Coating agent for forming anti-fogging film, method for manufacturing anti-fogging article, and anti-fogging article

Abstract

To provide a coating agent for forming an antifogging film, with which an antifogging film having excellent antifogging and antifouling properties can be formed with one liquid, a production method of an antifogging article using the coating agent for forming the antifogging film, and the antifogging article.SOLUTION: Provided is a coating agent for forming an antifogging film including: (A) a polyisocyanate having two or more isocyanate groups; (B) a polyol including an oxyethylene unit as a repeating unit and having two or more hydroxy groups in the molecule; (C) an acrylic resin having two or more hydroxy groups in the molecule; (D) a water-repellent; and (E) a solvent, wherein the water-repellent (D) includes at least one compound selected from the group consisting of a specific polydialkylsiloxane, a specific fluoroalkylsilane and a specific perfluoropolyether. Also provided are a production method of an antifogging article using the coating agent for forming the antifogging film, and the antifogging article.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a coating agent for forming an anti-fogging film, a method for producing an anti-fogging article, and an anti-fogging article. [Background technology]

[0002] To ensure visibility on transparent substrates such as bathroom and vanity mirrors, car window glass, and camera lenses, there is a strong demand for anti-fogging properties on the surface of these substrates.

[0003] Fogging on the main surface of glass substrates such as mirrors and glass is caused by condensation, in which countless minute water droplets form on the substrate surface. To prevent this fogging, technologies have been investigated for forming on the substrate a hydrophilic coating that turns the countless minute water droplets formed on the substrate surface into a uniform water film, or a water-absorbent coating that exhibits anti-fogging properties by capturing water vapor and water droplets in the coating. Recently, there has been a demand for not only anti-fogging properties but also anti-fouling properties that prevent the surface of a substrate from becoming soiled. Patent Document 1 describes an anti-fogging article having a structure in which a polyurethane coating and a coating made of a cured product of a composition containing an anti-fouling agent are laminated on a substrate in order to impart anti-fouling properties in addition to anti-fogging properties. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-4350 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, a polyurethane coating is provided on a substrate, and a coating made of a composition containing an antifouling agent is further laminated on top of that to provide an antifogging article with excellent antifogging and antifouling properties. In Patent Document 1, at least two types of coating agents are required: a coating agent for forming a polyurethane film and a coating agent containing an antifouling agent, and the coating step must be carried out at least twice.

[0006] An object of the present disclosure is to provide a coating agent for forming an anti-fogging film, which is a one-component agent that can form an anti-fogging film that has excellent anti-fogging and anti-fouling properties. Another object of the present disclosure is to provide a method for producing an anti-fogging article, which can produce an anti-fogging article having excellent anti-fogging and anti-fouling properties through a single coating step. Another object of the present disclosure is to provide an anti-fogging article having a single-layer anti-fogging coating that has excellent anti-fogging and anti-fouling properties. [Means for solving the problem]

[0007] The problem of the present disclosure is solved by the following configuration.

[0008] <1> (A) a polyisocyanate having two or more isocyanate groups; (B) a polyol having an oxyethylene unit as a repeating unit and having two or more hydroxy groups in the molecule; (C) an acrylic resin having two or more hydroxy groups in the molecule; (D) a water repellent; (E) a solvent; Including, The water repellent (D) comprises at least one compound selected from the group consisting of the following (D1), (D2), and (D3): (D1) A linear polydialkylsiloxane having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having an average of 5 to 400 dialkylsiloxane moieties (SiRO, where R each independently represents a linear or branched alkyl group having 1 to 10 carbon atoms). (D2) Fluoroalkylsilane having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having a fluorocarbon moiety. (D3) A perfluoropolyether having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having a fluorocarbon moiety. <2> Further, (H) a blocked polyisocyanate having two or more blocked isocyanate groups is contained. <1> 2. The coating agent for forming an anti-fogging film according to claim 1. <3> the polyol (B) comprises (B1) polyethylene glycol and (B2) a copolymer polyol having an oxyethylene unit and an oxypropylene unit as repeating units; <1> or <2> 2. The coating agent for forming an anti-fogging film according to claim 1. <4> Further, (F) polytetramethylene ether glycol is included. <1> ~ <3> 10. The coating agent for forming an anti-fogging film according to claim 9, wherein the coating agent is a fluororesin. <5> Further, (G) a short-chain polyol having a number average molecular weight of 60 to 200 is contained. <1> ~ <4> 10. The coating agent for forming an anti-fogging film according to claim 9, wherein the coating agent is a fluororesin. <6> The content of the water repellent (D) is 0.01 to 10.0% by mass relative to 100% by mass of the urethane-forming components. <1> ~ <5> 10. The coating agent for forming an anti-fogging film according to claim 9, wherein the coating agent is a fluororesin. <7> Number of isocyanate groups in the urethane-forming component, n (NCO) and the number of hydroxyl groups in the urethane-forming component, n (OH) The ratio of n (NCO) / n (OH) is 1.0 to 3.0, <1> ~ <6> 10. The coating agent for forming an anti-fogging film according to claim 9, wherein the coating agent is a fluororesin. <8> The content of the polyol (B) is 15 to 35% by mass relative to 100% by mass of the urethane-forming components. <1> ~ <7> 10. The coating agent for forming an anti-fogging film according to claim 9, wherein the coating agent is a fluororesin. <9> The content of the acrylic resin (C) is 5 to 20% by mass relative to 100% by mass of the urethane-forming components. <1> ~ <8> 10. The coating agent for forming an anti-fogging film according to claim 9, wherein the coating agent is a fluororesin. <10> A method for producing an anti-fogging article having a substrate and an anti-fogging coating, comprising: On the surface of the substrate, <1> ~ <9> a step (1) of applying the anti-fogging coating agent according to any one of the above to form a coating film; a step (2) of evaporating the solvent (E) from the coating film and curing the coating film to form an anti-fogging coating; A method for manufacturing an anti-fogging article, comprising: <11> the substrate is a glass substrate, A silane coupling agent having an amino group is applied to the surface of the glass substrate. <10> A method for producing the anti-fogging article described in 1. <12> In the step (2), the isocyanate group of the polyisocyanate (A) reacts with the hydroxy groups of the polyol (B) and the acrylic resin (C) to form a polyurethane. <10> or <11> A method for producing the anti-fogging article described in 1. <13> In the step (2), the coating film is heated at 80 to 170°C. <10> ~ <12> 10. A method for producing an anti-fogging article according to any one of the above. <14> An anti-fogging article having a substrate and an anti-fogging coating, The anti-fogging coating is <1> ~ <9> a coating comprising a polyurethane resin that is a cured product of the coating agent for forming an anti-fogging coating according to any one of the above items, The anti-fogging coating has a thickness of 5 μm to 50 μm. Anti-fog articles. <15> The pencil hardness of the anti-fogging coating is 2H or more. <14> The anti-fogging article according to claim 1. <16> the substrate is a glass substrate, A silane coupling agent having an amino group is applied to the surface of the glass substrate. <14> or <15> The anti-fogging article according to claim 1. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a coating agent for forming an anti-fogging film, which is capable of forming an anti-fogging film having excellent anti-fogging and anti-fouling properties with a single liquid. Furthermore, the present disclosure can provide a method for producing an anti-fogging article that can produce an anti-fogging article having excellent anti-fogging properties and anti-fouling properties through a single coating step. Furthermore, according to the present disclosure, it is possible to provide an anti-fogging article having a single-layer anti-fogging coating that is excellent in anti-fogging and anti-fouling properties. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Anti-fogging coating agent] The coating agent for forming an anti-fogging film of the present disclosure comprises: (A) a polyisocyanate having two or more isocyanate groups; (B) a polyol having an oxyethylene unit as a repeating unit and having two or more hydroxy groups in the molecule; (C) an acrylic resin having two or more hydroxy groups in the molecule; (D) a water repellent; (E) a solvent; Including, The water repellent (D) is a coating agent for forming an anti-fogging film, which contains at least one compound selected from the group consisting of the following (D1), (D2), and (D3): (D1) A linear polydialkylsiloxane having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having an average of 5 to 400 dialkylsiloxane moieties (SiRO, where R each independently represents a linear or branched alkyl group having 1 to 10 carbon atoms). (D2) Fluoroalkylsilane having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having a fluorocarbon moiety. (D3) A perfluoropolyether having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having a fluorocarbon moiety.

