Antiviral optical film, image display panel, and image display device

Abstract

Provided is an optical film capable of improving antiviral properties while suppressing a decrease in visibility. The antiviral optical film has, on at least one surface thereof, a resin layer containing a binder resin and an antiviral agent, and the surface of the resin layer has an interface expansion area ratio (Sdr) of 1.0 * 10 <-5 > to 1.5 * 10 <-1 >, said interface expansion area ratio (Sdr) being defined by ISO 25178-2: 2012.

Description

Technical Field

[0001] The present disclosure relates to an antiviral optical film, an image display panel, and an image display device. Background Art

[0002] Optical films are sometimes laminated on the surfaces of image display devices such as televisions, notebook computers, desktop computer monitors, and smartphones to prevent scratches.

[0003] In image display devices having a touch panel function, there are many opportunities to touch the surface of the image display device with fingers. If the antibacterial property of the optical film is insufficient, bacteria may cause adverse effects on the human body. Therefore, as in Patent Document 1, an optical film with antibacterial property is proposed.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. WO2015 / 098817 Summary of the invention

[0007] Problems to be solved by the invention

[0008] With the spread of the novel coronavirus infection in recent years, optical films are required to have not only antibacterial properties but also antiviral properties. Even if the optical film of Patent Document 1 has sufficient antibacterial properties, it often has insufficient antiviral properties.

[0009] Generally, the amount of the antiviral agent used to impart antiviral properties is greater than the amount of the antibacterial agent used to impart antibacterial properties. Therefore, it is believed that in the optical film of Patent Document 1, if the content of the antibacterial agent is increased, antiviral properties can be imparted. However, when the content of the antibacterial agent is increased, the visibility of the image display device is reduced.

[0010] An object of the present disclosure is to provide an optical film, an image display panel, and an image display device capable of improving antiviral properties while suppressing a decrease in visibility.

[0011] Means for solving problems

[0012] The present disclosure provides the following optical films, image display panels, and image display devices [1] to [9].

[0013] [1] An antiviral optical film, wherein:

[0014] The optical film has a resin layer containing a binder resin and an antiviral agent on at least one surface.

[0015] The surface of the resin layer has an interface development area ratio (Sdr) of 1.0×10 -5 Above 1.5×10 -1 the following.

[0016] [2] The antiviral optical film according to [1], wherein the content of the antiviral agent is 1.0 part by mass or more and 15.0 parts by mass or less based on 100 parts by mass of the binder resin.

[0017] [3] The antiviral optical film according to [1] or [2], wherein the antiviral agent is an inorganic antiviral agent.

[0018] [4] The antiviral optical film according to any one of [1] to [3], wherein the binder resin comprises a cured product of an ionizing radiation-curable resin composition.

[0019] [5] The antiviral optical film according to any one of [1] to [4], wherein the resin layer further contains a matting agent.

[0020] [6] The antiviral optical film according to any one of [1] to [5], wherein the optical film comprises a substrate and the resin layer formed on one surface of the substrate.

[0021] [7] The antiviral optical film according to any one of [1] to [6], wherein the total light transmittance according to JIS K7361-1:1997 is 85.0% or more.

[0022] [8] The antiviral optical film according to any one of [1] to [7], wherein the haze according to JIS K7136:2000 is 80.0% or less.

[0023] [9] An image display panel, wherein:

[0024] The image display panel comprises a display element and the antiviral optical film according to any one of [1] to [8] disposed on the display element.

[0025] The antiviral optical film is disposed on the outermost surface of the image display panel, and is disposed so that the surface of the antiviral optical film on the resin layer side faces the opposite side to the display element.

[0026]

[10] An image display device comprising the image display panel described in [9].

[0027] Effects of the Invention

[0028] The optical film, the image display panel, and the image display device of the present disclosure can improve antiviral properties while suppressing a decrease in visibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic cross-sectional view showing one embodiment of the optical film of the present disclosure.

[0030] Figure 2 is a cross-sectional view showing one embodiment of the image display device of the present disclosure. DETAILED DESCRIPTION

[0031] Hereinafter, embodiments of the present disclosure will be described.

[0032] [Antiviral optical film]

[0033] The antiviral optical film disclosed herein has a resin layer containing a binder resin and an antiviral agent on at least one surface, and the surface of the resin layer has an interface development area ratio (Sdr) of 1.0×10 -5 Above 1.5×10 -1 the following.

[0034] Figure 1 is a schematic cross-sectional view of the cross-sectional shape of the optical film 100 of the present disclosure.

[0035] Figure 1 The optical film 100 has a resin layer including a binder resin 21 and an antiviral agent 22 on at least one surface. Figure 1 The optical film 100 has a resin layer 20 on a substrate 10, and the surface of the resin layer 20 becomes one surface of the optical film 100. Figure 1 The resin layer 20 further includes a matting agent 22 .

[0036] Figure 1 That is, the scale of each layer constituting the optical film 100 and the scale of the surface shape are schematically shown for ease of illustration and are different from the actual scale. Figure 2 Same here.

[0037] The optical film disclosed herein is not limited to Figure 1 For example, the optical film may be a single-layer structure of a resin layer, or may be a laminated structure of three or more layers including a substrate and layers other than the resin layer.

[0038] A preferred embodiment of the optical film is one in which a resin layer is provided on one surface of a substrate, and a surface of the resin layer is a surface of the optical film.

[0039] <Resin Layer>

[0040] The optical film of the present disclosure has a resin layer including a binder resin and an antiviral agent on at least one surface.

[0041] When the optical film has a single-layer structure of a resin layer, the resin layer is provided on both surfaces of the optical film. When the optical film has a structure having a resin layer on a substrate, the resin layer may be disposed on the surface of the optical film.

[0042] Surface Shape

[0043] The surface area ratio of the interface specified in ISO 25178-2:2012, i.e., Sdr, of the resin layer needs to be 1.0×10 -5 Above 1.5×10 -1 the following.

[0044] When the surface area of ​​the resin layer surface is A1 and the area when the resin layer surface is projected onto the XY plane is A0, Sdr can be expressed by the following formula: It can be said that the larger the Sdr, the larger the surface area of ​​the resin layer.

[0045] Sdr=(A1 / A0)-1

[0046] Sdr is less than 1.0×10 -5 In the case of Sdr less than 1.0×10 -5 In the case of excessive addition of antiviral agent, the antiviral property can be improved. However, when excessive addition of antiviral agent is performed, visibility is easily reduced.

[0047] When Sdr exceeds 1.5×10 -1 In the case of , it is impossible to suppress the reduction in visibility of the image display device. As described above, it can be said that the larger the Sdr, the larger the surface area of ​​the resin layer. In other words, it can be said that the larger the Sdr, the more the surface shape of the resin layer has a shape in which the concavities and convexities are densely arranged and / or a shape in which the inclination angle of the concavities and convexities is large. Therefore, when Sdr exceeds 1.5×10 -1 In such a case, the visibility of the image display device is easily reduced due to the reduction in resolution or the transmission of transmittance.

[0048] The lower limit of Sdr is preferably 2.0×10 -5 More preferably, 4.0×10 -5 More preferably, 5.0×10 -5 The upper limit of Sdr is preferably 1.3×10 -1 Less than, more preferably 6.0×10 -2 Below, more preferably 5.0×10 -3 the following.

[0049] In the technical features described in this specification, when multiple upper limit options and lower limit options are shown respectively, one selected from the upper limit option and one selected from the lower limit option can be combined as an implementation of the numerical range.

