JP2022178714A - Composition for coating containing (poly)glycerol monomer - Google Patents

Abstract

To provide a composition for coating that enables substrates such as glass and plastic to have water-repellent and anti-fogging performances in a sustained manner.SOLUTION: A composition for coating contains: a (poly)glycerol monomer that has a (poly)glycerol skeleton with an average degree of polymerization of 1-100, with its end having a polymerizable functional group; and a water-repellent monomer.SELECTED DRAWING: None

Description

The present invention relates to coating compositions.

Base materials such as glass and plastic have high transparency and are used for optical films, glasses, lenses, etc. However, under high temperature and high humidity conditions or conditions with large temperature differences, dew condensation forms on the base material surface, resulting in cloudiness and visibility. is a problem.

A common method for preventing such a clouding phenomenon is to prepare a coating film that imparts an anti-fogging effect to the substrate surface. A method of applying a solution containing a hydrophilic polymer to make the surface hydrophilic and prevent the formation of water droplets has been disclosed (Patent Document 1).

However, since the anti-fogging composition of Patent Document 1 is highly hydrophilic, the film has low water resistance, and there is a problem that the effect is lost when washed away with water. As another method, there is a method of making the surface of the coating film superhydrophobic to improve the slipping property of water droplets (Patent Document 2), but fine water droplets adhere to the surface of the coating film, and a clouding phenomenon is confirmed. Sometimes.

JP-A-03-215589 JP 2012-219071 A

An object of the present invention is to provide a coating composition having both water repellency and antifogging properties.

As a result of intensive studies by the present inventors, a (poly)glycerin-based monomer (A) having a (poly)glycerin skeleton with an average degree of polymerization of 1 to 100 and a polymerizable functional group at the end and a water-repellent monomer (B) ) to solve the above problems, and completed the present invention.

The coating resin composition containing the (poly)glycerin-based monomer of the present invention imparts both water repellency and antifogging properties to substrates such as glass and plastics, and exhibits excellent persistence of the antifogging effect.

Hereinafter, the present invention will be described based on embodiments, but the scope of the present invention is not limited to these embodiments, and the present invention also includes forms modified within the scope of the present invention. . In addition, "-" representing a range includes an upper limit and a lower limit.

The (poly)glycerin-based monomer (A) according to the present invention has a (poly)glycerin skeleton with an average degree of polymerization of 1 to 100, and a polymerizable functional group at the end. (Poly)glycerin represents glycerin or polyglycerin.

The (poly)glycerin according to the present invention has an average degree of polymerization of 1-100, preferably 2-20, most preferably 2-15. Here, the average degree of polymerization is calculated from the following formula (2) and the following formula (3) from the hydroxyl value obtained by the terminal analysis method. The hydroxyl value in formula (3) is a numerical value that is an index of the number of hydroxyl groups contained in (poly)glycerin, and the amount of acetic acid required to acetylate the free hydroxyl groups contained in 1 g of (poly)glycerin. milligrams of potassium hydroxide required to neutralize The number of milligrams of potassium hydroxide is calculated according to "Japan Oil Chemists' Society, Standard Fat Analysis Test Method, 2013 Edition" edited by the Japan Oil Chemists' Society.
Molecular weight = 74n + 18 (2)
Hydroxyl value = 56110 (n + 2) / molecular weight (3)

Although the polymerizable functional group according to the present invention is not particularly limited, an alkoxysilyl group, a silanol group, an alkenyl group such as an allyl group or a vinyl group, an alkenyloxy group such as an allyloxy group or a vinyloxy group, a (meth)acryloyl group, an epoxy group , an isocyanate group, and the like. Among them, alkoxysilyl groups, allyl groups, and vinyl groups exhibit the effects of the present invention more effectively.

The (poly)glycerin-based monomer (A) according to the present invention includes (poly)glycerin or a (poly)glycerin derivative having a first reactive functional group at the terminal and a polymerizable compound having a second reactive functional group. is preferably a reaction product obtained by reacting

The (poly)glycerin or (poly)glycerin derivative having the first reactive functional group at the terminal is preferably a compound represented by the structure of formula (1) below.

