Aqueous filler composition

Abstract

To provide an aqueous filler composition which forms a ground coat that has less concealment unevenness even when using a wool roller, does not exert adverse effects on finishing property of a subsequent top coat, and has cracking resistance.SOLUTION: An aqueous filler composition for forming a ground coat using a wool roller prior to coating a top coat contains a first aqueous resin (A), a second aqueous resin (B), a pigment (C), a urethane associated thickener (D), and water. A pigment volume concentration is within a range of 30 to 65%, the first aqueous resin (A) has a glass transition temperature of 30°C or lower, the second aqueous resin (B) is resin particles having an internal crosslinked structure of a solid content acid value of 100 mgKOH / g or more, and based on 100 pts.mass of the solid content of the first aqueous resin (A), a content of the second aqueous resin (B) is 0.1 to 2.5 pts.mass in solid content, and a content of the urethane associated thickener (D) is 0.1 to 2.5 pts.mass in active ingredient.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an aqueous filler coating composition for surface preparation. [Background technology]

[0002] Conventionally, in the painting of exterior walls of buildings, a base preparation is carried out before the top coat is applied to provide weather resistance and aesthetic appeal. Materials used for base preparation include synthetic resin emulsion base preparation materials, which are generally called water-based fillers in the field of architectural paints.

[0003] Since the exterior walls of buildings can expand and contract due to temperature changes, and cracks can occur over the long term, thermoplastic synthetic resin emulsions are used in base preparation materials to give them elasticity that allows them to conform to the base.

[0004] In Patent Documents 1 and 2, the applicant proposed an aqueous paint composition containing an aqueous copolymer dispersion and a pigment as an aqueous filler, characterized in that the aqueous copolymer dispersion contains an acrylate containing a linear or branched alkyl group and a carbonyl group-containing polymerizable unsaturated monomer as copolymerization components, the copolymerization ratio of the acrylate containing a linear or branched alkyl group being 50 mass% or more, and the pigment volume concentration in the composition being within the range of 15 to 60%.

[0005] Patent Document 3 also discloses a primer paint containing an aqueous resin and a pigment for forming a primer film that contacts the underside of a water-based top coat film, wherein the pigment comprises an extender pigment A having an average particle size of 1 to 30 μm and an extender pigment B having an average particle size of 73 to 300 μm, and the volume concentration of the extender pigment A relative to the total volume of the aqueous resin and the pigment is 13% or more, the volume concentration of the extender pigment B is 17% or more, and the combined volume concentration of the extender pigment A and the extender pigment B is 30 to 80%. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-277451 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-031415 [Patent Document 3] Japanese Patent Publication No. 2022-160152 Summary of the Invention [Problem to be solved by the invention]

[0007] Paint rollers are widely used for painting buildings because they cause less paint to splatter than spray paint. There are fiber-type and specialized types such as porous rollers, but the fiber-type type includes wool rollers such as high-pile rollers and woven rollers, which are often used because they are inexpensive, fast to work with, and allow for thin application. On the other hand, porous rollers are often used to apply water-based fillers, allowing for thick application and the ability to smooth out fine cracks and irregularities in the surface with a painted pattern. Porous rollers, also known as sand rollers, mastic rollers, pattern rollers, or sponge rollers, have a perforated, mesh-like structure in the roller pile. This type of roller is characterized by its ability to apply large amounts of paint at once and create ripples and other irregular patterns. However, porous rollers are more expensive than wool rollers or brushes, and require more paint per application, which can lead to storage issues at the painting site and weight issues due to the increased amount of paint applied to the surface. Furthermore, thin application and surface preparation may be required to maintain the aesthetic appeal of existing exterior walls.

[0008] In response to such demands, when aqueous fillers such as those described in Patent Documents 1 to 3 are applied using a wool roller, the paint does not adhere evenly to the wall surface, which can lead to problems such as uneven coverage, roughness on the coating surface, and poor finish of the top coat applied on top.

[0009] The present invention has been made in view of the above circumstances, and provides an aqueous filler composition that has good storage stability, good paintability even when using a wool roller, little uneven hiding, and forms a crack-resistant base coating film without adversely affecting the finish of the topcoat paint to be applied thereon. [Means for solving the problem]

[0010] The present inventors have conducted extensive research to solve the above-mentioned problems, and as a result have found that the above-mentioned problems can be solved by an aqueous filler composition comprising a first aqueous resin (A), a second aqueous resin (B), a pigment (C), a urethane associative thickener (D), and water, wherein the pigment volume concentration is in the range of 30 to 65%, the first aqueous resin (A) has a glass transition temperature of 30°C or lower, the second aqueous resin (B) is resin particles having an internal crosslinked structure and a solids acid value of 100 mgKOH / g or more, and the content of the second aqueous resin (B) is 0.1 to 2.5 parts by mass in terms of solids content, and the content of the urethane associative thickener (D) is 0.1 to 2.5 parts by mass, based on 100 parts by mass of the solids content of the first aqueous resin (A). This finding led to the completion of the present invention.

