Memory film for skin

Abstract

To provide a memory film that has excellent mechanical properties and stretchability, maintains its stretched state when stretched and dried, and contracts the skin with a pre-memorized contractile force when attached to wet skin, the memory film having the effect of improving skin elasticity, improving skin wrinkles, and increasing skin density, as well as reducing pore depth, pore area, pore count, and pore volume.SOLUTION: In one aspect of the present invention, a memory film is provided that includes a first layer containing acrylic acid and polyurethane and that is attached to the skin and contracts at a memorized rate after a period of time. In another aspect of the present invention, a method for producing the memory film described above is provided, the method comprising the steps of: applying and drying a solution containing acrylic acid and polyurethane; and stretching the applied and dried material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Disclosed herein is a film that has excellent mechanical properties and stretchability, maintains its stretched state when stretched and dried, and contracts the skin with a pre-stored contraction force when attached to wet skin.

Background Art

[0002] In order to transmit a contraction force to the skin, it is inconvenient to have to pull the skin with an applicator or oneself when attaching the film, and it is difficult to use the same force each time. Also, conventional films attached to the skin have the drawback of losing adhesion in a wet environment.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In one aspect of the present disclosure, an object is to provide a memory film that has excellent mechanical properties and stretchability, maintains its stretched state when stretched and dried, and contracts the skin with a pre-stored contraction force when attached to wet skin.

Means for Solving the Problems

[0005] In one aspect of the present disclosure, provided is a memory film including a first layer containing acrylic acid and polyurethane, which is attached to the skin and contracts at a stored rate over time.

[0006] In another aspect of the present disclosure, there is provided a method for manufacturing the aforementioned memory film, the method comprising the steps of applying and drying a solution containing acrylic acid and polyurethane, and stretching the applied and dried material.

Advantages of the Invention

[0007] In one aspect, the memory film according to the present disclosure has excellent mechanical properties and stretchability, maintains the stretched state when stretched and dried, and can contract the skin with a pre-stored contraction force when attached to wet skin.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0009] Hereinafter, the present disclosure will be described more specifically by the following examples. However, the following examples are merely illustrative for helping the understanding of the present disclosure, and the scope and range of the present disclosure are not limited thereto.

[0010] In an exemplary implementation of the present disclosure, there is provided a memory film comprising a first layer containing acrylic acid and polyurethane, which is attached to the skin and contracts at a stored rate over time.

[0011] In an exemplary implementation of the present disclosure, there is provided a method of attaching a memory film comprising a first layer containing acrylic acid and polyurethane to the skin and causing it to contract at a stored rate over time.

[0012] In an exemplary implementation of the present disclosure, there is provided the use of a first layer containing acrylic acid and polyurethane for manufacturing a memory film that adheres to the skin and shrinks at a rate memorized after a period of time.

[0013] In one implementation, the memory film may be for improving the elasticity of the skin.

[0014] In one embodiment, the memory film may be for improving skin wrinkles.

[0015] In one implementation, the memory film may be for increasing the smoothness of the skin.

[0016] In one implementation, the memory film may be for reducing at least one of the depth, area, number, and volume of pores.

[0017] In one implementation, the time may be 1 to 24 hours.

[0018] For example, the time may be 1 hour or more, 5 hours or more, 10 hours or more, 15 hours or more, or 20 hours or more, and may also be 24 hours or less, 20 hours or less, 15 hours or less, 10 hours or less, or 5 hours or less.

[0019] In one implementation, the memorized rate may be such that the surface area after the passage of time is 100% with respect to 150 - 200% of the surface area at the time of skin attachment.

[0020] For example, with respect to 150% or more, 170% or more, or 190% or more of the surface area at the time of skin attachment, and 200% or less, 180% or less, or 160% or less, the surface area after the passage of time may be 100%.

[0021] In one implementation, the acrylic acid may be polyacrylic acid.

[0022] In one implementation example, the content of the polyurethane may be less than 50% by weight based on the total weight of the first layer. When the polyurethane content is 50% by weight or more, although the strength of the physical properties increases, it may return to its original state during stretching and drying, and it may be difficult to use as a memory film.

