Hardening components

Abstract

To provide a curable composition which can produce a cured object which has excellent antibacterial ability, detergent resistance in washing, and excellent matting property and uneven feeling, the curable composition being reduced in a hue change before and after curing.SOLUTION: There is provided a curable composition comprising; a curable polymer; 2 pts.mass or less of an amine compound whose melting point is 25 to 80°C; particles whose diameters are 5 to 1000 μm; and an antibacterial agent, therefore from the curable composition, a cured object which has excellent antibacterial ability, detergent resistance in washing, excellent matting property and uneven feeling, can be produced, and before and after curing, a change of a hue is reduced. The curable composition does not damage design property and antibacterial property of other members which are used with the curable composition.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a curable composition. [Background technology]

[0002] In recent years, there has been an increasing demand for high design quality in buildings, and wall designs are becoming more diverse, especially for exterior walls and other walls that occupy a large area, due to improvements in printing technology and surface treatment processing technology for resin wall components.

[0003] Furthermore, given the current social situation, there is a growing demand for clean building materials, and in addition to the design features mentioned above, walls are also required to have antibacterial properties and detergent resistance when cleaning.

[0004] On the other hand, the wall is constructed by arranging wall members of a predetermined width vertically and horizontally, and the joints formed between the wall members are filled with a sealant. In order not to impair the design required of the wall members, the sealant is also required to have a matte finish and a textured appearance. Furthermore, the sealant is also required to have the antibacterial properties and detergent resistance required for cleaning, just like the wall.

[0005] Patent Document 1 discloses a curable composition having an uneven appearance, which contains a reactive polymer and spherical particles, and in which the content of (P1) spherical particles having a particle size of 850 to 1300 μm is 0.5 to 10 volume % of the composition, the content of (P2) spherical particles having a particle size of 250 to 600 μm is 0.5 to 10 volume % of the composition, and the content of (P3) spherical particles having a particle size of 600 to 850 μm is 45 volume % or less of the total of particles (P1) and particles (P2).

[0006] Patent Document 2 discloses a sealant composition containing (A) a modified polymer having a crosslinkable silyl group at its terminal, (B) an alkylamine having a melting point or solidification point of 50°C or higher and having an alkyl group with 20 or more carbon atoms, (C) an amine-based silane coupling agent having a triethoxysilyl group, (D) calcium carbonate having an average particle size of 300 to 450 μm, (E) black silica having an average particle size of 150 to 250 μm, (F) a filler, (G) a plasticizer, and (H) a curing catalyst.

[0007] Patent Document 3 discloses an antibacterial and antifungal organopolysiloxane composition that is less likely to discolor, and that contains an organopolysiloxane (A), a hydrolyzable silane compound and / or a partial hydrolyzate thereof (B), a triazolyl group-containing compound (C), and an inorganic antibacterial agent (D). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2019-151687 [Patent Document 2] Japanese Patent Application Publication No. 2019-151676 [Patent Document 3] Japanese Patent Application Publication No. 11-199777 Summary of the Invention [Problem to be solved by the invention]

[0009] However, even if the curable composition of Patent Document 1 contains an antibacterial agent as in Patent Document 3, there is a problem in that the cured product of the curable composition cannot exhibit sufficient antibacterial properties. In addition, there is also a problem in that, depending on the type of particles, the cured product of the curable composition may be discolored by detergent components.

[0010] Furthermore, even if the sealant composition of Patent Document 2 contains an antibacterial agent as in Patent Document 3, the cured product of the sealant composition cannot exhibit sufficient antibacterial properties. Furthermore, there is a problem in that the color tone of the sealant composition changes before and after curing, which can impair the color tone of the wall.

[0011] The present invention provides a curable composition that produces a cured product having excellent antibacterial properties, detergent resistance during cleaning, and excellent matte finish and textured feel, and that exhibits reduced change in color tone before and after curing. [Means for solving the problem]

[0012] The curable composition of the present invention contains 100 parts by mass of a curable polymer, 2 parts by mass or less of an amine compound having a melting point of 25 to 80° C., particles having a particle size of 5 to 1000 μm, and an antibacterial agent.

[0013] [Curable polymer] The curable composition contains a curable polymer (A). The curable polymer (A) is preferably cured at 0 to 100°C for ease of use.

[0014] The curable polymer may be a polymer having a known crosslinkable reactive group in the molecule. The crosslinkable reactive group is not particularly limited, and examples thereof include a hydrolyzable silyl group, an isocyanate group, an epoxy group, an amino group, and a hydroxyl group. A hydrolyzable silyl group is preferred because it is capable of producing a cured product with high reaction safety and strength. The crosslinkable reactive group may be used alone or in combination of two or more types.

[0015] The polymer constituting the curable polymer is not particularly limited, and examples thereof include polyether-based polymers, silicone-based polymers, polyurethane-based polymers, polysulfide-based polymers, acrylic-based polymers, polyisobutylene-based polymers, and rubber-based polymers. Polyether-based polymers and acrylic-based polymers are preferred, and polyether-based polymers are more preferred, as they improve the antibacterial properties of the cured product of the curable composition.

[0016] As the polymer constituting the curable polymer, a polymer having a polyoxyalkylene structure is more preferred, and specifically, a polyoxyalkylene polymer whose main chain structure contains a repeating unit represented by general formula (1) is preferred. -(R 1 -O)n- (1) (In the formula, R 1 represents an alkylene group having 1 to 14 carbon atoms, and n is the number of repeating units and is a positive integer.

[0017] An alkylene group is a divalent atomic group formed by removing two hydrogen atoms bonded to two different carbon atoms in an aliphatic saturated hydrocarbon, and includes both linear and branched atomic groups. Note that branched includes cases where one carbon (methyl group) is bonded as a side chain.

[0018] Examples of the alkylene group include an ethylene group, a propylene group [-CH(CH3)-CH2-], a trimethylene group [-CH2-CH2-CH2-], a butylene group, an amylene group [-(CH2)5-], and a hexylene group.

[0019] The main chain of the polyoxyalkylene polymer may be composed of only one type of repeating unit, or may be composed of two or more types of repeating units.

[0020] Examples of the main chain skeleton of the polyoxyalkylene polymer include polyoxyethylene, polyoxypropylene, polyoxybutylene, polyoxytetramethylene, polyoxyethylene-polyoxypropylene copolymer, and polyoxypropylene-polyoxybutylene copolymer, with polyoxypropylene being preferred.

