JP2961814B2 - Aqueous paint composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an aqueous coating composition, and more particularly, to an aqueous coating composition having excellent weather resistance, stain resistance, and wet adhesion.

(Prior Art) Conventionally, paints containing a large amount of aromatic organic solvents have been widely used, but in recent years, from the viewpoint of air pollution and resource saving, they have been replaced by synthetic resin emulsion paints that do not use solvents. .

However, in general, an emulsion paint which does not use a solvent, for example, an α, β-ethylenically unsaturated acid such as acrylic acid or methacrylic acid and an acrylate ester such as butyl acrylate or 2-ethylhexyl acrylate or a methacrylic acid such as methyl methacrylate The coating film obtained from the coating composition using the emulsion polymer composition obtained by emulsion polymerization of the polymerizable monomer of the ester with the vehicle is compared with the coating film obtained from the organic solvent-containing coating composition. In addition, the adhesiveness to the substrate was insufficient, and in particular, the adhesiveness to the chalked surface and the wet adhesiveness to the object to be coated were extremely poor.

Various studies have been made to improve such disadvantages, and among them, a water-based paint in which an oil-modified alkyd resin is mixed with a synthetic resin emulsion is well known.

Further, a compound referred to as a wet adhesion aid for improving wet adhesion when producing a synthetic resin emulsion is known.

Wet adhesion aids include aminoalkyl (meth) acrylates, especially dimethylaminoethyl methacrylate, t-butylaminoethyl methacrylate, and ethylenically unsaturated monomers having alkylene urea or alkylene urethane groups.

(Problems to be Solved by the Invention) However, in the case of a water-based paint in which an oil-modified alkyd resin is mixed with a synthetic resin emulsion, wet adhesion to a chalky surface and an object to be coated is improved. When mixed with a synthetic resin emulsion, there is a drawback that the weather resistance is poor due to the dispersant and emulsifier used, and the use of an alkyd resin results in poor stain resistance in the initial stage of drying after coating.

Also, in the case of an aqueous coating composition using an emulsion polymer composition obtained by emulsion polymerization of a wet adhesion aid as a vehicle, the wet adhesion of the coating film is certainly improved, but the weather resistance attributed to the emulsifier is considered. The problem of poor water resistance and stain resistance occurs.

In general, as described above, since the wet adhesion aid contains an amino group in the molecule and is highly cationic, the type of the emulsifier during emulsion polymerization is limited, and a stable emulsion can be obtained unless used in a large amount. This is because it is difficult to be performed. For this reason, applications in which these compositions can be used are limited in the field of paints.

Therefore, development of an aqueous coating composition having both weather resistance, stain resistance and wet adhesion has been desired.

(Means for Solving the Problems) The present inventors have conducted intensive studies to solve the above problems, and as a result, have completed the present invention.

That is, in the present invention, the N-position and / or the N′-position may be substituted with a hydroxyl group and / or a methylol group.
In the presence of an N, N'-alkylene urea (A), an α, β-ethylenically unsaturated acid (B), an amide of an α, β-ethylenically unsaturated acid (C), and (C) Other polymerizable α, β
-An aqueous coating composition characterized by using, as a vehicle, an emulsion polymer composition obtained by emulsion polymerization of an ethylenically unsaturated monomer.

N, N'-alkylene urea (hereinafter abbreviated as "cyclic urea compound") which may be substituted at the N-position and / or N'-position with a hydroxyl group and / or a methylol group used in the present invention (A ) May include those having various structures, for example, N'-methylol-N, N'-ethylene urea, N'-methylol-N, N'-n-propylene urea, N'-methylol-N , N'-iso-propylene urea,
Dimethylol-N, N'-ethylene urea, dimethylol N,
N'-n-propylene urea, dimethylol-N, N'-iso
-Propylene urea (above group I), N, N'-ethylene urea, N, N'-n-propylene urea, N, N'-iso-propylene urea, N'-hydroxy-N, N'-n-propylene Urea, N'-hydroxy-N, N'-ethylene urea, N '
-Hydroxy-N, N'-iso-propylene urea (II
Group) and the like.

