KR102654080B1 - Antibacterial thermoplastic polyurethane film and antibacterial thermoplastic polyurethane fabric comprising the same - Google Patents

Abstract

The present invention relates to a thermoplastic polyurethane film, and more specifically, to a base layer made of a thermoplastic polyurethane resin; and an antibacterial coating layer formed on the base layer, including an antibacterial agent and an embossed layer, wherein the antibacterial agent contains zinc oxide, zeolite, or both. The antibacterial thermoplastic polyurethane film can exhibit high antibacterial and antiviral effects within a short period of time.

Description

Antibacterial thermoplastic polyurethane film and antibacterial thermoplastic polyurethane fabric comprising the same}

The present invention relates to an antibacterial thermoplastic polyurethane film that can be used for fabric purposes.

Recently, with the emergence of highly contagious viruses, demand for antibacterial products is increasing. Due to global environmental changes, in addition to common pathogens such as existing pathogenic Escherichia coli, Staphylococcus aureus, and pneumoniae, deadly infectious diseases such as coronavirus, new flu, AI, foot-and-mouth disease, and MRSA are increasing day by day, and due to the effects of antibiotic abuse and excessive consumption of instant foods, As the human body's immunity decreases, fatal threats to health are increasing when the body is exposed to harmful pathogens. Accordingly, the demand for antibacterial clothing and supplies is rapidly increasing not only in medical facilities such as hospitals but also in everyday life.

Recently, there have been attempts to replace textile fabrics with synthetic resin materials by taking advantage of the advantages of synthetic resin materials. However, synthetic resins such as PET, POE (polyolefin elastomer), EVA, LLDPE, and PVC have experienced limitations in their applicability to clothing and household goods due to physical limitations.

KR 2017-0136434 A1

The present invention is to provide an antibacterial thermoplastic polyurethane film that can be used as a fabric for clothing and household goods (pouch shell, handle cover, tablecloth, etc.).

In order to achieve the above technical problem, the present invention includes a base layer made of a thermoplastic polyurethane resin; and an antibacterial coating layer formed on the base layer, including an antibacterial agent and an embossed layer, wherein the antibacterial agent contains zinc oxide, zeolite, or both.

Additionally, the present invention provides an antibacterial thermoplastic polyurethane fabric including the antibacterial thermoplastic polyurethane film.

The antibacterial thermoplastic polyurethane film according to the present invention not only exhibits high antibacterial properties against Gram-positive bacteria and Gram-negative bacteria, but also exhibits excellent antiviral properties against coronaviruses. Additionally, these effects may appear within a short period of time (eg, 30 minutes).

The antibacterial thermoplastic polyurethane film according to the present invention can be applied to clothing and household goods such as pouch shells, handle covers, and tablecloths to exhibit antibacterial and antiviral performance.

The antibacterial thermoplastic polyurethane fabric according to the present invention can exhibit high droplet blocking and moisture permeability (waterproofing).

1 is a diagram showing a thermoplastic polyurethane film according to an embodiment of the present invention.
Figure 2 is a photograph showing the wrinkle resistance of thermoplastic polyurethane films according to Example 1 and Comparative Examples 1-1 to 1-4.
Figure 3 is a photograph showing whether the antibacterial layer according to Examples 2-1 and 2-2 and Comparative Examples 2-1 to 2-3 is discolored in appearance.

Hereinafter, the present invention will be described.

The present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. However, the present embodiments only serve to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. It is provided for information purposes only.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless clearly specifically defined.

In addition, the size and thickness of each component shown in the drawings are shown arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is shown.

In addition, throughout the specification, when a part is said to "include" a certain element, this means that it does not exclude other elements but may further include other elements, unless specifically stated to the contrary. .

One embodiment of the present invention includes a base layer made of a thermoplastic polyurethane resin; and an antibacterial coating layer formed on the base layer, including an antibacterial agent and an embossed layer, wherein the antibacterial agent contains zinc oxide, zeolite, or both.

Figure 1 is a cross-sectional view schematically showing a thermoplastic polyurethane film 100 according to the present invention.

The thermoplastic polyurethane film 100 according to the present invention may include a base layer 20 and an antibacterial coating layer 10 disposed on the base layer 20.

In the thermoplastic polyurethane film 100 according to the present invention, the base layer 20 is made of a thermoplastic polyurethane resin.

