Film for muscle application, and transfer sheet

Abstract

To provide a film for skin application capable of suppressing adverse effects by sebum, and a transfer sheet.SOLUTION: There is provided a film 10 for skin application having a first surface 10F stuck to the skin and a second surface 10R opposite to the first surface 10F. The first surface 10F has incompatibility with sebum. The film 10 for skin application is a laminate comprising a surface layer 12 constituting the first surface 10F and a thin film layer 11 constituting the second surface 10R. The surface layer 12 is formed of a water-soluble material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a film for skin attachment and a transfer sheet for attaching the film for skin attachment to the skin.

Background Art

[0002] An extremely thin film having a thickness of about several nm to several μm has adhesiveness to the surface of a living organ, and thus attempts have been made to attach and use the film to organs, skin, etc. For example, Non-Patent Document 1 reports that the above film can be used as a wound covering material. In addition, it has also been proposed to attach the above film to the skin for skin care and makeup assistance. For example, Patent Document 1 proposes a beauty method in which a cosmetic is applied from above the film after the film is attached to the skin.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, sebum secreted from sebaceous glands is present in a non-negligible amount on the surface of the skin. While sebum has beneficial effects such as protecting, moisturizing, and antibacterial properties of the skin, it may also cause adverse effects such as odor and makeup smudging.

[0006] An object of the present invention is to provide a film for skin attachment and a transfer sheet that can suppress the adverse effects of sebum.

Means for Solving the Problems

[0007] The film for skin attachment that solves the above problems has an average mass of 0.01 g / m 2 or more and 10 g / m 2 or less, has a first surface that is attached to the skin and a second surface that is on the side opposite to the first surface, and the first surface is incompatible with sebum.

[0008] According to the above configuration, when the film for skin attachment is attached to the skin, sebum infiltration into the film for skin attachment is suppressed. As a result, sebum exudation onto the second surface of the film for skin attachment is suppressed. Thereby, adverse effects caused by the presence of sebum on the outermost surface of the living body, such as makeup collapse, are suppressed.

[0009] In the above configuration, the film for skin attachment may be a laminate including a surface layer that constitutes the first surface and a thin film layer that constitutes the second surface. According to the above configuration, a film for skin attachment having a first surface that is incompatible with sebum can be formed by laminating thin films. Therefore, for example, compared with the case where the first surface is formed by surface modification of the thin film, the production of the film for skin attachment is easy.

[0010] In the above configuration, the surface layer may be composed of a water-soluble material. According to the above configuration, a first surface that is incompatible with sebum is preferably realized.

[0011] In the above configuration, when the first surface of the film for skin attachment is brought into contact with filter paper impregnated with artificial sebum and allowed to elapse for 4 hours, the ratio of the area occupied by the portion where artificial sebum has exuded on the second surface to the second surface may be 30% or less. According to the above configuration, even when the film for skin attachment is attached to a site with a large amount of sebum such as the forehead, sebum exudation onto the second surface of the film for skin attachment is preferably suppressed.

[0012] The transfer sheet for solving the above problems includes the film for skin attachment, a protective layer covering the first surface of the film for skin attachment, and a support layer supporting the second surface of the film for skin attachment. According to the above configuration, when the transfer sheet is stored or moved, the first surface of the film for skin attachment is protected, so that the incompatibility with sebum on the first surface is preferably maintained. Further, since the film for skin attachment is supported by the support layer, deformation of the film for skin attachment is suppressed and the film for skin attachment becomes easy to handle.

Effect of the Invention

[0013] According to the present invention, adverse effects caused by sebum can be suppressed.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0015] With reference to the drawings, an embodiment of the film for skin attachment and the transfer sheet will be described. [Configuration of Film for Skin Attachment] As shown in FIG. 1, the film 10 for skin attachment has a first surface 10F and a second surface 10R which is the surface opposite to the first surface 10F. The first surface 10F is the surface to be attached to the skin. The second surface 10R is the surface exposed to the outside air when the film 10 for skin attachment is attached to the skin.

