Aqueous coating composition, film and base material with film

Abstract

To provide an aqueous coating composition which enables formation of a film that has a large value of 60-degree glossiness, is excellent in transparency and antiviral property, and prevents discoloration (excellent in light resistance).SOLUTION: An aqueous coating composition contains an anionic or nonionic resin (a), an anionic or nonionic organic antiviral agent (b), and a nonionic dispersant (c), and has a pH of 6.8 to 11.0.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a water-based paint composition, a coating, and a coated substrate. [Background technology]

[0002] For various substrates such as building materials and everyday items, a method has been proposed in which a coating formed from a paint composition containing an antiviral agent is provided to impart antiviral properties to the substrate.

[0003] As the coating composition, coating compositions using inorganic antiviral agents are known (for example, Patent Documents 1 and 2). As the antiviral agent, organic antiviral agents are also known. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-106876 [Patent Document 2] Japanese Patent Application Publication No. 2023-51039 Summary of the Invention [Problem to be solved by the invention]

[0005] However, it has been found that when the inorganic antiviral agent is used, discoloration is more likely to occur due to insufficient light resistance than when an organic antiviral agent is used, resulting in problems such as limitations on the color of the coating formed and on the locations where the agent can be applied. Furthermore, coatings formed from coating compositions containing conventional antiviral agents as described in Patent Documents 1 and 2 above have room for improvement in terms of 60-degree gloss and transparency.

[0006] Furthermore, from the viewpoints of environmental conservation, such as preventing sick house syndrome, and safety in the working environment, as well as safety, such as being a non-hazardous material that is easy to store and does not pose a risk of fire, there is a demand for water-based coating compositions with a reduced content of volatile organic compounds (VOCs) that form the coatings described above. In particular, paint compositions for on-site painting in residential spaces and the like are required to have the above safety features, and therefore there is an increasing demand for the use of water-based paint compositions.

[0007] The present invention has been made in view of the above, and aims to provide an aqueous coating composition that can form a coating film that has a high 60-degree gloss value, excellent transparency and antiviral properties, and is resistant to discoloration (excellent light resistance). [Means for solving the problem]

[0008] The present inventors have conducted extensive research to solve the above-mentioned problems. As a result, they have found that the above-mentioned problems can be solved by the following configuration examples, and have completed the present invention. The configuration examples of the present invention are as follows.

[0009] [1] An anionic or nonionic resin (a), an anionic or nonionic organic antiviral agent (b); Nonionic dispersant (c) and Contains A water-based coating composition having a pH of 6.8 to 11.0.

[0010] [2] The aqueous coating composition according to [1], wherein the nonionic dispersant (c) is an ether-type dispersant. [3] The aqueous coating composition according to [1] or [2], wherein the nonionic dispersant (c) has an HLB value of 5.0 to 12.0.

[0011] [4] A coating formed from the water-based coating composition according to any one of [1] to [3]. [5] The coating according to [4], wherein the coating has a 60 degree gloss of 100 or more. [6] The coating according to [4] or [5], wherein the haze value of the coating is less than 10%.

[0012] [7] A coated substrate comprising a substrate and the coating according to any one of [4] to [6]. [Effects of the Invention]

[0013] The aqueous coating composition of the present invention can form a coating that has a high 60° gloss value (e.g., 100% or more), excellent transparency and antiviral properties (particularly antiviral properties against enveloped viruses such as influenza virus and non-enveloped viruses such as feline calicivirus (a norovirus substitute)), and is resistant to discoloration (excellent light resistance). Therefore, the aqueous coating composition of the present invention can be suitably used for substrates (substrates) that require these effects. Furthermore, the present invention can provide a water-based coating composition that has excellent appearance.

[0014] The viruses that are the targets of the antiviral activity are not particularly limited, and include various viruses regardless of the type of genome, whether they have an envelope, or the like. Examples of the enveloped virus include influenza viruses such as avian influenza virus, human influenza virus, and swine influenza virus, hepatitis B virus or C virus, human immunodeficiency virus, varicella-zoster virus, herpes simplex virus, human herpes virus, mumps virus, respiratory syncytial virus, and Ebola virus. Examples of the non-enveloped viruses include norovirus, rotavirus, adenovirus, hepatitis A virus, poliovirus, and coxsackievirus. [Brief explanation of the drawings]

[0015] [Figure 1]The left side of Figure 1 is a photograph of a substrate coated with the water-based coating composition prepared in Example 1, and the right side of Figure 1 is a photograph of a substrate coated with the water-based coating composition prepared in Comparative Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0016] ≪Water-based paint composition≫ The aqueous coating composition according to the present invention (hereinafter also referred to as "the composition") contains an anionic or nonionic resin (a) [hereinafter also referred to as "component (a)"; the same applies to other components], an anionic or nonionic organic antiviral agent (b), and a nonionic dispersant (c), and has a pH of 6.8 to 11.0.

[0017] One of the features of the present composition is that it uses a nonionic dispersant, rather than a cationic, anionic, or amphoteric dispersant, together with the components (a) and (b), particularly with the organic component (b), and thereby achieves the above-mentioned effects. The reason for this is not entirely clear, but it is thought that when a cationic, anionic, or amphoteric dispersant is used together with component (b), it is unable to fully exert its effect as a dispersant (compatibilizer) for component (b) in a coating from which the water has evaporated. On the other hand, component (c) tends to exhibit hydrophilicity even after the water has evaporated, and therefore is able to fully exert its effect as a dispersant (compatibilizer) for component (b) even in a coating from which the water has evaporated.

[0018] As described below, it is preferable to use liquid components (aqueous solutions or aqueous dispersions) as the raw materials for the present composition for the components (a) and (b). When using such liquid components, the present inventors conducted extensive research and found that if cationic or amphoteric components are used as the components (a) and (b), the resulting composition becomes gel-like or precipitates, making it difficult to use as a paint. Therefore, one of the features of the present composition is that anionic or nonionic components are used as the components (a) and (b). In addition, when a liquid component is used as the other component described below in the present composition, the component is also preferably an anionic or nonionic component. On the other hand, when a powder component is used, the powder component does not have ionicity, so there is no particular restriction on the ionicity of the powder component.

[0019] The pH of the present composition is 6.8 to 11.0, preferably 7.0 to 10.5, more preferably 7.2 to 10.0, and particularly preferably 7.5 to 9.0. When the pH of the present composition is within the above range, gels, precipitates, and separation of the components in the present composition are less likely to occur, and better film performance can be achieved when the composition is formed into a (cured) film. The pH of the present composition tends to depend on the pH of component (a) below, and the influence of components other than component (a) below tends to be minor. Therefore, by using a component whose pH is near the above range as component (a) below, the present composition can be easily obtained with a pH in the above range. Specifically, the pH is the pH of the present composition at 23° C. measured by the method described in the Examples below.

