JP7166014B2 - Cosmetic gel sheet and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a novel cosmetic using a water-soluble polymer gel and a method for producing the same.

A cosmetic gel sheet is a material for skin care, and when applied to the skin, it provides a moisturizing effect as well as a cooling and warming sensation. The gel sheet does not flow like lotion or milky lotion, and has a long-lasting effect on the skin.

Conventional cosmetic gel sheets are made by dissolving a hydrophilic resin in water to form a gel, and have been used with water, moisturizing agents, electrolytes, etc. held therein. A conventional gel sheet contains a large amount of water, and it was essential to crosslink the hydrophilic resin with a crosslinking agent.
It contains a sheet-like pack agent (Patent Document 1) composed of polysaccharides such as collagen, chitin, chitosan, alginic acid, cellulose, etc., polyacrylic acid, polyhydric alcohol, water, and an external cross-linking agent as essential components, and further There is known a gel sheet for skin care cosmetics, which contains a keratin softening agent, a cell activating component, and the like, if necessary (Patent Document 2).

A polysaccharide gel sheet containing red algal polysaccharides (agar, agarose, etc.) and fermented polysaccharides (glucomannan, galactomannan, etc.) has also been reported (Patent Document 3). A gel sheet composed of a hydrophilic polymer having an ionic group and water has also been reported (Patent Document 4). Examples of hydrophilic polymers having ionic groups include polyvinyl alcohol derivatives, (meth)acrylate copolymers, cellulose derivatives, and polysaccharide derivatives (xanthan gum, guar gum, etc.).
A two-component sheet-like pack cosmetic, in which a water-insoluble gel sheet made of amylose is impregnated with a beauty essence, has also been reported (Patent Document 5).

Natural polymers with hydrophilic groups, such as neutral polysaccharides (cellulose, amylose, amylopectin, dextran, pullulan, inulin, galactan, mannan, xylan, arabinan, glucomannan, galactomannan, hydroxyethylcellulose, methylcellulose, etc.), anionic Polysaccharides (pectic acid, alginic acid, agarose, agar, carrageenan, fucoidan, hyaluronic acid, chondroitin sulfate, heparin, gellan gum, native gellan gum, xanthan gum, carboxymethyl cellulose, etc.), cationic polysaccharides (chitin, chitosan, cationized cellulose) etc.), and biomedical adhesive gel sheets using proteins (gelatin, casein, elastin, etc.) have also been reported (Patent Document 6).
Gel sheets containing collagen, gelling agents, and polyhydric alcohol compounds have also been reported as gel sheets containing polysaccharides (Patent Documents 7 to 9).

It has also been pointed out that it is preferable to mix a polysaccharide with a gel sheet (Patent Documents 10 and 11). Preferred polysaccharides include neutral polysaccharides such as cellulose, amylose, amylopectin, dextran, pullulan, inulin, galactan, mannan, xylan, arabinan, glucomannan, galactomannan, agarose, methylcellulose, hydroxypropylcellulose, curdlan, xyloglucan, etc.), anionic polysaccharides (pectic acid, alginic acid, agarose, agar, carrageenan, fucoidan, hyaluronic acid, chondroitin sulfate, heparin, gellan gum, native gellan gum, xanthan gum, carboxymethyl cellulose, carboxymethyl starch, carbo silylmethyl dextran, etc.), cationic polysaccharides (chitin, chitosan, cationized cellulose, cationized starch, cationized dextran, etc.). As anionic polysaccharides, those having carboxyl groups, sulfo groups and phospho groups are shown.
However, these conventional gel sheets are characterized by containing a large amount of water.

JP-A-3-081213 JP-A-11-228340 Japanese translation of PCT publication No. 2003-518008 JP-A-2005-145895 JP-A-2005-213176 Japanese Patent Application Laid-Open No. 2008-137970 JP 2009-091342 A JP 2009-108005 A Japanese Patent Application Laid-Open No. 2009-108006 JP 2009-108007 A Japanese Patent Application Laid-Open No. 2009-108008

The gel sheets that have been published so far contain a large amount of water, and even if the sheets are applied to the skin, they tend to slip off unless the person is gently lying face up. In winter, it is cold and uncomfortable. SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the conventional problems and furthermore to provide a cosmetic gel sheet that can give a pleasant sensation of warmth when applied.

