JP2021091764A - Coating agent, cured product and film - Google Patents

Abstract

To provide a coating agent, a cured product, and a film.SOLUTION: A coating agent contains: a hydroxy group-containing (meth) acryl co-polymer (A) having a glass transformation temperature of 30-110°C, and a hydroxyl value of 30-150 mgKOH/g; polyisocyanate (B); and one or more particles (C) selected from the group consisting of silica particles having a volume average particle diameter of 1.5-6.5 μm, and organic particles containing nitrogen atoms.SELECTED DRAWING: None

Description

The present disclosure relates to coating agents, cured products and films.

In this field, coating agents containing particles have been developed. For example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2018-027642) discloses a film produced by using such a coating agent.

Japanese Unexamined Patent Publication No. 2018-027642

However, the coating agent containing particles has a problem that the particles are settled or separated and the stability of the coating agent is deteriorated.

Further, in recent years, the base material of the coating agent tends to be thinned from the viewpoint of cost. Therefore, in order to prevent damage to the base material such as shrinkage when the coating agent is applied and then cured, the coating agent is required to be cured at a lower temperature (low temperature curability).

Further, in addition to stability and low-temperature curability, the coating agent is also required to have substrate adhesion to an untreated substrate and solvent resistance at the time of coating when the adherend is solvent-based.

Therefore, the problem to be solved by the present invention is to provide a coating agent having good stability, low temperature curability, substrate adhesion, and solvent resistance.

As a result of diligent studies, the present inventors have found that the above-mentioned problems can be solved by a coating agent containing a specific component.

The disclosure provides the following items:
(Item 1)
A hydroxyl group-containing (meth) acrylic copolymer (A) having a glass transition temperature of 30 to 110 ° C. and a hydroxyl value of 30 to 150 mgKOH / g.
One or more particles (C) selected from the group consisting of polyisocyanate (B), silica particles having a volume average particle diameter of 1.5 to 6.5 μm, and organic particles containing nitrogen atoms.
Including coating agent.
(Item 2)
The coating agent according to the above item, which comprises a hydroxyl group-containing organically modified silicone (D).
(Item 3)
A cured product of the coating agent described in the above item.
(Item 4)
A film containing the cured product according to the above item.

In the present disclosure, the above-mentioned one or more features may be provided in addition to the specified combinations.

The coating agent according to the present disclosure has good stability, low temperature curability, substrate adhesion, and solvent resistance.

Throughout the present disclosure, the range of numerical values such as each physical property value and content can be set as appropriate (for example, by selecting from the upper and lower limit values described in each of the following items). Specifically, for the numerical value α, when A1, A2, A3, A4 (A1> A2> A3> A4) and the like are exemplified as the upper and lower limits of the numerical value α, the range of the numerical value α is A1 or less. Examples thereof include A2 or less, A3 or less, A2 or more, A3 or more, A4 or more, A1 to A2, A1 to A3, A1 to A4, A2 to A3, A2 to A4, and A3 to A4.

[Coating agent]
The present disclosure discloses a hydroxyl group-containing (meth) acrylic copolymer (A) having a glass transition temperature of 30 to 110 ° C. and a hydroxyl value of 30 to 150 mgKOH / g.
One or more particles (C) selected from the group consisting of polyisocyanate (B), silica particles having a volume average particle diameter of 1.5 to 6.5 μm, and organic particles containing nitrogen atoms.
Provide coating agents, including.

<Hydroxy group-containing (meth) acrylic copolymer (A): Also referred to as (A) component. ＞
Examples of the hydroxyl group-containing (meth) acrylic copolymer include a copolymer containing a structural unit derived from a hydroxyl group-free alkyl (meth) acrylate and a structural unit derived from a hydroxyl group-containing alkyl (meth) acrylate. The component (A) may be used alone or in combination of two or more.

（式中、Ｒ^ａ１は水素原子、又はメチル基であり、Ｒ^ａ２はアルキル基である。）
で表わされる。水酸基非含有アルキル（メタ）アクリレートは、単独又は２種以上で使用され得る。 (Hydroxy group-free alkyl (meth) acrylate)
Hydroxy group-free alkyl (meth) acrylate is

(In the formula, ^Ra1 is a hydrogen atom or a methyl group, and ^Ra2 is an alkyl group.)
It is represented by. The hydroxyl group-free alkyl (meth) acrylate can be used alone or in combination of two or more.

Examples of the alkyl group include a linear alkyl group, a branched alkyl group, and a cycloalkyl group.

The linear alkyl group is _{represented by the general formula of −C n} H _{2n + 1} (n is an integer of 1 or more). The linear alkyl group includes a methyl group, an ethyl group, a propyl group, an n-butyl group, an n-pentyl group, an n-hexyl group, an n-heptyl group, an n-octyl group, an n-nonyl group, an n-decamethyl group and the like. Is exemplified.

A branched alkyl group is a group in which at least one hydrogen of a linear alkyl group is substituted with an alkyl group. Examples of the branched alkyl group include a diethylpentyl group, a trimethylbutyl group, a trimethylpentyl group, and a trimethylhexyl group.

Examples of the cycloalkyl group include a monocyclic cycloalkyl group, a crosslinked ring cycloalkyl group, and a condensed ring cycloalkyl group.

Examples of the monocyclic cycloalkyl group include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclodecyl group, a 3,5,5-trimethylcyclohexyl group and the like.

Examples of the crosslinked ring cycloalkyl group include a tricyclodecyl group, an adamantyl group, and a norbornyl group.

Examples of the fused ring cycloalkyl group include a bicyclodecyl group.

Examples of the hydroxyl group-free alkyl (meth) acrylate include a hydroxyl group-free linear alkyl (meth) acrylate, a hydroxyl group-free branched alkyl (meth) acrylate, and a hydroxyl group-free cycloalkyl (meth) acrylate.

The hydroxyl group-free linear alkyl (meth) acrylate includes methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, and hexyl (meth) acrylate. , (Meta) heptyl acrylate, (meth) octyl acrylate, (meth) hexadecyl acrylate, (meth) dodecyl acrylate, (meth) octadecyl acrylate, icosyl (meth) acrylate, docosyl (meth) acrylate, etc. Is exemplified.

Hydroxy group-free branched alkyl (meth) acrylates include isopropyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, tert-butyl (meth) acrylate, and 2-butyl (meth) acrylate. Ethylhexyl and the like are exemplified.

Examples of the hydroxyl group-free cycloalkyl (meth) acrylate include cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, cyclopentanyl (meth) acrylate, and isobornyl (meth) acrylate.

Among these, alkyl (meth) acrylates having an alkyl group having about 1 to 20 carbon atoms are preferable because they contribute to leveling property and adhesion. Further, by using a hydroxyl group-free alkyl (meth) acrylate having a different number of carbon atoms in the alkyl group in combination, the physical properties such as the glass transition temperature of the hydroxyl group-containing (meth) acrylic copolymer can be adjusted.

The upper and lower limits of the content of the constituent units derived from the hydroxyl group-free alkyl (meth) acrylate in 100 mol% of all the constituent units of the hydroxyl group-containing (meth) acrylic copolymer are 95, 90, 85, 80, 75, 70 and 65. Mol% and the like are exemplified. In one embodiment, the content is preferably 65-95 mol%.

