JP2023142845A - antiviral sheet - Google Patents

Abstract

To provide an antiviral sheet that has extended antiviral efficacy, or can maintain a higher level of antiviral efficacy over an extended period even when used.SOLUTION: An antiviral sheet contains a metal element-containing layer. At least one surface of the sheet has a water contact angle of 90 degrees or less.SELECTED DRAWING: None

Description

The present invention relates to antiviral sheets and the like.

Due to concerns about hygiene, techniques for applying antibacterial finishing to textile articles are being considered. In recent years, awareness of viral diseases in addition to bacterial diseases has increased, and for this reason, there is a demand for textile articles having antiviral properties.

Patent Document 1 describes that antiviral properties can be imparted by coating a fiber base material with a hydrophobic coating liquid containing copper oxide fine particles.

International Publication No. 2011/040048

While conducting research, the inventors of the present invention noticed that the antiviral properties of antiviral sheets laminated with antiviral components deteriorate with continued use.

An object of the present invention is to provide an antiviral sheet with excellent durability of antiviral properties (particularly, the property of maintaining antiviral properties at a higher level even when the sheet is used).

As a result of extensive research in view of the above-mentioned problems, the present inventors have found that an antiviral sheet that includes a metal element-containing layer and has a water contact angle of at least one surface of 90 degrees or less, I discovered that I could solve the problem. The present inventor conducted further research based on this knowledge and completed the present invention. That is, the present invention includes the following aspects.

Item 1. An antiviral sheet comprising a metal element-containing layer and having a water contact angle of at least one surface of 90 degrees or less.

Item 2. Item 2. The antiviral sheet according to item 1, which includes a base material and has a specific surface area of 50 m ² /g or more.

Item 3. Item 2. The antiviral sheet according to item 2, wherein the base material is a fiber base material.

Item 4. Item 4. The antiviral sheet according to item 3, wherein the fiber base material contains at least one type of fiber selected from the group consisting of rayon fiber, cotton fiber, and acrylic fiber.

Item 5. Item 5. The antiviral sheet according to any one of Items 1 to 4, comprising the metal element-containing layer on the surface.

Item 6. Item 6. The antiviral sheet according to any one of Items 1 to 5, wherein the metal element-containing layer has a thickness of 10 nm or more.

Section 7. Item 7. The antiviral sheet according to any one of Items 1 to 6, wherein the metal element-containing layer contains at least one selected from the group consisting of copper and copper oxide.

Section 8. Item 8. The antiviral sheet according to any one of Items 1 to 7, wherein the surface has a water contact angle of 40 degrees or more.

Item 9. An antiviral product comprising the antiviral sheet according to any one of Items 1 to 8.

According to the present invention, an antiviral sheet with superior antiviral durability (particularly, the ability to maintain antiviral properties at a higher level even when the sheet is used), textile products, etc. containing the sheet can be produced. can be provided.

In this specification, the expressions "contain" and "including" include the concepts of "containing", "comprising", "consisting essentially" and "consisting only".

1. Antiviral sheet In one aspect, the present invention provides an antiviral sheet (herein referred to as "the antiviral sheet of the present invention"), which includes a metal element-containing layer and has a water contact angle of at least one surface of 90 degrees or less. (Sometimes referred to as "antiviral sheet.") This will be explained below.

<1-1. Metal element-containing layer>
The antiviral sheet of the present invention includes a metal element-containing layer.

The metal element-containing layer is a layer containing a metal, an alloy, or a metal compound containing a metal element as a material (metal element material). The metal element-containing layer may contain components other than the metal element material. In that case, the content of the metal element material in the metal element-containing layer is, for example, 70% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, based on 100% by mass of the metal element-containing layer. It is preferably 95% by mass or more, even more preferably 99% by mass or more, and usually less than 100% by mass. When the base material described below is a fiber base material, it is preferable that the metal element material adheres to the surface of the fibers constituting the fiber base material to form a metal element-containing layer.

The metal element contained in the metal element material is not particularly limited as long as it can exhibit antiviral properties. Examples of metal elements include Cu, Al, Si, Ti, Cr, Ni, Zn, Ga, Ge, Y, Zr, Nb, Mo, Ag, In, Sn, Ta, W, Pt, Au, Fe, V, Examples include Mn, Pd, and Ir. Among these, from the viewpoint of antiviral properties, preferred are Cu, Ni, Zn, Ag, etc., and particularly preferred is Cu.

