JPH06200211A - Water-dispersible resin composition and coating agent - Google Patents

Abstract

PURPOSE:To obtain the subject composition which can be dispersed in water without blocking the isocyanate groups and is stable for a long time by mixing an amineimide vinyl copolymer with an isocyanate compound and emulsifying the mixture in water by dispersion. CONSTITUTION:This resin composition is obtained by emulsifying by dispersion a mixture of a vinyl copolymer (A) having amineimide groups in the molecule with an isocyanate compound (B) in water. Further, the resin composition can be obtained by copolymerizing a vinyl monomer having an amineimide group with an vinyl isocyanate monomer and/or polymerizable isocyanate oligomer. This composition contains about 0.5-20wt.% amineimide groups based on the weight of the resin solid and about 0.5-20wt.% isocyanate groups.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-dispersible resin composition and a coating agent, and more particularly to a water-dispersible resin composition containing an isocyanate group stably and a coating agent using the same.

[0002]

2. Description of the Related Art Although coating agents such as paints are shifting from conventional solvent systems to water systems in terms of low pollution, resource saving, safety and health, etc., it is possible to improve physical properties such as water resistance. Aqueous dispersions of reactive resins have been investigated. Examples of the aqueous dispersion of the reactive resin include a blocked isocyanate-based compound obtained by blocking an isocyanate group of a tetramethylxylylene diisocyanate-based compound containing 12% by weight or more of an isocyanate group with an oxime-based compound, a hydration aid, and water. A heat-reactive aqueous composition having an isocyanate group contained therein has been proposed (for example, JP-A-2-133420).

[0003]

However, since the isocyanate group of the above aqueous composition is blocked, it is heated to 120 ° C. or more to dissociate the blocking agent to activate the isocyanate group in order to cure the reaction. However, there are problems such as restriction of the reaction temperature and work environment pollution due to volatilization of the blocking agent, which limits the use.

[0004]

In order to solve the above-mentioned problems, the present inventors disperse water in an isocyanate group without blocking it, and an aqueous dispersion of a resin having an isocyanate group which remains stable for a long period of time. As a result of earnest studies to achieve the above, the present invention has been achieved. That is, the present invention includes a water-dispersible resin composition comprising a vinyl-based copolymer (A) having an amine imide group in the molecule and an isocyanate group-containing compound (B), and the water-dispersible resin composition as essential components. It is a coating agent.

The vinyl copolymer (A) is a vinyl (co) polymer containing the amine imide group-containing vinyl monomer (a) as an essential monomer. Examples of (a) are 1,1,
1-trimethylamine methacrylimide, 1,1-dimethyl-1-ethylamine methacrylimide, 1,1-dimethyl-1- (2-hydroxypropyl) amine methacrylimide, 1,1-dimethyl-1- (2'-phenyl- 2'-hydroxyethyl) amine methacrylimide,
1,1-dimethyl-1- (2′-hydroxy-3′-phenoxypropyl) amine methacrylimide, 1,1,
1-Trimethylamine acrylic imide etc. Japanese Patent Application No. 3-1
The thing described in the specification of 80395 is mentioned. Of these, preferred are 1,1,1-trimethylamine methacrylimide and 1,1-dimethyl-1- (2-hydroxypropyl) amine methacrylimide.

As the isocyanate group-containing compound (B), isocyanate monomers (aliphatic diisocyanate, alicyclic diisocyanate, aromatic diisocyanate, etc.); isocyanate modified products (isocyanurate body, trimethylolpropane adduct, burette body, etc.) An isocyanate prepolymer (for example, a reaction product of a polyether polyol and / or a polyester polyol with an excess of an isocyanate compound); (b
Polymers obtained by vinyl (co) polymerization using 1) and / or (b2) as essential monomers; and mixtures of two or more thereof.

In the present invention, the vinyl copolymer (A) may have both an amine imide group and an isocyanate group in the molecule. As such a vinyl-based copolymer, a polymer obtained by vinyl-copolymerizing (I) (a) with (b1) and / or (b2) as an essential component, (I
I) A polymer obtained by reacting (A) having an active hydrogen group in the molecule with a polyisocyanate to introduce an isocyanate group, and a copolymer obtained by vinyl-polymerizing (III) (b1) and / or (b2) as an essential component. In addition, a polymer obtained by introducing an amine imide group, a polymer obtained by producing a (IV) vinyl-based copolymer, and then introducing an isocyanate group and an amine imide group, and the like. (I) ~
Preferred among (IV) are (I) and (II).