The upper and lower limits of the content of the hydroxyl group-free alkyl (meth) acrylate-derived structural unit in 100% by mass of the total structural unit of the hydroxyl group-containing (meth) acrylic copolymer are 94, 90, 85, 80, 75 and 70% by mass. Etc. are exemplified. In one embodiment, the content is preferably 70 to 94% by mass.

（式中、Ｒ^ａ３は水素原子、又はメチル基であり、Ｒ^ａ４は直鎖アルキレン基、分岐アルキレン基、又はシクロアルキレン基である。）
で表わされる。水酸基含有アルキル（メタ）アクリレートは、単独又は２種以上で使用され得る。 (Hydroxy group-containing alkyl (meth) acrylate)
The hydroxyl group-containing alkyl (meth) acrylate has the following structural formula.

(In the formula, ^Ra3 is a hydrogen atom or a methyl group, and ^Ra4 is a linear alkylene group, a branched alkylene group, or a cycloalkylene group.)
It is represented by. The hydroxyl group-containing alkyl (meth) acrylate may be used alone or in combination of two or more.

Examples of the hydroxyl group-containing alkyl (meth) acrylate include a hydroxyl group-containing linear alkyl (meth) acrylate, a hydroxyl group-containing branched alkyl (meth) acrylate, and a hydroxyl group-containing cycloalkyl (meth) acrylate.

Examples of the hydroxyl group-containing linear alkyl (meth) acrylate include hydroxymethyl (meth) acrylate, hydroxyethyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate.

Examples of the hydroxyl group-containing branched alkyl (meth) acrylate include 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 3-hydroxybutyl (meth) acrylate.

Examples of the hydroxyl group-containing cycloalkyl (meth) acrylate include hydroxycyclohexyl (meth) acrylate and 4- (hydroxymethyl) cyclohexylmethyl (meth) acrylate.

The hydroxyl group-containing alkyl (meth) acrylate preferably has a hydroxyalkyl group having about 1 to 4 carbon atoms from the viewpoint of pot life and the like.

The upper and lower limits of the content of the constituent units derived from hydroxyl group-containing alkyl (meth) acrylate in 100 mol% of all the constituent units of the hydroxyl group-containing (meth) acrylic copolymer are 35, 32, 30, 25, 20, 18, 15, and so on. 10 and 5 mol% and the like are exemplified. In one embodiment, the content is preferably 5 to 35 mol%.

The upper and lower limits of the content of the constituent units derived from hydroxyl group-containing alkyl (meth) acrylate in 100% by mass of all the constituent units of the hydroxyl group-containing (meth) acrylic copolymer are 40, 35, 30, 25, 20, 19, 15, and so on. Examples include 10, 7, and 6% by mass. In one embodiment, the content is preferably 6-40% by mass.

The molar ratio of the hydroxyl group-free alkyl (meth) acrylate-derived structural unit to the hydroxyl group-containing alkyl (meth) acrylate-derived structural unit in the hydroxyl group-containing (meth) acrylic copolymer (hydroxyl group-free alkyl (meth) acrylate _mol / hydroxyl group-containing) The upper and lower limits of alkyl (meth) acrylate _mol ) are exemplified by 19, 17, 15, 13, 11, 10, 9, 7, 5, 3, 2, 1.9 and the like. In one embodiment, the molar ratio is preferably 1.9 to 19.

Mass ratio of the structural unit derived from the hydroxyl group-free alkyl (meth) acrylate in the hydroxyl group-containing (meth) acrylic copolymer to the structural unit derived from the hydroxyl group-containing alkyl (meth) acrylate (hydroxyl group-free alkyl (meth) acrylate _mass / hydroxyl group-containing The upper and lower limits of the alkyl (meth) acrylate _mass ) are exemplified by 16, 15, 13, 11, 10, 9, 7, 5, 3, 2, 1.8 and the like. In one embodiment, the mass ratio is preferably 1.8 to 16.

(Monomers other than hydroxyl group-free alkyl (meth) acrylates and hydroxyl group-containing alkyl (meth) acrylates: also referred to as other monomers)
When producing the hydroxyl group-containing (meth) acrylic copolymer, a monomer that does not correspond to either the hydroxyl group-free alkyl (meth) acrylate or the hydroxyl group-containing alkyl (meth) acrylate may be used. Other monomers may be used alone or in combination of two or more.

Other monomers include (meth) acrylic acid, α, β-unsaturated carboxylic acid, epoxy group-containing (meth) acrylate, styrenes, α-olefin, unsaturated alcohol, aryl (meth) acrylate, and dialkylaminoalkyl (meth). ) Acrylate and salts thereof, dialkylaminoalkyl (meth) acrylamide and salts thereof, chain transfer monomer, (meth) acrylonitrile, (meth) acrylamides, vinylamine, monofunctional monomer other than the above, bis (meth) acrylamide , Di (meth) acrylic ester, divinyl ester, bifunctional monomer other than the above, trifunctional monomer, tetrafunctional monomer and the like are exemplified.

The upper and lower limits of the content of the constituent units derived from other monomers in 100 mol% of the total constituent units of the hydroxyl group-containing (meth) acrylic copolymer are 20, 15, 10, 9, 5, 4, 1, 0.9, Examples include 0.5, 0.1, 0 mol% and the like. In one embodiment, the content is preferably 0 to 20 mol%.

The upper and lower limits of the content of the constituent units derived from other monomers in 100% by mass of the total constituent units of the hydroxyl group-containing (meth) acrylic copolymer are 20, 15, 10, 9, 5, 4, 1, 0.9, Examples include 0.5, 0.1, 0% by mass and the like. In one embodiment, the content is preferably 0 to 20% by mass.

The molar ratio of the constituent units derived from the hydroxyl group-free alkyl (meth) acrylate in the hydroxyl group-containing (meth) acrylic copolymer to the constituent units derived from other monomers (other monomer _mol / hydroxyl group-free alkyl (meth) acrylate _mol ). Examples of the upper limit and the lower limit are 0.30, 0.25, 0.20, 0.15, 0.10, 0.05, 0 and the like. In one embodiment, the molar ratio is preferably 0 to 0.30.

The mass ratio of the structural unit derived from the hydroxyl group-free alkyl (meth) acrylate in the hydroxyl group-containing (meth) acrylic copolymer to the structural unit derived from other monomers (other monomer _mass / hydroxyl group-free alkyl (meth) acrylate _mass ). Examples of the upper limit and the lower limit are 0.29, 0.25, 0.25, 0.15, 0.10, 0.05, 0 and the like. In one embodiment, the mass ratio is preferably 0 to 0.29.

Upper limit _{of molar ratio (other monomer mol} / hydroxyl group-containing alkyl (meth) acrylate _mol ) of the structural unit derived from the hydroxyl group-containing alkyl (meth) acrylate in the hydroxyl group-containing (meth) acrylic copolymer and the structural unit derived from other monomers Examples of the lower limit are 4, 3, 2, 1, 0.9, 0.7, 0.5, 0.3, 0.1, 0 and the like. In one embodiment, the molar ratio is preferably 0-4.