[0050] For example, in the case of Sdr, 1.0×10 -5 Above 1.5×10 -1 Below, 1.0×10 -5 Above 1.3×10 -1 Below, 1.0×10 -5 Above 6.0×10 -2 Below, 1.0×10 -5 Above 5.0×10 -3 Below, 2.0×10 -5 Above 1.5×10 -1 Below, 2.0×10 -5 Above 1.3×10 -1 Below, 2.0×10 -5 Above 6.0×10 -2 Below, 2.0×10 -5 Above 5.0×10 -3 Below, 4.0×10 -5 Above 1.5×10 -1 Below, 4.0×10 -5 Above 1.3×10 -1 Below, 4.0×10 -5 Above 6.0×10 -2 Below, 4.0×10 -5 Above 5.0×10 -3 The following numerical ranges are used for implementation.

[0051] Sdr, and Sa, Sal, and Spc described later are measured using a non-contact surface shape measuring device such as a confocal laser microscope and an interference microscope. Examples of the confocal laser microscope include the "VK-X" series of KEYENCE. In addition, Sdr, Sa, Sal, and Spc can be easily calculated by using the "Multi-file Analysis Application" of the "VK-X" series.

[0052] The measurement conditions for measuring Sdr, Sa, Sal, and Spc using the above-mentioned "VK-X" series are in accordance with the conditions described in the examples. For example, the F-operation is preferably set to plane tilt correction (region designation). In addition, one side of the measurement area is 50 μm to 200 μm, and the measurement points are 500 to 2000 points on each side.

[0053] In this specification, unless otherwise specified, surface shape (Sdr, Sa, Sal, Spc) and optical properties (haze, total light transmittance, etc.) refer to the average value of the measured values ​​at 16 locations.

[0054] In this specification, the 16 measurement points are: the area 1 cm away from the outer edge of the measurement sample is removed as a blank, and for the remaining area, when a line is drawn that divides the longitudinal and transverse regions into 5 equal parts, the 16 intersections are used as the center of the measurement. For example, in the case where the measurement sample is a rectangle, the area 0.5 cm away from the outer edge of the rectangle is removed as a blank, and for the remaining area, a dotted line is drawn that divides the longitudinal and transverse regions into 5 equal parts, and the 16 intersections of the dotted lines are used as the center for measurement, and the parameters are calculated with the average value. In the case where the measurement sample is a shape other than a rectangle, such as a circle, an ellipse, a triangle, or a pentagon, a rectangle inscribed in these shapes is drawn, and for the above rectangle, the 16 points of measurement are performed by the above method.

[0055] In this specification, unless otherwise specified, the surface shape (Sdr, Sa, Sal, Spc) and optical properties (haze, total light transmittance, etc.) are measured at a temperature of 23±5°C and a relative humidity of 40% to 65%. In addition, before each measurement, the target sample is exposed to the above atmosphere for 30 minutes to 60 minutes before the measurement.

[0056] The surface of the resin layer preferably has an arithmetic mean height (Sa) defined in ISO 25178-2:2012 of 0.04 μm or more and 0.70 μm or less.

[0057] By setting Sa to 0.04 μm or more, the antiviral property can be further improved, and by setting Sa to 0.70 μm or less, the decrease in visibility can be further suppressed.

[0058] The lower limit of Sa is more preferably 0.05 μm or more, more preferably 0.06 μm or more, and more preferably 0.07 μm or more. The upper limit of Sa is more preferably 0.60 μm or less, more preferably 0.40 μm or less, and more preferably 0.25 μm or less.

[0059] Embodiments of the preferred range of Sa include 0.04 μm to 0.70 μm, 0.04 μm to 0.60 μm, 0.04 μm to 0.40 μm, 0.04 μm to 0.25 μm, 0.05 μm to 0.70 μm, 0.05 μm to 0.60 μm, 0.05 μm to 0.40 μm, 0.05 μm to 0. .25μm or less, 0.06μm or more and 0.70μm or less, 0.06μm or more and 0.60μm or less, 0.06μm or more and 0.40μm or less, 0.06μm or more and 0.25μm or less, 0.07μm or more and 0.70μm or less, 0.07μm or more and 0.60μm or less, 0.07μm or more and 0.40μm or less, 0.07μm or more and 0.25μm or less.

[0060] The surface of the resin layer preferably has a minimum autocorrelation length, Sal, specified in ISO 25178-2:2012 of 9.8 μm or more and 14.0 μm or less.

[0061] Sal is a parameter that focuses on the lateral direction. The smaller Sal is, the more densely concave and convex the surface of the resin layer is, and the larger Sal is, the wider the intervals between concave and convex the surface of the resin layer is. For the value of "average length RSm of roughness curve elements" specified by JIS B0601, fine concave and convex have almost no effect, and only large concave and convex have an effect. On the other hand, for the value of Sal, not only large concave and convex have an effect, but also fine concave and convex have an effect, which is different from RSm. In addition, even if the intervals between concave and convex are wide, if the convex portion is small or the concave and convex shape is complex, Sal tends to become smaller. In addition, if the convex portion is a monotonous shape, there is a tendency for Sal to become larger.

[0062] By setting Sal to 9.8 μm or more, it is possible to further easily suppress a decrease in visibility. By setting Sal to 14.0 μm or less, it is possible to further easily improve antiviral properties.

[0063] The lower limit of Sal is more preferably 10.0 μm or more, more preferably 10.2 μm or more, and more preferably 10.5 μm or more. The upper limit of Sal is more preferably 13.0 μm or less, more preferably 12.5 μm or less, and more preferably 12.0 μm or less.

[0064] Embodiments of the preferred range of Sal include 9.8μm to 14.0μm, 9.8μm to 13.0μm, 9.8μm to 12.5μm, 9.8μm to 12.0μm, 10.0μm to 14.0μm, 10.0μm to 13.0μm, 10.0μm to 12.5μm, 10.0μm to 12.0μm, 10.2μm to 14.0μm, 10.2μm to 13.0μm, 10.2μm to 12.5μm, 10.2μm to 12.0μm, 10.5μm to 14.0μm, 10.5μm to 13.0μm, 10.5μm to 12.5μm, 10.5μm to 12.0μm.

[0065] The surface of the resin layer preferably has an arithmetic mean curvature of the peak apex defined in ISO 25178-2:2012, namely, Spc, of 400 [1 / mm] or more and 950 [1 / mm] or less.

[0066] Spc is a parameter representing the arithmetic mean of the principal curvatures of the peak apex in the measurement area. The smaller the Spc, the greater the curvature of the peak apex on the surface of the resin layer and the rounder it is. The larger the Spc, the smaller the curvature of the peak apex on the surface of the resin layer and the sharper it is.

[0067] By making Spc 400 [1 / mm] or more, it is easy to further suppress the reduction of visibility. By making Spc 950 [1 / mm] or less, it is easy to further improve the antiviral property.

[0068] The lower limit of Spc is more preferably 410 [1 / mm] or more, more preferably 415 [1 / mm] or more, and more preferably 420 [1 / mm] or more. The upper limit of Spc is more preferably 900 [1 / mm] or less, more preferably 800 [1 / mm] or less, and more preferably 700 [1 / mm] or less.

[0069] Embodiments of the preferred range of Spc include 400 [1 / mm] to 950 [1 / mm], 400 [1 / mm] to 900 [1 / mm], 400 [1 / mm] to 800 [1 / mm], 400 [1 / mm] to 700 [1 / mm], 410 [1 / mm] to 950 [1 / mm], 410 [1 / mm] to 900 [1 / mm], 410 [1 / mm] to 800 [1 / mm], 410 [1 / mm] to 700 [1 / mm] [1 / mm] or less, 415[1 / mm] or more and 950[1 / mm] or less, 415[1 / mm] or more and 900[1 / mm] or less, 415[1 / mm] or more and 800[1 / mm] or less, 415[1 / mm] or more and 700[1 / mm] or less, 420[1 / mm] or more and 950[1 / mm] or less, 420[1 / mm] or more and 900[1 / mm] or less, 420[1 / mm] or more and 800[1 / mm] or less, 420[1 / mm] or more and 700[1 / mm] or less.

