Lightfastness-enhancing film

Abstract

To provide a film improved in light resistance capable of realizing excellent low reflectiveness and light resistance, and having excellent recoatability.SOLUTION: A film improved in light resistance includes: a substrate; and a light resistance-improved layer provided on one surface side of the substrate, where the diffuse reflectance of the light resistance-improved layer is 3% or lower as an average value of light of a wave length of 380 nm-780 nm, the water contact angle of a surface opposite side to the substrate of the light resistance-improved layer is lower than 80°, the light transmittance of the film improved in light resistance is 40% or lower as an average value of light of a wave length of 310 nm-380 nm, and the light resistance-improved layer contains a light stabilizer.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a light-resistant film that can be used in displays and the like, and more particularly to a light-resistant film that is suitable for use in displays and the like with an anti-reflective layer laminated on top. [Background technology]

[0002] In displays such as liquid crystal displays and organic EL displays, light incident on the display surface from the outside is reflected, making it difficult for the viewer to see the displayed content. From the viewpoint of reducing such reflection of external light, the display surface of the display is sometimes treated to prevent reflection. As one example, Patent Document 1 discloses providing an anti-reflective film having at least one low refractive index layer on a transparent support on the display surface of the display.

[0003] Furthermore, if the display surface of a display becomes scratched, the displayed content becomes difficult to see. In particular, such scratches usually remain permanently on the display surface, which diminishes the value of the display as a product. From the perspective of preventing such scratches, the display surface of a display is sometimes treated to prevent scratches. As one example, Patent Document 2 discloses that an optical laminate comprising a transparent substrate, a hard coat layer, an intermediate layer, and an anti-reflective layer in this order is provided on the display surface of a display. This optical laminate includes an anti-reflective layer in addition to the hard coat layer for scratch prevention, and is expected to have a certain effect on both scratch prevention and the aforementioned anti-reflective properties. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2010-152311 [Patent Document 2] Japanese Patent Publication No. 2017-161893 [Overview of the Initiative]

Problems to be Solved by the Invention

[0005] However, in a conventional optical laminate having a hard coat layer, such as the optical laminate disclosed in Patent Document 2, when exposed to external light for a long time, there are problems such as the hard coat layer peeling off from the substrate or the color tone changing. In particular, these problems are likely to occur when the optical laminate is used for in-vehicle displays or outdoor-installed displays that will be exposed to sunlight.

[0006] In addition, when applying a coating liquid that becomes a material for an antireflection layer onto the hard coat layer, there may be repelling of the coating liquid, and it may be difficult to form the antireflection layer well. In particular, the formation of the antireflection layer may be performed independently of the production of a hard coat film having a substrate and a hard coat layer. That is, a hard coat film having a substrate and a hard coat layer may be prepared in advance (or purchased from the outside), and a desired antireflection layer may be formed on the surface of the hard coat layer side in the hard coat film. In this case, compared with the case where the hard coat layer and the antireflection layer are formed in a series of processes, it becomes difficult to strictly control the conditions during production, etc., and the difficulty of forming the antireflection layer well increases.

[0007] Under such circumstances, there is a demand for a light resistance-improving film that can achieve low reflectivity capable of sufficiently reducing reflection, has light resistance such that layer peeling and color tone changes are unlikely to occur even when exposed to external light for a long time, and has good recoatability when laminating the material for the antireflection layer.

[0008] The present invention has been made in view of such a situation, and an object thereof is to provide a light resistance-improving film that can achieve excellent low reflectivity and light resistance, and has excellent recoatability.

Means for Solving the Problems

[0009] In order to achieve the above object, first, the present invention provides a light resistance improvement film including a base material and a light resistance improvement layer provided on one surface side of the base material, wherein the diffuse reflectance in the light resistance improvement layer is 3% or less as an average value for light having a wavelength of 380 nm to 780 nm, the water contact angle of the surface of the light resistance improvement layer opposite to the base material is less than 80°, the light transmittance in the light resistance improvement film is 40% or less as an average value for light having a wavelength of 310 nm to 380 nm, and the light resistance improvement layer contains a light stabilizer (Invention 1).

[0010] The light resistance improvement film according to the above invention (Invention 1) exhibits excellent light resistance by satisfying the above-described light transmittance and the light resistance improvement layer containing a light stabilizer. Further, by satisfying the above-described condition of the water contact angle, the material of the antireflection layer can be well coated on the surface on the light resistance improvement layer side (that is, excellent recoatability is exhibited), and the light resistance improvement film with an antireflection layer obtained thereby exhibits excellent low reflectivity by satisfying the above-described diffuse reflectance.

[0011] In the above invention (Invention 1), it is preferable that the light stabilizer is a hindered amine light stabilizer (Invention 2).

[0012] In the above invention (Inventions 1 and 2), the absolute value of the difference between the chromaticity a defined by the CIE1976L * , * a * b * color system of the light resistance improvement film and the chromaticity a after performing a 400-hour light resistance test using an ultraviolet carbon arc lamp type in accordance with JIS B7751:2007 on the light resistance improvement film is preferably 0 or more and 3 or less (Invention 3).

[0013] In the above invention (Inventions 1 to​​​​​​​​​Chromaticity b defined by the color system * and the chromaticity b after conducting an ultraviolet carbon arc lamp type light resistance test in accordance with JIS B7751:2007 for 400 hours on the light resistance improving film * It is preferable that the absolute value of the difference therebetween is 0 or more and 3 or less (Invention 4).

[0014] In the above inventions (Inventions 1 to 4), it is preferable that the side opposite to the base material in the light resistance improving layer is the surface on which the antireflection layer is laminated (Invention 5).

[0015] In the above inventions (Inventions 1 to 5), it is preferably used as a member constituting the display body (Invention 6).

[0016] In the above invention (Invention 6), it is preferable that the display body is a display body for in-vehicle use or a display body for outdoor installation (Invention 7).

Effects of the Invention

[0017] The light resistance improving film according to the present invention can achieve excellent low reflectivity and light resistance, and has excellent recoatability.

Modes for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described. The light resistance improving film according to the present embodiment includes a base material and a light resistance improving layer provided on one surface side of the base material.

[0019] And, the diffuse reflectance in the above light resistance improving layer is preferably 3% or less as an average value for light having a wavelength of 380 nm to 780 nm. Further, the water contact angle of the surface opposite to the base material in the above light resistance improving layer is preferably less than 80°. Further, the light transmittance in the above light resistance improving film is preferably 40% or less as an average value for light having a wavelength of 310 nm to 380 nm. Furthermore, it is preferable that the above light resistance improving layer contains a light stabilizer.

[0020] The light-resistant film according to this embodiment satisfies the above-mentioned diffuse reflectance, and the light-resistant film with an anti-reflective layer, obtained by forming an anti-reflective layer on the surface of the light-resistant layer, exhibits excellent low reflectivity. Furthermore, in a display body in which this light-resistant film with an anti-reflective layer is laminated on a display surface, a highly visible display with suppressed reflections becomes possible.

[0021] Furthermore, the light-resistant film according to this embodiment satisfies the above-mentioned water contact angle conditions, so when the anti-reflective layer material (particularly the coating liquid of the composition for forming the anti-reflective layer) is applied to the surface of the light-resistant layer, the occurrence of repelling of the material is suppressed, and it exhibits excellent recoatability. As a result, the occurrence of defects in the formed coating film is suppressed, and it becomes possible to form a good anti-reflective layer.

[0022] Furthermore, the lightfastness-enhancing film according to this embodiment satisfies the above-mentioned light transmittance requirements, and because the lightfastness-enhancing layer contains a light stabilizer, the adhesion between the lightfastness-enhancing layer and the substrate, as well as the adhesion between the lightfastness-enhancing layer and the anti-reflective layer laminated thereon, is improved. As a result, even when exposed to light for a long period of time, peeling of the layers constituting the lightfastness-enhancing film is suppressed, and changes in the color of the lightfastness-enhancing layer are less likely to occur. In other words, the lightfastness-enhancing film according to this embodiment has excellent lightfastness.

[0023] 1. Physical properties of light-resistant film (1) Diffuse reflectance In the light-resistant film according to this embodiment, as described above, the diffuse reflectance in the light-resistant layer is preferably 3% or less as an average value for light with wavelengths of 380 nm to 780 nm. By satisfying the diffuse reflectance condition, the light-resistant film according to this embodiment has excellent low reflectivity. From this viewpoint, the diffuse reflectance is preferably 2.5% or less, more preferably 2% or less, particularly preferably 1.6% or less, and even more preferably 1.4% or less. The lower limit of the diffuse reflectance is usually 0% or more, may be 0.1% or more, may be particularly preferably 0.5% or more, and may even be 0.8% or more. Details of the method for measuring the diffuse reflectance are shown in the test examples described later.