The amounts of the dry urea compound used are α, β-ethylenically unsaturated acid (B), α, β-ethylenically unsaturated acid amides (C), and other copolymerizable with (C). 0.1 to 100 parts by weight of the total of α, β-ethylenically unsaturated monomers (hereinafter abbreviated as “α, β-ethylenically unsaturated monomers”)
10.0 parts by weight is preferred. When the amount is less than 0.1 part by weight, the effect of improving the wet adhesion is not remarkably recognized. On the other hand, 10.0
When the amount exceeds the weight part, a decrease in the level of weather resistance and stain resistance is observed.

Α, β-ethylenically unsaturated (B) used in the present invention
Can include those of various structures, such as acrylic acid,
Examples include methacrylic acid, maleic acid or its half-ester compound, fumaric acid or its half-ester compound, itaconic acid or its half-ester compound, crotonic acid, and the like.

In order for the aqueous coating composition of the present invention to have wet adhesiveness, it is essential to use an α, β-ethylenically unsaturated acid, but the amount used has a great effect. The amount used is 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight, per 100 parts by weight of the α, β-ethylenically unsaturated monomer. When the amount is less than 0.1 part by weight, the wet adhesion is not sufficient, and when the amount is more than 10 parts by weight, the wet adhesion is improved, but the weather resistance and stain resistance are impaired.

Although it is not clear why the α, β-ethylenically unsaturated acid contributes to the improvement of wet adhesion, the cyclic urea compound, α,
It is believed that it plays a catalytic role in enhancing the interaction of β-ethylenically unsaturated acids with amides.

The amides (C) of the α, β-ethylenically unsaturated acid used in the present invention may include those having various structures, for example, acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N, N-dimethylacrylamide, N, N-dimethylmethacrylamide, maleamide, fumaramide, diacetone acrylamide, diacetone methacrylamide (above II
Group I), N-methylolacrylamide, N-methylolmethacrylamide, N, N-dimethylolacrylamide, N, N-dimethylolmethacrylamide, dimethylolitaconamide, dimethylolmaleamide, dimethylolfumalamide (above Group IV) ).

The amount of the amide of the α, β-ethylenically unsaturated acid used to obtain the aqueous coating composition of the present invention is 0.2 to 10.0 with respect to 100 parts by weight of the α, β-ethylenically unsaturated monomer. Parts by weight are preferred. When the amount is less than 0.2 parts by weight, the effect of improving wet adhesion is not remarkably recognized. On the other hand, when it exceeds 10.0 parts by weight, a decrease in the level of weather resistance and stain resistance is observed.

The water-based coating composition of the present invention has a characteristic property of improving wet adhesion to a chalked surface or an object to be coated without impairing weather resistance and stain resistance. In order to further improve this characteristic property, N'-methylol-N, N'-ethylene urea, N'-
Methylol-N, N'-n-propylene urea, N'-methylol-N, N'-iso-propylene urea, dimethylol-
When N-methylol type compounds (Group I) such as N, N'-ethylene urea, dimethylol-N, N'-n-propylene urea, dimethylol-N, N'-iso-propylene urea are used, Examples of amides of α, β-ethylenically unsaturated acids include acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N, N-dimethylacrylamide, N, N′-dimethylmethacrylamide, maleic amide, It is preferable to use a non-methylol compound (Group III) such as fumaric acid amide, diacetone acrylamide, or diacetone methacrylamide.

On the other hand, as a cyclic urea compound, N, N'-ethylene urea, N, N'-n-propylene urea, N, N'-iso-propylene urea, N'-hydroxy-N, N'-ethylene urea,
N'-hydroxy-N, N'-n-propylene urea, N '
Non-N, such as -hydroxy-N, N'-iso-propylene urea
-When a methylol type compound (Group II) is used,
As amides of α, β-ethylenically unsaturated acids, N-methylolacrylamide, N-methylolmethacrylamide, N, N-dimethylolacrylamide, N, N-dimethylolmethacrylamide, dimethylolitaconamide,
It is particularly preferable to use methylol type compounds (Group IV) such as dimethylolmaleamide and dimethylolfumaramide.

As described above, when an N-methylol-type compound is used as the cyclized urea compound, a non-methylol-type compound is used as the amide of the α, β-methylene unsaturated acid. When a non-N-methylol type compound is used as the amide compound, a case where a methylol type compound is used as an amide of α, β-ethylenically unsaturated acid,
Without impairing the weather resistance and stain resistance, the improvement in wet adhesion to chalked surfaces and unpainted materials is further improved.