When Cu is included as a metal element, it is preferable that other metal elements are also included. From the viewpoint of corrosion resistance, the other metal elements are preferably Ni, Ti, Zn, etc., and particularly preferably Ni. When Cu is included as a metal element, the content of Cu is, for example, 20% by mass or more, preferably 30% by mass or more, more preferably 40% by mass or more, based on 100% by mass of the metal element in the metal element material. Preferably it is 50% by mass or more, and even more preferably 55% by mass or more. The upper limit of the content is not particularly limited, but is, for example, 95% by mass or 90% by mass.

The metal that can be contained in the metal element material is not particularly limited as long as it can exhibit antiviral properties. Examples of metals include Cu, Al, Si, Ti, Cr, Ni, Zn, Ga, Ge, Y, Zr, Nb, Mo, Ag, In, Sn, Ta, W, Pt, Au, Fe, V, Mn. , Pd, Ir, etc. Among these, from the viewpoint of antiviral properties, preferred are Cu, Ni, Zn, Ag, etc., and particularly preferred is Cu.

When Cu is included as a metal, it is preferable that other metals are also included. In this case, in one embodiment, the metal element material includes an alloy. From the viewpoint of corrosion resistance, the other metals are preferably Ni, Ti, Zn, etc., and particularly preferably Ni. When Cu is included as a metal, the content of Cu is, for example, 20% by mass or more, preferably 30% by mass or more, more preferably 40% by mass, based on 100% by mass of the metal element material (for example, an alloy, preferably a solid solution). The content is more preferably 50% by mass or more, even more preferably 55% by mass or more. The upper limit of the content is not particularly limited, but is, for example, 95% by mass, 90% by mass, 80% by mass, or 75% by mass.

Examples of the metal compound include, but are not limited to, oxides, nitrides, sulfides, and the like. Among these, oxides are preferred.

In a preferred embodiment of the present invention, the metal element-containing layer contains at least one member selected from the group consisting of copper (as a metal or as a constituent metal of an alloy) and copper oxide. Thereby, higher antiviral properties can be exhibited.

The content of the metal element material, the Cu element content, and the Cu metal content described above can be measured and calculated as follows.
Analysis is performed using a scanning X-ray fluorescence analyzer (for example, a Rigaku scanning X-ray fluorescence analyzer ZSX Primus III+ or an equivalent product) with an accelerating voltage of 50 kV, an accelerating current of 50 mA, and an integration time of 60 seconds. The X-ray intensity of Kα rays of the metal component to be measured is measured, and in addition to the peak position, the intensity at the background position is also measured so that the net intensity can be calculated. The measured intensity value can be converted into a content rate or amount using a calibration curve created in advance. The same sample is analyzed five times, and the average value is taken as the average content rate/content.

The thickness of the metal element-containing layer is not particularly limited, and from the viewpoint of antiviral properties, it is, for example, 5 nm or more, preferably 10 nm or more, more preferably 20 nm or more, and even more. The thickness is preferably 10 nm or more, more preferably 20 nm or more, and even more preferably 30 nm, from the viewpoint of easily controlling the water contact angle of the antiviral sheet of the present invention to a low level and easily exhibiting sustained antiviral properties. More preferably, the thickness is 35 nm or more. On the other hand, from the viewpoint of texture, the thickness is, for example, 1000 nm or less, preferably 500 nm or less, more preferably 300 nm or less, still more preferably 200 nm or less, even more preferably 150 nm or less. The thickness range is preferably 10 to 500 nm, more preferably 20 to 300 nm, and still more preferably 30 to 300 nm, from the viewpoint of antiviral properties, durability, texture, etc.

The thickness of the metal element-containing layer can be determined by fluorescent X-ray analysis. Specifically, using a scanning X-ray fluorescence analyzer (for example, Rigaku's scanning X-ray X-ray analyzer ZSX Primus III+ or an equivalent product), the acceleration voltage was 50 kV, the acceleration current was 50 mA, and the integration time was 60 seconds. Analyze as. The X-ray intensity of Kα rays of the metal component to be measured is measured, and in addition to the peak position, the intensity at the background position is also measured so that the net intensity can be calculated. The measured intensity value can be converted into thickness using a calibration curve prepared in advance. The same sample is analyzed five times, and the average value is taken as the average thickness.