[0024] (2) Water contact angle In the light-resistant film according to this embodiment, as described above, it is preferable that the water contact angle of the light-resistant layer on the side opposite to the substrate is less than 80°. This allows the side of the light-resistant film facing the light-resistant layer to exhibit excellent recoatability. From this viewpoint, the water contact angle is preferably 76° or less, particularly preferably 72° or less, and even more preferably 70° or less. The lower limit of the water contact angle is usually 0° or more, may be 20° or more, particularly 40° or more, and even more preferably 60° or more. Details of the method for measuring the water contact angle are shown in the test examples described later.

[0025] (3) Light transmittance In the light-resistant film according to this embodiment, as described above, the light transmittance is preferably 40% or less as an average value for light with wavelengths of 310 nm to 380 nm (light in the near-ultraviolet region). The light-resistant film according to this embodiment satisfies the above light transmittance condition and, because the light-resistant layer contains a light stabilizer, it has excellent light resistance. From this viewpoint, the above light transmittance is preferably 35% or less, particularly preferably 30% or less, and even more preferably 25% or more. The lower limit of the above light transmittance is usually 0% or more, may be 1% or more, may be particularly 5% or more, and may even be 10% or more.

[0026] Furthermore, in the light-resistant film according to this embodiment, the light transmittance obtained as an average value for light with wavelengths of 380 nm to 420 nm (ultraviolet light) is preferably 98 to 30%, more preferably 95 to 50%, particularly preferably 92 to 70%, and even more preferably 90 to 80%. When the light transmittance for light with wavelengths of 380 nm to 420 nm is within the above range, it becomes easier to satisfy the above range for light transmittance for wavelengths of 310 nm to 380 nm.

[0027] Further details regarding the measurement method for light transmittance are shown in the test examples described later.

[0028] (4) Change in chromaticity In the light-resistant film according to this embodiment, CIE1976L * a * b * Chromaticity a defined by the color system * (Hereinafter, chromaticity a * The term "initial value" is sometimes used. The chromaticity a is preferably -10 to 10, more preferably -5 to 5, particularly preferably -2 to 2, even more preferably -1 to 1, and most preferably -0.5 to 0.5. *By having the initial value within the above range, the display content in a display body using the light-resistant film according to this embodiment becomes more easily visible to the viewer with appropriate colors.

[0029] Furthermore, when a lightfastness test using an ultraviolet carbon arc lamp in accordance with JIS B7751:2007 was performed on the lightfastness-enhancing film according to this embodiment for 400 hours, the chromaticity a of the lightfastness-enhancing film after the lightfastness test was... * And the chromaticity a mentioned above * The absolute value of the difference from the initial value is preferably 3 or less, more preferably 2 or less, particularly preferably 1 or less, even more preferably 0.5 or less, and most preferably 0.1 or less. As described above, the lightfastness-improving film according to this embodiment exhibits excellent lightfastness, so the chromaticity a before and after the lightfastness test is * This makes it easier to keep the absolute value of the difference within the above range. And, because the absolute value of the difference is within the above range, even when the display body using the light-resistant film according to this embodiment is exposed to light for a long period of time, changes in color will be suppressed and appropriate display content will be displayed for a long period of time. The lower limit of the absolute value of the difference is usually 0 or more, in particular it may be 0.001 or more, and moreover it may be 0.01 or more.

[0030] Furthermore, the light-resistant film according to this embodiment uses CIE1976L * a * b * Chromaticity b as defined by the color system * (Hereafter, chromaticity b * The term "initial value" is sometimes used. It is preferably -10 to 10, more preferably -5 to 5, particularly preferably -2 to 2, and even more preferably -1 to 1. Chromaticity b * By having the initial value within the above range, the display content in a display body using the light-resistant film according to this embodiment becomes more easily visible to the viewer with appropriate colors.

[0031] Furthermore, when a lightfastness test using an ultraviolet carbon arc lamp in accordance with JIS B7751:2007 was performed on the lightfastness-enhancing film according to this embodiment for 400 hours, the chromaticity b of the lightfastness-enhancing film after the lightfastness test was... * And the chromaticity b mentioned above. * The absolute value of the difference from the initial value is preferably 3 or less, preferably 2 or less, particularly preferably 1 or less, even more preferably 0.5 or less, and most preferably 0.1 or less. As described above, the lightfastness-improving film according to this embodiment exhibits excellent lightfastness, so the chromaticity b before and after the lightfastness test is * This makes it easier to keep the absolute value of the difference within the above range. And, because the absolute value of the difference is within the above range, even when the display body using the light-resistant film according to this embodiment is exposed to light for a long period of time, changes in color will be suppressed and appropriate display content will be displayed for a long period of time. The lower limit of the absolute value of the difference is usually 0 or more, may be 0.001 or more, may be particularly 0.01 or more, and may even be 0.05 or more.

[0032] Further details regarding the measurement of chromaticity and the lightfastness test described above are as shown in the test examples below.

[0033] (5) Haze value In the light-resistant film according to this embodiment, the haze value is preferably 40% or less, and particularly preferably 30% or less, from the viewpoint of easily ensuring sufficient transparency. From the viewpoint of easily suppressing the occurrence of scattering of image light and the phenomenon of that part becoming glaring (hereinafter sometimes referred to as "glare"), the haze value is preferably 25% or less, and even more preferably 20% or less. Furthermore, in the display body using the light-resistant film according to this embodiment, the haze value is preferably 1% or more from the viewpoint of suppressing glare, and from the viewpoint of providing anti-glare properties, it is preferably 2% or more, particularly preferably 4% or more, even more preferably 5% or more, and most preferably 5.5% or more. The above haze values ​​were measured in accordance with JIS K7136:2000, and the detailed measurement method is as described in the test examples below.

[0034] (6) Total light transmittance In the light-resistant film according to this embodiment, the total light transmittance is preferably 80% or higher, more preferably 85% or higher, particularly preferably 88% or higher, and even more preferably 91% or higher, from the viewpoint of easily ensuring sufficient transparency. On the other hand, the upper limit of the total light transmittance is usually 100% or less, may be 99% or less, may be particularly 98% or less, and may even be 95% or less. The total light transmittance was measured in accordance with JIS K7361-1:1997, and the detailed measurement method is as described in the test examples below.

[0035] (7) Transparency In the light-resistant film according to this embodiment, the transmission clarity (image clarity) is preferably 250% or more and 500% or less when expressed as the sum of the transmission clarity values ​​using optical combs with comb widths of 0.125 mm, 0.25 mm, 0.5 mm, 1.0 mm, and 2.0 mm. This makes it easier to clearly see the displayed content in a display body using the light-resistant film according to this embodiment. In particular, from the viewpoint of suppressing glare, it is preferably 280% or more, and further, considering the viewpoint that the aforementioned diffuse reflectance value tends to fall within the desired range, it is more preferably 300% or more, especially preferably 350% or more, even more preferably 380% or more, and among these, 400% or more is preferred, and 440% or more is most preferred. Furthermore, the above transmission clarity is preferably 495% or less, and from the viewpoint of providing anti-glare properties, it is preferably 485% or less, especially preferably 480% or less, and even more preferably 475% or less. Further details regarding the measurement method for the above-mentioned transmission clarity are as described in the test examples below.

[0036] (8) 60° Gloss In the lightfastness-enhancing film according to this embodiment, the 60° gloss measured on the surface of the lightfastness-enhancing layer is preferably 30% or more from the viewpoint of suppressing glare, more preferably 40% or more, particularly preferably 50% or more, even more preferably 60% or more, and most preferably 80% or more, from the viewpoint of making it easier for the aforementioned diffuse reflectance to fall within the desired range. Furthermore, the above 60° gloss is preferably 160% or less, more preferably 158% or less, and from the viewpoint of making it easier to exhibit the desired anti-glare properties, it is preferably 150% or less, particularly preferably 135% or less, and even more preferably 125% or less. The above 60° gloss was measured in accordance with JIS Z8741:1997, and the detailed measurement method is as described in the test examples below.

