A) an alkyl acrylate monomer having an alkyl group of 8 or more carbon atoms and / or an alkyl methacrylate monomer having an alkyl group of 8 or more carbon atoms. ~ 100
% By weight, (b) an alkyl acrylate monomer having 4 to 7 carbon atoms in the alkyl group of the alkyl ester and / or an alkyl methacrylate monomer having 4 to 7 carbon atoms in the alkyl group of the alkyl ester To 45% by weight and (c) a copolymer (A) soluble in an organic solvent obtained by polymerizing 0 to 25% by weight of another ethylenically unsaturated monomer. Number 2
Organic solvent obtained by copolymerizing the following ethylenically unsaturated monomer containing an acrylic acid alkyl ester monomer and / or a methacrylic acid alkyl ester monomer having 2 or less carbon atoms in the alkyl group of the alkyl ester Non-aqueous dispersion containing copolymer particles (B) insoluble in water such that the ratio of copolymer (A) to copolymer particles (B) is 10/90 to 40/60 (weight ratio). A resin composition for a matting paint comprising a mold resin (C). 2. The non-aqueous dispersion type resin (C) has a hydroxyl value of 5 to 5.
The matte coating resin composition according to claim 1, wherein the resin composition is 100 mgKOH / g. 3. A coating composition comprising the resin composition according to claim 1 and a curing agent. 4. The coating according to claim 3, wherein the curing agent is a polyisocyanate.