KR102846107B1 - Ourdoor transparent patch with skin moisturizing improvement effect and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a transparent patch for outdoor use, which comprises a skin contact layer having adhesiveness to a skin surface and containing a hydrophilic resin and a skin-improving functional compound, a UV-blocking layer having UV-blocking functionality located on the upper portion of the skin contact layer, and a surface layer located on the upper portion of the UV-blocking layer, and which has visible light transmission characteristics and a skin moisturizing improvement effect, and a method for manufacturing the same.

Description

Outdoor transparent patch with skin moisturizing improvement effect and manufacturing method thereof {OURDOOR TRANSPARENT PATCH WITH SKIN MOISTURIZING IMPROVEMENT EFFECT AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a transparent patch for outdoor use having a multilayer structure including a transparent film having a UV-blocking function, which maintains a UV-blocking function while being attached and detached without irritating the skin, has a transparent property and thus has excellent appearance characteristics while having a skin moisturizing improvement effect, and a method for manufacturing the same.

When engaging in outdoor activities, it is common to wear sunscreen, UV-blocking clothing, and hats to block UV rays that can have a negative impact on the skin.

Ultraviolet rays, which are the main cause of various skin symptoms and diseases, are blocked by directly blocking sunlight or by using cosmetics that specifically block ultraviolet rays, such as those containing sunscreen.

Ultraviolet rays are electromagnetic waves with a wavelength range of 200 nm to 400 nm. Depending on the effect they have on living organisms, the ultraviolet wavelength range can be divided into ultraviolet A (UVA, 320 nm to 400 nm), ultraviolet B (UVB, 320 nm to 280 nm), and ultraviolet C (UVC: 290 nm to 200 nm).

UV-C, which has the shortest wavelength, is mostly blocked by the ozone layer in the Earth's stratosphere, and UV-A and UV-B, which reach the Earth's surface, have a significant impact on outdoor activities.

UVA rays penetrate the dermis of the skin and induce the production of reactive oxygen species (ROS), which can cause DNA damage, erythema, inflammatory reactions, skin aging, and skin cancer. UVB rays penetrate the epidermis of the skin and are known to cause erythema, freckles, and edema. Therefore, the importance of UV protection is being highlighted in terms of skin beauty and health.

Sunscreens include physical sunscreens that reflect and scatter ultraviolet rays to prevent them from reaching the skin, and chemical sunscreens that react with ultraviolet rays on the skin surface to block ultraviolet rays before they reach the skin directly. Sunscreens are manufactured into liquid or solid sunscreen cosmetics by dissolving and dispersing sunscreens in a solvent.

Meanwhile, when engaging in outdoor activities such as golf, tennis, or mountain climbing, or in the summer, the skin sweats a lot, so there were problems such as the sunscreen being removed by sweat, reducing the sunscreen effect, or the sunscreen getting into the eyes along with sweat, causing pain. Recently, a sunscreen patch that sticks to the skin has been developed and is widely used.

Korean Patent No. 2242158 relates to an outdoor patch for blocking ultraviolet rays, and comprises a base layer and an adhesive layer formed on one surface of the base layer, wherein the adhesive layer contains niacinamide, adenosine, sodium hyaluronate, propolis extract, hydrolyzed collagen, and purslane extract, thereby providing an ultraviolet ray blocking effect, while also having a skin moisturizing effect, a skin cooling effect, and excellent skin adhesion, as well as the effect of not causing skin trouble.

Korean Patent Publication No. 2020-0053432 relates to a UV-blocking patch and an application method thereof, and discloses a UV-blocking patch comprising a UV-blocking layer which is a porous substrate formed of first nanofibers having a hydrophilic resin and a UV-blocking agent, and a shape-retaining layer formed of a mixed resin including an elastic resin and a strength-reinforcing resin and provided on one side of the UV-blocking layer, so that the UV-blocking agent does not come into direct contact with the skin, and does not peel off or impede the movement of the adhered portion even when physically stimulated, and has transparency so that the visibility of the adhered portion is not reduced when attached to the skin.