[0037] (9)Pencil hardness In the light-resistant film according to this embodiment, the scratch hardness (pencil hardness) of the surface on the light-resistant layer side, measured by the pencil method in accordance with JIS K5600-5-4:1999, is preferably H or higher, particularly preferably 2H or higher, and even more preferably 3H or higher. On the other hand, the pencil hardness is preferably 9H or lower, more preferably 8H or lower, particularly preferably 7H or lower, even more preferably 6H or lower, and among these, preferably 5H or lower, and most preferably 4H or lower. By having such a pencil hardness, the light-resistant film according to this embodiment can easily exhibit the desired hardness and scratch resistance, and when used on the surface of a display object, it exhibits excellent surface protection, and in particular the surface becomes less susceptible to scratches, making it easier to maintain the aesthetic appearance of the display object. The detailed measurement method for the above pencil hardness is as described in the test examples below.

[0038] (10) Scratch resistance In the light-resistant film according to this embodiment, the surface on the light-resistant layer side is treated with 250 g / cm² of #0000 steel wool in accordance with JIS K5600-5-10. 2 It is preferable that no scratches appear on the surface after rubbing it 10 times back and forth over a 10cm length with the specified load. This provides excellent surface protection when used on the surface of a display object, and in particular, the surface is resistant to scratches, thus maintaining the aesthetic appearance of the display object well. The detailed test method for the scratch resistance is as described in the test examples below.

[0039] (11) Adhesion After conducting a 400-hour lightfastness test on the lightfastness-enhancing film according to this embodiment using an ultraviolet carbon arc lamp in accordance with JIS B7751:2007, 100 grid squares of 1 mm x 1 mm were formed on the lightfastness-enhancing layer using a cutter knife in accordance with JIS K5600-5-6. Then, under conditions of 23°C and 50% RH, adhesive tape was applied to the grid squares using a squeegee for 30 seconds, and the adhesive tape was peeled off in a 90° direction. Preferably, the number of grid squares remaining on the substrate without separation of the lightfastness-enhancing layer is 90 or more, more preferably 95 or more, even more preferably 99 or more, and most preferably 100. By satisfying the above number, the resulting lightfastness-enhancing film exhibits excellent interlayer adhesion and is particularly superior in lightfastness. The detailed test method for the above adhesion is described in the test examples below.

[0040] (12) Total reflectance In the light-resistant film according to this embodiment, if the total reflectance (%) of the surface on the side with the light-resistant layer before the formation of the anti-reflective layer is less than 2%, the above-mentioned diffuse reflectance is easily satisfied, and excellent low reflectivity is easily exhibited even after the formation of the anti-reflective layer. In this case, the total reflectance (%) of the surface on the side with the light-resistant layer after the formation of the anti-reflective layer is preferably 1.5% or less, particularly preferably 1.2% or less, and even more preferably 1.0% or less. The lower limit of this total reflectance (%) is usually 0% or more. This results in particularly excellent low reflectivity.

[0041] On the other hand, from the viewpoint of easily exhibiting excellent low reflectivity even after the formation of the anti-reflective layer, if the total reflectance (%) of the surface on the light-resistant layer side before the formation of the anti-reflective layer is 2% or more, it is preferable that the difference in total reflectance obtained by subtracting the total reflectance (%) of the surface on the light-resistant layer side after the formation of the anti-reflective layer from the total reflectance (%) of the surface on the light-resistant layer side before the formation of the anti-reflective layer is 1.5 points or more, particularly preferably 2.0 points or more, and even more preferably 2.5 points or more. This makes it easier to satisfy the diffuse reflectance described above, and when an anti-reflective layer is formed on the light-resistant film according to this embodiment, good anti-reflective properties are exhibited. The upper limit of the above difference in total reflectance is not particularly limited, and may be, for example, 10 points or less, particularly 6 points or less, and even 4 points or less. The detailed test method for the above total reflectance is as described in the test examples below.

[0042] 2. Each component constituting the light-resistant film (1) Base material The substrate constituting the light-resistant film according to this embodiment is not particularly limited, but it is preferable to use a resin film having a predetermined transparency. Examples of such resin films include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyolefin films such as polyethylene films and polypropylene films; cellophane; diacetylcellulose films; triacetylcellulose films; acetylcellulose butyrate films; polyvinyl chloride films; polyvinylidene chloride films; polyvinyl alcohol films; ethylene-vinyl acetate copolymer films; polystyrene films; polycarbonate films; polymethylpentene films; polysulfone films; polyetheretherketone films; polyethersulfone films; polyetherimide films; fluororesin films; polyamide films; acrylic resin films; polyurethane resin films; norbornene-based polymer films; cyclic olefin-based polymer films; cyclic conjugated diene-based polymer films; vinyl alicyclic hydrocarbon polymer films; and other resin films or laminated films thereof. Among these, polyethylene terephthalate film, polycarbonate film, triacetylcellulose film, norbornene polymer film, etc. are preferred in terms of mechanical strength and other factors, and triacetylcellulose film is particularly preferred from the viewpoint of adhesion with the light-resistant layer.

[0043] Furthermore, the above-mentioned substrate may be surface-treated on one or both sides, if desired, by priming, oxidation, or embossing, in order to improve adhesion with the layer provided on its surface (especially the lightfastness-improving layer). Examples of oxidation methods include corona discharge treatment, chromic acid treatment, flame treatment, hot air treatment, and ozone / ultraviolet treatment, while examples of embossing methods include sandblasting and solvent treatment. These surface treatment methods are appropriately selected depending on the type of substrate, but generally, corona discharge treatment is preferred due to its effectiveness in improving adhesion and ease of handling.

[0044] From the viewpoint of ease of handling, the thickness of the substrate is preferably 10 μm or more, more preferably 20 μm or more. From the viewpoint of surface protection when applied to a display and mitigating the impact on the display when impact is applied, it is preferably 40 μm or more, particularly preferably 60 μm or more, and even more preferably 75 μm or more. Furthermore, the thickness of the substrate is preferably 250 μm or less, more preferably 225 μm or less. From the viewpoint of thinning and making it easier to satisfy the aforementioned optical properties, it is preferably 200 μm or less, of which 150 μm or less is preferred, even more preferably 110 μm or less, and most preferably 90 μm or less.

[0045] (2) Light resistance improving layer The light-resistant layer constituting the light-resistant film according to this embodiment may be formed from any material, as long as it contains a light stabilizer and enables the achievement of the aforementioned diffuse reflectance, water contact angle, and light transmittance for wavelengths of 310 nm to 380 nm.

[0046] A suitable material for the light-resistant layer is a coating composition containing a curable component (A), an ultraviolet absorber (B), a light stabilizer (C), a leveling agent (D), and a filler (E). Preferably, the light-resistant layer is formed by curing the coating composition.

[0047] (2-1) Curable component (A) The curable component (A) is a component that hardens in response to triggers such as active energy rays or heat, and examples include active energy ray curable components and thermosetting components. In the light-resistant layer of this embodiment, it is preferable to use an active energy ray curable component from the viewpoint of the hardness of the formed light-resistant layer and the heat resistance of the substrate.

[0048] As the active energy ray curable component, it is preferable to use one that hardens upon irradiation with active energy rays, exhibits a predetermined hardness, and achieves the aforementioned physical properties.

[0049] Specific examples of active energy ray curable components include polyfunctional (meth)acrylate monomers, (meth)acrylate prepolymers, and active energy ray curable polymers. Among these, polyfunctional (meth)acrylate monomers and / or (meth)acrylate prepolymers are preferred, and polyfunctional (meth)acrylate monomers are more preferred. Polyfunctional (meth)acrylate monomers and (meth)acrylate prepolymers may be used individually or in combination. In this specification, (meth)acrylate refers to both acrylate and methacrylate. The same applies to other similar terms.

[0050] Examples of polyfunctional (meth)acrylate monomers include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, hydroxypivalate neopentyl glycol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphate di(meth)acrylate, allylated cyclohexyl di(meth)acrylate, isocyanurate di(meth)acrylate, trimethylolpropane tri(meth)acrylate, and dipentaerythryl Examples of polyfunctional (meth)acrylates include thritol tri(meth)acrylate, propionic acid-modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide-modified trimethylolpropane tri(meth)acrylate, tris(acryloxyethyl) isocyanurate, pentaerythritol tetra(meth)acrylate, propionic acid-modified dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, ethylene oxide-modified dipentaerythritol hexa(meth)acrylate, and caprolactone-modified dipentaerythritol hexa(meth)acrylate. These may be used individually or in combination of two or more.

[0051] On the other hand, examples of (meth)acrylate-based prepolymers include polyester acrylate-based, epoxy acrylate-based, urethane acrylate-based, and polyol acrylate-based prepolymers.