The upper limit _{of the mass ratio (other monomer mass} / hydroxyl group-containing alkyl (meth) acrylate _mass ) of the structural unit derived from the hydroxyl group-containing alkyl (meth) acrylate in the hydroxyl group-containing (meth) acrylic copolymer and the structural unit derived from other monomers and Examples of the lower limit are 3.3, 3, 2, 1, 0.7, 0.5, 0.3, 0.1, 0 and the like. In one embodiment, the mass ratio is preferably 0 to 3.3.

<Physical characteristics of hydroxyl group-containing (meth) acrylic copolymer>
The upper and lower limits of the glass transition temperature of the hydroxyl group-containing (meth) acrylic copolymer are 110, 100, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30 ° C., etc. Is exemplified. In one embodiment, the glass transition temperature is preferably 30 to 110 ° C.

The glass transition temperature is measured under appropriate conditions (heating rate: 10 ° C./min) using a commercially available differential scanning calorimetry instrument (for example, product name "DSC8230B", manufactured by Rigaku Denki Co., Ltd.).

The upper and lower limits of the hydroxyl value (solid content conversion) of the hydroxyl group-containing (meth) acrylic copolymer are 150, 145, 140, 135, 130, 125, 120, 115, 110, 105, 100, 95, 90, 85, 80. , 75, 70, 65, 60, 55, 50, 45, 40, 35, 30 mgKOH / g and the like. In one embodiment, the hydroxyl value (in terms of solid content) is preferably 30 to 150 mgKOH / g.

The hydroxyl value is measured by a method according to JIS K1557-1.

The upper and lower limits of the hydroxyl group equivalent of the hydroxyl group-containing (meth) acrylic copolymer are 2.4, 2, 1.9, 1.7, 1.5, 1.3, 1.0, 0.9, 0.7 meq /. G and the like are exemplified. In one embodiment, the hydroxyl group equivalent is preferably 0.7 to 2.4 meq / g.

In the present disclosure, the hydroxyl group equivalent is the amount of substance of the hydroxyl group present in 1 g of the solid.

Examples of the upper and lower limits of the acid value of the hydroxyl group-containing (meth) acrylic copolymer are 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0 meq / g and the like. Will be done. In one embodiment, the acid value is preferably 0 to 0.7 meq / g, particularly considering curability.

The acid value is measured by a method conforming to JIS K0070.

Examples of the upper and lower limits of the weight average molecular weight (Mw) of the hydroxyl group-containing (meth) acrylic copolymer are 100,000, 90000, 80000, 70000, 60000, 50000, 40000, 30000, 20000, 10000, 5000, 4000, 3000 and the like. .. In one embodiment, the weight average molecular weight (Mw) is preferably 3000 to 100,000, more preferably 1000 to 80,000.

Examples of the upper and lower limits of the number average molecular weight (Mn) of the hydroxyl group-containing (meth) acrylic copolymer are 100,000, 90000, 80000, 70000, 60000, 50000, 40000, 30000, 20000, 20000, 10000, 5000, 4000, 3000 and the like. .. In one embodiment, the number average molecular weight (Mn) is preferably 3000 to 100000, more preferably 1000 to 80,000.

The weight average molecular weight and the number average molecular weight can be determined as polystyrene-equivalent values measured in a suitable solvent by, for example, gel permeation chromatography (GPC).

Examples of the upper and lower limits of the molecular weight distribution (Mw / Mn) of the hydroxyl group-containing (meth) acrylic copolymer are 10, 9, 7.5, 5, 2.5, 2, 1.5 and the like. In one embodiment, the molecular weight distribution (Mw / Mn) is preferably 1.5 to 10.

The hydroxyl group-containing (meth) acrylic copolymer can be produced by various known methods. The method for producing a hydroxyl group-containing (meth) acrylic copolymer is usually a method of producing a hydroxyl group-free alkyl (meth) acrylate and a hydroxyl group-containing alkyl (meth) acrylate, and if necessary, other monomers in a solvent-free or organic solvent. An example is a method in which a copolymerization reaction is carried out at about 80 to 180 ° C. for about 1 to 10 hours in the presence of a polymerization initiator. Examples of the organic solvent and polymerization initiator used in producing the hydroxyl group-containing (meth) acrylic copolymer include those described below.

Examples of the upper and lower limits of the content of the hydroxyl group-containing (meth) acrylic copolymer in 100% by mass of the coating agent solid content are 70, 65, 60, 55, 50, 45, 40% by mass and the like. In one embodiment, the content is preferably 40 to 70% by mass.

<Polyisocyanate (B): Also referred to as (B) component. ＞
In the present disclosure, "polyisocyanate" is a compound having two or more isocyanate groups (-N = C = O).

Examples of the polyisocyanate include a linear aliphatic polyisocyanate, a branched aliphatic polyisocyanate, an alicyclic polyisocyanate, an aromatic polyisocyanate, and a biuret form, an isocyanurate form, an allophanate form, and an adduct form thereof. Polyisocyanates can be used alone or in combination of two or more.

Examples of the linear aliphatic group include a linear alkylene group. The linear alkylene group is represented by the general formula: _{− (CH 2} ) _n − (n is an integer of 1 or more). The linear alkylene group includes a methylene group, an ethylene group, a propylene group, an n-butylene group, an n-pentylene group, an n-hexylene group, an n-heptylene group, an n-octylene group, an n-nonylene group, an n-decamethylene group and the like. Is exemplified.

Examples of the linear aliphatic polyisocyanis include methylene diisocyanis, dimethylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, heptamethylene diisocyanate, octamethylene diisocyanate, nonamethylene diisocyanate, and decamethylene diisocyanis. To.

Examples of the branched aliphatic group include a branched alkylene group. A branched alkylene group is a group in which at least one hydrogen atom of a linear alkylene group is substituted with an alkyl group. Examples of the branched alkylene group include a diethylpentylene group, a trimethylbutylene group, a trimethylpentylene group, a trimethylhexylene group (trimethylhexamethylene group) and the like.

Examples of the branched aliphatic polyisocyanate include diethylpentylene diisocyanate, trimethylbutylene diisocyanate, trimethylpentylene diisocyanate, and trimethylhexamethylene diisocyanate.

Examples of the alicyclic group include a cycloalkylene group. Examples of the cycloalkylene group include a monocyclic cycloalkylene group, a crosslinked ring cycloalkylene group, and a condensed ring cycloalkylene group. Further, the cycloalkylene group may have one or more hydrogen atoms substituted with a linear or branched alkyl group.

In the present disclosure, the single ring means a cyclic structure formed by covalent bonds of carbon and having no bridging structure inside. Further, the condensed ring means a cyclic structure in which two or more monocycles share two atoms (that is, only one side of each ring is shared (condensed) with each other). The crosslinked ring means a cyclic structure in which two or more monocycles share three or more atoms.

Examples of the monocyclic cycloalkylene group include a cyclopentylene group, a cyclohexylene group, a cycloheptylene group, a cyclodecylene group, a 3,5,5-trimethylcyclohexylene group and the like.

Examples of the crosslinked ring cycloalkylene group include a tricyclodecylene group, an adamantylene group, a norbornene group and the like.

Examples of the fused ring cycloalkylene group include a bicyclodecylene group.