[0011] That is, the present invention includes the following embodiments. Section 1. An aqueous filler composition for forming a base coating film using a wool roller before applying a topcoat paint, a first aqueous resin (A), a second aqueous resin (B), a pigment (C), a urethane associative thickener (D), and water, the pigment volume concentration being within a range of 30 to 65%, the first aqueous resin (A) having a glass transition temperature of 30°C or lower, and the second aqueous resin (B) being resin particles having an internal crosslinked structure and having a solid content acid value of 100 mgKOH / g or higher; An aqueous filler composition, wherein the content of the second aqueous resin (B) is 0.1 to 2.5 parts by mass in terms of solid content, and the content of the urethane associative thickener (D) is 0.1 to 2.5 parts by mass in terms of active ingredient, based on 100 parts by mass of the solid content of the first aqueous resin (A). Section 2. The first aqueous resin (A) is A copolymer (A1) of polymerizable unsaturated monomers that is substantially free of both carbonyl group-containing polymerizable unsaturated monomers and alkoxysilyl group-containing polymerizable unsaturated monomers, and Copolymer (A2) of polymerizable unsaturated monomers including a carbonyl group-containing polymerizable unsaturated monomer and an alkoxysilyl group-containing polymerizable unsaturated monomer Item 1. The aqueous filler composition according to item 1. Section 3. The first aqueous resin (A) is A copolymer (A1) of polymerizable unsaturated monomers that is substantially free of both carbonyl group-containing polymerizable unsaturated monomers and alkoxysilyl group-containing polymerizable unsaturated monomers, and Copolymer (A3) of polymerizable unsaturated monomers containing a carbonyl group-containing polymerizable unsaturated monomer and substantially not containing an alkoxysilyl group-containing polymerizable unsaturated monomer Item 1. The aqueous filler composition according to item 1. Section 4. The first aqueous resin (A) is A copolymer (A3-1) of polymerizable unsaturated monomers having a glass transition temperature of less than 0°C, containing a carbonyl group-containing polymerizable unsaturated monomer and substantially not containing an alkoxysilyl group-containing polymerizable unsaturated monomer, and A copolymer of polymerizable unsaturated monomers (A3-2) having a glass transition temperature of 0°C or higher, containing a carbonyl group-containing polymerizable unsaturated monomer and substantially not containing an alkoxysilyl group-containing polymerizable unsaturated monomer. Item 1. The aqueous filler composition according to item 1. Section 5. Item 5. The aqueous filler composition according to any one of items 1 to 4, wherein the second aqueous resin (B) comprises a copolymer of a polymerizable unsaturated monomer, and the polymerizable unsaturated monomer comprises ethyl acrylate and / or ethyl methacrylate. Section 6. Item 6. The aqueous filler composition according to any one of Items 1 to 5, wherein the pigment (C) contains titanium dioxide and calcium carbonate. Section 7. Item 7. The aqueous filler composition according to any one of Items 1 to 6, wherein the brightness of a coating film formed from the aqueous filler composition is within the range of 70 to 92. Section 8. Item 8. The aqueous filler composition according to any one of Items 1 to 7, further comprising a carbon black paste (E), the carbon black paste comprising carbon black and water, and a carbon black concentration within a range of 5 to 50 mass%. Section 9. Item 8. The aqueous filler composition according to any one of Items 1 to 7, further comprising a carbon black paste (E), wherein the content of the carbon black paste (E) is in the range of 0.005 to 1% by mass based on the total amount of the aqueous filler composition. Section 10. Item 10. The aqueous filler composition according to any one of items 1 to 9, having a structural viscosity index (TI value) of 3.0 to 6.0. Section 11. A coating method comprising applying the aqueous filler composition according to any one of items 1 to 10 to a building using a wool roller, drying the composition, and then applying a topcoat paint onto the resulting base coating film. Section 12. The aqueous filler composition according to any one of items 1 to 10 is applied to a building using a wool roller in an amount of 100 to 450 g / m 2 This method involves painting the surface so that the coating is within the range of 100°C, drying it, and then painting the top coat of paint onto the formed base coat using a wool roller. [Effects of the Invention]

[0012] The aqueous filler composition of the present invention provides excellent workability in wool roller coating, suppresses uneven hiding, and produces a base coating film with excellent crack resistance. Furthermore, the composition also has a good texture, which contributes to the excellent finish of the top coating applied thereon. DETAILED DESCRIPTION OF THE INVENTION

[0013] The aqueous filler composition of this embodiment is a paint containing a first aqueous resin (A), a second aqueous resin (B), a pigment (C), a urethane associative thickener (D), and water. Each component will be described below.

[0014] First aqueous resin (A): The first aqueous resin (A) in this embodiment can be any known water-soluble or water-dispersible resin, as long as it has the ability to form a coating film. When the first aqueous resin (A) is water-dispersible, the resin portion can have a single-layer structure (homogeneous granular) or a multilayer structure such as a core-shell structure. In the case of a core-shell structure, the core and / or shell may be crosslinked. The first aqueous resin (A) can be a copolymer of a polymerizable unsaturated monomer.

[0015] In this specification, a polymerizable unsaturated monomer refers to a monomer having a polymerizable unsaturated group, and examples of the polymerizable unsaturated group include a (meth)acryloyl group, a (meth)acrylamide group, a vinyl group, a vinyl ether group, an allyl group, a propenyl group, an isopropenyl group, and a maleimide group. In this specification, "(meth)acrylate" means acrylate or methacrylate, "(meth)acrylic acid" means acrylic acid or methacrylic acid, "(meth)acryloyl" means acryloyl or methacryloyl, and "(meth)acrylamide" means acrylamide or methacrylamide.

[0016] Examples of the polymerizable unsaturated monomer include: (i) linear or branched alkyl group-containing (meth)acryloyl monomers such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, and stearyl (meth)acrylate; (ii) alicyclic alkyl group-containing (meth)acryloyl monomers such as cyclohexyl (meth)acrylate and isobornyl (meth)acrylate; (iii) aralkyl group-containing (meth)acryloyl monomers such as benzyl (meth)acrylate; (iv) alkoxyalkyl group-containing (meth)acryloyl monomers such as 2-methoxyethyl (meth)acrylate and 2-ethoxyethyl (meth)acrylate; (v) fluorine-containing (meth)acryloyl monomers such as hexafluoroisopropyl (meth)acrylate, perfluorooctylmethyl (meth)acrylate, and perfluorooctylethyl (meth)acrylate; (vi) amino group-containing (meth)acryloyl monomers such as N,N-diethylaminoethyl (meth)acrylate; (vii) (meth)acrylamide; (viii) hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate, ε-caprolactone-modified products of the above hydroxyalkyl (meth)acrylates, and hydroxyl group-containing (meth)acryloyl monomers such as polyoxyethylene chain-containing (meth)acrylates whose molecular terminals are hydroxyl groups; (ix) carboxyl group-containing (meth)acryloyl monomers such as (meth)acrylic acid and β-carboxyethyl acrylate; (x) 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; (xi) isocyanato group-containing (meth)acryloyl monomers such as isocyanatoethyl (meth)acrylate; (xii) (meth)acryloyl monomers containing an oxidation curing group, such as dicyclopentenyloxyethyl (meth)acrylate, dicyclopentenyloxypropyl (meth)acrylate, and dicyclopentenyl (meth)acrylate; (xiii) Compounds having at least two (meth)acryloyl groups in one molecule, such as allyl (meth)acrylate, ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, 1,4-butanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tetra(meth)acrylate, glycerol di(meth)acrylate, 1,1,1-trishydroxymethylethane di(meth)acrylate, 1,1,1-trishydroxymethylethane tri(meth)acrylate, and 1,1,1-trishydroxymethylpropane tri(meth)acrylate; (xiv) Aromatic vinyl compounds such as styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene, α-methylstyrene, α-methyl-p-methylstyrene, vinylethylbenzene, vinylxylene, vinylnaphthalene, and diphenylethylene; (xv) carbonyl group-containing polymerizable unsaturated monomers such as acetoacetoxyethyl (meth)acrylate, diacetone (meth)acrylamide, (meth)acrolein, formylstyrene, vinyl alkyl ketones having 4 to 7 carbon atoms (for example, vinyl methyl ketone, vinyl ethyl ketone, vinyl butyl ketone, etc.), and acetoacetoxy allyl esters; (xvi) alkoxysilyl group-containing polymerizable unsaturated monomers, such as γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropyltriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane; (xvii) (meth)acrylonitrile; (xviii) vinyl ester compounds such as vinyl acetate and vinyl propionate; (xix) allyl alcohol; (xx) Maleic acid, crotonic acid; (xxi) epoxy group-containing allyl compounds such as allyl glycidyl ether; (xxii) isocyanato group-containing polymerizable unsaturated monomers such as m-isopropenyl-α,α-dimethylbenzyl isocyanate; etc. One or more polymerizable unsaturated monomers selected from (i) to (xxii) can be used.

