Hydrated gel sheet

Abstract

The present invention aims to provide a water-containing gel sheet that minimizes dripping of the water-containing gel component from the sheet and exhibits good adhesion to the skin. [Solution] The water-containing gel sheet of the present invention is characterized by comprising a first water-containing gel, a support placed on the first water-containing gel, and a second water-containing gel placed on the support. In a preferred embodiment of the water-containing gel sheet of the present invention, a first release film is provided beneath the first water-containing gel. In a preferred embodiment of the water-containing gel sheet of the present invention, a second release film is provided on the second water-containing gel.

Description

Technical Field

[0001] The present invention relates to a water-containing gel sheet.

Background Art

[0002] Conventionally, sheet-like water-containing gel agents have been developed in which a water-containing gel layer is formed on a sheet-like base material. For example, there is disclosed a pack cosmetic in which a pack cosmetic containing a cotton sheet base material made of various materials is impregnated with a pack cosmetic (Patent Document 1). This agent uses cotton as a sheet base material, has a moist feeling, and has an excellent sticking feeling such as little stickiness.

[0003] In addition, in order to improve the skin adhesiveness of a pack cosmetic of the type in which a cosmetic is impregnated into a sheet base material, a non-woven fabric made of hydrophilic fibers such as cotton and having a specific basis weight and porosity is used, and as a cosmetic to be impregnated into the non-woven fabric, a liquid oil, a crosslinked organopolysiloxane, xanthan gum, and water are combined and used in a sheet-like cosmetic is disclosed (Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above-mentioned Patent Document 1, there is a problem that saturated lotion drips or adheres to the skin only by surface tension, so there is a difficulty in skin adhesiveness.

[0006] Furthermore, the aforementioned Patent Document 2 did not adequately address the problems of impregnation-type cosmetics, namely dripping from the sheet and improved skin adhesion.

[0007] Therefore, there was a need for the development of a water-containing gel sheet that does not drip and has good adhesion to the skin. However, such a water-containing gel sheet has not existed until now.

[0008] Therefore, in view of the above-mentioned problems, the present invention aims to provide a water-containing gel sheet that minimizes dripping of the water-containing gel component from the sheet and exhibits good adhesion to the skin. [Means for solving the problem]

[0009] In order to solve the above problems, the inventors of this invention conducted thorough research on water-containing gel sheets and, as a result, completed the present invention.

[0010] In other words, the water-containing gel sheet of the present invention is characterized by comprising a first water-containing gel, a support placed on the first water-containing gel, and a second water-containing gel placed on the support.

[0011] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, a first release film is provided beneath the first water-containing gel.

[0012] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, a second release film is provided on the second water-containing gel.

[0013] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the support is characterized in that it is made of a nonwoven fabric containing cotton.

[0014] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the components of the first water-containing gel and / or the second water-containing gel are permeated into the interior of the support.

[0015] Furthermore, in a preferred embodiment of the hydrated gel sheet of the present invention, the components of the first hydrated gel and / or the second hydrated gel are characterized by containing a water-soluble polymer including an acrylic acid polymer, a polyhydric alcohol, a crosslinking agent, and water.

[0016] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the material of the first release film and / or the second release film is characterized by being at least one selected from the group consisting of polyester, polyethylene, nylon, polyvinyl chloride, or polypropylene.

[0017] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the amount of water-soluble polymer containing the acrylic acid polymer is 6 to 25% by mass relative to the total amount of the water-containing gel.

[0018] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the amount of polyhydric alcohol blended is 5 to 40% by mass relative to the total amount of the water-containing gel.

[0019] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the amount of the crosslinking agent is characterized in that it is 0.02 to 4% by mass relative to the total amount of the water-containing gel.

[0020] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the amount of water added is 20 to 85% by mass relative to the total amount of the water-containing gel. [Effects of the Invention]

[0021] The water-containing gel sheet of the present invention has the useful effect of minimizing the problem of dripping. Furthermore, the water-containing gel sheet of the present invention has the useful effect of stably adhering to the skin and having excellent therapeutic effects. Moreover, the water-containing gel sheet of the present invention has the useful effect of having a superior feeling of adhesion. [Brief explanation of the drawing]

[0022] [Figure 1] FIG. 1 is a view showing a cross section of a water-containing gel sheet in one embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The water-containing gel sheet of the present invention is characterized by comprising a first water-containing gel, a support disposed on the first water-containing gel, and a second water-containing gel disposed on the support. In the present invention, the support has a function of holding the water-containing gel. In the present invention, the components of the first water-containing gel and the second water-containing gel may be the same or different.

