Light-transmitting plate and optical component

Abstract

To provide a light-transmissive plate that has excellent antimicrobial properties and also has excellent strength, and an optical component that includes the light-transmissive plate and has excellent reliability.SOLUTION: The inventive light-transmissive plate 10 has optical transparency and allows the entrance of incident light and the exit of outgoing light from both sides of it. The light-transmissive plate 10 includes a tabular substrate 12, and a resin layer 11 laminated on one side and / or the other side of the substrate 12. The resin layer 11 includes antimicrobial particles that are partly exposed from the surface of the resin layer 11 remote from the substrate 12. When 500 g of a weight is dropped onto the light-transmissive plate 10 with a Dupont impact tester in accordance with JIS K 5600-5-3, the maximum of dropping height at which the weight does not penetrate the light-transmissive plate is 120 cm or longer.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a light transmissive plate and an optical component.

Background Art

[0002] In recent years, a pandemic in which infectious diseases mediated by pathogens such as viruses and bacteria rapidly spread has become a major social problem.

[0003] In order to prevent the spread and adhesion of droplets from the wearer to a third party, or the spread and adhesion of droplets from a third party to the wearer, for the purpose of preventing the infection of these infectious diseases between people, wearing a face shield that covers the front of the wearer's head, a transparent mask that covers the wearer's mouth, protective glasses that cover the wearer's eyes, etc., or arranging a transparent arrangement tool having transparency between people, etc., it has been proposed to prevent the spread and adhesion of droplets using various optical components (for example, see Patent Document 1).

[0004] In order to prevent or suppress contact infection caused by a person coming into contact with droplets adhering to these optical components, the light transmissive plate provided in the optical component is formed on the surface of a substrate having light transmissivity with a resin layer containing antimicrobial particles having antimicrobial properties such as antiviral properties and antibacterial properties. It is conceivable to have a configuration.

[0005] In a light transmissive plate having such a configuration, even if a resin layer covering the surface is formed on a substrate having light transmissivity, it is required that excellent strength be imparted to the light transmissive plate (especially the resin layer), but the fact is that sufficient strength has not been obtained.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] An object of the present invention is to provide a light-transmitting plate having antimicrobial properties and excellent strength, and an optical component including such a light-transmitting plate and having excellent reliability.

Means for Solving the Problems

[0008] Such an object is achieved by the present invention described in the following (1) to ( 9 ). (1) A light-transmitting plate having light-transmitting properties that allow the incidence of incident light and the emission of emitted light from both surfaces, comprising a flat substrate and a resin layer laminated on at least one side of one surface side and the other surface side of the substrate, a part of the resin layer is exposed from the surface opposite to the substrate and contains antimicrobial particles having antimicrobial properties, the substrate has an average thickness of 0.1 mm or more and 3.0 mm or less, the resin layer has an average thickness of 3.0 μm or more 40.0 μm or less, when the light-transmitting plate is dropped with a 500 g weight using a DuPont impact tester conforming to JIS K 5600-5-3, the maximum height at which the light-transmitting plate is not penetrated is 120 cm or more and the antimicrobial particles mainly contain inorganic materials, the inorganic materials include silver molybdate, the average particle diameter of the antimicrobial particles is 0.5 μm or more and 8.5 μm or less A light-transmitting plate characterized by the above.

[0009] (2) The light-transmitting plate according to (1) above, wherein the light-transmitting plate has a parallel light transmittance of 15% or more as defined in JIS K 7136 and JIS K 7361.

[0010] (3) The light-transmitting plate according to (1) or (2) above, wherein the haze value measured in accordance with JIS K 7136 is 80% or less.

[0011] (4) The light-transmitting plate according to any one of (1) to (3) above, wherein the resin layer further contains a binder resin that holds the antimicrobial particles.

[0012] (5) The light-transmitting plate according to (4) above, wherein the binder resin is at least one of a polycarbonate resin, a polyester resin, and an acrylic resin.

[0015] ( 6 ) The antimicrobial particles have a content of 0.4% by weight or more and 7.5% by weight or less in the resin layer in the above ( 1 ) or any one of (5) The light-transmitting plate according to.

[0020] ( 7 ) The substrate is composed mainly of at least one of a polycarbonate resin, a polyester resin, and an acrylic resin, and is the light-transmitting plate according to any one of (1) to ( 6 ) above.

[0021] ( 8 ) The light-transmitting plate is a partition member that partitions a first space and a second space, and is the light-transmitting plate according to any one of (1) to ( 7 ) above.

[0022] ( 9 ) An optical component comprising the light-transmitting plate according to any one of (1) to ( 8 ) above.

