JP2002166502A - Hard coat film having light fastness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film not damaging the adhesiveness with a layer comprising an ionizing radiation curable resin layer and having scratch resistance and excellent in light fastness. SOLUTION: The hard coat film is formed by laminating a substrate layer and an ionizing radiation curable resin layer on at least one surface of a transparent polymer film in this order. The substrate layer contains an ultraviolet absorbable acrylic resin of a copolymer containing at least either one of 2-(2'- hydroxy-5'-methacryloxyethylphenol)-2H-benzotriazole and (meth)acrylic ester selected from butylacrylate, butylmethacrylate and 2-ethylhexyl acrylate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard coat film, and more particularly, to an improvement in light resistance of a hard coat film having a scratch resistant layer made of an ionizing radiation curable resin layer on a base film.

[0002]

2. Description of the Related Art Conventionally, membrane switches for electric appliances and touch panels such as cash dispensers have been used.
A hard coat film is used in which a layer having an abrasion resistance made of an ionizing radiation-curable resin layer is treated on the surface of a base film directly or via an undercoat layer,
In recent years, use for portable information terminals and the like, which are frequently used outdoors, has been promoted.

However, such a hard coat film used outdoors or the like is deteriorated in a short period of time unless a means for improving light resistance is used in some way.
The performance as a hard coat film cannot be maintained.

Therefore, a method of incorporating a low molecular weight ultraviolet absorber into an ionizing radiation-curable resin layer or an undercoat layer between the ionizing radiation-curable resin layer and a base film has been studied. However, when an ultraviolet absorber is contained in the ionizing radiation-curable resin layer, the ultraviolet absorber becomes a curing obstacle,
There is a problem that curing is not performed until the performance such as abrasion resistance is sufficiently exhibited. Further, when the undercoat layer contains an ultraviolet absorber, the ultraviolet absorber bleeds over time, thereby inhibiting the adhesion with the ionizing radiation-curable resin layer,
There is a problem that the ionizing radiation-curable resin layer is easily peeled off from the undercoat layer, and the scratch resistance is lost.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a hard coat film which does not impair the adhesiveness to an abrasion-resistant layer composed of an ionizing radiation-curable resin layer and which is excellent in light resistance. With the goal.

[0006]

The light-resistant hard coat film of the present invention is obtained by laminating an undercoat layer and an ionizing radiation-curable resin layer on at least one surface of a transparent polymer film in this order. Wherein the undercoat layer contains an ultraviolet absorbing resin.

The light-resistant hard coat film of the present invention is characterized in that the ultraviolet absorbing resin is an ultraviolet absorbing acrylic resin.

The light-resistant hard coat film of the present invention is characterized in that the ultraviolet-absorbing acrylic resin is a monomer component having an ultraviolet-absorbing group as 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H. -Characterized by containing benzotriazole.

Further, the light-resistant hard coat film of the present invention is characterized in that the ultraviolet-absorbing acrylic resin contains a (meth) acrylic acid ester having an alkyl group having 2 to 12 carbon atoms as a monomer component. Is what you do.

The light-resistant hard coat film of the present invention is characterized in that any one or more of butyl acrylate, butyl methacrylate and 2-ethylhexyl acrylate are used as the (meth) acrylate. It is a feature.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the light-resistant hard coat film of the present invention will be described in detail.

The hard coat film of the present invention is obtained by laminating an undercoat layer and an ionizing radiation curable resin layer on at least one surface of a transparent polymer film in this order.

As the transparent polymer film, those which do not impair the transparency, such as polyester, polycarbonate, polyethylene, polypropylene, triacetyl cellulose, polyvinyl chloride, acryl, polystyrene, polyamide, and polyimide, can be used. Especially the biaxially stretched polyester film has mechanical strength,
This is preferable because dimensional stability is improved. The thickness can be appropriately selected depending on the material to be applied, but is generally 25 to 500 μm, preferably 50 to 200 μm.
It is.

The undercoat layer is a layer that enhances the adhesiveness to the ionizing radiation-curable resin layer and improves the light resistance of the hard coat film, and contains an ultraviolet absorbing resin. Specific examples of the ultraviolet absorbing resin include an ultraviolet absorbing acrylic resin, and a copolymer of benzotriazole represented by the following formula and (meth) acrylic acid ester is preferable.