[0021] The content of the repeating unit represented by general formula (1) in the main chain skeleton of the polyoxyalkylene polymer is preferably 90% by mass or more, more preferably 95% by mass or more, more preferably 99% by mass or more, and even more preferably 100% by mass.

[0022] The hydrolyzable silyl group refers to a group that undergoes a condensation reaction in the presence of moisture or a crosslinking agent, and if necessary, using a catalyst, such as a silicon-containing group or a silanol group having a hydrolyzable group bonded to a silicon atom. Note that a silanol group refers to a functional group (≡Si-OH) in which a hydroxy group (-OH) is directly bonded to a silicon atom.

[0023] The hydrolyzable group of the hydrolyzable silyl group is not particularly limited, and examples thereof include a hydrogen atom, a halogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an acid amide group, an aminooxy group, a mercapto group, and an alkenyloxy group.

[0024] Examples of hydrolyzable silyl groups include monoalkoxysilyl groups such as methoxysilyl group, ethoxysilyl group, dimethylmethoxysilyl group, and dimethylethoxysilyl group; dialkoxysilyl groups such as dimethoxysilyl group, methyldimethoxysilyl group, and methyldiethoxysilyl group; trialkoxysilyl groups such as trimethoxysilyl group and triethoxysilyl group; and halogenated silyl groups to which a halogen is bonded, such as trichlorosilyl group, among which alkoxysilyl groups are preferred, dialkoxysilyl groups are preferred, and dimethoxysilyl groups are preferred.

[0025] A polyoxyalkylene polymer having a hydrolyzable silyl group can be produced, for example, by reacting a polyoxyalkylene polymer having a functional group such as a hydroxyl group at its terminal with an organic compound having an active group and an unsaturated group that is reactive with the functional group, and then reacting the resulting reaction product with a hydrosilane having a hydrolyzable group to hydrosilylate the polymer.

[0026] The number average molecular weight of the curable polymer (A) is preferably 8000 or more, more preferably 9000 or more, more preferably 10000 or more, and more preferably 11000 or more. The number average molecular weight of the curable composition (A) is preferably 50000 or less, more preferably 40000 or less, more preferably 38000 or less, more preferably 35000 or less, more preferably 32000 or less, and more preferably 31000 or less.

[0027] The molecular weight distribution of the curable polymer (A) is preferably 1.6 or less, more preferably 1.5 or less, and more preferably 1.45 or less. When the molecular weight distribution of the curable polymer (A) is 1.6 or less, the viscosity of the curable polymer (A) decreases, and the workability of the curable composition improves.

[0028] In the present invention, the number-average molecular weight and weight-average molecular weight of the curable polymer are values ​​measured by GPC (gel permeation chromatography). Specifically, 6 to 7 mg of the curable polymer is collected, placed in a test tube, and then tetrahydrofuran (THF) is added to the test tube to dilute the curable polymer to a concentration of 1 mg / mL, resulting in a diluted solution. This measurement sample can be used to measure the number-average molecular weight and weight-average molecular weight of the curable polymer by GPC.

[0029] The number average molecular weight and weight average molecular weight of the curable polymer can be measured, for example, using the following measuring device and under the following measuring conditions. Measuring equipment Waters 2690 Measurement conditions Column: Shodex LF-804 (8.0 x 300 mm) x 2 Column temperature: 40℃ Mobile phase: THF Flow rate: 1mg / mL Injection volume: 50μL Detector: UV 260 nm

[0030] [Amine compounds] The curable composition contains an amine compound (B) having a melting point of 25 to 80°C (hereinafter, sometimes simply referred to as "amine compound (B)"). The inclusion of the amine compound (B) in the curable composition allows for a thin film of the amine compound (B) formed on the surface of the cured product of the curable composition (hereinafter, sometimes simply referred to as "cured product") due to a synergistic effect with the particles (C) described below. This allows for a small amount of the amine compound (B) to impart excellent matte properties to the cured product. The amine compound (B) also reduces the color change of the curable composition before and after curing, resulting in a cured product with excellent color tone and improved color matching with the exterior wall material. When the curable composition exhibits a dark color such as black or navy blue, the color tone of the curable composition is likely to change before and after curing. However, even in such cases, the color change of the curable composition before and after curing is reduced, and color change is generally prevented. Furthermore, since the film of the amine compound (B) is thin, the antibacterial agent can smoothly permeate the film of the amine compound (B), and the cured product exhibits excellent antibacterial properties. Also, since the surface of the cured product is covered with an extremely thin film of the amine compound (B), the cured product of the curable polymer (A) and the particles (C) can be protected from detergents, and color changes such as discoloration caused by detergents can be substantially prevented.

[0031] The amine compound (B) preferably contains a monoamine compound having one amino group (-NH2) per molecule, or a diamine compound having two amino groups (-NH2) per molecule, and more preferably contains a monoamine compound having one amino group (-NH2) per molecule. In the amine compound (B), the hydrogen atom of the amino group may be substituted with an organic group such as an alkyl group or an aryl group. Furthermore, it is preferable that the amine compound (B) does not contain a silicon atom. The amine compound (B) may be used alone or in combination of two or more types.

[0032] Preferred examples of the amine compound (B) include monoamine compounds represented by the following formula (2). R 2 -NH2(2) (In formula (2), R 2 is a linear or branched alkyl group or a monovalent saturated alicyclic hydrocarbon group.

[0033] R 2 Examples of the linear or branched alkyl group in the formula (I) include a decyl group, an isodecyl group, an undecyl group, a lauryl group, an isododecyl group, a tridecyl group, a myristyl group, a pentadecyl group, a palmityl group, a heptadecyl group, an n-hexadecyl group, an isohexadecyl group, a stearyl group, an isooctadecyl group, a nonadecyl group, an eicosyl group, and a behenyl group, and preferably a lauryl group, an isododecyl group, a tridecyl group, a myristyl group, a pentadecyl group, a palmityl group, a heptadecyl group, an n-hexadecyl group, an isohexadecyl group, a stearyl group, an isooctadecyl group, a nonadecyl group, an eicosyl group, and a behenyl group.

[0034] In the amine compound (B) represented by formula (2), R 2 The number of carbon atoms in R is preferably 12 or more, more preferably 16 or more, and even more preferably 17 or more. 2 The number of carbon atoms in R is preferably 40 or less, more preferably 30 or less, and even more preferably 25 or less. 2 By using the amine compound (B) having the number of carbon atoms within the above range, a synergistic effect with the particles (C) can be achieved, which reduces the change in color tone before and after curing of the curable composition cured product, while improving the matte properties.