In the antiviral sheet of the present invention, it is desirable to provide a metal element-containing layer on the surface. Thereby, antiviral properties can be exhibited more effectively. From this point of view, in the antiviral sheet of the present invention, the ratio of the area of the metal element-containing layer exposed on the surface is, for example, 50% or more with respect to 100% of the total area of the antiviral sheet of the present invention, Preferably it is 70% or more, more preferably 90% or more, even more preferably 95% or more, even more preferably 99% or more, and particularly preferably 100%.

The layer structure of the metal element-containing layer is not particularly limited. The metal element-containing layer may be a single layer, or may be a plurality of layers having the same or different compositions. Further, the metal element-containing layer may be formed of a film such as an oxide film on one or both of its two main surfaces.

<1-2. Base material>
The antiviral sheet of the present invention preferably further includes a base material. In this case, the metal element-containing layer is arranged on the base material, in other words, it is arranged above at least one of the two main surfaces of the base material. The antiviral sheet of the present invention is preferably placed directly on the substrate (ie, without any other layer).

The base material is not particularly limited as long as it is in the form of a sheet. The base material is not particularly limited, but includes, for example, a fiber base material, a carbonaceous base material, a resin base material, a paper base material, a rubber base material, and the like.

From the viewpoint of sustainability of antiviral properties, it is preferable that the specific surface area of the base material is 50 m ² /g or more. When the specific surface area is above a certain level, the portion of the metal element-containing layer that is not subjected to friction increases, its peeling is suppressed, and the sustainability of antiviral properties is further improved. The specific surface area is more preferably 80 m ² /g or more, still more preferably 100 m ² /g or more, even more preferably 110 m ² /g or more, particularly preferably 120 m ² /g or more. The specific surface area is preferably 1000 m ² /g or less, more preferably 900 m ² /g or less from the viewpoint of improving the mechanical strength of the base material.

The layer structure of the base material is not particularly limited. The base material may be composed of a single type of base material or a combination of two or more types of base materials.

The thickness of the base material may vary depending on the type of base material, and is not particularly limited. The thickness of the base material is, for example, 0.01 to 10 mm, preferably 0.05 to 5 mm.

As the base material, a fiber base material is particularly preferable from the viewpoints that the specific surface area can be easily controlled within the above range and that the antiviral properties can be easily maintained. The fiber base material will be explained below.

The fiber base material is not particularly limited as long as it is a base material containing fibers or fiber bundles as a material and is in the form of a sheet. The fiber base material may contain components other than fibers and fiber bundles as long as the effects of the present invention are not significantly impaired. In that case, the total amount of fibers and fiber bundles in the fiber base material is, for example, 80% by mass or more, preferably 90% by mass or more, more preferably 95% by mass or more, still more preferably 99% by mass or more, and usually 100% by mass or more. Less than % by mass. Examples of the fiber base material include woven fabrics (for example, plain weave, twill weave, satin weave, etc.), knitted fabrics, nonwoven fabrics, and paper. Among these, woven fabrics, knitted fabrics, etc. are preferred, and knitted fabrics are more preferred, from the viewpoint that the fiber surface area is relatively large and the antiviral properties of the antiviral sheet of the present invention are further improved. The fiber base material may be subjected to silage treatment or calender treatment.

The fibers constituting the fiber base material are not particularly limited, and include, for example, synthetic fibers (for example, nylon fibers, polyester fibers, acrylic fibers, vinylon fibers, polyolefin fibers, polyethylene fibers, polypropylene fibers, polyurethane fibers, etc.), recycled fibers (for example, rayon, polynosic, cupro, lyocell, acetate, etc.), vegetable fibers (e.g. cotton fibers, hemp fibers, flax fibers, rayon fibers, polynosic fibers, cupro fibers, lyocell fibers, acetate fibers, etc.), animal fibers (e.g. wool, silk, Organic fibers such as natural silk silk, mohair, cashmere, camel, llama, alpaca, vicuña, angora, spider silk, chitin fiber, chitosan fiber, deoxyribonucleic acid fiber, etc.), bacteriocellulose fiber; Carbon fiber (e.g. PAN carbon fiber, pitch carbon fibers, carbon nanotubes, etc.), glass fibers (e.g. glass wool, glass fibers, etc.), mineral fibers (e.g. warm asbestos, white asbestos, blue asbestos, brown asbestos, orthophyllite, tremolite asbestos, solar asbestos, etc.) Inorganic fibers such as artificial mineral fibers (for example, rock wool, ceramic fibers, etc.), metal fibers (for example, stainless steel fibers, aluminum fibers, iron fibers, nickel fibers, copper fibers, etc.) can be widely used. Among these, rayon fibers, cotton fibers, acrylic fibers, nylon fibers, Examples include cupra fiber, wool, silk, chitin fiber, chitosan fiber, deoxyribonucleic acid fiber, bacterial cellulose fiber, and particularly preferred are rayon fiber, cotton fiber, and acrylic fiber.