Examples of (b1) in the polymer (I) include, for example, isocyanatoalkyl (meth) acrylate [isocyanatoethyl (meth) acrylate, isocyanatopropyl (meth) acrylate, and (meth) acrylic acid. Isocyanatohexyl, etc.], m-isocyanato (dimethyl) methylmethastyrene, and a reaction product of an organic diisocyanate (1 mol) and a hydroxyalkyl (meth) acrylate (1 mol). Examples of (b2) include polyether diols and / or polyester diols, and optionally both ends NCO prepolymer (1 obtained by the reaction of a chain extender and an excess of diisocyanate.
And a hydroxyalkyl (meth) acrylate (1 mol).

The polymer (II) can be obtained by reacting an excess polyisocyanate compound with (A) containing an active hydrogen group (for example, a hydroxyl group, an amino group or a carboxyl group). As the polyisocyanate compound, the compounds listed as the above (B) can be used, and the preferred compounds are the compounds exemplified in (B) to (B).

The polymer (III) is disclosed in Japanese Patent Application No. 2-197.
No. 037 specification, for example, a vinyl-based (co) polymer obtained by (co) polymerizing methyl methacrylate,
It is obtained by adding 1,1-dimethylhydrazine and propylene oxide and reacting them. The polymer (IV) can be obtained by combining the production methods (II) and (III).

In obtaining the above (A), if necessary,
The following (a) to (a) as a copolymerizable monomer (c)
You may use together the polymerizable monomer or oligomer shown in (wa). (A) (meth) acrylate ester having an alkyl group having 1 to 30 carbon atoms [methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate,
Butyl (meth) acrylate, amyl (meth) acrylate, octyl (meth) acrylate, lauryl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, oleyl (meth) acrylate, etc.] (B) Hydroxyalkyl (meth) acrylate [-2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, (meth) diethylene glycol) Acrylic acid monoester, etc.]; (C) Aromatic vinyl monomer (styrene, α-methylstyrene, etc.); (D) Halogenated vinyl monomer (vinyl chloride, etc.); (V) Alkyl or cycloalkyl vinyl ether ( Methyl vinyl ether, etc.); (f) Vinyl ester (vinyl acetate, etc.); ) Nitrile group-containing monomer (acrylonitrile, etc.); (H) Amido group-containing monomer [(meth) acrylamide, etc.]; (ri) Epoxy group-containing monomer, [(meth) glycidyl acrylate, etc.]; ) A vinyl monomer having a polysiloxane group {CH ₂ =
_{C (CH 3) COO (CH} 2) 3 [Si (CH 3) 2 O] n Si (CH 3) 3 ( wherein _n = 0 to 13
0) etc .; (l) Vinyl-based monomer having a perfluoroalkyl group having 3 to 30 carbon atoms {(meth) acrylic acid ester having a perfluoroalkyl group [CF ₃ (CF ₂ ) ₉ (CH ₂ ) ₂ OCOCH = C
H ₂ etc.], maleic acid mono- or diesters with perfluoroalkyl groups [C ₈ F ₁₇ (CH ₂ ) ₁₁ OCOCH = CHCOOMe etc.], vinyl ethers or allyl ethers with perfluoroalkyl groups [C ₇ F ₁₅ CH ₂ OCH = CH ₂ etc.], vinyl sulfonic acid having a perfluoroalkyl group [C ₈ F ₁₇
SO ₂ NHCH ₂ SO ₂ CH = CH ₂ etc.]; (e) Vinyl-based monomer having an ionic group or an ion-forming group {for example, one imparting cationicity: N, N-dimethyl (meth) acrylate Those which impart anionic property such as aminoethyl, N, N-dimethylaminoethyl (meth) acrylamide, (meth) acryloyloxyethyltrimethylammonium chloride: vinylcarboxylic acid [(meth) acrylic acid, maleic acid, etc.], vinylsulfone Acid, styrene sulfonic acid, (meth) acrylic sulfonic acid [sulfo (ethyl meth) acrylate, etc.], (meth) acrylamide sulfonic acid [2-acrylamide-
2-methylpropanesulfonic acid, etc.] Japanese Patent Application No. 3-1
80395}} and (wa) a polymerizable oligomer having a vinyl group {polyurethane, polyether, polyamide, epoxy resin, polyester or other oligomer having one or more polymerizable double bonds introduced therein. , For example, an esterified product of polycaprolactone diol and (meth) acrylic acid [eg Praxel FM-1 (manufactured by NOF Corporation)], an ester of polyethylene glycol and (meth) acrylic acid [eg Bremmer PE-200 (manufactured by NOF CORPORATION)] ], A reaction product of a prepolymer of polytetramethylene glycol and isophorone diisocyanate (OH at both ends) (1 mol) and isocyanatoethyl acrylate (1 mol), a reaction product of polyamide and (meth) acrylic acid, epoxy Japanese Patent Application No. 3-1 such as a reaction product of resin and (meth) acrylic acid Those described in the specification of No. 80395}.

