WO2017195598A1

WO2017195598A1 - Ultraviolet curable resin composition, cured film and laminate

Info

Publication number: WO2017195598A1
Application number: PCT/JP2017/016498
Authority: WO
Inventors: 依慶米山; 裕一松木; 護鶴田; 丈章齋木
Original assignee: 横浜ゴム株式会社
Priority date: 2016-05-10
Filing date: 2017-04-26
Publication date: 2017-11-16
Also published as: TW201815583A; JPWO2017195598A1; TWI716591B; CN109071694A

Abstract

The purpose of the present invention is to provide: an ultraviolet curable resin composition which is capable of forming a cured film having excellent re-coating properties; a cured film which is formed from this ultraviolet curable resin composition; and a laminate which is provided with a base and this cured film. An ultraviolet curable resin composition according to the present invention contains: a polyfunctional (meth)acryloyloxy group-containing compound; a nonionic oligomer having a fluorine atom-containing group, a hydrophilic group and a lipophilic group; a photopolymerization initiator; and a dry silica having an average primary particle diameter of 100 nm or less.

Description

UV curable resin composition, cured film, and laminate

The present invention relates to an ultraviolet curable resin composition, a cured film, and a laminate.

In recent years, various thin electronic devices such as a touch panel device, an organic EL display device, a liquid crystal display device, and electronic paper have been put into practical use.
These electronic devices generally use a cured film (hard coat layer) or a laminate (hard coat film) having a base material such as a PET film and a hard coat layer provided on the base material. ing.
As an ultraviolet curable resin composition for forming such a hard coat layer or hard coat film, for example, in the example of Patent Document 1, dipentaerythritol hexaacrylate as a polyfunctional (meth) acrylate and a leveling agent A composition containing 1-hydroxycyclohexyl phenyl ketone as a photopolymerization initiator and MIBK-ST (wet silica, manufactured by Nissan Chemical Industries, Ltd.) as silica nanoparticles is disclosed.

JP 2014-232276 A

In recent years, with the enhancement of functionality of electronic devices, the number of cases where another layer (for example, OCA (Optically Clear Adhesive) or OCR (Optically Clear Resin)) is formed on a hard coat layer or a hard coat film is increasing. ing. For this reason, the cured film (hard coat layer) is required to be compatible with the other layer when another layer is to be formed thereon. That is, recoatability is required.
Under these circumstances, the present inventors prepared an ultraviolet curable resin composition with reference to the example of Patent Document 1 and produced a cured film, and the recoatability of the obtained cured film was recently required. It became clear that it does not necessarily satisfy.

Accordingly, in view of the above circumstances, the present invention provides an ultraviolet curable resin composition capable of forming a cured film excellent in recoatability, a cured film formed from the ultraviolet curable resin composition, a substrate, and the above It aims at providing a laminated body provided with a cured film.

As a result of intensive studies on the above problems, the present inventors have found that the above problems can be solved by using a specific nonionic oligomer and dry silica together, and have reached the present invention.
That is, the present inventor has found that the above problem can be solved by the following configuration.

(1) a polyfunctional (meth) acryloyloxy group-containing compound;
A nonionic oligomer having a fluorine atom-containing group, a hydrophilic group and a lipophilic group;
A photopolymerization initiator;
An ultraviolet curable resin composition containing dry silica having an average primary particle size of 100 nm or less.
(2) The polyfunctional (meth) acryloyloxy group-containing compound includes the polyfunctional (meth) acryloyloxy group-containing compound having a partial structure represented by the following general formula (A). UV curable resin composition.
* -CH ₂ CH ₂ O- * (A)
In formula (A), * represents a bonding position.
(3) The ultraviolet curable resin composition according to (1) or (2), wherein the polyfunctional (meth) acryloyloxy group-containing compound includes a polyfunctional (meth) acryloyloxy group-containing compound having a urethane group. .
(4) The ultraviolet curable resin composition according to any one of (1) to (3), wherein the nonionic oligomer has a (meth) acryloyloxy group.
(5) The ultraviolet curable resin composition according to any one of (1) to (4), wherein the photopolymerization initiator is an α-hydroxyalkylphenone compound or an α-aminoalkylphenone compound. .
(6) The ultraviolet curable resin composition according to the above (5), wherein the photopolymerization initiator is an α-hydroxyacetophenone compound.
(7) The ultraviolet curable resin composition according to any one of (1) to (6), wherein the dry silica is a dry silica that has been subjected to a hydrophobic treatment.
(8) The content of the nonionic oligomer is 0.01 to 10 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound.
The content of the photopolymerization initiator is 0.1 to 10 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound,
The ultraviolet curing according to any one of (1) to (7) above, wherein the content of the dry silica is 1 to 30 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound. Mold resin composition.
(9) A cured film formed from the ultraviolet curable resin composition according to any one of (1) to (8) above.
(10) A laminate comprising a substrate and the cured film according to (9) above.
(11) The laminate according to (10), which is a functional film constituting an electronic device component.

As shown below, according to the present invention, an ultraviolet curable resin composition capable of forming a cured film excellent in recoatability, a cured film formed from the ultraviolet curable resin composition, a substrate, and the above A laminated body provided with a cured film can be provided.

Below, the ultraviolet curable resin composition of this invention, a cured film, and a laminated body are demonstrated.
In this specification, a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value. The term “(meth) acryloyloxy group” means an acryloyloxy group (CH ₂ ═CHCOO—) and / or a methacryloyloxy group (CH ₂ ═C (CH ₃ ) COO—). “) Acryloyl group” means an acryloyl group (CH ₂ ═CHCO—) and / or a methacryloyl group (CH ₂ ═C (CH ₃ ) CO—), and “(meth) acrylate” means acrylate and And / or methacrylate, and “(meth) acryl” means acryl and / or methacryl.