[0015]

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The above-mentioned benzotriazole is a compound that imparts ultraviolet absorption to the resin, and is not more than 80% by weight, preferably not more than 60% by weight, more preferably not more than 55% by weight of the resin.

Specific examples of the (meth) acrylic acid ester include methyl (meth) acrylate and ethyl (meth) acrylate.
Examples include acrylate, propyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate, and one or more of these can be used.

Of these (meth) acrylates, (meth) acrylates having an alkyl group having 2 to 12 carbon atoms are particularly preferred.
It is preferable to contain at least one acrylate.

By incorporating a (meth) acrylate having an alkyl group having 2 to 12 carbon atoms, the adhesion to the ionizing radiation-curable resin layer can be enhanced. Specific examples of such (meth) acrylic acid esters include butyl acrylate, butyl methacrylate, and 2-ethylhexyl acrylate.

The proportion of the (meth) acrylate having an alkyl group having 2 to 12 carbon atoms in the monomer is not particularly limited, but is preferably not less than 5% by weight in order to improve the adhesion to the ionizing radiation-curable resin layer. It is preferable to include them. However, when a monomer having a relatively low glass transition temperature (Tg) of a homopolymer such as butyl acrylate is used alone, the glass transition temperature of the undercoat layer becomes low, and blocking or the like may occur in the coating film. It is preferable to use together with another monomer capable of increasing the glass transition temperature. Further, as the obtained ultraviolet absorbing acrylic resin, the glass transition temperature is-
It is 20 ° C. or higher, preferably 0 ° C. or higher, and the upper limit is 65 ° C. or lower, preferably 50 ° C. or lower. By setting the content in such a range, the occurrence of blocking of the undercoat layer can be suppressed, and the adhesiveness between the transparent polymer film and the ionizing radiation-curable resin layer can be increased.

Further, the (meth) acrylic acid ester may partially have a functional group such as a carboxyl group, a hydroxyl group, an amino group, an acetoacetoxyethyl group and an epoxy group. Examples of the monomer having such a functional group include (meth) acrylic acid, β-carboxyethyl acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate,
4-hydroxybutyl (meth) acrylate, diethylene glycol mono (meth) acrylate, aminomethyl (meth) acrylate, dimethylaminomethyl (meth)
Examples include acrylate, dimethylaminopropyl (meth) acrylate, acetoacetoxyethyl (meth) acrylate, and glycidyl (meth) acrylate.

By adding such a functional group-containing monomer, the cohesive strength of the coating film can be improved or a crosslinking point can be provided.

Further, a monomer such as vinyl acetate, vinyl propionate, vinyl ether, styrene or (meth) acrylonitrile may be added for the purpose of improving the adhesion to the transparent polymer film. In addition, improvement of the cohesive force of the coating film,
Examples of monomers that can be added for imparting a crosslinking point include monomers containing a carboxyl group such as itaconic acid, crotonic acid, maleic acid, and maleic anhydride, monomers containing a hydroxyl group such as allyl alcohol, and amino groups such as vinylpyridine. Examples of the monomer include.

The ultraviolet absorbing acrylic resin used in the undercoat layer of the present invention has an absorption property for light of 290 to 400 nm, and does not cause bleeding due to the ultraviolet absorbing group introduced into the acrylic resin. It does not hinder the adhesion to the ionizing radiation-curable resin layer.

When the transparent polymer film is an acrylic resin, the above-mentioned UV-absorbing acrylic resin has good adhesiveness with them and can be used alone. When a synthetic resin other than the system resin is used, it is preferable to use a resin having good adhesiveness to the transparent polymer film in order to enhance the adhesiveness to the transparent polymer film. Examples of such a resin include a polyester resin and a vinyl acetate resin when the transparent polymer film is a polyester resin.