When (c) is used, preferred are (a), (c), (o) and (wa) among those exemplified above, and particularly preferred are (meth) of (o). Acrylic acid and (N) N-dimethylaminoethyl (meth) acrylate, methyl methacrylate and n-butyl acrylate in (a), and styrene in (c). When (e) is used, (A) having an ionic group or an ion-forming group in the molecule is obtained, so that the emulsifiability of the copolymer in water can be further improved, which is preferable. . Further, when a vinyl monomer having a perfluoroalkyl group having 6 to 30 carbon atoms is used in (nu), the water repellency of the resulting coating film can be improved and (lu) is used. In that case, the surface friction coefficient of the obtained coating film decreases and the releasability is exhibited.

The content of amine imide group in the solid content of the composition of the present invention is usually 0.5 to 20% by weight, preferably 1 to 10%, and the content of isocyanate group is usually 0.5 by weight. -20%, preferably 1-10%. If the content of the amine imide group is less than 0.5%, the storage stability of the water-dispersible resin composition will be poor, and if it exceeds 20%, there is no further effect of improving the storage stability, which is uneconomic.
Further, when the isocyanate group content is less than 0.5%, the curability of the coating film becomes insufficient and the coating performance such as water resistance becomes poor, and when it exceeds 20%, the storage stability of the water-dispersible resin composition becomes poor. descend.

The method for polymerizing the vinyl copolymer (A) in the present invention is not particularly limited, and examples thereof include a method in which a known polymerization initiator is used in an organic solvent.

Examples of the organic solvent include aromatic hydrocarbons (toluene, xylene, etc.), aliphatic hydrocarbons (hexane, etc.), aliphatic esters (ethyl acetate, butyl acetate, etc.), aliphatic ketones (acetone, methyl ethyl ketone, etc.), Included are aliphatic ethers (dioxane, tetrahydrofuran, etc.) and mixtures of two or more thereof.

As the polymerization initiator, known azo compounds [azobisisobutyronitrile, 2,2'-azobis (2,2
4-dimethylvaleronitrile), azobiscyanovaleric acid, 2,2-azobis (2-amidinopropane) acetate, etc.], organic peroxide [benzoyl peroxide, di-t-
Butyl peroxide, cumene hydroperoxide, etc.] and a combination of two or more thereof. The amount of the polymerization initiator used is usually 0.00 based on the total weight of the monomers.
It is 1 to 10% by weight, preferably 0.1 to 5% by weight.

If necessary, a known chain transfer agent (n-
Lauryl mercaptan, n-dodecyl mercaptan, t
-Dodecyl mercaptan, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, etc.) can be added to control the molecular weight of the polymer.

The reaction temperature of the polymerization reaction is usually 50 to 150.
C., preferably 70 to 130.degree. The reaction time is usually 1 to 10 hours, preferably 2 to 7 hours. The end point of the polymerization is the double bond absorption (16
It can be confirmed by disappearance of 48 cm ⁻¹ ) or reduction of unreacted monomer by gas chromatography.

The weight average molecular weight of the vinyl copolymer (A) thus obtained is usually 1,000 to 100,
000, preferably 3,000 to 60,000.

The water-dispersible resin composition of the present invention can be obtained by dispersing and emulsifying a mixture of (A) and (B) or (A) containing an isocyanate group in the molecule in water.
As the emulsification method, there are a method of distilling the solvent after the solution polymerization and emulsifying the remaining resin, and a method of emulsifying water by adding the solution as it is, and then distilling the solvent if necessary, but in a solution state. The method of emulsification is preferred. Emulsification temperature is usually 5-5
0 ° C., preferably 10 to 40 ° C. When the solvent is distilled off after emulsification, it is preferably carried out at 70 ° C. or lower under reduced pressure. If necessary, an emulsifier, a pH adjusting agent, etc. can be added within a range that does not impair the storage stability of the composition and the coating film performance. Examples of the emulsifier include anionic surfactants such as alkyl sulfate ester salts, alkylaryl sulfonates, alkyl phosphate ester salts and fatty acid salts; cationic surfactants such as alkylamine salts and alkyl quaternary ammonium salts; polyoxyethylene. Examples include nonionic surfactants such as alkylaryl ethers, polyoxyethylene alkyl ethers and pluronic type; amino acid type or betaine type amphoteric surfactants.

