TW202342140A - Gel sheet for cosmetic pack - Google Patents

Abstract

An object of the present invention is to provide a gel sheet for a cosmetic pack in which the droplet size of an oil agent on the surface of the gel sheet is small. The gel sheet for cosmetic pack contains synthetic polymer with network structure, oil agent, exudate, wetting agent and water, wherein the average diameter of the oil agent on the surface of the gel sheet is 5 [mu]m or less.

Description

Gel sheet for cosmetic facial mask

The present invention relates to gel sheets for cosmetic facial masks.

As an external preparation for skin application, a hydrogel composition containing water is known.

Patent Document 1 discloses an external patch, which is composed of a sheet-shaped support and a gel base laminated on one side of the support. The gel base is attached to the user's skin surface after being heated. , the gel base of the external patch is composed of a gel containing oil droplets. The oil droplet-containing gel contains an oily component with a melting point of 35 to 47°C, and is used to disperse the oil component as oil droplets in Surfactant in hydrogels.

Patent Document 2 discloses a gel composition for skin application, which contains: 1 to 25 mass % of aqueous oil, 0.4 to 6 mass % of phospholipids, and 0.1 to 10 mass % of acrylic polymer, which can form a gel. The water-soluble polysaccharides of the glue are 0.1 to 10% by mass, and water.

[Prior technical literature]

[Patent Document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2020-7275

[Patent Document 2] Japanese Patent Application Publication No. 2019-26562

The external patch in Patent Document 1 is designed to provide effective warmth, and it contains an oil component with a melting point of 35 to 47° C. to achieve sustained warmth. The oil component that forms the oil droplets does not bleed out of the gel base.

The aqueous oil agent in Patent Document 2 is a method where the gel composition for skin patching is applied to the skin and then migrates from the gel composition for gel patching to the skin, thereby exerting the effect of the aqueous oil agent on the skin. Moisturizing effect. However, in the gel skeleton of Patent Document 2, water-soluble polysaccharides are used, and the oil agent is an aqueous oil agent. In Patent Document 2, phospholipid is used as an emulsifier in order to mix an aqueous oil agent and water. However, the oil droplet size of the oil agent on the gel surface was not reported.

An object of the present invention is to provide a gel sheet for a cosmetic facial mask in which the size of the oil droplets on the surface of the gel sheet is small and the skin moisturizing effect is excellent in sustainability, and a manufacturing method thereof.

The present invention includes the following embodiments.

Item 1.

A gel sheet for cosmetic facial mask, which contains: a synthetic polymer with a mesh structure, an oil agent, an exuding agent, a wetting agent, and water, wherein the average diameter of the oil agent on the surface of the gel sheet is 5 μm or less.

Item 2.

The gel sheet for cosmetic facial mask according to item 1, wherein the oil agent contains one or more types selected from the group consisting of hydrocarbons, waxes, and oils and fats.

Item 3.

The gel sheet for cosmetic facial mask according to item 1 or 2, wherein the gel sheet for cosmetic facial mask contains 0.1 to 20 mass % of the aforementioned exuding agent.

Item 4.

The gel sheet for cosmetic facial mask according to any one of items 1 to 3, wherein the exuding agent contains a nonionic water-soluble polymer.

Item 5.

The gel sheet for cosmetic facial mask according to any one of items 1 to 4, wherein the synthetic polymer having a network structure is a polymer of a polymerizable unsaturated monomer having an anionic functional group or such polymers. Salt, cross-linked product with cross-linking agent.

Item 6.

The gel sheet for cosmetic facial mask according to any one of items 1 to 5, further contains: a nonionic surfactant with an HLB value of 6 or less, and a nonionic surfactant with an HLB value of 10 or more.

Item 7.

The gel sheet for cosmetic facial masks according to item 6, wherein both the nonionic surfactant with an HLB value of 6 or less and the nonionic surfactant with an HLB value of 10 or more are polyglycerol fatty acid esters.

Item 8.

The gel sheet for cosmetic facial mask according to item 6 or 7, which contains: 0.5 mass % or more of the nonionic surfactant with the aforementioned HLB value of 6 or less, and 0.5 mass % or more of the aforementioned HLB value of 10 or more Nonionic surfactant.

Item 9.

A method for manufacturing a gel sheet for cosmetic facial mask according to any one of items 1 to 8, which includes the following steps:

The step of mixing an oil agent with a nonionic surfactant added with an HLB value of 6 or less and water with a nonionic surfactant added with an HLB value of 10 or more to prepare an emulsion; and

Mix a polymer of a polymerizable unsaturated monomer with anionic functional groups or a salt of such a polymer, an exuding agent, a wetting agent, a cross-linking agent, water, and the aforementioned emulsion to form a gel with a network structure. The steps of forming a composition.

According to the present invention, it is possible to provide a gel sheet for a cosmetic facial mask in which the oil droplet size of the oil agent on the surface of the gel sheet is small and the moisturizing effect is excellent in sustainability, and a manufacturing method thereof.

10L, 10R, 20, 20L, 20U: Gel sheet for cosmetic facial mask

22,23:Through hole

24,25: slit

Fig. 1 is a top view of a gel sheet for cosmetic facial mask according to an embodiment of the present invention.

Fig. 2 is a top view of a gel sheet for cosmetic facial mask according to another embodiment of the present invention.

Fig. 3 is a top view of a gel sheet for cosmetic facial mask according to another embodiment of the present invention.

Fig. 4 is a top view of a gel sheet for cosmetic facial mask according to another embodiment of the present invention.

FIG. 5 is a graph showing the relationship between the HLB value of the surfactant used in the Examples and Comparative Examples and the stability of the emulsion.

In this specification, "comprise" is a concept that also includes "consist essentially of" and "consist of".