Advantages of the Invention

[0023] According to the present invention, it can be said that the light-transmitting plate has antimicrobial properties and excellent strength. As a result, the optical component including this light-transmitting plate has excellent reliability.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0025] Hereinafter, the light transmission plate and the optical component of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

[0026] The light transmission plate of the present invention has light transmissibility that allows the incidence of incident light from both surfaces and the emission of emitted light, and includes a flat substrate and a resin layer laminated on at least one side of one surface side and the other surface side of the substrate. The resin layer has a part exposed from the surface on the side opposite to the substrate and contains antimicrobial particles having antimicrobial properties. When a 500 g weight is dropped using a DuPont impact tester conforming to JIS K 5600-5-3, the light transmission plate is characterized in that the maximum height at which the light transmission plate is not penetrated is 120 cm or more.

[0027] By configuring the light transmission plate to have such a structure, that is, in the resin layer, since a part of the antimicrobial particles is exposed from the resin layer, the light transmission plate exhibits antimicrobial properties. And when a 500 g weight is dropped using a DuPont impact tester conforming to JIS K 5600-5-3, the light transmission plate satisfies the condition that the maximum height at which the light transmission plate is not penetrated is 120 cm or more. Therefore, it can be said that this light transmission plate has excellent strength. Thus, by using this light transmission plate in a light-transmitting part where light transmissibility is required in an optical component worn by a person, such as a face shield that covers the front of the wearer's head, a transparent mask that covers the wearer's mouth, and protective glasses that cover the wearer's eyes, or an optical component arranged between people, such as a transparent fixture (partition board), the optical component can have excellent reliability.

[0028] <Light transmission plate> FIG. 1 is a longitudinal sectional view showing an embodiment of the light transmission plate of the present invention, and FIG. 2 is a partial enlarged longitudinal sectional view showing an enlarged view of part A of the light transmission plate shown in FIG. 1. In the following description, the upper side in FIG. 1 is referred to as "upper" and the lower side as "lower". Also, the drawings used are appropriately enlarged or reduced and displayed so that the part to be described can be recognized. In addition, in FIG. 2, hatching is omitted in the figure for easy viewing.

[0029] As shown in FIG. 1, in this embodiment, the light transmission plate 10 includes a flat substrate 12 and resin layers 11 laminated on both the one surface side and the other surface side of the substrate 12. Hereinafter, each part constituting the light transmission plate 10 will be described.

[0030] The substrate 12 is a flat plate having light transmissibility. By arranging the light transmission plate 10 between the first space and the second space, it partitions between these spaces, and thereby has a function of preventing the diffusion of droplets between the first space and the second space.

[0031] Further, by forming the light transmission plate 10 as a multilayer body (laminated body) including the substrate 12 and the resin layers 11 laminated on both surfaces of the substrate 12, and configuring the substrate 12 not to contain antimicrobial properties, the transparency of the entire light transmission plate 10 can be improved, and the cost of the light transmission plate 10 can be reduced.

[0032] As shown in FIG. 1, the substrate 12 (light transmission plate 10) has a flat plate shape, but depending on its use and the like, it may be used as it is in a planar shape or used in a curved shape.

[0033] This substrate 12 is not particularly limited as long as it can set the maximum height, which is measured using a DuPont impact tester conforming to JIS K 5600-5-3, to 120 cm or more with the light-transmitting plate 10 having light transmissivity. Preferably, it is composed mainly of a transparent resin having thermoplasticity. Thereby, the functions of the substrate 12 as described above can be imparted to the substrate 12. As described above, by mainly configuring the substrate 12 with a transparent resin having thermoplasticity, it can be made excellent in toughness compared to the case of being composed of a transparent resin having thermosetting properties, for example. Therefore, it becomes possible to set the maximum height to 120 cm or more relatively easily.

[0034] Examples of this transparent resin include acrylic resins, polystyrene resins, polyethylene resins, polypropylene resins, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polycarbonate resins, cycloolefin resins, vinyl chloride resins, and polyacetal resins, etc., which have transparency. One or a combination of two or more of these can be used. Among these, at least one of polycarbonate resins, polyester resins, and acrylic resins is preferable. These resins are relatively rich in mechanical strengths such as transparency (light transmittance) and toughness, and also have high heat resistance. Therefore, by using these resins for the transparent resin, the transparency of the substrate 12, the impact resistance, and the heat resistance of the substrate 12 can be improved relatively easily. That is, the light-transmitting plate 10 can be made to have excellent light transmissivity and satisfy that the maximum height measured using a DuPont impact tester conforming to JIS K 5600-5-3 is surely 120 cm or more.

[0035] In addition, the substrate 12 may further contain various additives such as antioxidants, fillers, plasticizers, light stabilizers, ultraviolet absorbers, heat ray absorbers, and flame retardants, if necessary, in addition to the above-described transparent resin.

[0036] The thickness of the substrate 12 is appropriately set according to the use of the light transmission plate 10. The average thickness of the substrate 12 is preferably about 0.05 mm or more and 30.0 mm or less, more preferably about 0.1 mm or more and 5.0 mm or less. By setting the average thickness of the substrate 12 within such a range, the strength that can be used as the light transmission plate 10 is imparted, and when the light transmission plate 10 is disposed between the first space and the second space, the diffusion of droplets between these spaces can be surely prevented.