[0011] <(A) Polyisocyanate having two or more isocyanate groups> (A) Polyisocyanate having two or more isocyanate groups (also referred to as "polyisocyanate (A)") will be explained. The polyisocyanate (A) serves as a skeletal component of the anti-fogging coating (also simply referred to as "coating") and can impart water absorbency and hardness to the coating. The polyisocyanate (A) is not particularly limited, and examples thereof include compounds having 2 to 5 isocyanate groups, such as hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, bis(methylcyclohexyl) diisocyanate, and toluene diisocyanate. The polyisocyanate (A) may be a polymer (e.g., a dimer, a trimer, etc.) or may have at least one structure selected from the group consisting of an allophanate structure, an adduct structure, a biuret structure, and an isocyanurate structure. For example, it may be a dimer made from hexamethylene diisocyanate as a starting material, a compound having an allophanate structure made from hexamethylene diisocyanate as a starting material, or a compound having a biuret structure made from hexamethylene diisocyanate as a starting material. When the polyisocyanate (A) is a polymer, the number average molecular weight is preferably 100 to 20,000, more preferably 150 to 5,000, and particularly preferably 200 to 2,000.

[0012] <(B) Polyol Having Oxyethylene Units as Repeating Units and Two or More Hydroxy Groups in the Molecule> (B) A polyol having an oxyethylene unit as a repeating unit and having two or more hydroxy groups in the molecule (also referred to as "polyol (B)") will be described. The polyol (B) contains oxyethylene units as repeating units, and can impart water absorbency to the anti-fogging coating. The polyol (B) is not particularly limited, but examples thereof include (B1) polyethylene glycol and (B2) copolymer polyols having oxyethylene units and oxypropylene units as repeating units, and it is preferable to include both (B1) and (B2).

[0013] The copolymer polyol (B2) can be a polyether polyol obtained by ring-opening polymerization of ethylene oxide and propylene oxide using a phosphazene compound, a Lewis acid compound, or an alkali metal compound catalyst as an initiator, followed by block or random addition. Such polyols are commercially available, and examples thereof include "Toho Polyol PB-4000 (manufactured by Toho Chemical Industry Co., Ltd.)." The molar ratio of oxyethylene units / oxypropylene units in the copolymer polyol (B2) may be 45 / 55 to 90 / 10, and preferably 70 / 30 to 80 / 20.

[0014] The number average molecular weight of the polyol (B) is preferably 500 to 20,000, more preferably 1,000 to 15,000, further preferably 1,500 to 12,000, and particularly preferably 2,000 to 6,000.

[0015] <(C) Acrylic resin having two or more hydroxy groups in the molecule> (C) An acrylic resin having two or more hydroxy groups in the molecule (also referred to as "acrylic resin (C)") will be described. The acrylic resin (C) is a copolymer of copolymerizable monomers such as hydroxyalkyl (meth)acrylate and alkyl (meth)acrylate, and serves as the backbone component of the anti-fogging coating, contributing to improving the hardness of the coating.

[0016] Specific examples of the acrylic resin (C) include those obtained by copolymerizing a hydroxyl group-containing monomer such as 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, or N-methylolacrylamide with styrene, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, acrylonitrile, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, 2-ethylhexyl acrylate, or 2-ethylhexyl methacrylate.

[0017] Further examples include those obtained by copolymerizing an amino group-containing monomer such as 2-dimethylaminoethyl methacrylate or tert-butylaminoethyl methacrylate, a glycidyl group-containing monomer such as glycidyl acrylate or glycidyl methacrylate, an amino group-containing monomer such as acrylamide or methacrylamide, an acid group-containing monomer such as acrylic acid, methacrylic acid, maleic anhydride, crotonic acid, fumaric acid or itaconic acid, or a fumaric acid ester or itaconic acid ester with the above-mentioned hydroxyl group-containing monomer.

[0018] The number average molecular weight of the acrylic resin (C) is preferably 500 or more, more preferably 5,000 to 25,000, even more preferably 8,000 to 25,000, and particularly preferably 12,000 to 20,000.