In the numerical ranges described in stages in this specification, the upper limit or lower limit of the numerical range in a certain stage can be arbitrarily combined with the upper limit or lower limit of the numerical range in other stages. Furthermore, in the numerical range described in this specification, the upper limit value or the lower limit value of the numerical range may be replaced by the value represented by the embodiment or a value clearly derived from the embodiment. Furthermore, the numerical values linked with "to" in this specification mean the numerical range including the numerical values before and after "to" as the lower limit and upper limit.

In one aspect of the present invention, there is provided a gel sheet for a cosmetic facial mask containing a synthetic polymer having a network structure, an oil agent, an exuding agent, a wetting agent, and water, wherein the average diameter of the oil agent on the surface of the gel sheet is is less than 5μm.

(Synthetic polymer with mesh structure)

The synthetic polymer having a network structure is not particularly limited as long as it contains at least water and can form a gel. When hydrogels are used for transdermal applications in the field of cosmetics, synthetic polymers permitted in this field can be used. In particular, synthetic polymers with affinity for water are used. For example, a synthetic polymer having a network structure is a cross-linked product of a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt thereof, and a cross-linking agent.

Examples of polymers of polymerizable unsaturated monomers having anionic functional groups and their salts include: polyacrylic acid, which is an acrylic polymer having a carboxyl group as a functional group, or methacrylic acid polymer, which has a carboxyl group as a functional group. Polymethacrylic acid, and its sodium salts, potassium salts, and triethanolamine salts; polymers of tert-butylacrylamide sulfonic acid having a sulfonic acid group as a functional group, and its sodium salts, potassium salts, etc. . Sodium polyacrylate is suitably used as a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt thereof. By using sodium polyacrylate as the skeleton of a synthetic polymer with a network structure, It can inhibit the exudation of humectants from hydrogels (and gel sheets for cosmetic masks) caused by exudation agents, and inhibit the corresponding leakage of moisture from the skin caused by the supply of oils on the gel surface to the skin. Evaporate.

In the gel sheet, the preferred content of the polymer of the polymerizable unsaturated monomer with anionic functional groups or its salt before cross-linking is 0.50 to 35% by mass.

In addition, in consideration of handleability during production, the polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt thereof before being cross-linked with a cross-linking agent preferably has a weight average molecular weight of 100,000 to 5,000,000. Scope.

A synthetic polymer having a network structure can be obtained by cross-linking a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt thereof. That is, a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt thereof and a cross-linking agent (for example, a cross-linking agent is added to a polymer of a polymerizable unsaturated monomer having an anionic functional group). or its salt) are mixed and heated as required to obtain a synthetic polymer with a network structure.

Examples of the cross-linking agent include: aluminum hydroxide, potassium alum, aluminum sulfate, aluminum glycinate, aluminum acetate, aluminum oxide, aluminum metasilicate, magnesium chloride, calcium hydroxide, calcium carbonate, Magnesium aluminosilicate metasilicate, polyethyleneimine, polyethylene glycol diglycidyl ether, glyceryl triglycidyl ether, isocyanuric acid triglycidyl ether, etc. These cross-linking agents can be used alone or in mixture of two or more types.

In gel sheets for cosmetic facial masks, the preferred content of the cross-linking agent is 0.10 to 5.0% by mass.

(oil agent)

The oil used in the gel sheet for cosmetic facial mask is not particularly limited as long as it is an oil component suitable for being delivered to the skin.

The oil agent preferably contains one or more types selected from the group consisting of hydrocarbons, waxes, and fats and oils. When using these oils, the oil exuded from the cosmetic mask gel sheet adheres to the skin, inhibiting the evaporation of water from the skin, thereby achieving a sustained moisturizing effect on the skin.

Preferable specific hydrocarbons include, but are not limited to, squalane, petrolatum, mineral oil, etc.

Preferred waxes include: jojoba seed oil, beeswax, etc., but are not limited to these.

Preferable oils and fats include: olive oil, Hawaiian bean oil, Argan Oil, Shea Butter, coconut oil, grape seed oil and other vegetable oils; horse oil and other animal oils, etc. It is not limited to this.

In gel sheets for cosmetic facial masks, the preferred content of oil is 0.10 to 10% by mass. A more preferable content is 1.0 to 8.0% by mass.

In terms of skin moisturizing effect, 0.10% by mass or more is preferred. Furthermore, from the viewpoint of emulsification stability, it is preferably 10 mass% or less.

(Exudate)

The exuding agent is an agent used to effectively infiltrate the solution in the hydrogel of the gel sheet for cosmetic facial mask onto the surface of the hydrogel. Also known as solution exudation accelerator. For example, by blending a hydrophilic and a certain degree of hydrophobicity as an exuding agent, the solution or water in the hydrogel can be efficiently discharged. The solution (exudate) that exudes to the surface of the hydrogel, that is, to the outside of the gel sheet for cosmetic facial masks, migrates to the skin in contact with the gel sheet for cosmetic facial masks.

Preferred exuding agents include: nonionic water-soluble polymers and electrolytes.

Several non-ionic water-soluble polymer systems are hydrophilic and have a certain degree of hydrophobicity, and can effectively spit out the solution or water in the hydrogel. Preferred nonionic water-soluble polymers include glycols such as polyethylene glycol, polypropylene glycol, and polyglycerol, and polymers such as polyols. These nonionic water-soluble polymers can be used alone or in mixture of two or more types.

In particular, when the moisture absorption of glycerin is taken as 100, it is preferable to use a nonionic water-soluble polymer with a relative moisture absorption in the range of 2 to 55. Since the water retention capacity is insufficient, in terms of good affinity with the synthetic polymer constituting the hydrogel, the relative moisture absorption is preferably 2 or more. In order to prevent the solution in the hydrogel from flowing out to the surface of the hydrogel due to the water-retaining power of the non-ionic water-soluble polymer, and to ensure a moisturizing and moisturizing effect, the relative moisture absorption is better. is below 55. A better relative humidity absorption range is 20 to 45.