（ｎ、ｐ、ｑ、ｒはそれぞれ繰り返し単位の数を表し、ｎは１～１００の整数、ｐ、ｑ、ｒはそれぞれ０～５０の整数である。ＡＯは炭素数１～４のアルキレンオキサイドを示す。Ｒ１は同一又は異なって、水素、もしくは、チオール基、（メタ）アクリロイル基、エポキシ基、アリル基からなる群より選ばれるいずれかを末端に含む反応性官能基である。）

(n, p, q, r each represent the number of repeating units, n is an integer of 1 to 100, p, q, r are each an integer of 0 to 50. AO is an alkylene oxide having 1 to 4 carbon atoms R1 is the same or different and is a reactive functional group containing at its end either hydrogen or selected from the group consisting of a thiol group, a (meth)acryloyl group, an epoxy group and an allyl group.)

Examples of AO include ethylene oxide (EO), propylene oxide (PO) and butylene oxide (BO), preferably ethylene oxide (EO). Each of p, q, and r described in formula (1) represents the average number of additions of alkylene oxide to one hydroxyl group of polyglycerol, and each is preferably 0-50, more preferably 1-20. Further, the sum of p, q, and r (p+q+r) is more preferably 1-130, more preferably 5-120.

Specific examples of (poly)glycerin or (poly)glycerin derivative having a first reactive functional group include (poly)glycerin, (poly)glycerin alkylene oxide adduct, (poly)glycerin (alkylene oxide) thioglycolic acid ester, (poly)glycerin (alkylene oxide) 3-mercaptopropionate, (poly)glycerin (alkylene oxide) (meth)acrylate, (poly)glycerin (alkylene oxide) (poly)glycidyl ether, (poly)glycerin (alkylene) oxide) (poly) allyl ether and the like.

Although the second reactive functional group is not particularly limited, examples thereof include vinyl group, allyl group, isocyanate group, thiol group, (meth)acryloyl group, epoxy group, hydroxyl group, amino group, hydrosilyl group and the like. Polymerizable compounds having a second reactive functional group include vinyltrimethoxysilane, vinyltriethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-isocyanatopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3 - mercaptopropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxy Propylmethyldiethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-aminopropyltrimethoxysilane, 3-hydroxypropyltriethoxysilane, 3-aminopropyltriethoxysilane, trimethoxysilane , triethoxysilane, dimethoxymethylsilane, diethoxymethylsilane, allyl glycidyl ether, diallyl glycidyl glycerin, allyl glycidyl phthalate, allyl glycidyl hexahydrophthalate, 1,2-epoxy-4-vinylcyclohexane, allyl mercaptan, polyethylene glycol allyl ether , polyethylene glycol diallyl ether, allyldimethylamine, diallylmethylamine, and the like.

The (poly)glycerin-based monomer (A) of the present invention comprises a first reactive functional group contained at the end of (poly)glycerin or a (poly)glycerin derivative and a second reactive functional group contained in the polymerizable compound. It is preferable that the group is reacted. Furthermore, it is obtained by reacting the second reactive functional group at the end of the polymerizable compound. Specifically, polymerization containing (poly)glycerin, (poly)glycerin alkylene oxide adduct, or (poly)glycerin derivative having a thiol group at the end, and any of a vinyl group, an isocyanate group, an epoxy group, and an amino group reaction product with a volatile compound; (poly)glycerin derivative having a (meth)acryloyl group or allyl group at the end and vinyl group, allyl group, thiol group, (meth)acryloyl group, or hydrosilyl group A reaction product with a polymerizable compound; a reaction product between a (poly)glycerin derivative having an epoxy group at its end and a polymerizable compound containing any one of a thiol group, a hydroxyl group and a hydrosilyl group. In the resulting reaction product, 20 to 100% of the first reactive functional groups of the (poly)glycerin or (poly)glycerin derivative are reacted and bonded. more preferably 50-100% of the first reactive functional groups are reacted and attached.

The water-repellent monomer (B) of the present invention is a water-repellent monomer containing at least one of a fluorine-based compound and a silicone-based compound. Examples include acrylates, silanes, siloxanes, alkoxysilanes, methoxy group-containing silicone resins, methyl-based silicone resins, methylphenyl-based silicone resins, and the like having fluoroalkyl groups, fluoroalkyl ether groups, and fluoroalkenyl groups.