[0070] 《Method for forming resin layer》

[0071] The resin layer having the above-mentioned surface shape can be formed, for example, by (A) shaping with an embossing roll, (B) etching treatment, (C) molding with a mold, (D) coating film formation by coating, etc. Among these methods, (C) molding with a mold is preferred in order to easily obtain a stable surface shape, and (D) coating film formation by coating is preferred in order to cope with productivity and variety.

[0072] In the method of (C), for example, a resin layer composition containing a binder resin and an antiviral agent is poured into a mold, and the molded composition is taken out of the mold, thereby forming a resin layer. The mold uses a mold that reverses the surface shape of the resin layer. Such a mold can be made, for example, by the following methods (c1-1) to (c1-2) or the following method (c2).

[0073] (c1-1) A shape is created by simulation so that Sdr and the like fall within a predetermined range. Furthermore, the simulated shape is inverted.

[0074] (c1-2) A mold is obtained by engraving metal using a laser so that the inverted shape is reflected.

[0075] (c2) A mold having a shape reversed from that of the resin layer produced in (D) is obtained by a general electroforming method.

[0076] When forming the resin layer by (D), for example, the following method (d1) may be used.

[0077] (d1) A method of forming a resin layer having projections and depressions mainly due to the matting agent by applying a resin layer coating liquid containing a binder resin, an antiviral agent, and drying the coating liquid.

[0078] Binder resin

[0079] In order to improve the scratch resistance, the binder resin preferably contains a cured product of a curable resin composition such as a cured product of a thermosetting resin composition or a cured product of an ionizing radiation curable resin composition, and more preferably contains a cured product of an ionizing radiation curable resin composition.

[0080] The binder resin may contain a thermoplastic resin within a range not impairing the effects of the present disclosure.

[0081] The ratio of the cured product of the curable resin composition to the total amount of the binder resin is preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass.

[0082] The thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating.

[0083] Examples of the thermosetting resin include acrylic resins, urethane resins, phenolic resins, urea-melamine resins, epoxy resins, unsaturated polyester resins, silicone resins, etc. In the thermosetting resin composition, a curing agent is added to these curable resins as necessary.

[0084] The ionizing radiation curable resin composition is a composition comprising a compound having an ionizing radiation curable functional group (hereinafter, also referred to as an "ionizing radiation curable compound"). As the ionizing radiation curable functional group, ethylenically unsaturated bond groups such as (meth) acryloyl, vinyl, allyl, and epoxy, oxetanyl, etc. can be cited. As the ionizing radiation curable compound, a compound preferably having an ethylenically unsaturated bond group, more preferably a compound having more than two ethylenically unsaturated bond groups, wherein a polyfunctional (meth) acrylate compound having more than two ethylenically unsaturated bond groups is further preferred. As the polyfunctional (meth) acrylate compound, any one of a monomer and an oligomer can be used.

[0085] Ionizing radiation refers to radiation in electromagnetic waves or charged particle beams that has an energy quantum that can cause molecules to polymerize or cross-link. Usually, ultraviolet light (UV) or electron beam (EB) is used. In addition, electromagnetic waves such as X-rays and gamma rays, alpha rays, and charged particle beams such as ion beams can also be used.

[0086] Examples of the bifunctional (meth)acrylate monomers in the polyfunctional (meth)acrylate compounds include ethylene glycol di(meth)acrylate, bisphenol A tetraethoxy diacrylate, bisphenol A tetrapropoxy diacrylate, and 1,6-hexanediol diacrylate.

[0087] Examples of the trifunctional or higher-functional (meth)acrylate monomer include trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol tetra(meth)acrylate, and isocyanuric acid-modified tri(meth)acrylate.

[0088] The (meth)acrylate monomers may be monomers in which a part of the molecular skeleton is modified. For example, the (meth)acrylate monomers may be monomers in which a part of the molecular skeleton is modified by ethylene oxide, propylene oxide, caprolactone, isocyanuric acid, alkyl, cyclic alkyl, aromatic, bisphenol, etc.

[0089] Examples of the polyfunctional (meth)acrylate oligomer include acrylate polymers such as urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, and polyether (meth)acrylate.

[0090] Urethane (meth)acrylate is obtained, for example, by reaction of polyol and organic diisocyanate with hydroxy (meth)acrylate.

[0091] Preferred epoxy (meth)acrylates are (meth)acrylates obtained by reacting trifunctional or higher aromatic epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, etc. with (meth)acrylic acid; (meth)acrylates obtained by reacting difunctional or higher aromatic epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, etc. with polyacids and (meth)acrylic acid; and (meth)acrylates obtained by reacting difunctional or higher aromatic epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, etc. with phenols and (meth)acrylic acid.

[0092] The number average molecular weight of the multifunctional (meth)acrylate oligomer is preferably 500 to 3000, preferably 600 to 2000, and more preferably 700 to 1200.

[0093] In this specification, the weight average molecular weight is measured by GPC analysis and is an average molecular weight converted into standard polystyrene.

[0094] In addition, for the purpose of adjusting the viscosity of the resin layer coating solution, a monofunctional (meth)acrylate may be used as an ionizing radiation curable compound. Examples of the monofunctional (meth)acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and isobornyl (meth)acrylate.

[0095] The above-mentioned ionizing radiation curable compounds can be used alone or in combination of two or more.

[0096] When the ionizing radiation curable compound is an ultraviolet curable compound, the ionizing radiation curable composition preferably contains additives such as a photopolymerization initiator and a photopolymerization accelerator.

[0097] Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler's ketone, benzoin, benzoin dimethyl ether, benzoylbenzoate, α-acyl oxime ester, thioxanthones and the like.

[0098] The photopolymerization accelerator can reduce the polymerization hindrance caused by air during curing and increase the curing speed. Examples of the accelerator include isopentyl p-dimethylaminobenzoate and ethyl p-dimethylaminobenzoate.

[0099] When the binder resin includes a cured product of an ionizing radiation curable resin composition, the ionizing radiation curable resin composition preferably includes a polyfunctional (meth)acrylate monomer and a polyfunctional (meth)acrylate oligomer.

[0100] The mass ratio of the polyfunctional (meth)acrylate monomer to the polyfunctional (meth)acrylate oligomer is preferably 1:99 to 30:70, more preferably 5:90 to 20:80, and even more preferably 7:93 to 15:85.

[0101] By making the polyfunctional (meth)acrylate monomer into a predetermined ratio or more, the scratch resistance of a resin layer can be improved easily.

[0102] By making the polyfunctional (meth)acrylate oligomer more than the specified ratio, the viscosity of the resin layer coating liquid can be increased, and the matting agent can be easily suppressed from sinking under the resin layer. Therefore, it is easy to make Sdr 1.0×10 -5In addition, by making the multifunctional (meth) acrylate oligomer more than the prescribed ratio, it is possible to easily suppress the generation of cracks in the resin layer, and it is possible to easily suppress the fall-off of the antiviral agent and the matting agent from the resin layer. On the other hand, if the proportion of the multifunctional (meth) acrylate oligomer is too much, the strength of the resin layer is sometimes reduced. In addition, if the viscosity of the resin layer coating solution is too high, Sdr sometimes becomes too large. Therefore, the ionizing radiation curable resin composition preferably comprises a prescribed amount of multifunctional (meth) acrylate oligomer and a prescribed amount of multifunctional (meth) acrylate monomer.

[0103] Antiviral Agents

[0104] Examples of the antiviral agent include organic antiviral agents and inorganic antiviral agents, and inorganic antiviral agents are preferred because of their high heat resistance, durability, and safety.

