JP2003342313A - Aqueous resin composition and aqueous coating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aqueous resin composition with an excellent film forming property, whether resistance and flexibility of the film under low temperature conditions, and a coating material prepared by using it. <P>SOLUTION: The aqueous resin composition is prepared by emulsion polymerization of (b) a polymerizable unsaturated monomer having a cycloalkyl group, (c) a polymerizable unsaturated monomer having a silyl group of the formula: -Si(X<SB>n</SB>)-Y<SB>3-n</SB>(1) (wherein X is a 1-10C alkyl group or the like; Y is an alkoxy group or the like; n is a number of 0-3; and X and Y may be the same or different when 2 or more X or Y are present) and (d) a polymerizable unsaturated monomer having neither cycloalkyl nor silyl group in an aqueous (a) urethane dispersed solution. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an aqueous resin composition and an aqueous paint.

[0002]

2. Description of the Related Art Paints used for top coating of buildings are required to have high durability, that is, weather resistance, stain resistance, water resistance, moisture resistance, acid resistance, alkali resistance and the like. In addition, from the viewpoint of improving the working environment of the coating operator or the coating site and its surroundings, and reducing the load on the global environment, there is a demand for a water-based coating that uses as little organic solvent as possible.

Therefore, in order to meet these requirements, paints using an acrylic emulsion having a hydrolyzable silyl group have been proposed. This acrylic emulsion having a hydrolyzable silyl group has higher weather resistance than a non-crosslinked acrylic emulsion because the silyl group causes a crosslinking reaction at room temperature.

[0004]

However, in conventional paints, even when an acrylic emulsion having a hydrolyzable silyl group is used, the film-forming property during low-temperature coating and the low temperature of the resulting coating film are low. It wasn't always enough in terms of flexibility.

The present invention has been made in view of the above problems of the prior art, and is an aqueous resin composition excellent in film-forming property, weather resistance and flexibility of a coating film even under low temperature conditions,
Another object of the present invention is to provide a coating material using the aqueous resin composition.

[0006]

In order to solve the above-mentioned problems, the aqueous resin composition of the present invention comprises a cycloalkyl group-containing polymerizable monomer in an aqueous dispersion in which the urethane dispersion (a) is dispersed. Saturated monomer (b) and the following general formula (1):

[0007]

[Chemical 2]

[In the formula (1), X is an alkyl group having 1 to 10 carbon atoms, an aryl group having 1 to 10 carbon atoms and 1 to 1 carbon atoms.
0 represents a monovalent hydrocarbon group selected from aralkyl groups, Y represents a group selected from an alkoxy group, a hydroxyl group, an acyloxy group, a halogen atom and a phenoxy group, and n represents 0
Represents an integer of 3 to 3 and when X or Y is 2 or more, they may be the same or different.], A polymerizable unsaturated monomer (c) having a silyl group, a cycloalkyl group and It is obtained by emulsion-polymerizing a polymerizable unsaturated monomer (d) having no silyl group.

The aqueous coating composition of the present invention contains the above-mentioned aqueous resin composition of the present invention.

The aqueous resin composition of the present invention, as described above,
It is obtained by emulsion-polymerizing the polymerizable unsaturated monomers (b) to (d) in an aqueous dispersion liquid in which the urethane dispersion (a) is dispersed, and thus (a) to (d) is obtained. By compounding the components, the film formability, weather resistance and flexibility of the coating film are maintained at a high level over a wide temperature range. Therefore, the aqueous coating composition of the present invention containing the aqueous resin composition makes it possible to form a good coating film even during low temperature coating.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the aqueous resin composition of the present invention emulsifies the polymerizable unsaturated monomers (b), (c) and (d) in the presence of the urethane dispersion (a). It is obtained by polymerization.

The urethane dispersion (a) according to the present invention means a polyurethane resin imparted with water dispersibility by the introduction of hydrophilic groups such as carboxyl groups, oxyalkylene chains such as oxyethylene chains and oxypropylene chains, or It means a polyurethane resin forcibly dispersed in water by a surfactant. Here, the ionic property of the urethane dispersion (a) is emulsion polymerization (seed polymerization).
From the viewpoint of polymerization stability at the time, it is preferably anionic or nonionic. An aqueous dispersion containing such a urethane dispersion (a) can be prepared in accordance with a conventional method, but Vividrol PR240, Vividrol PR340 (all manufactured by Sumika Bayer Urethane Industry Co., Ltd.), Superflex 110 and Superflex. Commercially available products such as 150, Superflex 420, and Superflex E-2000 (all manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) may be used.