When (A) or (B) contains a cation-forming group, the addition of an acid improves the hydrophilicity and helps emulsify the mixture of (A) and (B). The acid may be an organic or inorganic acid such as hydrochloric acid, phosphoric acid, sulfuric acid,
Examples thereof include nitric acid, formic acid, acetic acid, propionic acid, lactic acid, (meth) acrylic acid, oxalic acid, citric acid, maleic acid, itaconic acid and adipic acid. When it contains an anion-forming group, addition of a base such as amine (ammonia, methylamine, dimethylamine, diethanolamine, dimethylaminoethanol, triethylamine, etc.) or alkali (KOH, NaOH, etc.) improves the hydrophilicity and emulsifies the emulsion. To help. The amine imide group is amphoteric and the hydrophilicity is improved by adding either acid or base.
The addition amount of the acid or base is usually 0.3 to 1.5 times equivalent to the total equivalent of the amine imide group and the ion-forming group.

The resin composition of the present invention is a colloidal or emulsion-like aqueous dispersion, and the isocyanate group is held stable over a long period of time. That is, in the state of being dispersed in water, the hydrophobic isocyanate group is in the micelle and is stably retained by being blocked from water, but when it is formed into a coating film, the water is volatilized to destroy the micelle, and the isocyanate group and water or The reaction with the active hydrogen in the resin occurs and crosslinks.

If desired, the water-dispersible resin composition of the present invention may contain other emulsions (eg, acrylic emulsion,
(Urethane emulsion, epoxy emulsion, etc.) can be mixed. In addition, pigments usually added as paints, various additives (UV absorbers, antioxidants, heat resistance improvers, leveling agents, film-forming auxiliaries, anti-sagging agents, matting agents, curing accelerators, etc.) It may be contained.

As the pigment, an extender pigment (calcium carbonate,
Kaolin, talc, aluminum silicate, aerosil, etc.),
Inorganic pigments (titanium oxide, iron oxide, yellow lead, cadmium oxide, carbon black, aluminum flakes, etc.), organic pigments (azo, azo lake, phthalocyanine, quinacridone, isoindolinone organic pigments, etc.) To be

As a method for blending the above-mentioned other emulsions, pigments, various additives and the like with the water-dispersible resin composition of the present invention, usual stirring and mixing devices (paint conditioner, ball mill, kneader, sand grinder) are used. , Roll mill, flatstone mill, etc.).

When the water-dispersible resin composition of the present invention is used as a coating agent, examples of its coating method include brush coating, roll coating, spray coating, flow coating and dipping. After being applied, it can be cured by standing at room temperature or by heating at about 60 to 120 ° C.

[0027]

The present invention will be further described with reference to the following examples.
The present invention is not limited to this. In the following, "part" means "part by weight" and "%" means "% by weight".

Production Example 1 30 parts of 80 parts of methyl ethyl ketone (hereinafter abbreviated as MEK)
It was charged in 0 ml of four-necked Kolben and heated to 79 ° C. with stirring. Then, a mixed solution containing the components of the following formulation was added dropwise in a nitrogen gas stream over 3 hours. [Formulation] 1,1-dimethyl-1- (2-hydroxypropyl) amine methacrylimide (hereinafter abbreviated as AI) 10 parts Acrylic acid (hereinafter abbreviated as AA) 7 parts Methyl methacrylate (hereinafter abbreviated as MMA) 25 parts Acrylic N-Butyl acid (hereinafter abbreviated as BA) 30 parts Cetyl methacrylate (hereinafter abbreviated as CMA) 15 parts n-Butyl methacrylate (hereinafter abbreviated as BMA) 13 parts n-lauryl mercaptan (hereinafter abbreviated as LM) 1 part Azobis Isovaleronitrile (hereinafter abbreviated as AIVN) 1 part MEK 20 parts After the completion of dropping, the mixture was reacted for 2 hours at the same temperature, and then AIVN0.
Two parts were added, and the reaction was further continued for 2 hours to obtain a MEK solution of the vinyl copolymer (A) (polymerization rate 96%, solid content 48.2).
%) [A-1] was obtained.