Although the reason is not clear, when this molecular structure is adopted, the cyclic urea compound and the amides of the α, β-ethylenically unsaturated acid are formed by the catalytic action of the α, β-ethylenically unsaturated acid. It is considered that the interaction between the two is further enhanced.

α, β-ethylenically unsaturated monomers copolymerizable with the amides (C) of α, β-ethylenically unsaturated acids include methyl acrylate, ethyl acrylate, butyl acrylate, Acrylates such as ethylhexyl; methacrylates such as methyl methacrylate, ethyl methacrylate and butyl methacrylate; esters of maleic acid, fumaric acid and itaconic acid; vinyl acetate, vinyl propionate and tertiary carboxylic acid Vinyl esters such as vinyl acid; aromatic vinyl compounds such as styrene, α-methylstyrene and vinyltoluene; heterocyclic vinyl compounds such as vinylpyrrolidone; vinyl chloride, acrylonitrile, vinyl ether, vinyl ketone, vinyl amide, etc .; Vinylidene halide compounds such as vinylidene halide; Α-olefins such as len and propylene; and dienes such as butadiene. If desired, a monomer having two or more unsaturated bonds in one molecule such as diallyl phthalate, divinylbenzene, allyl acrylate, and trimethylolpropane trimethacrylate can also be used. Further, those having an unsaturated group such as vinyl sulfonic acid, styrene sulfonic acid, allyl alkyl itaconate sulfate and the like, a sulfonic acid group and a sulfate group, and alkali salts thereof can also be used.

Further, α, β-ethylenically unsaturated monomers having a reactive polar group can be used. For example, glycidyl-based compounds such as glycidyl acrylate, glycidyl methacrylate, and allyl glycidyl ether; vinyl trichlorosilane, vinyl triethoxy silane, vinyl tris (β-
(Methoxyethoxy) silane, silane compounds such as γ-methacryloxypropyltrimethoxysilane; and hydroxyl compounds such as β-hydroxyethyl acrylate and β-hydroxyethyl methacrylate.

Next, a method for producing the aqueous coating composition of the present invention will be described.

That is, a polymerization initiator is added to a mixture of a cyclic urea compound (A) and an emulsifier, and an amide of an α, β-ethylenically unsaturated acid (B) and an α, β-ethylenically unsaturated acid (C )
And a mixture obtained by adding another α, β-ethylenically unsaturated monomer copolymerizable with (C), and the like, while continuously performing an emulsion polymerization reaction to obtain an emulsion polymer composition. Can be Next, the aqueous coating composition of the present invention is produced in exactly the same manner as in the production of ordinary emulsion paints, using this emulsion polymer composition as a vehicle. That is, pigments, fillers,
Aggregates, dispersants, wetting agents, thickeners and / or rheology control agents, defoamers, plasticizers, film-forming aids, organic solvents, preservatives, anti-foaming agents, pH regulators, rust inhibitors, etc. They are selected according to the respective purpose, combined and adjusted to the paint in the usual way.

Known emulsifiers may be used for the production of the emulsion polymer composition.

For example, sodium lauryl sulfate, sodium alkylbenzene sulfonate, sodium dioctyl sulfosuccinate, anionic emulsifiers such as polyoxyethylene alkyl phenyl ether sulfate, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene-poly A nonionic emulsifier such as an oxypropylene block copolymer can be appropriately selected and used.

An important feature of the water-based coating composition of the present invention is that in the production of an emulsion polymer composition, there is a very wide choice in the type and amount of emulsifier used. The emulsion polymer composition of the present invention can be appropriately selected and used from known anionic emulsifiers and nonionic emulsifiers.

In addition, when the amount of the emulsifier used is smaller than the amount of the emulsifier used in ordinary emulsion polymerization, an emulsion which is sufficiently stable and has few aggregates can be obtained.

That is, the emulsifier is used in an amount of 0.1 to 5.0 parts by weight, preferably 0.2 to 3.0 parts by weight, based on 100 parts by weight of the α, β-ethylenically unsaturated monomer.

This is because of the interaction between the cyclic urea compound, the α, β-ethylenically unsaturated acid and the amides of the α, β-ethylenically unsaturated acid, the emulsifying ability of the α, β-ethylenically unsaturated monomer with respect to the α, β-ethylenically unsaturated monomer. It is considered that this was due to the increase in

This effect is obtained when the oil-modified alkyd used as a means for improving the wet adhesion and the synthetic resin emulsion are mixed or when the wet adhesion auxiliary agent used when producing the synthetic resin emulsion has the weather resistance. And remarkably resolve the poor stain resistance.