The undercoat layer may be made of a resin having good adhesion to the transparent polymer film, an ultraviolet absorbing acrylic resin, a thermoplastic acrylic, a thermosetting polyurethane, or the like as long as these effects are not impaired. Resin can be contained. However, the above-mentioned UV-absorbing acrylic resin is at least 5% by weight of the resin constituting the undercoat layer. The content is preferably at least 50% by weight, more preferably at least 80% by weight. The resin for improving the adhesiveness to the transparent polymer film is 95% by weight or less of the resin constituting the undercoat layer,
Preferably, the content is 20% by weight or less. By setting the content in such a range, not only the light resistance is imparted, but also the adhesion to the ionizing radiation-curable resin layer and the adhesiveness to the transparent polymer film are both increased, and the resistance to the ionizing radiation-curable resin layer is improved. Does not reduce abrasion.

The thickness of the undercoat layer as described above is not particularly limited as long as it does not impair the function as the undercoat layer. From the viewpoint of not reducing the scratch resistance of the ionizing radiation-curable resin layer when the curable resin layer is laminated, the lower limit is 0.2 μm or more, preferably 0.5 μm or more, more preferably 1 μm. The upper limit is 15 μm or less, preferably 10 μm
It is desirable that the thickness be 5 μm or less.

The ionizing radiation-curable resin layer is present on the surface of the hard coat film of the present invention, and has a high surface hardness formed from a paint which can be cross-linked and cured by irradiation with ionizing radiation (ultraviolet rays or electron beams). A resin layer having excellent abrasion properties, and is composed of one layer or two or more layers. In particular, a multi-layered ionizing radiation-curable resin layer such as a lamination of a first ionizing radiation-curable resin layer emphasizing adhesion to an undercoat layer and a second ionizing radiation-curable resin layer emphasizing surface hardness. Is effective.

As the ionizing radiation-curable coating material for forming such an ionizing radiation-curable resin layer, one or a mixture of two or more of a photopolymerizable prepolymer and a photopolymerizable monomer can be used. .

As the photopolymerizable prepolymer, an acrylic prepolymer having two or more acryloyl groups in one molecule and having a three-dimensional network structure by crosslinking and curing is particularly preferably used. As the acrylic prepolymer, urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate and the like can be used.

Examples of the photopolymerizable monomer include trimethylolpropane trimethacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate, dipentaerythritol monohydroxypentaacrylate, neopentyl glycol diacrylate, tripropylene glycol triacrylate, and diethylene glycol diacrylate. And polyfunctional monomers such as 1,6-hexanediol diacrylate.

In addition, various additives can be added to such an ionizing radiation-curable paint. Particularly when ultraviolet rays are used for curing, the crosslinking curability and the hardness of the crosslinked cured coating film are further improved. For this purpose, it is preferable to add a photopolymerization initiator, an ultraviolet sensitizer and the like.

As the photopolymerization initiator, acetophenone,
Examples thereof include benzophenone, Michler's ketone, benzoin, benzylmethyl ketal, benzoin benzoate, α-acyloxime ester, and thioxanthones. Examples of the ultraviolet sensitizer include n-butylamine, triethylamine, and tri-n-butylphosphine.

The thickness of the ionizing radiation-curable resin layer as described above is not particularly limited as long as it does not impair the function as the ionizing radiation-curable resin layer. From the viewpoint of preventing the curl due to extreme shrinkage of the coating film while providing sufficient scratch resistance, the lower limit is 1 μm or more, preferably 2 μm or more, more preferably 3 μ or more, and the upper limit is 20 μm or less, preferably 15 μm. It is desirable that the thickness be 10 μm or less.

In the undercoat layer or the ionizing radiation-curable resin layer as described above, a matting agent, a plasticizer, an antioxidant, a coloring agent, a lubricant, an antistatic agent, etc. Various additives such as a flame retardant, an antibacterial agent, and a fungicide can be contained.

The hard coat film of the present invention is prepared by using the resin constituting the undercoat layer described above and the ionizing radiation-curable coating material constituting the ionizing radiation-curable resin layer by using an additive or a diluting solvent as required. It can be formed by preparing as a coating liquid, applying to at least one surface of the transparent polymer film by a conventionally known coating method, drying and curing. When the ionizing radiation-curable resin layer is cured, 100 to 400 nm, preferably 200 to 40 nm emitted from an ultrahigh-pressure mercury lamp, high-pressure mercury lamp, low-pressure mercury lamp, carbon arc, metal halide lamp, or the like.
It is performed by irradiating ionizing radiation such as ultraviolet rays in a wavelength region of 0 nm or electron beams in a wavelength region of 100 nm or less emitted from a scanning or curtain type electron beam accelerator.