[0024] In a preferred embodiment of the water-containing gel sheet of the present invention, the components of the first water-containing gel and / or the second water-containing gel are characterized by containing a water-soluble polymer containing an acrylic acid-based polymer, a polyhydric alcohol, a cross-linking agent, and water.

[0025] Examples of the acrylic acid-based polymer used in the present invention include polyacrylic acid, a partially neutralized product of polyacrylic acid, a completely neutralized product of polyacrylic acid, polyacrylic acid starch, etc. From the viewpoints of adhesiveness and shape retention, one or more kinds containing a partially neutralized product of polyacrylic acid are preferable.

[0026] The water-soluble polymer other than the acrylic acid-based polymer is not particularly limited. For example, gelatin, hydrolyzed gelatin, polyvinyl alcohol, polyvinyl pyrrolidone, hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, methylcellulose, sodium carboxymethylcellulose, carboxyvinyl polymer, methoxyethylene maleic anhydride copolymer, N-vinylacetamide copolymer, xanthan gum, gum arabic, etc. can be used alone or in combination of two or more.

[0027] Furthermore, since polyacrylic acid or sodium polyacrylate has adhesive properties, it is considered that polyacrylic acids have the greatest influence on the adhesiveness of the formulation of the present invention. Regarding shape retention, it is thought that not only polyacrylic acids but also other water-soluble polymers such as carboxyvinyl polymer and carboxymethylcellulose sodium have an influence. In the present invention, by adjusting the amount of each component added, such as humectants such as glycerin, water, crosslinking agents, and stabilizers, the crosslinking strength, viscosity, and pH of the formulation can be optimized, and a formulation exhibiting good adhesiveness and shape retention can be obtained.

[0028] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the amount of water-soluble polymer containing the acrylic acid polymer is not particularly limited, but from the viewpoint of balancing adhesiveness and shape retention, it can be 6 to 25% by mass, and more preferably 6 to 20% by mass, relative to the total amount of water-containing gel. If the amount of water-soluble polymer is less than 6% by mass, the viscosity of the ointment will be low and the shape retention of the ointment will not be maintained. If it is added at more than 25% by mass, the viscosity of the ointment will be high, the water-soluble polymer will not dissolve sufficiently and will become non-uniform, making it impossible to maintain a consistent shape retention of the ointment, which is undesirable.

[0029] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the amount of acrylic acid polymer blended is not particularly limited, but from the viewpoint of balancing adhesiveness and shape retention, it can be 4 to 20% by mass, and more preferably 5 to 15% by mass, relative to the total amount of water-containing gel. If the amount of acrylic acid polymer blended is less than 4% by mass, the viscosity of the ointment will be low, and the shape retention and adhesiveness of the ointment will not be maintained. If it is blended in excess of 20% by mass, the viscosity of the ointment will be high, the water-soluble polymer will not be sufficiently dissolved and will become non-uniform, making it impossible to maintain a consistent shape retention of the ointment, which is undesirable.

[0030] In the present invention, polyhydric alcohols are preferably incorporated. Examples of polyhydric alcohols used in the present invention include glycerin, propylene glycol, 1,3-butylene glycol, D-sorbitol, and polyethylene glycol. Considering skin irritation, one or more types including glycerin are preferred. The amount of polyhydric alcohols is 5 to 40% by mass, preferably 10 to 30% by mass, relative to the total amount of water-containing gel. Of this, the amount of glycerin (amount of glycerin relative to the total amount of water-containing gel) is 3 to 30% by mass, preferably 5 to 20% by mass. If the amount of polyhydric alcohols is less than 5% by mass, the shape retention of the ointment will be insufficient, and if it exceeds 40% by mass, other ingredients, especially water, will be insufficient, resulting in insufficient shape retention of the ointment, which is undesirable.