The thermoplastic polyurethane (TPU) resin is used as a base resin for the film and can exhibit physical properties such as excellent durability, tensile resilience, elongation, and puncture resistance. Specifically, the tensile resilience of the antibacterial film made of thermoplastic polyurethane resin may be 80% or more, preferably 85% or more, and the elongation may be 800% or more, preferably 1000% or more. In addition, the puncture resistance, which measures the degree of damage due to external friction or scratches, may be 80N or more, preferably 85N or more.

The thickness of the base layer may be 100 to 250 ㎛, preferably 180 to 220 ㎛.

Additionally, the hardness of the base layer may be 70 to 90 degrees (˚), and preferably 80 to 85 degrees (˚).

In the thermoplastic polyurethane film 100 according to the present invention, the antibacterial coating layer 10 formed on the base layer 20 contains an antibacterial agent and includes a first embossed layer 40.

The antibacterial agent can impart antibacterial and antiviral properties to the film.

The antibacterial agent may contain zinc oxide, zeolite, or both.

The zinc oxide not only provides excellent antibacterial properties to the film, but also provides deodorizing properties, ultraviolet (UV) blocking properties, and superhydrophobicity. In particular, zinc oxide in the present invention can further improve antibacterial activity against Gram-negative bacteria.

When zinc oxide is nano-sized, its affinity for germs such as bacteria is improved and its antibacterial properties can be maximized. For example, the average diameter of the zinc oxide may be 8 to 100 nm, preferably 20 to 80 nm, and more preferably 25 to 70 nm.

The content of zinc oxide is not particularly limited, and according to one example, it may be 0.2 to 2.5% by weight, preferably 0.3 to 1.5% by weight, based on the total amount of the antibacterial composition.

In addition, the zeolite is specifically an aluminosilicate hydrate of an alkali metal and/or an alkaline earth metal, and has a three-dimensional network structure formed by sharing oxygen with another tetrahedron (Si,Al)O ₄ tetrahedron, one of the basic units. has This zeolite can impart antibacterial properties to the antibacterial coating layer 10.

The zeolite usable in the present invention is not particularly limited, and examples include ZSM-5, zeolite A, zeolite X, zeolite Y, Mordenite, AlPO ₄ , SAPO, MeAlPO, SAPO-5, , MCM-41, Chabazite, Clipptiolite, silica gel, zirconium-based, titanium-based, silicate, etc. These can be used alone or in a mixture of two or more types.

When these zeolites are ion-exchanged with antibacterial metal ions, the antibacterial properties can be further maximized. The antibacterial metal ion that can be used is not particularly limited as long as it is a metal ion that can commonly provide antibacterial properties in the art. According to one example, the antibacterial metal ions include zinc (Zn), silver (Ag), copper (Cu), mercury (Hg), tin (Sn), lead (Pb), bismuth (Bi), cadmium (Cd), and chromium. It may contain one or more metal ions selected from the group consisting of (Cr), calcium (Ca), sodium (Na), cesium (Cs), potassium (K), and magnesium (Mg).

The size (particle diameter), porosity, and/or pore size of the zeolite are not particularly limited. For example, the average diameter of the zeolite may be 0.2 to 10 μm, preferably 0.3 to 7 μm, and more preferably 0.5 to 3 μm.

The content of the zeolite is not particularly limited, and may be, for example, 0.2 to 2.5% by weight, preferably 0.3 to 1.5% by weight, based on the total amount of the antibacterial coating layer 10.

If at least one type of zinc oxide or zeolite ion-exchanged with zinc is included as an antibacterial agent, no change in appearance may occur even when stored for a long period of time, so it can be applied to various products.

In one embodiment of the present invention, it was confirmed that the antibacterial film using 0.5% by weight of zinc oxide and 0.5% by weight of zeolite ion-exchanged with Zn ²⁺ ions as an antibacterial agent showed little change in appearance even when stored for a long time.

In addition, when both zinc oxide and zeolite ion-exchanged with zinc are included as an antibacterial agent, unlike when zinc oxide or zeolite is used alone as an antibacterial agent, not only Gram-positive bacteria and Gram-negative bacteria, but also SCoV (SARS coronavirus) are used as antibacterial agents. ) can also exhibit excellent antibacterial properties against coronaviruses such as The antibacterial thermoplastic polyurethane film according to an embodiment of the present invention has an antibacterial activity of more than 99.99% against Gram-positive bacteria and Gram-negative bacteria according to the JIS Z 2801 standard, and against SARS Coronavirus (ScoV) according to the ISO 21702 standard. It can have antiviral activity of more than 99.99%. This antibacterial and antiviral activity can appear within 1 hour.