[0037] As shown in FIG. 1, in the present embodiment, the resin layer 11 is laminated on both surface sides of the substrate 12, and is a layer containing antimicrobial particles 31 having antimicrobial properties, a part of which is exposed from the surface opposite to the substrate 12 (see FIG. 2).

[0038] A part of the antimicrobial particles 31 is exposed from the surface of the resin layer 11 opposite to the substrate 12, whereby the resin layer 11 (light transmission plate 10) can exhibit antimicrobial properties.

[0039] Also, as described above, the light transmission plate 10 is formed as a multilayer body (laminated body) including the substrate 12 and the resin layers 11 laminated on both surfaces of the substrate 12, and the resin layer 11 is configured to contain antimicrobial properties alone, whereby the transparency of the entire light transmission plate 10 can be improved and the cost of the light transmission plate 10 can be reduced.

[0040] In addition to the antimicrobial particles 31, the resin layer 11 contains a binder resin 21 that holds the antimicrobial particles 31 in the resin layer 11. Thereby, the resin layer 11 containing the antimicrobial particles 31 can be formed into a layered film as shown in FIGS. 1 and 2.

[0041] As for this binder resin 21, the light-transmitting plate 10 is not particularly limited as long as it has light-transmittance and can have the maximum height measured using a DuPont impact tester conforming to JIS K 5600-5-3 set to 120 cm or more. For example, the thermoplastic transparent resin described for the substrate 12 is preferably used. Thus, by using a thermoplastic transparent resin as the binder resin 21, the resin layer 11 can be made to have excellent toughness as compared with the case of using a thermosetting transparent resin, for example. Therefore, the maximum height can be set to 120 cm or more relatively easily. Accordingly, it can be said that the light-transmitting plate 10 provided with this resin layer 11 has excellent strength. Also, in the resin layer 11, the antimicrobial particles 31 can be held by the binder resin 21 with excellent retention. Therefore, it is possible to accurately suppress or prevent the unintended detachment of the antimicrobial particles 31 from the resin layer 11 at an early stage.

[0042] Among the above, the binder resin 21 is more preferably at least one of a polycarbonate resin, a polyester resin, and an acrylic resin. As described above, these resins are relatively rich in mechanical strengths such as transparency (light transmittance) and toughness, and also have high heat resistance. Therefore, by using these resins for the binder resin, the transparency of the resin layer 11, the impact resistance, and the heat resistance of the resin layer 11 can be relatively easily improved. Accordingly, even if the light-transmitting plate 10 is configured as a laminate in which the resin layer 11 is laminated on the surfaces (both the upper and lower surfaces) of the substrate 12, the light-transmitting plate 10 can have excellent light transmittance and satisfy that the maximum height measured using a DuPont impact tester conforming to JIS K 5600-5-3 is surely 120 cm or more.

[0043] Further, it is preferable that this binder resin 21 is the same as or of the same kind as the transparent resin contained in the substrate 12. Thereby, the resin layer 11 can exhibit excellent adhesion to the substrate 12. Therefore, even when stress is applied to the light transmission plate 10, it is possible to accurately suppress or prevent peeling between the resin layer 11 and the substrate 12. Further, at the interface between the resin layer 11 and the substrate 12, it is possible to accurately suppress or prevent light transmitted through the light transmission plate 10 from being reflected, and this light can be surely transmitted between the resin layer 11 and the substrate 12.

[0044] A part of the antimicrobial particles 31 is exposed from the surface of the resin layer 11 on the side opposite to the substrate 12. Thereby, the resin layer 11 (light transmission plate 10) exhibits antimicrobial properties.

[0045] Here, in this specification, the term "antimicrobial property" is a concept including antibacterial property, antiviral property, and antifungal property (mildew-proof property). The antimicrobial particles 31 include antibacterial particles, antiviral particles, and antifungal (mildew-proof) particles. The antimicrobial particles 31 include those containing an antibacterial material, an antiviral material, and an antifungal (mildew-proof) material as antimicrobial materials.

[0046] This antimicrobial material is not particularly limited as long as it has antimicrobial properties, and it may be either an inorganic material or an organic material having antimicrobial properties.

[0047] As the inorganic material having antimicrobial properties, for example, at least one metal among silver, copper, zinc, and platinum, or a metal oxide, metal hydrate, or metal compound containing this metal can be preferably used. Thereby, in the resin layer 11 where a part of the antimicrobial particles 31 is exposed, the antimicrobial property can be surely exhibited.

[0048] In addition, among inorganic materials, examples of metal compounds include metal carboxylates, metal oxide catalysts supporting metals or metal oxides, inorganic particles (carriers) such as zeolites ion-exchanged with metal ions, and copper complexes, etc. Among them, ion-exchanged inorganic particles are preferably used. Since such inorganic particles exhibit excellent antimicrobial properties, they can be preferably used as the antimicrobial particles 31.