[0020] The present composition is a water-based paint composition, and the water-based paint composition refers to a composition in which constituent components such as components (a) to (c) are dispersed and / or dissolved in water or a medium containing water as the main component (aqueous medium). The water content in the present composition is preferably 35 to 95 mass %, more preferably 50 to 85 mass %.

[0021] <Component (a)> Component (a) is not particularly limited as long as it is an anionic or nonionic resin, and may be selected appropriately depending on the type of substrate to be coated. However, an anionic resin is preferred because it can easily form a coating that has excellent adhesion to the substrate. Furthermore, the component (a) is preferably a resin that can be used in a water-based coating composition and has film-forming ability. The component (a) used in the present composition may be one type or two or more types.

[0022] Specific examples of component (a) include (meth)acrylic resins, (meth)acrylic silicone resins, urethane resins (including polyether urethane resins, polyester urethane resins, etc.), fluororesins, epoxy resins, polyester resins, alkyd resins, melamine resins, vinyl acetate resins, silicone resins, and vinyl acetate-Vevo resins. Among these, (meth)acrylic resins, urethane resins, and silicone resins are preferred because they can easily form coatings that have excellent scratch resistance and stain resistance, and (meth)acrylic resins are particularly preferred from the standpoint of cost.

[0023] The pH of the liquid obtained by dissolving or dispersing the component (a) in water so that the (resin) content is 30 to 70 mass % is preferably 6.8 to 11.0, more preferably 7.0 to 10.5, even more preferably 7.2 to 10.0, and particularly preferably 7.5 to 9.0. When component (a) having a pH within the above range is used, gels, precipitates, and separation of the components in the composition are less likely to occur, and better film performance can be achieved when the composition is formed into a (cured) coating. Specifically, the pH is a value measured at 23° C. by the method described in the Examples below.

[0024] The weight average molecular weight (Mw) of component (a) is preferably 5,000 to 300,000, more preferably 30,000 to 100,000, from the viewpoint of being able to easily form a coating film with high strength. The Mw can be measured by gel permeation chromatography (GPC).

[0025] The glass transition temperature (Tg) of component (a) is preferably 120°C or lower, more preferably 100°C or lower, and even more preferably 80°C or lower, with the lower limit being preferably -50°C, in order to avoid the need for a long curing period and to facilitate the production of a coating composition with excellent drying properties. In the present invention, Tg can be measured by DSC (differential scanning calorimetry), but it can also be approximately calculated using the following Fox formula described in Fox TG, Bull. Am. Physics Soc. 1, 3, p. 123 (1956).

[0026]

number

[0027] Tg n For example, the values ​​described in Polymer Handbook 2nd Edition, J. Wiley & Sons, New York (1975) can be used as reference.

[0028] The minimum film-forming temperature (MFT) of component (a) is preferably -30 to 100°C, more preferably -20 to 90°C, since a long curing time is not required and a coating composition with excellent drying properties can be easily obtained. The MFT in the present invention is a value measured by the temperature gradient plate method of ISO standard 2115 using a thermal gradient type MFT measuring device (manufactured by Imoto Machinery Co., Ltd.).

[0029] The content of component (a) is preferably 60 to 98 mass%, more preferably 65 to 96 mass%, and particularly preferably 70 to 95 mass%, relative to 100 mass% of the solid content of the composition, from the viewpoints that a coating composition with excellent drying properties can be easily obtained, and a coating with excellent adhesion to the substrate and excellent scratch resistance, flexibility, impact resistance, and hardness can be easily formed.

[0030] In the present invention, the solid content refers to the heating residue obtained in accordance with JIS K 5601-1-2:2008 (heating temperature: 105°C, heating time: 60 minutes). The solid content of the present composition also refers to the components that make up the coating film formed from the present composition.

[0031] As component (a) used as a raw material for the present composition [component (a) used when preparing the present composition], an aqueous dispersion of the resin, particularly an emulsion, is preferred, and a (meth)acrylic resin emulsion or a urethane resin emulsion is even more preferred, because the present composition, which is an aqueous coating composition, can be easily prepared and a coating having the desired physical properties can be easily formed. (Meth)acrylic resin emulsions and urethane resin emulsions are room temperature curing resin components. Therefore, when a (meth)acrylic resin emulsion or a urethane resin emulsion is used as component (a), a coating can be formed by drying (at room temperature) without adding a curing agent to the present composition.

[0032] From the viewpoint of the stability of the emulsion, the solid content in the emulsion is preferably 30% by mass or more, more preferably 35% by mass or more, and preferably 70% by mass or less, more preferably 60% by mass or less.

[0033] The average particle size of the resin in the emulsion is preferably 1.0 to 1000 nm, more preferably 10 to 500 nm, from the viewpoints of excellent emulsion stability and easy production of the present composition having excellent film-forming properties. The term "average particle size" in this specification refers to the particle size (median size, d50) corresponding to 50% of the volume-based cumulative particle size distribution measured based on the "Particle size analysis - Laser diffraction and scattering method" specified in JIS Z 8825:2013.

[0034] The viscosity of the emulsion is preferably 40 to 1500 mPa·s, more preferably 70 to 500 mPa·s, from the viewpoint that the present composition having excellent film-forming properties can be easily obtained.

[0035] The water dispersion (emulsion) is a dispersion in which a resin is dispersed in a dispersion medium containing water (hereinafter also referred to as an "aqueous medium"). The aqueous medium is not particularly limited as long as it contains water, but the content of water in the aqueous medium is preferably 50 to 100% by mass, more preferably 60 to 100% by mass.

[0036] The aqueous medium may contain a medium other than water, and examples of such a medium include acetone, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, diacetone alcohol, dioxane, ethylene glycol, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monohexyl ether. These may be used alone or in combination of two or more.

[0037] The emulsion can be prepared, for example, by emulsifying the resin with a surfactant or the component (c) described below, or by directly emulsion polymerization of the monomers that form the resin. The surfactant may be, for example, an anionic surfactant. One or more of the surfactants and the component (c) described below may be used.

[0038] (Meth)acrylic resin emulsion Examples of the (meth)acrylic resin emulsion include conventionally known emulsions obtained by emulsion polymerization in one or more stages of polymerizable unsaturated monomer components containing one or more (meth)acryloyl compounds as essential components and, if necessary, one or more other polymerizable unsaturated monomers, in the presence of water and a dispersion stabilizer.

