Actinic energy ray-curable composition and cured product thereof, and member

Abstract

To provide a novel actinic energy ray-curable composition that can be applied to interior members, water-related members, and the like, that can develop transparency and can produce a cured product having flexibility capable of enduring processing including winding and bending, a cured product thereof, and a member provided with the cured product.SOLUTION: An actinic energy ray-curable composition includes a curable component and a photopolymerization initiator, wherein the curable component includes: a component (A): a urethane (meth)acrylate having two or more functional groups; a component (B): a (meth)acrylate having two or more functional groups and having no urethane bond; a component (C): a hydroxyl group-containing (meth)acrylate having less than two functional groups; a component (D): an acid group-containing (meth)acrylate; and a component (E): a (meth)acrylate-modified sulfonate.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to an active energy ray-curable composition, a cured product thereof, and a member. [Background technology]

[0002] In the case of interior components, wet area components, and the like, a cured coating film made of an active energy ray-curable composition is provided on the surface to impart stain resistance, chemical resistance, easy cleaning properties, and the like to the components (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-71118 Summary of the Invention [Problem to be solved by the invention]

[0004] Among conventional active energy ray-curable compositions that can be applied to interior materials and wet area materials, there are no known compositions that can exhibit transparency and have flexibility that can withstand processing such as winding and bending.

[0005] An object of the present disclosure is to provide a novel active energy ray-curable composition that can be applied to interior components, wet area components, etc., and that can exhibit transparency and give a cured product that has flexibility sufficient to withstand processing such as winding and bending, as well as a cured product thereof, and a component comprising the cured product. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by an active energy ray-curable composition comprising a curable component and a photopolymerization initiator, wherein the curable component comprises: component (A): a difunctional or higher urethane (meth)acrylate; component (B): a difunctional or higher (meth)acrylate having no urethane bond; component (C): a less than difunctional hydroxyl group-containing (meth)acrylate; component (D): an acid group-containing (meth)acrylate; and component (E): a (meth)acrylic-modified sulfonate. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a novel active energy ray-curable composition that can be applied to interior components, wet area components, etc., and that can exhibit transparency and give a cured product that has flexibility sufficient to withstand processing such as winding and bending, as well as a cured product thereof, and a component including the cured product. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present disclosure will be described in detail below. However, the scope of the present disclosure is not limited to the embodiment described herein, and various modifications can be made without departing from the spirit of the present disclosure. Each aspect disclosed in this specification can be combined with any other feature disclosed in this specification. Furthermore, when multiple upper and lower limit values ​​are described for a particular parameter, any of these upper and lower limit values ​​can be combined to form a suitable numerical range. Furthermore, the lower and / or upper limit values ​​of a numerical range described in this disclosure are numerical values ​​within that numerical range and may be replaced with numerical values ​​shown in the examples. The expression "X to Y" indicating a numerical range means "X or more and Y or less." Furthermore, unless otherwise noted, all test temperatures were room temperature (20°C ± 5°C). When a particular description given for one embodiment is applicable to other embodiments, that description may be omitted in the other embodiments.

[0009] The configurations and combinations thereof in each embodiment are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible as appropriate within the scope of the gist of this disclosure. The present disclosure is not limited to the embodiments, but is limited only by the claims. Each feature disclosed herein may be combined with any other feature disclosed herein.

[0010] [Active energy ray-curable composition] A first embodiment of the present disclosure relates to an active energy ray-curable composition. The active energy ray-curable composition according to the first embodiment includes a curable component and a photopolymerization initiator, and the curable component includes: (A) component: a difunctional or higher urethane (meth)acrylate; (B) component: a difunctional or higher (meth)acrylate having no urethane bond; (C) component: a less than difunctional hydroxyl group-containing (meth)acrylate; (D) component: an acid group-containing (meth)acrylate; and (E) component: a (meth)acrylic-modified sulfonate. The active energy ray-curable composition according to the first embodiment (hereinafter referred to as "curable composition") can provide a cured product that exhibits transparency and has flexibility sufficient to withstand processing such as winding and bending.

[0011] In the present disclosure, the term "active energy ray-curable composition" refers to a composition in which the curing reaction is accelerated by irradiation with active energy rays such as ultraviolet rays and electron beams. The term "functional group" refers to a functional group that undergoes a curing reaction (e.g., a polymerization reaction) upon irradiation with active energy rays. In the present disclosure, the term "functional group" refers to a (meth)acryloyl group. The term "number of functional groups" refers to the number (which may be the average value) of (meth)acryloyl groups contained in one molecule, and the term "average number of functional groups" refers to the sum of the values ​​obtained by multiplying the number of functional groups possessed by the (meth)acrylate contained in each component by the mass proportion. When commercially available products are used as various components, the "average number of functional groups" listed on the product data sheet is used as the "number of functional groups." In this disclosure, (meth)acrylate includes both acrylate and methacrylate monomers.

[0012] <Curing component> The curable composition according to the first embodiment contains, as curable components, component (A): a difunctional or higher urethane (meth)acrylate, component (B): a difunctional or higher (meth)acrylate having no urethane bond, component (C): a less than difunctional hydroxyl group-containing (meth)acrylate, component (D): an acid group-containing (meth)acrylate, and component (E): a (meth)acrylic-modified sulfonate.

[0013] (Component (A)) Component (A) is a difunctional or higher urethane (meth)acrylate. By including component (A) in the curable component, the resulting cured product can have flexibility that allows it to withstand processing such as winding and bending. In one embodiment, the number of functional groups in component (A) is preferably 2 to 10, and more preferably 2 to 4. The component (A) can be obtained by reacting a hydroxy(meth)acrylate compound with a polyisocyanate compound by a known method. The component (A) may be used alone or in combination of two or more types.

[0014] Hydroxy(meth)acrylate compounds Suitable hydroxy(meth)acrylate compounds include known (meth)acrylic acid esters having a hydroxy group in the ester moiety. Examples include hydroxyalkyl(meth)acrylates such as 2-hydroxyethyl(meth)acrylate, 2-hydroxypropyl(meth)acrylate, 2-hydroxybutyl(meth)acrylate, 3-hydroxybutyl(meth)acrylate, and 4-hydroxybutyl(meth)acrylate; poly(alkylene glycol) mono(meth)acrylates such as poly(ethylene glycol) mono(meth)acrylate and poly(propylene glycol) mono(meth)acrylate; polyfunctional (meth)acrylates such as pentaerythritol tri(meth)acrylate; and ring-opening reaction products of these with ε-caprolactone. These hydroxy(meth)acrylate compounds may be used alone or in combination.