Examples of the alicyclic polyisocyanate include monocyclic alicyclic polyisocyanates, crosslinked alicyclic polyisocyanates, and condensed alicyclic polyisocyanates.

The monocyclic alicyclic polyisocyanate includes hydrogenated xylene diisocyanate, isophorone diisocyanate, cyclopentylene diisocyanate, cyclohexylene diisocyanate, cycloheptylene diisocyanate, cyclodecylene diisocyanate, 3,5,5-trimethylcyclohexylene diisocyanate, and dicyclohexylmethane. Examples thereof include diisocyanate.

Examples of the crosslinked alicyclic polyisocyanate include tricyclodecylene diisocyanate, adamantane diisocyanate, and norbornene diisocyanate.

Examples of the condensed alicyclic polyisocyanate include bicyclodecylene diisocyanate.

Examples of the aromatic group include a monocyclic aromatic group and a condensed ring aromatic group. Further, the aromatic group may have one or more hydrogen atoms substituted with a linear or branched alkyl group.

Examples of the monocyclic aromatic group include a phenyl group (phenylene group), a tolyl group (tolyl group), and a mesitylene group (mesitylene group). Examples of the fused ring aromatic group include a naphthyl group (naphthylene group) and the like.

Examples of the aromatic polyisocyanate include monocyclic aromatic polyisocyanate and condensed ring aromatic polyisocyanate.

The monocyclic aromatic polyisocyanate includes dialkyldiphenylmethane diisocyanate such as 4,4'-diphenyldimethylmethane diisocyanate, tetraalkyldiphenylmethane diisocyanate such as 4,4'-diphenyltetramethylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 4, Examples thereof include 4'-diphenyldimethylmethane diisocyanate, 4,4'-dibenzylisocyanate, 1,3-phenylenediocyanate, 1,4-phenylenediocyanate, tolylene diisocyanate, xylylene diisocyanate, m-tetramethylxylylene diisocyanate and the like. To.

Examples of the fused ring aromatic polyisocyanate include 1,5-naphthylene diisocyanate.

［式中、ｎ^ｂは、１以上の整数であり、Ｒ^ｂＡ〜Ｒ^ｂＥはそれぞれ独立に、アルキレン基又はアリーレン基であり、Ｒ^ｂα〜Ｒ^ｂβはそれぞれ独立に、イソシアネート基又は

（ｎ^ｂ１は、０以上の整数であり、Ｒ^ｂ１〜Ｒ^ｂ５はそれぞれ独立に、アルキレン基又はアリーレン基であり、Ｒ^ｂ’〜Ｒ ^ｂ''はそれぞれ独立に、イソシアネート基又はＲ^ｂα〜Ｒ^ｂβ自身の基である。Ｒ^ｂ４〜Ｒ^ｂ５、Ｒ ^ｂ''は、各構成単位ごとに基が異なっていてもよい。）である。Ｒ^ｂＤ〜Ｒ^ｂＥ、Ｒ^ｂβは、各構成単位ごとに基が異なっていてもよい。］で表される化合物等が例示される。 The biuret form of polyisocyanate is
The following structural formula:

[In the formula, n ^b is an integer of 1 or more, R ^{bA to} R ^bE are independently alkylene groups or arylene groups, and R ^{bα to} R ^bβ are independently isocyanate groups or

^{(N b1} is an integer of 0 or ^more, in each of R b1 ^{to R b5} independently an alkylene group or an arylene group, the ^{R b '~R b'} 'are each independently, an isocyanate group, or ^{R bα ~R} It is a group of ^{bβ itself. R b4 to} R ^b5 and R ^b ″ may have different groups for each constituent unit). The ^{groups of} R bD to R ^bE and R ^bβ may be different for each structural unit. ] Is exemplified.

The biuret form of polyisocyanate is Duranate 24A-100, Duranate 22A-75P, Duranate 21S-75E (manufactured by Asahi Kasei Corporation), Death Module N3200A (biuret form of hexamethylene diisocyanate) (manufactured by Sumitomo Bayer Urethane Co., Ltd.). ) Etc. are exemplified.

［式中、ｎ^ｉは、０以上の整数であり、Ｒ^ｉＡ〜Ｒ^ｉＥはそれぞれ独立に、アルキレン基又はアリーレン基であり、Ｒ^ｉα〜Ｒ^ｉβはそれぞれ独立に、イソシアネート基又は

（ｎ^ｉ１は、０以上の整数であり、Ｒ^ｉ１〜Ｒ^ｉ５はそれぞれ独立に、アルキレン基又はアリーレン基であり、Ｒ^ｉ’〜Ｒ ^ｉ'' はそれぞれ独立に、イソシアネート基又はＲ^ｉα〜Ｒ^ｉβ自身の基である。Ｒ^ｉ５、Ｒ^ｉ''は、各構成単位ごとに基が異なっていてもよい。）である。Ｒ^ｉＤ〜Ｒ^ｉＥ、Ｒ^ｉβは、各構成単位ごとに基が異なっていてもよい。］で表される化合物等が例示される。 Isocyanurates of polyisocyanates are
The following structural formula:

Wherein, ^{n i} is an integer of 0 or ^more, R iA ^{to R iE} are each independently an alkylene group or an arylene group, in each of ^{R i.alpha} to R ^i.beta independently, an isocyanate group or

^{(N i1} is an integer of 0 or ^more, R i1 ^{to R i5} is independently an alkylene group or an arylene group, the ^{R i '~R i'} 'are each independently, an isocyanate group, or ^{R i.alpha} to R It is the group of ^{iβ itself. R i5} and R ⁱ ″ may have different groups for each constituent unit). The ^{groups of R iD to} R ^iE and R ^iβ may be different for each structural unit. ] Is exemplified.

Commercially available products of isocyanurates of polyisocyanates are Duranate TPA-100, Duranate TKA-100, Duranate MFA-75B, Duranate MHG-80B (manufactured by Asahi Kasei Co., Ltd.), Coronate HXR (Isocyanurates of hexamethylene diisocyanate). (Made by Toso Co., Ltd.), Takenate D-127N (Isocyanurate of hydrogenated xylene diisocyanate) (Mitsui Chemicals, Ltd.), VESTANAT T1890 / 100 (Isocyanurate of isophorone diisocyanate) (Ebonic Japan (above) (Manufactured by Mitsui Chemicals, Inc.), Takenate D-204EA-1 (isocyanurate of tolylene diisocyanate) (manufactured by Mitsui Chemicals, Inc.), Coronate 2037 (manufactured by Toso Co., Ltd.) and the like are exemplified.