[Ultraviolet curable resin composition]
The ultraviolet curable resin composition of the present invention (hereinafter also referred to as “the composition of the present invention”) comprises a polyfunctional (meth) acryloyloxy group-containing compound, a fluorine atom-containing group, a hydrophilic group, and a lipophilic group. The nonionic oligomer (hereinafter also referred to as “specific nonionic oligomer”), a photopolymerization initiator, and dry silica having an average primary particle size of 100 nm or less.
Since the composition of this invention takes such a structure, it is thought that the effect mentioned above is acquired. The reason is not clear, but it is presumed that it is as follows.
As described above, the composition of the present invention contains a specific nonionic oligomer. Therefore, when a coating film is formed using the composition of the present invention, it is considered that the specific nonionic oligomer tends to be unevenly distributed on the surface of the coating film due to the action of the fluorine atom-containing group. As a result, it is speculated that the hydrophilic group of the specific nonionic oligomer increases the wettability of the surface of the coating film and improves the recoatability. In addition, since the specific nonionic oligomer also has a lipophilic group, it has high affinity with other components (for example, a polyfunctional (meth) acryloyloxy group-containing compound), and the uneven distribution of the specific nonionic oligomer described above is It is considered that the surface becomes uniform and recoatability is ensured.
Here, although the composition of the present invention contains silica, since the contained silica is fine dry silica, it has a high affinity with the above-described lipophilic group and prevents the uneven distribution of the above-described specific nonionic oligomer. It is thought that there is no. On the contrary, when wet silica like patent document 1 is used, since the affinity with the lipophilic group of a specific nonionic oligomer is low, it is thought that uneven distribution of a specific nonionic oligomer is prevented. This is presumed from the fact that the recoatability becomes insufficient when wet silica is used as silica, as shown in a comparative example described later.

Hereinafter, each component contained in the composition of the present invention will be described in detail.

[Polyfunctional (meth) acryloyloxy group-containing compound]
The polyfunctional (meth) acryloyloxy group-containing compound contained in the composition of the present invention is not particularly limited as long as it is a compound having two or more (meth) acryloyloxy groups.
The number of (meth) acryloyloxy groups contained in the polyfunctional (meth) acryloyloxy group-containing compound is preferably 3 or more from the viewpoint of excellent coating properties and curability of the composition of the present invention. Is more preferable.
In addition, the polyfunctional (meth) acryloyloxy group-containing compound is preferably a compound other than the specific nonionic oligomer described later because the effect of the present invention is more excellent.

The polyfunctional (meth) acryloyloxy group-containing compound is a group consisting of a polyfunctional (meth) acryloyloxy group-containing compound having a (meth) acrylic acid ester of a polyhydric alcohol and a urethane group because the effects of the present invention are more excellent. It is preferable to include at least one polyfunctional (meth) acryloyloxy group-containing compound selected more preferably, and it is more preferable to include a polyfunctional (meth) acryloyloxy group-containing compound having a urethane group.

<(Meth) acrylic acid ester of polyhydric alcohol>
Examples of polyhydric alcohol (meth) acrylic acid esters include trifunctional groups such as trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, and dipentaerythritol tri (meth) acrylate; pentaerythritol tetra Tetrafunctional system such as (meth) acrylate, dipentaerythritol tetra (meth) acrylate, tripentaerythritol tetra (meth) acrylate; dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tripentaerythritol Penta (meth) acrylate, tripentaerythritol hexa (meth) acrylate, tripentaerythritol hepta (meth) acrylate, tripentaerythritol o Data (meth) 5 or higher functional systems such as acrylate.
When the polyfunctional (meth) acryloyloxy group-containing compound contains a polyhydric alcohol (meth) acrylic acid ester, the ratio of the polyfunctional alcohol (meth) acrylic acid ester in the polyfunctional (meth) acryloyloxy group-containing compound is The content is preferably 5 to 95% by mass, and more preferably 30 to 80% by mass.

<Polyfunctional (meth) acryloyloxy group-containing compound having a urethane group>
Examples of the polyfunctional (meth) acryloyloxy group-containing compound having a urethane group include a reaction product of a polyhydric alcohol (meth) acrylic acid ester and a polyisocyanate compound.
Here, as the (meth) acrylic acid ester of a polyhydric alcohol used when producing a polyfunctional (meth) acryloyloxy group-containing compound having a urethane group, for example, the polyhydric alcohol (meth) described above is used. Among the acrylic esters, those having at least one hydroxy group can be mentioned.
Examples of the polyisocyanate compound used for producing a polyfunctional (meth) acryloyloxy group-containing compound having a urethane group include tolylene diisocyanate, diphenylmethane diisocyanate, phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, and xylylene. Aromatic polyisocyanates such as diisocyanate, tetramethylxylylene diisocyanate, tolidine diisocyanate, 1,5-naphthalene diisocyanate, triphenylmethane triisocyanate; hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, norbornane diisocyanate, transcyclohexane 1,4-diisocyanate, isophorone diisocyanate , Bis (isocyanatomethyl) cyclohexane, aliphatic polyisocyanates such as dicyclohexylmethane diisocyanate; these isocyanurate, biuret body, an adduct; and the like are.
When the polyfunctional (meth) acryloyloxy group-containing compound contains a polyfunctional (meth) acryloyloxy group-containing compound having a urethane group, the polyfunctional (meth) having a urethane group in the polyfunctional (meth) acryloyloxy group-containing compound The proportion of the acryloyloxy group-containing compound is preferably 5 to 95% by mass, and more preferably 20 to 80% by mass.

<Preferred embodiment>
As a suitable aspect of the polyfunctional (meth) acryloyloxy group-containing compound, for example, a compound having two or more (meth) acryloyloxy groups and a partial structure represented by the following general formula (A) (hereinafter, Also referred to as “compound A”).
When the polyfunctional (meth) acryloyloxy group-containing compound contains compound A, due to the synergistic effect of the partial structure represented by general formula (A) in compound A and the hydrophilicity of the specific nonionic oligomer described below, It is considered that the wettability of the surface of the coating film is further increased, and as a result, the effect of the present invention is more excellent.

* -CH ₂ CH ₂ O- * (A)

In the above formula (A), * represents a bonding position.

Compound A preferably has a group represented by the following general formula (a).

In the above formula (a), L represents a single bond or * _1- (COC ₅ H ₁₀ O) _m- * ₂ (where m represents an integer of 1 or more (preferably an integer of 1 to 8)). * ₁ represents a bonding position with an oxygen atom, * ₂ represents a bonding position with X). X represents a (meth) acryloyl group. n represents an integer of 1 or more (preferably an integer of 1 to 10).