The polymerizable unsaturated monomer (b) contains a cycloalkyl group, and examples thereof include cyclohexyl (meth) acrylate and methylcyclohexyl (meth).
Acrylate, cyclododecyl (meth) acrylate,
Examples thereof include dicyclopentanyl (meth) acrylate and isobornyl (meth) acrylate. Of these, cyclohexyl methacrylate, dicyclopentanyl (meth) acrylate, and isobornyl (meth) acrylate are preferable from the viewpoint of weather resistance and water resistance of the coating film. These polymerizable unsaturated monomers (b) are used alone or in combination of two or more.

The amount of the polymerizable unsaturated monomer (b) compounded is preferably 10 to 70 parts by weight based on 100 parts by weight of the total amount of the polymerizable unsaturated monomers (b) to (d). . When the content of the polymerizable unsaturated monomer (b) is less than 10 parts by weight, the water resistance and weather resistance of the resulting coating film tend to be insufficient, and when it exceeds 70 parts by weight, it is obtained. The flexibility of the coating film tends to decrease.

The polymerizable unsaturated monomer (c) has the following general formula (1):

[0016]

[Chemical 3]

[In the formula (1), X is an alkyl group having 1 to 10 carbon atoms, an aryl group having 1 to 10 carbon atoms and 1 to 1 carbon atoms.
0 represents a monovalent hydrocarbon group selected from aralkyl groups, Y represents a group selected from an alkoxy group, a hydroxyl group, an acyloxy group, a halogen atom and a phenoxy group, and n represents 0
Represents an integer of 3 or more, and when X or Y is 2 or more, they may be the same or different, and have a silyl group.

In the formula (1), the alkyl group represented by X is a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a tert-butyl group, a linear or branched pentyl group. Group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched nonyl group, linear or branched decyl group, and the like. In addition to the phenyl group and the naphthyl group, the aryl group also includes an alkylaryl group such as a tolyl group, a xylyl group and an ethylphenyl group. Also,
Examples of the aralkyl group (arylalkyl group) represented by X include a benzyl group and a phenylethyl group.

The alkoxy group represented by Y is a methoxy group, an ethoxy group, a propoxy group or the like; the acyloxy group is an acetoxy group (CH ₃ COO-) or a benzoyloxy group (C ₆ H ₅ COO-). Etc .; Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom and the like.

Specific examples of the polymerizable unsaturated monomer (c) include alkoxysilanes, halogenated silanes, acyloxysilanes, silanols and the like.

Specific examples of alkoxysilanes include γ-acryloxypropyltrimethoxysilane and γ.
-Methacryloxypropyltrimethoxysilane, γ-acryloxypropylmethyldimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-acryloxypropyldimethylmethoxysilane, γ-methacryloxypropyldimethylmethoxysilane, γ-acryloxypropyltri Ethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-acryloxypropylmethyldiethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-acryloxypropyldimethylethoxysilane, γ-methacryloxypropyldimethylethoxysilane, Vinyltrimethoxysilane, vinylmethyldimethoxysilane, vinyltriethoxysilane, vinylmethyldiethoxysilane, trimethoxysilylstyrene, dimetho -Thieno silyl styrene,
Examples thereof include triethoxysilylstyrene and diethoxymethylsilylstyrene.

Examples of halogenated silanes include vinylmethyldichlorosilane, γ-methacryloxypropyltrichlorosilane and γ-acryloxypropylmethyldichlorosilane.

Examples of the acyloxysilanes include vinylmethyldiacetoxysilane and γ-methacryloxypropylmethyldiacetoxysilane.

Among the above polymerizable unsaturated monomers (c),
Alkoxysilanes, which have good polymerizability with other vinyl monomers and are easily industrially available, are preferable, and γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, and γ-methacryloxypropyl. Methyldimethoxysilane and γ-methacryloxypropylmethyldiethoxysilane are particularly preferred. These polymerizable unsaturated monomers (c) are used alone or in combination of two or more.