However, the above technology does not disclose a transparent patch for UV protection that is transparent and allows the skin to be reflected, has UV protection effects suitable for use during outdoor activities, has adhesiveness and excellent durability, and supplies effective ingredients with skin-improving functions such as skin moisturizing or skin whitening to the skin while attached.

Therefore, there is a need for the development of a UV blocking patch that blocks UV rays, allows visible light to pass through, has a transparent property that allows the skin to be seen through the patch, has strong durability that prevents the patch from falling off or breaking even when the patch is used for outdoor activities while attached to the skin, and has skin improvement functionality.

Republic of Korea Patent No. 2242158 (April 14, 2021) Republic of Korea Patent Publication No. 2020-0053432 (May 18, 2020)

The purpose of the present invention is to provide a transparent patch for outdoor use that has an excellent UV blocking effect without direct contact of UV blocking ingredients that may cause skin irritation with the skin.

The present invention aims to provide a transparent patch for outdoor use having a skin improvement effect by including an active ingredient having a skin improvement function on the surface of the patch in contact with the skin.

The present invention aims to provide a transparent patch for outdoor use that has excellent elasticity and flexibility, so that it does not peel off even when subjected to physical stimulation such as movement, and has strong durability, so that there is no risk of breakage or fracture.

In addition, the present invention aims to provide a UV-blocking functional outdoor transparent patch having low UV transmittance and high visible light transmittance, so that when attached to the skin, the skin has the effect of shining through the patch.

In order to solve the above-described problem, a transparent patch according to the present invention comprises: a skin contact layer having adhesiveness to a skin surface and including a hydrophilic resin and a skin-improving functional compound; a UV blocking layer having UV blocking functionality located on the upper portion of the skin contact layer; and a surface layer located on the upper portion of the UV blocking layer; and having visible light transmission characteristics.

In the present invention, the hydrophilic resin may include a polyvinyl alcohol resin, and the surface layer may include a polyolefin polymer.

In the present invention, the outdoor transparent patch may include a triple-layer structure having the skin contact layer in the form of a film, the ultraviolet ray blocking layer, and the surface layer.

In the present invention, the skin contact layer may have at least one skin improvement function selected from the group consisting of skin moisturizing, skin whitening, skin wrinkle improvement, skin elasticity improvement, skin erythema improvement, skin aging prevention, melanin formation inhibition, and skin soothing.

In the present invention, the skin improvement functional compound may be included in an amount of 10 to 15 parts by weight based on 100 parts by weight of the hydrophilic resin.

In the present invention, a transparent patch for outdoor use, wherein the ultraviolet ray blocking component comprises at least one selected from the group consisting of a physical ultraviolet ray blocking agent and a chemical ultraviolet ray blocking agent.

In the present invention, the surface layer may have a tensile strength of 0.5 to 2 N/mm ² .

In the present invention, the UV-blocking ingredient may include at least one selected from the group consisting of drometrizole trisiloxane (DTS), zinc oxide (ZnO), methylene bis-benzotriazolyl tetramethyl-butylphenol (MBBT), and bis-ethylhexyloxy methoxyphenyl triazine (BEMT).

In the present invention, the skin-improving functional compound may include one or more skin-improving functional compounds selected from the group consisting of water-soluble pearl powder and aqueous solutions thereof.

In the present invention, the skin-improving functional compound may include one or more skin-improving functional compounds selected from the group consisting of kelp extract and aqueous solutions thereof.

In the present invention, the skin contact layer further includes an adhesive aid, and the adhesive aid may include a porous PDMS flake having micropores formed on the surface and a mixture of polyvinyl alcohol, hyaluronic acid, and vinyl acetate copolymer supported in the micropores.

The present invention also provides a method for manufacturing a transparent patch for outdoor use, comprising the steps of: a) preparing a polyolefin-based polymer film; b) forming a UV-blocking film layer including a UV-blocking component and a polyurethane resin hydrogel on the lower portion of the polyolefin-based polymer film of step a); c) forming a skin-contacting layer including polyvinyl alcohol and a skin-improving functional compound on the lower portion of the UV-blocking film layer formed in step b); and d) adding a release film on the lower portion of the skin-contacting layer manufactured in step c).