［式中、ｎは、０以上の整数であり、Ｒ^Ａは、アルキル基又はアリール基であり、Ｒ^Ｂ〜Ｒ^Ｇはそれぞれ独立に、アルキレン基又はアリーレン基であり、Ｒ^α〜Ｒ^γはそれぞれ独立に、イソシアネート基又は

（ｎ１は、０以上の整数であり、Ｒ^１〜Ｒ^６はそれぞれ独立に、アルキレン基又はアリーレン基であり、Ｒ’〜Ｒ’’’はそれぞれ独立に、イソシアネート基又はＲ^α〜Ｒ^γ自身の基である。Ｒ^１〜Ｒ^４、Ｒ’〜Ｒ’’は、各構成単位ごとに基が異なっていてもよい。）である。Ｒ^Ｂ〜Ｒ^Ｅ、Ｒ^α〜Ｒ^βは、各構成単位ごとに基が異なっていてもよい。］で表される化合物等が例示される。 The allophanate form of polyisocyanate is
The following structural formula:

Wherein, n is an integer of 0 or more, ^{R A} is an alkyl group or an aryl ^group, each R B to R ^G is independently an alkylene group or an arylene group, the R ^alpha to R ^gamma Independently, isocyanate groups or

(N1 is an integer of 0 or more, R ^{1 to} R ⁶ are independently alkylene groups or arylene groups, and R'to R'''are independently isocyanate groups or R ^{α to} R ^γ themselves. R ^{1 to} R ⁴ , and R'to R'' may have different groups for each constituent unit.). R ^{B to} R ^E and R ^{α to} R ^β may have different groups for each structural unit. ] Is exemplified.

Examples of commercially available products of polyisocyanate allophanates include Coronate 2793 (manufactured by Tosoh Corporation) and Takenate D-178N (manufactured by Mitsui Chemicals, Inc.).

［式中、ｎ^adは０以上の整数であり、Ｒ^adＡ〜Ｒ^adＥは、それぞれ独立にアルキレン基又はアリーレン基であり、Ｒ^ad１〜Ｒ^ad２は、それぞれ独立に

（式中、ｎ^ad’は０以上の整数であり、
Ｒ^ad’〜Ｒ^ad’’は、それぞれ独立にアルキレン基又はアリーレン基であり、
Ｒ^ad’’’は、Ｒ^ad１〜Ｒ^ad２自身の基であり、
Ｒ^ad’〜Ｒ^ad’’’は、各構成単位ごとに基が異なっていてもよい。）
であり、Ｒ^adＤ〜Ｒ^adＥ、Ｒ^ad２は、各構成単位ごとに基が異なっていてもよい。］
で示されるトリメチロールプロパンとポリイソシアネートのアダクト体、
下記構造式

［式中、ｎ^ad1は０以上の整数であり、
Ｒ^adα〜Ｒ^adεは、それぞれ独立にアルキレン基又はアリーレン基であり、
Ｒ^adＡ〜Ｒ^adＢは、それぞれ独立に

（式中、ｎ^ad1’は０以上の整数であり、
Ｒ^adδ’〜Ｒ^adε’は、それぞれ独立にアルキレン基又はアリーレン基であり、
Ｒ^adＢ’は、Ｒ^adＡ〜Ｒ^adＢ自身の基であり、
Ｒ^adδ’〜Ｒ^adε’、Ｒ^adＢ’は、各構成単位ごとに基が異なっていてもよい。）
Ｒ^adδ〜Ｒ^adεは、各構成単位ごとに基が異なっていてもよい。］
で示されるグリセリンとポリイソシアネートのアダクト体等が例示される。 The adduct body of polyisocyanate is
The following structural formula:

[In the formula, n ^ad is an integer of 0 or more, R ^{adA to} R ^adE are independently alkylene groups or arylene groups, and R ^{ad1 to} R ^ad2 are independent of each other.

(In the formula, n ^ad'is an integer greater than or equal to 0,
R ^ad'to R ^ad'' are independently alkylene groups or arylene groups, respectively.
R ^ad''' is the basis of ^{R ad1 to} R ^{ad2 itself,}
The ^{bases of R ad'to} R ^ad''' may be different for each structural unit. )
R ^{adD to} R ^adE and R ^ad2 may have different groups for each structural unit. ]
Adducts of trimethylolpropane and polyisocyanate, indicated by
The following structural formula

[In the formula, n ^ad1 is an integer greater than or equal to 0,
R ^{adα to} R ^adε are independently alkylene groups or arylene groups, respectively.
R ^{adA to} R ^adB are independent of each other

(In the formula, n ^ad1'is an integer greater than or equal to 0,
R ^adδ'to R ^adε' are independently alkylene groups or arylene groups, respectively.
R ^adB'is the basis of R ^adA ~ R ^{adB itself,}
The ^{groups of} R adδ'to R ^adε' and R ^adB'may be different for each structural unit. )
The ^{groups of} R ^{ad δ to R ad ε} may be different for each structural unit. ]
Examples thereof include glycerin and polyisocyanate adducts shown in.

Examples of polyisocyanate adducts include Duranate P301-75E (manufactured by Asahi Kasei Corporation), Takenate D110N, Takenate D160N (manufactured by Mitsui Chemicals, Inc.), Coronate L (manufactured by Tosoh Corporation), and the like. ..

Examples of the upper and lower limits of the NCO content (NCO%) of the polyisocyanate are 30, 25, 20, 15, 10% and the like. In one embodiment, the NCO content (NCO%) is preferably 10 to 30%.

Examples of the upper and lower limits of the isocyanate group equivalent of the polyisocyanate are 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 meq / g and the like. In one embodiment, the isocyanate group equivalent is preferably 1-10 meq / g.

In the present disclosure, the isocyanate group equivalent means the amount of substance of the isocyanate group present in 1 g of the solid.

The upper and lower limits of the ratio (NCO / OH) of the isocyanate group equivalent of polyisocyanate to the hydroxyl group equivalent of the hydroxyl group-containing poly (meth) acrylic copolymer (A) are 4, 3, 2, 1.75, 1.5, 1 0.25, 1, 0.75, 0.5, 0.25, 0.1, 0.05 and the like are exemplified. In one embodiment, the ratio (NCO / OH) is preferably 0.05 to 4.

Examples of the upper and lower limits of the amount of OH groups consumed are 150, 125, 100, 75, 50, 25, 10 mgKOH / g and the like. In one embodiment, the amount of OH groups consumed is preferably 10 to 150 mgKOH / g.

In the present disclosure, the amount of OH groups consumed is an index indicating how much NCO that consumes OH groups in the main agent is added. The amount of OH groups consumed is as follows: Amount of OH groups consumed = Isocyanate group equivalent x 56.1
Is calculated by.

Examples of the upper and lower limits of the content of polyisocyanate in 100% by mass of the coating agent solid content are 40, 35, 30, 25, 20% by mass and the like. In one embodiment, the content is preferably 20-40% by mass.

<One or more particles (C): also referred to as (C) component selected from the group consisting of silica particles having a volume average particle diameter of 1.5 to 6.5 μm and organic particles containing nitrogen atoms. ＞
The component (C) may be used alone or in combination of two or more.

(Silica particles having a volume average particle diameter of 1.5 to 6.5 μm: also referred to as (C1) component)
As the component (C1), one having a spherical shape, a hollow shape, a porous shape, a rod shape, a plate shape, a fibrous shape, or an indefinite shape can be used. The component (C1) may be used alone or in combination of two or more. In one embodiment, the component (C1) is preferably hydrophobic silica particles, more preferably silicone-modified hydrophobic silica particles.

The upper and lower limits of the DBA value of the component (C1) are 150, 125, 100, 90, 75, 50, 40, 25, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10 , 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 mmol / kg and the like. In one embodiment, the DBA value is preferably 0 to 150 mmol / kg.