[0016] The film 10 for skin attachment includes a thin film layer 11 and a surface layer 12. The surface layer 12 is laminated on one of the two surfaces of the thin film layer 11. The first surface 10F is the surface of the surface layer 12, and the second surface 10R is the surface of the thin film layer 11. That is, when the film 10 for skin attachment is attached to the skin, the surface layer 12 contacts the skin.

[0017] The thin film layer 11 has a thickness that can exhibit adhesiveness to the skin. For example, the thickness of the thin film layer 11 is 10 nm or more and 5000 nm or less. If the thickness of the thin film layer 11 is within the above range, the thin film layer 11 itself can adhere to the surface of the living body without using an adhesive layer. From the perspective of enhancing the adhesion to the skin, the thickness of the thin film layer 11 is preferably 2000 nm or less. Furthermore, since the adhesion to the skin and the followability to the surface shape of the skin can be enhanced, and the discomfort caused to the living body when the thin film layer 11 is attached can be reduced, the thickness of the thin film layer 11 is preferably 100 nm or more and 750 nm or less. The thin film layer 11 may be a layer composed of a single thin film or a layer composed of a plurality of thin films.

[0018] When expressing the property of having a thickness that can exhibit adhesiveness to the skin in terms of the mass of the thin film layer 11 instead of the thickness, for example, when the density of the thin film layer 11 is 1 g / cm 3 or more and 3 g / cm 3 or less, the average mass per unit area of the thin film layer 11 is 0.01 g / m 2 or more and 10 g / m 2 or less. If the average mass of the thin film layer 11 is within the above range, the thin film layer 11 itself can adhere to the surface of the living body without using an adhesive layer.

[0019] The material constituting the thin film layer 11 is not particularly limited as long as it can form a thin film layer with the above thickness or mass. The material of the thin film layer 11 is, for example, one or more materials selected from the group consisting of polymer materials such as polylactic acid, hyaluronic acid, polyglycolic acid, fibroin, polycaprolactone, chitosan, copolymers of these polymer materials, and acrylic urethane copolymers. There is no particular limitation on the molecular weight of the material of the thin film layer 11. The thin film layer 11 may be composed of one type of material having a predetermined average molecular weight, or may be composed of a plurality of types of materials having different average molecular weights.

[0020] The thin film layer 11 may contain a functional substance which is a substance that exhibits a predetermined function on the skin. Examples of the functional substance include cosmetics or cosmetic ingredients used for skin care such as moisturizing creams and beauty essences, pigments, drugs, proteins, and enzymes. The thin film layer 11 may contain only one type of functional substance, or may contain two or more types.

[0021] The surface layer 12 is composed of a material that is incompatible with sebum. For example, the surface layer 12 is composed of a water-soluble material. Examples of the water-soluble material include water-soluble resins such as polyvinyl alcohol and polyvinyl pyrrolidone, cellulose derivatives such as carboxymethyl cellulose and methyl cellulose, and natural polysaccharides such as sodium alginate. In this embodiment, the water-soluble material refers to a material that dissolves 0.1 g or more in 100 g of water at 20°C. Alternatively, the surface layer 12 may be a layer formed by spraying a fluorine oil or the like on the surface of the thin film layer 11 and having a surface with oil repellency as the first surface 10F.

[0022] The thicker the surface layer 12, the lower the sebum permeability of the skin-attaching film 10, and the thinner the surface layer 12, the higher the adhesion of the skin-attaching film 10 to the skin. From this perspective, the thickness of the surface layer 12 is preferably 1 nm or more and 2000 nm or less.

[0023] In addition, in order to obtain good adhesiveness of the skin-attaching film 10 to the skin, the thickness of the surface layer 12 is preferably smaller than the thickness of the thin film layer 11, and the total thickness of the skin-attaching film 10 combining the thin film layer 11 and the surface layer 12 is preferably 11 nm or more and 5001 nm or less. In addition, in order to obtain good adhesiveness of the skin-attaching film 10 to the skin, when the density of the skin-attaching film 10 combining the thin film layer 11 and the surface layer 12 is 1 g / cm 3 or more and 3 g / cm 3 or less, the average mass per unit area of the skin-attaching film 10 is preferably 0.01 g / m 2 or more and 10 g / m 2 or less.