(Compound represented by formula (N))
Compound A is preferably a compound represented by the following formula (N).

In the above formula (N), R ₁ to R ₃ each independently represents a group represented by the following a, b or c. However, at most _one of R ₁ to R ₃ is represented by a.
a: —H or — (CH ₂ ) _n —OH (where n represents an integer of 1 to 10 (preferably an integer of 2 to 6))
b: — (CH ₂ ) _n —O— (COC ₅ H ₁₀ O) _m —R (where R represents a (meth) acryloyl group, n represents 2 and m represents an integer of 1 or more (preferably Represents an integer of 1 to 8))
c: — (CH ₂ ) _n —O—R (where R represents a (meth) acryloyl group and n represents 2)

Specific examples of the compound represented by the formula (N) are shown below.

Commercially available products of the compound represented by formula (N) include, for example, NK ester A-9300, ε-caprolactone modified tris- (acryloxyethyl) isocyanate manufactured by Shin-Nakamura Chemical Co., Ltd., which is ethoxylated isocyanuric acid triacrylate. Examples thereof include, but are not limited to, NK ester A-9300 1CL manufactured by Shin-Nakamura Chemical Co., Ltd. and Aronix M-327 manufactured by Toagosei Co., Ltd.

When the polyfunctional (meth) acryloyloxy group-containing compound contains compound A, the proportion of compound A in the polyfunctional (meth) acryloyloxy group-containing compound is preferably 1 to 90% by mass, and preferably 5 to 70% by mass. It is more preferable that

Even if the polyfunctional (meth) acryloyloxy group-containing compound contained in the composition of the present invention is one kind of polyfunctional (meth) acryloyloxy group-containing compound, two or more kinds of polyfunctional (meth) acryloyloxy A group-containing compound may be included.
The polyfunctional (meth) acryloyloxy group-containing compound preferably contains the compound A described above for the reason that the effects of the present invention are more excellent, and is a polyfunctional (meth) acrylic acid ester of polyhydric alcohol and a polyfunctional compound having a urethane group ( It is more preferable to include all of the (meth) acryloyloxy group-containing compound and compound A.

[Nonionic oligomer]
The nonionic oligomer (specific nonionic oligomer) containing a fluorine atom-containing group, a hydrophilic group and a lipophilic group contained in the composition of the present invention comprises a fluorine atom-containing group, a hydrophilic group and a lipophilic group. If it is a nonionic oligomer to contain, it will not restrict | limit in particular. Here, nonionicity means nonionicity. The oligomer means a polymer having a number average molecular weight of several hundred to several tens of thousands (preferably 500 to 50,000).
In addition, let the number average molecular weight in this specification be the polystyrene conversion value measured by the gel permeation chromatography (GPC) method.
Further, the skeleton (main chain) of the nonionic oligomer is preferably polyoxyethylene ether or (meth) acrylic, more preferably (meth) acrylic, because the effect of the present invention is more excellent. preferable.
Below, a fluorine atom containing group, a hydrophilic group, and a lipophilic group are explained in full detail first, and a suitable aspect is explained in full detail after that.

<Fluorine atom-containing group>
The fluorine atom-containing group is not particularly limited as long as it is a group containing a fluorine atom, but is preferably a hydrocarbon group in which at least some of the hydrogen atoms are substituted with fluorine atoms. It may be a hydrocarbon group in which all hydrogen atoms are substituted with fluorine atoms (perfluorohydrocarbon group).
Although it does not restrict | limit especially as a hydrocarbon group, An aliphatic hydrocarbon group, an aromatic hydrocarbon group, what combined these, etc. are mentioned. Of these, an aliphatic hydrocarbon group is preferable.
The aliphatic hydrocarbon group may be linear, branched or cyclic, but is preferably branched. Specific examples of the aliphatic hydrocarbon group include linear or branched alkyl groups (particularly 1 to 50 carbon atoms), linear or branched alkenyl groups (particularly 2 to 50 carbon atoms), Examples thereof include linear or branched alkynyl groups (particularly those having 2 to 50 carbon atoms).
Examples of the aromatic hydrocarbon group include an aryl group and a naphthyl group. Examples of the aryl group include aryl groups having 6 to 18 carbon atoms such as a phenyl group, a tolyl group, and a xylyl group.

The fluorine atom-containing group is preferably a branched aliphatic hydrocarbon group (branched fluoroaliphatic hydrocarbon group) in which at least some of the hydrogen atoms are substituted with fluorine atoms.
The branched fluoroaliphatic hydrocarbon group is preferably composed of an alkyl group and / or alkenyl group having a branched structure, and at least some of the hydrogen atoms are preferably substituted with fluorine atoms. Examples of the fluoroaliphatic hydrocarbon group include perfluoroisopropyl, perfluoroisobutyl, perfluoro s-butyl, perfluoro t-butyl, perfluoroisopentyl, perfluoroneopentyl, perfluorot-pentyl, perfluoroiso Perfluoro C _3-16 alkyl groups such as hexyl and perfluoro-2-ethylhexyl groups, or perfluoro C _3-16 alkenyl groups corresponding to these alkyl groups (for example, perfluoroneopentan-1-yl group, perfluoro A neopentan-2-yl group, a perfluoro t-pentan-1-yl group, a perfluoro t-pentan-2-yl group, etc.). The aliphatic hydrocarbon group preferably has a highly branched structure, and 2 to 6 (preferably 2 to 4) alkyl groups may be branched based on the longest carbon chain. The alkyl chain may be a methyl group, and in the case of an alkyl chain having 2 or more carbon atoms (for example, a C _2-4 alkyl group), it may be a straight chain or branched like an isopropyl group. Also good. Such highly branched hydrocarbon groups include, for example, dimers (dimers) and trimers of alkenes (C _3-6 alkenes such as propylene, butene, isobutene, pentene, and isopentene, especially branched alkenes). In many cases, it corresponds to a hydrocarbon group of a multimer (preferably dimer to tetramer, particularly trimer) such as (trimer) and tetramer (tetramer).