In this case, the antibacterial agent may contain zinc oxide and zeolite in a weight ratio of 1:0.2 to 5.

The antibacterial agent may be included in an amount of 0.5 to 4% by weight, preferably 0.8 to 3% by weight, based on the total weight of the antibacterial coating layer described above.

The above-mentioned antibacterial agent may optionally further include additives commonly known in the art, depending on the purpose of use and use environment of the composition, in addition to the above-mentioned components, if necessary. For example, there are dispersants, moisture absorbents, stabilizers, etc., but it is not limited thereto.

The content of these additives is not particularly limited and can be used within a typical range known in the art. For example, it may be about 0.001 to 10% by weight, specifically about 0.01 to 5% by weight, and more specifically about 0.1 to 3% by weight, based on the total amount of the antibacterial coating layer.

The antibacterial coating layer 10 is formed on the base layer 20 by UV curing coating.

The antibacterial coating layer 10 may be formed by applying a coating composition containing an antibacterial agent and a UV curable resin to a substrate and then curing it by irradiating UV.

The UV curable resin may include oligomers, monomers, photopolymerization initiators, and additives. The oligomer may include radical polymerization-based acrylic resins such as polyester-based acrylates, epoxy-based acrylates, urethane acrylates, polyether acrylates, and silicone archylates as base resins; It may be a kaion polymerization type resin such as alicyclic epoxy resin, glycidyl ether epoxy resin, epoxy acrylate, or vinyl ether. The monomer may be a radical polymerization type monomer such as a monochromatic or multifunctional monomer; It may be a cationic polymerization type monomer such as epoxy monomer, vinyl ether, or cyclic ether. The photopolymerization initiator includes radical polymerization type photopolymerization initiators such as benzoin ethers and amines; It may be a kaion polymerization type photopolymerization initiator such as a diazonium salt, an iodonium salt, or a sulfonium salt. For the radical polymerization type, the additive may be an adhesion agent, filler, or polymerization inhibitor, and for the cationic polymerization type, the additive may be a silane coupling agent.

According to the present invention, when UV curing coating is performed, even if the content of antibacterial substances is low compared to the total composition, high antibacterial activity can be exhibited in a short period of time due to the distribution characteristics of the antibacterial agent on the film surface. However, in the case of film extrusion as in the prior art, even if the content of the antibacterial material is high compared to the entire composition, high antibacterial activity cannot be achieved in a short period of time due to the distribution characteristics of the antibacterial agent being distributed throughout the film.

The thickness of the coating layer is not particularly limited and may be, for example, 2 to 10 μm, preferably 3 to 7 μm.

A first embossed layer 40 may be formed on one side of the antibacterial coating layer 10. The first embossed layer 40 can maximize the antibacterial and antiviral effects of the thermoplastic polyurethane film 100 by improving the surface area of the antibacterial coating layer 10.

The height of the first embossed layer 40 may be 20 to 50 μm, preferably 30 to 40 μm. Additionally, the first embossed layer may be formed in a pyramid or cone-shaped pattern. For example, the pattern may be in the shape of a triangular pyramid, square pyramid, or cone, but is not limited thereto. Preferably, the pattern may be in the shape of a square pyramid.

As shown in Figure 1, the thermoplastic polyurethane film 100 according to an embodiment of the present invention may further include a release paper layer 30, an antibacterial coating layer 10, a base layer 20, and a release paper layer. (30) It can be formed into a sequentially laminated structure.

Generally, one side of the film includes an adhesive surface to provide adhesiveness to the film. At this time, the release paper layer is placed on the adhesive layer of the film to prevent the adhesive layer from being contaminated by foreign substances in the external environment, and is peeled and removed before the film is applied to the adherend. Conventionally, the release paper layer coated with silicone, fluorine, etc. was used for adhesion and peeling from the adhesive surface, but the release paper layer used in the present invention adheres and peels off from the base layer 20 even without such coating treatment. Power is excellent.

According to one embodiment of the present invention, the release paper layer 30 may include a second embossing layer 50 on one surface that is in contact with the base layer 20. The release paper layer 30 including the second embossing layer 50 can exhibit excellent adhesion and peeling power to the antibacterial layer, which is an adherend, even without a separate release coating.

The thickness of the release paper layer may be 120 to 180 μm, preferably 140 to 160 μm, including the embossing layer.

The height of the second embossed layer 50 may be 10 to 30 μm, preferably 13 to 18 μm. Additionally, the second embossed layer 50 may be formed in a pattern shaped like a turned pyramid. For example, the bottom of the truncated pyramid may have a triangular, square, or circular shape, but is not limited thereto.