[0023] For example, based on the total weight of the first layer, the content of the polyurethane may be less than 50% by weight, less than 30% by weight, less than 20% by weight, less than 10% by weight, less than 5% by weight, or less than 1% by weight, and may be, for example, 1% by weight or more, 5% by weight or more, 10% by weight or more, 20% by weight or more, 30% by weight or more, or 40% by weight or more.

[0024] In one implementation example, the weight ratio of the acrylic acid to the polyurethane may be 1 to 3:1.

[0025] For example, the weight ratio of the acrylic acid to the polyurethane may be 1:1 or more, 1.5:1 or more, 2:1 or more, or 2.5:1 or more, and may be 3:1 or less, 2.5:1 or less, 2:1 or less, or 1.5:1 or less.

[0026] In one implementation example, the first layer may further contain Laponite. By containing Laponite, the strength of the memory film can be further improved.

[0027] The total molecular weight of the acrylic acid and the polyurethane may be 100,000 to 1,000,000.

[0028] In this specification, the molecular weight is defined as the weight average molecular weight (Mw).

[0029] For example, the total molecular weight of acrylic acid and polyurethane may be 100,000 or more, 200,000 or more, 300,000 or more, 400,000 or more, 500,000 or more, 600,000 or more, 700,000 or more, 800,000 or more, or 1,000,000 or less, 900,000 or less, 800,000 or less, 700,000 or less, 600,000 or less, 500,000 or less, 400,000 or less, 300,000 or less, or 200,000 or less.

[0030] In one implementation example, the thickness of the first layer may be 100 to 3000 μm.

[0031] For example, the thickness of the first layer may be 100 μm or more, 300 μm or more, 500 μm or more, 700 μm or more, 900 μm or more, 1100 μm or more, 1300 μm or more, 1500 or more, 1700 μm or more, 2000 μm or more, and may also be 3000 μm or less, 2500 μm or less, 2000 μm or less, 1700 μm or less, 1500 μm or less, 1300 μm or less, 1100 μm or less, 900 μm or less, 700 μm or less, 500 μm or less, or 300 μm or less.

[0032] In one implementation example, the memory film may further include a second layer including at least one selected from the group consisting of polyurethane, spandex, PVC, and nylon. By further providing the second layer which is a stretchable mesh or film such as polyurethane, spandex, PVC, or nylon, the physical properties and shrinkage strength of the memory film can be improved.

[0033] In one implementation example, the second layer may include polyurethane.

[0034] For example, the second layer may be manufactured by applying a solution containing polyurethane. With respect to the total weight of the solution, the content of polyurethane in the solution may be less than 50% by weight, less than 30% by weight, less than 20% by weight, less than 10% by weight, less than 5% by weight, or less than 1% by weight. For example, it may also be 1% by weight or more, 5% by weight or more, 10% by weight or more, 20% by weight or more, 30% by weight or more, or 40% by weight or more.

[0035] For example, in the case of the finally manufactured second layer, all the solvent in the solution may volatilize and it may consist of polyurethane.

[0036] In one implementation example, the thickness of the second layer may be 1 to 200 μm.

[0037] For example, the thickness of the second layer may be 1 μm or more, 30 μm or more, 50 μm or more, 70 μm or more, 90 μm or more, 100 μm or more, 130 μm or more, 150 μm or more, or 170 μm or more. It may also be 200 μm or less, 170 μm or less, 150 μm or less, 130 μm or less, 100 μm or less, 90 μm or less, 70 μm or less, 50 μm or less, 30 μm or less, 10 μm or less, or 5 μm or less.

[0038] In another exemplary implementation example of the present disclosure, there is provided a manufacturing method of the aforementioned memory film, which includes a step of applying and drying a solution containing acrylic acid and polyurethane, and a step of stretching the applied and dried material.

[0039] In one implementation example, the solution containing acrylic acid and polyurethane may further contain laponite.

[0040] In one implementation example, the solution containing acrylic acid and polyurethane may further contain water and ethanol.

[0041] In one implementation example, before the step of applying and drying the solution containing acrylic acid and polyurethane, a step of applying and drying a solution containing at least one selected from the group consisting of polyurethane, spandex, PVC, and nylon may be further provided to produce a memory film further including a second layer.

[0042] In one implementation example, before the step of applying and drying the solution containing acrylic acid and polyurethane, a step of applying and drying a solution containing polyurethane may be further provided to produce a memory film further including a second layer.