[0105] As organic antiviral agents, one or more selected from halogenated alkylthio antiviral agents, thiazole antiviral agents, benzimidazole antiviral agents, isophthalonitrile antiviral agents, phenol antiviral agents, triazine antiviral agents, bromine antiviral agents, quaternary ammonium salt antiviral agents, organometallic antiviral agents, organic iodine antiviral agents and pyridine antiviral agents can be cited.

[0106] Examples of inorganic antiviral agents include antiviral agents supported on or containing metal ions.

[0107] The metal ion is preferably any one of silver, zinc and copper, and more preferably silver.

[0108] As the carrier, inorganic compounds such as zeolite, apatite, glass, molybdenum, zirconium phosphate and titanium phosphate are preferred.

[0109] Zeolite is an aluminosilicate of an alkali metal or an alkaline earth metal, and any of natural zeolite and synthetic zeolite can be used. In addition, zeolite is classified into A type, faujasite type (X type, Y type), mordenite type, clinoptilolite type, etc. according to the crystal structure, and all of them can be used.

[0110] Apatite is a general term for minerals having a composition represented by the following general formula.

[0111] M 10 (ZO4)3X2

[0112] In the above formula, M represents Ca, Ba, Mg, Na, K, Fe, Al, etc., Z represents P, S, Si, As, etc., and X represents F, Cl, O, OH, etc. As a representative example corresponding to the above formula, fluoroapatite "Ca 10 (PO4)6F2" and hydroxyapatite "Ca 10 (PO4)6(OH)2”.

[0113] Examples of the glass include soda glass, borosilicate glass, lead glass, aluminosilicate glass, boric acid glass, and phosphate glass.

[0114] Examples of the zirconium phosphate include hexagonal zirconium phosphate.

[0115] As a method for making a carrier carry or contain metal ions, it is possible to appropriately select from a general method. Here, "containing metal ions" refers to keeping metal ions or substances capable of generating metal ions in a carrier in a certain form. In addition, "substances capable of generating metal ions" refers to, for example, substances that generate metal ions due to external factors or time factors, such as substances that generate metal ions by dissolving in water, etc.

[0116] Specific forms of support or inclusion include: a method of support by physical adsorption or chemical adsorption; a method of support by ion exchange; a method of support by a binder; a method of support by injecting a silver compound into a carrier; a method of support or inclusion by forming a thin layer of a silver compound on the surface of a carrier by a thin film forming method such as evaporation, dissolution reaction, sputtering, etc.; a method of ion exchange of a metal oxide such as glass at a high temperature; etc. Among the above forms, the method of support by ion exchange is preferred.

[0117] In order to improve processability and stabilize the antiviral effect, the antiviral agent is preferably in the form of particles. The particle shape may be spherical, elliptical, polyhedral, or scale-shaped, but is not particularly limited.

[0118] In order to easily prevent the antiviral agent from being buried in the resin layer, the average particle size of the antiviral agent is preferably 0.1 μm or more, more preferably 0.5 μm or more. In order to prevent the poor appearance and reduced scratch resistance caused by the antiviral agent being exposed from the resin layer, the average particle size of the antiviral agent is preferably 20 μm or less, more preferably 10 μm or less. It should be noted that even if the average particle size of the antiviral agent is large, if the thickness of the resin layer is increased, the exposure of the antiviral agent from the resin layer can be prevented. However, the thicker the resin layer, the lower the transparency of the optical film. Therefore, as described above, the average particle size of the antiviral agent is preferably 20 μm or less.

[0119] Examples of preferred ranges of the average particle size of the antiviral agent include 0.1 μm to 20 μm, 0.1 μm to 10 μm, 0.5 μm to 20 μm, and 0.5 μm to 10 μm.

[0120] In the present specification, the average particle size of the antiviral agent refers to the value measured by the following (1) to (3).

[0121] (1) The cross section of the film is photographed using a scanning transmission electron microscope (STEM). The acceleration voltage of the STEM is 10 kV to 30 kV, and the magnification is 50,000 to 300,000 times.

[0122] (2) Ten random antiviral agents are extracted from the observed image, and the particle size of each antiviral agent is calculated. The particle size of each antiviral agent is the distance between two random parallel straight lines that are the longest when the cross section of the antiviral agent is sandwiched between the two straight lines.

[0123] (3) The same operation is repeated five times for another observed image of the same sample, and the value obtained by the number average of 50 particle diameters is taken as the average particle diameter of the antiviral agent.

[0124] The content of the antiviral agent is preferably 1.0 parts by mass or more and 15.0 parts by mass or less relative to 100 parts by mass of the binder resin. By making the content of the antiviral agent 1.0 parts by mass or more, the antiviral property can be easily improved. By making the content of the antiviral agent 15.0 parts by mass or less, the reduction in visibility can be easily further suppressed.

[0125] Regarding the content of the antiviral agent, the lower limit is more preferably 2.0 parts by mass or more, further preferably 2.5 parts by mass or more, and further preferably 3.0 parts by mass or more, relative to 100 parts by mass of the binder resin, and the upper limit is more preferably 10.0 parts by mass or less, further preferably 8.0 parts by mass or less, and further preferably 7.0 parts by mass or less.

[0126] Matting Agent

[0127] The resin layer preferably contains a matting agent. When the resin layer contains a matting agent, the content of the antiviral agent can be suppressed and the Sdr of the surface of the resin layer can be easily adjusted to the above range.

[0128] The antiviral agent tends to have a high refractive index. When the antiviral agent is used alone to make Sdr within the above range without using a matting agent, the content of the antiviral agent increases, so the internal haze of the optical film tends to increase. If the internal haze of the optical film increases, the resolution of the display element tends to decrease. In order to suppress the increase in internal haze and easily make Sdr within the above range, the resin layer preferably contains a matting agent in addition to the antiviral agent.

[0129] Examples of the matting agent include organic matting agents and inorganic matting agents. The shape of the matting agent includes spheres, ellipsoids, polyhedrons, scales, etc., and is not particularly limited.

[0130] Examples of organic matting agents include matting agents containing one or more resins selected from polymethyl methacrylate, polyacrylic acid-styrene copolymers, melamine resins, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensates, silicones, fluorine-based resins, polyester-based resins, and the like.

[0131] Examples of the inorganic matting agent include matting agents containing one or more inorganic oxides selected from the group consisting of silica, alumina, zirconia, and titania.

[0132] In order to further suppress the reduction in visibility, the matting agent is preferably silica. Furthermore, among silicas, fumed silica is preferred because the size of the secondary particles can be easily adjusted.

[0133] Fumed silica refers to amorphous silicon dioxide made by a dry method, which can be obtained by reacting a volatile compound containing silicon in a gas phase. Specifically, materials generated by hydrolyzing silicon compounds such as silicon tetrachloride in a flame of oxygen and hydrogen, etc. can be cited. Fumed silica is suitable in that it is easy to hydrophobize the surface.

[0134] The inorganic matting agent is preferably subjected to a hydrophobic treatment on the surface. By subjecting the surface to a hydrophobic treatment, excessive aggregation of the inorganic matting agent can be suppressed.

[0135] Examples of the surface treatment agent for hydrophobic treatment include trimethylsilyl chloride, dimethyldichlorosilane, trimethylsilyl trifluoromethanesulfonate, chloromethyltrimethylsilane, hexamethyldisilazane, triethylsilane, triethylsilyl chloride, triisopropylsilyl chloride, tert-butyldimethylsilane, tert-butyldimethylsilyl chloride, octylsilane, hexadecylsilane, allyltrimethylsilane, trimethylvinylsilane, aminosilane, methacrylic silane, and polydimethylsiloxane.