[0039] Examples of the (meth)acryloyl compound include linear or branched alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and isostearyl (meth)acrylate; cyclohexyl (meth)acrylate, methyl cyclohexyl (meth)acrylate, and the like. Alicyclic alkyl (meth)acrylates such as cyclohexyl (meth)acrylate, t-butylcyclohexyl (meth)acrylate, isobornyl (meth)acrylate, and adamantyl (meth)acrylate; aralkyl (meth)acrylates such as benzyl (meth)acrylate; alkoxyalkyl (meth)acrylates such as 2-methoxyethyl (meth)acrylate and 2-ethoxyethyl (meth)acrylate; hexafluoro-i-propyl (meth)acrylate, perfluorooctylmethyl (meth)acrylate, and perfluorooctylethyl Fluoroalkyl (meth)acrylates such as 2-(meth)acryloyloxyethyl)acid phosphate, (2-(meth)acryloyloxypropyl)acid phosphate, and other phosphate group-containing (meth)acrylates; N,N-dialkylaminoalkyl (meth)acrylates such as N,N-diethylaminoethyl (meth)acrylate; (meth)acrylamide; (meth)acrylic acid, β-carboxyethyl (meth)acrylate, and other carboxyl group-containing (meth)acryloyl monomers; acetoacetoxyethyl Carbonyl group-containing (meth)acryloyl monomers such as (meth)acrylate and diacetone (meth)acrylamide; epoxy group-containing (meth)acryloyl monomers such as glycidyl (meth)acrylate, β-methylglycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, 3,4-epoxycyclohexylethyl (meth)acrylate, and 3,4-epoxycyclohexylpropyl (meth)acrylate; isocyanato group-containing (meth)acryloyl monomers such as isocyanatoethyl (meth)acrylate;Alkoxysilyl group-containing (meth)acryloyl monomers such as γ-(meth)acryloyloxypropyltrimethoxysilane and γ-(meth)acryloyloxypropyltriethoxysilane; oxidatively curable group-containing (meth)acryloyl monomers such as dicyclopentenyloxyethyl (meth)acrylate, dicyclopentenyloxypropyl (meth)acrylate, and dicyclopentenyl (meth)acrylate; heterocyclic group-containing (meth)acryloyl monomers such as 1,2,2,6,6-pentamethylpiperidyl (meth)acrylate and 2,2,6,6-tetramethylpiperidinyl (meth)acrylate; 2-((meth)acryloyloxy)ethyltriethoxysilane; Examples of the quaternary ammonium base-containing (meth)acrylates include methylammonium chloride, 2-((meth)acryloyloxy)ethyltrimethylammonium bromide, (meth)acryloylaminopropyltrimethylammonium chloride, (meth)acryloylaminopropyltrimethylammonium bromide, tetrabutylammonium (meth)acrylate, tetramethylammonium (meth)acrylate, trimethylbenzylammonium (meth)acrylate, and 2-((meth)acryloyloxy)ethyltrimethylammonium dimethyl phosphate; and (meth)acrylates having a polyoxyalkylene chain.

[0040] In the present invention, "(meth)acrylic" is a concept that encompasses acrylic, methacrylic, or both acrylic and methacrylic, "(meth)acryloyl" is a concept that encompasses acryloyl, methacryloyl, or both acryloyl and methacryloyl, and "(meth)acrylate" is a concept that encompasses acrylate, methacrylate, or both acrylate and methacrylate.

[0041] Examples of the other polymerizable unsaturated monomers include cyano group-containing compounds such as acrylonitrile and methacrylonitrile; vinyl ester compounds such as vinyl acetate and vinyl propionate; vinyl aromatic compounds such as styrene and α-methylstyrene; carboxyl group-containing polymerizable unsaturated monomers such as maleic acid, itaconic acid, and crotonic acid; carbonyl group-containing polymerizable unsaturated monomers such as acrolein, methacrolein, formylstyrene, vinyl alkyl ketones having 4 to 7 carbon atoms (for example, vinyl methyl ketone, vinyl ethyl ketone, and vinyl butyl ketone), and acetoacetoxy allyl esters; Examples of the polymerizable unsaturated monomers include epoxy group-containing polymerizable unsaturated monomers such as diglycidyl ether; isocyanato group-containing polymerizable unsaturated monomers such as mi-propenyl-α,α-dimethylbenzyl isocyanate; alkoxysilyl group-containing polymerizable unsaturated monomers such as vinyltrimethoxysilane and vinyltriethoxysilane; oxidatively curable group-containing polymerizable unsaturated monomers such as reaction products of epoxy group-containing polymerizable unsaturated monomers or hydroxyl group-containing polymerizable unsaturated monomers with unsaturated fatty acids; and fluorovinyl ethers such as fluoroalkyltrifluorovinyl ether and perfluoroalkyltrifluorovinyl ether.

[0042] When the (meth)acrylic resin is a copolymer of a (meth)acryloyl compound and another polymerizable unsaturated monomer, the content of structural units derived from the (meth)acryloyl compound relative to 100% by mass of all structural units in the (meth)acrylic resin is preferably 20 to 99.9% by mass, and more preferably 40 to 99.5% by mass.

[0043] Urethane resin emulsion Examples of the urethane resin emulsion include conventional emulsions synthesized by known methods, for example, emulsion polymerization methods using an anionic or nonionic emulsifier.

[0044] Examples of the urethane-based resin include reaction products obtained using one or more types of polyisocyanates and one or more types of polyols, and examples of the polyol include various urethane resins using polyether-based, polycarbonate-based, polyester-based, etc.

[0045] The urethane resin may be a modified urethane resin. Examples of modified urethane resins include (meth)acrylic-modified urethane resins, polycarbonate-modified urethane resins, ester-modified urethane resins, ether-modified urethane resins, and epoxy-modified urethane resins.

[0046] The emulsion may be one produced by a conventionally known method, or a commercially available product.

[0047] Commercially available acrylic resin emulsions include, for example, the "Boncoat Series" [e.g., AC-501, S-5, SS-5, AC-501, H-5, AB-901, W-26, W-386] (manufactured by DIC Corporation); the "Acryset Series" [e.g., EF-002, EF-005, EF-006, EF-007, EF-008, EF-009, EMN-325E, 210E, 110E, 202 E, 250E] (manufactured by Nippon Shokubai Co., Ltd.); "Polysol Series" [e.g., AT860, AT115, AM610, AM961, AP1761, AP4690N] (manufactured by Resonac Co., Ltd.); "Yodosol Series" [e.g., AD57, AD93, AD112, AD153, AD161, AD173, AD176, AD179, AD190, AD504, AF-8] (manufactured by Henkel Technologies Japan Pan Co., Ltd.); "Polydurex Series" [e.g., H7650, H-7000, G613, G633, G621] (Asahi Kasei Corporation); "Primal Series" [e.g., AC2235, B-15, AC507, AC3444, RP-29] (Rohm and Haas Japan Co., Ltd.); "Acronal Series" [e.g., 296D, 4110, 4220, 4130, 4415, 46 70, YJ-2730, YJ-2733] (manufactured by BASF Japan Ltd.); "Movinyl series" [e.g., 743N, 6520, DM774, ES-85, ES-90, 4060, 4061, 760H, 761HG, 987B, FK-900] (manufactured by Japan Coating Resin Co., Ltd.); "Zemlac series" [e.g., W3108F, W3153CF] (manufactured by Kaneka Corporation).