The thermoplastic polyurethane film of the present invention can further form a coating layer on the antibacterial coating layer 10.

The coating layer is a layer containing a calcium-based compound and is formed on the antibacterial coating layer 10 to increase the antibacterial and antiviral effects of the thermoplastic polyurethane film.

The coating layer may include a coating layer composition including an acrylic resin and a calcium-based compound.

The calcium-based compound can be used without limitation as long as it has antibacterial properties. For example, one or more calcium-based compounds selected from the group consisting of calcium hydroxide, calcium carbonate, hydroxyapatite, calcium phosphate, and calcium oxide may be used. Specifically, calcium hydroxide and calcium carbonate may be used, and the mixing ratio of calcium hydroxide and calcium carbonate may be 2:8 to 4:6 by weight.

The size of the calcium-based compound is not particularly limited. For example, the average particle size of the calcium-based compound may be 0.1 to 10 μm, preferably 1 to 9 μm, and more preferably 5 to 7 μm. Additionally, the specific surface area of the calcium-based compound may be 500 to 1500 g/m ² , preferably 800 to 1300 g/m ² .

In the coating layer, the content of the calcium-based compound is not particularly limited and, for example, may range from 5 to 10% by weight based on the total weight of the coating layer.

The acrylic resin may be used without limitation as long as it is commonly used for radical polymerization in the art. For example, one or more monomers and oligomers selected from the group consisting of silicone acrylate, urethane acrylate, epoxy acrylate, polyester acrylate, and polyether acrylate may be used. Specifically, a (meth)acrylate-based monomer may be used, and may include one or more of a (meth)acrylic group and a vinyl group.

In the coating layer, the content of the acrylic resin is not particularly limited and, for example, may range from 80 to 90% by weight based on the total amount of the coating layer.

In one embodiment of the present invention, the thermoplastic polyurethane film including the coating layer has excellent antibacterial activity of more than 99.99% against Staphylococcus aureus and Escherichia coli within 30 minutes, and excellent antiviral activity of more than 99.99% against SARS Coronavirus (SCoV). It was confirmed that it had .

Additionally, the present invention provides an antibacterial thermoplastic polyurethane fabric including the antibacterial thermoplastic polyurethane film.

The antibacterial thermoplastic polyurethane fabric can be used as a fabric for clothing, pouch shells, handle covers, or tablecloths.

Below, the present invention will be described in more detail through examples. However, the following examples are only for illustrating the present invention, and the scope of the present invention is not limited to the examples.

<Example 1> Preparation of thermoplastic polyurethane film

An antibacterial composition was prepared by mixing 99.0% by weight of thermoplastic polyurethane (TPU) resin, 0.5% by weight of zinc oxide, and 0.5% by weight of zeolite ion-exchanged with Zn ²⁺ ions based on the total weight of the antibacterial composition. At this time, the average diameter of zinc oxide is 40 nm, and the average diameter of zeolite ion-exchanged with Zn ²⁺ ions is 1 μm.

The antibacterial composition prepared by the above-described method was film extruded to prepare a thermoplastic polyurethane film with a thickness of 200 μm.

<Comparative Examples 1-1 to 1-4> Preparation of thermoplastic polyurethane film

Instead of thermoplastic polyurethane (TPU) resin, polyolefin elastomer (POE), polyvinyl chloride (PVC), linear low-density polyethylene (LLDPE), and ethylene-vinyl acetate are used. , EVA), the antibacterial films of Comparative Examples 1-1 to 1-4 were prepared in the same manner as in Example 1, respectively.

<Experimental Example 1> Evaluation of physical properties of film

In order to evaluate the physical properties of the thermoplastic polyurethane film, tensile recovery force (%), wrinkling resistance, elongation (%), and puncture resistance of the thermoplastic polyurethane films according to Example 1 and Comparative Examples 1-1 to 1-4 were measured by the following method. (Puncture Resistance, N), heat sealing (kgf/cm ² ), and surface friction coefficient (Friction Coefficient) were measured.

- Tensile resilience (%) was measured by stretching a 10x50mm thermoplastic polyurethane film three times and comparing it to the length of the specimen before tensioning.

- Crease resistance was measured by manually crumpling an 80x80mm thermoplastic polyurethane film, unfolding it, and visually observing the initial state and degree of deformation.

-Elongation (%) was measured according to the ASTM D882 standard, and the surface friction coefficient was measured according to the ASTM D1984 standard.