The cosmetic gel sheet according to the present invention, which has been made to solve the above problems, is characterized by comprising a carboxy group-containing water-soluble polymer, a polyhydric alcohol and an acid as essential constituents, and having a water content of 30% by weight or less. do.
Here, the carboxy group-containing water-soluble polymer refers to a water-soluble polymer having a carboxy group as a substituent in the molecule.

More preferably, the water content in the cosmetic gel sheet is 15% by weight or less.
The cosmetic gel sheet of the present invention is characterized in that the water content in the sheet is extremely low compared to conventional cosmetic sheets, and the water content may be substantially zero.

If the water content in the present cosmetic gel sheet is 30% by weight or more, the gelation of the water-soluble polymer is insufficient, so that the gel sheet lacks mechanical strength and is unsuitable as a cosmetic sheet. That is, the cosmetic gel sheet of the present invention is characterized by the fact that it does not require water in the product, although it is convenient to use water in the raw material preparation stage. It is preferable to evaporate and evaporate water during the manufacturing process to reduce the water content in the cosmetic gel sheet.
A small amount of water in the gel sheet poses no physical problem, but the energy cost for evaporating the water becomes high. Therefore, practically, the amount of water that does not impair the properties of the cosmetic gel sheet may be left.

The carboxyl-containing water-soluble polymer includes synthetic carboxyl-containing polymers such as polyacrylic acid and its copolymers, and carboxyl-containing polysaccharides, the latter being more preferred in the present invention. The reason is that the carboxy group-containing water-soluble polymer, which is a synthetic polymer, is concerned about residual monomers having an unpleasant odor.
Since the present cosmetic gel sheet can be handled by itself, it does not require a support. However, it does not matter if a support is attached.

When an aqueous solution containing a carboxyl group-containing water-soluble polymer, an acid and a polyhydric alcohol is prepared and the water is evaporated to lower the pH, the water-soluble polymer undergoes pseudo-crosslinking due to the association of the carboxyl groups and is easily gelled. do. The cosmetic gel sheet of the present invention utilizes this property of the carboxy group-containing water-soluble polymer.

The present cosmetic gel sheet does not need to contain water-soluble divalent ions. In the case of a conventional hydrogel sheet containing a large amount of water (70% by weight or more of the gel sheet), it is necessary to crosslink with water-soluble divalent metal ions in order to gel the carboxy group-containing water-soluble polymer (Patent Document 1, 2). The present invention does not require a metal salt because it reduces the amount of water in the gel and utilizes association between carboxy groups.
In addition, even if the gel sheet containing a large amount of water and associated with divalent metal ions is applied to the skin and then massaged with water, the carboxyl group-containing polysaccharide does not dissolve in water. The mechanism of gel association is clearly different between the conventional hydrogel sheet and the cosmetic gel sheet of the present invention.

Preferred contents of each component in the present cosmetic gel sheet are as follows.
The polyhydric alcohol is preferably 10 parts by weight or more and 1000 parts by weight or less per 1 part by weight of the water-soluble polymer.
The amount of acid used is such that the pH of the raw material aqueous solution is such that the association of the carboxy group-containing water-soluble polymer is appropriate. For example, when 120 parts by weight of water is used per 1 part by weight of the carboxy group-containing water-soluble polymer, the amount of acid is preferably the amount required to adjust the pH of the aqueous solution to 4.5 to 2.0. If the amount of water is less than this, the pH can be lowered according to the amount, and if the amount of water is large, the pH can be increased according to the amount. In the case of the exemplified amount of water, if the pH is 4.5 or higher, a gel with sufficient strength cannot be obtained even if the water is dried. Also, if the pH is 2.0 or less, the raw material aqueous solution tends to gel before the water is dried, and even if it is dried to form a gel sheet, it is not preferable because the gel sheet feels irritating when applied to the face.