The molecular weight of (B) is not particularly limited and can be appropriately selected depending on the purpose.

The amount of (B) in the coating composition of the present invention is 0.01% by mass or more and 10% by mass or less, preferably 0.01% by mass or more and 5% by mass or less, relative to (A). 01% by mass or more and 1% by mass or less is more preferable. When the blending amount of (B) is 0.01% by mass or more, water repellency is exhibited. Further, when the amount of (B) is 10% by mass or less, whitening and cloudiness do not occur on the surface of the coating film, resulting in excellent antifogging properties.

The coating composition of the present invention may contain silicate monomers such as TMOS and TEOS, silicate oligomers such as methyl silicate and ethyl silicate, polysilsesquioxane, and the like, as long as the effects of the present invention are not impaired.

Further, other additives may be added to the coating composition of the present invention. Such additives include ultraviolet absorbers, colorants, pigments, antioxidants, anti-yellowing agents, bluing agents, antifoaming agents, thickeners, anti-settling agents, antistatic agents, surfactants, Examples include adhesion promoters, infrared absorbers, light stabilizers, and the like.

Furthermore, the coating composition of the present invention may be mixed with an organic solvent. For example, alcohols include methanol, ethanol, butanol, isobutanol, isopropyl alcohol, propanol, t-butanol, sec-butanol, benzyl alcohol, and ketones include acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, Cyclohexanone, diacetone alcohol, esters such as ethyl acetate, methyl acetate, butyl acetate, sec-butyl acetate, methoxybutyl acetate, amyl acetate, propyl acetate, isopropyl acetate, ethyl lactate, methyl lactate, butyl lactate, ethers is isopropyl ether, methyl cellosolve, ethyl cellosolve, butyl cellosolve, glycols are ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, glycol esters are ethylene glycol monoethyl ether acetate, methoxypropyl acetate, butyl carbitol Acetate, ethyl carbitol acetate, glycol ethers include diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, butyl diglycol, methyltriglycol, 1-methoxy-2-propanol, propylene glycol monobutyl ether, 3-methoxy-3-methyl -1-butanol, diethylene glycol monohexyl ether, propylene glycol monomethyl ether propionate, dipropylene glycol methyl ether, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, aromatic hydrocarbons such as benzene, Toluene and xylene are mentioned. These organic solvents can be used alone or in combination of two or more.

A cured coating film can be produced by applying the coating composition of the present invention to various substrates and curing the composition. The curing method is not particularly limited, but known methods such as photocuring, heat curing, and curing by sol-gel reaction can be used depending on the reactive group of the coating composition.

When the coating composition of the present invention is cured by light or heat, it is preferable to use a polymerization initiator.

Although the photopolymerization initiator is not particularly limited, benzyl ketals such as 2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydroxycyclohexylphenyl ketone, 1-[4-(2-hydroxyethoxy ) Phenyl]-2-hydroxy-2-methyl-1-propan-1-one, α-hydroxyacetophenones such as 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2-benzyl-2- Aminoacetophenones such as dimethylamino-1-(4-morpholinophenyl)butanone-1, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, bis(2, 4,6-trimethylbenzoyl)phenylphosphine oxide, bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, acylphosphine oxides such as monoacylphosphine oxide, benzoin, benzoin benzoins such as methyl ether, benzoin ethyl ether, benzoin butyl ether, benzoin isopropyl ether; benzophenones such as benzophenone, methylbenzophenone, 4,4'-bisdiethylaminobenzophenone, 4-benzoyl-4'-methyldiphenylsulfide; typified by photoradical polymerization initiators such as thioxanthones such as diethylthioxanthone, 2-chlorothioxanthone and 2-isopropylthioxanthone, onium salt compounds such as diazonium salts, iodonium salts, sulfonium salts and phosphonium salts, and iron arene complexes. photocationic polymerization initiators (photoacid generators) such as organometallic complexes, carbocation salts such as tropylium, oxime ester compounds, ammonium compounds, benzoin compounds, dimethoxybenzyl urethane compounds, orthonitrobenzyl Photoanionic polymerization initiators (photobase generators) such as urethane-based compounds are included. The amount of the photopolymerization initiator used is not particularly limited, but in general, 0.1 to 10 parts by weight is used with respect to 100 parts by weight of the total amount of the (poly)glycerin-based monomer and the water-repellent monomer constituting the coating composition. preferable.