[0035] As the amine compound (B), laurylamine (C 12 H 25 -NH2, melting point: 28°C), stearylamine (C 18 H 37 -NH2, melting point: 50°C), myristylamine (melting point: 38°C), cetylamine (n-hexadecylamine, C 16 H 33 -NH2, melting point: 47°C), behenylamine (melting point: 63°C) are preferred.

[0036] The melting point of the amine compound (B) is preferably 25°C or higher, more preferably 26°C or higher, more preferably 27°C or higher, more preferably 35°C or higher, more preferably 40°C or higher, and more preferably 45°C or higher. A melting point of the amine compound (B) of 25°C or higher reduces stickiness on the surface of a cured product of the curable composition and reduces changes in the color tone of the cured product due to foreign matter adhering to the surface of the cured product. The melting point of the amine compound (B) is preferably 80°C or lower, more preferably 70°C or lower, more preferably 60°C or lower, more preferably 55°C or lower, and more preferably 50°C or lower. A melting point of the amine compound (B) of 80°C or lower allows the amine compound (B) to be formed on the surface of the cured product to be mixed evenly throughout the curable composition, thereby reducing the film thickness of the amine compound (B) and forming a film of the amine compound (B) having a uniform film thickness on the surface of the cured product. Therefore, while imparting excellent matte properties to the cured product, it is possible to further reduce the change in color tone of the curable composition before and after curing due to the amine compound (B), thereby producing a cured product with excellent color tone and further improving the color harmony with the exterior wall material. Furthermore, since the film of the amine compound (B) is thin, the antibacterial agent can smoothly permeate the film of the amine compound (B), and the cured product exhibits excellent antibacterial properties.

[0037] In the present invention, the melting point of the amine compound (B) refers to the temperature measured by differential scanning calorimetry (DSC) in accordance with JIS K7121 (1987). Specifically, using a differential scanning calorimeter (e.g., a "DSC-60" manufactured by Shimadzu Corporation), the amine compound (B) is heated from 10°C to 150°C at a heating rate of 5°C / min, and the melting peak temperature of the DSC curve during this heating process is taken as the melting point of the amine compound (B). When there are multiple melting peaks, the temperature at the apex of the melting peak with the greatest endothermic heat is taken as the melting point.

[0038] The content of the amine compound (B) in the curable composition is preferably 0.1 parts by mass or more, more preferably 0.2 parts by mass or more, and more preferably 0.3 parts by mass or more, per 100 parts by mass of the curable polymer (A). The content of the amine compound (B) in the curable composition is preferably 2 parts by mass or less, more preferably 1.5 parts by mass or less, more preferably 1.3 parts by mass or less, more preferably 1.1 parts by mass or less, and more preferably 1.0 parts by mass or less, per 100 parts by mass of the curable polymer (A). When the content of the amine compound (B) is 0.1 parts by mass or more, a thin film of the amine compound (B) is formed on the surface of the cured product of the curable composition, protecting the cured product of the curable polymer (A) and the particles (C) from detergents and substantially preventing color changes such as discoloration caused by detergents. When the content of the amine compound (B) is 2 parts by mass or less, color changes before and after curing of the curable composition are reduced, allowing the composition to match the exterior wall material.

[0039] [Particles with a particle size of 5 to 1000 μm (C)] The curable composition contains particles (C) having a particle diameter of 5 to 1000 μm (hereinafter, sometimes simply referred to as "particles (C)"). The inclusion of particles (C) in the curable composition can impart a moderately rough texture to a cured product of the curable composition, thereby improving the matte properties of the cured product. Furthermore, by making the particle diameter of particles (C) 5 to 1000 μm, unevenness is formed in the cured product, resulting in a moderate surface area. By causing the amine compound (B) to bleed out onto the uneven surface having this moderate surface area, a thin film of the amine compound (B) can be formed on the surface of the cured product. Forming the amine compound (B) into a thin film generally prevents the unevenness formed by the particles (C) from being reduced by the thin film of the amine compound (B), effectively achieving a matte effect due to the unevenness. Furthermore, the matte effect of the amine compound (B) also acts, resulting in an excellent matte effect of the cured product. The presence of particles (C) allows a thin film of the amine compound (B) to be easily formed, thereby enabling a reduction in the content of the amine compound (B). As a result, the change in color tone caused by the amine compound (B) before and after curing of the curable composition can be reduced, improving the color harmony with the exterior wall material, and the antibacterial agent can easily permeate the film of the amine compound (B), allowing the cured product to exhibit excellent antibacterial properties.

[0040] The particles (C) are not particularly limited as long as they are solid particles at -40 to 100°C and have a particle diameter of 5 to 1000 µm, and examples thereof include inorganic particles containing inorganic materials such as minerals, shirasu, ceramics, and glass, organic particles containing synthetic resins such as silicone resins, epoxy resins, polystyrene, acrylic resins, and phenolic resins, and composite particles combining inorganic materials and synthetic resins. The particles (C) may be used alone or in combination of two or more types.

[0041] The particle diameter of the particles (C) is 5 μm or more, preferably 10 μm or more, more preferably 20 μm or more, more preferably 30 μm or more, more preferably 35 μm or more, more preferably 40 μm or more, and more preferably 45 μm or more. The particle diameter of the particles (C) is 1000 μm or less, preferably 900 μm or less, more preferably 800 μm or less, more preferably 700 μm or less, more preferably 650 μm or less, and more preferably 600 μm or less. When the particle diameter of the particles (C) is 5 μm or more, appropriate irregularities are formed on the surface of the cured product of the curable composition, improving the matte finish and textured appearance of the cured product and improving the antibacterial properties of the cured product. When the particle diameter of the particles (C) is 1000 μm or less, appropriate irregularities are formed on the cured product, allowing the antibacterial agent that has penetrated the surface of the cured product to be well exposed to the outside, imparting excellent antibacterial properties to the cured product. The particle size of the particles (C) refers to the equivalent sphere diameter (the diameter when converted into a sphere of the same volume) measured by laser diffraction.