[0052] Polyester acrylate prepolymers can be obtained, for example, by esterifying the hydroxyl groups of a polyester oligomer having hydroxyl groups at both ends, obtained by condensation of a polycarboxylic acid and a polyhydric alcohol, with (meth)acrylic acid, or by esterifying the terminal hydroxyl groups of an oligomer obtained by adding an alkylene oxide to a polycarboxylic acid with (meth)acrylic acid.

[0053] Epoxyacrylate prepolymers can be obtained, for example, by reacting (meth)acrylic acid with the oxirane ring of a relatively low molecular weight bisphenol-type epoxy resin or novolac-type epoxy resin to esterify it.

[0054] Urethane acrylate-based prepolymers can be obtained, for example, by esterifying polyurethane oligomers, which are obtained by the reaction of polyether polyols or polyester polyols with polyisocyanates, with (meth)acrylic acid.

[0055] Polyol acrylate-based prepolymers can be obtained, for example, by esterifying the hydroxyl groups of a polyether polyol with (meth)acrylic acid.

[0056] The above prepolymers may be used individually or in combination of two or more.

[0057] Furthermore, it is also preferable to use an organic-inorganic hybrid resin as the active energy ray curable component. Preferred organic-inorganic hybrid resins include substances formed by bonding an organic compound having polymerizable unsaturated groups to inorganic fine particles such as silica via a silane coupling agent. Note that the inorganic fine particles contained in the organic-inorganic hybrid resin are not the fine particles and nanoparticles described later, but rather function as a binder, which can improve the hardness of the resulting light-resistant layer.

[0058] (2-2) UV absorber (B) It is preferable to include the ultraviolet absorber (B) in the coating composition because it facilitates achieving the aforementioned physical properties related to light transmittance in the wavelength range of 310 nm to 380 nm.

[0059] Examples of ultraviolet absorbers (B) are not particularly limited and include triazine compounds, benzophenone compounds, benzotriazole compounds, benzoate compounds, benzoxazinon compounds, phenyl salicylate compounds, cyanoacrylate compounds, nickel complex salt compounds, etc. These may be used individually or in combination of two or more. Among the above, triazine compounds, benzophenone compounds, or benzotriazole compounds are preferred, and triazine compounds are particularly preferred.

[0060] Examples of the above triazine compounds include 2,4-bis[2-hydroxy-4-butoxyphenyl]-6-(2,4-dibutoxyphenyl)-1,3-5-triazine and 2-[4,6-di(2,4-xylyl)-1,3,5-triazine-2-yl]-5-octyloxyphenol.

[0061] Examples of the above-mentioned benzophenone compounds include 2,2-dihydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid hydrate, and 2-hydroxy-4-n-octyloxybenzophenone.

[0062] Examples of the above-mentioned benzotriazole compounds include 2-(2-hydroxy-5-t-butylphenyl)-2H-benzotriazole, octyl-3-[3-t-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazole-2-yl)phenyl]propionate, and 2-ethylhexyl-3-[3-t-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazole-2-yl)phenyl]propionate.

[0063] The amount of ultraviolet absorber (B) in the coating composition is preferably 0.1 parts by mass or more, more preferably 1 part by mass or more, particularly preferably 2 parts by mass or more, and even more preferably 3 parts by mass or more, per 100 parts by mass of curable component (A), from the viewpoint of easily achieving the aforementioned physical properties related to light transmittance, change in chromaticity, and adhesion for wavelengths of 310 nm to 380 nm. Furthermore, the amount of ultraviolet absorber (B) is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, particularly preferably 6 parts by mass or less, and even more preferably 4 parts by mass or less, per 100 parts by mass of curable component (A). This improves the coatability of the coating composition, makes it easier to form a lightfastness-improving layer with a uniform film thickness, and tends to make it easier to satisfy the desired range of water contact angle.

[0064] (2-3) Light stabilizer (C) As described above, the lightfastness-enhancing layer in this embodiment contains a light stabilizer (C). Therefore, it is preferable to include a light stabilizer (C) in the coating composition for forming the lightfastness-enhancing layer. This makes it easier for the lightfastness-enhancing film according to this embodiment to achieve physical properties related to color change and adhesion, and to have excellent lightfastness.

[0065] Examples of light stabilizers (C) are not limited to hindered amine light stabilizers, benzophenone light stabilizers, benzotriazole light stabilizers, etc. These light stabilizers (C) may be used alone or in combination of two or more.

[0066] Among the examples of light stabilizers (C) described above, it is preferable to use a hindered amine-based light stabilizer from the viewpoint of easily achieving excellent light resistance. Here, a hindered amine refers to an amine having substituents on both sides of the amino group. The hindered amine-based light stabilizer in this embodiment is given by the following general formula (I) [ka] (In the formula, R1 represents a hydrogen atom or an alkyl group.) It is preferable that the compound contains at least one skeleton consisting of the following.

[0067] In this embodiment, the hindered amine-based light stabilizer is R in the above general formula (I). 1 However, it is preferable that the alkyl group is alkyl with 1 to 4 carbon atoms, and more preferably that it is a methyl group. In other words, the hindered amine compound in this embodiment is preferably having an N-alkyl skeleton, particularly preferably having an N-C1 to C4 alkyl skeleton, and more preferably having an N-CH3 skeleton.

[0068] The hindered amine light stabilizer in this embodiment preferably has one or more skeletons consisting of the above general formula (I), more preferably 1 to 10, particularly preferably 1 to 7, even more preferably 1 to 4, and most preferably 1 to 2. The skeleton consisting of the above general formula (I) may be present at the end of the hindered amine light stabilizer, at the side chain, or at both the end and the side chain. If the hindered amine light stabilizer has one or two skeletons consisting of the above general formula (I), it is preferable that they be present at the side chain.

[0069] Furthermore, if the hindered amine-based light stabilizer has two or more skeletons consisting of the above general formula (I), each R 1 They may be the same or they may be different.

[0070] In this embodiment, the hindered amine-based light stabilizer is preferably a compound in which an oxygen atom of the -COO- skeleton is bonded to the carbon atom at position 4 of the skeleton consisting of the above general formula (I).

[0071] The hindered amine-based light stabilizer in this embodiment is defined by the following structural formula (A): [ka] (In the formula, n is an integer greater than or equal to 1.) The compound shown by, or the following structural formula (B) [ka] (In the formula, m is an integer greater than or equal to 1.) It is particularly preferable that the compound is one represented by [the formula shown].

[0072] In the compound represented by the above structural formula (A), n is preferably 1 to 20, particularly preferably 3 to 15, and even more preferably 5 to 10.

[0073] In the compound represented by the above structural formula (B), m is preferably 1 to 20, particularly preferably 3 to 15, and even more preferably 5 to 10. In the above formula, R 2 It is preferably an alkyl group, particularly preferably an alkyl group having 1 to 4 carbon atoms, and even more preferably a methyl group.

[0074] The compound represented by structural formula (A) and the compound represented by structural formula (B) can each be used individually, but it is preferable to use them in combination.

[0075] The content of the light stabilizer (C) in the coating composition is preferably 0.1 parts by mass or more, preferably 1 part by mass or more, particularly preferably 2 parts by mass or more, and more preferably 2.5 parts by mass or more, per 100 parts by mass of the curable component (A). This makes it easier for the light-resistant film according to this embodiment to achieve physical properties related to color change and adhesion, and to have excellent light resistance. Furthermore, the content of the light stabilizer (C) is preferably 10 parts by mass or less, preferably 7 parts by mass or less, particularly preferably 5 parts by mass or less, and more preferably 3 parts by mass or less, per 100 parts by mass of the curable component (A). This improves the coatability of the coating composition, makes it easier to form a light-resistant layer with a uniform film thickness, and tends to make it easier for the aforementioned water contact angle to be within the desired range.

[0076] (2-4) Leveling agent (D) From the viewpoint of easily forming a light-resistant layer with a uniform film thickness and free from streaky defects or unevenness, the coating composition preferably contains a leveling agent (D).

[0077] Examples of leveling agents (D) are not particularly limited and include fluorine-based leveling agents, silicone-based leveling agents, acrylic-based leveling agents, vinyl-based leveling agents, etc. Among these, fluorine-based leveling agents are preferred from the viewpoint of easily satisfying the aforementioned water contact angle properties. Leveling agents (D) may be used individually or in combination of two or more types.