[0017] In this embodiment, the first aqueous resin (A) has a glass transition temperature of 30° C. or lower from the viewpoint of cracking resistance of the base coating film. The glass transition temperature is preferably within the range of −25 to 20° C. In this specification, the glass transition temperature (Tg) of a resin is calculated as follows. 1 / Tg(K)=W1 / T1+W2 / T2+ W n / T n Tg(°C)=Tg(K)-273 In the formula, W1, W2,...W n are the mass fractions of each monomer, and T1, T2, T n is the glass transition temperature Tg (K) of the homopolymer of each polymerizable unsaturated monomer. The glass transition temperature of the homopolymer of each polymerizable unsaturated monomer is a value according to pages III-139 to 179 of Polymer Handbook (Second Edition, edited by J. Brandup and EH Immergut). When the glass transition temperature of the homopolymer is unclear, the static glass transition temperature is used when the homopolymer of the monomer is synthesized so as to have a weight-average molecular weight of about 50,000. The static glass transition temperature can be determined, for example, by using a differential scanning calorimeter "DSC-50Q" (trade name, manufactured by Shimadzu Corporation) to measure the change in heat quantity in the range of -100°C to +100°C at a heating rate of 3°C / min using a sample from which volatile components have been removed by vacuum suction, and observing the first change point in the baseline on the low-temperature side.

[0018] The acid value is lower than that of the second aqueous resin (B), and is preferably 30 mgKOH / g or less.

[0019] The acid value is the number of milligrams of potassium hydroxide theoretically required to neutralize 1 g of the resin component, and is calculated from the molar amount of acidic groups contained in the constituent polymerizable unsaturated monomers and the total mass of the constituent polymerizable unsaturated monomers. Specifically, it can be calculated using the following formula: Theoretical acid value (mgKOH / g) = [Number of moles of acid groups derived from acid group-containing polymerizable unsaturated monomer (mmol)] × 56.1 / [Amount of polymerizable unsaturated monomer charged (g)] Here, "56.1" is the molecular weight of KOH, and the "charged amount of polymerizable unsaturated monomers" is the total mass of the polymerizable unsaturated monomers. If the number of moles of acid groups contained in the sample is unclear, it shall be measured by the acid value (titration method) described in JIS K 5601-2-1:1999.

[0020] The method for polymerizing the above monomers is not particularly limited, and can be carried out, for example, by (co)polymerizing the above monomers in the presence of a polymerization initiator and an emulsifier according to a general emulsion polymerization method.

[0021] The first aqueous resin (A) may be a single resin or a combination of multiple resins, provided that the glass transition temperature is 30° C. or lower.

[0022] Examples of the first aqueous resin (A) being a combination of multiple resins include: (I) An embodiment in which the first aqueous resin (A) contains a copolymer (A1) of polymerizable unsaturated monomers that does not contain either a carbonyl group-containing polymerizable unsaturated monomer or an alkoxysilyl group-containing polymerizable unsaturated monomer, and a copolymer (A2) of polymerizable unsaturated monomers that contains a carbonyl group-containing polymerizable unsaturated monomer and an alkoxysilyl group-containing polymerizable unsaturated monomer. (II) An embodiment in which the first aqueous resin (A) comprises a copolymer (A1) of polymerizable unsaturated monomers containing neither a carbonyl group-containing polymerizable unsaturated monomer nor an alkoxysilyl group-containing polymerizable unsaturated monomer, and a copolymer (A3) of polymerizable unsaturated monomers containing a carbonyl group-containing polymerizable unsaturated monomer but not an alkoxysilyl group-containing polymerizable unsaturated monomer, or (III) An embodiment in which the first aqueous resin (A) contains a copolymer (A3-1) of polymerizable unsaturated monomers having a glass transition temperature of less than 0°C and containing a carbonyl group-containing polymerizable unsaturated monomer but not containing an alkoxysilyl group-containing polymerizable unsaturated monomer, and a copolymer (A3-2) of polymerizable unsaturated monomers having a glass transition temperature of 0°C or higher and containing a carbonyl group-containing polymerizable unsaturated monomer but not containing an alkoxysilyl group-containing polymerizable unsaturated monomer. etc.

[0023] The copolymer (A1) of polymerizable unsaturated monomers containing neither a carbonyl group-containing polymerizable unsaturated monomer nor an alkoxysilyl group-containing polymerizable unsaturated monomer is a copolymer of at least one kind of polymerizable unsaturated monomer selected from the group consisting of the above polymerizable unsaturated monomers (i) to (xxii), which does not contain a carbonyl group-containing polymerizable unsaturated monomer nor an alkoxysilyl group-containing polymerizable unsaturated monomer as a monomer.

[0024] In a preferred embodiment, the copolymer (A1) of polymerizable unsaturated monomers that does not contain either a carbonyl group-containing polymerizable unsaturated monomer or an alkoxysilyl group-containing polymerizable unsaturated monomer is specifically preferably a polymer of monomers that contains the monomers (i), (viii), and (ix), and optionally contains at least one monomer selected from the group consisting of the monomers (ii), (xiii), and (xi). The content of the first aqueous resin (A) is preferably within a range of 5 to 95 parts by mass, more preferably 15 to 80 parts by mass in terms of solid content, based on 100 parts by mass of the solid content of the aqueous filler composition. In this specification, "solid content" refers to the residue after removing volatile components such as water and organic solvents, and refers to non-volatile components such as resins, hardeners, pigments, etc. For example, the "solid content" refers to the residue after weighing out 1 gram of a sample into a heat-resistant container such as an aluminum foil cup, spreading the sample on the bottom of the container, and drying at 110°C for 1 hour.