In the above manufacturing method, the ultraviolet ray blocking component of step b) may be characterized by performing a step of irradiating the ultraviolet ray for 10 to 15 minutes before mixing and placing it in a chamber filled with carbon dioxide gas at 1 to 1.2 bar and mixing it.

The outdoor transparent patch according to the present invention has an excellent UV protection effect on the skin because the UV protection ingredient does not come into direct contact with the skin.

The present invention has a skin improvement effect by including an active ingredient having skin improvement functionality on the surface of the patch that comes into contact with the skin.

The present invention has excellent elasticity and flexibility, so it does not peel off even when subjected to physical stimulation such as movement, and has strong durability, so it is not easily broken or fractured.

In addition, the present invention has low ultraviolet ray transmittance and high visible light transmittance, so that when attached to the skin, the skin has the effect of shining through the patch.

The present invention also has strong durability in that three layers made of different materials can be maintained as a single patch without interlayer separation even when subjected to physical stimulation such as movement.

FIG. 1 is a vertical cross-sectional view of a transparent patch according to one embodiment of the present invention.
FIG. 2 is a photograph of a transparent patch according to one embodiment of the present invention.

Hereinafter, each component of the present invention will be described in more detail so that a person having ordinary skill in the art to which the present invention pertains can easily practice it; however, this is only an example, and the scope of the rights of the present invention is not limited by the following contents.

As used herein, the terms "preferred" or "preferably" refer to embodiments of the invention that have particular advantages under specific conditions. However, other embodiments may also be preferred under the same or different conditions. Furthermore, the fact that one or more preferred embodiments are preferred does not imply that other embodiments are not useful, nor does it exclude other embodiments within the scope of the invention.

The term "comprises" as used herein is used to list materials, compositions, devices, and methods useful in the present invention, but is not limited to the listed examples.

In particular, the term "includes" in the present invention refers to various states such as a state including a component as it is, a state processed using a component as a precursor, a state satisfying a component after processing, etc., and is not limited to the listed examples.

The present invention relates to a transparent patch for outdoor use with UV protection functionality that is attached to the skin to block UV rays during outdoor activities such as golf, tennis, and mountaineering, and comprises: i) a UV protection layer that prevents direct contact between the skin and a UV protection ingredient while having a high UV protection effect; ii) a surface layer that functions as a support layer and provides solid durability due to excellent flexibility and elasticity; and iii) a skin adhesive layer that has excellent adhesion to the skin while not causing skin irritation when peeled off from the skin. Each layer has a transparent characteristic, so that even in a laminated state, it has a high visible light transmittance, thereby having an effect of allowing the skin to be seen through, and it is characterized by having an effect of preventing separation between layers even in a state where each layer containing different ingredients is laminated.

Specifically, the outdoor transparent patch according to the present invention comprises a skin contact layer having adhesiveness to a skin surface and containing a hydrophilic resin and a skin-improving functional compound, a UV-blocking layer having UV-blocking functionality located on the upper portion of the adhesive layer, and a surface layer located on the upper portion of the UV-blocking layer, and having visible light transmission characteristics.

The transparent patch for outdoor use according to the present invention has a triple-layer structure including a film-shaped skin contact layer, a UV blocking layer, and a surface layer, and is characterized by having a UV blocking function and a skin improvement function in the skin contact area, and is not easily removed from the skin even when the patch's attachment surface and surrounding area move, and the skin is transparently visible.

Below, the configuration of the present invention is described in more detail.

1. Skin contact layer

The transparent patch for outdoor use according to the present invention is characterized by having a layer that is in direct contact with the skin, having adhesiveness to the skin surface, and having a skin improvement function while in contact with the skin.

Specifically, the skin contact layer is characterized by including a hydrophilic resin and a skin-improving functional compound, while improving adhesion to the skin surface.

Since the human skin surface contains sebum and the epidermis is lipophilic, it is configured so that the hydrophilicity is not too high, and so that excellent adhesion to the skin surface can be maintained.

The above hydrophilic resin is used to uniformly contain a hydrophilic component among skin-improving functional compounds within the skin contact layer and to prevent unstable conditions such as phase separation from occurring.