[0024] Note that the thicknesses of the above-described skin-attaching film and its constituent layers are average thicknesses and are average values of film thicknesses measured at a plurality of measurement points. In addition, the average mass of the above-described skin-attaching film and its constituent layers is the mass converted per portion having an area of 1 m 2 in a plan view, and is obtained by cutting out each of any three locations in the object into a film piece having a square shape with a side of 100 mm in a plan view and multiplying the average value of the masses measured with a precision balance of the three film pieces by 100.

[0025] In the present embodiment, since the surface layer 12 is provided, the skin-attaching film 10 has a first surface 10F that is incompatible with sebum. The fact that the first surface 10F is incompatible with sebum means that when artificial sebum is brought into contact with the first surface 10F and after 1 hour, the artificial sebum is tissue-off, that is, when it is removed by gently pressing with a tissue, no oil stain or distortion is visually recognized on the first surface 10F. As the artificial sebum, artificial sebum having a composition used in the calculation of the sebum penetration area ratio described later is used.

[0026] Since the skin-attaching film 10 has the first surface 10F that is incompatible with sebum, the penetration of sebum in the skin-attaching film 10 is suppressed. The inventor of the present application has found that the suppressibility of the penetration of sebum in the skin-attaching film 10 can be accurately evaluated by using the sebum penetration area ratio.

[0027] The sebum penetration area ratio is the ratio of the area of the portion where sebum has exuded on the second surface 10R to the second surface 10R when the first surface 10F of the skin attachment film 10 is brought into contact with filter paper impregnated with artificial sebum and allowed to stand for 4 hours. Specifically, the sebum penetration area ratio is calculated by the following procedure.

[0028] 1) Apply artificial sebum to the surface of the polypropylene film so that the application amount per 1 cm 2 is 6 g. As the polypropylene film, for example, a 50-μm-thick film manufactured by Futamura Chemical Co., Ltd. is used. The composition of the artificial sebum is 31.4% by weight of oleic acid, 14.2% by weight of squalene, 23.1% by weight of octyldodecyl myristate, and 31.3% by weight of triolein.

[0029] 2) Place a Kiriyama filter paper (manufactured by Kiriyama Seisakusho: No. 5A, diameter 40 mm) on the surface of the artificial sebum on the polypropylene film. When the amount of sebum exuded onto the filter paper was measured with a sebum meter manufactured by Delfin Technologies, it was about 30 μg / cm 2 . The generally known sebum amount on the male forehead is 30 μg / cm 2 to 40 μg / cm 2 . It was confirmed that the amount of sebum on the filter paper is approximately close to the sebum amount on a general male forehead.

[0030] 3) Produce a paper frame having a square outer shape with a side length of 70 mm and a frame width of 5 mm, and fix the skin attachment film 10 to the frame so that the end of the skin attachment film 10 is supported by the frame. Thereby, a skin attachment film 10 having a square shape with a side length of 60 mm is disposed in the region surrounded by the frame. This skin attachment film 10 is laminated on the filter paper on the artificial sebum produced in the above 2) so that the surface layer and the filter paper are in contact with each other, and lightly pressure-bonded to form a sample.

[0031] 4) After leaving the sample formed in 3) above in an environment of 25°C for 4 hours, place an oil-absorbing paper (manufactured by Kose Cosmetics Co., Ltd.) formed into a circular shape with a diameter of 40 mm on the skin-attaching film 10 in the sample and lightly press-bond them. As a result, the sebum exuded onto the second surface 10R of the skin-attaching film 10 is transferred to the oil-absorbing paper.

[0032] 5) Calculate the area of the sebum portion transferred to the oil-absorbing paper in 4) above, that is, the area of the portion discolored due to sebum adsorption on the oil-absorbing paper, by image processing, and obtain the ratio of the area of the sebum portion to the total area of the oil-absorbing paper. The area ratio of the sebum portion is the sebum penetration area ratio. For image processing, for example, ImageJ, which is open-source image processing software, is used. In image processing, for example, binarization processing is performed on the image of the oil-absorbing paper taken using a threshold value determined by a discrimination analysis method such as Otsu's discrimination analysis method to obtain a binarized image. By performing particle analysis on this binarized image, the sebum penetration area ratio can be obtained.