Examples of the alkyl group and / or alkenyl group corresponding to the fluoroalkyl group and / or fluoroalkenyl group having such a branched structure include a 1,3-dimethylbutyl group and a 1,3-dimethyl-2-isopropylbutyl group. Branched chain C _6-18 alkyl groups such as 2-ethyl-2-butyl-hexyl group, 2,2,4-trimethylpentyl group, 2,2,4-trimethyl-2-isobutylpentyl group; Corresponding groups (1,3-dimethyl-1-butenyl group, 1,3-dimethyl-2-buten-1-yl group), groups corresponding to propylene trimer (1,3-dimethyl-2-isopropylidenebutenyl Group, 1,3-dimethyl-2-isopropyl-1-butenyl group), group corresponding to butene trimer (2-ethyl-2-butyl-1-hexene) -1-yl group, 2-ethyl-2-butyl-2-hexene-1-group), groups corresponding to isobutene dimer (2,2,4-trimethyl-1-penten-1-yl group, 2, 2,4-trimethyl-2-penten-1-yl group), groups corresponding to isobutene trimer (2,2,4-trimethyl-2-isobutyl-1-penten-1-yl group, 2,2,4 _-Branched C _6-18 alkenyl group such as -trimethyl-2-isobutyl-2-penten-1-yl group). Of these, a 1,3-dimethyl-2-isopropyl-1-butenyl group is preferable.

Further, the aliphatic hydrocarbon group having a branched structure may be a perfluoroaliphatic hydrocarbon group in which at least a part of hydrogen atoms are substituted with fluorine atoms, and all the hydrogen atoms are substituted with fluorine atoms. Also good.

The branched fluoroalkyl group and / or branched fluoroalkenyl group often contains at least one fluoro-branched alkyl group and / or fluoro-branched alkenyl group as the minimum branched chain unit. Examples thereof include perfluoro C _3-6 alkyl groups such as perfluoroisopropyl group, perfluoroisobutyl group and perfluoroisopentyl group. Examples of the fluoro-branched alkenyl group include perfluoroisopropylidene group, perfluoro Examples thereof include perfluoro C _3-6 alkenyl groups such as a 1-isobutenyl group and a perfluoro-1-isopentenyl group. In particular, the smallest branched chain unit often contains at least one or both of a perfluoro C _3-6 alkyl group and a perfluoro C _3-6 alkenyl group.

As a preferred embodiment of the branched structure fluoroaliphatic hydrocarbon group, for example, a group represented by the following formula (2a) or (2b) may be mentioned.

<Hydrophilic group>
The hydrophilic group is not particularly limited as long as it is a hydrophilic group, but it is more preferably a hydroxy group. In addition, it is preferable that a hydrophilic group does not contain a fluorine atom.

<Lipophilic group>
The lipophilic group is not particularly limited as long as it is a lipophilic group, but a hydrocarbon group is more preferable because the effect of the present invention is more excellent. Another preferred embodiment of the lipophilic group includes a polyoxyalkylene ether skeleton (for example, a polypropylene glycol (PPG) skeleton, a polyethylene glycol (PEG) skeleton), and the like. The lipophilic group is preferably a group that does not contain a fluorine atom or a group that does not contain a hydroxy group.

Specific examples of the hydrocarbon group are the same as the hydrocarbon groups described for the fluorine atom-containing group. Among these, a linear or branched alkyl group (particularly, having 1 to 50 carbon atoms, preferably 5 to 20 carbon atoms, or an aromatic hydrocarbon group or a combination thereof) is preferable because the effects of the present invention are more excellent. Preferably there is.

<(Meth) acryloyloxy group>
The specific nonionic oligomer preferably has a (meth) acryloyloxy group because the formed cured film is excellent in transparency.

<Preferred embodiment 1>
The specific nonionic oligomer preferably has a repeating unit having a fluorine atom-containing group, a repeating unit having a hydrophilic group, and a repeating unit having a lipophilic group, because the effects of the present invention are more excellent. It is more preferable to have a repeating unit having a (meth) acryloyloxy group. The repeating unit is preferably a (meth) acrylate type.

(Repeating unit having a fluorine atom-containing group)
As a monomer which becomes a repeating unit having a fluorine atom-containing group, for example, a monomer represented by the following formula (F) is preferable.

Formula (F)

In formula (F), R ₁ represents a hydrogen atom or a methyl group.
In formula (F), R ₂ represents a divalent linking group. Examples of the divalent linking group include a divalent aliphatic hydrocarbon group (for example, an alkylene group, preferably 1 to 8 carbon atoms), a divalent aromatic hydrocarbon group (for example, an arylene group, preferably carbon 6-12), —O—, —S—, —SO ₂ —, —N (R) — (R: alkyl group), —CO—, —NH—, —COO—, —CONH—, or these (For example, an alkyleneoxy group, an alkyleneoxycarbonyl group, an alkylenecarbonyloxy group, and the like).
In formula (F), R ₃ represents the fluorine atom-containing group described above. Specific examples and preferred embodiments of R ₃ are as described above.

(Repeating unit having a hydrophilic group)
Examples of the monomer that is a repeating unit having a hydrophilic group include hydroxy C _2-10 such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and the like. Hydroxyalkyl (meth) acrylates such as alkyl (meth) acrylate; polyoxy C _2-4 alkylene glycol mono (meta) such as diethylene glycol mono (meth) acrylate, triethylene glycol mono (meth) acrylate, dipropylene glycol mono (meth) acrylate ) Acrylate and the like.

(Repeating unit having a lipophilic group)
Examples of the monomer that becomes a repeating unit having a lipophilic group include C _1-20 alkyl (meth) acrylate; C _5-10 cycloalkyl (meth) acrylate; adamantyl (meth) acrylate, and isobornyl (meth) acrylate. (Meth) acrylates having a bridged cyclic hydrocarbon group; aryl (meth) acrylates such as phenyl (meth) acrylate; aralkyl (meth) acrylates such as benzyl (meth) acrylate and 2-phenylethyl (meth) acrylate, Examples thereof include polyoxy C _2-4 alkylene glycol mono C _1-4 alkyl ether mono (meth) acrylate.

(Repeating unit having (meth) acryloyloxy group)
As a monomer which becomes a repeating unit having a (meth) acryloyloxy group, for example, a monomer represented by the following formula (M) is preferable.