[0042] The particles (C) contain first particles having a particle size within a predetermined range and second particles having a particle size greater than the upper limit of the particle size range of the first particles, thereby forming fine irregularities on the surface of a cured product of the curable composition, thereby further improving the matte finish and textured appearance of the cured product surface. Specifically, the particles (C) preferably contain first particles having a particle size of 5 μm or more and 45 μm or less and second particles having a particle size of more than 45 μm and 1000 μm or less, more preferably first particles having a particle size of 5 μm or more and 45 μm or less and second particles having a particle size of 46 μm or more and 700 μm or less, and even more preferably first particles having a particle size of 5 μm or more and 45 μm or less and second particles having a particle size of 46 μm or more and 650 μm or less.

[0043] In particles (C), the content ratio of the first particles to the second particles (mass of the first particles / mass of the second particles) is preferably 0.5 or more, more preferably 0.6 or more, more preferably 0.7 or more, and more preferably 0.8 or more. In particles (C), the content ratio of the first particles to the second particles (mass of the first particles / mass of the second particles) is preferably 1.5 or less, more preferably 1.4 or less, more preferably 1.3 or less, and more preferably 1.2 or less.

[0044] In the curable composition, the volume concentration of particles (C) is preferably 1% by volume or more, more preferably 2% by volume or more, and more preferably 3% by volume or more. In the curable composition, the volume concentration of particles (C) is preferably 10% by volume or less, more preferably 9.8% by volume or less, and more preferably 9.5% by volume or less. When the volume concentration of particles (C) is 1% by volume or more, appropriate irregularities are formed on the surface of a cured product of the curable composition, improving the matte finish and textured feel of the cured product and improving the antibacterial properties of the cured product. When the volume concentration of particles (C) is 10% by volume or less, the irregularities of the cured product are of appropriate size, allowing the antibacterial agent that has penetrated the surface of the cured product to be well exposed to the outside, imparting excellent antibacterial properties to the cured product.

[0045] The volume concentration of the particles (C) refers to the percentage of the total volume of the particles (C) in the volume of the curable composition, and is expressed by the following formula. Volume concentration (volume%) of particles (C) = 100 × total volume of particles (C) / total volume of curable composition

[0046] The particles (C) may be either solid with no internal voids or hollow with internal voids. When the curable composition is applied, the particles (C) with a low specific gravity tend to come out to the surface of the curable composition, forming irregularities on the surface of the cured product of the curable composition, thereby improving the matte properties of the cured product.

[0047] When the particles (C) are hollow particles, the porosity of the particles (C) is preferably 20% or more, more preferably 25% or more, and more preferably 30% or more. The porosity of the particles (C) is preferably 80% or less, preferably 75% or less, and more preferably 70% or less. When the porosity of the particles (C) is within the above range, the particles (C) can easily protrude to the surface of the curable composition, forming irregularities on the surface of a cured product of the curable composition, and improving the matte properties of the cured product.

[0048] The porosity of the particles (C) is a value calculated based on the following. Porosity (%) of particle (C) = 100 × bulk density (g / cm 3 ) / true density(g / cm 3 )

[0049] The bulk density refers to the packed bulk density defined in JIS R1628. The true density refers to the density of the volume of only the particles themselves measured by the Gay-Lussac pycnometer method defined in JIS Z8807.

[0050] The content of particles (C) in the curable composition is preferably 3 parts by mass or more, more preferably 4 parts by mass or more, and more preferably 5 parts by mass or more, per 100 parts by mass of the curable polymer. The content of particles (C) in the curable composition is preferably 30 parts by mass or less, more preferably 28 parts by mass or less, and more preferably 25 parts by mass or less, per 100 parts by mass of the curable polymer. When the content of particles (C) is 3 parts by mass or more, appropriate irregularities are formed on the surface of the cured product of the curable composition, improving the matte finish and textured appearance of the cured product and improving the antibacterial properties of the cured product. When the content of particles (C) is 30 parts by mass or less, the irregularities of the cured product can be made appropriate in size, allowing the antibacterial agent that has penetrated the surface of the cured product to be well exposed to the outside, imparting excellent antibacterial properties to the cured product.

[0051] The most preferred combination of amine compound (B) and particles (C) with a particle size of 30 μm or greater is one in which the amine compound (B) contains 1.2 parts by weight or less of an amine compound with a melting point of approximately 50°C, and the particles (C) contain particles with a particle size of 100 to 300 μm. When the amine compound with a melting point of approximately 50°C is 1.2 parts by weight or less and particles with a particle size of 100 to 300 μm are included, the unevenness of the particles expands the surface of the cured product, reducing the thickness of the amine compound coating the surface of the cured product. This allows antibacterial properties to be exerted without inhibiting the penetration of the antibacterial agent component into the surface of the cured product. Furthermore, the matting effect caused by diffused reflection of light by the unevenness of the particles allows for a reduction in the amount of amine compound added as a matting agent, thereby minimizing the impact of the amine compound on color tone.

[0052] [Antibacterial agent] The curable composition contains an antibacterial agent (D). By containing the antibacterial agent (D), antibacterial properties can be imparted to a cured product of the curable composition.

[0053] As the antibacterial agent (D), known antibacterial agents can be used, and both inorganic and organic antibacterial agents can be used. Inorganic antibacterial agents are preferred, and metal antibacterial agents are more preferred, because they are easily mixed into the curable polymer and can reduce runoff when the surface of the cured product of the curable composition is washed with a detergent.

[0054] Examples of inorganic antibacterial agents include metal-based antibacterial agents in which metal atoms (e.g., silver, copper, zinc, etc.) are contained in inorganic compounds (e.g., minerals, etc.), and photocatalytic antibacterial agents such as titanium oxide.

[0055] The method for incorporating a predetermined metal atom into an inorganic compound is not particularly limited, and examples thereof include a method of supporting the metal atom on an inorganic compound by physical adsorption or chemical adsorption, a method of substituting a metal ion for a cation contained in an inorganic compound by an ion exchange reaction to incorporate the metal atom into the inorganic compound, a method of supporting the metal atom on an inorganic compound as metallic gold, metallic silver, metallic copper, silver oxide, or copper oxide, a method of supporting the metal atom on an inorganic compound as a metal complex (e.g., a silver thiosulfato complex), a method of incorporating the metal atom as a glass component (e.g., a method of incorporating the metal atom as a glass component of a soluble glass such as SiO-BO-NaO-based glass), a method of supporting a compound containing a metal atom on an inorganic compound using a binder, a method of supporting the compound by implanting a silver compound or copper compound into the inorganic compound, and a method of forming a thin layer of a compound containing a metal atom on the surface of an inorganic compound by a thin film formation method such as vapor deposition, dissolution-precipitation reaction, or sputtering.