[0015] Polyisocyanate compounds Examples of polyisocyanate compounds include aromatic diisocyanate compounds such as 2,6-toluene diisocyanate, 1,3-xylene diisocyanate, tetramethylxylene diisocyanate, diphenylmethane-4,4-diisocyanate, 3-methyl-diphenylmethane diisocyanate, and 1,5-naphthalene diisocyanate; alicyclic diisocyanate compounds such as dicyclohexylmethane diisocyanate and isophorone diisocyanate; and aliphatic diisocyanate compounds such as hexamethylene diisocyanate and lysine diisocyanate. One type of polyisocyanate compound may be used alone, or two or more types may be used in combination.

[0016] Polyol compounds In preparing component (A), the above-mentioned hydroxy(meth)acrylate compound, the above-mentioned polyisocyanate compound, and a polyol compound can also be used in combination. Examples of the polyol compound that can be used include low-molecular-weight polyols, polyether polyols, polyester polyols, alkylene polyols, and polycarbonate polyols. The polyol compounds may be used alone or in combination of two or more.

[0017] Examples of low-molecular-weight polyols include polyols having two or more hydroxyl groups and an atomic weight-equivalent molecular weight (g / mol) of about 50 to 300. Specific examples include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, cyclohexanedimethanol, tricyclodecanedimethanol, neopentyl glycol, 3-methyl-1,5-pentanediol, and neopentyl glycol hydroxypivalate.

[0018] Examples of polyether polyols include polyalkylene glycols having three or more oxyalkylene units, such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol.

[0019] Examples of polycarbonate polyols include reaction products of carbonates and diols. Examples of carbonates include diaryl carbonates such as diphenyl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; and examples of diols include the low-molecular-weight polyols listed above.

[0020] Examples of polyester polyols include esterification reaction products of one or more components selected from the above-mentioned low-molecular-weight polyols, polyether polyols, and polycarbonate polyols with dicarboxylic acids. As the dicarboxylic acid, various compounds can be used, such as adipic acid, sebacic acid, succinic acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, maleic acid, maleic anhydride, itaconic acid, and dimer acid.

[0021] In one embodiment, the component (A) may be obtained by reacting an isocyanate group-containing (meth)acrylate such as 2-methacryloyloxyethyl isocyanate, 2-acryloyloxyethyl isocyanate, or 1,1-bis(acryloyloxymethyl)ethyl isocyanate with the polyol compound and / or the hydroxy(meth)acrylate compound by a known method.

[0022] In one embodiment, component (A) may have an allophanate bond.

[0023] In a preferred embodiment, component (A) preferably contains at least a difunctional or higher aliphatic urethane (meth)acrylate obtained by reacting a hydroxy(meth)acrylate compound with an aliphatic diisocyanate compound, and more preferably contains a difunctional or higher aliphatic urethane acrylate. When component (A) contains a difunctional or higher aliphatic urethane (meth)acrylate, transparency and flexibility tend to be improved. In a further preferred embodiment, component (A) contains a di- to tetrafunctional aliphatic urethane (meth)acrylate. Commercially available products may be used as such difunctional or higher aliphatic urethane (meth)acrylates. Commercially available products include, for example, the KRM series (e.g., product name "KRM8191") and the EBECRYL (registered trademark) series (e.g., product names "EBECRYL 8402," "EBECRYL 9270," and "EBECRYL 8807" (all bifunctional), "EBECRYL 8465," "EBECRYL 9260," and "EBECRYL 8701" (all trifunctional), and "EBECRYL 4201" (tetrafunctional), manufactured by Daicel-Allnex Co., Ltd. A particularly preferred embodiment is one in which component (A) contains only a difunctional aliphatic urethane (meth)acrylate, a trifunctional aliphatic urethane (meth)acrylate, or a tetrafunctional aliphatic urethane (meth)acrylate.

[0024] In one embodiment, from the viewpoint of compatibility with the other curable components (components (B) to (E)) in the curable composition, the weight average molecular weight (Mw) of the component (A) is preferably 10,000 or less, more preferably 200 to 8,000, even more preferably 500 to 6,000, and particularly preferably 700 to 4,500. In one embodiment, the Mw may be in the range of 200 to 3,000 or 200 to 2,500. The Mw is a value measured by gel permeation chromatography (GPC) in terms of polystyrene.

[0025] In one embodiment, when component (A) is a mixture of two or more types of urethane (meth)acrylate, the average number of functional groups of component (A) is preferably 2 to 10, and more preferably 2 to 4. When the average number of functional groups of component (A) is 2 to 10, flexibility tends to be good. For example, when component (A) contains 80 mass% of bifunctional urethane (meth)acrylate and 20 mass% of trifunctional urethane (meth)acrylate, relative to the total mass of component (A), the average number of functional groups of component (A) can be calculated as (2 × 0.8 + 3 × 0.2) = 2.2 (average number of functional groups) (the average number of functional groups of other components can also be calculated in the same manner as above).

[0026] In one embodiment, the proportion of component (A) in the curable components is preferably 5 to 60 mass%, more preferably 5 to 50 mass%, even more preferably 5 to 40 mass%, and particularly preferably 10 to 40 mass%, relative to the total mass of the curable components. When the proportion of component (A) in the curable components is within the above range, it becomes easier to obtain a cured product that can exhibit transparency and has flexibility sufficient to withstand processing such as winding and bending.

[0027] In one embodiment, when the component (A) is a difunctional urethane (meth)acrylate (preferably a difunctional aliphatic urethane (meth)acrylate), the proportion of the component (A) in the curable component is preferably 5 to 40 mass %, more preferably 10 to 40 mass %. In one embodiment, when the component (A) is a trifunctional or tetrafunctional urethane (meth)acrylate (preferably a trifunctional or tetrafunctional aliphatic urethane (meth)acrylate), the proportion of the component (A) in the curable component is preferably 5 to 30 mass%, more preferably 5 to 25 mass%.