[0048] Commercially available urethane resin emulsions include, for example, "Sancure 20025F" ​​and "Turboset 2027" (both manufactured by Lubrizol); "ADEKA BONTITOR series" [e.g., HUX-232, HUX-320, HUX-350, HUX-380, HUX-401, HUX-522, HUX-540] (manufactured by ADEKA Corporation); "SUPERFLEX series" [e.g., 420, 460, 470, 500, 550, 610, 650, 860, E-4000, E-4800] (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.); and "HYDRAN Examples of such products include the "NEOREZ series" [e.g., HW-311, HW-350, HW-150, WLS-201, WLS-202, WLS-210, and WLS-213] (manufactured by DIC Corporation); the "NEOREZ series" [e.g., R-972, R-967, R-600, and R-9603] (manufactured by Kusumoto Chemicals Co., Ltd.); "UW-1005E" and "UW-5502" (both manufactured by UBE Corporation); "Permarine UA-368" (manufactured by Sanyo Chemical Industries, Ltd.); and "TURBOSET 2025" (manufactured by GSI Creos Corporation).

[0049] <Ingredient (b)> The component (b) is not particularly limited as long as it is an anionic or nonionic organic antiviral agent, and any conventionally known antiviral agent can be used. The composition uses an organic antiviral agent, rather than an inorganic one, together with components (a) and (c), and therefore can easily form a coating that has a high 60-degree gloss value, excellent transparency, and is resistant to discoloration (excellent light resistance). The component (b) used in the present composition may be one type or two or more types.

[0050] For convenience, component (b) is defined as an antiviral agent, but component (b) may also be an anionic or nonionic antibacterial agent. Therefore, according to the present invention, a coating film with excellent antibacterial properties can also be formed. The bacteria that can be the target of the antibacterial activity are not particularly limited, and include various bacteria regardless of their nature, such as gram-positive, gram-negative, aerobic, anaerobic, etc. Examples of such bacteria include Escherichia coli, Staphylococcus aureus, Staphylococcus epidermidis, streptococci, Streptococcus pneumoniae, Haemophilus influenzae, Bordetella pertussis, Salmonella enteritidis, Klebsiella pneumoniae, Pseudomonas aeruginosa, Vibrio, Salmonella enterica, Vibrio cholerae, Shigella, Bacillus anthrax, Mycobacterium tuberculosis, Clostridium botulinum, Clostridium tetani, and streptococci.

[0051] Component (b) is not particularly limited, and examples thereof include conventionally known anionic or nonionic organic antiviral agents. Examples of the organic antiviral agent include quaternary ammonium salts, pyrithione compounds, sulfonic acid group-containing polymers, amino group-containing polyvinyl alcohols, organic nitrogen-bromine compounds, compounds containing a carboxy group or a salt thereof, the antiviral composition described in JP 2018-193337 A, and other antiviral components.

[0052] Among these, in terms of better exerting the effects of the present invention, component (b) is preferably a nonionic or anionic organic antiviral agent (excluding sulfonic acid surfactants), and more preferably a compound (b1) containing a carboxyl group or a salt thereof.

[0053] The compound (b1) preferably has a carboxyl group (—COOH) or a salt thereof in the molecule and has a crosslinked structure. The salt of the carboxyl group is not particularly limited, and examples thereof include sodium salt, calcium salt, ammonium salt, magnesium salt, and barium salt. The compound (b1) exhibits antiviral effects due to the structural portion containing a carboxyl group or a salt thereof, and is particularly excellent in antiviral properties against enveloped viruses.

[0054] Examples of the compound (b1) include compounds containing a structure derived from a carboxyl group (derivative)-containing monomer having a carboxyl group or a salt thereof. The compound (b1) may be a homopolymer of a carboxyl group (derivative)-containing monomer, or a copolymer of a carboxyl group (derivative)-containing monomer and another monomer copolymerizable therewith.

[0055] The carboxyl group (derivative)-containing monomer is not particularly limited, and examples thereof include (meth)acrylic acid, β-carboxyethyl (meth)acrylate, 5-carboxypentyl (meth)acrylate, succinic acid mono(meth)acryloyloxyethyl ester, ω-carboxypolycaprolactone mono(meth)acrylate, crotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, carboxybetaine-type monomers, and salts thereof, with (meth)acrylic acid and sodium (meth)acrylate being preferred. The carboxyl group (derivative)-containing monomer may be used alone or in combination of two or more.

[0056] The other monomer copolymerizable with the carboxyl group (derivative)-containing monomer is not particularly limited, and examples thereof include alkyl (meth)acrylate, vinyl alkyl ether, vinyl acetate, ethylene, propylene, butylene, butadiene, diisobutylene, vinyl chloride, vinylidene chloride, 2-vinylnaphthalene, styrene, acrylonitrile, (meth)acrylamide, diacetone (meth)acrylamide, vinyltoluene, and vinylpyridine. The other monomers may be used alone or in combination of two or more.

[0057] The content of the structure derived from a carboxyl group (derivative)-containing monomer in the compound (b1) is preferably 80% by mass or more, more preferably 85% by mass or more, even more preferably 90% by mass or more, and is preferably 99% by mass or less, more preferably 97% by mass or less, even more preferably 95% by mass or less, from the viewpoints of achieving better antiviral properties and improving the dispersibility of the compound (b1) in the composition.

[0058] The total content of carboxyl groups and salts thereof in the compound (b1) is preferably 5 mmol / g or more, more preferably 7 mmol / g or more, even more preferably 9 mmol / g or more, particularly preferably 11 mmol / g or more, and is preferably 20 mmol / g or less, more preferably 18 mmol / g or less, even more preferably 17 mmol / g or less, particularly preferably 16 mmol / g or less, from the viewpoints of achieving better antiviral properties and improving the dispersibility of compound (b1) in the composition. The total content of carboxyl groups and salts thereof can be calculated by titrating with an aqueous sodium hydroxide solution at 25°C and calculating the amount of aqueous sodium hydroxide solution consumed up to the half-equivalent point (the point at which half the amount required for complete neutralization has been added dropwise).