That is, an anionic emulsifier could hardly be used for the wet adhesion aid due to the cationic nature of the synthesized product itself. For this reason, a large amount of nonionic emulsifier must be used in order to obtain a stable emulsion with few aggregates, so that it has been difficult to seek remarkable improvement in weather resistance and stain resistance.

According to the present invention, as described above, a cyclic urea compound,
It is considered that the interaction between the amides of the α, β-ethylenically unsaturated acid and the α, β-ethylenically unsaturated acid increases the emulsifying ability for the α, β-ethylenically unsaturated monomer. In the production of the polymer composition, even in an amount smaller than the amount of the emulsifier used in the usual emulsion polymerization composition, it is possible to obtain an emulsion which is stable and has less aggregates, and has weather resistance and stain resistance. Can be improved without impairing the wet adhesion.

Further, a water-soluble oligomer or an emulsifier having an α, β-ethylenically unsaturated double bond, a so-called reactive emulsifier, can be used alone or in combination with the above-mentioned emulsifier.

Further, it is also effective to use a water-soluble polymer substance such as polyvinyl alcohol, hydroxyethyl cellulose or the like together with the above-mentioned emulsifier, or to add it to the emulsion after polymerization.

As the polymerization initiator used in the emulsion polymerization, water-soluble and oil-soluble polymer initiators are used, but they may be used alone or in combination.

Examples of the water-soluble polymerization initiator include hydrogen peroxide, ammonium persulfate, potassium persulfate, and sodium persulfate. Examples of oil-soluble polymerization initiators include 2,2'-azobisisobutylnitrile, 2,2'-azobis- (4-methoxy-2,4-dimethylvaleronitrile), and 2,2'-azobis-2,4 -Dimethylvaleronitrile, 1,1'-azobiscyclohexane-cyclohexane-1-carbonitrile, benzoyl peroxide, lauroyl peroxide, dibutyryl peroxide, diacetyl peroxide, dipropionyl peroxide, cumene hydroperoxide and the like. .

Of the above polymerization initiators, it is particularly preferable to use an organic peroxide or hydrogen peroxide from the viewpoint of weather resistance and stain resistance.

A so-called redox initiator composed of a combination of these water-soluble and oil-soluble polymerization initiators and a suitable reducing agent, for example, ascorbic acid, sulfites or sulfoxylates, may be used.

At the time of emulsion polymerization, a chain transfer agent may be used for adjusting the molecular weight. Suitable chain transfer agents include methyl mercaptan, ethyl mercaptan, propyl mercaptan, isopropyl mercaptan, butyl mercaptan,
Mercaptans such as pentyl mercaptan, hexyl mercaptan, octyl mercaptan, decyl mercaptan, undecyl mercaptan, dodecyl mercaptan, stearyl mercaptan, O-mercaptobenzoic acid, mercaptoacetic acid, methanol, ethanol, propanol, isopropanol, butanol, isopropanol Butanol, t-butanol, pentanols and hexanols can be mentioned.

The glass transition temperature of the emulsion polymer composition of the aqueous coating composition of the present invention is preferably in the range of −10 to 40 ° C. from the viewpoints of weather resistance, stain resistance, and wet adhesion.

From the practical viewpoint, the concentration of the emulsion polymerization is preferably such that the solid content of the final composition is 25 to 65% by weight, and the α, β-ethylenically unsaturated monomer and the polymerization initiator are: Any known method such as batch charging, continuous dropping, and divisional addition to the reaction system can be performed.

The temperature at the time of the emulsion polymerization may be within the range of the temperature which has already been carried out by a known emulsion polymerization method. The pressure at the time of the emulsion polymerization may be normal pressure, and the gaseous α, β-ethylenically unsaturated monomer may be used. Is used under pressure.

(Examples) Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to only the following examples. The following parts and percentages are all based on weight.

Example 1 (Production Example 1 of emulsion polymer composition) The following were prepared as raw materials.