In formula (M), R ₁ and R ₂ each independently represents a hydrogen atom or a methyl group.
In formula (M), L represents a divalent linking group. Specific examples and preferred embodiments of L are the same as R ₂ in the above formula (F).

In the specific nonionic oligomer of preferred embodiment 1, the ratio of the repeating unit having a fluorine atom-containing group is not particularly limited, but is preferably 5 to 75% by mass, more preferably 10 to 60% by mass, It is more preferably 15 to 50% by mass (particularly 20 to 40% by mass), and particularly preferably 10 to 50% by mass (particularly 25 to 35% by mass). The ratio of the repeating unit having a hydrophilic group is not particularly limited, but is preferably 5 to 50% by mass (particularly 7.5 to 40% by mass), and more preferably 10 to 30% by mass. The proportion of the repeating unit having a lipophilic group is preferably 5 to 70% by mass (particularly 5 to 60% by mass), more preferably 10 to 55% by mass, and 20 to 50% by mass. Is more preferable.

<Preferred embodiment 2>
Among the preferred embodiments 1 described above, a nonionic oligomer represented by the following formula (1) is preferable because the effect of the present invention is more excellent.

Formula (1)

In formula (1), Rf represents the fluorine atom containing group mentioned above. Specific examples and preferred embodiments of Rf are as described above.
In the formula (1), R ¹ is a divalent saturated aliphatic hydrocarbon group having 1 to 50 carbon atoms (optionally having a halogen atom, an ether bond, an ester bond, an amide bond or an aryl group) .)
In formula (1), R ² is a divalent saturated aliphatic hydrocarbon group having 1 to 100 carbon atoms (optionally having a halogen atom, an ether bond, an ester bond, an amide bond or an aryl group. .) A plurality of R ² may be the same or different.
In the formula (1), R ³ is a divalent or trivalent saturated aliphatic hydrocarbon group having 2 to 10 carbon atoms (which may optionally have an ether bond).
In formula (1), R ⁴ represents a hydrogen atom or a methyl group.
In the formula (1), R ⁵ is a monovalent saturated aliphatic hydrocarbon group having 1 to 50 carbon atoms (preferably 5 to 20 carbon atoms) (optionally halogen atom, ether bond, ester bond, amide bond or An aryl group) or an aryl group.
In formula (1), R ⁶ , R ⁷ and R ⁸ are each independently a hydrogen atom or a methyl group. A plurality of R ⁷ may be the same or different.
In the formula (1), each of n, m and q is an integer of 1 to 30, and p is an integer of 0 to 30. x is an integer of 1 or 2.

<Molecular weight>
The number average molecular weight of the specific nonionic oligomer is preferably 500 to 50,000, more preferably 1000 to 30,000, and further preferably 2,000 to 20,000.

Specific examples of the specific nonionic oligomer include Neogene's Footage 710FL, Footage 602A, and Footgent 681. Among these, the tergent 710FL is an embodiment having no (meth) acryloyloxy group, and the tergent 602A and the tergent 681 are embodiments having a (meth) acryloyloxy group.

<Content>
In the composition of the present invention, the content of the specific nonionic oligomer is not particularly limited, but may be 0.01 to 10 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound described above. The amount is preferably 0.1 to 3 parts by mass.
The specific nonionic oligomer contained in the composition of the present invention may be one type or two or more types.

(Photopolymerization initiator)
The photopolymerization initiator contained in the composition of the present invention is not particularly limited as long as it can polymerize the polyfunctional (meth) acryloyloxy group-containing compound by light.
Examples of the photopolymerization initiator include alkylphenone compounds, acetophenone compounds, benzoin ether compounds, benzophenone compounds, sulfur compounds, azo compounds, peroxide compounds, phosphine oxide compounds, and the like.
Specifically, for example, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, acetoin, butyroin, toluoin, benzyl, benzophenone, p-methoxybenzophenone, diethoxyacetophenone, α, α-dimethoxy-α-phenylacetophenone Methylphenylglyoxylate, ethylphenylglyoxylate, 4,4′-bis (dimethylaminobenzophenone), 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-dimethoxy-1, Carbonyl compounds such as 2-diphenylethane-1-one and 1-hydroxycyclohexyl phenyl ketone; Sulfur compounds such as tetramethylthiuram monosulfide and tetramethylthiuram disulfide; Azobis Azo compounds such as sobutyronitrile and azobis-2,4-dimethylvalero; peroxide compounds such as benzoyl peroxide and di-t-butyl peroxide; and the like. These may be used alone or in combination. You may use the above together.

The photopolymerization initiator is an α-hydroxyalkylphenone compound (preferably an α-hydroxyacetophenone compound) from the viewpoints of light stability, high efficiency of photocleavage, surface curability, compatibility, low volatility, low odor and the like. Compound) and α-aminoalkylphenone compounds. Examples of α-hydroxyalkylphenone compounds include 1-hydroxycyclohexyl phenyl ketone (Irgacure 184 manufactured by BASF), 2-hydroxy-2-methyl-1-phenyl-propan-1-one (Irgacure 1173 manufactured by BASF). 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one (Irgacure 2959 manufactured by BASF), 2-hydroxy-1- {4- [4 -(2-Hydroxy-2-methyl-propionyl) -benzyl] phenyl} -2-methyl-propan-1-one (Irgacure 127 manufactured by BASF) and the like. Examples of the α-aminoalkylphenone compound include 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one (Irgacure 907 manufactured by BASF).

In the composition of the present invention, the content of the photopolymerization initiator is not particularly limited, but is 0.1 to 10 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound described above. preferable.
In addition, the photoinitiator contained in the composition of this invention may be 1 type, or may be 2 or more types.

(Dry silica)
The dry silica contained in the composition of the present invention is not particularly limited as long as it is silica produced or melted in the gas phase. The dry silica may be subjected to a surface treatment.
More specifically, examples of the dry silica include silicon halides such as monochlorosilane, dichlorosilane, trichlorosilane, and tetrachlorosilane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, hexa A mixed gas of a silicon-containing compound such as siloxanes such as methyldisiloxane and octamethyltrisiloxane and a flammable gas such as oxygen (if necessary, a diluent gas such as nitrogen or an auxiliary combustion gas such as hydrogen is used. Silica produced by a method of burning while jetting from a burner; silica produced by a method of heat-treating metallic silicon powder in a flame or other high temperature and oxidizing atmosphere; crushed quartz or silica By melting the agglomerates in a flame and then re-solidifying them Silica produced, and silica, etc. These surface-treated with various silane coupling agents and the like Te.