[0019] A commercially available acrylic resin (C) can also be used. Commercially available acrylic resins (C) include, for example, Acrydic 47-538-BA (manufactured by DIC Corporation).

[0020] <(D) Water repellent> (D) Water repellent agent (also referred to as "water repellent agent (D)") will be explained. The water repellent (D) is a component that imparts antifouling properties to the antifogging coating. The water repellent (D) contains at least one compound selected from the group consisting of the following (D1), (D2), and (D3): (D1) A linear polydialkylsiloxane (also referred to as "compound (D1)") having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having an average of 5 to 400 dialkylsiloxane moieties (SiRO, where R each independently represents a linear or branched alkyl group having from 1 to 10 carbon atoms). (D2) A fluoroalkylsilane (also referred to as "compound (D2)") having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having a fluorocarbon moiety. (D3) A perfluoropolyether having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having a fluorocarbon moiety (also referred to as "compound (D3)").

[0021] In the compounds (D1), (D2), and (D3), the functional group that generates a hydroxy group upon hydrolysis includes an alkoxy group, preferably a linear or branched alkoxy group having 1 to 6 carbon atoms, and specific examples thereof include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, and a butoxy group.

[0022] (Compound (D1)) The compound (D1) has a dialkylsiloxane moiety that has excellent slip properties, and therefore can impart antifouling properties to the coating.

[0023] In the compound (D1), the average number of dialkylsiloxane moieties (SiR2O) is preferably 20 to 50 in order to obtain a coating film with even better antifouling properties and durability. R in SiR2O is preferably a methyl group or an ethyl group, and more preferably a methyl group.

[0024] As the compound (D1), for example, polydimethylsiloxane represented by the following general formula [1] is preferably used.

[0025] [ka]

[0026] In general formula [1], X 1 and X 2 each independently represents a monovalent or divalent functional group, a and b each independently represents an integer of 0 to 3, and n is an integer of 10 to 400, provided that a+b is 1 or more, and X 1 and X 2 At least one of the groups is at least one selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group.

[0027] X 1 and X 2 Specific examples of the monovalent or divalent functional group represented by are a hydroxy group, an amino group, an epoxy group, a carboxy group, an acryloyl group, an allyl group, a mercapto group, -C(=O)-OR 1 Group(R 1 represents a linear or branched saturated alkyl group having 1 to 4 carbon atoms), -OC(=O)R 1 Group(R 1 is -C(=O)-OR 1 Group R 1 (same as -A) 1 -B 1 Group(A 1 represents a divalent organic group, B 1 is a hydroxy group, amino group, epoxy group, -C(=O)-OR 1 Group(R1 represents a linear or branched saturated alkyl group having 1 to 4 carbon atoms) or -OC(=O)R 1 Group(R 1 is -C(=O)-OR 1 Group R 1 represents the same as ), -A 1 -C(A 2 )(A 3 B 2 )(A 4 B 3 ) group (A 1 represents a divalent organic group, and A 2 represents a hydrogen atom or a monovalent organic group, and A 3 and A 4 each independently represents a divalent organic group. 2 or B 3 each independently represents a hydroxy group, an amino group, an epoxy group, a carboxy group, an acryloyl group, an allyl group, a mercapto group, or -C(=O)-OR 1 Group(R 1 represents a linear or branched saturated alkyl group having 1 to 4 carbon atoms) or -OC(=O)R 1 Group(R 1 is -C(=O)-OR 1 Group R 1 (same as

[0028] (Compound (D2)) The fluorocarbon moiety in compound (D2) is preferably CF2 or CF3. As the compound (D2), a fluoroalkylsilane having a functional group at one end, represented by the following general formula [2], or a fluoroalkylsilane having functional groups at both ends, represented by the following general formula [3], is preferably used.

[0029] [ka]

[0030] In general formula [2], Y 1each independently represents a monovalent functional group; p is an integer of 1 to 3 and represents the number of functional groups; and m is an integer of 2 to 6, provided that at least one Y 1 represents at least one selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group.

[0031] [ka]

[0032] In general formula [3], Y 2 and Y 3 each independently represents a monovalent functional group; m is an integer of 2 to 6 and represents the number of fluorocarbon moieties; q and r are each independently an integer of 1 to 3 and represent the number of monovalent functional groups; provided that Y 2 and Y 3 At least one of represents at least one selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group.

[0033] Compound (D2) has a fluorocarbon moiety that has excellent stain-resistant properties and removability against stain components such as sebum components, fingerprints, and water stains, as well as excellent durability, and is therefore effective in improving the stain-resistant properties and durability of the resulting coating. In addition, the compound (D2) may have a perfluoroalkyl group (CF3(CF2)) having 2 to 6 fluorocarbon moieties in the molecule. t-1 -) or perfluoroalkylene group (-(CF2) u Increasing the number of fluorocarbon moieties increases the durability of the resulting antifouling coating. t and u represent integers, and the "-" represents a bond.

[0034] (Compound (D3)) The fluorocarbon moiety in compound (D3) is preferably CF2 or CF3. The compound (D3) is preferably one represented by any one of the following general formulas [4] to [6].

[0035] [ka]

[0036] In general formula [4], Rf 1 is the formula:-C p F 2p a structure represented by -O- (where p is an integer of 1 to 6), or -C q F 2q -(q is an integer of 1 to 8). Each Z independently represents a linear or branched alkoxy group having 1 to 6 carbon atoms, and specific examples thereof include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, and a butoxy group. R is an alkyl group having 1 to 10 carbon atoms, and a is an integer of 1 to 3. n and n' are each integers of 1 to 5, and m and m' are each integers of 0 to 2.

[0037] [ka]

[0038] In the general formula [5], r represents an integer of 1 to 200. Each Z independently represents a linear or branched alkoxy group having 1 to 6 carbon atoms, and specific examples of such groups include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, and a butoxy group.

[0039] [ka]

[0040] In the general formula [6], s represents an integer of 1 to 100, and t represents an integer of 1 to 10. Each Z independently represents a linear or branched alkoxy group having 1 to 6 carbon atoms, and specific examples of such groups include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, and a butoxy group.