Cyclic urea compound N, N'-ethylene urea 10g Polymerizable monomer 2-ethylhexyl acrylate 175g Styrene 200g Methyl methacrylate 105g N-methylolacrylamide 10g Acrylic acid 10g Emulsifier Newcol 707SF (solid content 30%) ^{* 1)} 50g Deionized water 480g Polymerization initiator Ammonium persulfate 2.5g ^{* 1)} Special anion emulsifier manufactured by Nippon Emulsifier Co., Ltd. In a four-necked flask, 10 g of ethylene urea, 5 g of an emulsifier, and 330 g of ion-exchanged water are charged, and stirring is started. 80 in the airstream
C., and then a polymerization initiator was added. Next, 500 g of a polymerizable monomer, 45 g of an emulsifier, and 150 g of ion-exchanged water were mixed to prepare a monomer pre-emulsion, and the monomer pre-emulsion was dropped into the flask over 3 hours. The reaction temperature at this time was kept at 80 ± 30 ° C. After completion of the dropwise addition, the reaction was continued under stirring while maintaining the same temperature range for 2 hours.
The emulsion polymer composition was adjusted to 9 and had a nonvolatile content of 50.0%, a viscosity of 1200 cps and a pH of 8.5.

Using this emulsion polymer composition, an aqueous coating composition was obtained by the following formulation.

Paint formulation Water 10.0 Ethylene glycol (Anti-freezing agent) 2.6 Quinflow 540 1.0 (Dispersant; Nippon Zeon KK product) Nogain EA-120 0.3 (Wetting agent; Daiichi Kogyo Seiyaku KK product) Best Side FΧ 0.01 (Dainippon Ink Chemicals) KK product) JR-600A 36.0 (Titanium oxide; Teikoku Chemical KK product) SN deformer 121 0.4 (Defoamer; Sannopco KK product) Ammonia water (28%) 0.15 Emulsion (50%) 100.0 Texanol 7.0 (Film forming aid; Eastman Chemical product) Cellosize QP-4400 (3%) 9.2 (Thickener; product of Union Carbide) Water 3.75 Total 170.41 NV 51.0% Pigment volume concentration (PVC) 20% Further, in the same manner as in Example 1. Using the raw materials and polymerization conditions shown in Table 1, emulsion polymer compositions (Nos. 2 to 7)
Was synthesized, and a water-based coating composition (Examples 2 to 7) was obtained by the same coating composition as in Example 1. On the other hand, emulsion polymer compositions (Nos. 8 to 13) were synthesized in the same manner as in Example 1 using the raw materials and the polymerization conditions shown in Table 1, and the same paint formulation as in Example 1 The coating compositions (Comparative Examples 1 to 6) were obtained.

The relationship between the emulsion polymer composition, the examples and the comparative examples is as follows.

Example 1 Aqueous paint composition using emulsion polymer composition No. 1 as vehicle Example 2 Aqueous paint composition using emulsion polymer composition No. 2 as vehicle Example 3 Emulsion polymer composition No. 3 Aqueous paint composition using vehicle Example 4 Aqueous paint composition using emulsion polymer composition No. 4 as a vehicle Example 5 Aqueous paint composition using emulsion polymer composition No. 5 as a vehicle Example 6 Emulsion weight Aqueous paint composition using coalescent composition No. 6 as vehicle Example 7 Aqueous paint composition using emulsion polymer composition No. 7 as vehicle Comparative Example 1 Aqueous paint using emulsion polymer composition No. 8 as vehicle Composition Comparative Example 2 Water-based paint composition using emulsion polymer composition No. 9 as a vehicle Comparative Example 3 Water-based paint composition using emulsion polymer composition No. 10 as a vehicle Comparative Example 4 Emulsion polymer composition No. Aqueous coating composition using 11 as vehicle Comparative Example 5 Emulsion polymer composition No. 1 Aqueous coating composition using 2 as vehicle Comparative Example 6 Aqueous coating composition using emulsion polymer composition No. 13 as vehicle Table 2 shows the test results of the coating properties of the aqueous coating compositions of Examples and Comparative Examples.

Test method Stain resistance (1) Outdoor stain resistance: A paint was applied twice to a flexible board with a brush, dried for 7 days, and then subjected to an outdoor backwash test. After one year, the surface condition was observed.

○: good △: slightly dirty ×: large stain (2) Ink contamination: Apply to a glass plate with a 3 mil applicator, dry overnight at 65 ° C and 65% RH at 20 ° C, then 10% of black ink manufactured by KK Pilot Place the solution in a spot on the coating
Leave for 60 minutes.