[0033] In order to preferably suppress the adverse effects caused by sebum exudation, it is preferable that the sebum penetration area ratio in the skin-attaching film 10 is 30% or less. When the sebum penetration area ratio is 30% or less, even when the skin-attaching film 10 is attached to a part such as the forehead with a large amount of sebum, the exudation of sebum in the skin-attaching film 10 is suppressed to such an extent that no adhesion of sebum to the finger touching the second surface 10R is observed. Therefore, for example, when applying a cosmetic such as foundation on the skin-attaching film 10, makeup collapse can be suppressed.

[0034] [Configuration of Transfer Sheet] As shown in FIG. 2, the transfer sheet 20 includes a skin-attaching film 10, a support layer 21, and a protective layer 22.

[0035] The support layer 21 is in contact with the second surface 10R of the skin-adhering film 10 and supports the skin-adhering film 10. The support layer 21 has a function of suppressing deformation of the skin-adhering film 10 when storing the skin-adhering film 10 or moving the skin-adhering film 10 to the target site for pasting the skin-adhering film 10 during use of the skin-adhering film 10. By being supported by the support layer 21, the skin-adhering film 10 becomes easier to handle.

[0036] The support layer 21 is preferably a porous substrate. The porous substrate is a substrate having a large number of minute gaps inside and can allow liquid to penetrate or permeate. Examples of the porous substrate that can be used as the support layer 21 include sheets made of fiber materials such as non-woven fabrics, paper, knitted fabrics, woven fabrics, and resin sheets having a structure including gaps like a mesh shape. Among these substrates, non-woven fabrics are preferably used because they can quickly absorb and diffuse moisture. The fibers constituting the non-woven fabric are, for example, natural fibers such as cotton, hemp, wool, pulp, semi-synthetic fibers such as rayon, and synthetic fibers such as polyvinyl alcohol and polyacrylic acid. Among the above fibers, natural fibers, particularly pulp, are preferably used. The non-woven fabric may be composed of one type of fiber or two or more types of fibers.

[0037] The manufacturing method of the non-woven fabric used as the support layer 21 is not particularly limited, and examples of the manufacturing method include the spunlace method, the spunbond method, the needle punch method, the meltblown method, the airlaid method, the flash spinning method, and the resin bonding method. The basis weight of the non-woven fabric used as the support layer 21 is preferably 10 g / m 2 or more and 150 g / m 2 or less, and more preferably 20 g / m 2 or more and 50 g / m 2 or less because it has an excellent feel in use such as touch. The basis weight of the non-woven fabric is, that is, the mass per unit area of the non-woven fabric. Note that the support layer 21 is not limited to a porous substrate and may be composed of a substrate such as a resin sheet or a metal foil that does not have gaps inside.

[0038] The protective layer 22 covers the first surface 10F of the skin-adhering film 10 and protects the skin-adhering film 10. As the porous base material constituting the support layer 21, any of the above-described materials can be used. The protective layer 22 and the support layer 21 may be composed of the same type of porous base material or may be composed of different types of porous base materials. Note that the protective layer 22 is not limited to a porous base material and may be composed of a base material such as a resin sheet or a metal foil that does not have a gap inside.

[0039] [Method for manufacturing skin-adhering film and transfer sheet] An example of a method for manufacturing the skin-adhering film 10 and the transfer sheet 20 will be described. Note that as long as the manufacturing of the above-described skin-adhering film 10 and transfer sheet 20 is possible, a manufacturing method different from the following may be used.