<Hydrophobic treatment>
For the reason that the effect of the present invention is more excellent, dry silica is preferably subjected to surface treatment, and more preferably subjected to hydrophobic treatment.
Here, the hydrophobic treatment is intended to be performed with a hydrophobic treatment agent. Usually, by the hydrophobization treatment, the silanol group on the dry silica surface reacts with the hydrophobizing surface treatment agent to introduce the hydrophobic group on the dry silica surface. The hydrophobic group is not particularly limited, and examples thereof include an alkyl group, a dimethylsilyl group, a trimethylsilyl group, an alkylsilyl group, and a methacrylsilyl group.
The hydrophobizing agent is not particularly limited, and examples thereof include siloxane, silazane, chlorosilane, alkoxysilane, alkylsilane, and silicone oil.
Examples of the siloxane include octamethylcyclotetrasiloxane. Examples of the silazane include hexamethyldisilazane. Examples of the chlorosilane include dimethyldichlorosilane. Examples of the alkoxysilane include For example, methyltrimethoxysilane, methyltriethoxysilane, octyltrimethoxysilane and the like can be mentioned. Examples of the alkylsilane include octylsilane and the like, and examples of the silicone oil include dimethylsilicone oil and methylphenylsilicone oil. , Chlorophenyl silicone oil, methyl hydrogen silicone oil, alkyl modified silicone oil, fluorine modified silicone oil, polyether modified silicone oil, alcohol modified Silicone oil, amino modified silicone oil, epoxy modified silicone oil, epoxy / polyether modified silicone oil, phenol modified silicone oil, carboxyl modified silicone oil, mercapto modified silicone oil, (meth) modified silicone oil, α-methylstyrene modified silicone oil Etc.

<Average primary particle size>
The average primary particle diameter of the dry silica contained in the composition of the present invention is 100 nm or less. Especially, it is preferable that it is 50 nm or less from the reason which the effect of this invention is more excellent. Although a minimum in particular is not restrict | limited, From a viewpoint of transparency and antiblock property, it is preferable that it is 10 nm or more.
In this specification, an average primary particle diameter shall mean the 50% volume cumulative diameter (D50) measured using the laser diffraction type particle size distribution measuring apparatus.

Commercially available products can be used as the dry silica, and specific examples thereof include Aerosil® 90, AEROSIL® 130, AEROSIL® 150, AEROSIL® 200, AEROSIL® 300, AEROSIL® 380, AEROSIL® OX50, AEROSIL® EG50, AEROSIL® TT600 manufactured by Nippon Aerosil Co., Ltd. , AEROSIL R972, AEROSIL R972V, AEROSIL R972CF, AEROSIL R974, AEROSIL R976, AEROSIL R812, AEROSIL RX200, AEROSIL R104, AEROSIL R106, AEROSIL R81 2S, AEROSIL R816, AEROSIL R7200, AEROSIL R8200, AEROSIL R9200, and the like. Among them, AEROSIL R972, AEROSIL R972V, AEROSIL R972CF, AEROSIL R974, AEROSIL R976, AEROSIL RX200, AEROSIL R104, AEROSILR12 AEROSIL R812S, AEROSIL R816, AEROSIL R7200, AEROSIL R8200, and AEROSIL R9200 are preferred.

<Content>
In the composition of the present invention, the content of dry silica is not particularly limited, but is preferably 1 to 30 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound described above.
The dry silica contained in the composition of the present invention may be one type or two or more types.

〔solvent〕
The composition of the present invention preferably further contains a solvent from the viewpoint of good coatability.
A solvent will not be specifically limited if it can melt | dissolve each component mentioned above. For example, ketones such as methyl ethyl ketone (MEK), methyl isobutyketone (MIBK), cyclohexanone; alcohols such as propylene glycol monomethyl ether (PGME) and isopropyl alcohol (IPA); cycloalkanes such as cyclohexane; toluene, xylene And aromatic hydrocarbon compounds such as benzyl alcohol. Among these, MEK, cyclohexanone, and MIBK are preferable, and MEK is more preferable from the viewpoint of excellent solubility, drying property, and paintability.
A solvent can be used individually or in combination of 2 types or more, respectively.

In the composition of the present invention, the content of the solvent is not particularly limited, but from the viewpoint of coatability, it is preferably 5 to 85% by mass in the total amount of the composition.

[Other ingredients]
The composition of this invention may contain other components other than the component mentioned above. Such components include, for example, UV absorbers, fillers, anti-aging agents, antistatic agents, flame retardants, adhesion promoters, dispersants, antioxidants, antifoaming agents, matting agents, and light stabilizers. , Dyes and pigments.

[Method for preparing ultraviolet curable resin composition]
The method for preparing the composition of the present invention is not particularly limited, and examples thereof include a method of mixing the above-described components using a stirrer or the like.

[Hardened film]
The cured film of the present invention is not particularly limited as long as it is formed from the above-described composition of the present invention.
The method for producing the cured film of the present invention is not particularly limited. For example, the above-described composition of the present invention is applied on a substrate, and a coating film is formed on the substrate by drying as necessary. Examples include a method of curing the obtained coating film by irradiating with ultraviolet rays.
The method for applying the composition of the present invention is not particularly limited, and a known method such as brush coating, flow coating, dip coating, spray coating, spin coating or the like can be employed.
The temperature for drying the coating film is not particularly limited, but is preferably 20 to 110 ° C.
The irradiation amount (integrated light amount) when irradiating with ultraviolet rays is not particularly limited, but is preferably 50 to 3,000 mJ / cm ² from the viewpoint of fast curability and workability. The apparatus used for irradiating ultraviolet rays is not particularly limited. For example, a conventionally well-known thing is mentioned. Heating may be used in combination for curing.
The thickness of the cured film of the present invention is not particularly limited, but is preferably 0.1 to 100 μm, and more preferably 1 to 5 μm.