[0028] ((B) component) Component (B) is a (meth)acrylate that does not have a di- or higher functional urethane bond, and component (B) does not include component (D). In one embodiment, the component (B) may be a (meth)acrylate having 2 to 6 functional groups and no urethane bond, a (meth)acrylate having 2 to 5 functional groups and no urethane bond, or a (meth)acrylate having 2 to 4 functional groups and no urethane bond.

[0029] In one embodiment, the molecular weight (g / mol) of the component (B) is preferably 100 to 600, more preferably 150 to 600, even more preferably 150 to 500, and particularly preferably 150 to 400, in terms of atomic weight.

[0030] Among the (B) components having the above molecular weight, preferred examples of the bifunctional (meth)acrylate not having a urethane bond include diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 4,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, pentaerythritol di(meth)acrylate, neopentyl glycol dimethacrylate, 3-methyl-1,5-pentanediol diacrylate, 2-hydroxy-3-acryloyloxypropyl methacrylate, dimethylol tricyclodecane diacrylate, dicyclopentanyl diacrylate, etc. These may be used alone or in combination of two or more.

[0031] Preferred examples of trifunctional (meth)acrylates having the above molecular weight and no urethane bond include trimethylolpropane tri(meth)acrylate, ethylene oxide-modified trimethylolpropane tri(meth)acrylate, ethoxylated glycerin tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propylene oxide-modified trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, alkyl-modified dipentaerythritol tri(meth)acrylate, tris(2-acryloxyethyl)isocyanurate, ε-caprolactone-modified tris(2-acryloxyethyl)isocyanurate, etc. These may be used alone or in combination of two or more.

[0032] Preferred examples of tetrafunctional (meth)acrylates having the above molecular weight and no urethane bond include trimethylolpropane tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, ethoxylated pentaerythritol tetra(meth)acrylate, alkyl-modified dipentaerythritol tetra(meth)acrylate, etc. These may be used alone or in combination of two or more.

[0033] Preferred examples of the pentafunctional (meth)acrylate having the above molecular weight and no urethane bond include dipentaerythritol penta(meth)acrylate, alkyl-modified dipentaerythritol penta(meth)acrylate, etc. These may be used alone or in combination of two or more.

[0034] Preferred examples of the hexafunctional (meth)acrylate having the above molecular weight and not having a urethane bond include dipentaerythritol hexa(meth)acrylate, caprolactone-modified dipentaerythritol hexa(meth)acrylate, etc. These may be used alone or in combination of two or more.

[0035] In one embodiment, from the viewpoint of the finished appearance of the cured coating film, component (B) may contain a hydroxyl group-containing (meth)acrylate that is di- or higher functional and does not have a urethane bond. The number of hydroxyl groups in the di- or higher functional hydroxyl group-containing (meth)acrylate that does not have a urethane bond is not particularly limited, and may be 1 to 10 or 1 to 5. Preferred examples of the di- or higher functional hydroxyl group-containing (meth)acrylate that does not have a urethane bond include those exemplified as the di- to hexa-functional (meth)acrylates above, such as di-functional ethylene oxide isocyanuric acid modified di(meth)acrylate and glycerol epichlorohydrin modified 1,6-hexanediol di(meth)acrylate, and other di-functional hydroxyl group-containing (meth)acrylate compounds that do not have a urethane bond; and tri- or higher functional hydroxyl group-containing (meth)acrylate compounds that do not have a urethane bond, such as pentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, caprolactone-modified dipentaerythritol penta(meth)acrylate, caprolactone-modified pentaerythritol tri(meth)acrylate, ethylene oxide-modified dipentaerythritol penta(meth)acrylate, and ethylene oxide-modified pentaerythritol tri(meth)acrylate. These may be used alone or in combination of two or more. Among these, when component (B) contains a difunctional or higher hydroxyl group-containing (meth)acrylate that does not have a urethane bond, it is preferably pentaerythritol tetraacrylate, pentaerythritol triacrylate, or a mixture thereof, and more preferably a mixture of pentaerythritol tetraacrylate and pentaerythritol triacrylate.

[0036] When the component (B) contains a di- or higher functional hydroxyl group-containing (meth)acrylate that does not have a urethane bond, the content is preferably 10 to 60 mass %, more preferably 30 to 50 mass %, based on the total mass of the component (B).

[0037] In one embodiment, component (B) preferably contains the above-mentioned difunctional or higher functional hydroxyl group-containing (meth)acrylate that does not have a urethane bond and / or other difunctional or higher functional (meth)acrylate that does not have a urethane bond. In a more preferred embodiment, component (B) is one or more difunctional or higher functional (meth)acrylates selected from the group consisting of pentaerythritol tetraacrylate, pentaerythritol triacrylate, dimethylol tricyclodecane diacrylate, and ethoxylated trimethylolpropane triacrylate. By containing such a (meth)acrylate, compatibility and reactivity with other components in the composition tend to be good.

[0038] When component (B) is a mixture of two or more types of (meth)acrylates that do not have a urethane bond, the average number of functional groups in component (B) may be 2 to 6, 2 to 5, 2 to 4, or 2.5 to 3.5. When the average number of functional groups in component (B) is within the above range, the transparency of the cured product tends to be better. Furthermore, when the curable composition according to the first embodiment is used as a cured coating film for interior components or wet area components, the finished appearance of the coating film tends to be improved.

[0039] In one embodiment, the proportion of component (B) in the curable components is preferably 20 to 70 mass %, more preferably 30 to 60 mass %, and even more preferably 35 to 55 mass %, relative to the total mass of the curable components. When the proportion of component (B) is within this range, the haze value of the cured product tends to be small, and good transparency tends to be exhibited.

[0040] In one embodiment, the curable component preferably contains component (A) and component (B) as the main components. The term "main components" refers to a content of more than 50% by mass of the total curable component. The combined amount of component (A) and component (B) is preferably more than 50% by mass and not more than 85% by mass, more preferably 60% by mass or more and not more than 80% by mass, and even more preferably 60% by mass or more and not more than 75% by mass. The mass ratio of component (A) to component (B) ((A):(B)) in the curable component is more preferably in the range of 1:1 to 1:5.