[0025] Second water-based resin (B): The second aqueous resin (B) is an aqueous resin other than the first aqueous resin (A), and is composed of resin particles having an internal crosslinked structure and an acid value of the solid content of 100 mgKOH / g or more, preferably 100 to 400 mgKOH / g. By including the aqueous resin (B), it is possible to obtain an aqueous filler composition that can form a base coating film that is easy to apply with a wool roller and has excellent hiding power on uneven surfaces, and also has good storage stability.

[0026] Examples of the second aqueous resin (B) include a copolymer of polymerizable unsaturated monomers including an acid group-containing polymerizable unsaturated monomer (b1) and a polymerizable unsaturated monomer (b2) having at least two polymerizable unsaturated groups in one molecule.

[0027] Examples of the acid group-containing polymerizable unsaturated monomer (b1) include (meth)acrylic acid, β-carboxyethyl acrylate, maleic acid, crotonic acid, and combinations thereof, and (meth)acrylic acid, particularly methacrylic acid, is preferred from the viewpoint of workability with a wool roller.

[0028] Examples of the polymerizable unsaturated monomer (b2) having at least two polymerizable unsaturated groups in one molecule include allyl (meth)acrylate, ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, 1,4-butanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexa Examples of the acrylates include diphenyl di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tetra(meth)acrylate, glycerol di(meth)acrylate, 1,1,1-trishydroxymethylethane di(meth)acrylate, 1,1,1-trishydroxymethylethane tri(meth)acrylate, 1,1,1-trishydroxymethylpropane tri(meth)acrylate, triallyl isocyanurate, diallyl terephthalate, divinylbenzene, and combinations thereof.

[0029] In the second aqueous resin (B), from the viewpoint of obtaining a base coating film with good wool roller coating workability and minimal hiding unevenness, the amount of the polymerizable unsaturated monomer (b2) used is suitably within the range of 0.1 to 5 mass %, particularly 0.3 to 3 mass %, of the total polymerizable unsaturated monomers used in the production of the second aqueous resin (B).

[0030] In addition, in the second aqueous resin (B), from the viewpoint of providing good wool roller coating workability and obtaining a base coating film with minimal hiding unevenness, the polymerizable unsaturated monomers used as raw materials for producing the second aqueous resin (B) preferably contain methyl (meth)acrylate and / or ethyl (meth)acrylate (b3). The amount of the methyl (meth)acrylate and / or ethyl (meth)acrylate (b3) used is suitably 50 to 90 mass%, particularly 55 to 85 mass%, of the total polymerizable unsaturated monomers used to produce the second aqueous resin (B).

[0031] The polymerizable unsaturated monomers used to produce the second aqueous resin (B) may optionally contain, in addition to the monomers (b1), (b2), and (b3), the compounds exemplified in the description of the polymerizable unsaturated monomers used to produce the first aqueous resin (A).

[0032] In this embodiment, the second aqueous resin (B) can be used alone or in combination with multiple resins, and its content is 0.1 to 2.5 parts by mass, preferably 0.2 to 1.0 parts by mass, in terms of solid content based on 100 parts by mass of the solid content of the first aqueous resin (A), from the viewpoints of providing good storage stability of the aqueous filler composition, good workability in wool roller coating, and obtaining a base coating film with little hiding unevenness.

[0033] Pigment (C): The aqueous filler composition of this embodiment contains a pigment (C). Examples of the pigment (C) include color pigments such as titanium white, zinc oxide, alumina, graphite, black iron oxide, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, ferric oxide (red iron oxide), molybdate orange, permanent red, permanent carmine, anthraquinone red, perylene red, quinacridone red, yellow iron oxide, titanium yellow, fast yellow, benzimidazolone yellow, chrome green, cobalt green, phthalocyanine green, ultramarine blue, Prussian blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, aluminum pigments, and pearl pigments; extender pigments such as calcium carbonate, talc, barium sulfate, mica, clay, silica, and aluminum hydroxide; and combinations thereof.

[0034] The pigment volume concentration of the aqueous filler composition of this embodiment is in the range of 30 to 65%, preferably in the range of 35 to 55%. In this specification, "pigment volume concentration" refers to the volume ratio of all pigments to the total solid content of all resins and all pigments in the paint. A pigment volume concentration of 30 to 65% results in a base coat film that is easy to apply with a wool roller, has a texture that does not affect the finish of the top coat, and has excellent crack resistance.

[0035] The specific gravity of the pigment, which is the basis for calculating the volume of the pigment, shall be the value from the catalogue, and if it is unclear, it shall be taken from the "Paint Raw Materials Handbook, 9th Edition" (Japan Paint Manufacturers Association), and the specific gravity of the resin solids shall be taken to be approximately 1. In this specification, when calculating the pigment volume concentration and when using the "resin" as the basis for the content of the urethane associative thickener (D) described below, this refers to, for example, the first aqueous resin (A), the second aqueous resin (B), aqueous resins other than the first aqueous resin (A) and the second aqueous resin (B), and film-forming components such as crosslinkers, but does not include various additives such as urethane associative thickeners, dispersants, or antifoaming agents.

[0036] The pigment (C) preferably contains titanium white and calcium carbonate, in order to enhance the brightness of a coating film formed from the aqueous filler composition. The total mass of titanium white and calcium carbonate, based on 100 parts by mass of the resin solids contained in the aqueous filler composition, is preferably 100 to 500 parts by mass, more preferably 150 to 400 parts by mass. The mass of titanium white, based on 100 parts by mass of the total mass of titanium white and calcium carbonate, is preferably 5 or more and less than 50 parts by mass, particularly preferably 10 to 20 parts by mass.

[0037] Urethane associative thickener (D): The aqueous filler composition of this embodiment contains a urethane associative thickener (D). The urethane associative thickener is a urethane resin having a hydrophobic moiety (hydrophobic group) and a hydrophilic moiety (hydrophilic group). Examples of the hydrophobic group include a hydrocarbon group, and examples of the hydrophilic group include an ether bond. The urethane associative thickener (D) is commercially available, and examples of commercially available products include the ADEKA NOL series (manufactured by ADEKA, trade name) and the SN Thickener series (manufactured by SAN NOPCO).