[0041] Like compound (D2), compound (D3) also has a fluorocarbon moiety that has excellent stain-resistant properties and removability against stain components such as sebum components, fingerprints, and water stains, as well as excellent durability, and is therefore effective in improving the stain-resistant properties and durability of the resulting coating.

[0042] <(E) Solvent> (E) Solvent (also referred to as "solvent (E)") will be explained. As the solvent (E), it is preferable to use an acetate ester solvent or a ketone. Specific examples of the acetate ester solvent include amyl acetate, allyl acetate, isoamyl acetate, isobutyl acetate, isopropyl acetate, ethyl acetate, 2-ethylhexyl acetate, cyclohexyl acetate, n-butyl acetate, s-butyl acetate, propyl acetate, benzyl acetate, methyl acetate, and methylcyclohexyl acetate. Examples of the ketone include acetylacetone, acetone, isophorone, ethyl-n-butyl ketone, diisobutyl ketone, diisopropyl ketone, diethyl ketone, cyclohexanone, di-n-propyl ketone, methyl oxide, methyl-n-amyl ketone, methyl isobutyl ketone, methyl ethyl ketone, methylcyclohexanone, methyl-n-butyl ketone, methyl-n-propyl ketone, methyl-n-hexyl ketone, methyl-n-heptyl ketone, diacetone alcohol, and mixtures thereof. Particularly preferred are isobutyl acetate, n-butyl acetate, s-butyl acetate, methyl ethyl ketone, and the like.

[0043] <(F) Polytetramethylene ether glycol> The coating agent for forming an anti-fogging coating according to the present disclosure may further contain (F) polytetramethylene ether glycol (also referred to as "polytetramethylene ether glycol (F)"). The number average molecular weight of the polytetramethylene ether glycol (F) is preferably 100 to 4,000, more preferably 500 to 2,000, and particularly preferably 800 to 1,200.

[0044] <(G) Short-chain polyol with a number-average molecular weight of 60 to 200> The coating agent for forming an anti-fogging coating of the present disclosure may further contain (G) a short-chain polyol having a number average molecular weight of 60 to 200 (also referred to as "short-chain polyol (G)"). The short-chain polyol (G) is a polyol having a number average molecular weight in the range of 60 to 200 and a short chain length. The inclusion of the short-chain polyol (G) tends to improve the hardness of the coating. The number of hydroxyl groups per molecule of the short-chain polyol (G) may be 2 or 3.

[0045] Examples of the short-chain polyol (G) include alkyl polyols such as ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 2-butene-1,4-diol, 2-methyl-2,4-pentanediol, 2-ethyl-1,3-hexanediol, diethylene glycol, dipropylene glycol, triethylene glycol, glycerin, 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, 1,2,6-hexanetriol, and 2,2'-thiodiethanol, and alkanolamines such as diethanolamine and triethanolamine. These may be used alone or in the form of a mixture, or a copolymer having a number average molecular weight of 60 to 200.

[0046] Among these, ethylene glycol and triethylene glycol are preferred from the viewpoint of improving the hardness of the coating film, and short-chain polyols having secondary or tertiary hydroxyl groups that are less active than primary hydroxyl groups, such as 1,2-propanediol, 1,2-butanediol, 1,3-butanediol, and 2,3-butanediol, are preferred from the viewpoint of the stability of the coating liquid (extending the pot life).

[0047] <(H) Blocked polyisocyanate having two or more blocked isocyanate groups> The coating agent for forming an antifogging coating according to the present disclosure preferably further contains (H) a blocked polyisocyanate having two or more blocked isocyanate groups (also referred to as "blocked polyisocyanate (H)"). The blocked polyisocyanate (H) serves as a framework component of the anti-fogging coating, and can improve the water absorption of the coating. The blocked isocyanate group is a group in which an isocyanate group is protected with a blocking agent, and the blocking agent is dissociated by heat treatment, regenerating the isocyanate group. However, in the present disclosure, it is preferable to use the blocked polyisocyanate (H) without dissociating the blocking agent. As will be described later, curing of the coating film in step (2) of the method for producing an anti-fogging article of the present disclosure (the operation of reacting the raw materials in the coating film to form polyurethane) is preferably carried out at 80 to 170°C, but within this temperature range, the blocking agent for the blocked isocyanate group of the blocked polyisocyanate (H) usually does not dissociate. The reason why the inclusion of the blocked polyisocyanate (H) in the coating agent for forming an anti-fogging coating of the present disclosure improves water absorbency is not clear, but the inventors presume that the blocked polyisocyanate (H) reacts with the polyisocyanate (A) to form an allophanate, producing a high molecular weight polyisocyanate, and this high molecular weight polyisocyanate reacts with the polyol (B) and the acrylic resin (C) to form a polyurethane with a large network structure, thereby improving water absorbency.

[0048] The blocked polyisocyanate (H) is not particularly limited, and may be, for example, one in which the isocyanate groups of the above-mentioned polyisocyanate (A) are protected with a known blocking agent. The blocked polyisocyanate (H) preferably has a urethane bond (—NHCOO—) in the molecule. The number average molecular weight of the blocked polyisocyanate (H) is preferably 100 to 20,000, more preferably 150 to 5,000, and particularly preferably 200 to 2,000.

[0049] <Urethane-forming components> As used herein, the term "urethane-forming components" refers to all components contained in the coating agent for forming an anti-fogging coating of the present disclosure that are raw materials for forming polyurethane, excluding the water repellent (D). Typically, the "urethane-forming components" refer to the polyisocyanate (A), polyol (B), acrylic resin (C), polytetramethylene ether glycol (F), short-chain polyol (G), and blocked polyisocyanate (H) in the coating agent for forming an anti-fogging coating of the present disclosure. When the coating agent for forming an anti-fogging coating according to the present disclosure contains polyisocyanate (A), polyol (B), and acrylic resin (C) but does not contain polytetramethylene ether glycol (F), short-chain polyol (G), and blocked polyisocyanate (H), the "urethane-forming components" are polyisocyanate (A), polyol (B), and acrylic resin (C). Furthermore, when the coating agent for forming an anti-fogging coating according to the present disclosure contains polyisocyanate (A), polyol (B), acrylic resin (C), and blocked polyisocyanate (H) but does not contain polytetramethylene ether glycol (F) and short-chain polyol (G), the "urethane-forming components" are polyisocyanate (A), polyol (B), acrylic resin (C), and blocked polyisocyanate (H). In other cases, the "urethane-forming component" is considered to be the same as above.