[0040] First, a thin film layer 11 is formed on the surface of a base material for film formation. As the base material for film formation, a resin sheet composed of a thermoplastic resin, a thermosetting resin, a water-soluble resin, or the like is used. Specifically, a coating solution in which the material of the thin film layer 11 is dissolved is applied to the surface of the base material for film formation, and the coating film is dried, whereby the thin film layer 11 is formed. As the solvent of the coating solution, a protic polar solvent or an aprotic polar solvent is used according to the characteristics of the material of the thin film layer 11. Examples of the protic polar solvent include water, ethanol, isopropanol, and acetic acid. Examples of the aprotic polar solvent include ethyl acetate, butyl acetate, propyl acetate, methyl ethyl ketone, acetone, and dimethyl sulfoxide.

[0041] The coating method of the coating solution is not particularly limited as long as it can form the thin film layer 11 with a desired film thickness. As the coating method, for example, any of a gravure method, a microgravure method, a spin coating method, a spray coating method, and an electrospinning method is preferably used. Also, the drying temperature of the coating film is preferably equal to or higher than the boiling point of the solvent used in the coating solution.

[0042] Subsequently, the support layer 21 is brought into contact with the surface of the thin film layer 11 on the substrate for film formation, and the thin film layer 11 is transferred from the substrate for film formation to the support layer 21. As the transfer method, a known transfer method such as a method using peeling by suction or a method using a sacrificial film may be used.

[0043] Furthermore, a surface layer 12 is formed on the surface of the thin film layer 11 on the support layer 21. For example, a coating liquid in which the material of the surface layer 12 is dissolved is applied to the surface of the thin film layer 11, and the surface layer 12 is formed by drying the coating film. When the surface layer 12 is composed of a water-soluble material, for example, water may be used as the solvent of the coating liquid.

[0044] The method of applying the coating liquid is not particularly limited as long as it can form the surface layer 12 to a desired film thickness. Examples of the coating method include a gravure method, a microgravure method, a spin coating method, a spray coating method, an electrospinning method, and the like.

[0045] After the formation of the surface layer 12, a protective layer 22 is laminated on the surface of the surface layer 12. Thereby, a transfer sheet 20 including the skin-attaching film 10 is formed. Before or after the lamination of the protective layer 22, the outer shapes of the skin-attaching film 10 and the transfer sheet 20 may be adjusted by a method such as die-cutting.

[0046] [Method of attaching the skin-attaching film] A method of attaching the skin-attaching film 10, that is, a method of transferring the skin-attaching film 10 using the transfer sheet 20 will be described. Hereinafter, a method of using a porous substrate as the support layer 21 and wetting the transfer sheet 20 to transfer the skin-attaching film 10 to the skin will be described.

[0047] First, a liquid such as water is supplied to the attachment location of the skin-attaching film 10 on the skin. The supplied liquid, which is the supply liquid, may be any liquid that can wet the transfer sheet 20. Specifically, it may be a liquid containing water or oils such as massage oil. For example, water or cosmetics such as lotion can be used as the supply liquid.

[0048] Subsequently, the protective layer 22 is peeled off from the transfer sheet 20, and the laminate of the skin-adhesive film 10 and the support layer 21 is placed on the skin so that the first surface 10F of the skin-adhesive film 10 contacts the application site. By pressing the laminate from above the support layer 21 with a finger or the like, the supply liquid is allowed to penetrate to the support layer 21. The load applied to the skin-adhesive film 10 during this pressing is 10 g / cm 2 to 900 g / cm 2 or less. Further, in order to reduce the damage to the skin, the load is preferably 10 g / cm 2 or more and 20 g / cm 2 or less. Even with a load of this magnitude, the skin-adhesive film 10 adheres sufficiently to the skin.

[0049] Subsequently, the support layer 21 is peeled off from the skin-adhesive film 10. Thereby, the skin-adhesive film 10 is attached to the skin. Due to swelling of the support layer 21, which is a porous substrate, due to wetting, or the supply liquid entering between the support layer 21 and the skin-adhesive film 10, the support layer 21 is likely to be peeled off from the skin-adhesive film 10.

[0050] In the above transfer method, although a method of supplying the supply liquid to the skin before arranging the transfer sheet 20 on the skin has been exemplified, the supply liquid may be supplied to the transfer sheet 20 after arranging the transfer sheet 20 on the skin. Further, the support layer 21 may be peeled off from the skin-adhesive film 10 without wetting the transfer sheet 20. In this case, the support layer 21 does not have to be a porous substrate.