Furthermore, several electrolytes have the effect of tightening the network structure of the hydrogel, thereby allowing the solution in the hydrogel to seep out to the surface of the hydrogel. Preferred electrolytes can be used as long as they are easily water-soluble and have a history of use in cosmetics and the like. Neutral salts of strong acids and strong bases are suitably used from the viewpoint of solubility and small pH changes. Examples of such electrolytes include: sodium chloride, potassium chloride, sodium sulfate, potassium sulfate, etc. These electrolytes can be used alone or in mixture of two or more types.

In the gel sheet for cosmetic facial mask, the preferred content of the exuding agent is 0.10 to 20 mass%, more preferably 1.0 to 10 mass%. When the exuding agent is a nonionic water-soluble polymer or an electrolyte, the preferred content of the exuding agent in the gel sheet for cosmetic facial mask is 0.10 to 20 mass %, and more preferably 1.0 to 10 mass %.

In terms of adhesion and bleeding effects, the content of the bleeding agent is preferably 0.10% by mass or more. Furthermore, from the viewpoint of preventing liquid dripping, the content of the exuding agent is preferably 20% by mass or less.

(wetting agent)

Gel sheets for cosmetic facial masks contain humectants.

Examples of the humectant include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol (DPG: Dipropylene Glycol), glycerol, diglycerin, isopropylene glycol, and 1,3-butanediol (1,3 -BG: 1,3-butylene Glycol), Sorbitol, maltitol, Trehalose, Raffinose, Xylitol, Mannitol, Hyaluronic acid (Hyaluronic Acid) and its salts, various derivatives of cocoon sugar or raffinose, trimethylglycine, cyclodextrin (Cyclodextrin), hyaluronic acid and its salts and other glycols, polyols and polysaccharides wait. These humectants can be used alone or in combination of two or more types.

In gel sheets for cosmetic facial masks, the preferred content of the humectant is 1.0 to 50% by mass.

(Nonionic surfactant)

The gel sheet for cosmetic facial mask may also contain a nonionic active agent for the purpose of improving the stability of the emulsion when the oil is dispersed in water and configuring the average diameter of the oil on the surface of the gel sheet for cosmetic facial mask to 5 μm or less. .

The nonionic surfactant preferably contains a nonionic surfactant with an HLB value of 6 or less and a nonionic surfactant with an HLB value of 10 or more. As explained in the manufacturing method of the gel sheet for cosmetic facial mask described later, when predetermined nonionic surfactants with different HLB values are used to disperse the oil, the emulsification can be stabilized and the average diameter of the oil droplets on the gel surface can be reduced. Control it below 5μm.

The HLB value (Hydrophile-Lipophile Balance) is a value indicating the affinity of a surfactant for water and oil, and is a parameter known as the hydrophilicity-lipophile balance.

The HLB value can be easily obtained by commonly known calculation methods such as Griffin's method, Davies' method, Atlas method, and Kawakami's method. In this specification, the HLB value can be calculated by the Atlas method of equation (1) shown below. Furthermore, the saponification value and neutralization value in formula (1) can be determined in accordance with Nippon Oil & Chemical Co., Ltd. It is obtained based on the method published in the 2003 edition of the Standard Oil and Fat Analysis Test Method (established by the Japan Petroleum Chemistry Society) edited by the Society.

HLB=20(1-S/A)...(1)

S is the saponification value of the ester, and A is the neutralization value of the fatty acid.

The saponification value is the number of mg of potassium hydroxide consumed when hydrolyzing 1g of the fatty acid ester of the polyol with potassium hydroxide. The neutralization value is the amount of mg of potassium hydroxide required to neutralize 1g of the fatty acid constituting the fatty acid ester of the polyol. mg of potassium hydroxide.

The HLB value of conventional surfactants is well known. Those with ordinary knowledge in the art can appropriately select nonionic surfactants with an HLB value of 6 or less and nonionic surfactants with an HLB value of 10 or more.

The nonionic surfactant is not particularly limited as long as it is a nonionic surfactant with an HLB value of 6 or less and a nonionic surfactant with an HLB value of 10 or more. Examples include sorbitan fatty acid esters and glycerin fats. Acid ester, polyglycerol fatty acid ester, propylene glycol fatty acid ester, polyethylene glycol fatty acid ester, sucrose fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether , polyoxyethylene sorbitol fatty acid ester, polyoxyethylene glycerol fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hardened castor oil, polyoxyethylene hardened castor oil fatty acid ester, Polyethylene Phytostanol Ether, Polyethylene Phytosterols Ether, Polyethylene Cholestanol Ether, Polyethylene Cholesteryl Ether, Polyoxyethylene Alkene-modified organopolysiloxane, polyoxyalkylene/alkyl co-modified organopolysiloxane, etc., and one or two or more types selected from these can be used. More preferably, it is polyglycerol fatty acid ester.

The nonionic surfactant with an HLB value of 6 or less can be any nonionic surfactant with an HLB value of 6 or less. Examples include: polyglycerol-2 oleate, polyglycerol-4 stearate, polyglycerol -2 stearate, polyglyceryl-2 isostearate, polyglyceryl-2 diisostearate, polyglyceryl-2 triisostearate, etc., preferably polyglyceryl-2 oleate , polyglyceryl-4 isostearate, polyglyceryl-2 diisostearate. The number of nonionic surfactants with an HLB value of 6 or less may be one type or two or more types.

The nonionic surfactant with an HLB value of 10 or more can be any nonionic surfactant with an HLB value of 10 or more. Examples include: polyglycerol-4 laurate, polyglycerol-6 laurate, polyglycerol- 10-laurate, polyglyceryl-6 myristate, polyglyceryl-10 myristate, polyglyceryl-10 palmitate, polyglyceryl-10 stearate, polyglyceryl-10 diisostearate etc., preferably polyglycerol-4 laurate, polyglycerol-6 laurate, and polyglycerol-10 laurate. The number of nonionic surfactants with an HLB value of 10 or more may be one type or two or more types.