[0041] ((C) component) Component (C) is a less than difunctional hydroxyl group-containing (meth)acrylate. Combining components (A) and (B) with component (C) results in a cured product with transparency and flexibility, and also improves the hydrophilicity of the surface of the cured product. The number of hydroxyl groups in component (C) is not particularly limited and may be 1 to 10, or 1 to 5. The number of functional groups in component (C) is preferably 1 or more and less than 2. In a preferred embodiment, component (C) is a monofunctional hydroxyl group-containing (meth)acrylate.

[0042] The presence or absence of a urethane bond in component (C) is not particularly limited, but a monofunctional hydroxyl group-containing (meth)acrylate without a urethane bond is preferred. Examples of such (meth)acrylates include epoxy acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxy-3-methoxypropyl (meth)acrylate, 1,4-cyclohexanedimethanol mono(meth)acrylate, caprolactone-modified 2-hydroxyethyl (meth)acrylate, polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, and bisphenol A diglycidyl mono(meth)acrylate, as well as hydrogenated versions thereof. These may be used alone or in combination of two or more. From the viewpoint of compatibility with other components, component (C) preferably contains one or more selected from the group consisting of hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate, and mixtures thereof.

[0043] In one embodiment, the proportion of the component (C) in the curable components is preferably 5 to 40 mass %, more preferably 10 to 40 mass %, and even more preferably 10 to 30 mass %, relative to the total mass of the curable components.

[0044] In one embodiment, the proportion of the (C) component relative to 100 parts by mass of the total of the (A) component and the (B) component may be 5 to 30 parts by mass, 5 to 25 parts by mass, or 10 to 25 parts by mass.

[0045] ((D) component) The component (D) is an acid group-containing (meth)acrylate. The inclusion of the component (D) improves compatibility with other components in the composition and improves the transparency of the cured coating film. Note that the curable composition according to the first embodiment does not include a component (D) in which the acid-modified moiety is in the form of a salt.

[0046] In one embodiment, the component (D) is preferably a monofunctional acid group-containing (meth)acrylate. In one embodiment, the acid value (mgKOH / g) of the component (D) is preferably 80 to 800, more preferably 200 to 500, and particularly preferably 250 to 400.

[0047] Examples of the component (D) include carboxylic acid-modified (meth)acrylates, phosphoric acid-modified (meth)acrylates, polybasic acid (succinic acid, phthalic acid, etc.)-modified (meth)acrylates, and sulfonic acid-modified (meth)acrylates. These may be used alone or in combination of two or more. In one embodiment, the component (B) is preferably an acid group-containing (meth)acrylate in which the acid component is one or more selected from carboxylic acid, phosphoric acid, and succinic acid, more preferably one or more selected from β-carboxyethyl acrylate, phosphoric acid-modified methacrylate, phosphoric acid-modified acrylate, and 2-acryloyloxyethyl succinic acid, and more preferably contains β-carboxyethyl acrylate.

[0048] In one embodiment, the proportion of the component (D) in the curable components is preferably 1 to 20 mass %, more preferably 1 to 15 mass %, and even more preferably 5 to 15 mass %, relative to the total mass of the curable components. In one embodiment, the proportion of the (D) component relative to 100 parts by mass of the total of the (A) and (B) components is preferably 1 to 15 parts by mass, more preferably 5 to 15 parts by mass, and even more preferably 7.5 to 12.5 parts by mass.

[0049] ((E) component) The component (E) is a (meth)acrylic-modified sulfonate. In the curable composition according to the first embodiment, the acid-modified portion of the component (E) is in the form of a salt. When the curable component contains the component (E), the hydrophilicity of the cured product can be improved. Examples of component (E) include sodium or potassium salts of 3-sulfopropyl potassium acrylate, 3-sulfopropyl potassium methacrylate, 2-((meth)acryloyloxy)ethanesulfonic acid, 3-((meth)acryloyloxy)propane-1-sulfonic acid, and acrylamido-t-butylsulfonic acid. These may be used alone or in combination of two or more. Of these, component (E) is more preferably one or more (meth)acrylic-modified sulfonates selected from the group consisting of 3-sulfopropyl potassium acrylate, 3-sulfopropyl potassium methacrylate, and mixtures thereof.

[0050] In one embodiment, the proportion of the component (E) in the curable components is preferably 0.01 to 5 mass %, more preferably 0.1 to 5 mass %, and even more preferably 0.1 to 3 mass %, relative to the total mass of the curable components. In one embodiment, the proportion of the component (E) relative to 100 parts by mass of the total of the components (A) and (B) is preferably 0.1 to 3 parts by mass, more preferably 0.2 to 2.5 parts by mass, and particularly preferably 0.5 to 1.5 parts by mass.

[0051] (Other ingredients) In one embodiment, the curable component may contain any curable component (other component) other than the above components (A) to (E). Examples of other components include monofunctional (meth)acrylates not having a urethane bond, such as methyl (meth)acrylate, ethyl (meth)acrylate, glycidyl (meth)acrylate, dicyclopentenyl (meth)acrylate, n-butyl (meth)acrylate, β-carboxyethyl (meth)acrylate, isobornyl (meth)acrylate, octyl / decyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, isodecyl (meth)acrylate, n-lauryl (meth)acrylate, n-stearyl (meth)acrylate, and cyclohexyl (meth)acrylate; and monofunctional urethane (meth)acrylates. These may be used alone or in combination of two or more. From the viewpoint of easily obtaining a cured product that exhibits the effects of the present disclosure, it is preferable that the curable component contains only components (A) to (E).

[0052] In one embodiment, the average number of functional groups in all of the curable components is preferably 1 to 3, and more preferably 1.5 to 2.5. By adjusting the numbers of functional groups and the blending ratios of components (A) to (E) so that the average number of functional groups in all of the curable components falls within the above range, a cured product that exhibits the effects of the present disclosure can be more easily obtained.