[0078] As a fluorine-based leveling agent, it is preferable that the compound has a perfluoroalkyl group or a fluorinated alkenyl group in its main chain or side chain. Examples of commercially available fluorine-based leveling agents include "Futergent 602A" and "Futergent 650A" from Neos Corporation, "BYK-340" from Big Chemie Japan, "Megafac RS-75" from DIC Corporation, and "V-8FM" from Osaka Organic Chemical Industry Co., Ltd.

[0079] The content of the leveling agent (D) in the coating composition is preferably 0.001 to 1 part by mass or more, more preferably 0.01 to 0.2 parts by mass or more, particularly preferably 0.02 to 0.1 parts by mass or more, and even more preferably 0.04 to 0.07 parts by mass or more, per 100 parts by mass of the curable component (A). Having the leveling agent (D) content within the above range makes it easier to form a light-resistant layer with a uniform film thickness and satisfying the aforementioned water contact angle properties.

[0080] (2-5) Filler (E) From the viewpoint of forming desired irregularities on the surface of the light-resistant layer opposite to the substrate, thereby easily providing good anti-glare properties, it is also preferable for the coating composition to contain filler (E).

[0081] Filler (E) may be an organic filler, an inorganic filler, or a resin filler that combines the properties of both inorganic and organic materials. From the viewpoint of easily exhibiting good dispersibility, coating stability, desired optical properties, and good appearance, an organic filler or a resin filler that combines the properties of both inorganic and organic materials is preferred as filler (E). From the viewpoint of easily adjusting the aforementioned diffuse reflectance and optical properties to a desired range, a resin filler that combines the properties of both inorganic and organic materials is preferred.

[0082] Examples of organic fillers include acrylic resin fillers (e.g., polymethyl methacrylate fillers), silicone fillers, melamine resin fillers, acrylic-styrene copolymer fillers, polycarbonate fillers, polyethylene fillers, polystyrene fillers, and benzoguanamine resin fillers. These resins may be crosslinked. Among the above, acrylic resin fillers and silicone fillers are preferred. In particular, polymethyl methacrylate fillers are preferred as acrylic resin fillers, and crosslinked polymethyl methacrylate fillers are even more preferred.

[0083] Examples of inorganic fillers include those made of silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide.

[0084] As a resin filler that combines inorganic and organic properties, silicone fillers (for example, the Tospar series manufactured by Momentive Performance Materials Japan) are particularly preferred.

[0085] Furthermore, the above fillers (E) may be used individually or in combination of two or more types.

[0086] The filler (E) described above may have undergone a desired surface modification. The shape of the filler may be fixed, such as spherical, or it may be amorphous, but it is preferable that it be fixed, and particularly preferable that it be spherical.

[0087] The average particle size of filler (E) is preferably 0.5 to 20 μm, more preferably 1 to 10 μm, particularly preferably 2 to 7 μm, even more preferably 3 to 5 μm, and most preferably 4 to 4.5 μm. Having the average particle size of filler (E) within the above range makes it easier to form the desired irregularities on the surface of the lightfastness-improving layer opposite to the substrate, thus easily satisfying the aforementioned optical properties such as haze value, total light transmittance, and 60° gloss. The average particle size of filler (E) is determined by measuring the primary particle size using laser diffraction.

[0088] The refractive index of the filler (E) is preferably 1.2 to 1.6, more preferably 1.3 to 1.55, particularly preferably 1.4 to 1.5, and even more preferably 1.42 to 1.45. This makes it easier for the resulting lightfastness-improving film to satisfy the aforementioned optical properties.

[0089] The content of filler (E) in the coating composition is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, and even more preferably 1 part by mass or more, per 100 parts by mass of curable component (A). This makes it easier to form the desired irregularities on the surface of the lightfastness-improving layer opposite to the substrate, making it easier to satisfy the optical properties such as the haze value, total light transmittance, and 60° gloss mentioned above, and tends to easily exhibit the desired anti-glare and glare suppression effects. Furthermore, the content of filler (E) is preferably 20 parts by mass or less, more preferably 15 parts by mass or less, per 100 parts by mass of curable component (A), and from the viewpoint of suppressing glare and from the viewpoint of making it easier for the diffuse reflectance mentioned above to be within the desired range, it is preferably 12 parts by mass or less, more preferably 8 parts by mass or less, particularly preferably 4 parts by mass or less, and even more preferably 2 parts by mass or less. This makes it easier to form the desired irregularities on the side of the light-resistant layer opposite to the substrate, thereby exhibiting the desired anti-glare properties while suppressing glare and providing low reflectivity.

[0090] (2-6) Other ingredients The coating composition in this embodiment may contain various additives in addition to the components listed above. Examples of such additives include dispersants, surface modifiers, photopolymerization initiators, antioxidants, antistatic agents, silane coupling agents, anti-aging agents, thermal polymerization inhibitors, colorants, surfactants, preservatives, plasticizers, lubricants, defoamers, organic fillers, wettability modifiers, and coating surface modifiers.

[0091] In particular, from the viewpoint of improving the dispersibility of the aforementioned components, it is preferable that the coating composition contains a dispersant. As a dispersant, for example, a compound having one or more polar groups selected from the group consisting of carboxyl groups, hydroxyl groups, sulfo groups, primary amino groups, secondary amino groups, tertiary amino groups, amide groups, quaternary ammonium bases, pyridium bases, sulfonium bases, and phosphonium bases in the molecule is preferred, and a compound having one or more polar groups of carboxyl groups and hydroxyl groups is particularly preferred. The above polar groups may be introduced one at a time or multiple at a time in the molecule. When a compound as a dispersant has multiple polar groups, the basic skeleton of the compound is preferably composed of an ester chain, vinyl chain, acrylic chain, ether chain, urethane chain, etc. Specifically, acrylic resins, urethane resins, polyester resins, and alkyd resins are preferred, acrylic resins, urethane resins, and polyester resins are particularly preferred, and acrylic resins are even more preferred. The above polar groups may be randomly arranged in the molecule, but it is preferable that they be arranged in the side chains. Therefore, the compound used as a dispersant is preferably an acrylic resin having a carboxyl group and / or a hydroxyl group in its side chain. The dispersant may be used alone or in combination of two or more types.

[0092] The amount of dispersant in the coating composition is preferably 0.01 to 2 parts by mass or more, more preferably 0.05 to 1 part by mass or more, particularly preferably 0.1 to 0.5 parts by mass or more, and even more preferably 0.2 to 0.3 parts by mass or more, per 100 parts by mass of curable component (A). Having a dispersant content within the above range facilitates good dispersion of the components in the coating composition, and the resulting lightfastness-enhancing layer readily satisfies the aforementioned diffuse reflectance, water contact angle, and optical properties.

[0093] (2-7) Thickness of the lightfastness-improving layer The thickness of the lightfastness-enhancing layer is preferably 1 μm or more, more preferably 1.5 μm or more, particularly preferably 2 μm or more, even more preferably 3 μm or more, and most preferably 4 μm or more, from the viewpoint of easily exhibiting the desired hardness and scratch resistance. Furthermore, the thickness of the lightfastness-enhancing layer is preferably 30 μm or less, more preferably 20 μm or less, from the viewpoint of ease of handling, such as making the lightfastness-enhancing layer less prone to cracking. From the viewpoint of suppressing peeling of the layers constituting the lightfastness-enhancing film and making it less likely for the color of the lightfastness-enhancing layer to change even when exposed to light for a long period of time, it is preferably 10 μm or less, particularly preferably 7 μm or less, and even more preferably 5 μm or less.

[0094] (3) Other components The lightfastness-enhancing film according to this embodiment may include layers other than the substrate and the lightfastness-enhancing layer. For example, an anti-reflective layer may be provided on the side of the lightfastness-enhancing layer opposite to the substrate. As described above, the lightfastness-enhancing film according to this embodiment exhibits excellent recoatability, so it is preferable to laminate an anti-reflective layer on the side of the lightfastness-enhancing layer opposite to the substrate. In other words, in the lightfastness-enhancing film according to this embodiment, it is preferable that the side of the lightfastness-enhancing layer opposite to the substrate is the side on which the anti-reflective layer is laminated. Because the lightfastness-enhancing film according to this embodiment includes an anti-reflective layer, the display object on which the lightfastness-enhancing film is used will have excellent low reflectivity.

[0095] As the anti-reflective layer, any desired anti-reflective layer from among those conventionally known can be used. In particular, even when a coating liquid is used as the material for forming the anti-reflective layer, the light-resistant film according to this embodiment can suppress the occurrence of repelling when the light-resistant layer is applied to the side opposite to the substrate, and can form the desired anti-reflective layer.