The gel sheet for cosmetic facial mask preferably contains a nonionic surfactant with an HLB value of 6 or less and a nonionic surfactant with an HLB value of 10 or more, both of which are polyglycerol fatty acid esters. According to such a structure, the oil agent can be dispersed more effectively, the emulsion can be stabilized, and the average diameter of the oil agent on the surface of the cosmetic facial mask gel sheet can be controlled to 5 μm or less.

In gel sheets for cosmetic facial masks, the preferred content of nonionic surfactants with an HLB value of 6 or less is 0.50 to 5.0% by mass.

In gel sheets for cosmetic facial masks, the preferred content of nonionic surfactants with an HLB value of 10 or more is 0.50 to 5.0% by mass.

In terms of dispersing the oil agent, stabilizing the emulsification, and controlling the average diameter of the oil agent on the surface of the gel sheet for cosmetic facial masks to be 5 μm or less, it is more preferable to use gel for cosmetic facial masks. In the tablet, the content of nonionic surfactants with an HLB value of 6 or less is 0.50 to 5.0% by mass, and the content of nonionic surfactants with an HLB value of 10 or more is 0.50 to 5.0% by mass.

Gel sheets for cosmetic facial masks may also contain nonionic surfactants other than nonionic surfactants with an HLB value of 6 or less and nonionic surfactants with an HLB value of 10 or more.

(Tackifier)

In order to increase the viscosity of the hydrogel and the gel sheet for cosmetic facial mask, the gel sheet for cosmetic facial mask may further contain a viscosity enhancer.

Preferred thickeners include: cellulose, guar gum (Guar Gum), cationized guar gum, starch, xanthan gum (Xanthan Gum), hydroxypropyl guar gum and other polysaccharides; Its derivatives etc. Hydroxypropyl guar gum is more preferable in terms of improved dripping properties, improved adhesion, and/or moisturizing feeling after use.

Hydroxypropyl guar gum is made from the natural water-soluble polymer polysaccharide guar gum contained in the endosperm part of the seeds of guar beans, which is a leguminous plant, and is mixed with sodium hydroxide and cyclic A nonionic polymer obtained by substituting a hydroxyl group with a hydroxypropyl group through a reaction with propane oxypropane.

The degree of substitution of the hydroxypropyl group in hydroxypropyl guar gum is preferably 0.4 to 1.2. More preferably, the value is 0.6 to 1.0, and the effect is higher.

In gel sheets for cosmetic facial masks, the preferred content of the tackifier is 0.050 to 3.0% by mass. In terms of improvement in liquid dripping properties, improvement in adhesion, and/or moisturizing feeling after use, 0.050% by mass or more is preferred in order to suppress an increase in viscosity and a strong sticky feeling. Specifically, it is preferably 3.0% by mass or less.

When the thickening agent is hydroxypropyl guar gum, in the gel sheet for cosmetic facial mask, it is preferably 0.050 to 3.0 mass%, more preferably 0.050 to 2.0 mass%, and most preferably 0.10 to 1.0 mass%.

(pH adjuster)

In order to adjust the pH optimally for the action of the cross-linking agent and perform cross-linking more reliably, gel sheets for cosmetic masks may contain citric acid, etc. in addition to α-hydroxy acids such as tartaric acid, lactic acid, and glycolic acid. Various organic acids or inorganic acids such as hydrochloric acid are used as pH adjusters. These pH adjusters can be used alone or in mixture of two or more types.

In gel sheets for cosmetic facial masks, the preferred content of pH adjuster is 0.10 to 10% by mass.

(water)

In total, water is preferably 45 to 97% by mass, more preferably 50 to 95% by mass relative to the gel sheet for cosmetic facial mask.

The gel sheet for cosmetic facial mask according to the embodiment of the present invention may contain components other than the above-mentioned components. Examples of the component include preservatives, antioxidants, antibacterial agents, medicinal ingredients, chelating agents, fragrances and coloring materials. These components are added within a range that does not impair the effects of the present invention.

In the gel sheet for cosmetic facial mask according to the embodiment of the present invention, the average diameter of the oil on the surface of the gel sheet is 5 μm or less. In this specification, the average diameter of oil droplets is defined as the average diameter of more than 100 oil droplets on the surface of the gel sheet observed with an optical microscope. The average diameter of the oil droplets is more preferably defined as the average value of the diameters of more than 100 oil droplets observed with an optical microscope. When the average diameter of the oil in the conventional gel sheet for cosmetic facial mask is in the range of more than 5 μm, the size of the oil droplets on the gel surface of the gel sheet for cosmetic facial mask according to the embodiment of the present invention is smaller than this. Since the size of the oil droplets is small, the oil droplets on the surface of the gel sheet seep out efficiently, making it easy to supply oil to the skin. By suppressing the exudation of the humectant from the gel caused by the exuding agent and suppressing the evaporation of water caused by the supply of the oil on the surface of the gel to the skin, a sustained moisturizing effect on the skin is obtained.

In the cosmetic facial mask gel sheet according to the embodiment of the present invention, an intermediate base material may be embedded along the in-plane direction.

It may also be laminated with a base material made of non-woven fabric or woven fabric, or may be embedded in a base material made of non-woven fabric or woven fabric. The in-plane direction of the hydrogel here means any direction in a plane orthogonal to the thickness direction of the hydrogel. By having an intermediate base material, it is beneficial to the reinforcement of the hydrogel and the improvement of shape retention during cutting. The specific form of the intermediate substrate can be composed of non-woven fabric or woven fabric. Non-woven fabrics and woven fabrics can be made of: natural fibers such as cellulose, silk, and linen; synthetic fibers such as polyester, nylon, polyester, polyethylene, polypropylene, and polyurethane; or blends of these. Adhesives can also be used as needed.

The manufacturing method of nonwoven fabrics is not particularly limited, and can be listed as: dry method or wet method, spun bonding method, melt blowing method, air-laid method, chemical bonding method, thermal bonding method, needle rolling method, and water flow interweaving method. It is better to use a manufacturing method that responds to the weight per unit area or material, so as to control the position of the intermediate substrate without causing uneven weight per unit area. The weave is not particularly limited, and plain weave, Tricot weave, Raschel weave, etc. can be appropriately selected.