The hydrophilic resin described above is not a material harmful to the skin, and any material can be used within the scope that does not deviate from the purpose of the present invention, but most preferably, polyvinyl alcohol resin can be used.

It is composed of polyvinyl alcohol resin with strong polar hydroxyl groups so that it can be uniformly mixed with skin-improving functional compounds, and has transparent properties so that visible light can be transmitted and the skin can be seen through the transparent patch.

The above skin contact layer is characterized by further including a skin improvement functional compound, thereby having skin improvement functionality. The skin improvement functional compound may be included in an amount of 10 to 15 parts by weight based on 100 parts by weight of the polyvinyl alcohol resin.

More preferably, it may be included in an amount of 11 to 13 parts by weight, and most preferably, it may be included in an amount of 12.5 parts by weight.

If it is included in an amount exceeding the above content, there may be a problem that the formulation is unstable and the skin improvement functional compound is eluted during storage, and if it is added in an amount less than the above content, there may be a problem that the skin improvement function is minimal.

The above content values limit the minimum and maximum addition amounts regardless of the type of skin-improving functional compound, and each content value may be changed somewhat differently depending on the type of each compound.

Specifically, the skin contact layer may have one or more skin improvement functions selected from the group consisting of skin moisturizing, skin whitening, skin wrinkle improvement, skin elasticity improvement, skin erythema improvement, skin aging prevention, and melanin formation inhibition. The skin improvement function refers to having a function that can improve the problematic condition of the skin to a better state.

More specifically, it may have one or more skin improvement functions selected from the group consisting of skin moisturizing and skin whitening.

The above skin improvement functional compound can be appropriately selected and used in the field of cosmetics such as cosmetic compositions and mask packs, as needed.

Specifically, it may include one or more skin-improving functional compounds selected from the group consisting of water-soluble pearl powder and its aqueous solution, and kelp extract and its aqueous solution.

The above-mentioned water-soluble pearl powder and its aqueous solution are manufactured by dissolving calcium carbonate and organic substances from the pearl powder portion and freeze-drying the solution to minimize the loss of functional organic components. As it is ionized and the loss of organic substances is minimized, it inhibits the activity of tyrosinase, thereby suppressing melanin production, resulting in an excellent whitening effect. It also inhibits NO production, thereby suppressing inflammation, resulting in an excellent skin soothing (anti-inflammatory) effect. It also promotes collagen production, resulting in an excellent skin aging inhibition effect. Therefore, by including it in a skin stimulation layer, it can have skin improvement functions such as skin whitening, skin soothing (anti-inflammation), and skin aging prevention (inhibition).

Regarding the above water-soluble pearl powder and its aqueous solution, reference may be made to the contents of Republic of Korea Patent No. 1771055.

Kelp is a brown seaweed that contains useful ingredients such as alginic acid and fucoidan, and kelp extract is known to have antioxidant, antibacterial, anti-inflammatory, anti-aging, and anti-melanin formation effects. Therefore, when it is added to the skin stimulation layer and applied to the skin, it can have skin improvement functions such as preventing skin aging, inhibiting melanin formation, and soothing the skin.

The thickness of the above skin contact layer may be 100 to 500 μm.

If it is thinner than the above thickness, there is a problem of reduced adhesion to the skin, and if it is thicker than the above thickness, there is a problem of increased manufacturing cost without any skin improvement functional effect or improved or enhanced adhesion effect.

Meanwhile, the skin contact layer may further include an adhesive aid to improve adhesion to the skin.

The above adhesive aid is composed of a porous PDMS (Polydimethylsiloxane) flake having micropores formed on the surface and a mixture of polyvinyl alcohol, hyaluronic acid, and vinyl acetate copolymer supported in the micropores, and the porous PDMS particles in the shape of flakes having micropores formed are prepared and immersed in an aqueous solution in which polyvinyl alcohol, hyaluronic acid, and vinyl acetate copolymer are dispersed to prepare the adhesive aid.

The above adhesive aid is released from the micropores 1 to 3 hours after the transparent patch is attached to the skin due to body temperature, and has the effect of maintaining and improving adhesiveness.

When the adhesive auxiliary agent is further included, it may be included in an amount of 3 to 5 parts by weight based on 100 parts by weight of the hydrophilic resin.