[0049] In addition, when using a metal as the inorganic material, the antimicrobial particles 31 may contain metal particles composed of a single metal such as silver, copper, zinc, or platinum, or may contain two or more of the above metal particles, or may further contain metal particles composed of an alloy containing two or more metals.

[0050] Examples of metal oxides or metal hydrates include copper(II) oxide, copper(I) oxide (cuprous oxide), copper(II) hydroxide, copper(II) carbonate, etc.

[0051] Examples of metal carboxylates include copper(II) acetate, copper(I) acetate, copper(I) oxalate, copper(II) oxalate, copper(II) phthalate, etc.

[0052] Examples of metal oxide catalysts supporting metals or metal oxides include those obtained by supporting metals such as platinum, silver, and copper on titanium oxide, tungsten oxide, etc., such as platinum-supported titania catalysts, silver-supported titania catalysts, platinum-supported nitrogen-doped titania catalysts, platinum-supported sulfur-doped titania catalysts, silver-supported tungsten oxide catalysts, etc.

[0053] Furthermore, examples of the inorganic particles (carriers) ion-exchanged with metal ions include zeolite exchanged with at least one of silver ions and copper ions, alumina supporting at least one of silver and copper, silica supporting at least one of silver and copper, titanium oxide supporting at least one of silver and copper, or tungsten oxide, calcium phosphate supporting at least one of silver and copper, or zirconium phosphate, molybdic acid supporting at least one of silver and copper, and the like.

[0054] Examples of the copper complex include a complex of acetylacetone and copper, copper(I)(1-butanethiolate), copper(I)(hexafluoropentanedionato cyclooctadiene), and the like.

[0055] Examples of the organic-based material having antimicrobial properties include aliphatic ones and aromatic ones.

[0056] Examples of aliphatic organic materials include monohydric alcohols, dihydric alcohol derivatives, saturated aldehydes, saturated monocarboxylic acids, unsaturated monocarboxylic acids, organotin compounds, cyclopentane derivatives, halogen derivatives, unsaturated ethers, lactones, quaternary ammonium salts, secondary amines, amino acid derivatives, sulfonic acid derivatives, hydroxamic acid derivatives, cyanuric acid derivatives, cyanic acid derivatives, sulfone derivatives, thiocarbamide derivatives, guanidine derivatives, phosphate esters, fatty acid monoglycerides, hydantoin, dithiols, arsine derivatives, etc. Specifically, for example, 2-n-octyl-4-isothiazolin-3-one, hexahydro-1,3,5-tris(2-hydroxyethyl)-S-triazine, hexahydro-1,3,5-triethyl-S-triazine, 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyridine, 4,4’-(tetramethylenedicarbonyl diamino)bis(1-decylpyridinium bromide), alkyldi(aminoethyl)glycine, bronopol, 3-iodo-2-propynyl carbamate, 2-bromo-2-nitro-1,3-propanediol, 1,2-dibromo-2,4-dicyanobutane, cetylpyridinium chloride, 10,10-oxybisphenoxyarsine, etc.

[0057] Examples of the aromatic organic material include carbonates, quaternary ammonium salts, monoamine derivatives, diamine derivatives, nitrile derivatives, hydroxylamine derivatives, anilide derivatives, imidazole derivatives, benzothiazole derivatives, isothiazole derivatives, thiadiazole derivatives, triazine derivatives, guanidine derivatives, pyridine derivatives, pyrazolopyrimidine derivatives, benzofuran derivatives, monocyclic hydrocarbon derivatives, halogenobenzene derivatives, benzenecarboxylic acid derivatives, mercaptocarboxylic acid derivatives, hydroxycarboxylic acid derivatives, monohydric phenol derivatives, dihydric phenol derivatives, phenol ether derivatives, phenol ester derivatives, halogenophenol derivatives, sulfone derivatives, benzenesulfonic acid derivatives, phenyl derivatives, biphenyl, monohydric naphthol, naphthalene derivatives, pyrrole derivatives, quinone derivatives, quinoline derivatives, isoquinoline derivatives, organic phosphate ester derivatives, etc. Specific examples include diiodomethyl-p-trisulfone, 1-chlorophenyl-3-iodopropargyl formal, benzalkonium chloride, chlorhexidine gluconate, 4-isopropyl-3-methylphenol, parachlorometaxylenol, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, trichlorocarbanilide, thiabendazole, p-chloro-m-cresol, methyl 2-benzimidazolecarbamate, 1,2-benzisothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, tetrachloroisophthalonitrile, 5-chloro-2,4,6-trifluoroisophthalonitrile, dichlofluanid, N-(fluorodichloromethylthio)phthalimide, N,N'-dimethyl-N'-(dichlorofluoromethylthio)-N'-phenylsulfamide, etc.

[0058] The antimicrobial particles 31 contain the antimicrobial material as described above, and a part of the antimicrobial particles 31 is exposed from the surface of the resin layer 11 on the side opposite to the substrate 12, so that the resin layer 11, that is, the light transmission plate 10, can exhibit antimicrobial properties.