Furthermore, the weight per unit area of the woven fabric or non-woven fabric is not particularly limited as long as it can obtain predetermined physical properties as the intermediate substrate. For example, 10 to 40 g/m ² is preferred, and 10 to 28 g/m 2 is more preferred. ^m2 . If the unit area weight of the above-mentioned woven fabric or non-woven fabric is too small, the gel sheet cannot be reinforced, or the unit area weight unevenly increases, and the liquid permeability changes depending on the location during the production of the gel sheet, which may cause intermediate The position of the base material changes. Furthermore, if the weight per unit area is too large, the intermediate base material will become hard, which may impair the followability of the hydrogel to the skin or may have a negative impact on conductivity. Therefore, the appropriate setting should be made taking into account these balances. .

If the thickness of the intermediate base material is too thick, the liquid permeability may become poor and conductivity may be adversely affected. On the contrary, if the thickness of the intermediate base material is too thin, the same as the case where the weight per unit area is too small, it may not be achieved. Reinforcement of the gel sheet, etc. may cause changes in the position of the intermediate base material, so consider this and set appropriately. Preferably, it is within the range of 0.050mm to 2.0mm. Furthermore, the preferred range is 0.050mm to 0.50mm, and the particularly preferred range is 0.080mm to 0.30mm.

The thickness of the gel sheet for cosmetic facial mask of the present invention (when the gel sheet for cosmetic facial mask includes a base material, the thickness of the base material is included) may be uniform as a whole, or may have a partially different thickness. In order to ensure adhesion, transparency, For strength, the thickness is preferably 0.10 to 3.0mm, more preferably 0.20 to 2.0mm. In terms of strength of the gel sheet, it is preferably 0.1 mm or more, and in terms of adhesion that the gel sheet itself does not become too heavy, it is preferably 3.0 mm or less.

Gel sheets for cosmetic masks used in skin care are widely known. Figure 1 shows gel sheets 10L and 10R for cosmetic masks for use under the left eye and right under the eye, respectively. Figure 2 shows a gel sheet 20 for a cosmetic facial mask that is attached to facial skin. FIG. 3 shows a gel sheet 20U for a cosmetic mask having a size corresponding to the upper half of the face. FIG. 4 shows a gel sheet 20L for a cosmetic mask having a size corresponding to the lower half of the face.

A pair of cosmetic facial mask gel sheets 10L and 10R shown in FIG. 1 are respectively a cosmetic facial mask gel sheet for use under the left eye and a right under eye. The gel sheet 10L for cosmetic masks has a shape in which the substantially arc-shaped outline on the lower side is along the lower eyelid of the left eye in FIG. 1, and is attached to the left eye in such a manner that the outline is along the lower eyelid of the left eye. Use directly underneath the skin. The gel sheet 10R for cosmetic masks has a shape in which the upper side has a substantially arc-shaped outline along the lower eyelid of the right eye in FIG. Use it on the underlying skin.

The shape of the gel sheet for cosmetic mask used to be attached to the face is not limited to the shape shown in Figure 1, and may be a shape corresponding to the entire face as shown in Figure 2. The gel sheet 20 for a cosmetic mask shown in FIG. 2 is formed as a gel sheet for a whole face corresponding to the overall size of the face, and is formed to have two through holes 22 provided in a portion corresponding to the eyes. Set at the position corresponding to the mouth The through-hole 23 of the part, the slit 24 provided in the part corresponding to the nose, and the slit 25 provided in the part corresponding to the jaw are generally circular sheets, and have a curved surface that can follow the face. Adjust the positions of the through holes 22 and 23 and the slits 24 and 25 by attaching it to the entire face.

Furthermore, the gel sheet for cosmetic facial mask used to be attached to the face may also be a gel sheet for cosmetic facial mask 20U formed to correspond to the size of the upper half of the face as shown in Figure 3, or as shown in Figure 4. The gel sheet 20L for a cosmetic mask is formed into a size corresponding to the lower half of the face. At this time, the gel sheet 20U for a cosmetic facial mask formed to correspond to the size of the upper half of the face and the gel sheet 20L for a cosmetic facial mask formed to correspond to the size of the lower half of the face can be used individually, or they can be used in combination with each other and attached to each other. on the face as a whole. The size corresponding to the upper half of the face here means the size that does not include the part corresponding to the jaw and the part corresponding to the face, but at least includes the size corresponding to the forehead. The so-called size corresponding to the lower half of the face The size of the head means that although it does not include the part corresponding to the forehead, it at least includes the part corresponding to the jaw and the part corresponding to the face. In FIGS. 3 and 4 , the same components as in FIG. 2 are assigned the same reference numerals and the description thereof is omitted.

In addition, the gel sheet for a cosmetic facial mask according to the embodiment of the present invention may be a gel sheet for a cosmetic facial mask that is attached to parts other than the face, such as the surface of the hand.

Among several embodiments, the gel sheet for cosmetic facial mask according to the embodiment of the present invention excludes the following gel composition for skin attachment, which contains: 1 to 25% by mass of aqueous oil, 0.4 phospholipid to 6% by mass, 0.1 to 10% by mass of acrylic polymer, 0.1 to 10% by mass of water-soluble polysaccharides capable of forming gel, and water.

(manufacturing method)

In another aspect of the present invention, a method for manufacturing the above-mentioned gel sheet for cosmetic facial mask is provided. The method includes: adding an oil agent with a nonionic surfactant with an HLB value of 6 or less, and adding The step of mixing water with a nonionic surfactant with an HLB value of 10 or more to prepare an emulsion; and the step of mixing a polymer of a polymerizable unsaturated monomer with anionic functional groups or a salt of such a polymer, an exuding agent, A step of mixing a wetting agent, a cross-linking agent, water, and the aforementioned emulsion to form a gel composition with a network structure.