The DBA value means the number of mmol of di-n-butylamine (DBA) adsorbed on the hydroxyl group existing on the surface of 1 kg of silica particles. The larger the DBA value, the more hydroxyl groups are present on the surface of the silica particles.

In one embodiment, from the viewpoint of stability, it is preferable to use silica particles having a DBA value of 0 to 4050 mmol / kg mmol / kg in combination with silica particles having a DBA value of 50 to 15050 mmol / kg mmol / kg.

Commercially available products of the component (C1) are Nippon Sil SS-50A, SS-50B, SS-50C, SS-50F, SS-50, SS-178B (manufactured by Tosoh Silica Ltd.), Silo Hobic 100, 200. , 702, 704, 507, 505 (manufactured by Fuji Silysia Chemical Ltd.) and the like.

(Organic particles containing nitrogen atoms: also called (C2) component)
Examples of the component (C2) include melamine particles, polymethylurea particles, acrylonitrile particles and the like. The component (C2) can be used alone or in combination of two or more.

Examples of commercially available melamine particles include Epostal MS, Epostal M30, Epostal M05 (all manufactured by Nippon Shokubai Co., Ltd.) and the like.

Examples of commercially available products of polymethylurea particles include Deuteron MK-F6 (manufactured by Deuteron).

Examples of commercially available acrylonitrile particles include Tuftic ASF (manufactured by Japan Exlan Co., Ltd.).

In the present disclosure, the volume average particle size is a particle size at which the volume-based particle size distribution is 50% when integrated from the small particle size side with respect to the volume-based particle size distribution measured by the laser scattering method. is there.

The volume-based particle size distribution can be measured by the following procedure.
(1) Preparation of measurement solution Prepare a solution by adding a measurement sample (particles) to ethyl acetate (purity 99% by mass or more: manufactured by Wako Pure Chemical Industries, Ltd.) so that the measurement sample concentration is 0.1% by mass. .. Next, a measurement solution is prepared by mixing and dispersing the solution at 4000 rpm for 5 minutes using a high-speed disperser (product name “Homo Disper”, manufactured by Primix Corporation).
(2) Measurement of Volume-Based Particle Size Distribution The volume-based particle size distribution can be measured using a laser diffraction / scattering type particle size distribution measuring device "Microtrack NT3300" (manufactured by Nikkiso Co., Ltd.). The measurement conditions are as follows.
Number of measurements: 3
Measurement temperature: 25 ± 5 ° C
Measurement time: 30 seconds Particle size classification: Standard calculation mode: MT3000II
Upper limit of measurement: 2000 μm
Lower limit of measurement: 0.021 μm
Residual ratio: 0.00%
Passage ratio: 0.00%
Residual ratio setting: Invalid particle permeability: Permeated particle shape: Non-spherical measurement solvent (ethyl acetate) refractive index: 1.372
For the refractive index of the measurement sample (particle), reference values (“A GUIDE FOR ENTERRING MICROTRAC“ RUN INFORMATION ”(F3) DATA”, produced by Leads & Northrup) and the like can be referred to.

The upper and lower limits of the volume average particle size of the component (C) are 6.5, 6, 5.5, 5, 4.5, 4, 3.5, 3, 2.5, 2.2, 2, and so on. An example is 1.5 μm. In one embodiment, the volume average particle size is preferably 1.5 to 6.5 μm.

The upper and lower limits of the volume average particle size of the component (C1) are 6.5, 6, 5.5, 5, 4.5, 4, 3.5, 3, 2.5, 2.2, 2, and so on. An example is 1.5 μm. In one embodiment, the volume average particle size is preferably 1.5 to 6.5 μm.

The upper and lower limits of the volume average particle size of the component (C2) are 6.5, 6, 5.5, 5, 4.5, 4, 3.5, 3, 2.5, 2.2, 2, and so on. An example is 1.5 μm. In one embodiment, the volume average particle size is preferably 1.5 to 6.5 μm.

Examples of the upper and lower limits of the content of the component (C) in 100% by mass of the coating agent solid content are 40, 35, 30, 25, 20, 15, 10, 9, 5, 2, 1% by mass and the like. .. In one embodiment, the content is preferably 1-40% by mass.

The upper and lower limits of the content of the component (C1) in 100% by mass of the coating agent solid content are exemplified by 40, 35, 30, 25, 20, 15, 10, 9, 5, 2, 1, 0% by mass and the like. Will be done. In one embodiment, the content is preferably 0 to 30% by mass.

The upper and lower limits of the content of the component (C2) in 100% by mass of the coating agent solid content are exemplified by 40, 35, 30, 25, 20, 15, 10, 9, 5, 2, 1, 0% by mass and the like. Will be done. In one embodiment, the content is preferably 0 to 30% by mass.

<Hydroxy group-containing organically modified silicone: Also referred to as component (D). ＞
In the present disclosure, "hydroxyl-containing organically modified silicone" means, for example, a silicone having a hydroxyl group-containing organic group. The hydroxyl group-containing organically modified silicone can be used alone or in combination of two or more. By containing a hydroxyl group, it reacts with polyisocyanate and is fixed in the cured product, so that light peeling becomes possible.

Examples of the hydroxyl group-containing organically modified silicone include hydroxyl group-containing acrylic polymer-modified silicone, hydroxyl group-containing polyester-modified silicone, hydroxyl group-containing polyether-modified silicone, and hydroxyl group-containing carbinol-modified silicone. The modified site may be introduced into one of the one end, both ends, and the side chain of the silicone chain.

Commercially available products of hydroxyl group-containing acrylic polymer-modified silicone are ZX-028-G (manufactured by T & K TOKA Co., Ltd.), BYK-SILCLEAN3700 (manufactured by Big Chemie Japan Co., Ltd.), and Cymac US-270 (manufactured by Toagosei Co., Ltd.). Etc. are exemplified.

Commercially available products of hydroxyl group-containing polyether-modified silicone or hydroxyl group-containing polyester-modified silicone are BYK-370, BYK-375, BYK-377, BYK-SILCLEAN3720 (manufactured by Big Chemie Japan Co., Ltd.), X-22-4952, KF- 6123 (manufactured by Shin-Etsu Chemical Co., Ltd.) and the like are exemplified.

Commercially available hydroxyl group-containing carbinol-modified silicones are X-22-4039, X-22-4015, X-22-4952, X-22-2272, X-22-170BX, X-22-170DX, KF-6000. , KF-6001, KF-6002, KF-6003, KF-6123, X-22-176F (manufactured by Shin-Etsu Chemical Co., Ltd.), Silaplane FM-4411, Silaplane FM-4421, Silaplane FM-4425, Examples thereof include Syrahplane FM-0411, Syrahplane FM-0421, Syrahplane FM-DA11, Syrahplane FM-DA21, and Syrahplane FM-DA26 (manufactured by JNC Co., Ltd.).

The upper and lower limits of the content of the component (D) in 100% by mass of the coating agent solid content are exemplified by 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0% by mass and the like. .. In one embodiment, the content is preferably 0 to 10% by mass.

<Curing catalyst: Also referred to as component (E). ＞
In one embodiment, the coating agent may include a curing catalyst. The curing catalyst can be used alone or in combination of two or more.