[Laminate]
The laminated body of this invention will not be restrict | limited especially if a base material and the cured film mentioned above are provided. The cured film is as described above. Moreover, the laminated body of this invention may be further equipped with the resin layer (for example, acrylic resin layer) between a base material and a cured film from viewpoints, such as adhesiveness.
The method for forming the cured film is as described above. The method for forming the resin layer is the same as the method for producing the cured film described above.
Hereinafter, the base material used for the laminated body of this invention is demonstrated.

〔Base material〕
The said base material is not specifically limited, As a constituent material, plastics, rubber | gum, glass, a metal, a ceramic etc. are mentioned, for example.
Here, the plastic may be either a thermosetting resin or a thermoplastic resin. Specific examples thereof include polyethylene terephthalate (PET), cycloolefin polymer (homopolymer, copolymer, hydrogenated). For example, COP and COC), polymethyl methacrylate resin (PMMA resin), polycarbonate resin, polystyrene resin, acrylonitrile / styrene copolymer resin, polyvinyl chloride resin, acetate resin, ABS resin, polyester resin, polyamide resin, etc. Is mentioned.
The base material may be subjected to a surface treatment such as a corona treatment.
The form of the substrate is not particularly limited, but is preferably a film.

Here, COC is a copolymer (cycloolefin copolymer) of tetracyclododecene and an olefin such as ethylene. COP is a polymer (cycloolefin polymer) obtained by ring-opening polymerization of norbornene and hydrogenation.
Examples of COC and COP structures are shown below.

[Usage]
The cured film and laminate of the present invention can be used for, for example, electronic image display devices, eyeglass lenses, protective covers for lighting (particularly LED lighting), solar cell module members, and the like.
Examples of the electronic image display device include display-use electronic device components such as a personal computer, a television, a touch panel, and a wearable terminal (for example, a computer terminal that can be worn on the body such as a glasses type or a wrist watch type).
The laminate of the present invention can be built in or attached to an electronic image display device or the like (for example, sticking from outside). When the laminate of the present invention is built in an electronic image display device or the like, it can be applied to a portion other than the reflector, for example. Specifically, for example, it can be applied to a lens sheet, a diffusion sheet, and a light guide plate.
The composition of the present invention can be directly applied to an electronic image display device or the like to form a cured film.

Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these.

[Preparation of UV-curable resin composition]
Each component shown in Table 1 below is added to MEK (methyl ethyl ketone) in the composition shown in the same table (parts by mass of solid content), and mixed using a stirrer to prepare each ultraviolet curable resin composition (Example) And Comparative Example) (solid content concentration: 40% by mass).
In Table 1, the value shown in the column of solid content (%) represents the solid content concentration (% by mass) contained in each component.

[Manufacture of laminates]
Clearance of each UV curable resin composition obtained on a polyethylene terephthalate film (PET film, trade name: Lumirror U-403, thickness: 125 μm, manufactured by Toray Industries, Inc.) to a thickness of 2 μm after drying. The coating was applied at the setting, and this was dried at 80 ° C. for 1 minute. Thereafter, ultraviolet rays (UV) are irradiated using a GS UV SYSTEM manufactured by Kawaguchi Spring Co., Ltd. (UV irradiation conditions: illuminance 300 mW / cm ² , integrated light amount 300 mJ / cm ² , UV irradiation apparatus is a high-pressure mercury lamp) and cured. A laminate comprising a PET film and a cured film was obtained.

[Evaluation]
The following evaluation was performed about the cured film of the obtained laminated body.

<Recoatability>
(Contact angle)
A 10 μm ³ water droplet was dropped onto the surface of the cured film at a rate of 2 μm ³ / sec, and the contact angle [°] was measured using a contact angle measuring device (OCA20, manufactured by Data Physics). The results are shown in Table 1. The smaller the contact angle, the better the recoatability. From the viewpoint of recoatability, the contact angle is preferably 72 ° or less.

(Dyne number)
The dyne number (before heating) [dyne / cm] of the surface of the cured film was measured using a dyne pen (wetting reagent). The results are shown in Table 1. The greater the dyne number, the better the recoatability. From the viewpoint of recoatability, the dyne number (before heating) is preferably 32 or more.
Further, the obtained laminate was heated (150 ° C. × 2 hours), and then the dyne number (after heating) [dyne / cm] of the surface of the cured film was measured in the same manner as before heating. The results are shown in Table 1.
In Table 1, “<30” indicates that the dyne number is smaller than 30.

<Haze>
The obtained laminate was cut into squares (30 mm × 30 mm), and haze (%) was measured using a haze meter (HM150, manufactured by Murakami Color Research Laboratory Co., Ltd.). The results are shown in Table 1. The smaller the haze, the better the transparency.

<Easily slippery (blocking)>
A hard coat (clear hard coat) coating film was rubbed against the cured film of the obtained laminate, and “◯” was slid without blocking, and “X” was slid without blocking. The results are shown in Table 1.

<Stability at low temperature (5 ℃ / -10 ℃)>
The obtained ultraviolet curable resin composition was allowed to stand in an environment of 5 ° C. and −10 ° C., and no change was observed in the appearance, “◯”, cloudiness (for example, sediment or Turbidity was observed when turbidity was generated due to the formation of suspended matter. The results are shown in Table 1. Note that “◯ (increased haze)” indicates that the appearance was not changed but the haze was increased when the cured film was formed.