[0136] The average primary particle size of the organic matting agent is preferably 1.0 μm to 6.0 μm, more preferably 2.0 μm to 4.0 μm. If the average primary particle size of the organic matting agent is increased, Sdr tends to increase. The organic matting agent is preferably contained in the resin layer in the form of primary particles.

[0137] In order to easily adjust Sdr to the above range, the average primary particle size of the inorganic matting agent is preferably from 5 nm to 50 nm, and more preferably from 7 nm to 30 nm.

[0138] In order to easily adjust Sdr to the above range, the inorganic matting agent is preferably contained in the resin layer in the form of secondary particles. The larger the secondary particle size of the inorganic matting agent, the larger the Sdr tends to be.

[0139] The average secondary particle size of the secondary particles of the inorganic matting agent is preferably 100 nm or more and 1 μm or less.

[0140] In this specification, the average particle size of the matting agent refers to the value measured by the following (1) to (3). When calculating the average primary particle size, in the following (2), the extracted particles are regarded as primary particles. When calculating the average secondary particle size, in the following (2), the extracted particles are regarded as secondary particles.

[0141] (1) A transmission observation image of the optical film is taken using an optical microscope at a magnification of 500 to 2000 times.

[0142] (2) Ten matting agents are randomly selected from the observed image, and the major and minor diameters of each matting agent are measured. The particle size of each particle is calculated from the average of the major and minor diameters. The major diameter is the longest diameter on the screen of each matting agent. The minor diameter is the distance between two points where a line segment orthogonal to the midpoint of the line segment constituting the major diameter intersects with the matting agent.

[0143] (3) The same operation is repeated five times on another observation image of the same sample, and the value obtained by the number average of 50 particle diameters is taken as the average particle diameter of the matting agent.

[0144] The content of the matting agent is preferably 5 parts by mass or more and 30 parts by mass or less relative to 100 parts by mass of the binder resin. By setting the content of the matting agent to be within the above range, Sdr can be easily set to be within the above range.

[0145] Regarding the content of the matting agent, the lower limit is more preferably 7 parts by mass or more, further preferably 9 parts by mass or more, and further preferably 10 parts by mass or more, and the upper limit is more preferably 27 parts by mass or less, further preferably 25 parts by mass or less, and further preferably 20 parts by mass or less, relative to 100 parts by mass of the binder resin.

[0146] The resin layer may contain additives such as an antioxidant, an ultraviolet absorber, and a light stabilizer within a range that does not inhibit the effects of the present disclosure.

[0147] "thickness"

[0148] In order to strike a balance between curl suppression, mechanical strength, hardness, and toughness, the thickness of the resin layer is preferably 2.0 μm to 10.0 μm, more preferably 3.0 μm to 9.0 μm, and further preferably 4.0 μm to 8.0 μm.

[0149] The thickness of the resin layer was calculated from the average value of 20 points selected from any part of a cross-sectional photograph of the optical film obtained by a scanning transmission electron microscope. The acceleration voltage of the STEM was 10 kV to 30 kV, and the magnification of the STEM was 1000 to 7000 times.

[0150] In this specification, a sample for taking a cross-sectional photograph of an optical film is prepared as follows.

[0151] The optical film cut into 2 mm×5 mm is placed in a silicone embedding plate, and epoxy resin is poured as the embedding resin to embed the entire optical film with the resin. The embedding resin is placed at 65° C. for more than 12 hours to solidify, and then an ultrathin slice is prepared by using an ultrathin slicer with a delivery thickness set to 100 nm. The prepared ultrathin slice is collected using a screen (150) with a collodion film as a sample for observation by a scanning transmission electron microscope (STEM).

[0152] If conduction is not achieved, it is sometimes difficult to see the observation image based on STEM, so Pt-Pd can be sputtered on the above sample for about 20 seconds. The sputtering time can be adjusted appropriately. 10 seconds is too short. At 100 seconds, the sputtered metal will become a granular foreign body image, so it is necessary to pay attention.

[0153] When the interface between the resin layer and the layer in contact with the resin layer is difficult to see, the sample may be stained with osmium tetroxide or the like.

[0154] Solvents

[0155] In order to adjust the viscosity or dissolve or disperse each component, the resin layer coating liquid preferably contains a solvent. Depending on the type of solvent, the surface shape of the resin layer after coating and drying is different, so it is preferred to select the solvent in consideration of the saturated vapor pressure of the solvent, the permeability of the solvent to the substrate, etc.

[0156] Specifically, the solvent may be exemplified by ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone (MIBK), cyclohexanone, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic hydrocarbons (cyclohexane, etc.), aromatic hydrocarbons (toluene, xylene, etc.), halogenated carbons (dichloromethane, dichloroethane, etc.), esters (methyl acetate, ethyl acetate, butyl acetate, etc.), alcohols (isopropyl alcohol, butanol, cyclohexanol, etc.), cellosolves (methyl cellosolve, ethyl cellosolve, etc.), glycol ethers (propylene glycol monomethyl ether acetate, etc.), cellosolve acetates, sulfoxides (dimethyl sulfoxide, etc.), amides (dimethylformamide, dimethylacetamide, etc.), etc., and a mixture thereof may also be used.

[0157] The solvent in the resin layer coating liquid preferably has a solvent with a fast evaporation rate as the main component. By accelerating the evaporation rate of the solvent, it is easy to suppress the antiviral agent and the matting agent from sinking to the bottom of the resin layer. Therefore, the content of the antiviral agent can be suppressed, and the Sdr can be easily made 1.0×10 -5 above.

[0158] The main component means that it accounts for 50% by mass or more of the total amount of the solvent, preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 85% by mass or more.

[0159] In this specification, a solvent with a high evaporation rate refers to a solvent having an evaporation rate of 100 or more when the evaporation rate of butyl acetate is 100. The evaporation rate of the solvent with a high evaporation rate is more preferably 120 or more and 300 or less, and further preferably 150 or more and 220 or less.

[0160] Examples of solvents having a fast evaporation rate include isopropyl alcohol (evaporation rate 150), methyl isobutyl ketone (evaporation rate 160), toluene (evaporation rate 200), and methyl ethyl ketone (evaporation rate 370).

[0161] On the other hand, examples of the slow evaporation rate solvent having an evaporation rate of less than 100 include cyclohexanone (evaporation rate 32) and propylene glycol monomethyl ether acetate (evaporation rate 44).

[0162] When forming the resin layer from the resin layer coating liquid, it is preferable to control the drying conditions.

[0163] The drying conditions can be controlled by the drying temperature and the wind speed in the dryer. The drying temperature is preferably 30°C to 120°C, and the drying wind speed is preferably 2m / s to 7m / s. In addition, in order to control the surface shape of the resin layer by drying, the irradiation of ionizing radiation is preferably performed after the coating liquid is dried.

[0164] <Base Material>

[0165] For ease of production of the optical film and ease of handling of the optical film, the optical film preferably has a substrate.

[0166] As the substrate, it is preferred to have light transmittance, smoothness and heat resistance, and further have excellent mechanical strength. As such a substrate, there can be mentioned plastic films such as polyester, triacetyl cellulose (TAC), cellulose diacetate, cellulose acetate butyrate, polyamide, polyimide, polyether sulfone, polysulfone, polypropylene, polymethylpentene, polyvinyl chloride, polyvinyl acetal, polyether ketone, polymethyl methacrylate, polycarbonate, polyurethane and amorphous olefin (Cyclo-Olefin-Polymer: COP). The substrate can be formed by laminating two or more plastic films.