The fibers may be in any form, such as continuous long fibers, short fibers cut from continuous long fibers, or milled yarns ground into powder.

The fibers may be used alone or in combination of two or more.

The fiber bundle is not particularly limited as long as it is made of a plurality of fibers. The number of fibers constituting the fiber bundle is, for example, 5 or more, 10 or more, 20 or more, 50 or more, and on the other hand, for example, 50,000 or less, 20,000 or less, 15,000 or less, or 2,000 or less. These upper limit values and lower limit values can be arbitrarily combined.

<1-3. Water contact angle＞
In the antiviral sheet of the present invention, at least one surface has a water contact angle of 90 degrees or less. As a result, the antiviral sheet of the present invention has more excellent long-lasting antiviral properties. The water contact angle is more preferably 89 degrees or less, still more preferably 85 degrees or less, even more preferably 80 degrees or less, particularly preferably 75 degrees or less.

In a preferred embodiment of the present invention, the above-mentioned "surface" is the surface on the side where the metal element-containing layer is disposed (for example, the exposed side).

The above-mentioned water contact angle of the antiviral sheet of the present invention is preferably 40 degrees or more from the viewpoint of suppressing adsorption of dust and further improving the sustainability of antiviral properties. The water contact angle is more preferably 45 degrees or more, still more preferably 50 degrees or more, even more preferably 55 degrees or more.

The water contact angle on the surface of the antiviral sheet of the present invention is measured as follows. Measurement is performed as follows using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., trade name "DropMaster DM500". 1 μL of pure water is dropped onto the surface of the metal element-containing layer side of the antiviral sheet, The contact angle is measured immediately after (within 3 seconds).The average value of 10 measurements is used as the measurement value.

The means for controlling the water contact angle on the surface of the antiviral sheet of the present invention to be 90 degrees or less is not particularly limited, but for example, a more hydrophilic material may be used for the layer (e.g., base material) on which the metal element-containing layer is laminated. Examples include selecting a material with a high temperature, reducing the oil content and surfactant contained in the layer (e.g., base material) on which the metal element-containing layer is laminated (e.g., by washing), and increasing the thickness of the metal element-containing layer. .

Although we do not wish to give a restrictive interpretation, one of the reasons why antiviral properties are excellent in durability when the surface water contact angle is 90 degrees or less is thought to be as follows. The degree of hydrophilicity of the surface of the antiviral sheet of the present invention is considered to be influenced by the degree of hydrophilicity of the layer (for example, the base material) forming the metal element-containing layer. Therefore, the fact that the degree of hydrophilicity of the surface of the antiviral sheet of the present invention is above a certain level (that is, the water contact angle is 90 degrees or less) means that the layer forming the metal element-containing layer (for example, the base material ) reflects that the hydrophilicity is above a certain level, this increases the adhesion between the layer forming the metal element-containing layer (e.g., the base material) and the metal element material, and suppresses the peeling of the metal element material due to wear. , it is thought that the durability of antiviral properties will be increased.

<1-4. Antiviral properties and their durability>
The antiviral sheet of the present invention has antiviral properties.

Target viruses include, but are not limited to, influenza viruses (e.g., type A, type B, etc.), rubella virus, Ebola virus, coronavirus, measles virus, varicella/shingles virus, herpes simplex virus, mumps virus, and arbovirus. , RS virus, SARS virus, SARS-Cov2 virus, hepatitis virus (e.g., hepatitis B virus, hepatitis C virus, etc.), yellow fever virus, AIDS virus, rabies virus, hantavirus, dengue virus, Nipah virus, lyssavirus, etc. envelopes. Viruses (enveloped viruses): Non-enveloped viruses (enveloped viruses) such as adenovirus, norovirus, rotavirus, human papillomavirus, poliovirus, enterovirus, coxsackievirus, human parvovirus, encephalomyocarditis virus, poliovirus, and rhinovirus. virus), etc. Among these, preferred are influenza viruses, noroviruses, and coronavirus non-enveloped viruses, and more preferred are influenza viruses, noroviruses, coronaviruses, and the like.