If added in an amount greater than the above content, the content of the skin-improving functional compound becomes relatively small, resulting in a problem of minimal skin-improving effect. If added in an amount less than the above content, even if added, the effect of improving adhesiveness becomes minimal, resulting in a problem of uselessness.

2. UV protection layer

The UV blocking layer is a separate layer located on top of the skin contact layer, and is configured to have a transparent patch with UV blocking functionality, including a UV blocking ingredient, while not making direct contact with the skin. It is configured to be located below the surface layer so as not to be exposed to the outside, thereby preventing loss of the UV blocking ingredient or damage to the UV blocking layer.

The above UV-blocking layer includes a UV-blocking ingredient and a polyurethane resin.

The above UV-blocking component can be formed as a separate layer from the skin contact layer by mixing it with a prepolymer in which diisocyanate and polyol are mixed before being synthesized into a polyurethane resin and then being synthesized into a polyurethane resin to form a UV-blocking layer.

The above UV-blocking ingredient has UV-blocking functionality and may be used without particular limitations within a scope that does not deviate from the purpose of the present invention. It may include one or more selected from the group consisting of physical UV-blocking agents and chemical UV-blocking agents, and it is also possible to use them in combination as needed.

Physical sunscreens include, for example, inorganic chemicals such as zinc oxide and titanium dioxide, and can be formed into a complex form of sunscreen by further processing the inorganic chemicals as needed.

Any chemical sunscreen that can be used as a cosmetic can be used. For example, it can be any one selected from the group consisting of drometrizole trisiloxane (DTS), zinc oxide (ZnO), methylene bis-benzotriazolyl tetramethyl-butylphenol (MBBT), and bis-ethylhexyloxy methoxyphenyl triazine (BEMT).

More preferably, it may include bis-ethylhexyloxy methoxyphenyl triazine (BEMT). When included, it has the effect of blocking both the UVA and UVB regions, and can be configured to have a UV blocking function over a wider wavelength range.

The above UV blocking ingredient may be included in an amount of 10 to 20 parts by weight based on 100 parts by weight of the hydrophilic resin.

If it is included in an amount greater than the above content, there is a problem that the affinity between the surface layer located on the upper side of the UV-blocking layer and the skin contact layer located on the lower side is reduced, and thus separation between layers may occur after manufacturing the patch. If it is included in an amount less than the above content, there is a problem that the UV-blocking effect is minimal.

The above polyurethane resin is formed into a polyurethane resin using a hardener in a prepolymer state in which diisocyanate and polyol are mixed. Any polyurethane resin that can be used in cosmetics, mask packs, etc. on the market can be used without particular limitations. In order to have a uniform ultraviolet ray blocking effect in all areas of the transparent patch, it is uniformly mixed with a UV ray blocking component in a prepolymer state, and then manufactured into a film to manufacture a UV ray blocking layer.

For example, polyurethane resin can be manufactured using methylene diphenyl diisocyanate (MDI) and ethylene glycol.

Meanwhile, the ultraviolet ray blocking layer according to the present invention is capable of selectively blocking ultraviolet rays, and may have a partial blocking effect on short-wavelength visible light, i.e., visible light in the region adjacent to the ultraviolet ray wavelength, but is characterized by being transparent to visible light.

Specifically, the transparent patch has a transparency to visible light, so that the skin to which the transparent patch is attached has the effect of reflecting light on top of the transparent patch. More specifically, the visible light transmittance may be 75% or greater.

3. Surface layer

The surface layer refers to the outer surface of the outdoor transparent patch, and is the layer located on the surface exposed to the outside.

The surface layer is a rigid layer that prevents damage from external physical and chemical stimuli, and plays a role in preventing damage to the UV-blocking layer and skin adhesive layer, which have relatively low rigidity.

Meanwhile, the surface layer is characterized by being composed of a strong material so as not to be easily damaged, while also having elasticity and flexibility so that the user does not feel discomfort even when moving while attached to the human body.

More specifically, the surface layer may have a tensile strength of 0.5 to 2 N/mm ² . More preferably, it may have a tensile strength of 1.0 to 2.0 N/mm ² .