-Heat sealing strength (kgf/cm ² ) was measured according to the ASTM D903 standard after attaching two thermoplastic polyurethane films using a heat sealing process.

Properties Tensile resilience (%) elongation
(%) Puncture resistance
(N) Heat seal strength
(kgf/ ^cm2 ) surface friction coefficient Example 1 92 1000% or more 94.3 324 0.44 Comparative Example 1-1 61 710 71.7 211 0.56 Comparative Example 1-2 74 680 88.1 188 0.28 Comparative Example 1-3 21 580 42.8 143 0.23 Comparative Example 1-4 83 600 80.3 276 0.63

As shown in Table 1, the thermoplastic polyurethane film according to Example 1 had an excellent tensile recovery force of 92%, a high elongation of more than 1000%, and all mechanical properties such as puncture resistance, heat sealability, and surface friction coefficient. I could see that it was excellent. However, it was confirmed that the thermoplastic polyurethane films according to Comparative Examples 1-1 to 1-4 had a tensile recovery force of 83% or less and an elongation of 710% or less.

In addition, according to FIG. 2, it was confirmed that the thermoplastic polyurethane film according to Example 1 had excellent creasing resistance as little apparent deformation occurred even after being crumpled by hand. On the other hand, it was confirmed that the thermoplastic polyurethane films according to Comparative Examples 1-1 to 1-4 had poor wrinkle resistance, such as forming deep wrinkles.

<Examples 2-1 to 2-2> Preparation of thermoplastic polyurethane film

Example 1, except that 1% by weight of zinc oxide and 1% by weight of zeolite ion-exchanged with Zn ²⁺ ions were used as antibacterial agents instead of 0.5% by weight of zinc oxide and 0.5% by weight of zeolite ion-exchanged with Zn ²⁺ ions, respectively. Thermoplastic polyurethane films of Examples 2-1 and 2-2 were prepared in the same manner as above.

<Comparative Examples 2-1 to 2-3> Preparation of thermoplastic polyurethane film

Except that instead of 0.5% by weight of zinc oxide and 0.5% by weight of zeolite ion-exchanged with Zn ²⁺ ions, 1% by weight of copper powder, 1% by weight of silver nanopowder, and 1% by weight of zeolite powder ion-exchanged with silver ions were used as antibacterial agents. Then, thermoplastic polyurethane films of Comparative Examples 2-1 to 2-3 were manufactured in the same manner as Example 1.

The average particle diameter of the copper powder used at this time was 10 um, the average particle diameter of the silver nanopowder was 50 nm, and the particle size of the zeolite powder ion-exchanged with silver ions was 1 um.

<Experimental Example 2> Appearance discoloration evaluation

After storing the thermoplastic polyurethane films prepared according to Examples 2-1 to 2-2 and Comparative Examples 2-1 to 2-3 in a constant temperature and humidity chamber at 35°C and 50% relative humidity for 7 days, an apparent color change was observed. evaluated.

According to Figure 3, it was confirmed that the thermoplastic polyurethane films according to Examples 2-1 and 2-2 showed almost no change in color in appearance even after 7 days. However, the thermoplastic polyurethane films according to Comparative Examples 2-1 to 2-3 showed discoloration in appearance due to oxidation of the antibacterial agent component, especially Comparative Examples 2-1 to 2-2 containing copper powder and silver nanopowder. It was confirmed that the thermoplastic polyurethane film showed significant color change.

<Example 3> Preparation of thermoplastic polyurethane film containing antibacterial coating layer

3-1. Preparation of thermoplastic polyurethane substrate layer

A thermoplastic polyurethane (TPU) resin was extruded to prepare a thermoplastic polyurethane base layer with a thickness of 200 ㎛ and a hardness of 85 degrees.

3-2. Preparation of composition for antibacterial coating

After preparing an antibacterial coating composition by mixing 99% by weight of UV curable resin, 0.5% by weight of zinc oxide, and 0.5% by weight of zeolite ion-exchanged with Zn ²⁺ ions based on the total weight of the antibacterial coating composition, the thermoplastic poly It may be formed by applying it to a urethane substrate and then curing it by irradiating UV. The UV curable resin may include a radical polymerization acrylic resin as an oligomer, 95% by weight as a monomer, 3% by weight as a photopolymerization initiator, and 2% by weight as an additive.