[0038] In this embodiment, the urethane associative thickener (D) can be used alone or in combination, and the total content is in the range of 0.1 to 2.5 parts by mass, preferably 0.2 to 1.5 parts by mass, of the active ingredient based on 100 parts by mass of the solids content of the first aqueous resin (A) contained in the aqueous filler composition, in terms of the texture of the base coating film, hiding power, ease of wool roller coating, and hiding power of the coating film to be applied thereon. Note that the active ingredient amount refers to the amount of the urethane associative thickener (D), and when the urethane associative thickener (D) is a commercially available product, it refers to the amount of the urethane associative thickener (D) excluding other components such as diluents.

[0039] In this embodiment, the urethane associative thickener (D) is preferably one having a viscosity of 3000 mPa·sec or less, particularly 100 to 1000 mPa·sec, in a 5% aqueous solution. Specifically, the viscosity of the urethane associative thickener, when diluted with deionized water to a concentration of the active ingredient of 5% by mass, is preferably 3000 mPa·sec or less, more preferably 100 to 1000 mPa·sec. The active ingredient concentration is determined based on the active ingredient concentration listed in the catalog for the urethane associative thickener. If the active ingredient concentration of the urethane associative thickener is unclear, measure the solids concentration of the urethane associative thickener and use this as the active ingredient concentration of the urethane associative thickener. The solids concentration is calculated by weighing 1 gram of sample into a heat-resistant container such as an aluminum foil cup, spreading the sample on the bottom of the container, drying at 110°C for 1 hour, weighing the mass of the residue after drying, and determining the ratio of the mass of the components remaining after drying to the total mass of the sample before drying.

[0040] The viscosity of a 5% aqueous solution is measured by setting the sample at 25°C using a Brookfield viscometer at a rotation speed of 60 rpm for 1 minute. The aqueous filler composition of the present embodiment preferably contains a urethane associative thickener (D) having such properties, which makes it easy to apply with a wool roller, suppresses uneven hiding even when applied to a substrate having an uneven pattern formed on the surface, and forms a base coating film with a texture that does not affect the finish of the topcoat paint.

[0041] While it is unclear why the type of urethane associative thickener (D) provides the above effects, it is believed that urethane associative thickeners with a viscosity of 3000 mPa·sec or less when diluted with deionized water possess moderate hydrophobic properties. The presence of a specific amount of these thickeners in the coating solution is believed to control the viscosity of the coating solution to an appropriate level. As a result, the wool roller moves easily during application, improving workability. Furthermore, when the surface of the substrate is not flat but has a pattern or other irregularities, the coating tends to become thinner on the raised areas. However, when a specific urethane associative thickener (D) is used, the coating solution tends to remain on the raised areas, resulting in a base coat with minimal unevenness in coverage.

[0042] water: The aqueous filler composition of this embodiment contains water as a dilution medium. The water content may differ between the storage state and the painted state. In the stored state, the water content is 5 to 40 parts by mass, preferably 10 to 35 parts by mass, based on 100 parts by mass of the aqueous filler composition. In the painted state, the painter mixes water appropriately, taking into consideration the condition of the surface to be painted, the temperature during painting, etc. The amount mixed is preferably about 0 to 20 parts by mass, based on 100 parts by mass of the aqueous filler composition.

[0043] Carbon black paste (E): In some of the present embodiments, in order to achieve a brightness within the above range, the aqueous filler composition preferably contains a carbon black paste (E). The carbon black paste contains carbon black and water, and is a paste in which the carbon black is dispersed in water at a high concentration. The carbon black concentration of the carbon black paste (E), i.e., the amount of carbon black contained in the carbon black paste (E), is preferably 5 to 50% by mass, particularly 10 to 40% by mass. By using a carbon black paste (E) having a carbon black concentration within this range, the present filler composition can be stably produced as an aqueous filler composition, and can form a base coat film with little hiding unevenness without reducing cracking resistance and the like, and with a brightness that does not affect the finish of the subsequent top coat.

[0044] The carbon black paste (E) may contain additives such as a dispersant, an antifoaming agent, an antiseptic, and a rheology control agent, if necessary. Among these, dispersants are also called wetting agents, pigment dispersion resins, or resin dispersants, and are commercially available. Examples of the dispersants include polymeric compounds such as acrylic resins, maleic acid-based resins such as styrene-maleic acid copolymers, styrene-maleic anhydride copolymers, vinyl naphthalene-maleic acid copolymers, and vinyl acetate-maleic acid ester copolymers; urethane resins, polyvinyl alcohols; and vinyl acetate-crotonic acid copolymers, into which at least one group selected from the group consisting of an acid group, an amino group, and a polyoxyalkylene group has been introduced. The dispersants preferably contain an acid group. The solid content of the dispersant in the solid content of the carbon black paste (E) is preferably within a range of 1 to 50% by mass, and more preferably 2 to 40% by mass, from the viewpoint of obtaining a base coating film that has little hiding unevenness and does not affect the finish of the subsequent top coating. The content of the carbon black paste (E) in the present aqueous filler composition (as stored) is preferably 0.005 to 1% by mass, and particularly preferably 0.03 to 0.5% by mass.

[0045] Other ingredients: In addition to the components described above, the aqueous filler composition of this embodiment may contain other components such as an aqueous resin other than the first aqueous resin (A) and the second aqueous resin (B) having a glass transition temperature of 30°C or less, a crosslinking agent, a thickener other than the urethane associative thickener (D), a dispersant, a film-forming aid, a plasticizer, an antifreeze, an organic solvent, an antifoaming agent, an antiseptic, an antifungal agent, a catalyst, etc. Each of these other components may be used alone or in combination of two or more.

[0046] When the other aqueous resin is contained, the content of the other aqueous resin is preferably less than 50 parts by solid mass, particularly less than 10 parts by mass, per 100 parts by mass of the total solid mass of the resin contained in the aqueous filler composition. The crosslinking agent can be selected depending on the crosslinking functional group possessed by the aqueous resin component. Specific examples include hydrazide compounds, polyamine compounds, polyisocyanate compounds, and polycarboxylic acid compounds.

[0047] Examples of the other thickeners include polyacrylic acid-based thickeners, cellulose-based thickeners, and inorganic thickeners.

[0048] Aqueous filler composition:

[0049] The aqueous filler composition of the present embodiment forms a coating film with a brightness preferably in the range of 70 to 92, more preferably 80 to 90. When the brightness of the coating film is within the above range, it provides excellent hiding power even with a small coating amount, suppresses uneven hiding even on uneven surfaces, and provides a base coating film that has little effect on the top coating paint applied thereon.