[0051] After the skin-adhesive film 10 is attached to the skin, cosmetics may be applied from above the skin-adhesive film 10. In this case, the cosmetics are applied to the second surface 10R of the skin-adhesive film 10. The type of the cosmetics to be applied is not particularly limited, and for example, cosmetics for makeup such as foundation or cosmetics for sun care such as sunscreen can be used. By using the skin-adhesive film 10 of the present embodiment, sebum exudation can be suppressed, and thus makeup smudging can be suppressed.

[0052] [Example] The above-described film for skin attachment will be described using specific examples and comparative examples. (Example 1) DL-polylactic acid (manufactured by Musashino Chemical Laboratory) was dissolved in ethyl acetate so that the solid content was 6% to produce a coating solution for forming a thin film layer. The average molecular weight of the polylactic acid used was 110,000. The above coating solution was applied to a polyethylene terephthalate sheet (manufactured by Toray Industries, Inc.: Lumirror S10) as a base material for film formation using a wire bar (#4), and a coating film was formed. The coating film was heated at 70 degrees for 60 seconds using an oven to dry and solidify, thereby forming a thin film layer. The thickness of the thin film layer after drying was about 300 nm.

[0053] Subsequently, a non-woven fabric (manufactured by Futamura Chemical Co., Ltd.) was laminated on the thin film layer as a support layer, the base material for film formation was peeled off, and the nano-thin film was transferred from the base material for film formation to the support layer. The main component of the non-woven fabric is cellulose, and the basis weight is 20 g / m 2 is.

[0054] Polyvinyl alcohol (manufactured by Denka Co., Ltd.: degree of polymerization 2400, partially saponified type) was dissolved in a mixed solvent of water and isopropanol so that the solid content was 1% to produce a coating solution for forming a surface layer. The composition of the above mixed solvent is 80% water and 20% isopropanol. The above coating solution was applied to the thin film layer laminated on the support layer using a wire bar (#4), and a coating film was formed. The coating film was heated at 70 degrees for 60 seconds using an oven to dry and solidify, thereby forming a surface layer. The thickness of the surface layer after drying was about 50 nm. Thereby, the film for skin attachment of Example 1 including a thin film layer and a surface layer was obtained. The total thickness of the film for skin attachment of Example 1 was about 350 nm.

[0055] (Example 2) The proportion of polyvinyl alcohol in the coating solution for forming the surface layer was changed so that the solid content became 5%, and the surface layer was formed so that the thickness after drying became about 250 nm. Except for this, the skin-adhesive film of Example 2 was obtained by the same steps as in Example 1. The total thickness of the skin-adhesive film of Example 1 is about 550 nm.

[0056] (Example 3) By the same steps as in Example 1, a laminate of a support layer and a thin film layer was obtained. Instead of polyvinyl alcohol, carboxymethyl cellulose (manufactured by Tokyo Chemical Industry Co., Ltd.: degree of polymerization about 1050) was used. Carboxymethyl cellulose was dissolved in water so that the solid content became 5% to produce a coating solution for forming the surface layer. The above coating solution was applied onto the thin film layer laminated on the support layer using a wire bar to form a coating film. The coating film was heated at 70 degrees for 60 seconds using an oven to dry and solidify, thereby forming the surface layer. The thickness of the surface layer after drying is about 250 nm. Thereby, the skin-adhesive film of Example 3 was obtained. The total thickness of the skin-adhesive film of Example 3 is about 550 nm.

[0057] (Example 4) The proportion of carboxymethyl cellulose in the coating solution for forming the surface layer was changed so that the solid content became 2.5%, and the surface layer was formed so that the thickness after drying became about 120 nm. Except for this, the skin-adhesive film of Example 4 was obtained by the same steps as in Example 3. The total thickness of the skin-adhesive film of Example 4 is about 420 nm.

[0058] (Comparative Example 1) The skin-adhesive film of Comparative Example 1 was obtained by the same steps as in Example 1 except that the surface layer was not formed. The skin-adhesive film of Comparative Example 1 is composed only of the thin film layer, and its total thickness is about 300 nm.