If the tensile strength is greater than the above value, the user may feel discomfort in moving while the transparent patch is attached, and if the tensile strength is less than the above value, the function of supporting the ultraviolet ray blocking layer and skin contact layer may be reduced, and there is a problem that it is easy to be broken or damaged by external stimuli.

The surface layer may be configured to include a polyolefin polymer, and most preferably, may include at least one selected from the group consisting of polyethylene and polypropylene.

The above surface layer has a film shape with a thickness of 100 to 500 ㎛. If it is thicker than the above thickness, there is a problem that the movement of the user while attached is unnatural and the feeling of use is reduced. If it is thinner than the above thickness, there is a problem that the patch may easily fall off from the skin or breakage of the patch itself may occur when there is a lot of movement.

The surface layer also preferably has transparency to be suitable for use in the outdoor transparent patch according to the present invention. It is preferable to have transparent properties so that the transparency of the transparent patch manufactured by laminating it into three layers is not reduced.

4. Manufacturing method

A method for manufacturing a transparent patch for outdoor use according to the present invention comprises the steps of: a) preparing a polyolefin-based polymer film; b) forming an ultraviolet-blocking film layer containing an ultraviolet-blocking component and a polyurethane resin on the lower portion of the polyolefin-based polymer film of step a); c) forming a skin-contacting layer containing polyvinyl alcohol and a skin-improving functional compound on the lower portion of the ultraviolet-blocking film layer formed in step b); and d) adding a release film on the lower portion of the skin-contacting layer manufactured in step c).

The above step a) is a step for preparing a film that constitutes a surface layer. Before forming a UV-blocking layer on one surface of the film, unnecessary contaminants, etc. are removed from the surface to enhance the adhesive strength between the two layers. If necessary, degreasing and washing processes may be performed.

The step b) above is a step of forming a UV-blocking film layer containing a UV-blocking component and a polyurethane resin on one side of the polyolefin-based polymer film of the step a), wherein a prepolymer is prepared by mixing a UV-blocking component, diisocyanate, and polyol, and then the prepolymer is applied to one side (lower side) of the polyolefin-based polymer film to form a film-shaped layer.

At this time, before manufacturing the prepolymer in step b), the UV-blocking component can be subjected to a pretreatment process in advance to improve the compatibility of the UV-blocking component and the polyurethane resin. By performing a step of irradiating the UV-blocking component with infrared rays for 10 to 15 minutes before mixing and placing it in a chamber filled with carbon dioxide gas at 1 to 1.2 bar and mixing it, the compatibility with the polyurethane resin is improved, and as a result, the adhesive strength between the surface layer and the skin-adhesive layer is excellent, so that delamination does not occur even in a triple-layer structure.

The above step c) is a step of forming a skin contact layer containing polyvinyl alcohol and a skin-improving functional compound on the lower side of the ultraviolet ray blocking film layer formed in the above step b), and is a step of forming a skin contact layer on the opposite side (lower side of the ultraviolet ray blocking layer) of the side where the ultraviolet ray blocking layer is in contact with the surface layer. The skin-improving functional compound and polyvinyl alcohol are mixed to form the ultraviolet ray blocking layer in the form of a film.

Lastly, step d) is a step of adding a release film to the lower part of the skin contact layer manufactured in step c), and is a step of adding a release film to the lower part of the transparent patch for outdoor use, i.e., the skin contact layer, to prevent a decrease in adhesive strength.

Any type of film suitable for use in mask packs can be used without any special restrictions.

Hereinafter, the present invention will be described based on examples.

<Example 1>

Bis-ethylhexyloxy methoxyphenyl triazine (BEMT, Tinosorb S), methylenediphenyl diisocyanate, and ethylene glycol were mixed to prepare a prepolymer, which was then applied to one side of a prepared polypropylene film (surface layer, thickness: 300 μm) to form a UV-blocking layer with a thickness of 450 μm.

At this time, bis-ethylhexyloxyphenol methoxyphenyl triazine is added in an amount of 15 parts by weight based on 100 parts by weight of polyurethane resin.