[0031] In the hydrated gel provided by the present invention, the crosslinking agent for crosslinking the acrylic acid polymer is not particularly limited, but examples include aluminum chloride, aluminum sulfate, potassium aluminum sulfate, ammonium aluminum sulfate, aluminum hydroxide gel, synthetic hydrotalcite, magnesium aluminometasilicate, and dihydroxyaluminum aminoacetate. From the viewpoint of crosslinking strength, dihydroxyaluminum aminoacetate and aluminum hydroxide gel are preferred as crosslinking agents. It is preferable to include one or more of these crosslinking agents. In the present invention, the amount of crosslinking agent can be 0.02 to 4% by mass, preferably 0.04 to 0.2% by mass, based on the total amount of the hydrated gel. Thus, since the water-soluble polymer such as the acrylic acid polymer is crosslinked by the crosslinking agent, the hydrated gel has the advantageous effect of not causing further problems of dripping from the hydrated gel. In addition, the present invention has the advantage that the hydrated gel itself has high tackiness and excellent skin adhesion.

[0032] Furthermore, in the present invention, the amount of water added is 20 to 85% by mass, preferably 45 to 75% by mass, relative to the total amount of the water-containing gel. If the amount of water added is less than 20% by mass, the water-soluble polymer will not dissolve sufficiently, resulting in non-uniformity and making it impossible to maintain a consistent shape retention of the ointment. If the amount of water added exceeds 85% by mass, the viscosity of the ointment will be low, and the shape retention of the ointment will not be maintained, which is undesirable.

[0033] Furthermore, the support material that can be used in the sheet-like water-containing gel sheet of the present invention is not particularly limited. In a preferred embodiment of the water-containing gel sheet of the present invention, for example, the support material is characterized by being made of a nonwoven fabric containing cotton or a rayon-blend cotton nonwoven fabric. In the present invention, unlike plastic nonwoven fabrics, when natural cotton fibers are used as the support material, cotton is softer than plastic fibers, resulting in less irritation to the skin and less likely to cause itching at the application site, among other advantages.

[0034] Furthermore, in the present invention, when a cotton nonwoven fabric is used as the support, the support is covered with a water-containing gel, allowing the cotton fibers of the nonwoven fabric to absorb sufficient moisture. This increases the flexibility of the support, resulting in the advantage of excellent skin conformability of the water-containing gel sheet.

[0035] For example, in the present invention, a nonwoven fabric containing 40 to 100% by mass of cotton is preferably used as the support material. Furthermore, basis weight refers to the weight per unit area of ​​the fabric, and the basis weight of the support material is 25 to 100 g / m². 2 The amount is preferably 25-60 g / m². 2 Furthermore, the void ratio of the sheet is 10-35%, preferably 15-30%. The void ratio can be calculated using the following formula (Daikoku Wire Mesh Co., Ltd.).

[0036] Space ratio (%) = (mesh opening (mm)) 2 (Mesh opening (mm) + wire diameter (φ)) 2 ×100

[0037] Mesh opening (mm) = 25.4 / Mesh (number of meshes) - Wire diameter (φ)

[0038] Such nonwoven fabrics can be manufactured, for example, by the spunlace method or the needle punch method, but from the viewpoint of adjusting strength and reducing fuzzing, manufacturing by the spunlace method is preferred.

[0039] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, a second release film is provided on the second water-containing gel, from the viewpoint of handling ease and protection of the water-containing gel.

[0040] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, a first release film is provided beneath the first water-containing gel, from the viewpoint of handling ease and protection of the water-containing gel. In the present invention, when release films are laminated on both sides of the water-containing gel, for example, when the sheet is applied to the skin with one side of the release film peeled off, it can be applied without any water-containing gel remaining on the fingers, and furthermore, by applying pressure from above the other side of the release film, it can be sufficiently adhered to the skin, which is an advantage. In addition, in the present invention, after the remaining release film is removed, the flexibility of the cotton fibers that have absorbed sufficient moisture provides excellent skin conformability, which is an advantage as it reduces discomfort when applied.

[0041] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the components of the first water-containing gel and / or the second water-containing gel are permeated into the interior of the support.

[0042] Furthermore, in a preferred embodiment of the water-containing gel sheet of the present invention, the material of the first release film and / or the second release film is characterized by being at least one selected from the group consisting of polyester, polyethylene, nylon, polyvinyl chloride, or polypropylene, from the viewpoint of operability. The material of the first release film is not particularly limited, but from the viewpoint of easy release, examples include polyethylene, polypropylene, etc. The material of the second release film is not particularly limited, but from the viewpoint of heavy release, examples include polyester, etc.