[0050] <Content of each ingredient> The content of polyisocyanate (A) in the coating agent for forming an anti-fogging coating of the present disclosure is preferably 25 to 60 mass %, more preferably 30 to 50 mass %, and even more preferably 35 to 45 mass %, relative to 100 mass % of the urethane-forming components.

[0051] The content of polyol (B) in the coating agent for forming an anti-fogging coating of the present disclosure is preferably 15 to 35 mass %, more preferably 20 to 32 mass %, and even more preferably 26 to 30 mass %, relative to 100 mass % of the urethane-forming components.

[0052] The content of the acrylic resin (C) in the coating agent for forming an anti-fogging film of the present disclosure is preferably 10 to 18 mass %, more preferably 12 to 16 mass %, relative to 100 mass % of the urethane-forming components.

[0053] The content of the water repellent (D) in the coating agent for forming an anti-fogging coating of the present disclosure is preferably 0.01 to 10.0 mass%, more preferably 0.02 to 5.0 mass%, and even more preferably 0.05 to 2.0 mass%, relative to 100 mass% of the urethane-forming components.

[0054] When the coating agent for forming an anti-fogging coating of the present disclosure contains polytetramethylene ether glycol (F), the content of polytetramethylene ether glycol (F) in the coating agent for forming an anti-fogging coating of the present disclosure is preferably 5 to 15 mass %, more preferably 8 to 10 mass %, relative to 100 mass % of the urethane-forming components.

[0055] When the coating agent for forming an anti-fogging coating of the present disclosure contains a short-chain polyol (G), the content of the short-chain polyol (G) in the coating agent for forming an anti-fogging coating of the present disclosure is preferably 1 to 15 mass %, more preferably 2 to 10 mass %, and even more preferably 3 to 8 mass %, relative to 100 mass % of the urethane-forming components.

[0056] When the coating agent for forming an anti-fogging coating of the present disclosure contains a blocked polyisocyanate (H), the content of the blocked polyisocyanate (H) in the coating agent for forming an anti-fogging coating of the present disclosure is preferably 2 to 20 mass %, more preferably 5 to 15 mass %, and even more preferably 6 to 8 mass %, relative to 100 mass % of the urethane-forming components.

[0057] The content of the solvent (E) in the coating agent for forming an anti-fogging coating of the present disclosure can be adjusted, for example, so that the solid content concentration in the coating agent for forming an anti-fogging coating of the present disclosure is 10 to 50 mass %. The solid content refers to all components in the coating agent for forming an anti-fogging coating of the present disclosure excluding the solvent (E), and the solid content concentration refers to the concentration (content) of the solids.

[0058] <n (NCO) / n (OH) > The number n of isocyanate groups in the urethane-forming component in the coating agent for forming an anti-fogging film of the present disclosure (NCO) and the number of hydroxyl groups in the urethane-forming component, n (OH) The ratio of n (NCO) / n (OH) is preferably 1.0 to 3.0, more preferably 1.1 to 2.5, and even more preferably 1.2 to 2.0. The number of blocked isocyanate groups is determined by the number of isocyanate groups, n (NCO) shall not be included in the

[0059] <Other ingredients and their contents> The coating agent for forming an anti-fogging film of the present disclosure may contain a curing catalyst in order to increase the curing rate when the coating film formed by applying the coating agent for forming an anti-fogging film is cured to form an anti-fogging film. When the coating agent for forming an anti-fogging coating of the present disclosure contains a curing catalyst, the content of the curing catalyst in the coating agent for forming an anti-fogging coating of the present disclosure is preferably 0.001 to 0.5 mass % relative to 100 mass % of the urethane-forming components. Examples of the curing catalyst include organometallic compounds such as organotin compounds, organotitanium compounds, organozirconium compounds and organobismuth compounds, and amine compounds.

[0060] The coating agent for forming an anti-fogging coating of the present disclosure may contain a leveling agent that promotes the smoothness of the coating film on the substrate. When the coating agent for forming an anti-fogging coating film of the present disclosure contains a leveling agent, the content of the leveling agent in the coating agent for forming an anti-fogging coating film of the present disclosure is preferably 0.01 to 0.50 mass %, and more preferably 0.05 to 0.25 mass %, relative to 100 mass % of the urethane-forming components.

[0061] The coating agent for forming an anti-fogging film of the present disclosure may contain additives that improve the heat resistance, weather resistance, and water resistance of the coating film. Examples of the additives include hindered amine light stabilizers, benzotriazole ultraviolet absorbers, hindered phenol antioxidants, carbodiimide hydrolysis inhibitors, etc. The additives may be used alone or in combination. When the coating agent for forming an anti-fogging coating of the present disclosure contains the above-mentioned additives, the content of the additives in the coating agent for forming an anti-fogging coating of the present disclosure is preferably 0.2 to 10.0 mass %, and more preferably 0.5 to 2.0 mass %, relative to 100 mass % of the urethane-forming components.

[0062] The uses of the anti-fogging coating coating agent of the present disclosure are not particularly limited, and examples thereof include mirrors and window glass for bathrooms, vanities, etc. in architecture; window glass or mirrors, specifically rearview mirrors and door mirrors, for vehicles, ships, aircraft, etc.; lenses for eyeglasses and cameras, goggles, helmet shields, openings and peepholes in refrigerated showcases, freezer showcases, testing machines, precision instrument cases, etc.; road reflectors; and displays of mobile communication devices such as mobile phones.

[0063] [Method for manufacturing anti-fogging articles] The method for producing an anti-fogging article of the present disclosure includes: A method for producing an anti-fogging article having a substrate and an anti-fogging coating, comprising: Step (1) of applying the anti-fogging coating agent of the present disclosure to the surface of a substrate to form a coating film; a step (2) of evaporating the solvent (E) from the coating film and curing the coating film to form an anti-fogging coating; The method for producing an anti-fogging article comprises the steps of:

[0064] By carrying out the above steps (1) and (2) in this order, an anti-fogging article can be obtained.