[0167] Among plastic films, stretched polyester films are preferred for mechanical strength and dimensional stability, and biaxially stretched polyester films are more preferred. Examples of polyester films include polyethylene terephthalate films and polyethylene naphthalate films. TAC films and acrylic films are preferred because they are easy to improve light transmittance and optical isotropy. COP films and polyester films are preferred because they are excellent in weather resistance.

[0168] The thickness of the substrate is preferably from 5 μm to 300 μm, more preferably from 20 μm to 200 μm, and even more preferably from 30 μm to 120 μm.

[0169] When it is desired to thin the optical film, the upper limit of the thickness of the substrate is preferably 100 μm or less, and the upper limit is more preferably 80 μm or less. In addition, when the substrate is a low moisture permeability substrate such as polyester, COP, acrylic, etc., the upper limit of the thickness of the substrate used for thin filming is preferably 60 μm or less, and the upper limit is more preferably 40 μm or less. Even in the case of a large screen, if the upper limit of the thickness of the substrate is within the above range, it is also preferred from the aspect of being difficult to deform.

[0170] The thickness of the substrate was measured according to the following procedure.

[0171] (1) Use a contact-type film thickness measuring instrument to measure the total thickness of any 10 locations of the optical film. The average value of the thickness at the 10 locations is taken as the total thickness of the optical film. Examples of contact-type film thickness measuring instruments include a digital display standard outside micrometer (model: MDC-25SX) manufactured by Mitutoyo Corporation.

[0172] (2) The thickness of the substrate is calculated by subtracting the total thickness of the layers other than the substrate constituting the optical film from the layer thickness in (1) above. The thickness of the layers other than the substrate is calculated from a cross-sectional photograph of the optical film.

[0173] The total light transmittance of the substrate in accordance with JIS K7361-1:1997 is preferably 70% or more, more preferably 80% or more, and even more preferably 85% or more.

[0174] The haze of the substrate in accordance with JIS K7136:2000 is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less.

[0175] In order to improve the adhesiveness, the surface of the substrate may be subjected to a physical treatment such as a corona discharge treatment, or a chemical treatment. In addition, the substrate may have an easy-adhesion layer on the surface.

[0176] <Antiviral activity value>

[0177] The optical film of the present disclosure preferably has an antiviral activity value of 2.0 or more as measured in accordance with the antiviral test of ISO 21702:2019.

[0178] <Optical Characteristics>

[0179] In order to easily improve visibility, the total light transmittance of the optical film according to JIS K7361-1:1997 is preferably 85.0% or more, more preferably 87.0% or more, and even more preferably 89.0% or more.

[0180] In order to easily improve visibility, the haze of the optical film in JIS K7136:2000 is preferably 80.0% or less, more preferably 60.0% or less, further preferably 40.0% or less, and further preferably 30.0% or less.

[0181] The lower limit of the haze is not particularly limited, but is usually 1.0% or more.

[0182] In order to easily suppress a decrease in the resolution of a display element, the internal haze of the optical film is preferably 28.0% or less, more preferably 15.0% or less, and further preferably 10.0% or less. The lower limit of the internal haze is not particularly limited, but is usually 1.0% or more.

[0183] The internal haze of the optical film is measured according to the following procedure.

[0184] (1) A laminated body is prepared in which a transparent sheet is bonded to the resin layer side surface of an optical film via a transparent adhesive layer. The difference in refractive index between the binder resin of the resin layer and the adhesive of the transparent adhesive layer is within 0.05.

[0185] (2) The haze of the laminate prepared in the above (1) according to JIS K7136:2000 was measured, and the obtained value was defined as the internal haze of the optical film.

[0186] In order to improve visibility easily, the optical film preferably has a transmission image clarity of 2.5% or more at a comb width of 0.125 mm in JIS K7374:2007, more preferably 10% or more, and even more preferably 30% or more.

[0187] <Size, shape, etc.>

[0188] The optical film may be in the form of a single sheet cut into a predetermined size, or in the form of a roll in which a long strip is rolled up. The size of the single sheet is not particularly limited, and the maximum diameter is about 2 inches to 500 inches. The "maximum diameter" refers to the maximum length when any two points of the optical film are connected. For example, when the optical film is rectangular, the diagonal of the area becomes the maximum diameter. When the optical film is circular, the diameter of the circle becomes the maximum diameter.

[0189] The width and length of the roll are not particularly limited, and are generally 500 mm to 3000 mm in width and 500 m to 5000 m in length. The roll-shaped optical film can be cut into a single piece for use according to the size of the image display device, etc. When cutting, it is preferred to remove the end of the roll where the physical properties are unstable.

[0190] The shape of the single sheet is not particularly limited, and examples thereof include polygons such as triangles, quadrilaterals, and pentagons, circles, random irregular shapes, etc. More specifically, when the optical film is a quadrilateral, the aspect ratio is not particularly limited as long as there is no problem as a display screen.

[0191] [Image Display Panel]

[0192] The image display panel of the present disclosure comprises a display element and the antiviral optical film of the present disclosure disposed on the display element.

[0193] The antiviral optical film is disposed on the outermost surface of the image display panel, and is disposed so that the surface of the antiviral optical film on the resin layer side faces the opposite side to the display element.

[0194] Figure 2 is a schematic cross-sectional view of the cross-sectional shape of the image display panel 120 of the present disclosure. Figure 2 The image display panel 120 includes a display element 110 and an antiviral optical film 100 of the present disclosure disposed on the display element. Figure 2 In the embodiment, the antiviral optical film 100 is disposed on the outermost surface of the image display panel 120 , and the surface of the antiviral optical film 100 on the resin layer 20 side faces the opposite side to the display element 110 .

[0195] As display elements, there can be cited liquid crystal display elements, EL display elements (organic EL display elements, inorganic EL display elements), plasma display elements, etc., and further LED display elements such as micro LED display elements can be cited. These display elements can also have a touch panel function inside the display element.

[0196] As the display mode of the liquid crystal of the liquid crystal display element, IPS mode, VA mode, multi-domain mode, OCB mode, STN mode, TSTN mode, etc. can be cited. In the case where the display element is a liquid crystal display element, a backlight is required. The backlight is arranged on the side of the liquid crystal display element opposite to the side where the optical film is arranged.

[0197] In addition, the image display panel of the present disclosure may also be an image display panel with a touch panel having a touch panel between the display element and the optical film. In this case, the optical film is arranged on the outermost surface of the image display panel with the touch panel, and the surface of the resin layer side of the optical film is arranged in a manner facing the side opposite to the display element.

[0198] The size of the image display panel is not particularly limited, but the maximum diameter is about 2 inches to 500 inches. The maximum diameter refers to the maximum length when any two points in the surface of the image display panel are connected.

[0199] [Image display device]

[0200] The image display device of the present disclosure includes the image display panel of the present disclosure.

[0201] In the image display device, the antiviral optical film is disposed on the outermost surface of the image display device.

[0202] The image display device of the present disclosure preferably further includes a drive control unit electrically connected to the image display panel, and a housing that accommodates the image display panel, the drive control unit, and the like.

[0203] When the display element is a liquid crystal display element, the image display device of the present disclosure requires a backlight. The backlight is arranged on the side of the liquid crystal display element opposite to the light emitting surface side.

[0204] The size of the image display device is not particularly limited, but the maximum diameter of the effective display area is about 2 inches to 500 inches.

[0205] The effective display area of ​​the image display device is an area where an image can be displayed. For example, when the image display device has a casing surrounding a display element, the area inside the casing becomes the effective image area.

[0206] It should be noted that the maximum diameter of the effective image area refers to the maximum length when connecting any two points in the effective image area. For example, when the effective image area is a rectangle, the diagonal of the area becomes the maximum diameter. In addition, when the effective image area is a circle, the diameter of the area is the maximum diameter.