[0056] In the metal-based antibacterial agent, the content of metal atoms is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, more preferably 0.4% by mass or more, and more preferably 0.5% by mass or more. The content of metal atoms is preferably 10% by mass or less, more preferably 9% by mass or less, more preferably 8% by mass or less, and more preferably 7% by mass or less. When the content of metal atoms is 0.1% by mass or more, excellent antibacterial properties can be imparted to the cured product of the curable composition. When the content of metal atoms is 10% by mass or less, coloration of the curable composition can be suppressed.

[0057] When an inorganic antibacterial agent (D) is used, zeolite is preferred because of the ease with which metal ions can be supported.

[0058] The crystal structure of the zeolite is not particularly limited, and examples thereof include A-type, ferrierite-type, MCM-22-type, ZSM-5-type, mordenite-type, L-type, Y-type, X-type, and beta-type. From the viewpoint of stable support of metal atoms, A-type, Y-type, and X-type are preferred, and A-type is more preferred.

[0059] Examples of organic antibacterial agents include surfactant-based antibacterial agents such as benzalkonium chloride, alkyldi(aminoethyl)glycine hydrochloride, and fatty acid monoglycerides; antibacterial agents derived from natural products such as chitosan-based antibacterial agents and hinokitiol-based antibacterial agents; biguanide-based antibacterial agents such as chlorhexidine gluconate; alcohol-based antibacterial agents, phenol-based antibacterial agents, anilide-based antibacterial agents, iodine-based antibacterial agents, imidazole-based antibacterial agents, thiazole-based antibacterial agents, isothiazolone-based antibacterial agents, triazine-based antibacterial agents, nitrile-based antibacterial agents, fluorine-based antibacterial agents, and organometallic antibacterial agents.

[0060] The average particle size of the antibacterial agent (D) is preferably 0.1 μm or more, more preferably 0.2 μm or more, more preferably 0.3 μm or more, and more preferably 0.5 μm or more. The average particle size of the antibacterial agent (D) is preferably 11 μm or less, more preferably 10 μm or less, and more preferably 5 μm or less. When the average particle size of the antibacterial agent (D) is 0.1 μm or more, the antibacterial agent (D) can be uniformly dispersed in the curable polymer without agglomeration, allowing the antibacterial agent to uniformly penetrate the surface of the cured product, thereby enabling all cured products to exhibit excellent antibacterial properties. When the average particle size of the antibacterial agent (D) is 11 μm or less, the surface area of ​​the antibacterial agent (D) is increased, thereby increasing the antibacterial component on the surface of the cured product and improving the antibacterial properties of the cured product.

[0061] The average particle size of the antibacterial agent (D) is a value measured by image analysis using a transmission electron microscope (TEM). TEM is performed using a transmission electron microscope (accelerating voltage 200 kV, observation magnification 30,000 times). The antibacterial agent is lightly crushed in a mortar, ultrasonically dispersed in acetone, dropped onto a plastic support film, and air-dried to prepare a microscopic sample. Photographs are then taken of the sample. For each primary particle in the photograph, the arithmetic mean of the longest diameter R1 and the diameter R2 perpendicular to its midpoint is calculated, and this arithmetic mean is taken as the particle size of the primary particle. The particle sizes of a total of 300 primary particles are measured, and the arithmetic mean of the primary particle diameters is taken as the average particle size of the antibacterial agent. For TEM, a commercially available transmission electron microscope, such as that sold by JEOL Ltd. under the trade name "JEM-2100," can be used.

[0062] The content of the antibacterial agent (D) in the curable composition is preferably 0.0001 parts by mass or more, more preferably 0.0003 parts by mass or more, per 100 parts by mass of the curable polymer (A). The content of the antibacterial agent (D) in the curable composition is preferably 10 parts by mass or less, more preferably 3 parts by mass or less, per 100 parts by mass of the curable polymer (A). When the content of the antibacterial agent (D) is 0.0001 parts by mass or more, the antibacterial properties of the curable composition are improved. When the content of the antibacterial agent (D) is 10 parts by mass or less, the change in color tone before and after the effect of the curable composition can be suppressed.

[0063] [Filling material] The curable composition may contain particles having a particle size of less than 5 μm or particles having a particle size of more than 1000 μm in addition to the particles (C), within the range that does not impair the physical properties of the composition.

[0064] The curable composition may contain calcium carbonate having a particle size of less than 5 μm as a filler, such as heavy calcium carbonate, precipitated calcium carbonate, calcium carbonate chloride, and light calcium carbonate.

[0065] Ground calcium carbonate can be obtained by, for example, grinding natural calcium carbonate such as natural chalk, marble, or limestone into a fine powder.

[0066] Precipitated calcium carbonate can be produced, for example, by using limestone as a raw material and subjecting it to a chemical reaction.

[0067] The calcium carbonate may or may not be surface-treated. When the calcium carbonate is surface-treated, it is preferably treated with a fatty acid, a fatty acid ester, or a fatty acid metal salt, and more preferably treated with a fatty acid.

[0068] Examples of fatty acids include caproic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, alaic acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, melissic acid, obscylic acid, caroleic acid, undecylenic acid, linderic acid, tsuzuic acid, physeteric acid, moristoic acid, palmitoleic acid, petroselinic acid, oleic acid, elaidic acid, asclevic acid, vaccenic acid, gadoleic acid, gondoic acid, cetoleic acid, erucic acid, brassidic acid, selacholeic acid, ximenic acid, lumecic acid, sorbic acid, and linoleic acid. Of these, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid are preferred.

[0069] Examples of fatty acid esters include stearyl stearate, lauryl stearate, stearyl palmitate, and lauryl palmitate.

[0070] Examples of fatty acid metal salts include sodium salts and potassium salts of the above fatty acids, and preferred are sodium salts of lauric acid, sodium salts of myristic acid, sodium salts of palmitic acid, sodium salts of stearic acid and sodium salts of oleic acid.

[0071] The particle size of the filler is preferably 0.001 μm or more, more preferably 0.008 μm or more, more preferably 0.01 μm or more, more preferably 0.02 μm or more, and more preferably 0.03 μm or more. The particle size of the filler is preferably 0.2 μm or less, more preferably 0.008 μm or less, more preferably 0.01 μm or less, more preferably 0.02 μm or less, and more preferably 0.03 μm or less.