[0059] The compound (b1) can be synthesized by a general-purpose polymerization method, for example, by (co)polymerizing a monomer component containing a carboxyl group (derivative)-containing monomer in the presence of a general-purpose radical polymerization initiator. Compound (b1) having a crosslinked structure can be prepared, for example, by mixing compound (b1) with one or more known organic peroxides and heating the mixture to a temperature equal to or higher than the decomposition temperature of the organic peroxide to crosslink compound (b1). In this case, one or more known crosslinking aids may be used.

[0060] The compound (b1) preferably does not contain an aromatic ring in the molecule, and is preferably an aliphatic compound, in order to have better antiviral properties.

[0061] The pH of the compound (b1) is preferably 5.5 or less, more preferably 5.0 or less, and the lower limit is, for example, 2.0, in order to obtain better antiviral properties, particularly better antiviral properties against non-enveloped viruses. The pH of compound (b1) refers to the pH value at 25° C. of a mixture obtained by adding 0.5 g of compound (b1) to 99.5 g of purified water and mixing them uniformly. The mixture may be one in which the entire amount of compound (b1) is dissolved in purified water, or one in which compound (b1) is dissolved in purified water to form a saturated aqueous solution.

[0062] The weight average molecular weight of the compound (b1) is preferably 100 or more, more preferably 200 or more, and particularly preferably 300 or more, from the viewpoint of achieving better antiviral properties.

[0063] The weight average molecular weight is a polystyrene-equivalent value measured by GPC (gel permeation chromatography), and can be measured, for example, using the following measuring device and under the following measuring conditions. Gel permeation chromatograph: 2690 Separations Model (Waters) Column: GPC KF-806L (Resonac Corporation) Detector: differential refractometer Sample flow rate: 1 mL / min Column temperature: 40℃ Eluent: THF

[0064] Examples of the sulfonic acid surfactant include alkylbenzene sulfonic acid compounds, alkyl diphenyl ether disulfonic acid compounds, alkyl naphthalene sulfonic acid compounds, alkyl sulfate ester compounds, polyoxyethylene alkyl sulfate ester compounds, and naphthalene sulfonic acid formalin condensate compounds.

[0065] The content of component (b) is preferably 0.1 to 39.8% by mass, more preferably 1 to 30% by mass, and particularly preferably 2 to 10% by mass, relative to 100% by mass of the solid content of the composition, from the viewpoint of easily forming a coating that has an excellent balance of antiviral properties, adhesion to the substrate, and transparency.

[0066] As component (b) used as a raw material for the present composition [component (b) used when preparing the present composition], an aqueous solution or aqueous dispersion (including emulsion and dispersion) of the antiviral agent is preferred, because the present composition, which is an aqueous paint composition, can be easily prepared and a coating having the desired physical properties can be easily formed. The content of the antiviral agent in the aqueous solution or aqueous dispersion is preferably 5% by mass or more and preferably 80% by mass or less. The aqueous solution or aqueous dispersion is a solution or dispersion in which the antiviral agent is dissolved or dispersed in an aqueous medium. The water content and specific examples of the medium other than water in the aqueous solution or aqueous dispersion are as described in the section for component (a).

[0067] As the aqueous solution or aqueous dispersion, an anionic or nonionic organic antiviral agent may be dissolved or dispersed in an aqueous medium by a known method, or a commercially available product may be used. Examples of commercially available products include those manufactured by Daiwa Chemical Industry Co., Ltd. and Sekisui Material Solutions Co., Ltd.

[0068] <Ingredient (c)> The component (c) is not particularly limited, and any conventionally known nonionic dispersant can be used. However, in order to more effectively demonstrate the effects of the present invention, it is preferable that the component (c) be an ether-type dispersant (a dispersant having an ether structure in the molecule). Here, the term "dispersant" refers to, for example, a compound having a structure in which a hydrophilic moiety and a lipophilic moiety are covalently bonded within one molecule. The component (c) used in the present composition may be one type or two or more types.

[0069] Examples of the ether-type dispersants include polyoxyalkylene compounds, alkylene oxide adducts of alkylphenols, alkylene oxide adducts of alcohols, polyhydric alcohol fatty acid esters, alkylene oxide adducts of alkylamines, alkylene oxide adducts of fatty acid amides, alkylene oxide adducts of acetylene glycols, and polyoxyalkylene-modified silicones (polyether-modified silicones).

[0070] The HLB value of component (c) is preferably 2.0 or more, more preferably 4.0 or more, from the viewpoints that a composition having excellent paint appearance can be easily obtained, and a coating having a high 60-degree gloss value, excellent transparency, and resistance to discoloration (excellent light resistance) can be easily formed, and the upper limit is not particularly limited, but is preferably 12.0 or less, and even more preferably 6.0 or less.

[0071] Here, the HLB value stands for Hydrophile-Lipophile Balance, and is a value that indicates the degree of hydrophilicity or lipophilicity of a compound. The smaller the HLB value, the higher the lipophilicity, and the larger the value, the higher the hydrophilicity. The HLB value of the component (c) used in the following examples is a catalog value, and in this specification, the catalog value can be used as the HLB value. The HLB value can be determined, for example, by the Griffin method, specifically, by the following formula: HLB value = 20 × total formula weight of hydrophilic group moieties / molecular weight of component (c)

[0072] The content of component (c) is preferably 0.2 to 25 mass%, more preferably 0.3 to 22 mass%, and particularly preferably 0.4 to 20 mass%, relative to 100 mass% of the solid content of the composition, from the viewpoints of being able to easily form a coating that has a high 60-degree gloss value, excellent transparency, and resistance to discoloration (excellent light resistance), etc.

[0073] Component (c) used as a raw material for the present composition [component (c) used when preparing the present composition] is not particularly limited, and may be an emulsion, but is preferably in the form of a powder or dispersion. The solid content in the dispersion is preferably 20% by mass or more and preferably 80% by mass or less, from the viewpoint of the stability of the dispersion. The dispersion is a dispersion in which the dispersant is dispersed in an aqueous medium. The water content in the aqueous medium and specific examples of the medium other than water are as described in the section for component (a).

[0074] As component (c), a synthetic dispersant produced by a conventionally known method may be used, or a commercially available product such as that manufactured by San Nopco Ltd. may be used.