[0207] Example

[0208] Next, the present disclosure will be described in more detail by way of examples, but the present disclosure is not limited to these examples. It should be noted that, unless otherwise specified, "parts" and "%" are based on mass.

[0209] 1. Measurement and evaluation

[0210] The optical films of the embodiments and comparative examples were measured and evaluated as follows. The atmosphere during each measurement and evaluation was set to a temperature of 23±5°C and a relative humidity of 40% to 65%. In addition, before each measurement and evaluation, the object sample was exposed to the above atmosphere for 30 minutes to 60 minutes before measurement and evaluation. Among them, the antiviral property was measured in accordance with ISO regulations. The results are shown in Table 1.

[0211] 1-1. Measurement of surface shape

[0212] The optical films of the examples and comparative examples were cut into 10 cm × 10 cm. The cutting site was selected from random sites after visually confirming that there were no abnormal points such as dust and damage. The substrate side of the cut optical film was bonded to a glass plate (thickness 2.0 mm) of 10 cm long × 10 cm wide by an optically transparent adhesive sheet (trade name: Panaclean PD-S1, thickness 25 μm) from Panac to prepare sample 1.

[0213] Using a confocal laser microscope (VK-X250 (control unit), VK-X260 (measurement unit)) from KEYENCE, the surface shape of the anti-glare film was measured and analyzed under the following measurement condition 1, image processing condition 1, and analysis condition 1, after the sample 1 was fixed and closely attached to the measurement stage. It should be noted that the analysis software used was a multi-file analysis application (version 1.3.1.120).

[0214] (Measurement Condition 1)

[0215] Laser wavelength: 408nm

[0216] Optical system for measurement: Confocal optical system

[0217] Objective lens: 150 times

[0218] Zoom: 1x

[0219] Measurement area: 93.95μm×70.44μm

[0220] Number of measurement points: 1024 x 768 points

[0221] Measurement conditions: Transparent surface shape / high precision / double scanning

[0222] (Image processing condition 1)

[0223] DCL / BCL: DCL=13000, BCL=65535, processing method: supplement from surrounding pixels

[0224] Height cut-off level: Strong

[0225] (Analysis Condition 1)

[0226] Region: The entire region

[0227] Filter type: Gaussian

[0228] S-filter: 0.25μm

[0229] F-operation: plane tilt correction (area designation)

[0230] L-Filter: No

[0231] Terminal effect correction: ON

[0232] · s when calculating Sal: s = 0.20

[0233] "Sdr", "Sa", "Sal" and "Spc" of each measurement area are displayed as measurement values ​​by the analysis software.

[0234] 1-2. Total light transmittance and haze

[0235] The optical films of the examples and comparative examples were cut into 10 cm squares. The cut locations were selected from random locations after visually confirming that there were no abnormalities such as dust or damage. The total light transmittance of each sample according to JIS K7361-1:1997 and the haze of JIS K7136:2000 were measured using a haze meter (HM-150, manufactured by Murakami Color Research Laboratory).

[0236] In order to stabilize the light source, wait for more than 15 minutes after turning on the power switch of the device, calibrate without setting any parts at the entrance opening, and then set the measurement sample at the entrance opening for measurement. The light incident surface is the substrate side.

[0237] A TAC film (manufactured by Fujifilm Corporation, TD80UL) with a thickness of 80 μm was attached to the resin layer side of the optical film of the examples and comparative examples by means of a transparent adhesive (manufactured by Panac, PD-S1, thickness 25 μm) to prepare a laminate. The haze of the laminate according to JIS K7136:2000 was measured, and the obtained value was taken as the internal haze of the optical film.

[0238] 1-3. Transmission image clarity

[0239] The optical films of the embodiments and comparative examples were cut into 10 cm squares. The cut locations were selected from random locations after visually confirming that there were no abnormalities such as dust and damage. The image clarity of each sample was measured at a light comb width of 0.125 mm in accordance with JIS K7374:2007 using an imaging measuring instrument (trade name: ICM-1T) manufactured by Suga Testing Instruments Co., Ltd. The light incident surface was the coated surface side.

[0240] 1-4. Antiviral properties

[0241] The antiviral activity values ​​of the optical films of the examples and comparative examples were measured according to the antiviral test of ISO 21702:2019. The viruses used were H3N2 influenza virus and feline calicivirus. The antiviral activity value of 2.0 or more was considered a pass level. The pass level was scored as "A" and the fail level was scored as "C".

[0242] 1-5. Visibility

[0243] A commercially available image display device (Apple Inc.'s product name "iPad (registered trademark) MGLW2J / A") was made to display white. The brightness of the image display device was adjusted to 300 cd / m using a Konica Minolta colorimeter (product name: CS-150). 2 .

[0244] The optical films of the examples and comparative examples were cut into 10 cm × 10 cm pieces. The cut parts were selected from random parts after visually confirming that there were no abnormal points such as dust and damage. The substrate side of the cut optical film was attached to an image display device with adjusted brightness using an optically transparent adhesive sheet (trade name: Panaclean PD-S1) from Panac to prepare sample 2.

[0245] In a bright room environment (illuminance on sample 2 is 500 lux or more and 1000 lux or less), the brightness of the portion of sample 2 bonded with the optical film and the portion of sample 2 not bonded with the optical film were visually compared and evaluated according to the following criteria. The observer was 50 cm away from sample 2 in the normal direction. The observers were 20 healthy people with a visual acuity of 0.7 or more. In addition, the specific situation of the 20 people was 5 people in each age group from their twenties to their fifties.

[0246] <Evaluation Criteria>

[0247] A: The number of observers who answered that they did not notice a decrease in brightness at the portion where the optical film was applied compared to the portion where the optical film was not applied was 14 or more

[0248] B: The number of observers who answered that they did not notice the decrease in brightness was between 7 and 13.

[0249] C: The number of observers who answered that they did not notice the decrease in brightness was less than 6

[0250] 2. Production of optical films

[0251] [Example 1]

[0252] The following resin layer coating liquid 1 was applied on a transparent substrate (80 μm thick triacetyl cellulose resin film, Fujifilm Corporation, TD80UL). Then, it was dried at 70°C and a wind speed of 5 m / s for 30 seconds. Then, it was heated in a nitrogen atmosphere with an oxygen concentration of 200 ppm or less at a cumulative light intensity of 100 mJ / cm 2 The resin layer was irradiated with ultraviolet rays in a manner of 6.0 μm thick to obtain the optical film of Example 1.

[0253] <Resin layer coating liquid 1>

[0254] · Pentaerythritol triacrylate 75 parts

[0255] (Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30)

[0256] · 10 parts of a mixture of ethoxylated isocyanuric acid diacrylate and ethoxylated isocyanuric acid triacrylate (Toagosei Co., Ltd., trade name: M-313)

[0257] · Urethane acrylate oligomer 15 parts

[0258] (DIC Corporation, trade name: UNIDIC V-4000BA, number average molecular weight: 877)

[0259] 7 parts of inorganic antiviral agent

[0260] (Antiviral agent in which silver ions are supported on hexagonal zirconium phosphate by ion exchange)

[0261] (Toagosei Co., Ltd., trade name: NOVARON AG300, average particle size 1.0 μm)

[0262] ·Inorganic matting agent 10 parts

[0263] (Silica particles with hydrophobic surface treatment, average primary particle size 12nm)

[0264] (Japan AEROSIL Co., Ltd., fumed silica)

[0265] · 4 parts of photopolymerization initiator

[0266] (IGM Resins BV, trade name: Omnirad184)

[0267] ·0.15 parts of silicone leveling agent

[0268] (Momentive Performance Materials, trade name: TSF4460)

[0269] Solvent (toluene) 155 parts

[0270] Solvent (cyclohexanone) 25 parts

[0271] Solvent (isopropanol) 45 parts

[0272] [Example 2]

[0273] Resin layer coating liquid 2 was prepared with the following changes made to the resin layer coating liquid 1. An optical film of Example 2 was obtained in the same manner as in Example 1 except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 2.