Examples of the curing catalyst include an organometallic catalyst and an organic amine catalyst.

Examples of the organometallic catalyst include a typical organometallic catalyst and an organotransition metal catalyst.

Examples of the organic typical metal catalyst include an organic tin catalyst and an organic bismuth catalyst.

Examples of the organic tin catalyst include dibutyl tin dilaurate and dioctyl tin dilaurate.

Examples of the organic bismuth catalyst include bismuth octylate.

Examples of the organic transition metal catalyst include an organic titanium catalyst, an organic zirconium catalyst, and an organic iron catalyst.

Examples of the organic titanium catalyst include titanium ethyl acetoacetate and the like.

Examples of the organic zirconium catalyst include zirconium tetraacetylacetonate.

Examples of the organic iron catalyst include iron acetylacetoneate.

Examples of the organic amine catalyst include diazabicyclooctane, dimethylcyclohexylamine, tetramethylpropylenediamine, ethylmorpholine, dimethylethanolamine, triethylamine and triethylenediamine.

The upper and lower limits of the content of the component (E) in 100% by mass of the coating agent solid content are exemplified by 1, 0.9, 0.7, 0.5, 0.3, 0.1, 0% by mass and the like. Will be done. In one embodiment, the content is preferably 0 to 1% by mass.

<Organic solvent: Also referred to as component (F). ＞
In one embodiment, the coating agent may contain an organic solvent. The organic solvent may be used alone or in combination of two or more.

Organic solvents include ketone solvents such as methyl ethyl ketone, acetyl acetone, methyl isobutyl ketone and cyclohexanone; aromatic solvents such as toluene and xylene; alcohol solvents such as methanol, ethanol, n-propanol, isopropanol and butanol; ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, Glycol ether solvents such as triethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether and propylene glycol monomethyl ether acetate; ester solvents such as ethyl acetate, butyl acetate, methyl cellosolve acetate and cellosolve acetate; Examples thereof include petroleum-based solvents such as trade names (manufactured by Exxon Mobile Co., Ltd.); haloalkane solvents such as chloroform; and amide solvents such as dimethylformamide.

Examples of the upper and lower limits of the content of the component (F) in 100% by mass of the coating agent are 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35% by mass and the like. .. In one embodiment, the content is preferably 35 to 90% by mass.

<Relative ratio of each component>
The upper and lower limits of the mass ratio of the component (B) to the component (A) [mass of the component (B) / mass of the component (A)] contained in the coating agent are 1, 0.9, 0.7, 0. .5, 0.3, 0.28 and the like are exemplified. In one embodiment, the mass ratio is preferably 0.28 to 1.

The upper and lower limits of the mass ratio of the component (C) to the component (A) [mass of the component (C) / mass of the component (A)] contained in the coating agent are 1, 0.9, 0.8, 0. .75, 0.5, 0.25, 0.1, 0.05, 0.01 and the like are exemplified. In one embodiment, the mass ratio is preferably 0.01 to 1.

The upper and lower limits of the mass ratio of the component (D) to the component (A) [mass of the component (D) / mass of the component (A)] contained in the coating agent are 0.25, 0.2, 0.1. , 0.05, 0 and the like are exemplified. In one embodiment, the mass ratio is preferably 0 to 0.25.

The upper and lower limits of the mass ratio of the component (C) to the component (B) [mass of the component (C) / mass of the component (B)] contained in the coating agent are 2, 1.5, 1, 0.5. , 0.1, 0.05, 0.025 and the like. In one embodiment, the mass ratio is preferably 0.025 to 2.

The upper and lower limits of the mass ratio of the component (D) to the component (B) contained in the coating agent [mass of component (D) / mass of component (B)] are 0.5, 0.25, 0.1. , 0.05, 0 and the like are exemplified. In one embodiment, the mass ratio is preferably 0 to 0.5.

The upper and lower limits of the mass ratio of the component (D) to the component (C) contained in the coating agent [mass of component (D) / mass of component (C)] are 10, 9, 7, 5, 3, 1 , 0 and the like are exemplified.
In one embodiment, the mass ratio is preferably 0 to 10.

<Additives>
The coating agent may contain an agent that does not correspond to any of the components (A) to (F) as an additive.

Examples of additives include antioxidants, light stabilizers, defoamers, surface conditioners, pigments, antistatic agents, and metal oxide fine particle dispersions.

In one embodiment, the content of the additive is exemplified by less than 1 part by mass, less than 0.1 part by mass, less than 0.01 part by mass, 0 part by mass, etc. with respect to 100 parts by mass of the solid content of the composition. To. Further, less than 1 part by mass, less than 0.1 part by mass, less than 0.01 part by mass, 0 part by mass and the like are exemplified with respect to 100 parts by mass of any of the components (A) to (F).

The coating agent can be produced by dispersing and mixing the components (A) to (C), and if necessary, the components (D) to (F) and additives by various known means. The order of addition of each component is not particularly limited. Further, as the dispersion / mixing means, various known devices (emulsification disperser, ultrasonic disperser, etc.) can be used.

The coating agent can be used as a thermosetting coating agent, a matte coating agent, and a thermosetting matte coating agent.

[Cured product]
The present disclosure provides a cured product of the above coating agent.

In one embodiment, the cured product is obtained by thermosetting. Thermosetting can be performed by applying a coating agent and then drying it. Examples of the conditions will be described later.

[the film]
The present disclosure provides a film containing the cured product.

Various known base materials are used. The base material is polycarbonate film, acrylic film (polymethylmethacrylate film, etc.), polystyrene film, polyester film, polyolefin film, epoxy resin film, melamine resin film, triacetyl cellulose film, ABS film, AS film, norbornene resin film, cyclic. Examples thereof include olefin films, polyvinyl alcohol films, and thermoplastic polyurethane elastomer (TPU) films.

The thickness of the base material is not particularly limited, but is preferably about 20 to 300 μm. The thickness of the cured product layer is also not particularly limited, but is preferably about 1 to 10 μm.

The film is produced by various known methods. In one embodiment, the method for producing a film includes a step of applying the coating agent to at least one surface of a base material (coating step) and a step of thermosetting to form a cured product layer (thermosetting step). ..

(Coating process)
Examples of the coating method include bar coater coating, wire bar coating, Mayer bar coating, air knife coating, gravure coating, reverse gravure coating, offset printing, flexographic printing, screen printing method and the like.

The amount of coating is not particularly limited. The amount of coating is preferably about 1 to 10 g / m ² after drying, and more preferably about ² to 8 g / m 2.

(Thermosetting process)
The drying method is exemplified by drying with a circulation dryer or the like. Examples of drying conditions include standing at 100 ° C. for 1 minute.

When the film is produced, it is dried and then aged if necessary. As an example, an aging treatment at 40 ° C. for 72 hours is exemplified.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. However, the description in the preferred embodiment described above and the following examples are provided only for the purpose of illustration, and are not provided for the purpose of limiting the present invention. Therefore, the scope of the present invention is not limited to the embodiments and examples specifically described in the present specification, but is limited only by the claims. Further, in each Example and Comparative Example, unless otherwise specified, numerical values such as parts and% are based on mass.