Production Example 2 100 parts of polycaprolactone triol (number average molecular weight 2,000), 100 parts of polycaprolactone diol (number average molecular weight 1,000) and 500 parts of 2-hydroxyethyl methacrylate (hereinafter abbreviated as HEMA) in 500 ml of Kolben. 6.5 parts and n-propyl acetate (112 parts) were charged and the atmosphere was replaced with nitrogen. Then, 56 parts of isophorone diisocyanate (IPDI) was added dropwise, 0.01 part of dioctyltin mercaptide was added, and the mixture was reacted at the same temperature for 6 hours to obtain a urethane oligomer having an isocyanate group and a vinyl group (solid content 70%, abbreviated as UOG). [B-1] was obtained. The NCO content of this product is 1.7.
%Met.

Production Example 3 MEK solution of vinyl copolymer (polymerization rate 96%, solid content 48%) [C
-1] was obtained. [Prescription] AA 7 parts, MMA 30 parts, BA 35 parts,
CMA 15 parts, BMA 13 parts, LM 1 part, AIV
N 1 part and MEK 20 parts.

Example 1 ME of (A) was prepared by the following [prescription] in the same manner as in Production Example 1.
A K solution (polymerization rate 96%, solid content 48%) was obtained. [Prescription] 5 parts of AI, 10 parts of isocyanate ethyl methacrylate (hereinafter abbreviated as MOI), 7 parts of AA, MMA
20 parts, BA 40 parts, BMA 18 parts, LM 1
Parts, 1 part of AIVN and 20 parts of MEK. Triethylamine (hereinafter TEA) was added to this solution at 30 ° C or lower.
Abbreviated as 10.0 g part, and after mixing well, water 30
0 part was gradually added to form an emulsion. Next, MEK was distilled off under reduced pressure at 50 ° C. or lower, and finally adjusted with water to obtain a water-dispersible resin composition [1] of the present invention having a solid content of 30%. The NCO content of this product was 0.72%.

Example 2 In the same manner as in Example 1 with the following [formulation], the solid content was 30%.
To obtain a water-dispersed resin composition [2]. NCO of this thing
The content was 1.1%. [Prescription] AI 7 parts, MOI 15 parts, AA 5 parts, M
MA 28 parts, BA 30 parts, methacrylate-n-cetyl (hereinafter abbreviated as CMA) 15 parts, LM 1 part, AIVN
1 part, 20 parts of MEK and 8.7 parts of TEA.

Example 3 80 parts of MEK was charged into a 300 ml four-necked Kolben and heated to 79 ° C. with stirring. Then, a monomer mixed solution having the following formulation was added dropwise in a nitrogen gas stream over 3 hours. [Prescription] AI 5 parts, AA 8 parts, MMA 25 parts, B
A 30 parts, CMA 15 parts, HEMA 5 parts, LM
1 part, 1 part of AIVN and 20 parts of MEK. After the dropping was completed, the reaction was carried out at the same temperature for 2 hours, and then AIVN0.
Two parts were added and the reaction was continued for another 2 hours. Further IPDI2
Add 0 part and 0.01 part dioctyl tin mercaptide to 80
By reacting at 6 ° C. for 6 hours, a MEK solution (solid content 36.5%) of [A] containing an isocyanate group was obtained. 3 in this solution
After adding 11.1 parts of TEA at 0 ° C or lower and mixing well,
300 parts of water was gradually added to emulsify to form an emulsion.
Next, MEK was distilled off under reduced pressure at 50 ° C. or lower, and finally adjusted with water to obtain a water-dispersible resin composition [3] of the present invention having a solid content of 30%. The NCO content of this product was 1.6%.

Example 4 The solid content was 30% in the same manner as in Example 1 with the following [formulation].
To obtain a water-dispersed resin composition [4]. NCO of this thing
The content was 0.2%. [Prescription] AI 7 parts, UOG 42.9 parts, AA 5
Part, MMA 23 parts, BA 20 parts, CMA 5 parts, L
M 1 part, AIVN 1 part, MEK 20 part and TE
A 8.7 copies.

Example 5 100 parts of [B-1] obtained in Production Example 2 and IPDI16
Then, 7.6 parts of TEA was further added and mixed at 40 ° C. or lower, and then 200 parts of water was added dropwise to emulsify to obtain an emulsion. Next, MEK was distilled off under reduced pressure at 50 ° C. or lower to obtain a water-dispersible resin composition [5] having a solid content of 30%. The NCO content of this product was 2.5%.