[0096] Furthermore, the light-resistant film according to this embodiment may have an adhesive layer on the side of the substrate opposite to the light-resistant layer. In particular, when the light-resistant film according to this embodiment is laminated onto the display surface of a completed display, the presence of an adhesive layer makes it easier for the light-resistant film to adhere well to the display surface.

[0097] The adhesive constituting the above adhesive layer is not particularly limited, and known adhesives such as acrylic adhesives, rubber adhesives, and silicone adhesives can be used. Furthermore, it is preferable to use an adhesive that has a predetermined transparency.

[0098] If the light-resistant film according to this embodiment includes the adhesive layer described above, it is also preferable to further laminate a release sheet on the side of the adhesive layer opposite to the substrate. This makes it possible to protect the adhesive surface of the adhesive layer (the side of the adhesive layer opposite to the substrate) with the release sheet until it is attached to the adherend. The release sheet is not particularly limited as long as it has the desired release properties on its release surface (the surface in contact with the adhesive layer), and known release films such as resin films in which one side has been treated with a release agent can be used.

[0099] 3. Method for manufacturing lightfastness-enhancing film The method for manufacturing the light-resistant film according to this embodiment is not particularly limited. For example, it can be manufactured by applying a coating solution containing the aforementioned coating composition and optionally a solvent to a substrate and curing it to form a light-resistant layer.

[0100] The above-mentioned solvents can be used to improve coating properties, adjust viscosity, adjust solid content concentration, etc., and are not particularly limited as long as they dissolve curable components, etc.

[0101] Specific examples of the above solvents include alcohols such as methanol, ethanol, isopropanol, butanol, and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; esters such as ethyl acetate, butyl acetate, ethyl lactate, and γ-butyrolactone; ethers such as ethylene glycol monomethyl ether (methyl cellosolub), ethylene glycol monoethyl ether (ethyl cellosolub), diethylene glycol monobutyl ether (butyl cellosolub), and propylene glycol monomethyl ether; aromatic hydrocarbons such as benzene, toluene, and xylene; and amides such as dimethylformamide, dimethylacetamide, and N-methylpyrrolidone.

[0102] The coating solution of the coating composition can be applied by conventional methods, such as bar coating, knife coating, roll coating, blade coating, die coating, or gravure coating. After applying the coating solution of the coating composition, it is preferable to dry the coating film at 40 to 120°C for about 30 seconds to 5 minutes.

[0103] If the coating composition is curable by active energy rays, curing of the coating composition is performed by irradiating the coating film with active energy rays such as ultraviolet rays or electron beams under a nitrogen atmosphere. Ultraviolet irradiation can be performed using high-pressure mercury lamps, fusion H lamps, xenon lamps, etc., and the irradiation dose of ultraviolet rays is 50 to 1000 mW / cm². 2 , light intensity 50~1000mJ / cm 2 A certain degree is preferable. On the other hand, electron beam irradiation can be performed using an electron beam accelerator, and the electron beam irradiation dose is preferably around 10 to 1000 krad.

[0104] 4. How to use the lightfastness-enhancing film The light-resistant film according to this embodiment can be used as a component constituting a display body. In particular, it is preferable to use the light-resistant film according to this embodiment as a component constituting the outermost surface of the display surface of the display body. In this case, the light-resistant film according to this embodiment may be incorporated into the display body by being laminated on other components as the outermost surface component of the display body during the manufacturing of the display body. Alternatively, the light-resistant film according to this embodiment may be laminated on the display surface of a completed display body. When laminating the light-resistant film according to this embodiment onto a display body, the substrate-side surface of the light-resistant film and other components may be adhered together using an adhesive layer or the like.

[0105] As described above, the light-resistant film according to this embodiment exhibits excellent light resistance even when exposed to light for a long period of time. Therefore, the display devices on which the light-resistant film according to this embodiment is used are preferably in-vehicle display devices or outdoor display devices. These display devices are susceptible to strong light such as direct sunlight over long periods of time, but the light-resistant film according to this embodiment can exhibit good light resistance even against such light.

[0106] Furthermore, when the light-resistant film according to this embodiment is used in a display, an anti-reflective layer may be laminated on the side of the light-resistant layer opposite to the substrate. As described above, the light-resistant film according to this embodiment exhibits excellent recoating properties, so an anti-reflective layer can be formed well. The light-resistant film according to this embodiment with the anti-reflective layer formed thereon exhibits excellent low reflectivity.

[0107] Examples of the above-mentioned display devices are not particularly limited as long as they are capable of displaying desired images or videos, and include, for example, liquid crystal (LCD) displays, organic electroluminescent (OLED) displays, light-emitting diode (LED) displays, and electronic paper. Furthermore, the above-mentioned display device may also be a touch panel incorporating one of these displays or electronic paper.

[0108] The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit it. Accordingly, each element disclosed in the above embodiments is intended to include all design modifications and equivalents that fall within the technical scope of the present invention.

[0109] For example, other layers may be laminated between the substrate and the lightfastness-enhancing layer, or on the side of the substrate opposite to the lightfastness-enhancing layer.

[0110] In this specification, when "X~Y" (where X and Y are any numbers) is written, unless otherwise specified, it includes the meaning of "greater than or equal to X and less than or equal to Y," as well as "preferably greater than X" or "preferably less than Y." Similarly, when "greater than or equal to X" (where X is any number) is written, unless otherwise specified, it includes the meaning of "preferably greater than X," and when "less than or equal to Y" (where Y is any number) is written, unless otherwise specified, it also includes the meaning of "preferably less than Y." [Examples]

[0111] The present invention will be described in more detail below with reference to examples, but the scope of the present invention is not limited to these examples.

[0112] [Example 1] (1) Preparation of coating composition The curable component (A) is an organic-inorganic hybrid resin (manufactured by Arakawa Chemical Industries, Ltd., product name "Opstar Z7530", a mixture of a substance made by bonding acryloyl groups to silica nanoparticles with an average particle size of 50 nm (CV value: 28%) and a polyfunctional (meth)acrylate monomer) 100 parts by mass (calculated on a solid content basis; the same applies hereinafter), the ultraviolet absorber (B) is a triazine-based ultraviolet absorber (manufactured by BASF Japan, product name "Chinubin 400") 3.5 parts by mass, and the light stabilizer (C) is a hindered amine-based light stabilizer (manufactured by BASF Japan, A coating solution for a coating composition with a solid content of 35% by mass was prepared by mixing 2.7 parts by mass of product name "Chinubin 292", 0.05 parts by mass of a fluorine-based leveling agent (manufactured by Neos Corporation, product name "Futergent 602A", indicated as "D1" in Table 1) as a leveling agent (D), 1.1 parts by mass of a silicone filler (manufactured by Momentive Performance Materials Japan, product name "Tospar 145L", average particle size: 4.5 μm, refractive index: 1.43, indicated as "E1" in Table 1) as a filler (E), and 0.27 parts by mass of a carboxyl group-containing polymer modified product (manufactured by Kyoeisha Chemical Co., Ltd., product name "Floren G700") as a dispersant in propylene glycol monomethyl ether.

[0113] (2) Formation of a light-resistant layer A coating solution of the coating composition obtained in step (1) above was applied to one side of a triacetylcellulose film (manufactured by Konica Minolta, product name "Konica Tac KC8UAW", thickness 80 μm) used as a substrate, and dried at 70°C for 1 minute.

[0114] Next, under a nitrogen atmosphere, ultraviolet light was irradiated using an ultraviolet irradiation device (manufactured by iGraphics Co., Ltd., product name "iGrantage ECS-401GX") under the following conditions to form a light-resistant layer. This resulted in a light-resistant film consisting of a substrate and a 5 μm thick light-resistant layer. [Ultraviolet irradiation conditions] • Light source: High-pressure mercury lamp • Lamp power: 2kW Conveyor speed: 4.23 m / min ·Illuminance: 240mW / cm2 ·Light amount: 307mJ / cm 2

[0115] [Examples 2-7, Comparative Examples 1-5] A light-resistant film was manufactured in the same manner as in Example 1, except that the composition of the coating composition was changed as shown in Table 1.