[0072] The particle size of the filler refers to a value calculated based on the following formula using the specific surface area value per 1 g of the filler, and for example, a powder specific surface area measuring device commercially available from Shimadzu Corporation under the product name "SS-100 Model" can be used. Average particle diameter (μm) = 6 x 10000 / (specific gravity x specific surface area)

[0073] In the curable composition, the content of the filler is preferably 100 parts by mass or more relative to 100 parts by mass of the curable polymer (A). In the curable composition, the content of the filler is preferably 300 parts by mass or less, more preferably 250 parts by mass or less, relative to 100 parts by mass of the curable polymer (A).

[0074] [Silanol condensation catalyst] The curable composition preferably contains a silanol condensation catalyst, which is a catalyst for promoting a dehydration condensation reaction between silanol groups formed by, for example, hydrolysis of a hydrolyzable silyl group when the curable polymer contains the hydrolyzable silyl group.

[0075] The silanol condensation catalyst is not particularly limited, and examples thereof include organotin compounds such as dibutyltin diacetylacetonate, dibutyltin oxylaurate, dibutyltin dilaurate, dibutyltin oxide, dibutyltin diacetate, dibutyltin phthalate, bis(dibutyltin laurate) oxide, dibutyltin bis(acetylacetonate), dibutyltin bis(monoester maleate), tin octoate, dibutyltin octoate, dioctyltin oxide, dibutyltin bis(triethoxysilicate), dioctyltin bis(triethoxysilicate), dioctyltin dilaurate, bis(dibutyltin bistriethoxysilicate) oxide, and dibutyltin oxybisethoxysilicate. Examples include organotin compounds such as tetra-n-butoxy titanate and tetraisopropoxy titanate; cycloamidine compounds such as 1,5,7-triazabicyclo[4.4.0]dec-5-ene, 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene, 1,8-diazabicyclo[5.4.0]undec-7-ene, 6-dibutylamino-1,8-diazabicyclo[5.4.0]undec-7-ene, and 1,5-diazabicyclo[4.3.0]non-5-ene; and dibutylamine-2-ethylhexoate. These compounds are preferred because they can improve the curability and storage stability of the curable composition. Other acidic and basic catalysts can also be used as silanol condensation catalysts. The silanol condensation catalysts may be used alone or in combination.

[0076] The content of the silanol condensation catalyst in the curable composition is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, per 100 parts by mass of the curable polymer (A). The content of the silanol condensation catalyst in the curable composition is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and more preferably 3 parts by mass or less, per 100 parts by mass of the curable polymer (A).

[0077] [Silane coupling agents] The curable composition may further contain a silane coupling agent.

[0078] The silane coupling agent improves the adhesiveness of the cured product of the curable composition, so it is preferable that the curable composition contains an amino group-containing silane coupling agent or an epoxy group-containing silane coupling agent, and it is more preferable that the curable composition contains an amino group-containing silane coupling agent.

[0079] The amino group-containing silane coupling agent means a compound containing, in one molecule, a silicon atom to which an alkoxy group is bonded and a functional group containing a nitrogen atom. The amino group-containing silane coupling agent is not particularly limited, and examples thereof include 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, N,N'-bis-[3-(trimethoxysilyl)propyl]ethylenediamine, N,N'-bis-[3-(triethoxysilyl)propyl]ethylenediamine, N,N'-bis-[3-(methyldimethoxysilyl)propyl]ethylenediamine, N,N'-bis-[3-(trimethoxysilyl)propyl]hexamethylenediamine, and N,N'-bis-[3-(triethoxysilyl)propyl]hexamethylenediamine, among which N-(2-aminoethyl)-3-aminopropyltrimethoxysilane is preferred.

[0080] The epoxy group-containing silane coupling agent refers to a compound containing a silicon atom to which an alkoxy group is bonded and a functional group containing an epoxy group in one molecule.The epoxy group-containing silane coupling agent is not particularly limited, and examples thereof include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethyldiethoxysilane, and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and 3-glycidoxypropyltriethoxysilane is preferred.

[0081] The content of the silane coupling agent in the curable composition is preferably 0.1 parts by mass or more, more preferably 1 part by mass or more, relative to 100 parts by mass of the curable polymer (A).The content of the silane coupling agent in the curable composition is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, relative to 100 parts by mass of the curable polymer (A).

[0082] [Plasticizer] The curable composition may contain a plasticizer. The plasticizer is not particularly limited, and examples thereof include phthalates such as dibutyl phthalate, di(2-ethylhexyl) phthalate, diisononyl phthalate, diisodecyl phthalate, and butyl benzyl phthalate; non-aromatic dibasic acid esters such as dioctyl adipate, dioctyl sebacate, dibutyl sebacate, and isodecyl succinate; aliphatic esters such as butyl oleate and methyl acetyl ricinoleate; polyalkylene glycol esters such as diethylene glycol dibenzoate, triethylene glycol dibenzoate, and pentaerythritol ester; phosphate esters such as tricresyl phosphate and tributyl phosphate; trimellitic acid esters; polybutadiene, polybutene, polyisobutylene, butadiene-acrylonitrile, and polychloroprene. Examples of suitable plasticizers include: chlorinated paraffins; hydrocarbon oils such as alkyldiphenyls and partially hydrogenated terphenyls; process oils; polyether polyols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol, and polyether polyol derivatives in which the hydroxyl groups of polyether polyols have been converted to ester groups, ether groups, etc.; epoxy plasticizers such as epoxidized soybean oil and benzyl epoxy stearate; polyester plasticizers obtained from dibasic acids such as sebacic acid, adipic acid, azelaic acid, and phthalic acid and dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, and dipropylene glycol; and vinyl polymers obtained by polymerizing vinyl monomers, including acrylic plasticizers, by various methods. These plasticizers may be used alone or in combination.

[0083] [Other additives] The curable composition may contain other additives such as a dehydrating agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a pigment, a dye, an anti-settling agent, an anti-fungal agent, etc. Among these, an antioxidant is preferred.

[0084] Examples of antioxidants include hindered phenol antioxidants, monophenol antioxidants, bisphenol antioxidants, and polyphenol antioxidants, with hindered phenol antioxidants being preferred. The content of the antioxidant in the curable composition is preferably 0.1 parts by mass or more, more preferably 0.3 parts by mass or more, per 100 parts by mass of the curable polymer (A). The content of the antioxidant in the curable composition is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, per 100 parts by mass of the curable polymer (A).