[0075] <Other ingredients> The present composition may contain components other than the above-mentioned components (a) to (c) as needed. As the other components, conventionally known additives that have been commonly used in the field of the present invention, etc., can be used within a range that does not impair the effects of the present invention, and examples thereof include waxes, film-forming aids, leveling agents (surface conditioners), water, organic solvents, antifoaming agents, discoloration inhibitors, insect repellents, pH adjusters, thickeners, polymerization inhibitors, matting agents, anti-settling agents, heat stabilizers, ultraviolet absorbers, pigments, and dyes. The other components may each be used alone or in combination of two or more.

[0076] Furthermore, the present composition preferably does not contain an alkali-soluble resin. Such a composition that does not contain an alkali-soluble resin is a coating composition, and is different from resin waxes such as floor waxes and floor polishes, which usually contain an alkali-soluble resin.

[0077] As the other component, for example, an inorganic powder may be used for the purpose of improving the hardness of the surface of the coating film to be formed. As the inorganic powder, silica sol such as colloidal silica is usually used. In the present composition, an inorganic powder may be used as the other component, but the present composition does not necessarily need to use an inorganic powder. When the present composition contains an inorganic powder, the content of the inorganic powder is preferably 0.1 to 5 parts by mass, more preferably 0.5 to 3 parts by mass, per 100 parts by mass of the solid content of the resin (a).

[0078] <Wax> The wax is not particularly limited, and any conventionally known wax can be used. Synthetic waxes and natural (e.g., plant-based, animal-based, mineral-based) waxes may be used, but synthetic waxes are preferred, and hydrocarbon waxes are more preferred. Here, "wax" refers to a material that is solid or semi-solid at room temperature, melts in the temperature range from room temperature to around 150°C, and has a low melt viscosity.

[0079] Examples of the synthetic wax include petroleum waxes such as paraffin wax and microcrystalline wax, and synthetic hydrocarbon waxes such as Fischer-Tropsch wax, polyethylene wax, polyethylene oxide wax, polypropylene wax, and polypropylene oxide wax. These waxes generally have 20 or more carbon atoms.

[0080] The synthetic wax preferably contains at least one selected from paraffin wax, polyethylene wax, and oxides thereof, from the viewpoint of being able to easily form a coating having superior scratch resistance, and more preferably contains at least one selected from oxidized paraffin wax and oxidized polyethylene wax, and even more preferably contains oxidized paraffin wax, from the viewpoint of the scratch resistance of the resulting coating and the dispersibility of the wax in the composition.

[0081] The average particle size of the wax depends on the thickness of the coating film formed depending on the application of the composition, but is preferably 1 to 30 μm, more preferably 2 to 20 μm, and particularly preferably 3 to 15 μm, from the viewpoint of easily forming a coating film with superior scratch resistance. The average particle size of the wax used as a raw material in preparing the present composition may be within the above range.

[0082] The shape of the wax is not particularly limited as long as the average particle diameter is within the above range. The wax is generally spherical, and preferably a true sphere, but the sphericity and other properties are not particularly limited.

[0083] The content of the wax is preferably 0.5 to 10% by mass, more preferably 1 to 7.5% by mass, relative to 100% by mass of the composition, from the viewpoint of easily forming a coating that has a good balance of scratch resistance, adhesion to the substrate, antibacterial properties, and antiviral properties.

[0084] The wax used as a raw material for the present composition (the wax used in preparing the present composition) is not particularly limited, but is preferably an emulsion. The emulsion is a dispersion in which the wax is dispersed in an aqueous medium. The water content in the aqueous medium and specific examples of the medium other than water are as described in the section for component (a).

[0085] As the wax, synthetic wax produced by a conventionally known method or a commercially available product may be used.

[0086] [Film-forming agent] Since the present composition contains water, the composition may freeze in winter, and from the viewpoint of improving film-forming properties at low temperatures and the finished appearance of the formed film, it is preferable to include a film-forming aid.

[0087] The film-forming aid may be one that is commonly used in aqueous coating compositions, and examples thereof include linear or branched aliphatic alcohols having 5 to 10 carbon atoms; alcohols having an aromatic ring; monoethers such as (poly)ethylene glycol or (poly)propylene glycol; (poly)ethylene glycol ether esters; and (poly)propylene glycol ether esters.

[0088] When the present composition contains a film-forming aid, the content of the film-forming aid is preferably 0.1 to 10 mass %, more preferably 0.2 to 5 mass %, relative to 100 mass % of the present composition, from the viewpoint of being able to easily form a coating that has excellent film-forming properties at low temperatures and excellent appearance.

[0089] As the film-forming aid, a film-forming aid produced by a conventionally known method may be used, or a conventionally known commercially available product may be used.

[0090] [Leveling agent] The present composition preferably contains a leveling agent, which improves repelling of the coating when the composition is applied, improves wettability to the substrate surface, and makes it easy to form a coating with a uniform thickness. The leveling agent is not particularly limited, but examples thereof include various leveling agents (surface conditioners) such as fluorine-based, acrylic-based, and silicone-based leveling agents. As the surface conditioner, a surface conditioner produced by a conventionally known method may be used, or a conventionally known commercially available product may be used.

[0091] When the present composition contains a leveling agent, the content of the leveling agent is preferably 0.005 to 2.0 mass %, more preferably 0.01 to 1.5 mass %, relative to 100 mass % of the solid content of the present composition.

[0092] [Antifoaming agent] The present composition preferably contains an antifoaming agent, since this can suppress the generation of bubbles during the production or application of the composition, or can break any bubbles that have generated in the present composition, thereby making it possible to easily form a coating having desired physical properties.

[0093] The antifoaming agent is not particularly limited, and examples thereof include acrylic-based (excluding component (a)), vinyl ether-based, silicone-based, butadiene-based, olefin-based and fluorine-based compounds. As the defoaming agent, a defoaming agent produced by a conventionally known method may be used, or a conventionally known commercially available product may be used.

[0094] When the present composition contains an antifoaming agent, the content of the solid content of the antifoaming agent is preferably 0.05 to 2.0 mass% relative to 100 mass% of the solid content of the present composition, from the viewpoints that foam generation can be sufficiently suppressed and a coating having desired physical properties can be easily formed.

[0095] [water] It is preferable to use an aqueous dispersion or an aqueous solution as the raw materials for the components (a) and (b). When such raw materials are used, the resulting composition contains water. However, it is preferable to further blend water in addition to the water that may be contained in the raw materials such as the components (a) and (b) in order to make it easier to prepare the composition and to easily obtain a composition that is superior in storage stability and coating workability. The water is not particularly limited, and tap water or the like may be used, but it is preferable to use pure water. The amount of water used is preferably such that the content of water in the composition falls within the above range.

[0096] <Present composition> The present composition can be prepared by mixing the above-mentioned components by known means.