The content of the polymerizable unsaturated monomer (c) is 0.1 to 15 parts by weight based on 100 parts by weight of the total amount of the polymerizable unsaturated monomers (b) to (d). Is preferred,
It is more preferably 10 parts by weight. When the compounding amount of the polymerizable unsaturated monomer (c) is less than 0.1 part by weight, the durability and curability of the resulting composition tend to be insufficient, and when it exceeds 15 parts by weight. The flexibility of the coating film tends to decrease.

The polymerizable unsaturated monomer (d) has neither a cycloalkyl group nor a silyl group, and is, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth). (Meth) acrylic acid alkyl ester such as acrylate, t-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate , A hydroxyl group-containing (meth) acrylic acid ester such as 2-hydroxyethyl (meth) acrylate, a carboxyl group-containing polymerizable monomer such as methacrylic acid and acrylic acid, glycidyl (meth) acrylate,
Epoxy group-containing (meth) acrylic acid ester such as methylglycidyl (meth) acrylate and 3,4-epoxycyclohexyl (meth) acrylate, hindered amino group-containing (meth) acrylic acid ester, benzotriazole group-containing (meth) acrylic acid Examples thereof include esters, styrenes, styrenes such as divinylbenzene, and the like.

The compounding amount of the polymerizable unsaturated monomer (d) is 15 to 89.9 parts by weight based on 100 parts by weight of the total amount of the polymerizable unsaturated monomers (b) to (d). Is preferred. When the amount of the polymerizable unsaturated monomer (d) is less than 15 parts by weight, the flexibility of the coating film tends to decrease, and 89.9.
If it exceeds the parts by weight, the blending amounts of (b) and (c) will be small, and the weather resistance will tend to be reduced.

The ratio of the blending amount of the urethane dispersion (a) to the total amount of the polymerizable unsaturated monomers (b) to (d) is 1:99 to 30:70 by weight. Is preferred, and more preferably 5:95 to 20:80. When the amount of the component (a) is less than 1 part by weight based on 100 parts by weight of the total amount of the components (a) to (d), the flexibility and film-forming property of the coating film tend to be insufficient. , Again, 30
If the amount is more than parts by weight, the transparency of the coating film tends to decrease.

When emulsion-polymerizing the polymerizable unsaturated monomers (b) to (d) in the presence of the urethane dispersion (a), an emulsifier and a polymerization initiator can be used.

The emulsifier used in the present invention is not particularly limited, but it is preferable to use a reactive emulsifier having a polymerizable unsaturated group since the water resistance of the resulting coating film is improved. As such an emulsifier, ADEKA rear soap SE
10N, SE20N, NE10, NE20 (all manufactured by Asahi Denka Kogyo Co., Ltd., commercial product), Aqualon HS10, same HS20, same RN10, same RN20 (all commercial products manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Latemur S -180A (Kao Corporation)
Commercially available products such as manufactured products and commercially available products) can also be used. The amount of the emulsifier used is preferably 0.1 to 10 parts by weight based on 100 parts by weight of the total amount of the polymerizable unsaturated monomers (b) to (d).

The polymerization initiator is not particularly limited, and may be water-soluble or oil-soluble. Examples of the water-soluble polymerization initiator include ammonium persulfate, potassium persulfate, hydrogen peroxide solution, t-butyl hydroperoxide, and azobisamidinopropane hydrochloride. Further, as the oil-soluble polymerization initiator, t-butylcumyl peroxide, benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, diisobutyl peroxydicarbonate, methyl ethyl ketone peroxide, t-butyl peroxy- Two
-Ethyl hexanoate, 2,2'-azobis-isobutyronitrile and the like can be mentioned. These polymerization initiators are
One kind may be used alone or two or more kinds may be used in combination. Further, if necessary, a redox-type polymerization initiator in which a reducing agent such as acidic sodium sulfite, Rongalit, L-ascorbic acid and the like are used in combination with the above-mentioned polymerization initiator can also be used. The amount of the polymerization initiator used is preferably in the range of 0.05 to 10 parts by weight based on 100 parts by weight of the total amount of the polymerizable unsaturated monomers (b) to (d).