First, an oil agent to which a nonionic surfactant with an HLB value of 6 or less is added, and water to which a nonionic surfactant with an HLB value of 10 or more is added are mixed to prepare an emulsion. The nonionic surfactant with an HLB value of 6 or less and the nonionic surfactant with an HLB value of 10 or more are as described in the ingredients of the above-mentioned gel sheet for cosmetic facial mask.

When predetermined nonionic surfactants with different HLB values are used and the oil agent and water are mixed and dispersed, the emulsification of the emulsion becomes stable.

Next, a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt of such a polymer, an exuding agent, a wetting agent, a cross-linking agent, water, and the above-mentioned emulsion are mixed so as to have anionic functional groups. The polymer based on the polymerizable unsaturated monomer or the salt of the polymer reacts with the cross-linking agent to obtain a gelled composition having a network structure.

Since the emulsion is stabilized, the emulsion is further mixed with a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt of such a polymer, an exuding agent, a cross-linking agent, a wetting agent, and water. The subsequent composition is also stable in the slurry state. Even if the slurry is gelled, the average diameter of the oil droplets on the gel surface can be controlled to less than 5 μm. In the slurry, a pH adjuster is preferably added to adjust the pH of the slurry to 4 to 7 to promote cross-linking of polymers of polymerizable unsaturated monomers with anionic functional groups or salts of such polymers. reaction to the agent.

When mixing polymers of polymerizable unsaturated monomers with anionic functional groups or salts of these polymers, exuding agents, cross-linking agents, wetting agents, water, and emulsions, they can be mixed at once. These ingredients may be added separately and mixed. In order to achieve homogeneous dispersion of the tackifier in the hydrogel, it is better to pre-mix the tackifier with a polymer of polymerizable unsaturated monomers with anionic functional groups or such polymers before the formation of the gel. of salt and wetting agent. The exudate can be mixed together with this mixture or added later. Then, preferably, a cross-linking agent is further added to the mixture to produce a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt of such a polymer reacts with the cross-linking agent. Other ingredients can be added in due course before gelling.

The added nonionic surfactant is only one type of nonionic surfactant with an HLB value of 6 or less, a nonionic surfactant with an HLB value of 10 or more, and only two types of nonionic surfactant with an HLB value of 6 or less. When using surfactants, only two types of nonionic surfactants with an HLB value of 10 or more, or only using nonionic surfactants with an HLB value of greater than 6 and less than 10, a stable emulsion cannot be formed and the gel surface The oil droplet size is greater than 5μm.

In the above method for manufacturing a gel sheet for a cosmetic facial mask, first, a nonionic surfactant with an HLB value of 6 or less is added to the oil, and a nonionic surfactant with an HLB value of 10 or more is added to the water. mix to create an emulsion.

The ratio of the nonionic surfactant with an HLB value of 6 or less to the oil agent is preferably 0.1 to 0.5 in terms of mass ratio.

The ratio of the nonionic surfactant with an HLB value of 10 or more relative to water is preferably 0.01 to 1 in terms of mass ratio.

Next, a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt of the polymer, an optional thickener, a wetting agent, and water are mixed to prepare a mixed liquid.

The ratio of polymers of polymerizable unsaturated monomers with anionic functional groups or salts of such polymers, wetting agents, and water is preferably 0.5 to 35: 1 to 50: 45 to 97 in terms of mass ratio, and more The preferred range is 1 to 30: 2 to 35: 50 to 95, and the preferred range is 2 to 25: 3 to 30: 55 to 90.

When using a tackifier, the ratio of polymers of polymerizable unsaturated monomers with anionic functional groups or salts of such polymers, tackifiers, wetting agents, and water is preferably from 0.5 to 0.5 in terms of mass ratio. 35: 0.05 to 3: 1 to 50: 45 to 97, preferably 1 to 30: 0.1 to 2:2 to 35: 50 to 95, preferably 2 to 25: 0.2 to 1:3 to 30: 55 to 90.

In the gel sheet for cosmetic facial mask, the exuding agent is preferably added in an amount of 0.10 to 20% by mass, more preferably 1.0 to 10% by mass.

In the gel sheet for cosmetic facial mask, the cross-linking agent is preferably added in an amount of 0.10 to 5.0% by mass.

The pH adjuster is added so that the pH of the mixed solution becomes 4 to 7.

In a preferred embodiment, the ingredients are prepared in the following amounts relative to the total number of ingredients constituting the gel sheet for cosmetic facial mask:

Oil agent: preferably 2 to 10% by mass

Nonionic surfactant with an HLB value of 6 or less: preferably 0.50 to 5.0 mass%

Nonionic surfactant with an HLB value of 10 or more: preferably 0.50 to 5.0 mass%

Polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt thereof: preferably 0.50 to 35% by mass

Tackifier: preferably 0.050 to 3.0% by mass

Wetting agent: preferably 1.0 to 50% by mass

Exudation agent: preferably 0.10 to 20 mass%, more preferably 1.0 to 12 mass%, more preferably 1 to 10 mass%

Cross-linking agent: preferably 0.10 to 5.0 mass%, more preferably 0.50 to 2.0 mass%

pH adjuster: preferably 0.10 to 10% by mass

Water: preferably 45 to 97% by mass, more preferably 50 to 95% by mass

The hydrogel is made by pouring a gel composition in which the ingredients constituting the gel sheet for a cosmetic facial mask are mixed into a container of a desired shape such as a bottomed container with a substantially rectangular cross section, and cross-linking and/or After hardening, it can be formed into a desired shape such as a sheet. The shape of the hydrogel sheet can be formed into any shape according to the purpose. Examples thereof include substantially rectangular shape, substantially circular shape, etc., but are not limited thereto.