The detail of each component described in Table 1 is as follows. The specific nonionic oligomers 1 to 3 correspond to the above-mentioned specific nonionic oligomer (nonionic oligomer represented by the above formula (1)), and the comparative nonionic oligomers 1 to 3 are the above-mentioned specific nonionic oligomers. Not applicable. Of the polyfunctional (meth) acryloyloxy group-containing compounds 1 to 7, the polyfunctional (meth) acryloyloxy group-containing compounds 3 to 6 correspond to the above-mentioned compound A, of which the polyfunctional (meth) acryloyloxy group The contained compounds 3 to 4 correspond to the compound represented by the above formula (N).
Polyfunctional (meth) acryloyloxy group-containing compound 1: Miramer M-600 (dipentaerythritol hexaacrylate, manufactured by Miwon)
Polyfunctional (meth) acryloyloxy group-containing compound 2: Polyfunctional acryloyloxy group-containing compound having a urethane group obtained by reacting hexamethylene diisocyanate (HDI) and dipentaerythritol pentaacrylate (DPPA) Equivalent ratio of isocyanate group concentration in HDI to total active hydrogen group concentration (NCO / active hydrogen group) = 0.6, weight average molecular weight: 944, number of (meth) acryloyloxy groups in one molecule: 8-10 )
Polyfunctional (meth) acryloyloxy group-containing compound 3: NK ester A-9300 1CL (ε-caprolactone modified tris- (2-acryloxyethyl) isocyanurate (the following structure, where l + m + n = 1), Shin-Nakamura Chemical (Manufactured by Kogyo)

Polyfunctional (meth) acryloyloxy group-containing compound 4: NK ester A-9300 (ethoxylated isocyanuric acid triacrylate (the following structure), manufactured by Shin-Nakamura Chemical Co., Ltd., average molecular weight Mw: 423, viscosity: 1000 mPa · s (25 ℃))

Polyfunctional (meth) acryloyloxy group-containing compound 5: TMPEOTA (trimethylolpropane ethoxytriacrylate (the following structure), manufactured by Daicel-Ornesque, average molecular weight Mw: 428, viscosity: 60 mPa · s (25 ° C.))

Polyfunctional (meth) acryloyloxy group-containing compound 6: Light acrylate BP-4EAL (EO (ethylene oxide) adduct diacrylate (structure shown below) of bisphenol A, manufactured by Kyoeisha Chemical Co., Ltd., viscosity: 1,000 to 1,300 mPa・ S (25 ℃)

Polyfunctional (meth) acryloyloxy group-containing compound 7: TMPTA (trimethylolpropane triacrylate (the following structure), manufactured by Daicel-Ornesque, average molecular weight Mw: 286, viscosity: 100 mPa · s (25 ° C.))

Specific Nonionic Oligomer 1: Footage 602A (a specific nonionic oligomer having a (meth) acryloyloxy group, manufactured by Neos)
Specific nonionic oligomer 2: Footage 681 (specific nonionic oligomer having a (meth) acryloyloxy group, manufactured by Neos)
Specific Nonionic Oligomer 3: Footage 710FL (a specific nonionic oligomer having no (meth) acryloyloxy group, manufactured by Neos)
Comparative nonionic oligomer X1: Footent FTX-218 (manufactured by Neos)
-Comparative nonionic oligomer X2: Footage 228P (manufactured by Neos)
Comparative nonionic oligomer X3: BYK-3440 (by Big Chemie Japan)
Photopolymerization initiator 1: Irgacure 2959 (α-hydroxyacetophenone photopolymerization initiator, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one Manufactured by BASF)
Photopolymerization initiator 2: Irgacure 907 (α-aminoalkylphenone photopolymerization initiator, 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one, manufactured by BASF)
Photopolymerization initiator 3: Irgacure 127 (α-hydroxyacetophenone photopolymerization initiator, 2-hydroxy-1- {4- [4- (2-hydroxy-2-methyl-propionyl) -benzyl] phenyl} -2 -Methyl-propan-1-one (manufactured by BASF)
-Dry silica 1: AEROSIL R972 (hydrophobized dry silica, average primary particle size: 12 nm, manufactured by Nippon Aerosil Co., Ltd.)
Wet silica 1: MIBK-ST (wet silica, average particle size: 10 to 20 nm, manufactured by Nissan Chemical Industries, Ltd.)

As can be seen from Table 1, the cured films obtained from the compositions of Examples 1 to 11 in which the specific nonionic oligomer and dry silica were used in combination exhibited excellent recoatability. Among them, the cured films obtained from the compositions of Examples 1 to 6 and 8 to 10 containing Compound A described above as the polyfunctional (meth) acryloyloxy group-containing compound showed more excellent recoating properties. Among them, the cured films obtained from the compositions of Examples 1, 2, 4 to 6 and 8 to 10 in which the specific nonionic oligomer has a (meth) acryloyloxy group showed excellent transparency.
On the other hand, the cured films obtained from the compositions of Comparative Examples 1 to 3 that did not contain the specific nonionic oligomer and the composition of Comparative Example 4 that did not contain the dry silica had insufficient recoatability.

Claims

A polyfunctional (meth) acryloyloxy group-containing compound;
A nonionic oligomer having a fluorine atom-containing group, a hydrophilic group and a lipophilic group;
A photopolymerization initiator;
An ultraviolet curable resin composition containing dry silica having an average primary particle size of 100 nm or less.
The ultraviolet curable resin according to claim 1, wherein the polyfunctional (meth) acryloyloxy group-containing compound includes a polyfunctional (meth) acryloyloxy group-containing compound having a partial structure represented by the following general formula (A). Composition.
* -CH 2 CH 2 O- * (A)
In formula (A), * represents a bonding position.
The ultraviolet curable resin composition according to claim 1 or 2, wherein the polyfunctional (meth) acryloyloxy group-containing compound comprises a polyfunctional (meth) acryloyloxy group-containing compound having a urethane group.
The ultraviolet curable resin composition according to any one of claims 1 to 3, wherein the nonionic oligomer has a (meth) acryloyloxy group.
The ultraviolet curable resin composition according to any one of claims 1 to 4, wherein the photopolymerization initiator is an α-hydroxyalkylphenone compound or an α-aminoalkylphenone compound.
The ultraviolet curable resin composition according to claim 5, wherein the photopolymerization initiator is an α-hydroxyacetophenone compound.
The ultraviolet curable resin composition according to any one of claims 1 to 6, wherein the dry silica is a dry silica subjected to a hydrophobic treatment.
The content of the nonionic oligomer is 0.01 to 10 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound.
The content of the photopolymerization initiator is 0.1 to 10 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound,
The ultraviolet curable type according to any one of claims 1 to 7, wherein a content of the dry silica is 1 to 30 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acryloyloxy group-containing compound. Resin composition.
A cured film formed from the ultraviolet curable resin composition according to any one of claims 1 to 8.
A laminate comprising a substrate and the cured film according to claim 9.
The laminate according to claim 10, which is a functional film constituting an electronic device component.