[0037]

Embodiments of the present invention will be described below.
The “parts” and “%” are based on weight unless otherwise specified.

Example 1 An undercoat layer coating solution having the following composition was applied to one surface of a 100 μm-thick polyester film (Cosmoshine A4100: Toyobo Co., Ltd.)
By drying, an undercoat layer having a thickness of about 3 μm was formed, and the adhesion of the undercoat layer to the polyester film was evaluated. The ultraviolet absorbing acrylic resin used here is a copolymer of 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H-benzotriazole, methyl methacrylate and butyl acrylate.

<Coating liquid for undercoat layer>-UV-absorbing acrylic resin (PUVA-50MBA-30T <solid content 30%>: Otsuka Chemical Co., Ltd.) 8.0 parts-Thermoplastic acrylic resin (Acridic A-195 <Solid content 40%>: Dainippon Ink and Chemicals, Inc. 42.0 parts ・ Polyester resin (Acryt ER20 <Solid content 40%)
>: Taisei Kakosha> 12.0 parts ・ Methyl ethyl ketone 18.6 parts ・ Cyclohexanone 43.4 parts

Next, a coating liquid for an ionizing radiation-curable resin layer having the following composition is applied to the undercoat layer, dried, and cured by irradiating ultraviolet rays for 1 to 2 seconds with a high-pressure mercury lamp. A hard coat film was produced by forming an ionizing radiation-curable resin layer, and the adhesion of the ionizing radiation-curable resin layer to the undercoat layer and the scratch resistance of the surface of the ionizing radiation-curable resin layer were evaluated.

<Coating liquid for ionizing radiation-curable resin layer> ・ Ionizing radiation-curable paint (Diabeam UR6530: Mitsubishi Rayon Co., Ltd.) 40.0 parts ・ Photopolymerization initiator (Irgacure 651: Ciba Specialty Chemicals) 0 .6 parts ・ Methyl ethyl ketone 40.0 parts ・ Toluene 40.0 parts

[Evaluation of Adhesiveness] The adhesiveness of the undercoat layer to the transparent polymer film and the ionizing radiation-curable resin layer to the undercoat layer were evaluated by a cross-cut tape method (JIS-K5400). As a result of the peeling test by the cross-cut tape method, those in which the area of the cross-cut portion was peeled by 30% or more were evaluated as “x”.
%, And those where the cross section did not peel off at all were evaluated as “○”. Table 1 shows the results.

[Evaluation of Scratch Resistance] The surface of the ionizing radiation-curable resin layer was rubbed 10 times with steel wool # 0000 under a load of 150 g, and the surface was visually evaluated for scratches. The sample was evaluated as "O", and the sample with scratches was evaluated as "X".

Further, regarding this hard coat film,
The light resistance was evaluated as follows. [Evaluation of light fastness] Using an accelerating tester (ultraviolet fade meter FAL-5: Suga Test Instruments Co., Ltd.) having 200 hours of irradiation equivalent to one year of ultraviolet irradiation in the outdoors, ultraviolet light for 600 hours After irradiation and light resistance test, the adhesiveness of the ionizing radiation-curable resin layer was evaluated. Table 1 shows the results.

[0045]

[Table 1]

[Examples 2 to 4] An undercoat layer was formed in the same manner as in Example 1 except that the amounts of the ultraviolet absorbing acrylic resin and the polyester resin used were changed as shown in Table 2. A hard coat film was manufactured. The undercoat layer and the hard coat film were evaluated in the same manner as in Example 1 for adhesion, scratch resistance, and light resistance.
Table 1 shows the results.

[0047]

[Table 2]

Comparative Example 1 An undercoat layer was formed in the same manner as in Example 1 except that the undercoat layer coating solution used in Example 1 was changed to the undercoat layer coating solution having the following composition. Formed to produce a hard coat film. The undercoat layer and the hard coat film were evaluated in the same manner as in Example 1 for adhesion, scratch resistance, and light resistance. Table 1 shows the results.