[0043] For example, with respect to the total weight of the solution containing polyurethane, the content of the polyurethane may be less than 50% by weight, less than 30% by weight, less than 20% by weight, less than 10% by weight, less than 5% by weight, or less than 1% by weight, and may also be 1% by weight or more, 5% by weight or more, 10% by weight or more, 20% by weight or more, 30% by weight or more, or 40% by weight or more.

[0044] In one implementation example, after the stretching step, a drying step may be further provided.

[0045] Hereinafter, the present invention will be described in more detail with reference to examples. It is self-evident to those having ordinary knowledge in the art that these examples are merely for illustrating the present invention, and the scope of the present invention is not limited by these examples in any way.

[0046] [Examples] Production Example 1. Production of a 1-layer memory film 1) Prepare Solution A. Dissolve 10 - 15% by weight of polyurethane in a 95% ethanol solution.

[0047] 2) Prepare Solution B. Dissolve laponite in a product obtained by dissolving a - 1 to 5 wt% polyacrylic acid solution in water. The total molecular weight of polyacrylic acid and polyurethane is 800,000.

[0048] 3) Mix solution A, solution B, and 70% ethanol with a mixer. That is, produce a PU - PAA - laponite resin.

[0049] 4) Uniformly apply the well - mixed PU - PAA - laponite resin in 3) to a thickness of 500 to 2000 μm and dry it.

[0050] 5) Conduct secondary heating and drying at a temperature of 100 °C or higher to induce a cross - linking reaction by laponite.

[0051] 6) Hydrate the dried film, stretch it by 150 to 200%, and then heat it to completely dry it.

[0052] Production Example 2. Production of a two - layer memory film (double patch; Double patch) 1) Prepare solution (Solution) A. Dissolve - 10 to 15 wt% polyurethane in a 95% ethanol solution.

[0053] 2) Apply solution A to a thickness of 50 to 100 μm and dry it.

[0054] 3) Prepare solution B. Dissolve laponite in a - 1 to 5 wt% polyacrylic acid solution.

[0055] 4) Mix solution A, solution B, and 70% ethanol with a mixer. That is, produce a PU - PAA - laponite resin.

[0056] 5) Uniformly apply the well - mixed PU - PAA - laponite resin in 3) to a thickness of 500 to 2000 μm on the film where solution A has dried, and dry it.

[0057] 6) Induce the cross-linking reaction with laponite by performing secondary heating and drying at a temperature above 100 °C.

[0058] 7) Hydrate the dried film, stretch it by 150 - 200%, and then heat it to completely dry.

[0059] [Test Example] Test Example 1 - Confirmation of shrinkage in a humid environment (strain provided) As shown in Figure 1, when a humid environment (water) was provided to the stretched dried film (5 cm), it was confirmed that the size of the film decreased (3.1 cm).

[0060] Test Example 2 - Shape change of the face when applying to the skin When an appropriate amount of water was applied to the cheek area of the face and then a film with a size of 5 × 3 cm was attached, it was confirmed with VECTRA H2 FACE Sculptor (registered trademark) that the film changed the shape of the face while shrinking 5 minutes after attachment.

[0061] Referring to Figure 2, it can be confirmed that the skin around the attached film shrank on the right face where the film was attached compared to the left face where no film was attached.

[0062] Test Example 3 - Comparison of physical properties based on double film or single film and molecular weight Referring to Figure 3, in the case of a double film (double patch) manufactured with a total molecular weight Mw = 800,000 of polyacrylic acid and polyurethane, the tensile strength was the highest. In the case of a single film (single patch), when the total molecular weight (Mw) of polyacrylic acid and polyurethane was 250,000, it was confirmed that the tensile strength was significantly higher when it was 800,000.

[0063] Test Example 4 - Human body performance evaluation for multiple items including elasticity ● Test product: Using the memory film manufactured in Production Example 1, evaluations were made on elasticity, lift-up, wrinkles, skin fineness, and pores.