[0059] (Comparative Example 2) Except for not forming the surface layer and applying the coating liquid for forming the thin film layer using a wire bar of size #8 and forming the thin film layer so that the thickness after drying becomes about 500 nm, the skin-adhesive film of Comparative Example 2 was obtained by the same steps as in Example 1. The skin-adhesive film of Comparative Example 2 is composed of only the thin film layer, and its total thickness is about 500 nm.

[0060] <Evaluation method> (Sebum penetration area ratio) For the skin-adhesive films of each Example and Comparative Example, the sebum penetration area ratio was calculated by the method described in the above embodiment. ImageJ was used for image processing, and the sebum penetration area ratio was calculated based on the binarized image obtained by performing binarization processing using Otsu's discriminant analysis method.

[0061] (Evaluation of sebum penetration state of the skin-adhesive film alone) Samples were prepared by cutting the laminate of the skin-adhesive film and the support layer of each Example and Comparative Example into a square shape with a side length of 30 mm. The washed forehead was gently wiped with a cotton puff moistened with water, and the first surface of the skin-adhesive film in the sample was brought into contact. Then, after gently pressing the sample with a cotton puff moistened with water from above the support layer, the support layer was peeled off, and the skin-adhesive film was transferred to the forehead. After 4 hours, a finger was pressed against the second surface of the skin-adhesive film, and the adhesion of sebum to the finger was visually judged from the degree of greasiness.

[0062] (Evaluation of sebum penetration state during foundation application) Samples were prepared by cutting the laminate of the skin-adhesive film and the support layer for each example and comparative example into a square shape with a side length of 30 mm. The washed forehead was gently wiped with a cotton puff moistened with water, and the first surface of the skin-adhesive film in the sample was brought into contact. Then, from above the support layer, after gently pressing the sample with a cotton puff moistened with water, the support layer was peeled off, and the skin-adhesive film was transferred to the forehead. Subsequently, powder foundation was applied to the second surface of the skin-adhesive film with a sponge. The powder foundation was applied to the entire second surface by repeating the operation of applying it in one direction from the upper left end to the right end of the second surface 4 times while shifting the application area downward. After 4 hours had passed, a finger was pressed against the second surface of the skin-adhesive film from above the powder foundation, and the adhesion of sebum to the finger was visually judged from the degree of greasiness.

[0063] <Evaluation Results> Table 1 shows the sebum penetration area ratio for each example and comparative example and the observation results of the degree of sebum adhesion to the finger in the evaluation of the sebum penetration state.

[0064]

Table 1

[0065] As shown in Table 1, in Examples 1 to 4 having a surface layer, in the evaluation of the sebum penetration state, no adhesion of sebum to the finger was confirmed in either the case of the skin-adhesive film alone or when applying the foundation. Therefore, it was confirmed that in Examples 1 to 4, the penetration of sebum in the skin-adhesive film was suitably suppressed.

[0066] In contrast, in Comparative Examples 1 and 2 having no surface layer, adhesion of sebum to the finger was confirmed in the case of the skin-adhesive film alone. Also, regarding when applying the foundation, in Comparative Example 1 with a small film thickness, adhesion of sebum to the finger was confirmed, and in Comparative Example 2 with a large film thickness, although it was a smaller amount than in Comparative Example 1, adhesion of sebum to the finger was confirmed. Therefore, it was confirmed that in Examples 1 to 4, the penetration of sebum was suppressed by the presence of a surface layer that is incompatible with sebum.

[0067] Focusing on the sebum penetration area ratio of each example and comparative example, in Comparative Example 1 where the adhesion of sebum to the finger was most prominent in the evaluation of the sebum penetration state, the sebum penetration area ratio was particularly high. As the sebum penetration area ratio decreases, the penetration of sebum in the skin-attaching film is suppressed. In Examples 1 to 4 where the sebum penetration area ratio is 30% or less, it was shown that the penetration of sebum is suppressed to such an extent that the adhesion of sebum to the finger is not confirmed.