<Coating liquid for undercoat layer> Thermoplastic acrylic resin (Acridic A-195 <solid content 40%>: Dainippon Ink and Chemicals, Inc.) 57.0 parts Polyester resin (Acryt ER20 <solid content) 40%
>: Taisei Chemical Co., Ltd.> 3.0 parts ・ Ultraviolet absorber (Chemisorb 79: Chemipro Kasei)
4 parts ・ Methyl ethyl ketone 18.6 parts ・ Cyclohexanone 43.4 parts

Comparative Example 2 An undercoat layer was formed by using an undercoat layer coating liquid obtained by removing the ultraviolet absorber from the undercoat layer coating liquid of Comparative Example 1, and then the ionizing radiation of Example 1 was used. A hard coat film was formed in the same manner as in Example 1 except that an ionizing radiation-curable resin layer was formed using an ionizing radiation-curable resin layer coating liquid having the following composition instead of the curable resin layer coating liquid. Manufactured. The undercoat layer and the hard coat film were evaluated in the same manner as in Example 1 for adhesion, scratch resistance, and light resistance. Table 1 shows the results.

<Coating liquid for ionizing radiation-curable resin layer> ・ Ionizing radiation-curable paint (Diabeam UR6530: Mitsubishi Rayon) 40.0 parts ・ Photopolymerization initiator (Irgacure 651: Ciba Specialty Chemicals) 0 .6 parts ・ Ultraviolet absorber (Chemisorb 79: Chemipro Kasei) 4.
0 parts ・ Methyl ethyl ketone 40.0 parts ・ Toluene 40.0 parts

Comparative Example 3 Comparative Example 1 was carried out in the same manner as in Comparative Example 1 except that the undercoat layer was formed using the undercoat layer coating liquid obtained by removing the ultraviolet absorber from the undercoat layer coating liquid. Thus, a hard coat film was manufactured by forming an undercoat layer. The undercoat layer and the hard coat film were evaluated in the same manner as in Example 1 for adhesion, scratch resistance, and light resistance. Table 1 shows the results.

As is clear from the results shown in Table 1, the hard coat films of the examples of the present invention exhibited excellent light fastness. In addition, when only the ultraviolet absorbing acrylic resin was used as the resin of the undercoat layer (Example 4), the adhesiveness to the polyester film was slightly lowered, indicating that the combined use with the polyester resin was suitable. Was.

On the other hand, in the hard coat film of Comparative Example 1, since the low molecular weight ultraviolet absorber was used in the undercoat layer, the ultraviolet absorber bleeded, and the adhesion and ionization between the undercoat layer and the transparent polymer film were observed. The adhesiveness between the radiation-curable resin layer and the undercoat layer was reduced, and the adhesiveness after the light resistance test was also poor.

In the hard coat film of Comparative Example 2, since the ionizing radiation-curable resin layer contains an ultraviolet absorber, the ionizing radiation-curable resin layer hardly cures in a short time, and is extremely poor in abrasion resistance. As well as
The adhesion after the light resistance test was also poor.

Further, since the hard coat film of Comparative Example 3 did not use any material having an ultraviolet absorbing property, the adhesiveness provided at the beginning was completely lost after the light resistance test, and the light resistance was extremely high. Was inferior.

[Examples 5 to 19] Production of UV-absorbing resin 9 parts of ethyl acetate and 12 parts of methyl ethyl ketone were placed in a reaction vessel equipped with a stirrer, a condenser, a thermometer and a nitrogen inlet tube.
And 9 parts of toluene, and stirred while passing nitrogen through.
Heated to 0 ° C.

On the other hand, of the monomer components shown in Table 3, components other than the benzotriazole component (parts by weight shown in Table 3)
And ethyl acetate 6 parts, methyl ethyl ketone 8 parts, toluene 6 parts, α, α'-azobis (isobutyronitrile)
0.15 parts was mixed in another container, and this mixed solution was added dropwise to the reaction container over 1 hour and 30 minutes.