[0050] In this specification, lightness is measured by the CIE 1976 L * a * b *It is expressed in a color system (based on JIS Z8781 4 (2013)) and can be measured using a commercially available colorimeter (for example, Konica Minolta's CR-400 color difference meter) in accordance with JIS 5600 4-4 and JIS 5600 4-5. The test piece for measuring lightness is prepared by placing an acrylic mold around the black and white opacifying paper specified in JIS 5600-4-1 1999 Hiding Power (for Light Color Paints) test, pouring the sample into it so that the dry film thickness is 0.5 mm, smoothing the surface with a spatula, and drying it at 23°C for 4 days before removing the mold.

[0051] Painting Method: The aqueous filler composition of this embodiment is applied using a wool roller. A wool roller is made by implanting fiber hairs on a cylindrical member, and those using wool-like fiber hairs are known. These wool rollers come in a variety of different hair lengths, materials, sizes, and shapes, and can be broadly classified into three types, classified by the length from the surface of the cylindrical member to the tip of the hair (hereinafter referred to as pile length). There are short-haired rollers with a pile height of about 4 to 5 mm, medium-haired rollers with a pile height of about 13 mm, and long-haired rollers with a pile height of 20 mm or more.

[0052] The aqueous filler composition of this embodiment provides a base coating film with little unevenness in covering even when applied in a thin, small amount, and has little effect on the finish of the subsequent topcoat. Specific examples of the amount applied include 100 to 450 g / m. 2 , especially 120-400g / m 2 The coating may be dried at room temperature or by heating, but room temperature drying is preferred. The coating amount is calculated from the consumed mass of the aqueous filler composition used in the coating step and the coating area.

[0053] Examples of objects on which a base coating film can be formed using the aqueous filler composition of this embodiment include interior and exterior wall surfaces, roofs, pillars, ceilings, gates, etc. of buildings such as houses, office buildings, public facilities, and commercial facilities, with building exterior walls being particularly preferred. Furthermore, examples of the substrate material include inorganic material substrates, wood substrates, metal substrates, and plastic substrates, and these may be those on which a previous coating film has been applied. The shape of the previous coating film is not limited, and it may be flat or may have various three-dimensional patterns formed on it. Examples of pattern patterns include lysine, orange peel, ripple, crater, stucco, trowel wave, and brushed finish. Furthermore, before applying the aqueous filler composition, a sealer coating may be applied depending on the type and condition of the object.

[0054] In this embodiment, after forming a base coating film using the aqueous filler composition, a topcoat paint is applied thereon. Topcoat paints known in the field of architectural coatings can be used without limitation as the topcoat paint. Specific examples include paints containing, as a resin binder, a water-based or solvent-based resin such as an acrylic resin, an acrylic silicone resin, a polyolefin resin, a silicone resin, a polyurethane resin, a fluororesin, or a biodegradable resin. It is preferable to use an aqueous paint containing a water-based resin.

[0055] The method for applying the topcoat paint is not particularly limited, and conventional methods such as roller, air spray, airless spray, lysine gun, universal gun, brush, and paintbrush application can be used. Drying at room temperature is preferred, but heat drying can also be used if necessary. The amount of topcoat paint to be applied is not particularly limited, but is preferably 100 to 450 g / m 2 , preferably 120 to 400 g / m 2 is within the range. The base coating film formed by the aqueous filler composition of this embodiment has excellent hiding power and crack resistance, so even if a thin topcoat paint is applied using a wool roller, it can give the coated object a beautiful appearance and provide sufficient protection. [Example]

[0056] The present invention will be described in more detail below with reference to Production Examples, Examples, and Comparative Examples, but the present invention is not limited thereto. In each example, "parts" means parts by mass, and "%" means % by mass.

[0057] Preparation of first aqueous resin (A) Manufacturing Example 1 A reaction vessel equipped with a thermometer, thermostat, stirrer, and dropping device was charged with 35 parts of deionized water and 1 part of Newcol 707SF (trade name, manufactured by Nippon Nyukazai Co., Ltd., an anionic surfactant having a polyoxyethylene chain, nonvolatile content 30%), and the mixture was stirred and mixed in a nitrogen stream and heated to 85° C. Next, 3% of a pre-emulsion obtained by emulsifying the components shown below and 8 parts of a 2.5% aqueous ammonium persulfate solution were added to the reaction vessel, and the temperature was maintained at 85° C. for 20 minutes. 40 parts deionized water 25 parts styrene 2-Ethylhexyl acrylate 70 parts 2-Hydroxyethyl acrylate 1 part Methacrylic acid 4 parts Newcall 707SF 8 copies The remaining pre-emulsion and 8 parts of a 2.5% aqueous solution of ammonium persulfate were then added dropwise to the reaction vessel over 4 hours, and the mixture was aged for 2 hours after the addition. The mixture was then cooled to 30°C, and the solid content was adjusted to 50% and the pH to 8.0 using aqueous ammonia and deionized water. The mixture was then filtered through a 200-mesh nylon cloth, yielding a water-dispersible aqueous resin (A1) with a glass transition temperature of -22°C.

[0058] Manufacturing Examples 2 to 5 Aqueous resins (A2), (A3-1), (A3-2), and (X) were synthesized in the same manner as in Production Example 1, except that the monomer compositions in Production Example 1 were changed to the formulations shown in Table 1 below.

[0059] [Table 1]

[0060] Preparation of second aqueous resin (B): Manufacturing Example 6 A reaction vessel equipped with a thermometer, thermostat, stirrer, and dropping device was charged with 120 parts of deionized water and 1 part of Newcol 707SF (trade name, manufactured by Nippon Nyukazai Co., Ltd., an anionic surfactant having a polyoxyethylene chain, nonvolatile content 30%), and the mixture was stirred and mixed in a nitrogen stream and heated to 85° C. Next, 3% of a pre-emulsion prepared by emulsifying the components shown below and 8 parts of a 2.5% aqueous ammonium persulfate solution were added to the reaction vessel, and the mixture was maintained at 85° C. for 20 minutes. 40 parts deionized water Ethyl acrylate 64.5 parts Ethyl methacrylate 5 parts 30 parts methacrylic acid 1,6-Hexanediol diacrylate 0.5 parts Newcall 707SF 15 copies The remaining pre-emulsion and 8 parts of a 2.5% aqueous ammonium persulfate solution were then added dropwise to the reaction vessel over 4 hours, and the mixture was aged for 2 hours after the addition. The mixture was then cooled to 30°C and adjusted to a solids content of 30% using deionized water. The mixture was then filtered through a 200-mesh nylon cloth and discharged to obtain a water-dispersible, internally crosslinked aqueous resin (B-1). The aqueous resin (B-1) had an acid value of 196 mgKOH / g on solid content.