[0097] The present composition can be suitably used as an aqueous aftercoat paint. Furthermore, by periodically maintaining a substrate using the composition as an aqueous aftercoat paint, the above-mentioned effects can be constantly imparted to the substrate. Furthermore, the present composition can be suitably used as a coating material for on-site painting of residential spaces and the like, since it can more effectively exhibit the effects of the present invention.

[0098] The use of the composition is not particularly limited, but it can be suitably used in homes and other places where an unspecified number of people come and go. Since the present composition is a water-based coating composition, it can be easily and safely applied to a substrate (object to be coated) using a brush or the like, and there are no particular limitations on the substrate as long as it adheres to the substrate. Specifically, the composition can be used in a variety of products and equipment used in homes, public facilities (including medical facilities such as hospitals, elderly care facilities, early childhood facilities such as kindergartens, educational facilities such as schools, parks, government offices, stations, airports, etc.), public transportation, office buildings, department stores, entertainment facilities, various manufacturing facilities for pharmaceuticals and food, restaurants, livestock facilities, etc. Specific examples include interior materials such as flooring (including PVC sheet flooring, etc.), fixtures, wall materials, and ceiling materials; aluminum sashes, screen doors, and veranda fences; outdoor products (including tent fabrics, metal members, plastic members, etc.); various tiles; various buttons such as doorknobs, door handles, levers, water faucets, handrails, straps, elevator buttons, and light buttons; toilet components such as toilet bowls and toilet paper holders; bathroom components such as bathtubs and bathroom surfaces; kitchen and washroom components; and materials that come into contact with hands, such as benches, chairs, and playground equipment.

[0099] ≪Coating, base material with coating≫ The coating according to the present invention is a film formed from the present composition, and specifically, can be produced by including a step of drying the present composition (drying step). The coating is usually formed on a substrate, i.e., a coated substrate comprising the substrate and the coating. Specifically, the coated substrate can be produced by a coating step of coating the composition on at least a portion of the substrate and a drying step of drying the coated composition. In addition to the above steps, known steps may be carried out as necessary when producing the coated substrate.

[0100] The (dry) film thickness of the coating is not particularly limited as long as it is thick enough to exhibit the desired function, but is usually 1 to 20 μm, preferably 3 to 10 μm, from the viewpoint of easily protecting the substrate from dirt, scratches, etc. Furthermore, when the (dry) film thickness is in this range, a coated substrate with excellent antiviral properties can be easily formed. When forming a coating having such a (dry) thickness, it is preferable to form a coating of the desired thickness in a single application.

[0101] The 60 degree gloss of the coating is preferably 100 or more, more preferably 110 or more, and even more preferably 120 or more. The 60 degree gloss can be measured by the method described in the examples below.

[0102] The haze value of the coating is preferably less than 10%, more preferably 7% or less, and even more preferably 5% or less, from the viewpoint of providing a coating with superior transparency, and the lower limit is preferably as small as possible, and may be 0%. The haze value can be measured by the method described in the examples below.

[0103] The color difference (ΔE*) of the coating before and after a light resistance test (96 hours of light irradiation) is preferably 1.5 or less, more preferably 1.0 or less, from the viewpoint of obtaining a coating that is more resistant to discoloration (excellent light resistance), and the lower limit is preferably smaller, and may be 0. The color difference can be measured by the method described in the examples below.

[0104] The substrate is not particularly limited, and may be any substrate on which the coating film is to be formed, and examples thereof include wood (wood substrates), plastic, paper, metal, glass, ceramics, concrete, brick, and pottery. Examples of the plastic include various plastic substrates (e.g., films and molded articles formed from triacetyl cellulose, polyethylene terephthalate (PET), diacetyl cellulose, acetate butyrate cellulose, polyolefin, polyvinyl chloride, polyethersulfone, polyacrylic, polyurethane, polyester, polycarbonate, polysulfone, polyether, polymethylpentene, polyether ketone, (meth)acrylonitrile, etc.).

[0105] As the substrate, a wood substrate is preferred, and wood flooring is more preferred, in terms of enabling the effects of the present invention to be more effectively exhibited. The wood substrate may be a veneer-covered, paper-covered or sheet-covered substrate, or may be solid wood. Furthermore, the substrate may be a substrate whose surface has been previously subjected to a conventionally known sealing treatment, coloring treatment, or the like, as required, or a substrate coated with a conventionally known undercoat paint, intermediate paint, topcoat paint, or the like. The undercoat paint, intermediate coat paint and top coat paint may be conventionally known paints, and may be applied by any means generally used for applying paints.

[0106] The coating method in the coating step may be appropriately selected depending on the composition of the present composition used, the type of substrate, and the like, and examples thereof include brush coating, trowel brush coating, roll coating, spray coating, dip coating, air knife coating, curtain coating, wire bar coating, gravure coating, and extrusion coating.

[0107] The amount of the composition to be applied to the substrate is not particularly limited, but it is preferable to apply the composition so that the thickness of the resulting coating falls within the above range, from the viewpoint of easily protecting the substrate from dirt, scratches, etc., and specifically, from 10 to 30 g / m 2 is preferred. When the amount of the composition applied is within this range, a coated substrate having excellent antiviral properties can be easily obtained.

[0108] The drying step may be carried out at room temperature (for example, 5 to 30°C), or may be carried out under heating at about 5 to 50°C in order to shorten the drying time. [Example]

[0109] The present invention will be specifically described below based on examples, but the present invention is not limited to the following examples.

[0110] [Example 1] An aqueous coating composition was prepared by thoroughly stirring 60 parts by mass of resin a-1, 4 parts by mass of antiviral agent b-1, 0.5 parts by mass of dispersant c-1, 2 parts by mass of aqueous wax, 0.3 parts by mass of film-forming aid, 0.2 parts by mass of leveling agent, 0.1 parts by mass of antifoaming agent, and 32.9 parts by mass of diluent. The blending amount of resin a-1 (60 parts by mass) in Table 1 means the blending amount of the emulsion. The same applies to the following examples and comparative examples.

[0111] [Examples 2 to 14 and Comparative Examples 1 to 10] A water-based coating composition was prepared in the same manner as in Example 1, except that the components shown in Table 1 or 2 were used in the amounts (parts by mass) shown in Table 1 or 2 instead of the raw materials used in Example 1. The details of each component in Tables 1 and 2 are as shown in Table 3.

[0112] <Paint appearance> The prepared water-based coating compositions were allowed to stand at room temperature for 30 minutes, after which the appearance of the compositions was visually observed and evaluated according to the following criteria. The results are shown in Tables 1 and 2.

[0113] (Evaluation criteria) ○: No gel or precipitate. △: A small amount of gel or precipitate is present. ×: Gel or precipitate is present.