If necessary, a chain transfer agent is used,
The molecular weight of the obtained resin composite may be adjusted. As the chain transfer agent, for example, n-dodecyl mercaptan, γ
-Mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropyltriethoxysilane and the like can be mentioned.

The polymerization temperature during the above emulsion polymerization is 2
It is preferably in the range of 0 to 100 ° C.

The average particle diameter of the thus obtained aqueous resin composition of the present invention (for example, with an N4 submicron particle analyzer manufactured by Coulter, at a temperature of 20 ° C., INTENS)
The value obtained by measuring in TY mode, the same applies below) is 5
It is preferably 0 to 500 nm. Average particle size is 5
If it is less than 0 nm, the viscosity of the varnish tends to be high, and if the average particle size exceeds 500 nm, the dispersion stability tends to be insufficient.

The aqueous resin composition of the present invention contains the above-mentioned resin composite, and can be used as an aqueous paint by dispersing the resin composite in water to prepare an aqueous dispersion.

In the water-based paint of the present invention, titanium white, carbon black, cyanine blue, color pigments such as rouge, calcium carbonate, barium sulfate and the like are added to an aqueous dispersion in which the aqueous resin composition of the present invention is dispersed. An enamel paint can be obtained by further adding an extender pigment. It is also possible to use the aqueous dispersion in which the aqueous resin composition of the present invention is dispersed as it is as a clear paint without adding a pigment.

Further, a pigment dispersant, a leveling agent, a defoaming agent, an ultraviolet absorber, a light stabilizer, a thickener, a viscosity adjusting agent, a film forming aid, a pH adjusting agent, a silane coupling agent, methyl silicate or ethyl. It is also possible to improve the performance of the coating material and the resulting coating film by adding a silyl group curing catalyst such as silicates such as silicates or partial condensates of these silicates during or after coating. When these additives are water-soluble or water-dispersible, they can be added as they are, and when they are not water-soluble or water-dispersible, they can be dispersed using an emulsifier or the like.

[0038]

EXAMPLES The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In the following examples,
"Parts" and "%" mean parts by weight and% by weight, respectively, unless otherwise specified.

[Example 1] (Synthesis of aqueous resin composition) A separable flask equipped with a stirrer, a reflux condenser and a thermometer was charged with ion-exchanged water (75).
Section, urethane dispersion (Vividroll PR3
40, Sumika Bayer Urethane Industry Co., Ltd., heating residue 4
0%) 50 parts (20 parts in terms of solid content) and 3 parts of a reactive emulsifier (Aqualon HS10, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) were charged, and the charging solution was heated to 65 ° C. under a nitrogen stream. A mixed liquid of the polymerizable unsaturated monomers (b) to (d) shown below was added dropwise to the prepared liquid over 2 hours. Polymerizable unsaturated monomer (b) Cyclohexyl methacrylate: 30.0 parts Polymerizable unsaturated monomer (c) γ-methacryloxypropyltrimethoxysilane (γ-
MPTMSi): 3.0 parts Polymerizable unsaturated monomer (d) Styrene: 4.0 parts Methyl methacrylate: 10.0 parts Isobutyl methacrylate: 9.0 parts Butyl acrylate: 19.0 parts 2-Hydroxyethyl acrylate: 4.0 parts Methacrylic acid: 1.0 part.

After completion of the dropping, the mixture was heated to 80 ° C. and 5 parts of an aqueous solution of 2% ammonium persulfate was added dropwise over 15 minutes to initiate polymerization. Further, 30 minutes after the initiation of polymerization, 10 parts of a 2% ammonium persulfate aqueous solution was added dropwise over 30 minutes, and the temperature was kept for 2 hours. After cooling the reaction mixture, 2
The pH was adjusted to 7 to 8 by adding 5% aqueous ammonia. In this way, an aqueous resin composition (A-1) containing a resin composite of the urethane dispersion (a) and the polymerizable unsaturated monomers (b) to (d) was obtained as an emulsion. Table 1 shows the characteristic values of the obtained emulsion (heating residue, average particle size of resin composite, pH, minimum film forming temperature).