[0068] As described above in the embodiments and examples, according to the skin-attaching film and the transfer sheet, the following effects can be obtained. (1) The skin-attaching film 10 has a surface that is incompatible with sebum as the first surface 10F to be attached to the skin. Therefore, when the skin-attaching film 10 is attached to the skin, the penetration of sebum into the skin-attaching film 10 is suppressed. As a result, the exudation of sebum to the second surface 10R of the skin-attaching film 10 is suppressed. Thereby, adverse effects caused by the presence of sebum on the outermost surface of the living body, such as makeup smudging, are suppressed.

[0069] (2) The skin-attaching film 10 is a laminate including a surface layer 12 constituting the first surface 10F and a thin film layer 11 constituting the second surface 10R. Therefore, the skin-attaching film 10 having the first surface 10F that is incompatible with sebum can be formed by laminating the thin films. Thus, the production of the skin-attaching film 10 is easier compared to the case of forming the first surface 10F by surface modification of the thin film, for example.

[0070] (3) If the surface layer 12 is formed of a water-soluble material, the first surface 10F that is incompatible with sebum is preferably realized. (4) Since the sebum penetration area ratio in the skin-attaching film 10 is 30% or less, even when the skin-attaching film 10 is attached to a site with a large amount of sebum such as the forehead, the exudation of sebum to the second surface 10R of the skin-attaching film 10 is preferably suppressed.

[0071] (5) Since the transfer sheet 20 includes the protective layer 22 that covers the first surface 10F of the skin-adhesive film 10, the first surface 10F is protected during storage and movement of the transfer sheet 20, and the non-compatibility with sebum is preferably maintained. Further, since the skin-adhesive film 10 is supported by the support layer 21, deformation of the skin-adhesive film 10 is suppressed and the skin-adhesive film 10 is easier to handle.

[0072] [Modification Example] The above embodiment can also be implemented with the following modifications. (5) If it has the first surface 10F that is incompatible with sebum, the skin-adhesive film 10 does not have to be a laminate of the thin film layer 11 and the surface layer 12. For example, by modifying the surface of the thin film layer 11 to be hydrophilic and incompatible with sebum, the first surface 10F that is incompatible with sebum may be formed. Further, the surface layer 12 does not have to be a layer formed by coating a coating liquid. For example, the surface layer 12 may be a layer formed by vapor deposition. Further, the surface layer 12 may be a hydrophilic monomolecular layer that is incompatible with sebum.

Explanation of Reference Numerals

[0073] 10…Skin-adhesive film, 10F…First surface, 10R…Second surface, 11…Thin film layer, 12…Surface layer, 20…Transfer sheet, 21…Support layer, 22…Protective layer.

Claims

1. 0.01 g / m ２ 10 g / m or more ２ A film for skin attachment having an average mass of less than or equal to... A first surface that is in contact with the skin and is incompatible with sebum, and a second surface on the side opposite to the first surface, which is located outermost of the skin-attaching film when the first surface is attached to the skin. It includes a surface layer constituting the first surface and a thin film layer constituting the second surface. The surface layer consists of only one of polyvinyl alcohol and carboxymethyl cellulose. The thin film layer has a composition different from that of the surface layer. A skin-attaching film.

2. The material of the thin film layer includes one or more selected from the group consisting of polylactic acid, hyaluronic acid, polyglycolic acid, fibroin, polycaprolactone, chitosan, copolymers thereof, and acrylic urethane copolymers. The skin-attaching film according to Claim 1.

3. The thickness of the surface layer is smaller than the thickness of the thin film layer. The skin-attaching film according to Claim 1 or 2.

4. When the first surface of the skin-attaching film is brought into contact with filter paper impregnated with artificial sebum and 4 hours have passed, the ratio of the area occupied by the part where artificial sebum has exuded on the second surface to the second surface is 30% or less. The skin-attaching film according to any one of Claims 1 to 3.

5. The skin-attaching film according to any one of Claims 1 to 4, A protective layer that covers the first surface of the skin-attaching film, A support layer that supports the second surface of the skin-attaching film, A transfer sheet comprising the above.

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