[0059] Here, when the antimicrobial particles 31 mainly contain an inorganic material, the average particle diameter of the antimicrobial particles 31 is preferably 0.5 μm or more and 8.5 μm or less, more preferably 1.0 μm or more and 8.0 μm or less, and still more preferably 3.0 μm or more and 8.0 μm or less. When the antimicrobial particles 31 mainly contain an organic material, the average particle diameter is preferably 0.01 μm or more and 5.0 μm or less, more preferably 0.05 μm or more and 3.0 μm or less, and still more preferably 0.1 μm or more and less than 2.0 μm.

[0060] Thus, when the antimicrobial particles 31 mainly contain an inorganic material, the average particle diameter of the antimicrobial particles 31 is set larger compared to the case where the antimicrobial particles 31 mainly contain an organic material. Therefore, when the antimicrobial particles 31 mainly contain an inorganic material, due to a part of the antimicrobial particles 31 being exposed from the surface on the side opposite to the substrate 12 of the resin layer 11, the light transmittance of the resin layer 11 (light-transmitting plate 10) tends to decrease. For the purpose of accurately suppressing or preventing the light transmittance of the resin layer 11 (light-transmitting plate 10) from decreasing undesirably, when the resin layer 11 is viewed in plan view, the total area of the exposed areas where a plurality of antimicrobial particles 31 are exposed from the surface of the resin layer 11 is preferably 200 μm 2 or more and 15000 μm 2 or less, more preferably 400 μm 2 or more and 14000 μm 2 or less, still more preferably 500 μm 2 or more and 7000 μm 2 or less. By setting the size of the total area within such a range, excellent light transmittance can be surely maintained in the resin layer 11 (light-transmitting plate 10).

[0061] In addition, when the antimicrobial particles 31 are mainly composed of an inorganic material, the content of the antimicrobial particles 31 in the resin layer 11 is preferably set to 0.4 wt% or more and 7.5 wt% or less, more preferably 1.0 wt% or more and 5.5 wt% or less, and still more preferably 3.0 wt% or more and 5.5 wt% or less. When the antimicrobial particles 31 are mainly composed of an organic material, the content is preferably set to 1.0 wt% or more and 10.0 wt% or less, more preferably 2.0 wt% or more and 7.5 wt% or less. Thereby, excellent antimicrobial properties can be exhibited in the resin layer 11 (light transmission plate 10). When the antimicrobial particles 31 are mainly composed of an inorganic material, the total area is 200 μm 2 or more per 500 μm × 500 μm and 15000 μm 2 or less, and thus excellent light transmittance can be imparted to the resin layer 11 (light transmission plate 10).

[0062] The resin layer 11 containing the binder resin 21 and the antimicrobial particles 31 as described above preferably has an average thickness T of 1.0 μm or more and 60.0 μm or less, excluding the region where the antimicrobial particles 31 are exposed, in the thickness direction of the resin layer 11. More preferably, it is 3.0 μm or more and 40.0 μm or less, and still more preferably 5.0 μm or more and 30.0 μm or less. By setting the average thickness of the resin layer 11 within the above range, it can have a strength that satisfies that the maximum height measured using a DuPont impact tester in accordance with JIS K 5600-5-3 is surely 120 cm or more. When the antimicrobial particles 31 are mainly composed of an inorganic material, the total area is 200 μm 2 or more per 500 μm × 500 μm and 15000 μm 2 or less, and thus excellent light transmittance can be imparted to the resin layer 11 (light transmission plate 10).

[0063] By using the light-transmitting plate 10 having the substrate 12 and the resin layer 11 configured as such, in the present invention, the light-transmitting plate 10 is made to be rich in mechanical strength such as toughness. Specifically, when a 500 g weight is dropped using a DuPont impact tester conforming to JIS K 5600-5-3, the maximum height at which this light-transmitting plate 10 is not penetrated is set to 120 cm or more. Therefore, for optical components worn by a person such as a face shield covering the front of the wearer's head, a transparent mask covering the wearer's mouth, and protective glasses covering the wearer's eyes, and for optical components arranged between people such as a transparent fixture (partition plate), by using this light-transmitting plate 10 for a light-transmitting portion where light transmissibility is required, since the strength (mechanical strength) required for use as an optical component can be imparted to the optical component, the optical component can be made to have excellent reliability. Further, in the resin layer 11, the antimicrobial particles 31 can be held with excellent retention by the binder resin 21. Therefore, it is possible to accurately suppress or prevent the antimicrobial particles 31 from accidentally detaching from the resin layer 11 at an early stage.

[0064] Further, the light-transmitting plate 10 only needs to satisfy that the maximum height measured using a DuPont impact tester conforming to JIS K 5600-5-3 is 120 cm or more, but it is preferably 120 cm or more and less than 150 cm, and more preferably 150 cm or more. By setting the maximum height measured in the light-transmitting plate 10 to be equal to or higher than the lower limit value, it can be said that the light-transmitting plate 10 has more excellent strength (mechanical strength).