Example 2 Using the same apparatus as in Example 1, 60 parts of ion-exchanged water and Vividrol PR340 were used.
37.5 parts (15 parts solid equivalent), Aqualon HS10
Three parts were charged and the temperature of this charging liquid was raised to 80 ° C. On the other hand, the polymerizable unsaturated monomers (b) to (d) shown below, as well as 40 parts of ion-exchanged water and Aqualon HS10 1
Parts and 0.5 parts of t-butyl hydroxyperoxide were pre-emulsified using a homomixer to prepare a dropping solution. Polymerizable unsaturated monomer (b) Cyclohexyl methacrylate: 35.0 parts Polymerizable unsaturated monomer (c) γ-methacryloxypropyltrimethoxysilane (γ-
MPTESi): 3.0 parts Polymerizable unsaturated monomer (d) Styrene: 4.0 parts Methyl methacrylate: 10.0 parts Isobutyl methacrylate: 9.0 parts Butyl acrylate: 19.0 parts 2-Hydroxyethyl acrylate: 4.0 parts Methacrylic acid: 1.0 part.

After the charged liquid was stabilized at 80 ° C., 0.1 part of Rongalit was added, and then the pre-emulsified dropping liquid was added to 3 parts.
It was added dropwise at a constant rate over time. After the dropping was completed, the temperature was kept at the same temperature for 2 hours. After cooling, add 25% aqueous ammonia to adjust the pH
Is adjusted to be 7 to 8 and the aqueous resin composition (A-2) containing the urethane dispersion (a) and the resin composite of the polymerizable unsaturated monomers (b) to (d) is used as an emulsion. Obtained. The characteristic values of the obtained emulsion are shown in Table 1.

[Comparative Example 1] A urethane dispersion was not used, and ion-exchanged water 6 was added at the time of preparation.
An emulsion of the aqueous resin composition (C-1) was obtained in the same manner as in Example 2 except that 0 parts and 4 parts of Aqualon HS10 were used. The characteristic values of the obtained emulsion are shown in Table 1.

[Comparative Example 2] The emulsion obtained in Comparative Example 1 (51 parts by weight in terms of solid content) and Bibidol P
R340 (9 parts by weight in terms of solid content) was mixed to prepare an emulsion.

[0045]

[Table 1]

[Examples 4 and 5 and Comparative Example 2] (Production of White Enamel Paint) Examples 1 and 2 and Comparative Example 1,
Using the emulsion obtained in 2, a white enamel paint was prepared by the following procedure.

40.0 parts of titanium white (Taipec CR97, manufactured by Ishihara Sangyo Co., Ltd.), pigment dispersant (Floren TG-
750W, 4.0 parts of Kyoeisha Chemical Co., Ltd., 0.5 part of antifoaming agent (Aqualene 820, Kyoeisha Chemical Co., Ltd.), 15.0 parts of ion-exchanged water and film-forming auxiliary (butyl cellosolve acetate) 4 0.0 part was mixed, glass beads were added to the mixture, and the mixture was dispersed by a paint shaker for 60 minutes.

To the dispersion thus obtained, 60 parts of the emulsion of the aqueous resin composition obtained in Examples 1 and 2 or Comparative Example 1 was added in terms of solid content. Furthermore, as a leveling agent, BYK 348 (Big Chemie Japan Co., Ltd.) 0.5 part, thickener ADECANOL UH540
(Asahi Denka Co., Ltd.) 0.1 part and 5 parts of ion-exchanged water were added to obtain a white enamel paint.

Next, the following coating film performance test was conducted using the obtained white enamel paint.

(Preparation of Test Plate) Each white enamel paint was applied by a bar coater to a tin plate previously coated with a two-component acrylic urethane-based paint so that the dry film thickness was 25 to 35 μm, and the temperature was 65 ° C. at 65 ° C. Allowed to stand for 2 weeks at% RH. The test plate thus obtained was subjected to the gloss, water resistance, accelerated weathering resistance, and coating film flexibility evaluation tests described below.

Also, the condition for leaving after coating is 5
A test plate was prepared in the same manner as above except that the temperature was set to 50 ° C. and 50% RH, and the test plate was subjected to an evaluation test of low-temperature film forming property described later.

(Evaluation of Gloss) With respect to each of the obtained test plates, a 60 degree specular reflectance was measured using a gloss meter (manufactured by Nippon Denshoku Co., Ltd.).