[0274] <Changes in Resin Layer Coating Liquid 2>

[0275] The content of antiviral agent was changed from 7 parts to 5 parts.

[0276] The content of inorganic matting agent was changed from 10 parts to 6 parts.

[0277] · 14 parts of an organic matting agent was added. The organic matting agent used was a spherical polyacrylic acid-styrene copolymer with an average particle size of 3.0 μm produced by Sekisui Chemicals Co., Ltd.

[0278] [Example 3]

[0279] Resin layer coating liquid 3 was prepared with the following changes made to the resin layer coating liquid 1. An optical film of Example 3 was obtained in the same manner as in Example 1 except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 3.

[0280] <Changes in Resin Layer Coating Liquid 3>

[0281] The content of the inorganic matting agent was changed from 10 parts to 0 parts (changed to a formulation containing no inorganic matting agent).

[0282] · 25 parts of an organic matting agent was added. The organic matting agent used was a spherical polyacrylic acid-styrene copolymer with an average particle size of 3.0 μm produced by Sekisui Chemicals Co., Ltd.

[0283] [Comparative Example 1]

[0284] Resin layer coating liquid 4 was prepared with the following changes made to the resin layer coating liquid 1. An optical film of Comparative Example 1 was obtained in the same manner as in Example 1 except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 4.

[0285] <Changes in Resin Layer Coating Liquid 4>

[0286] The content of the inorganic matting agent was changed from 10 parts to 0 parts (changed to a formulation containing no inorganic matting agent).

[0287] [Comparative Example 2]

[0288] Resin layer coating liquid 5 was prepared with the following changes made to the resin layer coating liquid 1. An optical film of Comparative Example 2 was obtained in the same manner as in Example 1 except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 5.

[0289] <Changes in Resin Layer Coating Liquid 5>

[0290] The content of antiviral agent was changed from 7 parts to 10 parts.

[0291] The content of the inorganic matting agent was changed from 10 parts to 0 parts (changed to a formulation containing no inorganic matting agent).

[0292] · Add 3 parts of organic matting agent. The organic matting agent used was a spherical polyacrylic acid-styrene copolymer with an average particle size of 3.0 μm from Sekisui Chemicals Co., Ltd.

[0293] [Comparative Example 3]

[0294] Resin layer coating liquid 6 was prepared with the following changes made to the resin layer coating liquid 1. An optical film of Comparative Example 3 was obtained in the same manner as in Example 1 except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 6.

[0295] <Changes in Resin Layer Coating Liquid 6>

[0296] The content of antiviral agent was changed from 7 parts to 20 parts.

[0297] The content of the inorganic matting agent was changed from 10 parts to 0 parts (changed to a formulation containing no inorganic matting agent).

[0298] [Comparative Example 4]

[0299] Resin layer coating liquid 7 was prepared with the following changes made to the resin layer coating liquid 1. An optical film of Comparative Example 4 was obtained in the same manner as in Example 1 except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 7.

[0300] <Changes in Resin Layer Coating Liquid 7>

[0301] The content of antiviral agent was changed from 7 parts to 3 parts.

[0302] The content of inorganic matting agent was changed from 10 parts to 20 parts.

[0303] · 25 parts of an organic matting agent was added. The organic matting agent used was a spherical polyacrylic acid-styrene copolymer with an average particle size of 3.0 μm produced by Sekisui Chemicals Co., Ltd.

[0304] [Comparative Example 5]

[0305] Resin layer coating liquid 8 was prepared with the following changes made to the resin layer coating liquid 1. An optical film of Comparative Example 5 was obtained in the same manner as in Example 1 except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 8.

[0306] <Changes in Resin Layer Coating Liquid 8>

[0307] The content of antiviral agent was changed from 7 parts to 5 parts.

[0308] The content of inorganic matting agent was changed from 10 parts to 3 parts.

[0309] [Example 4]

[0310] Resin layer coating liquid 9 was prepared with the following changes made to the resin layer coating liquid 1. An optical film of Example 4 was obtained in the same manner as in Example 1 except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 9.

[0311] <Changes in Resin Layer Coating Liquid 9>

[0312] The inorganic antiviral agent was changed to an organic antiviral agent, and the content of the antiviral agent was changed from 7 parts to 3 parts. The organic antiviral agent used was "SLAMONIE D100" manufactured by Osaka Gas Chemicals Co., Ltd.

[0313] The content of inorganic matting agent was changed from 10 parts to 8 parts.

[0314] · 10 parts of an organic matting agent was added. The organic matting agent used was a spherical polyacrylic acid-styrene copolymer with an average particle size of 3.0 μm produced by Sekisui Chemicals Co., Ltd.

[0315] [Example 5]

[0316] A resin layer coating liquid 10 was prepared with the following changes made to the resin layer coating liquid 1. Except that the resin layer coating liquid 1 was changed to the resin layer coating liquid 10, an optical film of Example 5 was obtained in the same manner as in Example 1.

[0317] <Changes in the Resin Layer Coating Liquid 10>

[0318] The inorganic antiviral agent was changed to an organic antiviral agent, and the content of the antiviral agent was changed from 7 parts to 5 parts. The organic antiviral agent used was "SLAMONIE D100" manufactured by Osaka Gas Chemicals Co., Ltd.

[0319] The content of inorganic matting agent was changed from 10 parts to 8 parts.

[0320] · 8 parts of an organic matting agent was added. The organic matting agent used was a spherical polyacrylic acid-styrene copolymer with an average particle size of 3.0 μm produced by Sekisui Chemicals Co., Ltd.

[0321] [Table 1]

[0322]

[0323] From the results in Table 1, it was confirmed that the optical films of Examples were able to improve antiviral properties while suppressing a decrease in visibility.

[0324] Explanation of symbols

[0325] 10: Base material

[0326] 20: Resin layer

[0327] 21: Binder resin

[0328] 22: Antiviral Agents

[0329] 23: Matting agent

[0330] 100: Antiviral optical film

[0331] 110: Display components

[0332] 120: Image display panel

Claims

1. An antiviral optical film, wherein: The optical film has a resin layer containing a binder resin and an antiviral agent on at least one surface, The surface of the resin layer has an interface development area ratio (Sdr) of 1.0×10 -5 Above 1.5×10 -1 the following.

2. The antiviral optical film according to claim 1, wherein: The content of the antiviral agent is 1.0 part by mass or more and 15.0 parts by mass or less based on 100 parts by mass of the binder resin.

3. The antiviral optical film according to claim 1 or 2, wherein: The antiviral agent is an inorganic antiviral agent.

4. The antiviral optical film according to claim 1 or 2, wherein: The binder resin includes a cured product of an ionizing radiation curable resin composition.

5. The antiviral optical film according to claim 1 or 2, wherein: The resin layer further includes a matting agent.

6. The antiviral optical film according to claim 1 or 2, wherein: The optical film includes a substrate and the resin layer formed on one surface of the substrate.

7. The antiviral optical film according to claim 1 or 2, wherein: The total light transmittance of JIS K7361-1:1997 is 85.0% or more.

8. The antiviral optical film according to claim 1 or 2, wherein: The haze according to JIS K7136:2000 is 80.0% or less.

9. An image display panel, wherein: The image display panel comprises a display element and the antiviral optical film according to claim 1 or 2 disposed on the display element. The antiviral optical film is disposed on the outermost surface of the image display panel, and is disposed so that the surface of the antiviral optical film on the resin layer side faces the opposite side to the display element. 10 . An image display device comprising the image display panel according to claim 9 .

Images