[0065] In addition, the light-transmitting plate 10 including the substrate 12 and the resin layer 11 having such a configuration has light transmissibility. Specifically, the parallel light transmissibility of the light-transmitting plate 10, which is measured in accordance with JIS K 7136 and JIS K 7361, is preferably set to 15% or more, more preferably 30% or more, and even more preferably 60% or more and 98% or less. By setting the parallel light transmissibility of the light-transmitting plate 10 to be equal to or higher than the lower limit value, it can be said that the light-transmitting plate 10 has excellent light transmissibility. Therefore, it becomes possible to visually recognize with excellent visibility through this light-transmitting plate 10.

[0066] In addition, for the light-transmitting plate 10, the haze value measured in accordance with JIS K 7136 is preferably 80% or less, and more preferably 0.1% or more and 30% or less. By satisfying such a relationship of the haze value, the effect obtained by setting the parallel light transmissibility of the light-transmitting plate 10 to be equal to or higher than the lower limit value can be more significantly exhibited.

[0067] The light-transmitting plate 10 having the above-described configuration is used as a light-transmitting portion that requires light transmissibility in optical components worn by people, such as a face shield that covers the front of the wearer's head, a transparent mask that covers the wearer's mouth, and protective glasses that cover the wearer's eyes, and in optical components arranged between people, such as a transparent fixture (partition plate). Thereby, in such an optical component, the light-transmitting plate 10 functions as a partition member that partitions the first space and the second space, and can surely prevent the diffusion of droplets between the first space and the second space. Further, when using the optical component, the strength required for the light-transmitting plate 10 provided in the optical component can be surely exhibited in the light-transmitting plate 10. Furthermore, objects located in each space can be visually recognized through the light-transmitting plate 10.

[0068] (Manufacturing method of the light-transmitting plate 10) The light-transmitting plate 10 having the above-described configuration can be manufactured, for example, by using a coextrusion method according to the manufacturing method shown below.

[0069] Hereinafter, each step for manufacturing the light transmission plate 10 will be described. [1] First, in order to form the substrate 12, a resin composition (A) containing a transparent resin as a main material and, if necessary, an additive is prepared. Also, in order to form the resin layer 11, a resin composition (B) containing the antimicrobial particles 31 and the binder resin 21 is prepared.

[0070] [2] Next, using the coextrusion method, a light transmission plate 10 is obtained which includes the substrate 12 and two resin layers 11 laminated on both sides of the substrate 12, respectively.

[0071] In this step [2], the resin composition (A) for forming the substrate 12 and the resin composition (B) for forming the resin layer 11 are respectively put into the main extruder and the sub-extruder provided in the single-screw kneading coextruder, kneaded under heating conditions to be in a molten state or a softened state, and then coextruded. As a result, the molten resin in which the resin composition (B), the resin composition (A), and the resin composition (B) are laminated in this order in a molten state or a softened state is continuously extruded from the opening of the T-die provided in the extrusion device. Then, after forming the molten resin into a sheet shape with the roll provided in the extrusion device and cooling it, a light transmission plate 10 composed of a laminate in which the resin layers 11 are laminated on both sides of the substrate 12 can be obtained.

[0072] Note that the heating temperature when kneading the resin compositions (A) and (B) is not particularly limited and varies slightly depending on the types of the transparent resin and the binder resin 21. For example, it is preferably 150°C or higher and 320°C or lower, and more preferably 160°C or higher and 300°C or lower. Thereby, the molten resin in a molten state or a softened state can be surely obtained by extrusion from the opening of the T-die.

[0073] By going through the above steps, the light transmission plate 10 can be manufactured. In addition, in this embodiment, the light-transmitting plate 10 has been described in the case where the resin layers 11 are provided on both surfaces of the substrate 12. However, the present invention is not limited to this case, and depending on the use of the light-transmitting plate 10 or the like, the resin layer 11 may be provided on at least one surface of the substrate 12. In other words, in the light-transmitting plate 10, the resin layer 11 may be selectively formed on the surface on which droplets adhere.

[0074] As described above, the light-transmitting plate and the optical component of the present invention have been described. However, the present invention is not limited thereto.

[0075] For example, in the light-transmitting plate and the optical component of the present invention, each component can be replaced with any component that can exhibit a similar function, or a component having an arbitrary configuration can be added.

Example

[0076] Hereinafter, the present invention will be described more specifically based on examples. Note that the present invention is not limited by these examples.

[0077] 1. Preparation of raw materials First, the resin materials and antimicrobial particles prepared for the production of the light-transmitting plate 10 in each example and comparative example are shown below as raw materials.

[0078] (Resin material A) As the resin material A, polyethylene terephthalate (PET, manufactured by SK Chemicals Co., Ltd., "Sky Green K2012") was prepared.