<Ingredient (A)>
Production Example 1: Production of hydroxyl group-containing (meth) acrylic copolymer 275.6 parts of methyl methacrylate (79.9 in monomer component) in a reaction vessel equipped with a stirrer, thermometer, reflux cooling tube, dropping funnel and nitrogen introduction tube. Mass%), 10.3 parts of n-butyl acrylate (3% by mass in the monomer component), 58.6 parts of 2-hydroxyethyl acrylate (17% by mass in the monomer component), and 0.4 part of styrene (monomer component). (0.1% by mass), 125 parts of methyl ethyl ketone and 525 parts of ethyl acetate were charged, and the reaction system was set to 80 ° C. Next, 2.1 parts of 2,2'-azobis (2, methylvaleronitrile) was charged and kept warm at around 80 ° C. for 5 hours. Then, 5.2 parts of 2,2'-azobis (2,4-dimethylbutyronitrile) was charged, and the reaction system was kept warm at the same temperature for another 4 hours. Then, the reaction system was cooled to room temperature to obtain a solution of a hydroxyl group-containing (meth) acrylic copolymer (nonvolatile content: 35%).

ＭＭＡ：メタクリル酸メチル
ＢＡ：アクリル酸ｎ−ブチル
ＨＥＡ：アクリル酸２−ヒドロキシエチル
ＢＭＡ：メタクリル酸ｎ−ブチル
ＨＥＭＡ：メタクリル酸２−ヒドロキシエチル
Ｓｔ：スチレン The hydroxyl group-containing (meth) acrylic copolymer other than Production Example 1 was produced in the same manner as in Production Example 1 except that the amount of the monomer used was changed as shown in the table below.

MMA: Methyl methacrylate BA: n-butyl acrylate HEA: 2-hydroxyethyl acrylate BMA: n-butyl HEMA methacrylate: 2-hydroxyethyl methacrylate St: styrene

Example 1: Production of coating agent 100 parts of hydroxyl group-containing (meth) acrylic copolymer of Production Example 1, silica particles (product name "Nipsil SS-50F", manufactured by Tosoh Silica Co., Ltd., hereinafter also referred to as "SS50F") 5 The particles were mixed and dispersed using a high-speed disperser (product name "Homo Dispar", manufactured by Primix Corporation) at 4000 rpm for 15 minutes to obtain a particle dispersion. Furthermore, by mixing 22.4 parts of an adduct of xylene diisocyanate (product name "Takenate D-110N", manufactured by Mitsui Chemicals, Inc.) and 93.8 parts of methyl ethyl ketone (hereinafter, MEK), the solid content concentration is 25%. Manufactured the coating agent of.

Examples other than Example 1 and Comparative Examples were produced in the same manner as in Example 1 except that they were changed as shown in the table below.

The following tests were performed on each of the manufactured coating agents and evaluated.

(Stability)
◯: No precipitation or separation of particles was observed even after the coating agent was left at 25 ° C. for 4 months.
Δ: No precipitation or separation of particles was observed after the coating agent was left at 25 ° C. for 1 month. However, if the coating agent is left for 2 months or more, sedimentation with time is observed.
X: Particles settle and separate after being left to stand at 25 ° C. for 1 month.

(Low temperature curability)
The PET film was coated with a bar coater to a size of 3 μm, and then dried at 60 ° C. for 1 minute. Then, aging was carried out at 40 ° C. for 72 hours while applying a load of 8 kg / cm ^{2, and the evaluation was made according to the following criteria.}
◯: There is no change in the 60 ° gloss value before and after blocking and aging.
Δ: No blocking is observed, but a change in the 60 ° gloss value is observed before and after aging.
X: Blocking is seen.

(Adhesion to base material)
The PET film was coated with a bar coater to a thickness of 3 μm, dried at 60 ° C. for 1 minute, and then aged at 40 ° C. for 72 hours.
Adhesion was then evaluated by a grid tape peeling test and the following criteria.
◯: No peeling from the base material is observed.
X: There is peeling from the base material.

(Solvent resistance)
Rubbing was carried out 10 times using a cotton swab impregnated with methyl ethyl ketone, and evaluated according to the following criteria.
○: The substrate cannot be seen ×: The substrate can be seen

(60 ° gloss)
It was measured by GlossMeter VG7000 (manufactured by Nippon Denshoku Kogyo Co., Ltd.).

<Ingredient (B)>
XDI: Xylene diisocyanate TDI: Toluene diisocyanate HDI: Hexamethylene diisocyanate XDI Adduct: Product name "Takenate D-110N", TDI Nurate manufactured by Mitsui Chemicals, Inc .: Product name "Coronate 2037", HDI Nurate: Product Name "Coronate HX", manufactured by Toso Co., Ltd.

Melamine 1: Product name "Simel 303LF", made by Ornex

<Ingredient (C)>
SS50F: Product name "Nipsil SS-50F", manufactured by Tosoh Silica Co., Ltd., particle size 2.0 μm, DBA value: 1450 mmol / kg mmol / kg
SS50C: Product name "Nipsil SS-50C", manufactured by Tosoh Silica Co., Ltd., particle size 6.0 μm, DBA value: 950 mmol / kg mmol / kg
SS50B: Product name "Nipsil SS-50B", manufactured by Tosoh Silica Co., Ltd., particle size 4.5 μm, DBA value: 1650 mmol / kg mmol / kg
S100: Product name "Silo Hobic 100", manufactured by Fuji Silysia Chemical Ltd., particle size 2.2 μm, DBA value: 5050 mmol / kg mmol / kg
SS178B: Product name "Nipsil SS-178B", manufactured by Tosoh Silica Co., Ltd., particle size 6.7 μm, DBA value: 1250 mmol / kg mmol / kg

Epostal M30: Product name "Epostal M30", manufactured by Nippon Shokubai Co., Ltd., melamine resin particles, particle size 4.0 μm

MX300: Product name "MX-300", manufactured by Soken Chemical Co., Ltd., cross-linked acrylic monodisperse particles, particle size 3.0 μm
SX-350H: Product name "SX-350H", manufactured by Soken Chemical Co., Ltd., crosslinked styrene resin particles, particle size 3.5 μm

<(D) component> BYK-SILCLEAN3700 (manufactured by Big Chemie Japan Co., Ltd.) BYK-SILCLEAN3700: Product name "BYK-SILCLEAN3700", manufactured by Big Chemie Japan Co., Ltd., hydroxyl group-containing acrylic polymer-modified silicone BYK-377: Product name "BYK-377", manufactured by Big Chemie Japan Co., Ltd., hydroxyl group-containing polyether-modified polydimethylsiloxane,

Claims (4)

A hydroxyl group-containing (meth) acrylic copolymer (A) having a glass transition temperature of 30 to 110 ° C. and a hydroxyl value of 30 to 150 mgKOH / g.
One or more particles (C) selected from the group consisting of polyisocyanate (B), silica particles having a volume average particle diameter of 1.5 to 6.5 μm, and organic particles containing nitrogen atoms.
Including coating agent. The coating agent according to claim 1, which comprises a hydroxyl group-containing organically modified silicone (D). A cured product of the coating agent according to claim 1 or 2. A film containing the cured product according to claim 3.