[0053] <Photopolymerization initiator> The curable composition according to the first embodiment contains the above-described curable component and a photopolymerization initiator. Examples of the photopolymerization initiator include benzophenone, acetophenone benzyl, benzyl dimethyl ketone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, dimethoxyacetophenone, dimethoxyphenylacetophenone, diethoxyacetophenone, diphenyl disulfite, methyl orthobenzoylbenzoate, ethyl 4-dimethylaminobenzoate (e.g., manufactured by Nippon Kayaku Co., Ltd., product name "KAYACURE (registered trademark) EPA"), 2,4-diethylthioxanthone (e.g., manufactured by Nippon Kayaku Co., Ltd., product name "KAYACURE DETX"), 2-methyl-1-[4-(methyl)phenyl]-2-morpholinopropanone-1 (e.g., manufactured by Ciba-Geigy Co., Ltd., product name "Irgacure (registered trademark) 907"), 1-hydroxycyclohexyl phenyl ketone (e.g., manufactured by IGM Resins BV, product name "Omnirad 184), 2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropionyl)benzyl)phenyl)-2-methylpropan-1-one (for example, IGM Resins BV, product name "Omnirad 127", etc.), 2-amino-2-benzoyl-1-phenylalkane compounds such as 2-dimethylamino-2-(4-morpholino)benzoyl-1-phenylpropane, aminobenzene derivatives such as tetra(t-butylperoxycarbonyl)benzophenone, benzyl, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 4,4'-bis(diethylamino)benzophenone, 2,2'-bis(2-chlorophenyl)-4,5,4',5' Examples of suitable photosensitizers include imidazole compounds such as 1,2'-tetraphenyl-biimidazole (e.g., Hodogaya Chemical Co., Ltd., product name "B-CIM"), halomethylated triazine compounds such as 2,6-bis(trichloromethyl)-4-(4-methoxynaphthalen-1-yl)-1,3,5-triazine, and halomethyloxadiazole compounds such as 2-trichloromethyl-5-(2-benzofuran-2-yl-ethenyl)-1,3,4-oxadiazole. These may be used alone or in combination of two or more. If necessary, a photosensitizer may be added.

[0054] In one embodiment, the content of the photopolymerization initiator in the curable composition is preferably 1 to 5 mass %, more preferably 2.5 to 5 mass %, and even more preferably 4 to 5 mass %, relative to the total mass of the curable composition. When the content of the photopolymerization initiator is within the above range, the curable composition according to the first embodiment can be appropriately cured by irradiation with active energy rays, which will be described later.

[0055] (Other additives) The curable composition according to this embodiment may contain any component (other additives) other than the curable component and the photopolymerization initiator. The other additives are not particularly limited, and any additive that can be incorporated into an active energy ray-curable composition and / or a thermophotocurable composition may be incorporated. For example, a radical polymerization initiator other than the photopolymerization initiator, an ultraviolet absorber, a reaction accelerator, a light stabilizer, a surface conditioner, etc. may be incorporated.

[0056] UV absorber Any known or commonly used ultraviolet absorber can be used as the ultraviolet absorber, and is not particularly limited. Examples of the ultraviolet absorber include cyanoacrylate-based, dihydroxybenzophenone-based, benzotriazole-based, triazine-based, and benzophenone-based ultraviolet absorbers.

[0057] Examples of cyanoacrylate ultraviolet absorbers include 2-ethylhexyl-2-cyano-3,3-diphenylacrylate and ethyl-2-cyano-3,3-diphenylacrylate.

[0058] Examples of dihydroxybenzophenone-based ultraviolet absorbers include 2-hydroxy-4-methoxybenzophenone, (2,4-dihydroxyphenyl)-phenylmethanone, hydroxymethoxybenzophenonesulfonic acid, 2-(2H-benzotriazol-2-yl)-4-methyl, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl), and 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methyl. Examples of benzotriazole-based ultraviolet absorbers include 2-(2H-benzotriazole-2-yl)-p-cresol, 2-(5-chloro-2H-benzotriazole-2-yl)-6-tertiarybutyl-4-methylphenol, and 2,2'-methylenebis[6-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol].

[0059] Examples of triazine-based ultraviolet absorbers include 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[2-(2-ethylhexanoloxy)ethoxy]phenol, 2-(4-((2-hydroxy-3-dodecyloxypropyl)oxy)-2-hydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, and 2-(4-((2-hydroxy-3-tridecyloxypropyl)oxy)-2-hydroxyphenyl)-4,6-bis (2,4-dimethylphenyl)-1,3,5-triazine, 2-(4-((2-hydroxy-3-(2'ethyl)hexyl)oxy)-2-hydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2,4-bis(2-hydroxy-4-butyloxyphenyl)-6-(2,4-bisbutyloxyphenyl)-1,3,5-triazine, 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxy, and the like.

[0060] An example of a benzophenone-based ultraviolet absorber is [2-hydroxy-4-(octyloxy)phenyl]phenylmethanone. The ultraviolet absorbers may be used alone or in combination of two or more.

[0061] Light stabilizers The light stabilizer may be any known or conventional one, and is not particularly limited. Examples of the light stabilizer include 2,2,6,6-tetraalkyl-4-piperidyl esters (e.g., 2,2,6,6-tetramethyl-4-piperidyl esters), 4-alkoxy-2,2,6,6-tetraalkylpiperidines (e.g., 4-(C1-10 alkoxy)-2,2,6,6-piperidines such as 4-methoxy-2,2,6,6-tetramethylpiperidine; 4-(C6-10 aryloxy)-2,2,6,6-piperidines such as 4-phenoxy-2,2,6,6-tetramethylpiperidine; 4-(C6-10 aryl)-(C1-4 alkyl)-2,2,6,6-tetramethylpiperidines such as 4-benzyloxy-2,2,6,6-tetramethylpiperidine), bis( 2,2,6,6-tetraalkyl-4-piperidyloxy)alkanes [for example, bis(2,2,6,6-tetramethyl-4-piperidyloxy)(C2-6 alkanes) such as 1,2-bis(2,2,6,6-tetramethyl-4-piperidyloxy)ethane], tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)butane-1,2,3,4-tetracarboxylate; bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate; reaction products of 1,2,3,4-butanetetracarboxylic acid tetramethyl ester with 1,2,2,6,6-pentamethyl-4-piperidinol and β,β,β',β'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol, and the like. The light stabilizers may be used alone or in combination of two or more.