[0079] (Resin material B) As the resin material B, polycarbonate (PC, manufactured by Mitsubishi Engineering Plastics Corporation, "Iupilon E-2000") was prepared.

[0080] (Resin material C) As the resin material C, an acrylic resin (PMMA, manufactured by Asahi Kasei Corporation, "Delpet 80HD") was prepared.

[0081] (Resin material D) As the resin material D, a polyfunctional acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., "NK Ester A-DCP", bifunctional) was prepared.

[0082] (Antimicrobial particle A (inorganic material)) As the antimicrobial particle A, zeolite Ag (manufactured by Sinanen Zeomic Co., Ltd., "LJ10D", average particle diameter: 8.0 μm) was prepared.

[0083] (Antimicrobial particle B (inorganic material)) As the antimicrobial particle B, silver molybdate (manufactured by High Purity Chemical Research Institute, average particle diameter: 3.0 μm) was prepared.

[0084] (Antimicrobial particle C (organic material)) As the antimicrobial particle C, an organic composite material of diiodomethyl-p-trisulfone (manufactured by MIC Co., Ltd., "PBM-MO rev1") was prepared.

[0085] (Antimicrobial particle E (organic material)) As the antimicrobial particle E, an organic material of diiodomethyl-p-trisulfone (manufactured by MIC Co., Ltd., "PBM-ON-100") was prepared.

[0086] (Antimicrobial particle F (organic material)) As the antimicrobial particle F, a quaternary ammonium salt compound (manufactured by Inui Co., Ltd., "4,4'-(tetramethylenedicarbonyl diamino) bis(1-decylpyridinium bromide)") was prepared.

[0087] 2. Manufacture of the light transmission plate 10 (Example 1) (1) As the transparent resin, the resin material A (PET) was prepared. Further, as the mixed raw material, a material prepared by adjusting the content of the antimicrobial particle A (LJ10D) in the resin material A (PET) to 1% by weight was prepared.

[0088] (2) Next, the mixed raw material was charged into the sub-extruder and the resin material A was charged into the main extruder, and then these resins were heated and melted at 240 °C and co-extruded.

[0089] <3>Next, the resin co-extruded from the T-die, i.e., the mixed raw material and the resin material A co-extruded in a laminated state, are solidified by a cooling roll to obtain a flat light-transmitting plate 10 including a substrate 12 with an average thickness of 3 mm and resin layers 11 with an average thickness of 15 μm laminated on both surfaces of the substrate 12, respectively.

[0090] Through the above steps, the light-transmitting plate 10 of Example 1 with resin layers 11 formed on both the upper and lower surfaces of the substrate 12 was obtained.

[0091] (Examples 2 to 5) The light-transmitting plates 10 of Examples 2 to 5 were obtained in the same manner as in Example 1, except that at least one of the type of transparent resin used for forming the substrate 12, the average thickness of the substrate 12, the type of antimicrobial particles 31 used, the content of the antimicrobial particles 31 in the resin composition, the type of binder resin 21 used, and the average thickness of the resin layer 11 was changed as shown in Table 1.

[0092] (Comparative Example 1) <1>As a mixed raw material, 3 parts by weight of a photoinitiator (1-hydroxycyclohexyl phenyl ketone, "Omnirad 184") and an antimicrobial particle G (quaternary ammonium salt compound) were prepared so that the content was 1 wt% with respect to 100 parts by weight of the resin material D (A-DCP).

[0093] <2>Next, the above mixed raw material was applied on a glass plate with a bar coater and then dried, and then peeled off from the glass plate to obtain a flat light-transmitting plate composed of a single layer of the substrate 12 with an average thickness of 1 mm. Through the above steps, the light-transmitting plate of Comparative Example 1 composed of the substrate 12 was obtained.

[0094] 4. Evaluation The light-transmitting plates 10 of each example and comparative example were evaluated by the following method.

[0095] 1) Parallel light transmittance For the light transmission plates 10 of each example and comparative example, the parallel light transmittance was measured in accordance with JIS K 7136 and JIS K 7361 using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., "NDH4000").

[0096] 2) Haze value For the light transmission plates 10 of each example and comparative example, the haze value was measured in accordance with JIS K 7136 using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., "NDH4000").

[0097] 3) DuPont impact test In accordance with JIS K 5600-5-3, using a DuPont impact tester (manufactured by Ueshima Seisakusho Co., Ltd., "IM-4530"), the maximum height at which the light transmission plates 10 of each example and comparative example were not penetrated when a 500 g weight was dropped was measured. Then, the maximum height was evaluated according to the following criteria.

[0098] [Evaluation criteria] A: The measured maximum height is 150 cm or more B: The measured maximum height is 120 cm or more and less than 150 cm C: The measured maximum height is less than 120 cm

[0099] 4) Visibility through the light transmission plate 10 For the light transmission plates 10 of each example and comparative example, indoors, with the distance between the TV screen, the light transmission plate 10, and the observer being 50 cm each, the TV screen was observed visually through the light transmission plate 10, and the visibility was evaluated according to the following criteria.