[0114] <Appearance of coated base material> The water-based coating composition prepared in Example 1 or Comparative Example 3 was applied to a commercially available wooden floor material (substrate) using a brush at an application rate of 20.0 g / m 2 The coating was applied so that the coating amount was such that the coating amount was 100% and the coating amount was 100%. The coating was then dried at room temperature (approximately 10 to 20°C) for 16 hours or more to produce a coated substrate. The left side of Figure 1 is a photograph of the coated substrate when the aqueous coating composition prepared in Example 1 was used, and the right side of Figure 1 is a photograph of the coated substrate when the aqueous coating composition prepared in Comparative Example 3 was used. The 60-degree gloss of a commercially available wooden flooring material (substrate) was 30, the 60-degree gloss of the coating on the coated substrate when the water-based paint composition prepared in Example 1 was used was 65, and the 60-degree gloss of the coating on the coated substrate when the water-based paint composition prepared in Comparative Example 3 was used was 22. The 60-degree gloss was measured using a gloss meter (GM-26PRO, manufactured by Murakami Color Research Laboratory Co., Ltd.).

[0115] <Paint pH> The pH of the prepared water-based coating compositions at 23° C. was measured using LAQUA twin (manufactured by Horiba, Ltd.) The results are shown in Tables 1 and 2.

[0116] <60 degree gloss> -Creating test specimens The prepared water-based coating composition was applied to a glass plate (substrate) using a 2-mil film applicator and dried at room temperature (about 10 to 20°C) for 16 hours or more to prepare a test piece (coated substrate). The following measurements were carried out using the obtained test piece.

[0117] Testing Method The 60-degree gloss of the coating was measured using a gloss meter (GM-26PRO, manufactured by Murakami Color Research Laboratory Co., Ltd.) The results are shown in Tables 1 and 2.

[0118] <Haze value> -Creating test specimens The prepared water-based coating composition was applied to a PET film (manufactured by Toyobo Co., Ltd., trade name: Cosmoshine A4360, thickness 100 μm, substrate) using a bar coater at a coating amount of 20.0 g / m 2The coating was applied so that the coating composition was as follows: and the coating composition was dried at room temperature (about 10 to 20° C.) for 16 hours or more to prepare a test piece (coated substrate). The following measurements were carried out using the test piece obtained.

[0119] Testing Method The haze value of the coating was measured using a haze meter (NDH4000, manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K 7136:2000. The results are shown in Tables 1 and 2.

[0120] <Fade test> -Creating test specimens The prepared water-based coating composition was applied to a commercially available wooden floor material (15 cm long x 7.5 cm wide, base material) using a brush at a coating rate of 20.0 g / m 2 The coating was applied so that the coating amount was 1000 ppm, and the coating was dried at room temperature (about 10 to 20° C.) for 16 hours or more to prepare a test piece (coated substrate). The following tests were carried out using the obtained test piece.

[0121] Testing Method A lightfastness test was performed using a fading tester (Suga Test Instruments Co., Ltd., Model H40-2) by irradiating the coating with light from a fading mercury lamp containing ultraviolet light for 96 hours. In accordance with JIS Z 8722:2000, the hue of the coating before and after the lightfastness test was measured using a color difference meter (JP7100F, Color Techno System Co., Ltd.), and the color difference (ΔE*) was calculated. The results are shown in Tables 1 and 2.

[0122] <Antiviral> -Creating test specimens The prepared water-based coating composition was applied to a commercially available wooden floor material (15 cm long x 7.5 cm wide, base material) using a brush at a coating rate of 20.0 g / m 2 The coating was applied so that the coating amount was 1000 ppm, and the coating was dried at room temperature (about 10 to 20° C.) for 16 hours or more to prepare a test piece (coated substrate). The following tests were carried out using the obtained test piece.

[0123] Testing Method The antiviral properties of the coating on the obtained test specimens were evaluated in accordance with ISO 21702, specifically by the following method. The following host cells were infected with the virus and cultured to prepare virus suspensions of the specified concentrations. A 5 cm square test specimen was placed in a petri dish with the coating side facing up, and 0.4 mL of the virus suspension was inoculated onto the coating surface of the test specimen. The resulting test specimen was covered with a 4 cm square polyethylene film and gently pressed to ensure that the virus suspension was distributed throughout the polyethylene film. The specimen was then stored in a temperature- and humidity-controlled chamber at 25°C for 24 hours. After 24 hours, a washout solution (10 mL of SCDLP medium supplemented with fetal bovine serum to a final concentration of 10%) was added to the petri dish to wash out the virus adhering to the test specimen coating. The washed solution was serially diluted with the dilution medium described below to obtain virus solutions.

[0124] (influenza virus) Virus strain: Influenza A virus (H3N2, A / Hong Kong / 8 / 68; TC adapted ATCC VR-1679) Host cells: MDCK cells (canine kidney-derived cells) Dilution medium: EMEM

[0125] (Feline calicivirus [a surrogate for norovirus]) Virus strain: Feline calicivirus; Strain: F-9 ATCC VR-782 Host cells: CRFK cells (cat kidney-derived cells) Dilution medium: DMEM

[0126] Epithelial cells were infected with each of the serially diluted virus solutions, and the virus infectivity titer was measured by plaque assay. A control test was conducted in the same manner, except that a 5 cm square polyethylene film was used instead of the test piece, and the virus infectivity was measured. The antiviral activity value was calculated based on the following formula and evaluated based on the following evaluation criteria. The results are shown in Table 1 or 2. Antiviral activity value = virus infectivity in the control test - virus infectivity in the test using the test strip

[0127] (Evaluation criteria) ○: Antiviral activity value is 2.0 or higher ○△: Antiviral activity value is 0.5 or more and less than 2.0 △: Antiviral activity value is 0.1 or more and less than 0.5 ×: Antiviral activity value is less than 0.1

[0128] [Table 1]

[0129] [Table 2]

[0130] [Table 3]

Claims

1. An anionic or nonionic resin (a); an anionic or nonionic organic antiviral agent (b); a nonionic dispersant (c); Contains A water-based coating composition having a pH of 6.8 to 11.

0.

2. 2. The water-based coating composition according to claim 1, wherein the nonionic dispersant (c) is an ether-type dispersant.

3. 2. The aqueous coating composition according to claim 1, wherein the HLB value of the nonionic dispersant (c) is 5.0 to 12.

0.

4. A coating formed from the water-based coating composition according to any one of claims 1 to 3.

5. 5. The coating of claim 4, wherein the coating has a 60 degree gloss of 100 or greater.

6. 5. The coating of claim 4, wherein the coating has a haze value of less than 10%.

7. A coated substrate comprising a substrate and the coating according to claim 4.

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