Thermal polymerization initiators include azo compounds typified by 2,2'-azobisbutyronitrile (AIBN), thermal radical polymerization initiators such as peroxides typified by benzoyl peroxide (BPO), benzenesulfone Examples thereof include thermal cationic polymerization initiators such as acid esters and alkylsulfonium salts. The amount of the thermal polymerization initiator to be used is not particularly limited, but is generally 0.1 to 20 parts by weight with respect to 100 parts by weight of the total amount of the (poly)glycerin-based monomer and the water-repellent monomer constituting the coating composition. preferable.

When the coating composition of the present invention is cured by a sol-gel reaction, water necessary for hydrolysis of the metal alkoxide is added. In addition, it is preferable to use a catalyst to promote the hydrolysis and polycondensation reaction of the metal alkoxide, and the catalyst may be an acid catalyst or an alkali catalyst used in the conventional sol-gel method. Acid catalysts include hydrochloric acid, nitric acid, sulfuric acid, formic acid, organic acids, photoacid generators and the like. Examples of alkali catalysts include inorganic base compounds such as metal hydroxides and ammonia, organic base compounds such as amines and phosphines, and photobase generators.

The coating composition of the present invention can be suitably used as a water-repellent and anti-fogging agent, an anti-condensing agent, and a stress relaxation agent. A cured coating film obtained by curing such a coating composition has excellent anti-fogging properties for substrates such as glass and plastics, and is used for automobile windshields, lamp covers, camera lenses, goggles, etc. is suitably used as an anti-fogging coating agent.

The present invention will be described below with reference to examples, but the present invention is not limited by these examples.

[Synthesis Example 1]
A reaction vessel equipped with a thermometer and a stirrer was charged with 425 g of EO60 mol adduct of tetraglycerin, 210 g of 3-isocyanatopropyltriethoxysilane (manufactured by TCI), and 0.13 g of dibutyltin dilaurate, and stirred at 40° C. for 4 hours. and 635 g of compound (A1) was obtained. Note that 100% of the hydroxyl groups at the ends of the polyglycerol derivative were reacted.

[Synthesis Example 2]
A reaction vessel equipped with a thermometer and a stirrer was charged with 80 g of EO60 mol adduct of tetraglycerin, 20 g of 3-isocyanatopropyltriethoxysilane (manufactured by TCI), and 0.01 g of dibutyltin dilaurate, and stirred at 60° C. for 6 hours. and 100 g of compound (A2) was obtained. Note that 50% of the hydroxyl groups at the ends of the polyglycerol derivative were reacted.

[Synthesis Example 3]
A reaction vessel equipped with a thermometer and a stirrer was charged with 37 g of EO 12 mol adduct of tetraglycerin, 63 g of 3-isocyanatopropyltriethoxysilane (manufactured by TCI), and 0.01 g of dibutyltin dilaurate, and stirred at 60° C. for 5 hours. and 100 g of compound (A3) was obtained. Note that 100% of the hydroxyl groups at the ends of the polyglycerol derivative were reacted.

[Synthesis Example 4]
A reaction vessel equipped with a thermometer and a stirrer was charged with 66 g of EO40 mol adduct of diglycerin, 34 g of 3-isocyanatopropyltriethoxysilane (manufactured by TCI), and 0.01 g of dibutyltin dilaurate, and stirred at 60° C. for 12 hours. and 100 g of compound (A4) was obtained. Note that 100% of the hydroxyl groups at the ends of the polyglycerol derivative were reacted.