[0062] Reaction accelerator The reaction accelerator may be any known or conventional one, and is not particularly limited. Examples of the accelerator include 1,8-diazabicyclo[5.4.0]undecene-7 (DBU) or a salt thereof (e.g., phenol salt, octylate salt, p-toluenesulfonate, formate salt, tetraphenylborate salt, etc.); 1,5-diazabicyclo[4.3.0]nonene-5 (DBN) or a salt thereof (e.g., phenol salt, octylate salt, p-toluenesulfonate, formate salt, tetraphenylborate salt, etc.); benzyldimethylamine, 2,4,6-tris(dimethylamine), Examples of the reaction accelerator include tertiary amines such as 2-ethyl-4-methylimidazole and 1-cyanoethyl-2-ethyl-4-methylimidazole; phosphate esters; phosphines such as triphenylphosphine and tris(dimethoxy)phosphine; phosphonium compounds such as tetraphenylphosphonium tetra(p-tolyl)borate; organic metal salts such as zinc octoate, tin octoate, and zinc stearate; and metal chelates such as aluminum acetylacetone complex. The reaction accelerator may be used alone or in combination of two or more.

[0063] As described above, the curable composition according to the first embodiment contains components (A) to (E) as curable components. Conventional curable compositions used in interior components and wet-related components typically incorporate a fluorine component or silicone component into a resin component such as a polyfunctional (meth)acrylate to impart water repellency or stain resistance to the cured product, or a surfactant to hydrophilize the cured product. The inventors of the present application have found that adding a fluorine component or silicone component simultaneously imparts slipperiness, resulting in poor slip resistance. Furthermore, hydrophilization using a surfactant can lead to problems such as bleed-out of the surfactant after curing, or the cured product exhibits water absorption, resulting in poor chemical resistance. To address these issues, for example, Japanese Patent No. 6331217 and Japanese Patent No. 5108429 combine a (meth)acrylic-modified sulfonate with a resin component to improve physical properties such as stain resistance, chemical resistance, and slip resistance. However, it was found that this method results in poor appearance of the cured product due to the low compatibility between the resin component and the sulfonate salt, and furthermore, the high crosslinking density makes the cured product prone to cracking. To address these issues, the inventors of the present application discovered that combining the above-mentioned components (A) to (E) improves the poor appearance of the cured product and produces a cured product that exhibits transparency in particular. Furthermore, it was also found that the inclusion of these components imparts flexibility to the cured product, facilitating processing such as winding and bending. It is believed that this effect is achieved because combining a (meth)acrylate having a urethane bond (component (A)) with components (B) to (E) facilitates imparting flexibility (flexibility) to the cured product based on intermolecular chemical bonds, making it easier to exhibit toughness, particularly against deformation such as winding and bending. Furthermore, blending appropriate amounts of components (A) to (E) also facilitates improved compatibility between the components, reducing the haze value of the cured product and facilitating transparency. In this way, the curable composition according to the first embodiment, which can achieve both flexibility and transparency, is easy to process and can be applied to, for example, substrates with designs used in interior components and wet area components.

[0064] <Method for producing curable composition> The curable composition according to the first embodiment can be produced by mixing the curable component, the photopolymerization initiator, and, if necessary, the other additives and solvent described above. Because the curable composition according to the first embodiment has high compatibility between the resin components (components (A) and (B)) and the components (C) to (E), it is possible to reduce the amount of solvent used to dissolve the components (C) to (E) or to produce a composition without using any solvent. When using a solvent, it is preferable to use a hydrophilic solvent such as a lower alcohol or 2-methoxyethanol. Known or conventional mixing methods, such as various mixers such as dissolvers and homogenizers, kneaders, rolls, bead mills, and planetary stirrers, can be used. The mixing conditions, such as the temperature and rotation speed, are not particularly limited and can be set appropriately.

[0065] The curable composition according to the first embodiment can be cured by irradiating it with active energy rays to obtain a cured product that exhibits transparency and has flexibility that can withstand processing such as winding and bending. Such a curable composition can be suitably used, for example, as various components, particularly as interior components or wet-related components. It should be noted that the uses of the curable composition are naturally not limited to interior components and wet-related components.

[0066] [Cured product] The second embodiment of this embodiment is a cured product of the curable composition according to the first embodiment. The curable composition according to the first embodiment can be cured by irradiation with active energy rays. The cured product according to the second embodiment includes not only the curable composition described above in which the curing reaction is accelerated by irradiating the curable composition with active energy rays such as ultraviolet rays or electron beams, as described below, but also a completely cured product. Furthermore, the cured product of this embodiment also includes a "semi-cured product" obtained by irradiating the curable composition with active energy rays and curing it to the extent that it loses fluidity.

[0067] <Active energy rays> Examples of active energy rays include ultraviolet rays, electron beams, and ionizing radiation such as α-rays, β-rays, and γ-rays. When ultraviolet rays are used as active energy rays, examples of devices for irradiating the ultraviolet rays include low-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, electrodeless lamps (fusion lamps), chemical lamps, black light lamps, mercury-xenon lamps, short arc lamps, helium-cadmium lasers, argon lasers, sunlight, and LED lamps. The irradiation time of ultraviolet rays can be adjusted as desired between several seconds and several tens of seconds depending on the type of light source, the distance between the light source and the coated surface, and other conditions. On the other hand, in the case of electron beam irradiation, it is preferable to use an electron beam having an energy in the range of, for example, 50 to 1000 KeV, and to set the irradiation dose at 2 to 5 Mrad. Usually, an irradiation source with a lamp output of about 80 to 300 W / cm is used.

[0068] <Cured coating> The cured product according to the second embodiment can be obtained as a cured coating film, for example, by applying the curable composition according to the first embodiment to an object such as a substrate, and then curing the composition by irradiation with active energy rays.

[0069] The method for applying the curable composition to a substrate to obtain a cured coating film is not particularly limited, and any known method can be used, such as gravure coating, roll coating, reverse coating, knife coating, die coating, lip coating, doctor coating, extrusion coating, slide coating, wire bar coating, curtain coating, extrusion coating, or spin coating.

[0070] The thickness of the cured coating film is not particularly limited and can be adjusted as desired depending on the application, for example, within the range of 10 to 1000 μm, preferably 300 to 500 μm.

[0071] The object (subject to be coated) to which the curable composition is to be applied is not particularly limited in shape, material, etc., and examples of the material include resin, metal, glass, wood, paper, etc. Examples of resins include polyvinyl chloride, polypropylene, polyethylene, polyethylene terephthalate (PET), polycarbonate, acrylonitrile butadiene styrene (ABS), polypropylene sulfide, nylon-6, etc. Examples of metals include aluminum, SUS, iron, copper, etc. The substrate may be resin, glass, wood, paper, etc., whose surface has been subjected to metal deposition or release treatment.