When the gel sheet for cosmetic facial mask has an intermediate base material, the manufacturing process of the gel sheet for cosmetic facial mask can change conditions according to the composition of the hydrogel, the material and thickness of the intermediate base material, etc., and is not particularly limited. For example, the intermediate base material is held in the air while a certain tension is applied to the intermediate base material, and then the gel composition mixed with each component is allowed to flow onto the upper and lower sides of the intermediate base material. A method of cross-linking and/or hardening to form a sheet; after preparing two gel sheets with smooth surfaces, these gel sheets are sandwiched between the gel sheets and held under a certain tension. The method of compounding the base material; or making a gel sheet with a smooth surface, placing the intermediate base material on top of the gel sheet while applying a certain tension, and then mixing the various components. The gel composition flows on top of the intermediate base material and is cross-linked and/or hardened.

According to this configuration, the oil agent can be more effectively dispersed, the emulsion can be stabilized, and the average diameter of the oil agent on the surface of the gel sheet for cosmetic facial mask can be controlled to be 5 μm or less, and the oil agent on the surface of the gel sheet can be produced. Gel sheets for cosmetic facial masks with an average diameter of oil droplets less than 5 μm.

[Example]

Examples and comparative examples of the present invention will be described below, but the present invention is not limited thereto.

1. Manufacturing of Gel Tablets

(Example 1)

With the composition (mass %) shown in Table 1, add water containing a nonionic surfactant with an HLB value of 10 or more to the oil containing a nonionic surfactant with an HLB value of 6 or less, and use The homogenizer was stirred at 9,000 rpm for 5 minutes to prepare an emulsion. A tackifier and a wetting agent are added to a polymer of a polymerizable unsaturated monomer having an anionic functional group or a salt thereof, and then an exuding agent is added and the mixture is thoroughly kneaded until it becomes uniform. The emulsion, cross-linking agent, preservative, and water are added to this mixture and dispersed sufficiently to form a slurry. A pH adjuster is added to this slurry so that the total amount is 100 parts by mass, and then the mixture is thoroughly kneaded and stirred.

Next, as an intermediate base material, a nylon braid (Tricote) with a unit area weight of 17 g/ ^m was sandwiched between a 38 μm thick PET film (polyethylene terephthalate film) and a 100 μm thick PET film. Half braid), and immediately after the mixing is completed, an appropriate amount of the above composition is poured into the central part so that the overall thickness becomes 1 mm to form a sheet. The gel sheet was left in this state for 24 hours to obtain a gel sheet with a thickness of 1 mm. This gel sheet was cut into the shape of the face to become a sample for evaluation.

(Examples 2 to 10)

As shown in Tables 1 to 3, each gel sheet sample of Examples 2 to 10 was produced by the same method as Example 1, except that the composition used to form the gel sheet was changed.

(Comparative example 1)

Different from Examples 1 to 10, no emulsion is produced, and a tackifier, a wetting agent, a surfactant, and an oil agent are added to the polymer of a polymerizable unsaturated monomer having an anionic functional group or its salt, Then add the exuding agent and water and mix thoroughly until uniform. Add cross-linking agent, preservative, water The mixture is thoroughly dispersed to form a slurry. A pH adjuster is added to this slurry so that the total amount is 100 parts by mass, and then the mixture is thoroughly kneaded and stirred.

Thereafter, a gel sheet sample was produced in the same manner as in Example 1.

(Comparative Examples 2 to 3)

As shown in Table 1, each gel sheet sample of Comparative Examples 2 to 3 was produced by the same method as Comparative Example 1, except that the composition used to form the gel sheet was changed.

(Comparative Examples 4 to 11)

As shown in Tables 2 to 3, each gel sheet sample of Comparative Examples 4 to 11 was produced by the same method as Example 1, except that the composition used to form the gel sheet was changed.

[Table 1]

[Table 2]

[table 3]

2.Measurement methods and evaluation criteria

(1)Measurement method of HLB value

The HLB value is calculated by the Atlas method of equation (1) shown below. In addition, the saponification value and the neutralization value in the formula (1) can be obtained by the method published in the 2003 edition of the Standard Oil and Fat Analysis Test Method compiled by the Japan Petroleum Chemistry Society (established by the Japan Petroleum Chemistry Society).

HLB=20(1-S/A)． ． ． (1)

S is the saponification value of the ester, and A is the neutralization value of the fatty acid.

The saponification value is the number of mg of potassium hydroxide consumed when hydrolyzing 1g of the fatty acid ester of the polyol with potassium hydroxide. The neutralization value is the amount of mg of potassium hydroxide required to neutralize 1g of the fatty acid constituting the fatty acid ester of the polyol. mg of potassium hydroxide.

(2)Measurement method of the average diameter of oil droplets on the gel surface

The average diameter of the oil droplets is the average diameter of 100 oil droplets observed in the image observation mode using the "Shape Analysis Laser Microscope VK-X1000" manufactured by Keyence Corporation with a 20x objective lens or a 50x objective lens. value to specify.

(3) Stability of emulsion

The emulsions prepared in each of the Examples and Comparative Examples were left to stand for 24 hours and visually observed. If the oil of the emulsion does not separate after standing, it is PASS; if the oil of the emulsion separates after standing, it is FAIL.

(4) Stability of slurry

The slurry prepared in each of the Examples and Comparative Examples was left to stand for 24 hours and visually observed. If the oil in the slurry does not separate, it is PASS, and if the oil in the slurry separates, it is FAIL.

(5) Sense of continuity

A gel mask cut into the shape of the face was attached to the faces of 10 female subjects for 20 minutes, and then the gel mask was peeled off, and the condition of the skin 2 hours after peeling off was evaluated to determine whether the moisturizing was sustained. Points are evaluated in the following ways.

A: The skin is moisturized very continuously.

B: Moisturizing of the skin lasts.

C: The skin's moisturizing is not sustained.

D: Moisturizing of the skin is not sustained.

3.Results

The surfactants used in the production of the gel sheet samples of the Examples and Comparative Examples and their HLB values are shown in Table 4.

[Table 4]

In the sample of Example 1, both the emulsion and the slurry were stable, and the average diameter of the oil droplets on the gel surface was 3.8 μm. The skin's hydration lasts very long.