The target viruses may be one type alone or a combination of two or more types.

The antiviral sheet of the present invention has superior antiviral durability. Specifically, antiviral properties can be maintained at a higher level even when wear occurs due to use. Specifically, for an unused product, the antiviral property is preferably 99% or more, more preferably 99% or more when evaluated according to "(2-2) Evaluation of persistence of antiviral property" in the Examples below. .5% or more.

<1-5. Manufacturing method＞
The antiviral sheet of the present invention can be obtained, for example, by a method including a step of depositing a metal element-containing layer on a base material.

Although not particularly limited, the attachment can be performed by, for example, a sputtering method, a vacuum evaporation method, an ion plating method, a chemical vapor deposition method, a pulsed laser deposition method, or the like. Among these, the sputtering method is preferred from the viewpoint of film thickness controllability.

The sputtering method is not particularly limited, and examples thereof include DC magnetron sputtering, high frequency magnetron sputtering, and ion beam sputtering. Further, the sputtering apparatus may be of a batch type or a roll-to-roll type.

2. Applications The antiviral sheet of the present invention has excellent antiviral properties and durability. Therefore, it can be used in various fields as an antiviral sheet. For example, the antiviral sheet of the present invention can be used in antiviral products (or antiviral products). Therefore, in one aspect, the present invention relates to an antiviral product comprising the antiviral sheet of the present invention.

Examples of products include textile products. Specifically, for example, coats, jackets, pants, skirts, sportswear, dress shirts, knit shirts, blouses, sweaters, cardigans, nightwear, underwear, supporters, socks, tights, hats, scarves, mufflers, collar wraps, gloves, Linings for clothes, interlining for clothes, batting for clothes, clothing such as work clothes, uniforms, and school uniforms, curtains, futon fabric, futon cotton, pillowcases, sheets, mats, carpets, towels, handkerchiefs, masks, filters, Examples include textile products such as decorative cloth/fabric, wall cloth, wallpaper, and floor coverings.

The antiviral product may consist of all the constituent materials being the antiviral sheet of the present invention, or some of the materials may be the antiviral sheet of the present invention.

The present invention will be described in detail below based on Examples, but the present invention is not limited to these Examples.

(1) Production of antiviral sheet (Example 1)
A nonwoven fabric having a thickness of 200 μm and a specific surface area of 132 m ² /g was produced by a wet method using short rayon fibers (fineness: 2.8 dtex, fiber length: 51 mm) as a base material.
. This fiber base material was placed in a roll-to-roll type sputtering device and evacuated to a pressure of 5.0×10 ⁻⁴ Pa or less. Subsequently, argon gas was introduced, the gas pressure was set to 0.5 Pa, and a layer made of a copper-nickel alloy (copper content: 70% by mass, nickel The fiber base material and the metal element-containing layer were laminated in this order to obtain an antiviral sheet.
Note that the surface area is a value measured by the BET method using an automatic specific surface area measuring device (BELSORP miniX, manufactured by Microtrac Bell Co., Ltd.) and using nitrogen gas as the adsorption gas.

(Example 2)
As a base material, a nonwoven fabric with a thickness of 200 μm and a specific surface area of 152 m ² /g was prepared by a wet method using short cotton fibers (fineness: 2.3 dtex, fiber length: 47 mm). An antiviral sheet was obtained in the same manner as in Example 1.

(Example 3)
As a base material, a nonwoven fabric with a thickness of 200 μm and a specific surface area of 143 m ² /g was prepared by a wet method using acrylonitrile staple fibers (fineness: 2.6 dtex, fiber length: 61 mm). An antiviral sheet was obtained in the same manner as in Example 1.

(Example 4)
As a base material, a nonwoven fabric with a thickness of 200 μm and a specific surface area of 48 m ² /g was produced by a wet method using acrylonitrile short fibers (fineness: 7.7 dtex, fiber length: 52 mm). An antiviral sheet was obtained in the same manner as in Example 1.