[0072] In one embodiment, the haze value of a 10 μm thick cured coating film measured under the following conditions is preferably 1% or less, and more preferably 0.8% or less. <Haze value measurement conditions> The curable composition is applied to a PMMA film substrate (for example, Sumitomo Chemical Co., Ltd., product name "Technoloy (registered trademark) S104G" (thickness: 50 μm)) so that the film thickness after drying is 10 μm, and the coating is irradiated with active energy rays to form a cured coating film. The haze value of the resulting cured coating film is measured in accordance with JIS K 7136 using a haze meter (for example, Nippon Denshoku Industries Co., Ltd., product name "NDH 4000").

[0073] [Component] A third embodiment of the present disclosure is a member including the cured product according to the second embodiment. Such a member is not particularly limited, but is preferably an interior member or a wet area member. Details of the interior member and the wet area member as one aspect of the member will be described below.

[0074] <Interior materials> The "interior components" included in the components according to the third embodiment are all components that can be used in the manufacture of walls, floors, ceilings, etc., regardless of whether they are finishing materials that cover the surface of the interior or base materials that serve as a base for installing finishing materials. Non-limiting examples include flooring, tatami mats, wallpaper, tiles, plaster walls, structural plywood, etc.

[0075] <Water-related components> The "wet-related components" included in the components according to the third embodiment refer to all components that can be used in places where water or hot water is used, such as bathrooms, toilets, washrooms, swimming pools, etc. Non-limiting examples include ceilings, walls, sinks, hoses, pipes, valves, etc. in bathrooms, toilets, washrooms, swimming pools, etc.

[0076] A non-limiting list of exemplary embodiments and combinations of exemplary embodiments of the present disclosure are disclosed below. [1] A composition containing a curable component and a photopolymerization initiator, The curable component is (A) component: difunctional or higher urethane (meth)acrylate, (B) component: a (meth)acrylate having no difunctional or higher functional urethane bond; (C) component: a less than difunctional hydroxyl group-containing (meth)acrylate, (D) component: an acid group-containing (meth)acrylate, and (E) Component: (meth)acrylic-modified sulfonate, An active energy ray-curable composition comprising: [2] The active energy ray-curable composition according to [1], wherein the proportion of the component (A) relative to the total mass of the curable components is 5 to 60 mass %. [3] The active energy ray-curable composition according to [1] or [2], wherein the weight average molecular weight (Mw) of the component (A) is 10,000 or less. [4] The active energy ray-curable composition according to any one of [1] to [3], wherein the proportion of the component (B) relative to the total mass of the curable components is 20 to 70 mass %. [5] The active energy ray-curable composition according to any one of [1] to [4], wherein the component (A) contains a di- to tetra-functional aliphatic urethane (meth)acrylate. [6] The active energy ray-curable composition according to any one of [1] to [5], wherein the component (B) has an average of 2 to 6 functional groups. [7] A cured product of the active energy ray-curable composition according to any one of [1] to [6]. [8] A member comprising the cured product according to [7]. [9] The component according to [8], which is an interior component or a component for use in a water-related area. The configurations and combinations thereof in each embodiment are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible as appropriate within the scope that does not deviate from the gist of this disclosure. [Example]

[0077] The present embodiment will be described in more detail below by showing examples, but interpretation of the present disclosure is not limited to these examples.

[0078] [material] The materials used in the examples and comparative examples are as follows. <Component (A)> EBECRYL 8402: Difunctional aliphatic urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., Mw: 1,000, viscosity: 12,500 mPa·s / 25°C). EBECRYL 9270: Difunctional aliphatic urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., Mw: 1,000, viscosity: 7,500 mPa·s / 25°C). KRM8191: Difunctional aliphatic urethane acrylate (manufactured by Daicel Allnex Co., Ltd., Mw: 1,100, viscosity: 35,000 mPa·s / 25°C). EBECRYL 8807: Difunctional aliphatic urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., Mw: 1,000, viscosity: 8,000 mPa·s / 60°C). EBECRYL 8465: Trifunctional aliphatic urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., Mw: 1,400, viscosity: 2,100 mPa·s / 60°C). EBECRYL 9260: Trifunctional aliphatic urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., Mw: 1,500, viscosity: 62,000 mPa·s / 25°C). EBECRYL 8701: Trifunctional aliphatic urethane acrylate (manufactured by Daicel Allnex Co., Ltd., Mw: 2,000, viscosity: 4500 mPa·s / 60°C) EBECRYL 4201: tetrafunctional aliphatic urethane acrylate (manufactured by Daicel Allnex Co., Ltd., Mw: 2,000, viscosity: 8,000 mPa·s / 23°C) The number of functional groups, Mw, and viscosity of component (A) were determined from the catalog values ​​of each product.

[0079] <(B) component> PETRA: A mixture of pentaerythritol tetraacrylate and pentaerythritol triacrylate in a ratio of approximately 2:3 (manufactured by Daicel-Allnex Co., Ltd., functional group number: approximately 3.4). IRR 214-K: Tricyclodecane dimethanol diacrylate (manufactured by Daicel Allnex Co., Ltd., number of functional groups: 2). EBECRYL 160: Ethoxylated trimethylolpropane triacrylate (manufactured by Daicel-Allnex Co., Ltd., number of functional groups: 3). DPHA: a mixture of dipentaerythritol hexaacrylate and dipentaerythritol pentaacrylate in a ratio of approximately 1:3 (manufactured by Daicel Allnex Co., Ltd., functional group number: approximately 5.2). The value of the number of functional groups of component (B) was taken from the catalog value of each product.

[0080] <(C) component> HBA: 4-hydroxybutyl acrylate (Osaka Organic Chemical Industry Co., Ltd.). HEMA: 2-hydroxyethyl methacrylate (manufactured by Nippon Shokubai Co., Ltd.). <(D) component> β-CEA: β-carboxyethyl acrylate (containing 20% ​​acrylic acid) (manufactured by Daicel Allnex Co., Ltd., acid value: 365 mg KOH / g). <(E) component> SPMAK: 3-sulfopropyl potassium methacrylate (Tokyo Chemical Industry Co., Ltd.).