[0116] Further details regarding the abbreviations and other terms listed in Table 1 are as follows: [Leveling agent] D1: Fluorine-based leveling agent (manufactured by Neos Co., Ltd., product name "Futergent 602A") D2: Silicone-based leveling agent (manufactured by Toray Dow Corning, product name "SH28") [Filler] E1: Silicone filler (manufactured by Momentive Performance Materials Japan, product name "Tospearl 145L", average particle size: 4.5 μm, refractive index: 1.43) E2: Silicone filler (manufactured by Momentive Performance Materials Japan, product name "Tospearl 130", average particle size: 3 μm, refractive index: 1.43) E3: Silicone filler (manufactured by Momentive Performance Materials Japan, product name "Tospearl 120", average particle size: 2 μm, refractive index: 1.43) E4: Acrylic filler (manufactured by Sekisui Chemical Co., Ltd., product name "SSX-101", average particle size: 1.5 μm, refractive index: 1.49) E5: Acrylic filler (manufactured by Sekisui Chemical Co., Ltd., product name "SSX-103", average particle size: 3 μm, refractive index: 1.49) E6: Acrylic filler (manufactured by Sekisui Chemical Co., Ltd., product name "SSX-105", average particle size: 5 μm, refractive index: 1.49)

[0117] [Test Example 1] (Measurement of haze value and total light transmittance) For the lightfastness-enhancing films prepared in the examples and comparative examples, background measurements were performed on glass, and then the haze value (%) and total light transmittance (%) at 23°C were measured by irradiating light from the surface side of the lightfastness-enhancing layer using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SH-7000"). Here, the haze value (%) was measured in accordance with JIS K7136:2000, and the total light transmittance (%) was measured in accordance with JIS K7361-1:1997. The results are shown in Table 2.

[0118] [Test Example 2] (Measurement of light transmittance in the near-ultraviolet and ultraviolet regions) For the light-resistant films prepared in the examples and comparative examples, background measurements were performed on glass, and then the light transmittance (%) was measured using a UV-VIS-NIR meter (Shimadzu Corporation, product name "UV-3600") with a measurement wavelength of 310 to 830 nm. Based on these measurement results, the average value (%) of the light transmittance at wavelengths of 310 to 380 nm (near-ultraviolet region) and the average value (%) of the light transmittance at wavelengths of 380 to 420 nm (ultraviolet region) were calculated. These results are shown in Table 2.

[0119] [Test Example 3] (Measurement of transmission clarity) For the lightfastness-enhancing films prepared in the examples and comparative examples, the transmission clarity (image clarity) was measured using an image clarity meter (manufactured by Suga Test Instruments Co., Ltd., product name "ICM-1T"), in accordance with the transmission method of JIS K7374:2007, by irradiating light from the side with the lightfastness-enhancing layer. The comb widths of the optical combs used in the image clarity meter were 0.125 mm, 0.25 mm, 0.5 mm, 1.0 mm, and 2.0 mm. The total value (%) of the transmission clarity measured for each optical comb is shown in Table 2.

[0120] [Test Example 4] (Measurement of 60° gross) The 60° gloss (%) of the lightfastness-enhancing layer side of the lightfastness-enhancing films prepared in the examples and comparative examples was measured using a gloss meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "VG7000") in accordance with JIS Z8741:1997. The results are shown in Table 2.

[0121] [Test Example 5] (Measurement of diffuse reflectance) A sample for measurement was obtained by bonding the substrate-side surface of the light-resistant film prepared in the examples and comparative examples to a blackboard using an adhesive. For the light-resistant layer side of this sample, a background measurement was performed on a blackboard without the light-resistant film attached. Then, the diffuse reflectance (%) was measured using a UV-VIS-NIR meter (Shimadzu Corporation, product name "UV-3600"). This measurement was performed by subtracting the specular reflectance from the total reflectance using the SCE method (a method that removes specular reflection). The results are shown in Table 2.

[0122] [Test Example 6] (Measurement of water contact angle) The substrate-side of the lightfastness-improving film produced in the examples and comparative examples was attached to one side of a glass plate. The glass plate was then placed on the test stand of an automatic contact angle meter (Kyowa Interface Science Co., Ltd., product name "DM-701") with the side with the lightfastness-improving film facing upwards. Next, 2 μL of pure water was dropped onto the lightfastness-improving layer side of the lightfastness-improving film, and the contact angle (°) immediately after dropping was measured using the contact angle meter. This was defined as the water contact angle (°). The results are shown in Table 2.

[0123] [Test Example 7] (Measurement of pencil hardness) The pencil hardness of the light-resistant layer side of the light-resistant improved film manufactured in the examples and comparative examples was measured in accordance with JIS K5600-5-4. A pencil scratch hardness tester (manufactured by Yasuda Seiki Seisakusho Co., Ltd., product name "No. 553-M") was used for the measurement. A pencil named "UNI" manufactured by Mitsubishi Pencil Co., Ltd. was used, and the pencil was brought into contact with the measurement surface at a 45° angle. A load of 750g was applied, and the pencil was moved for 7mm or more. The test was repeated 5 times for each type of pencil, varying the hardness of the pencil. Pencils that did not show scratches on the light-resistant layer side 3 or more times were identified, and the hardness of the highest among them was defined as the pencil hardness. The results are shown in Table 2.

[0124] [Test Example 8] (Evaluation of scratch resistance) For the lightfastness-improving layer side of the lightfastness-improving films produced in the examples and comparative examples, 250 g / cm³ of #0000 steel wool was used in accordance with JIS K5600-5-10. 2 After rubbing the surface 10 cm back and forth 10 times under a load, the number of scratches that appeared on the surface was counted, and the scratch resistance was evaluated according to the following criteria. The results are shown in Table 2. ○: The number of wounds was 0. ×: There was one or more wounds.

[0125] [Test Example 9] (Evaluation of anti-glare properties) A sample for measurement was obtained by bonding the substrate-side surface of the light-resistant film prepared in the examples and comparative examples to a blackboard using an adhesive. A three-wavelength fluorescent lamp was turned on above the light-resistant layer side of the sample, and the light was reflected off that surface. The anti-glare properties were evaluated by visually inspecting the reflected light according to the following criteria. The results are shown in Table 2. ◎: The outline of the fluorescent light, visible due to reflection from the light-resistant film, is blurred. ○: The outline of the fluorescent light, visible due to reflection from the light-resistant film, is slightly blurred. △: The outline of the fluorescent light, visible due to reflection from the light-resistant film, is slightly blurred. ×; The outlines of the fluorescent lights, visible due to reflection from the light-resistant film, were not blurred at all.

[0126] [Test Example 10] (Evaluation of glare) The light-resistant films manufactured in the examples and comparative examples were laminated onto the display surface of a tablet device (Apple Inc., product name "NEW iPad®", resolution: 264 ppi) so that the substrate side was in contact with the display surface. Then, with the tablet device displayed entirely in green (RGB values ​​(R, G, B) = 0, 255, 0), the presence or absence of glare was visually checked. Based on the results, glare was evaluated according to the following criteria. The results are shown in Table 2. ◎: No glare caused by the lightfastness-enhancing film was observed at all. ○: A slight glare caused by the lightfastness-enhancing film was observed. △: Some glare was observed due to the lightfastness-enhancing film. ×: Glare caused by the light-resistant film was observed throughout the entire surface.

[0127] [Test Example 11] (Evaluation of recoating properties) Ten parts by mass of an acrylic resin containing a polyfunctional (meth)acrylate (manufactured by Arakawa Chemical Co., Ltd., product name "Beamset 575CB", solids content 100%), 24.4 parts by mass of hollow silica fine particles (manufactured by JGC Catalysts Co., Ltd., product name "Thru-Ria 4320", solids content 20.5%), 0.3 parts by mass of a photopolymerization initiator (manufactured by BASF, product name "OMNIRAD 907", solids content 100%), and 0.2 parts by mass of a fluorine-based antifouling agent (manufactured by DIC Corporation, product name "Megafac RS-90", solids content 10%) were mixed in a mixed solvent of methyl isobutyl ketone and cyclohexanone (mixing ratio 1:1) to obtain a coating solution for an anti-reflective layer-forming composition with a solids content of 1.0 to 2.0% by mass.

[0128] Next, the coating solution obtained as described above was applied to the light-resistant layer side of the light-resistant films prepared in the examples and comparative examples, so that the thickness after drying was 100 nm. The behavior of the coating solution at that time was observed, and the recoatability was evaluated according to the following criteria. The results are shown in Table 2. ○: No repellency of the coating solution occurred. ×: The coating liquid was repelled.