[0085] The curable composition may be colored by incorporating a pigment or dye. Pigments and dyes can be used without any particular limitation. Pigments are preferred. The pigment may be either an inorganic pigment or an organic pigment. Specific examples of inorganic pigments include black pigments such as carbon black, titanium black, and graphite; and metal oxides, nitrides, and oxynitrides. Examples of metals include at least one of iron, cobalt, aluminum, cadmium, lead, copper, titanium, magnesium, chromium, zinc, and antimony. The content of the pigment in the curable composition is not particularly limited, and is preferably 0.1 parts by mass or more, more preferably 1 part by mass or more, and more preferably 5 parts by mass or more, per 100 parts by mass of the curable polymer (A). The content of the pigment in the curable composition is preferably 80 parts by mass or less, more preferably 50 parts by mass or less, more preferably 30 parts by mass or less, and more preferably 20 parts by mass or less, per 100 parts by mass of the curable polymer (A).

[0086] Generally, if the color tone of a curable composition changes before and after curing, a problem may arise in which the intended color tone cannot be obtained after curing. Such a problem is likely to occur when the curable composition is colored using a pigment or dye (especially a black pigment). However, with the curable composition of the present invention, even when a pigment or dye is used, the change in color tone before and after curing can be reduced, and the intended color tone can be obtained after curing. Therefore, since the effects of the present invention are particularly easily exhibited, it is preferable that the curable composition contains at least one of a pigment and a dye, and it is more preferable that the curable composition contains a black pigment.

[0087] [Curable composition] The curable composition can be produced by mixing the curable polymer (A), the amine compound (B), the particles (C), the antibacterial agent (D), and other additives as needed, preferably under reduced pressure.

[0088] The curable composition cures to form a cured product due to moisture (water) in the air or moisture (water) contained in components such as wall members. The curable composition can be used as a sealant for joint structures to form joint structures.

[0089] The cured product produced by curing the curable composition has a matte surface and a textured texture, and has a reduced gloss. The gloss of the cured product of the curable composition is preferably 15 or less, more preferably 13 or less, more preferably 10 or less, and still more preferably 8 or less.

[0090] The gloss of the cured product can be measured using a 60-degree specular gloss meter, such as the gloss meter commercially available from Tasco Japan under the trade name "TMS-724."

[0091] The cured product produced by curing the curable composition preferably has a surface irregularity with a maximum height Pz of 100 μm or more, which allows the irregularities on the surface of the cured product to have an appropriate size, allowing the antibacterial agent that has permeated the surface of the cured product to be well exposed to the outside, thereby imparting excellent antibacterial properties to the cured product.

[0092] The maximum height Pz of the uneven shape on the surface of a cured product of the curable composition is preferably 100 μm or more, more preferably 120 μm or more, more preferably 145 μm or more, more preferably 500 μm or more, and more preferably 1000 μm or more. The maximum height Pz of the uneven shape on the surface of a cured product of the curable composition is preferably 3000 μm or less, more preferably 2800 μm or less, and more preferably 2500 μm or less. By setting the maximum height Pz of the uneven shape to 3000 μm or less, the antibacterial agent that has permeated the surface of the cured product can be well exposed to the outside, and the antibacterial properties of the cured product can be maintained.

[0093] The maximum height Pz of the irregularities on the surface of the cured product of the curable composition is the "maximum height Pz of the cross-sectional curve" in accordance with JIS B0601:2013.

[0094] The maximum height Pz of the uneven shape can be measured using an electron microscope (for example, a "VHX Series Microscope" manufactured by Keyence Corporation). For example, when a "VHX Series Microscope" manufactured by Keyence Corporation is used as the electron microscope, the surface of the cured product of the curable composition is observed with the electron microscope (magnification 20x) to obtain three-dimensional image data, and then this three-dimensional image data is analyzed using a DFD (Depth from Defocus) analysis application installed in the "VHX Series Microscope," thereby measuring the maximum height Pz of the uneven shape on the surface of the cured product of the curable composition.

[0095] The average thickness of the cured product produced by curing the curable composition is not particularly limited and may be determined depending on the application of the curable composition. The average thickness of the cured product of the curable composition is preferably 100 μm or more, more preferably 500 μm or more. The average thickness of the cured product of the curable composition is preferably 20,000 μm or less, more preferably 10,000 μm or less. The average thickness of the cured product of the curable composition can be determined by measuring the thickness of the cured product at any 20 points and calculating the arithmetic mean of the obtained measurements.

[0096] A method of applying a curable composition to a joint to obtain a joint structure is to fill the joint with the curable composition and then cure it to harden it. The resulting joint structure has wall members that constitute the walls of an architectural structure and a cured product of the curable composition that has been filled into the joints formed between adjacent wall members. Examples of the walls of an architectural structure include exterior walls, interior walls, and ceilings.

[0097] Joints in the walls of architectural structures include those formed at joints. Wall components can be any component that constitutes the walls of architectural structures, and do not necessarily have to be plate-shaped. They can also be components with an openable opening formed in a portion, such as a sash (window frame), and include components that constitute one side of an architectural structure. Examples of wall components include mortar boards, concrete boards, ceramic siding boards, metal siding boards, ALC boards, metal plates, sashes, wood-based materials such as plywood and medium-density fiberboard (MDF), tiles, vinyl chloride, melamine resin, epoxy resin, and stone.

[0098] The cured product of the curable composition has excellent matte finish and textured feel, and the change in color tone before and after curing is reduced, so that the design of the wall member is not impaired, and together with the wall member, a wall section with excellent design can be formed.

[0099] Furthermore, the cured product of the curable composition has excellent antibacterial properties, and therefore can fully meet recent demands for cleanliness. Furthermore, even when the wall is washed with a detergent, the color will not be affected by the detergent and the excellent design of the wall can be maintained for a long period of time. [Effects of the Invention]

[0100] The curable composition of the present invention produces a cured product that has excellent antibacterial properties, detergent resistance during cleaning, and excellent matte finish and textured feel, and the change in color tone before and after curing is reduced, so that the design and antibacterial properties of other components that are used together with the curable composition are not impaired. DETAILED DESCRIPTION OF THE INVENTION

[0101] The following examples will further illustrate aspects of the present invention, but the present invention is not limited to these examples. [Example]

[0102] The following compounds were used in the preparation of the curable compositions of the Examples and Comparative Examples.