[0064] ● Subjects: 25 women who met the selection criteria and did not meet the exclusion criteria [20 completed the final test, 47.200 ± 3.548 years old, 5 dropped out (due to schedule non-compliance)]

[0065] ● Experimental method: The test product was applied on the forehead, between the eyebrows, and above the nasolabial folds of the face before going to bed. After about 8 hours of sleep, it was gently peeled off while washing the face in the morning. After continuous use for 7 days, instrument measurements and questionnaire evaluations were conducted before using the test product, 4 days after use, 7 days after use, and 21 days after interruption. * Use the product once in the screening step before the start of the test to check for abnormal reactions. Conduct this test on those without abnormal reactions.

[0066] ● Evaluation items 1) Instrument evaluation - Elasticity: Cutometer - Lift-up: F-ray - Wrinkles: Primos - Skin fineness: Skin scanner - Pores: Antera

[0067] 2) Subjective questionnaire evaluation based on the feeling of use: Subjective questionnaire evaluation of the subjects

[0068] 3) Safety evaluation: Abnormal reaction evaluation by the subjects

[0069] ● Test results In this test, women aged 40 to 53 with wrinkles and pores (who had not received any treatments in the past three months) were selected as subjects. To measure multiple improvements including elasticity, the test product was used for 7 days, and instrument measurements and subjective questionnaire evaluations based on the feeling of use were conducted. The following results were confirmed.

[0070] 1) Elasticity, R2 1-1) Forehead - As shown in Table 1 below, the measured values of elasticity increased to a significant level (p < 0.05) in all cases, by 10.000% four days after use, 12.857% seven days after use, and 8.750% twenty-one days after interruption, compared to before product use, and it was confirmed that they were improved.

[0071]

Table 1

[0072] 1 - 2) Cheek - As shown in Table 2 below, the measured values of elasticity increased to a significant level (p < 0.05) in all cases, by 7.431% four days after use, 9.370% seven days after use, and 7.916% twenty-one days after interruption, compared to before product use, and it was confirmed that they were improved. - The measured value of elasticity twenty-one days after interruption showed no significant difference from that seven days after use (p > 0.05), and the effect of maintaining elasticity until twenty-one days after use interruption was confirmed.

[0073]

Table 2

[0074] 2) Lift-up, ° - As shown in Table 3 below, the measured values of lift-up increased to a significant level (p < 0.05) in all cases, by 1.508% four days after use, 2.364% seven days after use, and 0.724% twenty-one days after interruption, compared to before product use, and it was confirmed that they were improved.

[0075]

Table 3

[0076] 3) Wrinkles, Ra 3 - 1) Forehead - As shown in Table 4 below, the measured value of wrinkles decreased to a significant level of 7.968% four days after use (p < 0.05) compared to before product use, and it was confirmed that improvement occurred.

[0077]

Table 4

[0078] 3 - 2) Between eyebrows - As shown in Table 5 below, the measured value of wrinkles decreased to a significant level of 5.682% four days after use (p < 0.05) compared to before product use, and it was confirmed that improvement occurred.

[0079]

Table 5

[0080] 3 - 3) Smile lines As shown in Table 6 below, the measured value of wrinkles decreased to a significant level of 2.907% four days after use and 3.160% seven days after use (p < 0.05) compared to before product use, and it was confirmed that improvement occurred.

[0081]

Table 6

[0082] 4) Skin fineness, % 4 - 1) Forehead As shown in Table 7 below, the measured value of skin fineness increased to a significant level of 5.028% four days after use and 4.470% seven days after use (p < 0.05) compared to the skin before product use, and it was confirmed that improvement occurred.

[0083]

Table 7

[0084] 4 - 2) Cheek - As shown in Table 8 below, the measured value of skin fineness increased to a significant level (p < 0.05), by 7.508% after 4 days and 7.606% after 7 days of use, compared with before product use, and it was confirmed that it was improved.

[0085]

Table 8

[0086] 5) Pores 5-1) Depth of pores, mm - As shown in Table 9 below, the measured value of the depth of pores decreased to a significant level (p < 0.05), by 10.000% after 7 days of use, compared with before product use, and it was confirmed that it was improved.

[0087]

Table 9

[0088] 5-2) Area of pores, mm 2 - As shown in Table 10 below, the measured value of the area of pores decreased to a significant level (p < 0.05), by 15.198% after 4 days of use, 20.629% after 7 days of use, and 10.172% after 21 days from interruption, compared with before product use, and it was confirmed that it was improved.