[0065] <Base material> The substrate is preferably a plate-shaped one, typically glass, which is a type of plate glass commonly used for automobiles, buildings, industrial glass, etc., and is produced by the float method, duplex method, roll-out method, etc., and is not particularly limited by its production method.

[0066] As the type of glass, various types of colored glass such as clear, green, bronze, etc.; various types of functional glass such as UV-cut glass, IR-cut glass, and electromagnetic shielding glass; glass that can be used as fire-resistant glass such as wired glass, low-expansion glass, and zero-expansion glass; tempered glass and similar glass; laminated glass and double-glazed glass; mirrors produced by silver coating or vacuum deposition, and various glass products such as flat plates and bent plates.

[0067] The thickness of the substrate is not particularly limited, but is preferably 1 mm or more and 10 mm or less, and particularly preferably 1 mm or more and 5 mm or less. The anti-fogging coating may be formed on only one side of the substrate, or on both sides depending on the application. The anti-fogging coating may be formed on the entire surface or a part of the surface of the substrate.

[0068] The surface of the glass substrate is preferably coated with a primer component such as a silane coupling agent to improve adhesion between the glass substrate and the anti-fogging coating. When applying the silane coupling agent to the substrate, the silane coupling agent may be diluted to about 0.05 to 2.0 mass % with alcohol, water, or the like. Examples of the silane coupling agent include aminosilane, mercaptosilane, and epoxysilane. Silane coupling agents having an amino group are particularly preferred, with γ-glycidoxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, 3-(2-aminoethylamino)propyltriethoxysilane, and the like being particularly preferred. Thus, the step of applying a solution containing the coupling agent to the substrate is a particularly preferred embodiment, as it improves adhesion between the substrate and the coating.

[0069] It is preferable that the substrate is a glass substrate, and that the surface of the glass substrate is coated with a silane coupling agent having an amino group.

[0070] The substrate may be a glass substrate, a resin film such as polyethylene terephthalate, or a resin such as polycarbonate. The anti-fogging coating may be formed on the surface of such a transparent resin substrate to form an anti-fogging article, which may then be attached to a glass substrate.

[0071] <Process (1)> Step (1) is a step of applying the above-described coating agent for forming an anti-fogging coating of the present disclosure to the surface of a substrate to form a coating film. Before step (1), the above-described substrate and the above-described coating agent for forming an anti-fogging coating according to the present disclosure are prepared. The coating agent for forming an anti-fogging coating of the present disclosure can be applied to a substrate by known means such as dip coating, flow coating, spin coating, roll coating, spray coating, screen printing, or flexographic printing.

[0072] <Process (2)> Step (2) is a step of evaporating the solvent (E) from the coating film and curing the coating film to form an anti-fogging coating. Curing a coating film specifically refers to reacting the raw materials in the coating film to form polyurethane and solidifying the coating film. In step (2), it is preferred that the isocyanate groups of the polyisocyanate (A) react with the hydroxy groups of the polyol (B) and the acrylic resin (C) to form a polyurethane. In step (2), the coating is left standing at room temperature or is heat-treated at 170° C. or less, whereby the solvent (E) evaporates while the coating is cured, and the coating is solidified to form an anti-fogging coating. To promote curing of the coating film, heating is preferably carried out at 80 to 170°C, more preferably at 100 to 165°C, and even more preferably at 120 to 160°C.

[0073] [Anti-fog articles] The anti-fog article of the present disclosure comprises: An anti-fogging article having a substrate and an anti-fogging coating, The anti-fogging coating is a coating containing polyurethane, which is a cured product of the coating agent for forming an anti-fogging coating according to the present disclosure, The anti-fogging coating has a thickness of 5 μm to 50 μm. It is an anti-fogging article.

[0074] The substrate of the anti-fogging article is as described in [Method for manufacturing an anti-fogging article]. In particular, it is preferable that the substrate is a glass substrate and that the surface of the glass substrate is coated with a silane coupling agent having an amino group.

[0075] The thickness of the anti-fogging coating is 5 μm to 50 μm, preferably 10 μm to 45 μm, more preferably 15 μm to 40 μm, and particularly preferably 20 μm to 30 μm.

[0076] The pencil hardness of the anti-fogging coating is preferably 2H or higher, and more preferably 3H or higher. [Example]

[0077] Examples of the present disclosure will be described below, but the present disclosure is not limited to the following examples.

[0078] In the present examples and comparative examples, an anti-fogging coating agent (coating liquid) for forming an anti-fogging film was prepared, and a coating film made of the coating liquid applied to a substrate was heat-treated and cured to form an anti-fogging film, thereby producing an anti-fogging article. The method for preparing the coating liquid and the method for producing the anti-fogging article are described below. Next, the quality of the obtained anti-fogging article was evaluated by the method shown below.

[0079] [Anti-fogging coating thickness]: The thickness of the anti-fogging coating was measured by making a cut on the surface of the anti-fogging coating with a cutter, and measuring the difference in level between the anti-fogging coating surface and the substrate surface with a surface roughness meter (Surfcorder ET-400 manufactured by Kosaka Laboratory Co., Ltd.). 0 A), and the average value of five points was taken as the film thickness of the anti-fogging coating.

[0080] [Appearance evaluation]: The appearance, transparency, and presence or absence of cracks of the anti-fogging coating were visually evaluated, and those without problems were rated as passed (◯), and those with problems were rated as failed (×).

[0081] [Water contact angle]: Approximately 2 μl of pure water was placed on the surface of the anti-fogging coating of the anti-fogging article, and the angle formed by the water droplet and the sample surface was measured using a contact angle meter, Model DM-501 manufactured by Kyowa Interface Science, in the atmosphere (approximately 25°C).

[0082] [Water stain removal performance]: Tap water was dropped onto the surface of the anti-fogging coating of an anti-fogging article placed horizontally, and after drying at 60°C for 1 hour, the article was wiped dry with a towel to attempt to remove water stains. After wiping dry, the substrate was visually inspected, and those for which the water stains could be removed were rated as passed (○), and those for which the water stains could not be removed were rated as failed (×). The antifouling properties were evaluated using an index of water stain removal performance.