[0061] Manufacturing Examples 7-12 Synthesis was carried out in the same manner as in Production Example 6, except that the monomer composition in Production Example 6 was changed to the blend shown in Table 2 below, to obtain aqueous resins (B-2) to (B-5) and aqueous resins (Y-1) to (Y-2) with a solid content of 30%.

[0062] [Table 2]

[0063] Carbon black paste manufacturing Manufacturing Examples 13-15 Carbon black pastes (P-1) to (P-3) were produced according to the formulations shown in Table 3 below.

[0064] [Table 3]

[0065] (Note 1) FLOWLEN G700AMP: Product name, manufactured by BYK Kyoei Co., Ltd., water-based wetting and dispersing agent, 2-methyl-2-amino-1-propanol salt of carboxyl group-containing polymer diluted with water, solid content 45% (Note 2) SN Deformer 395: Product name, antifoaming agent manufactured by San Nopco Ltd. (Note 3) NATROSOL 250HBR: Product name, manufactured by Ashland, hydroxyethyl cellulose.

[0066] Preparation of aqueous filler composition Examples 1 to 23 and Comparative Examples 1 to 9 The components shown in Table 4 were placed in a stainless steel container with stirring, and stirring was continued for 15 minutes until the mixture was homogenous using a Homo Disper manufactured by PRIMIX Co., Ltd., to produce aqueous filler compositions (X-1) to (X-32). Note that in Table 4, the blending amounts of materials containing volatile components are shown as masses including the volatile components.

[0067] [Table 4]

[0068] [Table 5]

[0069] [Table 6]

[0070] (Note 4) DISPER BYK-190: Trade name, manufactured by BYK Co., Ltd., water-based wetting and dispersing agent, aqueous solution of polyether-modified styrene-maleic anhydride copolymer, solids content 40% (Note 5) SN Thickener 615: Product name, manufactured by San Nopco Co., Ltd., polyacrylic acid-based thickener, active ingredient 10% (Note 6) SN Thickener 625N: Product name, manufactured by San Nopco Co., Ltd., urethane associative thickener, active ingredient 15% (Note 7) ADEKA NOL UH-420: Product name, manufactured by ADEKA Corporation, urethane associative thickener, active ingredient 30% (Note 8) Primal RM12W: Product name, manufactured by Dow Chemical Co., urethane associative thickener, active ingredient 19% (Note 9) ADEKA NOL UH-530: ADEKA Corporation, urethane associative thickener, active ingredient 30% (Note 10) SN Thickener 612NC: Product name, manufactured by San Nopco Co., Ltd., urethane associative thickener, active ingredient 45%, (Note 11) Viscosity of urethane associative thickeners: Each urethane associative thickener was diluted with deionized water to a concentration of 5% by mass of the active ingredient, and the sample was then cooled to 25°C and measured using a B-type viscometer at 60 rpm for 1 minute.

[0071] <Evaluation test> The aqueous filler compositions obtained in the examples and comparative examples were subjected to the following evaluations. The results are shown in Table 4. The brightness was measured according to the method described in the specification.

[0072] (1) Storage stability Each aqueous filler composition was placed in a container with a capacity of approximately 25 ml, filled to 80%, and stored in a thermostatic chamber at 40° C. for 10 days. After that, the temperature was returned to room temperature, and the state inside the container was visually observed, and the storage stability was evaluated according to the following criteria. ⊚: No sedimentation or viscosity change was observed. ◯: Slight sedimentation and / or viscosity increase is observed, but the original state is restored by stirring. △: Sedimentation and / or thickening was observed. ×: Significant sedimentation and / or significant increase in viscosity was observed.

[0073] (2) Wool roller painting workability On a slate board measuring approximately 1 square meter, "Ares Holder GII" (product name, Kansai Paint, water-based, slightly elastic base conditioner) was applied using a porous roller in a ripple pattern at a rate of 0.8 kg / m. 2 On top of that, "Ares Aqua Gloss" (trade name, Kansai Paint, acrylic water-based topcoat paint) was applied with a wool roller, toned to a blue-gray color, and dried at 23°C for 14 days. The resulting painted plate was considered the old paint film and used as the substrate. Each of the aqueous filler compositions obtained in the Examples and Comparative Examples was applied to this rippled painted surface using a wool roller ("Melon" wool roller, manufactured by PIA, bristle length 25 mm) at a coating amount of 220 g / m 2 The coating workability (ease of moving the wool roller, splashback of the paint) was evaluated. After that, the coating was dried at 23°C for 7 days to obtain a coated panel for evaluation.

[0074] (2-1) Ease of moving the wool roller The ease of application of the aqueous filler compositions of the Examples and Comparative Examples with a wool roller was evaluated according to the following criteria. ◎: The roller is light and very easy to move 〇: The rollers may feel a little heavy in some places, but are easy to move. △: The roller feels a little heavy and is a little difficult to move. ×: The roller feels very heavy and is very difficult to move.

[0075] (2-2) Paint bounce Each of the aqueous filler compositions of the Examples and Comparative Examples was applied with a wool roller, and the degree of splashing of the paint was evaluated according to the following criteria. ◎: Almost no bounce 〇: There is some bounce, but it is still practical △: There is obvious bounce ×: There is noticeable rebound.

[0076] (3) Hiding ability of water-based filler on patterned coating The painted panels prepared for the above evaluation of painting workability were visually observed from a distance of 50 cm, and the degree to which the blue-gray base color was visible was evaluated on the following four levels. ◎: The undercoat color is not noticeable ○: The base color shows through slightly in the convex parts, but is not noticeable when viewed from a distance of 1m. △: The base color is visible throughout the entire surface, and is slightly noticeable even when viewed from a distance of 1m. ×: The undercoat color is noticeably visible throughout the entire surface, and is quite noticeable even when viewed from a distance of 1 m.

[0077] (4) Texture of water-based filler on patterned coating The coated panels prepared in the above evaluation of painting workability were visually observed from a distance of 50 cm, and the overall texture of the water-based filler coating surface was evaluated using the following four levels. ◎: There are almost no roller marks (thread-like marks left by the roller), and the entire painted surface has a smooth, uniform texture. ○: Roller marks (thread-like marks left by the roller) are slightly visible, but when viewed from a distance of 1 m, the entire painted surface has a uniform texture. △: Roller marks (thread-like marks left by the roller) are visible on the entire painted surface, and the texture is somewhat poor even when viewed from a distance of 1m. ×: Roller marks (thread-like marks left by the roller passing over) are clearly visible on the entire painted surface, and the surface feels poor even when viewed from a distance of 1 m.