[Synthesis Example 5]
A reaction vessel equipped with a thermometer and a stirrer was charged with 66 g of EO 120 mol adduct of decaglycerin, 34 g of 3-isocyanatopropyltriethoxysilane (manufactured by TCI), and 0.01 g of dibutyltin dilaurate, and stirred at 40°C for 4 hours. and 100 g of compound (A5) was obtained. Note that 100% of the hydroxyl groups at the ends of the polyglycerol derivative were reacted.

[Synthesis Example 6]
Into a reaction vessel equipped with a thermometer, a stirrer and a Dean-Stark apparatus, 764 g of EO60 molar adduct of tetraglycerin (polyglycerin with an average degree of polymerization of 4), 163 g of 3-mercaptopropionic acid, 900 g of toluene and 45 g of p-toluenesulfonic acid. was charged, the temperature was raised to a toluene reflux atmosphere while stirring, and dehydration condensation reaction was carried out over about 6 hours. After completion of the reaction, the reaction mixture was neutralized with sodium hydrogencarbonate and extracted with ethyl acetate:toluene=50:50. By distilling off the organic layer under reduced pressure, 367 g of 3-mercaptopropionate of tetraglycerol EO 60 mol adduct was obtained. In a reactor equipped with a stirrer, 319 g of 3-mercaptopropionate of tetraglycerin EO 60 mol adduct and 81 g of vinyltrimethoxysilane were charged and stirred for 45 minutes while irradiating with UV light to obtain 400 g of compound (A6). rice field. Note that 100% of the hydroxyl groups at the ends of the polyglycerol derivative were reacted.

[Synthesis Example 7]
A reaction vessel equipped with a thermometer and a stirrer was charged with 10 g of EO 12 mol adduct of tetraglycerin, 16.7 g of 50% thorium hydroxide aqueous solution, and 2.24 g of tetrabutylammonium bromide and stirred at 40°C. 25.3 g of allyl bromide was added dropwise thereto, and the mixture was stirred for 22 hours while being heated at 40°C. After completion of the reaction, extraction was performed with toluene, and the solvent was distilled off under reduced pressure to synthesize an allyl ether of 12 mol of EO adduct of tetraglycerin. Subsequently, 10.0 g of allyl ether of EO 12 mol adduct of tetraglycerol and 6.22 g of triethoxysilane were charged and stirred at room temperature in the presence of Karstedt's catalyst to obtain 16 g of compound (A7).

[Synthesis Example 8]
A screw tube was charged with 9.10 g of silicon-containing fluororesin, 32.2 g of ethyl acetate, 0.28 g of 3-isocyanatopropyltriethoxysilane (manufactured by TCI), and 100 ppm of dibutyltin dilaurate (relative to theoretical yield), and the mixture was heated at 40° C. for 24 hours. By stirring, 42 g of compound (B1) having a concentration of 5 wt % was obtained.

<Example 1>
1.0 g of compound (A1), 0.20 g of a 5 wt % ethyl acetate solution of compound (B1), 1.0 g of 1-methoxy-2-propanol, 0.37 g of water, and 0.3 g of formic acid are uniformly stirred and mixed, A coating composition was obtained. Then, the above coating composition is applied to a glass plate (76 mm × 52 mm × 1.2 mm) that has been subjected to a hydrophilic treatment, air-dried at room temperature for 1 hour, and then heated and dried at 150 ° C. for 30 minutes to obtain a film thickness. A cured coating film having a thickness of about 27 µm was obtained. The glass plate was immersed in an alkaline solution (mixed solution of 500 mL of isopropanol, 41.6 g of potassium hydroxide, and 83.3 g of ion-exchanged water) for 15 hours and washed with a 0.2 mol/L hydrochloric acid aqueous solution and ion-exchanged water. Hydrophilic treatment was performed by

The resulting cured coating film was evaluated for water repellency and antifogging properties as follows.
(water repellency)
The water repellency was evaluated by the water contact angle on the surface of the cured coating film. Using a contact angle measurement device (Drop Master DM500, manufactured by Kyowa Interface Science Co., Ltd.), 1 μL of ion-exchanged water was dropped on the cured coating film, and the contact angle was measured 60 seconds after the contact with the liquid.
(Anti-fogging property)
The cured coating film was placed 2.0 cm above the liquid surface of water adjusted to a temperature of 50° C., and whether or not the cured coating film became cloudy was visually evaluated, and the time at which the coating film started to become cloudy was measured.