[0081] <Photopolymerization initiator> Omnirad 127: 2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropionyl)benzyl)phenyl)-2-methylpropan-1-one (IGM Resins BV) Benzophenone (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.). <Dilution solvent> 2-Methoxyethanol (Fujifilm Wako Pure Chemical Industries, Ltd.).

[0082] [Examples 1 to 17 and Comparative Examples 1 to 6] Using the above materials, each component was weighed into an brown screw cap bottle in the proportions shown in Tables 1 and 2, and heated at 70°C for 1 hour. Stirring and degassing were carried out using a stirring and degassing device (manufactured by Kurabo Industries, Ltd., product name "Mazerustar (registered trademark)"), and dissolution was confirmed visually to obtain each curable composition according to the examples and comparative examples. Each of the curable compositions according to the examples and comparative examples was cured by the following steps to obtain a member including a cured coating film. (1) Coating process Using a wire bar coater No. 14-18, the curable composition of each example was applied onto a substrate film (PMMA film (manufactured by Sumitomo Chemical Co., Ltd., product name "Technoloy (registered trademark) S104G")) so that the film thickness after drying would be 10 μm. (2) Drying process The mixture was left standing in an oven at 80°C for 15 minutes to remove the solvent. (3) Photo-curing process Under a nitrogen gas atmosphere, an inverter UV exposure machine (manufactured by Eye Graphics Co., Ltd., product name "EYE INVERTOR GRANDAGE ECS-4011GX", light source: high-pressure mercury lamp) was used, and ultraviolet intensity: 150 mW / cm 2 , Accumulated light intensity: 600mJ / cm 2 The curable composition was cured under the conditions above to obtain a member including a cured coating film.

[0083] For members containing cured coating films according to the Examples and Comparative Examples, the transparency and flexibility of the cured coating films were evaluated under the following conditions. The water contact angle was also measured under the following conditions to evaluate the hydrophilicity of the cured coating films. The results are shown in Tables 1 and 2.

[0084] <Transparency evaluation of cured coating film> The total light transmittance and haze value of the cured coating film were measured under the following conditions. Furthermore, the transparency was evaluated based on the total light transmittance and haze value according to the following evaluation criteria. The results are shown in Tables 1 and 2. (Measurement of total light transmittance) The total light transmittance of the cured coating film of each example was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "NDH 4000") in accordance with JIS K 7361-1. The measurement was carried out from the cured coating film side. (Haze measurement) The haze of each example was measured at five random locations on the member containing the cured coating film using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "NDH 4000") in accordance with JIS K 7136. The average value of these measurements was taken as the haze value of the cured coating film of each example. (Evaluation criteria (transparency)) Pass: Total light transmittance was over 90% and haze value was less than 1.0%. Failed: The total light transmittance was more than 90% and the haze value was 1.0% or more.

[0085] <Evaluation of flexibility of cured coating film> A 180-degree bending test was carried out using a member containing a cured coating film under the following conditions. Based on the test results obtained, flexibility was evaluated according to the following evaluation criteria, with a grade of B or higher being considered a pass. (180 degree bending test) The cured coating side of the member was placed on the outside, and a 180-degree bending test was carried out with N=5. (Evaluation criteria (flexibility)) A: When bent 180 degrees, the cured coating film did not crack and no whitening was observed. B: When bent 180 degrees, the cured coating film showed no obvious cracks but whitening was observed. C: Cracks occurred in the cured coating film when bent 180 degrees.

[0086] <Water contact angle (hydrophilicity) evaluation> The water contact angle of the cured coating film surface was measured under the following conditions, and the results are shown in Tables 1 and 2. If the water contact angle is less than 30°, the cured coating film surface can be evaluated as being hydrophilic. (Water contact angle measurement) Using a contact angle meter (portable contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., product name "PCA-11"), a droplet (2 μl) of ion-exchanged water was dropped onto the surface of the cured coating film of a component containing the cured coating film. The contact angle was measured 30 seconds after the drop was automatically detected. Contact angles were measured at five random locations on the cured coating film surface, and the average of these measurements was taken as the water contact angle of the cured coating film surface.

[0087] [Table 1]

[0088] [Table 2]

[0089] As shown in Tables 1 and 2, the curable compositions of Examples 1 to 17 gave cured products that were highly transparent and flexible enough to withstand processing such as winding and bending. On the other hand, the curable compositions of Comparative Examples 1 and 2, which did not contain the components (A) and (D), had low transparency and cracked in the cured products in a 180-degree bending test. The cured products obtained from the curable compositions of Comparative Examples 3 to 6, which did not contain the component (A), had high transparency but cracked in the 180-degree bending test. From the above results, it was confirmed that the curable composition according to the first embodiment can give cured products that are transparent and flexible enough to withstand processing such as winding and bending.

Claims

1. Contains a curable component and a photopolymerization initiator, The curable component is (A) component: difunctional or higher functional urethane (meth)acrylate, (B) component: a (meth)acrylate having no di- or higher functional urethane bond; (C) component: a less than difunctional hydroxyl group-containing (meth)acrylate, Component (D): an acid group-containing (meth)acrylate, and Component (E): (meth)acrylic-modified sulfonate, An active energy ray-curable composition comprising:

2. 2. The active energy ray-curable composition according to claim 1, wherein a proportion of the component (A) with respect to the total mass of the curable components is 5 to 60 mass %.

3. 3. The active energy ray-curable composition according to claim 1, wherein the weight average molecular weight (Mw) of the component (A) is 10,000 or less.

4. 3. The active energy ray-curable composition according to claim 1, wherein a proportion of the component (B) relative to the total mass of the curable components is 20 to 70 mass%.

5. 3. The active energy ray-curable composition according to claim 1, wherein the component (A) comprises a di- to tetra-functional aliphatic urethane (meth)acrylate.

6. 3. The active energy ray-curable composition according to claim 1, wherein the component (B) has an average number of functional groups of 2 to 6.

7. A cured product of the active energy ray-curable composition according to claim 1 or 2.

8. A member comprising the cured product according to claim 7.

9. The member according to claim 8, which is an interior member or a member for use in a wet area.

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