(Evaluation of Water Resistance) Each test plate was immersed in tap water 25
After immersion for 1 month under the condition of ° C, the appearance of the coating film was visually judged.

(Evaluation of accelerated weather resistance) Metal weather
Using a computer (manufactured by Daiplow Intes Co., Ltd.)
The accelerated weather resistance test was performed in order. First, light irradiation time 6:00
, Irradiation intensity 70 mW / cm ², Black panel temperature 6
The test plate is irradiated with light under the conditions of 3 ° C and humidity of 40% RH.
It was At this time, spray the test plate with water for 15 seconds every hour.
I laid Then, stop the light irradiation for 2 hours in the dark,
Black panel temperature 30 ° C, humidity 98% RH, with condensation
It was held under the condition of. Illuminate the above operation as one cycle
Repeated shooting and holding in the dark, after 800 hours
The gloss was measured to determine the gloss retention and the color difference ΔE. Na
The gloss retention was calculated by the following formula.

Gloss retention (%) = (Gloss after predetermined time test) / (Initial gloss) × 100 (Evaluation of flexibility of coating film) Each test plate was cooled to 5 ° C. and DuPont impact 500 g × 30 cm It was evaluated by.

(Evaluation of low-temperature film-forming property) A coating film test plate which had been coated and left under the conditions of 5 ° C. and 50% RH was immersed in tap water at 25 ° C. for 1 month, and then the appearance of the coating film was visually judged. did.

[0057]

[Table 2]

As shown in Table 2, the coating films obtained by using the aqueous resin compositions (A-1 and A-2) of Examples 1 and 2 have water resistance, weather resistance, flexibility, and It was confirmed that all of the low temperature film forming properties were excellent.

On the other hand, the aqueous resin composition (C-1) of Comparative Example 1 containing no urethane dispersion (a).
In the case of, the flexibility of the coating film and the low-temperature film-forming property are insufficient,
Further, in the case of the aqueous resin composition of Comparative Example 2 in which the urethane dispersion (a) and the polymerizable unsaturated monomers (b) to (d) were simply blended, the water resistance, weather resistance and low temperature of the coating film The film forming property was insufficient.

[0060]

As described above, according to the water-based resin composition of the present invention, the film-forming property, the weather resistance and the flexibility of the coating film can be improved by compounding the components (a) to (d). It can be maintained at a high level over a wide temperature range. Therefore,
The aqueous coating composition of the present invention containing the aqueous resin composition makes it possible to form a good coating film even under low temperature conditions.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09D 151/08 C09D 151/08 175/04 175/04 (72) Inventor Kazuro Aizu Hasaki Town, Kashima County, Ibaraki Prefecture Large-capacity Sunayama Goban Ichi Hitachi Chemical Co., Ltd. Yamazaki Plant (72) Inventor Tsutomu Mamiya Hayama-machi, Kashima-gun, Ibaraki Large-capital Sunayama Goban Ichi Hitachi Chemical Co., Ltd. Yamazaki Plant F-term (reference) 4J011 KA03 KA06 KA15 KA18 KA21 KA21 KB08 KB19 KB29 PA95 PB06 PB23 PB24 PB40 PC02 PC06 4J026 AB02 AC35 BA01 BA05 BA07 BA27 BA29 BA43 DB04 DB08 DB15 DB22 FA04 GA08 4J038 CL002 CP091 DG001 MA08 MA10

Claims (2)

[Claims] 1. A polymerizable unsaturated monomer (b) having a cycloalkyl group in an aqueous dispersion in which the urethane dispersion (a) is dispersed.
And the following general formula (1): [In the formula (1), X represents a monovalent hydrocarbon group selected from an alkyl group having 1 to 10 carbon atoms, an aryl group having 1 to 10 carbon atoms and an aralkyl group having 1 to 10 carbon atoms, and Y is an alkoxy group. Group, a hydroxyl group, an acyloxy group, a halogen atom and a phenoxy group, n represents an integer of 0 to 3, and when X or Y is 2 or more, they may be the same or different] Obtained by emulsion-polymerizing the polymerizable unsaturated monomer (c) having a silyl group and the polymerizable unsaturated monomer (d) having neither the cycloalkyl group nor the silyl group. Aqueous resin composition. 2. An aqueous paint containing the aqueous resin composition according to claim 1.