In the sample of Example 2, 1,3-BG and DPG were used as wetting agents and the type and ratio of the wetting agents were changed. However, the emulsion and slurry still had stability, and the average oil droplets on the gel surface were With a diameter of 2.1μm, the skin's hydration is very sustained.

In the sample of Example 3, the oil agent is jojoba oil, the emulsion and slurry are stable, the average diameter of the oil droplets on the gel surface is 4.2 μm, and the skin is continuously moisturized.

In the samples of Examples 4 to 7, even if the surfactant with a changed HLB value is used or the type and combination of oil agents are changed, the emulsion and slurry are still stable. The average diameter of the oil droplets on the gel surface is Below 5μm, the skin's moisturizing is very sustained.

In the samples of Examples 8 to 10, even if the types of nonionic surfactants with an HLB value of 6 or less and nonionic surfactants with an HLB value of 10 or more are used, the emulsions and slurries are still stable. The average diameter of the oil droplets on the gel surface is less than 5 μm, and the skin's moisturizing is very sustained.

In the sample of Comparative Example 1, the stability of the slurry was poor and the oil separated. The average diameter of the oil droplets on the gel surface is greater than 5 μm, and the moisturizing is not sustained.

In the samples of Comparative Examples 2 and 3, 1,3-BG and DPG were used as wetting agents and the types and ratios of the wetting agents were changed. However, the polymerization properties of the anionic functional groups were changed without making an emulsion. When the polymer of unsaturated monomer or its salt, tackifier, wetting agent, surfactant, and oil are kneaded at once, the stability of the slurry will be poor and the oil will separate. The average diameter of the oil droplets on the gel surface is greater than 5 μm, and the moisturizing is not sustained.

In the samples of Comparative Examples 4 to 6, even if an emulsion is prepared, when there is only one type of nonionic surfactant, the stability of the emulsion and slurry is poor, and the oil agent is separated. The average diameter of the oil droplets on the gel surface is greater than 5 μm, and the moisturizing is not sustained.

In Comparative Example 7, when using a nonionic surfactant with an HLB value of greater than 6 and less than 10 and a nonionic surfactant with an HLB value of 6 or less, the stability of the emulsion and slurry was poor, and oil was produced. separation. The average diameter of the oil droplets on the gel surface is greater than 5 μm, and the moisturizing is not sustained.

In Comparative Example 8, when using a nonionic surfactant with an HLB value of greater than 6 and less than 10 and a nonionic surfactant with an HLB value of 10 or more, the stability of the emulsion and slurry was poor, and oil was produced. separation. The average diameter of the oil droplets on the gel surface is greater than 5 μm, and the moisturizing is not sustained.

In Comparative Examples 9 to 11, when only two types of nonionic surfactants with HLB values of 10 or above are used, or only two types of nonionic surfactants with HLB values of 6 or below are used, the stability of emulsions and slurries Poor performance, oil separation occurs. The average diameter of the oil droplets on the gel surface is greater than 5 μm, and the moisturizing is not sustained. Furthermore, since the compositions of Comparative Examples 10 and 11 do not contain an exuding agent, the solution containing the oil agent cannot effectively exude to the gel surface, and the oil agent is not easily supplied to the skin, and the moisturizing is not sustained.

Furthermore, regarding the two types of nonionic surfactants used in the production of each gel sheet of Examples 1, 4, 7 to 10 and Comparative Examples 7 to 11, the nonionic surfactant with a lower HLB value When the HLB value of the nonionic surfactant with a higher HLB value is taken as the vertical axis and the HLB value of the nonionic surfactant with a higher HLB value is taken as the horizontal axis, the intersection is plotted, as shown in Figure 5, when the two nonionic surfactants are located surrounded by four corners When the HLB value of one nonionic surfactant is below 6, and the HLB value of another nonionic surfactant is above 10, it indicates that the emulsifier is stable.

Claims (9)

A gel sheet for cosmetic facial mask, which contains: a synthetic polymer with a mesh structure, an oil agent, an exuding agent, a wetting agent, and water, wherein the average diameter of the oil agent on the surface of the gel sheet is 5 μm or less. The gel sheet for a cosmetic facial mask according to claim 1, wherein the oil agent contains one or more types selected from the group consisting of hydrocarbons, waxes, and oils and fats. The gel sheet for cosmetic facial mask according to claim 1, wherein the gel sheet for cosmetic facial mask contains 0.1 to 20 mass % of the aforementioned exuding agent. The gel sheet for cosmetic facial mask according to claim 1, wherein the exuding agent contains a nonionic water-soluble polymer. The gel sheet for cosmetic facial mask according to any one of claims 1 to 4, wherein the synthetic polymer having a network structure is a polymer of a polymerizable unsaturated monomer having an anionic functional group or such polymerization The salt of the substance and the cross-linked product with the cross-linking agent. The gel sheet for cosmetic facial mask according to any one of claims 1 to 5, further contains a nonionic surfactant with an HLB value (Hydrophile-Lipophile Balance) of 6 or less, and a nonionic surfactant with an HLB value of 10 or more. Surfactants. The gel sheet for cosmetic facial mask according to claim 6, wherein both the nonionic surfactant with an HLB value of 6 or less and the nonionic surfactant with an HLB value of 10 or more are polyglycerol fatty acid esters. . The gel sheet for cosmetic facial mask according to claim 6, which contains 0.5% by mass or more of the nonionic surfactant with an HLB value of 6 or less, and 0.5% by mass or more of the nonionic interface with an HLB value of 10 or more. active agent. A method for manufacturing a gel sheet for cosmetic facial mask according to any one of claims 1 to 8, including the following steps: The step of mixing an oil agent with a nonionic surfactant added with an HLB value of 6 or less and water with a nonionic surfactant added with an HLB value of 10 or more to prepare an emulsion; and Mix a polymer of a polymerizable unsaturated monomer with anionic functional groups or a salt of such a polymer, an exuding agent, a wetting agent, a cross-linking agent, water, and the aforementioned emulsion to form a gel with a network structure. The steps of forming a composition.