On the opposite side of the UV-blocking layer in contact with the film, 100 parts by weight of polyvinyl alcohol resin and 5 parts by weight of water-soluble pearl powder (manufactured according to Korean Patent Registration No. 1771055) were mixed to produce a skin-contacting layer having a thickness of 300 μm, and a release film was added underneath to produce a triple-layered UV-blocking functional outdoor transparent patch.

<Example 2>

Porous PDMS flakes with micropores formed on the surface were prepared using a composition mixing PDMS and silica particles. Separately, polyvinyl alcohol, hyaluronic acid, and vinyl acetate copolymer were dissolved in purified water as a solvent at a weight ratio of 2:3:1 and mixed until uniformly mixed.

In the above Example 1, the skin contact layer was manufactured in the same manner as Example 1, except that 4 parts by weight of an adhesive aid was added based on 100 parts by weight of polyvinyl alcohol resin.

<Example 3>

In the above Example 1, before preparing a prepolymer from bis-ethylhexyloxyphenol methoxyphenyltriazine, a step of irradiating it with infrared rays for 15 minutes and mixing it in a chamber filled with 1 bar of carbon dioxide gas was performed, and then a polyurethane prepolymer was prepared using the same method as Example 1.

<Comparative Example 1>

In the above Example 1, the same method as Example 1 was used except that carboxymethyl cellulose was used instead of the polyvinyl alcohol resin included in the skin contact layer.

<Comparative Example 2>

In the above Example 1, the skin contact layer was manufactured in the same manner as Example 1, except that hyaluronic acid was used instead of the polyvinyl alcohol resin included in the skin contact layer.

<Comparative Example 3>

In the above Example 1, it was manufactured in the same manner as Example 1, except that polyvinylpyrrolidone was used instead of the polyvinyl alcohol resin included in the skin contact layer.

<Comparative Example 4>

In the above Example 1, the skin contact layer was manufactured in the same manner as in Example 1, except that polyurethane synthesized with methylene diphenyl diisocyanate and ethylene glycol was used instead of the polyvinyl alcohol resin included in the skin contact layer.

Comparative Example 5

In the above Example 1, the water-soluble pearl powder included in the skin contact layer was manufactured in the same manner as in Example 1, except that 1 part by weight was used instead of 5 parts by weight.

<Comparative Example 6>

In the above Example 1, the water-soluble pearl powder included in the skin contact layer was manufactured in the same manner as in Example 1, except that 10 parts by weight was used instead of 5 parts by weight.

Comparative Example 7

In the above Example 1, the UV blocking layer was manufactured in the same manner as in Example 1, except that 20 parts by weight of bis-ethylhexyloxyphenol methoxyphenyl triazine was used instead of 15 parts by weight.

Comparative Example 8

In the above Example 1, the UV blocking layer was manufactured in the same manner as in Example 1, except that polyvinyl alcohol was used instead of the polyurethane resin included in the UV blocking layer.

<Comparative Example 9>

In the above Example 1, the UV blocking layer was manufactured in the same manner as in Example 1, except that polypropylene was used instead of the polyurethane resin included in the UV blocking layer.

Comparative Example 10

In the above Example 1, the surface layer was manufactured in the same manner as in Example 1, except that a polyurethane film was used.

<Experimental Method>

1. UV protection rate (KS K 0850:2019)

The UV protection factor (SPF) values of the patch samples according to the examples and comparative examples were measured using a UV protection factor measuring device (SPF-290AS, solar light). Measurements were performed 10 times at different locations within the patch, and the average values are shown in Table 1 below.

2. Transparency Evaluation

The visible light transmittance of the patch specimens according to the examples and comparative examples was measured using an ultraviolet-visible-near-infrared (UV-VIS-NIR) spectrophotometer. The measurements were performed 10 times at different locations within the patch without air bubbles, and the average values are shown in Table 1.

3. Adhesion evaluation

Adhesion evaluation of patch specimens according to examples and comparative examples was conducted on 50 adult men and women in their 20s to 40s without any specific skin disease.