[0078] (5) Crack resistance The painted panels prepared in the above paint workability evaluation were cut into pieces measuring 20cm wide x 30cm long, and the back and sides were seal-painted with "Cera M Retan Clear" (a weak solvent-based two-component urethane clear paint manufactured by Kansai Paint Co., Ltd.). After drying for 48 hours, a temperature-cooling cycle test was carried out for a total of 10 cycles, with one cycle consisting of 18 hours of water immersion (23°C), 3 hours in air at -20°C, and 3 hours in air at 50°C. After this, the paint surface was visually inspected for cracks. ◎: No cracks 〇: Cracks occurred in less than 5% of the area △: Cracks are observed in an area of ​​5% or more but less than 50%. ×: Cracks are observed over 50% or more of the surface area.

[0079] (6) Hiding ability of topcoat A slate board measuring approximately 1 square meter was coated with Ares Holder GII (product name, Kansai Paint, water-based, slightly elastic base conditioner) at a rate of 0.8 kg / m using a porous roller to create a ripple pattern. 2 On top of that, "Ares Aqua Gloss" (trade name, Kansai Paint, acrylic water-based topcoat paint) was applied with a wool roller, toned to a blue-gray color, and dried at 23°C for 14 days. The resulting painted plate was considered to be the old paint film and used as the substrate. Each of the aqueous filler compositions obtained in the Examples and Comparative Examples was applied to this rippled painted surface with a wool roller ("Melon" wool roller, manufactured by PIA, bristle length 25 mm) at a coating amount of 180 g / m 2 After drying at 23°C for 7 days, 120g / m of "Cosmo Silicon White" (a water-based acrylic silicone topcoat paint manufactured by Kansai Paint Co., Ltd.) was applied on top. 2 The paint was applied using a wool roller ("Peach" wool roller, bristle length 20 mm, manufactured by Otsuka Brush Manufacturing) so that the paint was applied as shown above, and the paint was dried at 23°C for 7 days to obtain a test painted panel for evaluating the suitability for topcoating. The painted panel was visually observed from a distance of 50 cm, and the state of visibility of the paint film color formed from the water-based filler, which is the base color, was evaluated using the following four levels. ◎: The color of the coating is not noticeable ○: The color of the coating is visible in the convex parts, but is not noticeable when viewed from a distance of 1 m. △: The color of the coating is visible throughout ×: The color of the coating film is significantly visible throughout the entire surface.

Claims

1. An aqueous filler composition for forming a base coating film using a wool roller before applying a topcoat paint, a first aqueous resin (A), a second aqueous resin (B), a pigment (C), a urethane associative thickener (D), and water, the pigment volume concentration being within a range of 30 to 65%, the first aqueous resin (A) having a glass transition temperature of 30°C or lower, and the second aqueous resin (B) being resin particles having an internal crosslinked structure and having a solid content acid value of 100 mgKOH / g or higher; The aqueous filler composition has a solid content of the second aqueous resin (B) of 0.1 to 2.5 parts by mass, and a content of the urethane associative thickener (D) of 0.1 to 2.5 parts by mass, in terms of an active ingredient amount, based on 100 parts by mass of the solid content of the first aqueous resin (A).

2. The first aqueous resin (A) is A copolymer (A1) of polymerizable unsaturated monomers that is substantially free of both a carbonyl group-containing polymerizable unsaturated monomer and an alkoxysilyl group-containing polymerizable unsaturated monomer; and Copolymer (A2) of polymerizable unsaturated monomers containing a carbonyl group-containing polymerizable unsaturated monomer and an alkoxysilyl group-containing polymerizable unsaturated monomer The aqueous filler composition of claim 1 , comprising:

3. The first aqueous resin (A) is A copolymer (A1) of polymerizable unsaturated monomers that is substantially free of both a carbonyl group-containing polymerizable unsaturated monomer and an alkoxysilyl group-containing polymerizable unsaturated monomer; and Copolymer (A3) of polymerizable unsaturated monomers containing a carbonyl group-containing polymerizable unsaturated monomer and substantially not containing an alkoxysilyl group-containing polymerizable unsaturated monomer The aqueous filler composition of claim 1 , comprising:

4. The first aqueous resin (A) is A copolymer (A3-1) of polymerizable unsaturated monomers having a glass transition temperature of less than 0°C, containing a carbonyl group-containing polymerizable unsaturated monomer and substantially not containing an alkoxysilyl group-containing polymerizable unsaturated monomer; and A copolymer (A3-2) of polymerizable unsaturated monomers having a glass transition temperature of 0°C or higher, containing a carbonyl group-containing polymerizable unsaturated monomer and substantially not containing an alkoxysilyl group-containing polymerizable unsaturated monomer. The aqueous filler composition of claim 1 , comprising:

5. 3. The aqueous filler composition according to claim 1, wherein the second aqueous resin (B) comprises a copolymer of a polymerizable unsaturated monomer, and the polymerizable unsaturated monomer comprises ethyl acrylate and / or ethyl methacrylate.

6. The aqueous filler composition according to claim 1 or 2, wherein the pigment (C) comprises titanium dioxide and calcium carbonate.

7. 3. The aqueous filler composition according to claim 1, wherein the brightness of a coating film formed from the aqueous filler composition is within the range of 70 to 92.

8. 3. The aqueous filler composition according to claim 1, further comprising a carbon black paste (E), wherein the carbon black paste contains carbon black and water, and the carbon black concentration is within the range of 5 to 50 mass%.

9. 3. The aqueous filler composition according to claim 1, further comprising a carbon black paste (E), wherein the content of the carbon black paste (E) is within a range of 0.005 to 1 mass% with respect to the total amount of the aqueous filler composition.

10. 3. The aqueous filler composition according to claim 1, wherein the structural viscosity index (TI value) is 3.0 to 6.

0.

11. Applying the aqueous filler composition according to claim 1 or 2 to a building using a wool roller and drying it to form a base coating film; and and applying a topcoat paint onto the base coating film.

12. The aqueous filler composition according to claim 1 or 2 is applied to a building using a wool roller in an amount of 100 to 450 g / m ２ Apply the paint so that the area is within the range of , dry it, and form a base coating film; and applying a topcoat paint onto the basecoat film using a wool roller.

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