[0043] The material of the first release film and the material of the second release film may be the same or different, but if a difference in peel strength is to be provided, they may be made of different materials.

[0044] Furthermore, the present invention may also contain active ingredients. Examples of active ingredients include skin conditioning ingredients such as sodium hyaluronate, polyquaternium-51, water-soluble proteoglycan, soy isoflavone, soy isoflavone, Lactobacillus / soy milk ferment filtrate, water-soluble collagen, hydrolyzed collagen, sugars, amino acids, and ceramides; skin conditioning ingredients such as bilberry leaf extract, prune extract, lemongrass leaf / stem extract, Somei Yoshino cherry leaf extract, grape leaf extract, orange fruit extract, hop flower extract, yuzu fruit extract, passion fruit extract, and mandarin orange peel extract; and occlusive agents such as squalane, mineral oil, olive fruit oil, camellia seed oil, macadamia seed oil, avocado oil, and jojoba seed oil.

[0045] In addition, the present invention may incorporate pH adjusters, excipients, stabilizers, preservatives, antioxidants, plasticizers, surfactants, and the like.

[0046] pH adjusters include tartaric acid, lactic acid, and malic acid, and one or more of these can be used in combination. Excipients are not particularly limited, but for example, kaolin, titanium dioxide, anhydrous silicic acid, zinc oxide, bentonite, etc. can be used alone or in combination of two or more. Stabilizers include, for example, edetates, parahydroxybenzoic acid esters, tartaric acid, tocopherol acetate, ascorbic acid, sodium bisulfite, etc., which can be used alone or in combination of two or more. Preservatives include, for example, methylparaben, propylparaben, phenoxyethanol, etc. Antioxidants include tocopherol acetate, ascorbic acid, butylhydroxytoluene, tocopherol, etc. Plasticizers include fatty acid esters, crotamiton, vegetable oil, etc. Surfactants include cetanol, polyglycerin fatty acid esters, polyoxyethylene alkyl ethers, sorbitan fatty acid esters, polyoxyethylene hydrogenated castor oil, propylene glycol fatty acid esters, sorbitan monooleate, oleyl ether, etc.

[0047] An example of how to prepare the water-containing gel sheet of the present invention is as follows. In the present invention, a water-containing gel is coated onto a support, and a release film can be laminated on both sides of the water-containing gel. The release film is preferably a plastic film such as polyester, polyethylene, nylon, polyvinyl chloride, or polypropylene, and a laminate of two or more of these may be used. The surface of the plastic film may also be coated with silicone or the like, and the material composition may be different on the front and back. The thickness of the plastic film used in the present invention is 12 to 210 μm, preferably 30 to 125 μm. When dividing the film during use, it is possible to make perforations or half-cuts at desired positions.

[0048] The hydrated gel sheet can be obtained, for example, by placing a support on top of a first release film and coating the support with a hydrated gel containing predetermined components. Subsequently, a second release film can be attached to the side of the hydrated gel layer opposite to the side to which the first release film is attached.

[0049] The water-containing gel sheet produced in this manner is cut to the desired size and shape according to the area to be applied, and used by applying it to the chin, cheeks, forehead, elbows, around the eyes, calves, upper arms, knees, etc.

[0050] The method of using the water-containing gel sheet of the present invention is as follows: First, peel off the first release film and apply that side to the desired position on the skin. Next, apply pressure from the second release film side to ensure it adheres firmly to the skin. After that, peel off the second release film and use the sheet.

[0051] Furthermore, in the present invention, the water-containing gel sheet can be subjected to conventional sterilization methods such as radiation sterilization, electron beam sterilization, and ethylene oxide sterilization, if necessary. [Examples]

[0052] The following describes in more detail one embodiment of the present invention with reference to examples, but the present invention is not limited in any way to these examples.

[0053] Example 1 Figure 1 shows a cross-section of a hydrated gel sheet according to one embodiment of the present invention. This example shows the use of first and second release films. That is, it is an example of a hydrated gel sheet in which a hydrated gel is held on a support and release films are laminated on both sides of the hydrated gel, and has a four-layer structure consisting of a hydrated gel layer, a support layer placed in the center of the hydrated gel layer, and release film layers laminated on both sides of the hydrated gel layer. In Figure 1, it appears that the hydrated gel layer is laminated on both sides of the support, but in reality, the hydrated gel also penetrates into the interior of the support, and the gel layer seeps through to the opposite side of the support.