[0089]

Table 10

[0090] 5-3) Number of pores, ea - As shown in Table 11 below, the measured value of the number of pores decreased to a significant level (p < 0.05), by 10.109% after 4 days of use, 14.412% after 7 days of use, and 5.236% after 21 days from interruption, compared with before product use, and it was confirmed that it was improved.

[0091]

Table 11

[0092] 5-4) Pore volume, mm 3 - As shown in Table 12 below, the measured values of pore volume decreased to a significant level (p<0.05) by 16.517% four days after use, 22.823% seven days after use, and 12.012% twenty-one days after interruption, as compared with before product use, and it was confirmed that they were improved.

[0093]

Table 12

[0094] 6) Results of subjective questionnaire evaluation based on usability - The results of subjective questionnaire evaluation based on usability after using the test product are shown in the following table.

[0095]

Table 13

[0096]

Table 14

[0097]

Table 15

[0098] 7) Safety Since there were no reports of any abnormal reactions while the subjects were using the test product, it was judged to be a safe product.

[0099] In conclusion, the patch according to this example is judged to be useful for improving elasticity (forehead, cheeks), lift-up, wrinkles (forehead, between eyebrows, nasolabial folds), skin fineness (forehead, cheeks), and pores (area, number, volume) four days after use, and is judged to be useful for improving elasticity (forehead, cheeks), lift-up, wrinkles (nasolabial folds), fineness (forehead, cheeks), and pores (depth, area, number, volume) seven days after use.

[0100] Also, compared with before use, it is judged to be useful for improving elasticity (forehead, cheeks), lift-up, and pores (area, number, volume) after seven days of use and 21 days after use interruption, and it is judged to be useful for maintaining the improvement of elasticity (cheeks) from seven days of use until 21 days after interruption.

Claims

1. A memory film comprising a first layer containing acrylic acid and polyurethane, which is affixed to the skin and shrinks at a rate memorized over time.

2. The memory film according to Claim 1, wherein the memory film is for improving the elasticity of the skin.

3. The memory film according to Claim 1, wherein the memory film is for improving skin wrinkles.

4. The memory film according to Claim 1, wherein the memory film is for increasing the fineness of the skin.

5. The memory film according to Claim 1, wherein the memory film is for reducing at least one of the depth of pores, the area of pores, the number of pores, and the volume of pores.

6. The memory film according to Claim 1, wherein the time is 1 to 24 hours.

7. The memory film according to Claim 1, wherein the memorized ratio is such that the surface area after the passage of time is 100% with respect to 150 to 200% of the surface area at the time of skin attachment.

8. The memory film according to Claim 1, wherein the acrylic acid is polyacrylic acid.

9. The memory film according to Claim 1, wherein the content of the polyurethane is less than 50% by weight based on the total weight of the first layer.

10. The memory film according to Claim 1, wherein the weight ratio of the acrylic acid to the polyurethane is 1 to 3:

1.

11. The memory film according to Claim 1, wherein the first layer further contains Laponite.

12. The memory film according to Claim 1, wherein the total molecular weight of the acrylic acid and the polyurethane is 100,000 to 1,000,000.

13. The memory film according to Claim 1, wherein the thickness of the first layer is 100 to 3000 μm.

14. The memory film according to Claim 1, further comprising a second layer containing at least one selected from the group consisting of polyurethane, spandex, PVC, and nylon.

15. The memory film according to Claim 14, wherein the second layer contains polyurethane.

16. The memory film according to Claim 14, wherein the thickness of the second layer is 1 to 200 μm.

17. A method for improving the elasticity of the skin, improving skin wrinkles, increasing the fineness of the skin, or reducing at least one of the depth of pores, the area of pores, the number of pores, and the volume of pores, A method comprising the step of applying the memory film according to any one of claims 1 to 16 to the skin for 1 to 24 hours.

18. A method for manufacturing the memory film according to any one of claims 1 to 16, comprising the steps of applying a solution containing acrylic acid and polyurethane and drying it; and stretching the applied and dried material.

19. The manufacturing method according to claim 18, wherein the solution containing acrylic acid and polyurethane further contains laponite.

20. The manufacturing method according to claim 18, wherein the solution containing acrylic acid and polyurethane further contains water and ethanol.

21. The manufacturing method according to claim 18, further comprising a step of drying after the stretching step.

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