<Examples 2 to 7>
A coating composition and a cured coating film were prepared in the same manner as in Example 1 except that the compound (A1) used in Example 1 was changed to compounds (A2) to (A7) and the amount of water was changed accordingly. It was prepared and evaluated for water repellency and antifogging properties.

<Example 8>
A coating composition and a cured coating were prepared in the same manner as in Example 1 except that the amount of compound (B1) used in Example 1 was changed from 1 part to 0.3 parts, and the amount of water was changed accordingly. A film was prepared and evaluated for water repellency and antifogging properties.

<Example 9>
A coating composition and a cured coating film were prepared in the same manner as in Example 1, except that the amount of compound (B1) used in Example 1 was changed from 1 part to 2 parts, and the amount of water was accordingly changed. It was prepared and evaluated for water repellency and antifogging properties.

<Reference example 1>
1.0 g of compound (A1), 1.0 g of 1-methoxy-2-propanol, 0.37 g of water and 0.3 g of formic acid were uniformly stirred and mixed to obtain a coating composition. Then, the above coating composition is applied to a glass plate (76 mm × 52 mm × 1.2 mm) that has been subjected to a hydrophilic treatment, air-dried at room temperature for 1 hour, and then heated and dried at 150 ° C. for 30 minutes to obtain a film thickness. A cured coating film having a thickness of about 30 µm was obtained. The resulting cured coating film was evaluated for water repellency and antifogging properties in the same manner as in Examples 1-9.

Tables 1 and 2 show the formulations and evaluation results of Examples 1 to 9 and Reference Example 1.

Example 1, which is a cured coating film of a coating composition comprising the (poly)glycerin-based monomer (A) and the water-repellent monomer (B) of the present invention, is a reference example comprising only the (poly)glycerin-based monomer (A). Compared to No. 1, it had higher water repellency and anti-fogging properties. Further, it was confirmed that Examples 2 to 7, in which the structure of the (poly)glycerin-based monomer (A) was changed, also provided similar performance. Furthermore, similar effects were obtained when the amount of the water-repellent monomer (B) added was changed. From the above evaluation results, it was clarified that the cured coating film obtained from the coating composition of the present invention has moisture absorption and release properties, and has both water repellency and antifogging properties.

Claims (8)

A coating characterized by containing a (poly)glycerin-based monomer (A) having a (poly)glycerin skeleton with an average degree of polymerization of 1 to 100 and having a polymerizable functional group at the end, and a water-repellent monomer (B). composition. (A) is a reaction product obtained by reacting a (poly)glycerin or (poly)glycerin derivative having a first reactive functional group at the terminal with a polymerizable compound having a second reactive functional group, , wherein the first reactive functional group and the second reactive functional group are reacted. 3. The coating composition according to claim 2, wherein the (poly)glycerin or (poly)glycerin derivative having the first reactive functional group at the terminal is represented by the structure of the following formula (1): .

(n, p, q, r each represent the number of repeating units, n is an integer of 1 to 100, p, q, r are each an integer of 0 to 50. AO is an alkylene oxide having 1 to 4 carbon atoms R1 is the same or different and is a reactive functional group containing at its end either hydrogen or selected from the group consisting of a thiol group, a (meth)acryloyl group, an epoxy group and an allyl group.) The second reactive functional group is one selected from the group consisting of a vinyl group, an allyl group, an isocyanate group, a thiol group, a (meth)acryloyl group, an epoxy group, an amino group, and a hydrosilyl group. The coating composition according to any one of claims 2 and 3. 5. The coating composition according to any one of claims 1 to 4, wherein one of the polymerizable functional groups is at least one of an alkoxysilyl group, an allyl group, and a vinyl group. 6. The coating composition according to any one of claims 1 to 5, wherein (B) is a water-repellent monomer containing at least one of a fluorine-based compound and a silicone-based compound. 7. The coating composition according to any one of claims 1 to 6, wherein the amount of (B) to (A) is 0.01% by mass or more and 10% by mass or less. A cured product formed by curing the coating composition according to any one of claims 1 to 7.