[0083] [Anti-fogging]: In a room with a temperature of 10°C and a humidity of 30%, the surface of the anti-fogging coating of an anti-fogging article is exposed to saturated water vapor at 15°C. The time until the surface of the anti-fogging coating begins to fog up is taken as the anti-fogging time of the anti-fogging coating, with an anti-fogging time of more than 5 minutes 30 seconds being rated as ○, more than 3 minutes but less than 5 minutes 30 seconds being △, and less than 3 minutes being ×. ○ and △ are considered pass, and × is considered fail.

[0084] [Pencil hardness]: In accordance with JIS K 5600 General Testing Methods for Paints (1999), the surface of the anti-fogging coating was scratched twice with a pencil loaded with a load of 750 g, and the hardness of the pencil that did not tear the anti-fogging coating both times was taken as the pencil hardness of the anti-fogging coating. A hardness of 2H or higher was considered to be pass (◯), and a hardness of H or lower was considered to be fail (×).

[0085] [Example 1] (1) Preparation of anti-fogging coating agent As polyisocyanate (A), 16.77 g of a biuret-type polyisocyanate of hexamethylene diisocyanate (trade name "Desmodur N3200A" manufactured by Sumika Covestro Urethane, functional group number 3.3) was prepared. This was designated as Agent A. As the blocked polyisocyanate (H), 4.01 g of an isocyanurate-type blocked isocyanate (trade name "Burnoc DB-980K" manufactured by DIC, number of functional groups exceeding 3) was prepared. This was designated as Agent B.

[0086] In addition, the components described below were mixed in the amounts specified below to obtain a total of 81.49 g of Drug C.

[0087] <Solvent (E)> Mixture of isobutyl acetate, diacetone alcohol and isopropyl acetate: 51.58 g, acetylacetone: 1.8 g

[0088] <Polyol (B)> 10.11 g of oxyethylene / oxypropylene copolymer polyol having a number average molecular weight of 4000 (product name "Toho Polyol PB-4000"; manufactured by Toho Chemical Industry Co., Ltd.); Polyethylene glycol with a number average molecular weight of 1000; 1.62 g

[0089] <Acrylic resin (C)> A mixed solution containing 45.0% by mass of an acrylic polyol having a number-average molecular weight of 18,000 (trade name "Acrydic 47-538-BA"; manufactured by DIC Corporation); 13.48 g

[0090] <Short-chain polyol (G)> 2,3-butanediol (Tokyo Chemical Industry Co., Ltd.); 2.43g

[0091] <Leveling agent> Organically modified silicone substrate wetting agent KL-400HF (Kyoeisha Chemical Co., Ltd.); 0.03 g

[0092] <Water repellent (D)> One-terminal diol-modified polydimethylsiloxane (product name "X-22-176DX" manufactured by Shin-Etsu Chemical Co., Ltd.); 0.04 g "X-22-176DX" corresponds to the compound (D1).

[0093] <Light stabilizer> Hindered amine light stabilizer Adekastab LA-72 (ADEKA); 0.40g

[0094] In Drug C, the solids ratio of oxyethylene / oxypropylene copolymer polyol, polyethylene glycol, acrylic polyol, and 2,3-butanediol (hereinafter sometimes referred to as "EOPO:PEG1000:AP:2,3-BD ratio") was "EOPO:PEG1000:AP:2,3-BD=50:8:30:12."

[0095] The above-mentioned agents A, B, and C were mixed, and 0.04 g of dibutyltin dilaurate (hereinafter also referred to as DBTDL) was added as a curing catalyst to prepare 102.31 g of a coating solution.

[0096] When the total amount of the coating agent (coating liquid) for forming an anti-fogging film was taken as 100 mass %, the amount of urethane-forming components in the coating liquid was 40 mass %. The amount of the leveling agent was 0.0003 times the total amount of the coating liquid in terms of mass ratio. Number of isocyanate groups in the urethane-forming component, n (NCO) and the number of hydroxyl groups in the urethane-forming component, n (OH) The ratio of n (NCO) / n (OH) was 1.35. The content of polyisocyanate (A) in the coating liquid was 41.9% by mass relative to 100% by mass of the urethane-forming components.

[0097] (2) Preparation of the substrate A mirror was prepared by forming a silver film on the back of a rectangular soda-lime glass plate measuring 200 mm x 300 mm x 5 mm (thickness) using a conventional method. A mixed solution of 89 g of ion-exchanged water, 10 g of propanol, and 1 g of silane coupling agent, 3-(2-aminoethylamino)propyltrimethoxysilane (manufactured by Tokyo Chemical Industry Co., Ltd.), was prepared. The mixed solution was applied by wiping the glass surface of the mirror with a wiper (trade name "Bencotto", model M-1, 50 mm x 50 mm, manufactured by Ozu Industries Co., Ltd.) made of cellulose fiber impregnated with the mixed solution. The mirror was then washed with water to form a primer layer (a layer containing the silane coupling agent) on it, providing a substrate for the mirror.

[0098] (3) Manufacture of anti-fogging articles The coating solution was spin-coated onto the primer layer-formed surface of the substrate to form a coating film, which was then heat-treated at about 160°C for about 10 minutes to obtain an anti-fogging article having an anti-fogging coating with a thickness of 25 µm. The evaluation results of the anti-fogging article of this example were good, as shown in Table 1.

[0099] [Example 2] An anti-fogging article was obtained in the same manner as in Example 1, except that the content of the water repellent (D) (X-22-176DX) in Example 1 was changed to the value shown in Table 1. The evaluation results of the anti-fogging article of this example were good, as shown in Table 1.

[0100] [Example 3] An anti-fogging article was obtained in the same manner as in Example 1, except that the thickness of the anti-fogging coating was changed to 35 μm. The evaluation results of the anti-fogging article of this example were good, as shown in Table 1.

[0101] [Example 4] n (NCO) / n (OH) An anti-fogging article was obtained by the same procedure as in Example 1, except that the value was changed to 1.8. The evaluation results of the anti-fogging article of this example were good as shown in Table 1.