<Example 4> Preparation of thermoplastic polyurethane film including a coating layer

A coating layer composition was prepared by mixing 90% by weight of polymethacrylate resin and 95% by weight of a calcium-based compound based on the total weight of the coating layer composition. At this time, the calcium-based compound was used by mixing calcium hydroxide and calcium carbonate at a weight ratio of 3:7. The average particle size of the calcium hydroxide and calcium carbonate was 6㎛, and the specific surface area was 1000g/m ² .

The coating layer composition was applied on the antibacterial layer of the thermoplastic polyurethane film prepared in Example 3 and subjected to UV curing coating to prepare a thermoplastic polyurethane film including a coating layer and an antibacterial layer. At this time, the thickness of the coating layer is 5㎛.

<Experimental Example 3> Antibacterial and antiviral evaluation

A specimen measuring 5cm (width) Sex was measured.

Thickness of each layer (㎛) Antibacterial activity (%); 30 minutes Antiviral power (%); 30 minutes antibacterial layer coating layer Staphylococcus aureus E. coli COVID-19 virus
SARS-CoV-2 Example 1 200 0 0 0 0 Example 4 200 5 99.9 or higher 99.9 or higher 99.99 or higher

As shown in Table 2, the thermoplastic polyurethane film containing the coating layer according to Example 4 has excellent antibacterial activity of more than 99.99% against Staphylococcus aureus and Escherichia coli within 30 minutes, and more than 99.99% against SARS Coronavirus (SCoV). It was confirmed to have excellent antiviral properties.

100: thermoplastic polyurethane film
10: Antibacterial coating layer
20: base layer
30: Release paper layer
40: first embossing layer
50: second embossing layer

Claims (16)

A base layer made of thermoplastic polyurethane resin; and
An antibacterial coating layer formed on the base layer, including an antibacterial agent and having an embossing layer,
The antibacterial agent contains zinc oxide, zeolite, or both,
It further includes a coating layer containing a calcium-based compound formed on the antibacterial coating layer,
The calcium-based compound is an antibacterial thermoplastic polyurethane film, wherein the calcium-based compound is at least one selected from the group consisting of calcium hydroxide, calcium carbonate, hydroxyapatite, calcium phosphate, and calcium oxide. According to paragraph 1,
The zinc oxide is an antibacterial thermoplastic polyurethane film having an average diameter of 8 to 100 nm. According to paragraph 1,
An antibacterial thermoplastic polyurethane film, wherein the zeolite is ion-exchanged with antibacterial metal ions. According to paragraph 3,
The antibacterial metal ions include zinc (Zn), silver (Ag), copper (Cu), mercury (Hg), tin (Sn), lead (Pb), bismuth (Bi), cadmium (Cd), chromium (Cr), An antibacterial thermoplastic polyurethane film containing one or more metal ions selected from the group consisting of calcium (Ca), sodium (Na), cesium (Cs), potassium (K), and magnesium (Mg). According to paragraph 3,
The zeolite is an antibacterial thermoplastic polyurethane film having an average diameter of 0.2 to 10 ㎛. According to paragraph 1,
The antibacterial agent is an antibacterial thermoplastic polyurethane film in which zinc oxide and zeolite are mixed at a weight ratio of 1:0.2 to 5. According to paragraph 1,
Has an antibacterial activity of more than 99.99% against Gram-positive bacteria and Gram-negative bacteria according to JIS Z 2801 standard,
An antibacterial thermoplastic polyurethane film with an antiviral activity of more than 99.99% against SARS Coronavirus (ScoV) according to ISO 21702 standards. In clause 7,
An antibacterial thermoplastic polyurethane film in which the antibacterial and antiviral activities appear within 1 hour. According to paragraph 1,
The embossed layer includes a pyramid or cone-shaped pattern,
An antibacterial thermoplastic polyurethane film having a height of 20 to 50 μm. According to paragraph 1,
An antibacterial thermoplastic polyurethane film further comprising a release paper layer. According to clause 10,
The release paper layer is an antibacterial thermoplastic polyurethane film having an embossed layer on one side. According to clause 11,
The embossed layer includes a truncated pyramid-shaped pattern,
An antibacterial thermoplastic polyurethane film having a height of 10 to 30 μm. According to paragraph 1,
The antibacterial coating layer is an antibacterial thermoplastic polyurethane film formed by UV curing coating. delete An antibacterial thermoplastic polyurethane fabric comprising the antibacterial thermoplastic polyurethane film according to any one of claims 1 to 13. According to clause 15,
Antibacterial thermoplastic polyurethane fabric used as a fabric for clothing, pouch shells, handle covers, or tablecloths.