Example 6 100 parts of [A-1] obtained in Preparation Example 1 and 20 parts of hexamethylene diisocyanate (HDI) were mixed, and 7.6 parts of TEA was further added at 40 ° C. or lower as in Example 5. After mixing, 200 parts of water was added dropwise to emulsify to obtain an emulsion. Next, MEK was distilled off under reduced pressure at 50 ° C. or lower to obtain a water-dispersible resin composition [5] having a solid content of 30%. The NCO content of this product was 4.0%.

Comparative Example 1 Solid content 30% in the same manner as in Example 1 with the following [formulation]
Comparative Example [1] of the water-dispersed resin composition of was obtained. The NCO content of this product was 1.1%. [Prescription] MOI 15 parts, AA 5 parts, MMA 32
Part, BA 33 parts, CMA 15 parts, LM 1 part, AI
1 part VN, 20 parts MEK and 7.0 parts TEA.

Comparative Example 2 100 parts of [C-1] obtained in Production Example 3 and IPDI16
The resulting mixture was mixed with 5.0 parts of TEA at 40 ° C. or lower, mixed, and then emulsified while dropping 200 parts of water to obtain an emulsion. Then, MEK was distilled off under reduced pressure at 50 ° C. or lower to obtain a water-dispersible resin composition having a solid content of 30% as Comparative Example [2]. The NCO content of this product was 2.2%.

After the water-dispersible resin compositions of Examples 1 to 6 and Comparative Examples 1 and 2 were stored at 25 ° C. for 1 month in a sealed state, the appearance properties and NCO content were measured. The results are shown in Table 1. Each sample was spray-coated on a white coated steel plate (dry film thickness was 20 to 30 µm), and the physical properties of the coating film cured under the conditions shown in Table 2 were measured. The results are shown in Table 2. The stability of the isocyanate group of the water-dispersible resin composition of the present invention is good, and the cured coating film shows good physical properties.

[0040]

[Table 1]

[0041]

[Table 2]

The test methods for each evaluation item shown in Table 2 are as follows. Hardness: Pencil hardness Uses Mitsubishi Uni-Pencil. Solvent resistance: Xylene rubbing 20 times ◯: No abnormality, Δ: Some abnormality, ×: Melt flexibility: Deupon type impact resistance tester, load 300 g,
cm Adhesion: Cross-cutting method, 2 mm square, 25 pieces of cellophane tape peeled. ◯: 25/25, Δ: 10-20 / 25, ×: 0
5/25

[0043]

The water-dispersible resin composition of the present invention has the following effects. (1) Despite containing a free isocyanate group,
Good storage stability in water dispersion. (2) A coating film is formed by evaporation of water and cured at room temperature.
Curing can be accelerated by heating. (3) The cured film exhibits excellent solvent resistance, flexibility, acid resistance, and other physical properties. (4) Good adhesion to various inorganic / organic substrates. The water-dispersible resin composition of the present invention is suitable as a coating agent, for example, a paint, a cross-linking agent, a paint or an adhesive primer because it exhibits the above effects. Examples of specific applications include interior and exterior paints for building materials (eg, inorganic materials such as glass, slate, ceramics, metals such as aluminum, woodworking, plastics, etc.), paints for vehicles (topcoat, topcoat, middlecoat, undercoat, etc.) , Paints for vehicle parts, electrodeposition paints, chipping paints, paints for home appliances and other plastics, paints for acid rain, anticorrosion paints, hard coating agents, can coating agents, PVC sheet coating agents, paper coating agents, fibers Treatment agents, crosslinking agents for various water-based paints and resins, adhesives for lamination, primers for plastic films, and the like.

Claims (6)

[Claims] 1. A vinyl copolymer (A) having an amine imide group in the molecule and an isocyanate group-containing compound (B).
A water-dispersible resin composition comprising: 2. A vinyl-based monomer (a) containing an amine imide group and a vinyl-based monomer (b) containing an isocyanate group.
The water-dispersible resin composition according to claim 1, which is obtained by copolymerizing 1) and / or the isocyanate group-containing polymerizable oligomer (b2). 3. The water-dispersible resin composition according to claim 1, wherein (A) contains an active hydrogen group having reactivity with an isocyanate group. 4. 0.5 to 20% of amine imide groups and 0. 0% of isocyanate groups based on the weight of resin solids.
The water-dispersible resin composition according to claim 1, which contains 5 to 20%. 5. The water-dispersible resin composition according to claim 1, which is obtained by substituting the organic solvent of the resin solution with an aqueous medium. 6. A coating agent containing the water-dispersible resin composition according to claim 1 as an essential component.