[0103] [Curable polymer (A)] Polyoxyalkylene polymer (A1) having a hydrolyzable silyl group (Polyoxyalkylene polymer (A1), number average molecular weight: 18,000, molecular weight distribution: 1.40, main chain: -[CH(CH3)-CH2-O]n-, manufactured by Asahi Glass Co., Ltd., product name "Excestar 3430") Polyoxyalkylene polymer (A2) having a hydrolyzable silyl group (Polyoxyalkylene polymer (A2), number average molecular weight: 30,000, molecular weight distribution: 1.60, main chain: -[CH(CH3)-CH2-O]n-, manufactured by Wacker Asahi Kasei Silicones Co., Ltd., trade name "GENIOSIL STP-E35")

[0104] [Amine compound (B)] Monoamine compound (B1) (stearylamine, melting point: 50°C, manufactured by Kao Corporation, product name "Fa Min 80S Monoamine compound (B2) (laurylamine, melting point: 28°C, product name "Nissan Amine BB" manufactured by NOF Corporation) Monoamine compound (B3) (behenylamine, melting point: 63°C, NOF Corporation, trade name "Nissanamine VB-S")

[0105] [Particle (C)] Particles (C1) (glass balloons, manufactured by Showa Chemical Industry Co., Ltd., product name "Hardlite B04", particle diameter: 46 to 600 μm, porosity: 30%) Particles (C2) (glass balloons, Potters Ballotini, product name "Q Cell 7040", particle size: 5-45 μm, porosity: 70%)

[0106] [Antibacterial Agents (D)] Metal-based antibacterial agent (metal-containing inorganic compound, metal atom content: 0.1 to 10% by mass, zeolite crystal structure: A-type, average particle size: 2.5 μm, manufactured by Sinanen Zeomic Co., Ltd., product name "Zeomic Ztype")

[0107] [Silane coupling agents] Aminosilane coupling agent [N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, product name "KBM-603" manufactured by Shin-Etsu Chemical Co., Ltd.]

[0108] [Pigment] Black pigment (Nippon Pigment Co., Ltd., carbon black)

[0109] [Silanol condensation catalyst] Dibutyltin oxylaurate (manufactured by Nitto Kasei Co., Ltd., product name "Neostan U-130")

[0110] (Examples 1 to 8, Comparative Examples 1 to 5) The curable polymer (A), amine compound (B), particles (C), metal-based antibacterial agent (D), aminosilane coupling agent, black pigment, and dibutyltin oxylaurate in the amounts shown in Table 1 were uniformly mixed under reduced pressure to prepare a curable composition.

[0111] Table 1 shows the volume concentration of particles (C) having a particle diameter of 5 to 1000 μm in the obtained curable composition.

[0112] The resulting curable composition was cured for one week in an environment with an atmospheric temperature of 23°C and a relative humidity of 50% to obtain a cured product.

[0113] The gloss of the resulting cured product was measured in the same manner as above, and the results are shown in Table 1.

[0114] The maximum height Pz (μm) of the irregularities formed on the surface of the obtained cured product was measured in the same manner as above, and the measurement results are shown in Table 1. The average thickness of the obtained cured product was 3000 μm.

[0115] The resulting cured product was measured for texture, color tone, antibacterial properties, and detergent resistance in the following manner. The results are shown in Table 1.

[0116] (Uneven feeling) The irregularities formed on the surface of the cured product of the curable composition were visually observed and evaluated according to the following criteria. A: Large irregularities were observed. B: Fine irregularities were observed. C: No irregularities were observed.

[0117] (color tone) The color tone of the surface of the curable composition before curing and the color tone of the surface of the cured product obtained by curing the curable composition were measured using a spectrophotometer (Konica Minolta, Inc., product name "CM-5," ​​measurement method: SCE method, field of view: 10 degrees, light source: D65). Then, the color difference (ΔL: difference in lightness) of the cured product surface after curing was calculated using the color tone of the curable composition surface before curing as the reference color. Note that a larger ΔL value indicates a whitish surface of the cured product compared to the reference color, and a smaller ΔL value indicates a darker surface of the cured product compared to the reference color. The ΔL value is preferably -2.0 or more and +2.0 or less.

[0118] (Antibacterial) The antibacterial properties of the cured product of the curable composition were observed in accordance with the antibacterial properties test method for antibacterial processed products specified in JIS Z 2801, and evaluated based on the following criteria. A: The logarithm of the viable cell count was −0.2 or less. B: The logarithm of the viable cell count was greater than -0.2 and less than 0.5. C: The absolute value of the viable cell count was 0.5 or higher.

[0119] (detergent resistance) 0.2 mL of chlorine bleach was dropped onto the cured product of the curable composition, and the product was covered with glass and left to stand for 24 hours. After that, the chlorine bleach was thoroughly washed off with running water. Thereafter, the surface of the cured product was observed with an optical microscope and visually, and evaluated based on the following criteria. A: No color change on the surface of the cured product was observed either visually or under an optical microscope. B: No color change was observed on the surface of the cured product with the naked eye, but was observed with an optical microscope. C...Color changes on the surface of the cured material were observed both visually and with an optical microscope.

[0120] If no color change on the surface of the cured product is observed both visually and under an optical microscope (criterion A above), the surface of the cured product can still maintain a state where no color change occurs even after a long period of time, such as several months or more, has passed since the chlorine bleach was washed away, and the product can be evaluated as having particularly excellent detergent resistance.

[0121] [Table 1]

Claims

1. The composition comprises 100 parts by mass of a curable polymer, 2 parts by mass or less of an amine compound having a melting point of 25 to 80°C, particles having a particle size of 5 to 1000 μm, and an antibacterial agent, the curable polymer has only hydrolyzable silyl groups as crosslinkable reactive groups in the molecule, The curable composition is characterized in that the antibacterial agent is a metal-based antibacterial agent in which a metal atom is contained in an inorganic compound, and the antibacterial agent has an average particle size of 0.1 to 11 μm.

2. 2. The curable composition according to claim 1, wherein the gloss of the cured product is 15 or less.

3. 3. The curable composition according to claim 1, wherein the curable polymer has a polyoxyalkylene structure.

4. 3. The curable composition according to claim 1, wherein the volume concentration of the particles having a particle diameter of 5 to 1000 μm is 10% by volume or less.

5. 3. The curable composition according to claim 1, wherein the particles having a particle diameter of 5 to 1000 μm have a porosity of 20 to 80%.

6. 3. The curable composition according to claim 1, wherein the surface of the cured product has an uneven shape with a maximum height Pz of 100 μm or more.

Images