[0129] [Test Example 12] (Evaluation of low reflectivity) The substrate-side surface of the light-resistant film prepared in the examples and comparative examples was bonded to a blackboard using an adhesive to obtain a measurement sample (before the formation of the anti-reflective layer). For the light-resistant layer-side surface of this measurement sample, a background measurement was performed using a blackboard without the light-resistant film attached. Then, the total reflectance (%) was measured as the average value in the wavelength range of 400-600 nm using a UV-VIS-NIR meter (Shimadzu Corporation, product name "UV-3600"). This measurement was performed using the SCI method (a method that includes specular reflection). The total reflectance (%) obtained here was defined as the "total reflectance (%) before the formation of the anti-reflective layer." The results are shown in Table 2.

[0130] On the other hand, a coating solution of the anti-reflective layer forming composition, prepared in the same manner as in Test Example 11, was applied to the light-resistant layer side of the light-resistant films prepared in the Examples and Comparative Examples, so that the thickness after drying was 100 nm. Then, the resulting coating film was irradiated with ultraviolet light under a nitrogen atmosphere using an ultraviolet irradiation device (I-Graphics Co., Ltd., product name "I-Grantage ECS-401GX") under the following conditions to form an anti-reflective layer on the light-resistant layer. This resulted in obtaining a light-resistant film with a laminated anti-reflective layer. [Ultraviolet irradiation conditions] • Light source: High-pressure mercury lamp • Lamp power: 2kW Conveyor speed: 4.23 m / min ·Illuminance: 240mW / cm 2 ·Light amount: 307mJ / cm 2

[0131] As described above, the light-resistant film with the anti-reflective layer laminated was bonded to a blackboard using an adhesive to obtain a measurement sample (after the anti-reflective layer was formed). The total reflectance (%) of the anti-reflective layer side of this measurement sample was then measured in the same manner as described above. The obtained total reflectance (%) was defined as "total reflectance (%) after the formation of the anti-reflective layer". The results are shown in Table 2.

[0132] As described above, the difference in total reflectance (points) was calculated by subtracting the total reflectance (%) after the formation of the anti-reflective layer from the total reflectance (%) before the formation of the anti-reflective layer. The results are shown in Table 2.

[0133] Furthermore, if the total reflectance (%) before the formation of the anti-reflective layer was less than 2%, the low reflectivity was evaluated based on the following criterion (A). Also, if the total reflectance (%) before the formation of the anti-reflective layer was 2% or more, the low reflectivity was evaluated based on the following criterion (B). These evaluation results are shown in Table 2. [Standard (A)] ◎: The total reflectance (%) after the formation of the anti-reflective layer was 1.0% or less. ○: The total reflectance (%) after the formation of the anti-reflective layer was greater than 1.0% and 1.2% or less. △: The total reflectance (%) after the formation of the anti-reflective layer was greater than 1.2% and 1.5% or less. ×: The total reflectance (%) after the formation of the anti-reflective layer was greater than 1.5%. [Standard (B)] ◎: The difference in total reflectance was 2.5 points or more. ○: The difference in total reflectance was between 2.0 points and 2.5 points. △: The difference in total reflectance was between 1.5 points and 2.0 points. ×: The difference in total reflectance was less than 1.5 points.

[0134] Note that Comparative Example 1, which received a "×" rating for recoating ability in Test Example 11, was not included in this test.

[0135] [Test Example 13] (Evaluation of lightfastness: Adhesion) The lightfastness-enhancing layer side of the lightfastness-enhancing films prepared in the examples and comparative examples was irradiated with ultraviolet light for 400 hours using a UV fade meter U48 manufactured by Suga Test Instruments Co., Ltd., in accordance with JIS B7751-2007.

[0136] Subsequently, in accordance with JIS K5600-5-6, 100 grid squares of 1 mm x 1 mm were formed on the lightfastness-enhancing layer using a utility knife. Then, under conditions of 23°C and 50% RH, adhesive tape (Nichiban cellophane tape) was applied to the grid using a squeegee. After 30 seconds, the adhesive tape was peeled off at a 90° angle. The number of grid squares remaining on the substrate without separating from the substrate was then counted. The results are shown in Table 2.

[0137] [Test Example 14] (Evaluation of lightfastness: color change) In the lightfastness-enhancing films prepared in the examples and comparative examples, background measurements were performed on the side with the lightfastness-enhancing layer. Then, using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SH7000"), light was irradiated onto the side with the lightfastness-enhancing layer to measure CIE1976L * a * b * Chromaticity a defined by the color system * and chromaticity b * The initial chromaticity a was measured. These measurement results were used to determine the initial chromaticity a. * and chromaticity b * This is shown in Table 2.

[0138] Furthermore, a light-resistant film was prepared by irradiating it with ultraviolet light for 400 hours, similar to the method used in Test Example 13. The light-resistant layer side of this light-resistant film was also treated with CIE1976L in the same manner as described above. * a * b * Chromaticity a defined by the color system * and chromaticity b * The value was measured, and the absolute value of the difference from the initial value was calculated. The results are also shown in Table 2.

[0139] In addition, for Comparative Examples 2-4, where the lightfastness-improving layer separated from the substrate for all grid squares in Test Example 13, this test was not performed.

[0140] [Table 1]

[0141] [Table 2]

[0142] As is clear from Table 2, the light-resistant films produced in the examples exhibited excellent recoatability, low reflectivity, and light resistance. Furthermore, the light-resistant films produced in the examples also showed good results in terms of scratch resistance, anti-glare, and anti-glare properties. [Industrial applicability]

[0143] The light-resistant film of the present invention can be suitably used as a component of an in-vehicle display or an outdoor display.

Claims

1. A light-resistant film comprising a base material and a light-resistant layer provided on one side of the base material, The light-resistant layer is formed from a coating composition containing a curable component (A), an ultraviolet absorber (B), a light stabilizer (C), a leveling agent (D), and a filler (E). The average particle size of the filler (E) is 1 μm or more and 20 μm or less. When the filler (E) is an acrylic resin filler, the average particle size of the acrylic resin filler is 1 μm or more and 4.5 μm or less. The diffuse reflectance of the aforementioned lightfastness-enhancing layer is 3% or less as an average value for light with wavelengths of 380 nm to 780 nm. The water contact angle of the light-resistant layer on the side opposite to the substrate is less than 80°. The light transmittance of the aforementioned light-resistant film is 40% or less as an average value for light with wavelengths of 310 nm to 380 nm. The aforementioned light transmittance is the light transmittance measured using a triacetylcellulose film as the substrate. The side of the light-resistant layer opposite to the substrate becomes the side on which the anti-reflective layer is laminated. Used as a component of a vehicle-mounted display unit or an outdoor-installed display unit. A light-resistant film characterized by the following features.

2. A light-resistant film comprising a base material and a light-resistant layer provided on one side of the base material, The light-resistant layer is formed from a coating composition containing a curable component (A), an ultraviolet absorber (B), a light stabilizer (C), a leveling agent (D), and a filler (E). The filler (E) is at least one of an acrylic resin filler and a silicone filler. The average particle size of the acrylic resin filler is 1 μm or more and 4.5 μm or less. The diffuse reflectance of the aforementioned lightfastness-enhancing layer is 3% or less as an average value for light with wavelengths of 380 nm to 780 nm. The water contact angle of the light-resistant layer on the side opposite to the substrate is less than 80°. The light transmittance of the aforementioned light-resistant film is 40% or less as an average value for light with wavelengths of 310 nm to 380 nm. The aforementioned light transmittance is the light transmittance measured using a triacetylcellulose film as the substrate. The side of the light-resistant layer opposite to the substrate becomes the side on which the anti-reflective layer is laminated. Used as a component of a vehicle-mounted display unit or an outdoor-installed display unit. A light-resistant film characterized by the following features.

3. The light-resistant film according to claim 1 or 2, characterized in that the light stabilizer (C) is a hindered amine-based light stabilizer.

4. CIE1976L in the aforementioned light-resistant film ＊ a ＊ b ＊ Chromaticity a defined by the color system ＊ The chromaticity a after performing a 400-hour lightfastness test on the lightfastness-improving film using an ultraviolet carbon arc lamp in accordance with JIS B7751:2007. ＊ The light-resistant film according to any one of claims 1 to 3, characterized in that the absolute value of the difference between it and is 0 or greater and 3 or less.

5. The chromaticity b defined by the CIE1976L ＊ a ＊ b ＊ in the light resistance improving film, and the chromaticity b ＊ after conducting a light resistance test using an ultraviolet carbon arc lamp in accordance with JIS B7751:2007 for 400 hours on the light resistance improving film ＊ where the absolute value of the difference from is 0 or more and 3 or less, the light resistance improving film according to any one of claims 1 to 4.

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