[0100] [Evaluation criteria] A: Details can be visually recognized during perspective viewing B: Details are unclear, but people and objects can be distinguished C: It can be determined that there is something D: It cannot be visually recognized

[0101] 5) Antiviral property through the light transmission plate 10 For the light transmission plates 10 of each example and comparative example, influenza virus and feline calicivirus were evaluated according to the following criteria by a test method compliant with ISO 21702.

[0102] [Evaluation Criteria] A: Antiviral activity value is 2.0 or more B: Antiviral activity value is less than 2.0 (-: Missing value or no antibacterial activity was observed)

[0103] 6) Antibacterial property through the light transmission plate 10 For the light transmission plates 10 of each example and comparative example, Escherichia coli was evaluated according to the following criteria by a test method compliant with ISO 22196.

[0104] [Evaluation Criteria] A: Antibacterial activity value is 2.0 or more B: Antibacterial activity value is less than 2.0

[0105] 7) Curvature of the resin layer 11 in the light transmission plate 10 For the light transmission plates 10 of each example and comparative example, after aligning them along a support with a radius of curvature of 360 mm on one side of the light transmission plate 10, they were returned to their original straight shape. Thereafter, the presence or absence of peeling of the resin layer 11 from the substrate 12 on the curved side, as well as the presence or absence of cracks and fractures in the resin layer 11, were visually observed, and the observation results were evaluated according to the following criteria.

[0106] [Evaluation Criteria] A: No peeling of the resin layer 11 from the substrate 12, and No cracks and fractures in the resin layer 11 are observed B: Peeling of the resin layer 11 from the substrate 12, and At least one of cracks and fractures in the resin layer 11 is observed

[0107] The evaluation results of the light transmission plates 10 of each example and comparative example obtained as described above are shown in Table 1 below, respectively. Further, the SEM image of the light transmission plate 10 in the plan view of Example 1 is shown in FIG. 3.

[0108] [Table 1]

[0109] As shown in Table 1, in the light transmission plate 10 of each example, by setting the maximum height measured using a DuPont impact tester to 120 cm or more, the occurrence of peeling, cracking, and splitting of the resin layer 11 due to the bending of the light transmission plate 10 could be reliably suppressed. Therefore, it was shown that the light transmission plate 10 exhibited excellent toughness.

[0110] On the other hand, in the light transmission plate 10 of the comparative example, the maximum height measured using a DuPont impact tester did not satisfy the condition of being 120 cm or more, and the occurrence of peeling, cracking, and splitting of the resin layer 11 due to the bending of the light transmission plate 10 could not be suppressed, and excellent toughness could not be imparted to the light transmission plate 10. [Explanation of Symbols]

[0111] 10 Light transmission plate 11 Resin layer 12 Substrate 21 Binder resin 31 Antimicrobial particles T Average thickness

Claims

1. A light-transmitting plate having light transmissibility that allows the incidence of incident light and the emission of emitted light from both sides, comprising: a flat substrate, and a resin layer laminated on at least one side of one surface side and the other surface side of the substrate, a part of the resin layer is exposed from the surface on the side opposite to the substrate and contains antimicrobial particles having antimicrobial properties, the average thickness of the substrate is 0.1 mm or more and 3.0 mm or less, the average thickness of the resin layer is 3.0 μm or more and 40.0 μm or less, when a 500 g weight is dropped using a DuPont impact tester conforming to JIS K 5600-5-3, the maximum height at which the light-transmitting plate is not penetrated is 120 cm or more, the antimicrobial particles mainly contain an inorganic material, the inorganic material contains silver molybdate, a light-transmitting plate, wherein the average particle diameter of the antimicrobial particles is 0.5 μm or more and 8.5 μm or less.

2. The light-transmitting plate according to claim 1, having a parallel light transmittance of 15% or more as defined in JIS K 7136 and JIS K 7361.

3. The light-transmitting plate according to claim 1 or 2, having a haze value measured in accordance with JIS K 7136 of 80% or less.

4. The light-transmitting plate according to any one of claims 1 to 3, wherein the resin layer further contains a binder resin that holds the antimicrobial particles.

5. The light-transmitting plate according to claim 4, wherein the binder resin is at least one of a polycarbonate resin, a polyester resin, and an acrylic resin.

6. The light-transmitting plate according to any one of claims 1 to 5, wherein the content of the antimicrobial particles in the resin layer is 0.4% by weight or more and 7.5% by weight or less.

7. The light-transmitting plate according to any one of claims 1 to 6, wherein the substrate is composed of at least one of a polycarbonate resin, a polyester resin, and an acrylic resin as a main material.

8. The light-transmitting plate according to any one of claims 1 to 7, which is a partition member that partitions a first space and a second space.

9. An optical component comprising the light-transmitting plate according to any one of claims 1 to 8.

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