The patch specimen was attached to the front of the right thigh and run on a treadmill for 90 minutes. If the patch was detached from the skin during the process, it was evaluated as X. If the patch was not detached but there was a part that was detached or the adhesive strength was minimal, it was evaluated as △. If the patch was completely attached to the skin, it was evaluated as O (Adhesion strength evaluation 1).

Next, for the patch specimens evaluated as O, skin irritation upon peeling was evaluated. If skin irritation occurred, it was evaluated as X, and if it peeled off smoothly without skin irritation, it was evaluated as O (adhesion evaluation 2).

4. Durability Evaluation

Patch specimens according to examples and comparative examples were attached to an artificial skin model, and attachment and peeling were repeated 10 to 50 times, and the number of times the specimens were broken or damaged was recorded (durability evaluation 1).

If the specimen was not broken or damaged, the attachment and peeling were repeated 20 more times, and then the presence of delamination between the three layers was checked. If delamination occurred, it was evaluated as X, and if there was no change, it was evaluated as O (durability evaluation 2).

5. Skin improvement functionality evaluation

Fifty adult men and women in their 20s and 40s without any specific skin disease were tested, and patch specimens according to the examples and comparative examples were attached for 6 hours, and then the skin improvement effect was evaluated.

We conducted an evaluation to see if there was any improvement in skin hydration.

The evaluation was given on a scale of 0 (no difference) to 5 (moisturizing effect maintained even after removal of the patch).

6. Usability Evaluation

Fifty adult men and women in their 20s and 40s without specific skin conditions were targeted, and patches according to the examples and comparative examples were attached to the skin to evaluate the usability of the patches. The patches were flexibly stretched and deformed according to movement, and the average was calculated based on the comfort rating out of 5 points (discomfort or severe foreign body sensation: 1 point ~ no discomfort: 5 points).

Example Comparative example 1 2 3 1 2 3 4 5 6 7 8 9 10 ultraviolet rays
Blocking rate (%) 92 90 91 91 84 88 88 91 90 91 90 91 91 Visible light
Transmittance (%) 90 86 79 66 89 62 79 88 86 76 86 86 79 Adhesion Evaluation 1 △ O △ △ X X △ △ △ △ △ △ △ Adhesion Evaluation 2 - O - - - - - - - - - - - Durability Evaluation 1 45 44 48 12 5 45 39 46 23 43 31 8 22 Durability Evaluation 2 X X O X X O X O O X X X X Skin improvement functionality 5 5 4 4 5 2 3 2 5 5 4 2 2 Usability evaluation 4 5 4 3 2 2 1 4 3 5 4 1 1

Referring to Table 1 above, it can be confirmed that the patch according to the embodiment has a high UV blocking rate and high visible light transmittance, thereby being transparent.

Moreover, in the case of the embodiment, it can be confirmed that the adhesiveness and durability are excellent, and the skin improvement effect due to the skin improvement functional active ingredient included in the skin contact layer is excellent, and the feeling of use is also excellent.

Meanwhile, in Example 2, it can be confirmed that the skin contact layer containing more adhesive additives has better adhesion to the skin compared to Examples 1 and 3, and in the case of Example 3, it can be confirmed that interlayer delamination is suppressed, and thus it can be confirmed that the durability of the multilayer structured film is particularly excellent.

10: Surface layer
20: UV protection layer
30: Skin contact layer

Claims (11)

A skin contact layer having adhesiveness to a skin surface and comprising 100 parts by weight of polyvinyl alcohol resin, 11 to 13 parts by weight of a skin moisturizing improvement functional compound, and 3 to 5 parts by weight of an adhesive aid;
A UV-blocking layer having UV-blocking functionality located on the upper portion of the skin contact layer and comprising 100 parts by weight of polyurethane resin and 15 parts by weight of a UV-blocking component; and
A surface layer located on the upper part of the above ultraviolet ray blocking layer and comprising a polyolefin polymer;
Including,
The adhesive agent comprises a porous PDMS flake having micropores formed on the surface and a mixture of polyvinyl alcohol, hyaluronic acid and vinyl acetate copolymer supported in the micropores.
The surface layer has a tensile strength of 0.5 to 2 N/mm ² ,
A transparent patch for outdoor use with visible light transmission properties. delete delete delete delete delete delete delete delete delete delete