(Example 5)
As a base material, a base material (thickness: 200 μm, specific surface area: 115 m ² /g, composition: polyester fiber) obtained by oil removal treatment of a polyester mesh (manufactured by Kurubaa Co., Ltd., opening 265 μm, mesh 66) was used. An antiviral sheet was obtained in the same manner as in Example 1 except for using the following. Specifically, in the oil removal treatment, the fiber base material was immersed in pure water for 1 hour and then air-dried to remove oil adhering to the fiber base material.

(Comparative example 1)
An antiviral sheet was obtained in the same manner as in Example 5 except that the oil removal treatment was not performed.

(Comparative example 2)
An antiviral sheet was obtained in the same manner as in Example 1, except that a polypropylene film (thickness: 200 μm, specific surface area: 29 m ² /g, composition: polypropylene fiber, manufactured by Kyushu Kasei Co., Ltd.) was used as the base material. .

(Comparative example 3)
As a base material, a nonwoven fabric with a thickness of 200 μm and a specific surface area of 125 m ² /g was produced by a wet method using polypropylene staple fibers (fineness: 2.7 dtex, fiber length: 43 mm). An antiviral sheet was obtained in the same manner as in Example 1.

(Comparative example 4)
An antiviral sheet was obtained in the same manner as in Example 5, except that the thickness of the metal element-containing layer was 9 nm.

(Comparative example 5)
An antiviral sheet was obtained in the same manner as in Example 1, except that a polyester fiber base material (thickness: 100 μm, specific surface area: 105 m ² /g, manufactured by Sawamura Co., Ltd., product number: Queen's Coat G5500) was used as the base material. Ta.

(2) Measurement/evaluation water
(2-1) Measurement of water contact angle The water contact angle on the surface of the metal element-containing layer side of the antiviral sheet was measured as follows. The water contact angle on the surface of the metal element-containing layer side of the antiviral sheet was measured as follows using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., trade name "DropMaster DM500". 1 μL of pure water was dropped onto the surface of the metal element-containing layer side of the sheet, and the contact angle was measured immediately (within 3 seconds).The average value of 10 measurements was used as the measurement value.

(2-2) Evaluation of durability of antiviral properties The durability of antiviral properties of the antiviral sheet was measured as follows. That is, the surface of the antiviral sheet on the metal element-containing layer side was rubbed 100 times using the Martindale method (based on JIS L 1096 E method (Martindale method)). Based on JIS L 1922, an antiviral test was conducted as follows on the antiviral sheet that was rubbed 100 times.

0.4 g of the antiviral sheet was cut out, and the fiber sheet and virus solution (feline calicivirus) were allowed to react at 25°C for 2 hours. Thereafter, the virus solution was collected and a dilution series was prepared. Cells were infected with the dilution series and the virus infectivity titer was measured. Antiviral properties (virus reduction rate (%)) were determined from the virus infectivity titer, and 〇×△ was determined according to the following criteria.
○: Virus reduction rate of 99.5% or more.
Δ: Virus reduction rate of 99% or more and less than 99.5%.
×: Virus reduction rate less than 99%.

(3) Results The results are shown in Tables 1 and 2.

Note that the antiviral sheet of Example 1 had a lot of dirt attached to it due to wear during sustainability evaluation. For this reason, it is thought that the antiviral sheet of Example 1 would have a lower durability evaluation than the antiviral sheets of Examples 2 and 3 when tested under conditions of greater wear.

Claims (9)

An antiviral sheet comprising a metal element-containing layer and having a water contact angle of at least one surface of 90 degrees or less. The antiviral sheet according to claim 1, comprising a base material and having a specific surface area of 50 m ² /g or more. The antiviral sheet according to claim 2, wherein the base material is a fiber base material. The antiviral sheet according to claim 3, wherein the fiber base material contains at least one type of fiber selected from the group consisting of rayon fiber, cotton fiber, and acrylic fiber. The antiviral sheet according to any one of claims 1 to 4, comprising the metal element-containing layer on the surface. The antiviral sheet according to any one of claims 1 to 5, wherein the metal element-containing layer has a thickness of 10 nm or more. The antiviral sheet according to any one of claims 1 to 6, wherein the metal element-containing layer contains at least one selected from the group consisting of copper and copper oxide. The antiviral sheet according to any one of claims 1 to 7, wherein the surface has a water contact angle of 40 degrees or more. An antiviral product comprising the antiviral sheet according to any one of claims 1 to 8.