During the dropwise addition of the mixed solution, 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H-
The benzotriazole powder was added into the reaction vessel in 10 portions every 10 minutes. During this time, the reaction solution was kept at 80 ° C.
And kept stirring. Thereafter, the reaction solution was kept at 80 ° C. for further 6 hours and 30 minutes to carry out the reaction with stirring, thereby completing the reaction.

To this, 55 parts of ethyl acetate, 73 parts of methyl ethyl ketone and 55 parts of toluene were added, and the solid content was adjusted to 30% to obtain ultraviolet absorbing acrylic resins A to O shown in Table 3. When the weight average molecular weights of these ultraviolet absorbing acrylic resins A to O were measured by GPC (in terms of polystyrene), they were in the range of 300,000 to 600,000.

In the table, BA is butyl acrylate,
BMA represents butyl methacrylate, 2-EHA represents 2-ethylhexyl acrylate, MMA represents methyl methacrylate, and VAc represents vinyl acetate. Resin H was prepared in Examples 1 to
It has the same monomer composition as the ultraviolet absorbing acrylic resin used in 4.

[0062]

[Table 3]

2. Production of Hard Coat Film The undercoat layer coating liquid having the following composition was prepared using the ultraviolet absorbing acrylic resins A to O, and these undercoat layer coating liquids were used in Example 1 A subbing layer was formed in the same manner as in Example 1 except that the undercoat layer was used instead of the layer coating solution.
A hard coat film was manufactured. About this undercoat layer and a hard coat film, similarly to Example 1,
The adhesiveness, scratch resistance and light resistance were evaluated. Table 3 shows the results.

<Coating liquid for undercoat layer> UV absorbing acrylic resin (solid content 30%) 72.0
Part ・ Polyester resin (Acryt ER20 <solid content 40%
>: Taisei Kakosha> 6.0 parts ・ Methyl ethyl ketone 18.6 parts ・ Cyclohexanone 43.4 parts

As is clear from the results in Table 3, even when the ratio between benzotriazole and (meth) acrylic acid ester was variously changed, the adhesion to the transparent polymer film and the ionizing radiation-curable resin layer were not changed. An undercoat layer having excellent adhesion to the undercoat, abrasion resistance and light resistance was obtained. When butyl acrylate, butyl methacrylate and 2-ethylhexyl acrylate were used as the (meth) acrylate, the adhesiveness to the ionizing radiation-curable resin layer was particularly excellent.

[0066]

According to the hard coat film of the present invention, an undercoat layer containing an ultraviolet absorbing resin and an ionizing radiation curable resin layer are laminated in this order on at least one surface of the transparent polymer film. Thus, a hard coat film having excellent light resistance can be obtained.

 ──────────────────────────────────────────────────の Continuing on the front page F term (reference) 4F006 AA02 AA12 AA15 AA17 AA22 AA35 AA36 AA38 AA39 AB24 BA02 BA03 CA08 DA04 EA03 4F100 AK01A AK01B AK01C AK25B JAKBABAC14B01B14C JL09 JN01A 4J100 AL03Q AL04Q AL08P BA03P BC43P BC75P CA01 CA04 DA61 DA65 JA43

Claims (5)

[Claims] 1. A hard coat film comprising an undercoat layer and an ionizing radiation curable resin layer laminated in this order on at least one surface of a transparent polymer film, wherein the undercoat layer contains an ultraviolet absorbing resin. A light-resistant hard coat film characterized by the following: 2. The light-resistant hard coat film according to claim 1, wherein the ultraviolet absorbing resin is an ultraviolet absorbing acrylic resin. 3. The ultraviolet-absorbing acrylic resin contains 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H- as a monomer component having an ultraviolet-absorbing group.
3. The light-resistant hard coat film according to claim 2, comprising benzotriazole. 4. A hard disk having light resistance according to claim 2, wherein said ultraviolet absorbing acrylic resin contains, as a monomer component, a (meth) acrylic ester having an alkyl group having 2 to 12 carbon atoms. Coat film. 5. The (meth) acrylic ester according to claim 1,
The light-resistant hard coat film according to claim 4, wherein one or more of butyl acrylate, butyl methacrylate, and 2-ethylhexyl acrylate are used.