[0054] The support material used was a cotton nonwoven fabric that becomes more flexible when it absorbs water. In this example, the hydrated gel mainly consists of an acrylic acid polymer, and its gel strength and tackiness are improved by crosslinking it with a crosslinking agent. Furthermore, the handling of the product is improved by laminating a release film on both sides of the hydrated gel.

[0055] A hydrated gel sheet for Example 1 was prepared according to the composition shown in Table 1 below. Table 1 shows the components of the hydrated gel sheet. Concentrated glycerin was used as the polyhydric alcohol, fully neutralized polyacrylic acid, partially neutralized polyacrylic acid, and hydroxypropyl cellulose were used as the water-soluble polymers, and dihydroxyaluminum aminoacetate was used as the crosslinking agent.

[0056] [Table 1]

[0057] First, concentrated glycerin was dispersed with completely neutralized polyacrylic acid, partially neutralized polyacrylic acid, hydroxypropyl cellulose, and dihydroxyaluminum aminoacetate (dispersion).

[0058] Next, purified water was mixed with sodium edetate and tartaric acid, and the dispersion was gradually added while stirring this solution. Then castor oil and the active ingredients were added and stirred to prepare the ointment solution.

[0059] Furthermore, the ointment solution was spread while sandwiching a support between a first release film (polyester, thickness: 75 μm) and a second release film (polyester, thickness: 38 μm), and then cut to the appropriate dimensions to produce the desired water-containing gel sheet.

[0060] The specifications of the cotton nonwoven fabric used as the support are as follows: • Cotton content: 100% • Weight: 30g / m² 2 • Seat space ratio: 25% • Manufacturing method: Spun lace

[0061] Thus, it was found that the water-containing gel sheet, in which a support made of cotton nonwoven fabric is placed at the center of the water-containing gel layer, does not drip from the sheet and has superior skin adhesion compared to conventional impregnation-type gel sheets. Furthermore, it was found that the water-containing gel sheet of the present invention has the advantage of providing a safe and natural feeling of adhesion compared to patch-type gel sheets, because the support is different from conventional synthetic fibers and becomes more flexible when it absorbs moisture. [Industrial applicability]

[0062] The water-containing gel sheet of the present invention does not leak water-containing gel components from the sheet, possesses high adhesion to the skin, and has an excellent feel when applied, making it useful as an excellent cosmetic product.

Claims

1. A water-containing gel sheet comprising a first water-containing gel, a support placed on the first water-containing gel, and a second water-containing gel placed on the support.

2. The water-containing gel sheet according to claim 1, characterized in that it has a first release film beneath the first water-containing gel.

3. The water-containing gel sheet according to claim 1 or 2, characterized in that it has a second release film on the second water-containing gel.

4. The water-containing gel sheet according to claim 1, characterized in that the support is made of a nonwoven fabric containing cotton.

5. The water-containing gel sheet according to claim 1, characterized in that the components of the first water-containing gel and / or the second water-containing gel are permeated into the interior of the support.

6. The water-containing gel sheet according to claim 1, characterized in that the components of the first water-containing gel and / or the second water-containing gel contain a water-soluble polymer including an acrylic acid polymer, a polyhydric alcohol, a crosslinking agent, and water.

7. The water-containing gel sheet according to claim 2 or 3, characterized in that the material of the first release film and / or the second release film is at least one selected from the group consisting of polyester, polyethylene, nylon, polyvinyl chloride, or polypropylene.

8. The water-soluble polymer containing the acrylic acid polymer is blended in an amount of 6 to 25% by mass relative to the total amount of the water-containing gel sheet according to claim 6.

9. The aqueous gel sheet according to claim 6, characterized in that the amount of the polyhydric alcohol is 5 to 40% by mass relative to the total amount of the aqueous gel.

10. The water-containing gel sheet according to claim 6, characterized in that the amount of the crosslinking agent is 0.02 to 4% by mass relative to the total amount of the water-containing gel.

11. The water-containing gel sheet according to claim 6, characterized in that the amount of water added is 20 to 85% by mass relative to the total amount of the water-containing gel.

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