Thereafter, the ink was wiped off with gauze, and the degree of contamination was determined by a 10-point evaluation method.

 10 points: No ink remains at all 1 point: The ink bleeds into the coating film and remains clearly.

Wet adhesion: A test piece prepared under the same conditions as in the adhesion test was immersed in water overnight, and the state of blistering was determined.
After being taken out of the water, it was dried at 20 ° C. and 65% RH for 3 hours, cross-cut, and evaluated by a cellophane adhesive tape peeling test.

Blistering; ○: No blister at all △: Blister generated on part of sample ×: Blister generated on entire sample Cellophane adhesive tape peeling test; ○: No peeling at all △: Partial peeling ×: Around cellophane adhesive tape Weather resistance; Paint was applied twice to the flexible board with a brush, dried for 7 days, then subjected to an outdoor back-and-forth test, and one year later, the surface condition was observed.

(Effects of the Invention) As can be seen from Table 2, the water-based coating composition of the present invention comprises:
It has good weather resistance and stain resistance, and also exhibits properties of a coating film having wet adhesion.

Therefore, this aqueous coating composition is suitable not only for indoor coating but also for outdoor coating, and can be applied not only to the home coating field but also to the industrial coating field, and is used as a replacement for organic solvent coatings. You can do it.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C09D 133 / 02,133 / 26,5 / 02

Claims (9)

(57) [Claims] (1) N, which may be substituted at the N-position and / or N'-position with a hydroxyl group and / or a methylol group,
Copolymerization of α, β-ethylenically unsaturated acid (B), amides of α, β-ethylenically unsaturated acid (C), and (C) in the presence of N′-alkylene urea (A) Other possible α, β
-An aqueous coating composition, wherein an emulsion polymerization composition obtained by emulsion polymerization of an ethylenically unsaturated monomer is used as a vehicle. 2. The N, N'-alkylene urea (A) has the following group I: And group II The aqueous coating composition according to claim 1, which is at least one compound selected from the group consisting of: 3. The method according to claim 1, wherein the α, β-ethylenically unsaturated acid (B) is acrylic acid, methacrylic acid, maleic acid or a half ester compound thereof, fumaric acid or a half ester compound thereof,
3. The aqueous coating composition according to claim 1, which is at least one compound selected from the group consisting of itaconic acid or a half ester compound thereof, and crotonic acid. 4. The amides (C) of α, β-ethylenically unsaturated acids are represented by the following group III: And IV group 4. The aqueous coating composition according to claim 1, which is at least one compound selected from the group consisting of: 5. N-N-methylol-N, N'-ethylene urea according to claim 2, wherein N, N'-alkylene urea (A) is At least one compound selected from the group consisting of
And an amide (C) of an α, β-ethylenically unsaturated acid is
Group III below Or at least one compound selected from the group consisting of: or N, N'-alkylene urea (A) is the following group II N, N'-ethylene urea according to claim 2; An amide of an α, β-ethylenically unsaturated acid (C), which is at least one compound selected from the group consisting of
The following IV group The aqueous coating composition according to claim 1, which is at least one compound selected from the group consisting of: 6. An α, β-ethylenically unsaturated acid (B),
amides (C) of α, β-ethylenically unsaturated acids;
With respect to 100 parts by weight of the total of other α, β-ethylenically unsaturated monomers copolymerizable with (C) (hereinafter abbreviated as “α, β-ethylenically unsaturated monomer”), N , N'-alkylene urea (A) in an amount of 0.1 to 10.0 parts by weight, α, β-ethylenically unsaturated acid (B) in an amount of 0.2 to 5.0 parts by weight, α, β
The amount of the amide (C) of an ethylenically unsaturated acid is 0.2
The aqueous coating composition according to any one of claims 1 to 5, wherein the amount is from 1 to 10.0 parts by weight. 7. The amount of an emulsifier used for emulsion polymerization is α,
The aqueous coating composition according to any one of claims 1 to 6, wherein the amount is 0.1 to 5.0 parts by weight based on 100 parts by weight of the total amount of the β-ethylenically unsaturated monomer. 8. When emulsion polymerization is carried out, as a radical initiator,
The aqueous coating composition according to any one of claims 1 to 7, wherein an organic peroxide or hydrogen peroxide is used. 9. The emulsion polymer composition having a glass transition temperature of-
The aqueous coating composition according to any one of claims 1 to 8, which is in a range of 10 to 40C.