[0102] [Example 5] An anti-fogging article was obtained in the same manner as in Example 1, except that the water repellent (D) in Example 1 was replaced with a perfluoropolyether having a silyl group with an alkoxy group at one end (trade name "KY-108" manufactured by Shin-Etsu Chemical Co., Ltd.). "KY-108" corresponds to compound (D3). The evaluation results of the anti-fogging article of this example were good, as shown in Table 1.

[0103] [Example 6] An anti-fogging article was obtained in the same manner as in Example 1, except that an adduct-type blocked isocyanate (trade name "Burnoc D-550" manufactured by DIC) was used as the blocked polyisocyanate (H). The evaluation results of the anti-fogging article of this example were good, as shown in Table 1.

[0104] [Example 7] An anti-fogging article was obtained in the same manner as in Example 1, except that a dimer polyisocyanate (trade name "Desmodur N3400" manufactured by Sumika Covestro Urethane, functional group number 2.4) was used as the polyisocyanate (A). The evaluation results of the anti-fogging article of this example were good, as shown in Table 1.

[0105] [Example 8] An anti-fogging article was obtained by the same procedure as in Example 1, except that the blocked polyisocyanate (H) was not used. The evaluation results of the anti-fogging article of this example were generally good as shown in Table 1, but the anti-fogging properties were inferior to those of Example 1.

[0106] [Comparative Example 1] An anti-fogging article was obtained by the same procedure as in Example 1, except that the water repellent (D) and the blocked polyisocyanate (H) were not used. As shown in Table 1, the evaluation results of the anti-fogging article of this comparative example were inferior to those of the examples in terms of anti-fogging properties and water stain removal properties (anti-fouling properties).

[0107] The content of the water repellent agent (D) in Table 1 below is the value relative to 100% by mass of the urethane-forming components.

[0108] [Table 1] [Industrial Applicability]

[0109] The anti-fogging article of the present disclosure can be used for architectural purposes such as mirrors and window glass for bathrooms, vanities, etc., and for vehicle, ship, aircraft, etc. window glass or mirrors, specifically, rearview mirrors, door mirrors, etc. In addition, the anti-fogging article can also be used for lenses of eyeglasses and cameras, goggles, helmet shields, openings and peepholes in refrigerated showcases, freezer showcases, testing machines, precision instrument cases, etc., road reflectors, displays of mobile communication devices such as mobile phones, etc.

Claims

1. (A) a polyisocyanate having two or more isocyanate groups; (B) a polyol having an oxyethylene unit as a repeating unit and having two or more hydroxy groups in the molecule; (C) an acrylic resin having two or more hydroxy groups in the molecule; (D) a water repellent; (E) a solvent; (H) a blocked polyisocyanate having two or more blocked isocyanate groups; Including, The water repellent (D) comprises at least one compound selected from the group consisting of the following (D1), (D2), and (D3): (D1) A dialkylsiloxane moiety (SiR ２ O and R each independently represent a linear or branched alkyl group having 1 to 10 carbon atoms) is an average of 5 to 400. (D2) Fluoroalkylsilane having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having a fluorocarbon moiety. (D3) A perfluoropolyether having at least one group selected from the group consisting of a hydroxy group, a functional group that generates a hydroxy group upon hydrolysis, a carboxy group, an amino group, and an isocyanate group, and having a fluorocarbon moiety.

2. 2. The coating agent for forming an anti-fogging coating according to claim 1, wherein the polyol (B) comprises (B1) polyethylene glycol and (B2) a copolymer polyol having an oxyethylene unit and an oxypropylene unit as repeating units.

3. The coating agent for forming an anti-fogging film according to claim 1 or 2, further comprising (F) polytetramethylene ether glycol.

4. The coating agent for forming an anti-fogging film according to any one of claims 1 to 3, further comprising (G) a short-chain polyol having a number average molecular weight of 60 to 200.

5. 5. The coating agent for forming an anti-fogging film according to claim 1, wherein the content of the water repellent (D) is 0.01 to 10.0% by mass relative to 100% by mass of the urethane-forming components.

6. The number of isocyanate groups in the urethane-forming component, n （ＮＣＯ） and the number of hydroxyl groups in the urethane-forming component, n （ＯＨ） The ratio of （ＮＣＯ） / n （ＯＨ） The coating agent for forming an anti-fogging film according to any one of claims 1 to 5, wherein the viscosity is 1.0 to 3.

0.

7. 7. The coating agent for forming an anti-fogging coating according to claim 1, wherein the content of the polyol (B) is 15 to 35% by mass relative to 100% by mass of the urethane-forming components.

8. The coating agent for forming an anti-fogging film according to any one of claims 1 to 7, wherein the content of the acrylic resin (C) is 5 to 20% by mass relative to 100% by mass of the urethane-forming components.

9. A method for producing an anti-fogging article having a substrate and an anti-fogging coating, comprising: A step (1) of applying the anti-fogging coating agent according to any one of claims 1 to 8 to the surface of a substrate to form a coating film; a step (2) of evaporating the solvent (E) from the coating film and curing the coating film to form an anti-fogging coating; A method for manufacturing an anti-fogging article, comprising:

10. the substrate is a glass substrate, The method for producing an anti-fogging article according to claim 9, wherein a silane coupling agent having an amino group is applied to the surface of the glass substrate.

11. 11. The method for producing an anti-fogging article according to claim 9 or 10, wherein in the step (2), an isocyanate group of the polyisocyanate (A) reacts with a hydroxy group of the polyol (B) and the acrylic resin (C) to form a polyurethane.

12. The method for producing an anti-fogging article according to any one of claims 9 to 11, wherein in the step (2), the coating film is heated at 80 to 170°C.

13. An anti-fogging article having a substrate and an anti-fogging coating, The anti-fogging coating is a coating containing a polyurethane resin that is a cured product of the coating agent for forming an anti-fogging coating according to any one of claims 1 to 8, The anti-fogging coating has a thickness of 5 μm to 50 μm. Anti-fog articles.

14. 14. The anti-fogging article according to claim 13, wherein the anti-fogging coating has a pencil hardness of 2H or more.

15. the substrate is a glass substrate, The anti-fogging article according to claim 13 or 14, wherein a silane coupling agent having an amino group is applied to the surface of the glass substrate.

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