Carboxy group-containing water-soluble polymers become gel-like under acidic conditions due to the association of carboxy groups, but when the pH approaches neutrality, the gel structure is destroyed and the polymers become water-soluble. That is, it reversibly assumes a gel state and a soluble state as the pH changes. Therefore, by applying an appropriate amount of water to the skin and massaging it in a gel state, the polysaccharide gel is solubilized and the polysaccharide and the compounded valuable ingredients can be effectively absorbed into the skin.
At an acid concentration at which the pH of the aqueous solution is 2.0 or less, the gel structure is strong, and even if an appropriate amount of water is added and massaged, it is difficult to achieve a soluble state. Here, the term "appropriate amount" refers to an amount that does not run off the face when the cosmetic gel sheet is applied to the face and water is added. It makes no practical sense to add more water than the face can hold.

Polyhydric alcohols have the property of generating heat when they come into contact with water. Polyhydric alcohol, which is the largest component of this gel sheet, generates heat when the gel sheet is applied to the skin and water is added, giving the skin a comfortable warmth. A conventional gel sheet contains a large amount of water and does not generate significant heat, but the gel sheet of the present invention, which has a low water content, produces a feeling of warmth.

As the carboxy group-containing polysaccharides, xanthan gum, gellan gum, alginic acid, carboxymethyl cellulose, hyaluronic acid and the like having carboxy groups are preferably used. They may be metal salts such as sodium or potassium salts.

The molecular weight of the carboxy group-containing water-soluble polymer is preferably in the range of about 5×10 ⁴ to 5×10 ⁶ daltons. As long as the molecular weight is within this range, different water-soluble polymers may be mixed, or the same water-soluble polymers with different molecular weights may be mixed and used. In addition, one having a molecular weight within this range and another having a molecular weight smaller than this range can be mixed and used.

The amount of the carboxy group-containing water-soluble polymer is preferably in the range of 0.1% by weight to 10% by weight of the entire gel. If the amount of the carboxy group-containing water-soluble polymer is less than 0.1% by weight, the gel becomes soft and cannot form an excellent elastic gel. On the other hand, if it exceeds 10% by weight, it becomes hard and cannot form an excellent elastic gel, resulting in poor adhesion to the skin.

Acids used in the present invention include monobasic acids such as hydrochloric acid, acetic acid and lactic acid, and polybasic acids such as citric acid, oxalic acid and tartaric acid. Citric acid, tartaric acid, and lactic acid are particularly preferred. Also, two or more kinds of acids can be mixed and used.

The polyhydric alcohol used in the present invention is not particularly limited, and glycerin, propylene glycol, ethylene glycol, polyethylene glycol, 1,3-butylene glycol, dipropylene glycol, sorbitol and the like can be used. Among these, glycerin is particularly preferred.
The amount of the polyhydric alcohol is preferably 10 to 1000 parts by weight or more, more preferably 30 to 500 parts by weight, per 1 part by weight of the carboxy group-containing water-soluble polymer. If the amount of polyhydric alcohol is less than 10% by weight, the resulting gel will be hard rather than an elastic gel with adequate skin adhesion. On the other hand, if it exceeds 1000 weight, the gel becomes soft or gel formation becomes impossible.

In the carboxyl group-containing polysaccharide gel, water, which is the largest component in the initially blended raw materials, volatilizes during the drying process, and the polyhydric alcohol becomes the largest component.

The gel sheet of the present invention is gelled by association of carboxy group-containing polymers and has mechanical strength. In addition, the gel structure collapses and dissolves when the pH is raised. Such a gel sheet has been put to practical use for the first time by the present invention. When the strength of the gel sheet according to the present invention was measured using a tensile tester, the breaking stress was 0.05 N/cm ² or more. If the breaking stress is less than 0.05 N/cm ² , it becomes difficult to maintain the structure of the gel sheet itself, making it difficult to form the sheet.

Valuable ingredients such as cosmetics and pharmaceutical ingredients can be blended into the cosmetic gel sheet as long as they do not affect the objects and effects of the present invention. It is especially advantageous for application as cosmetics and quasi-drugs. Examples of ingredients that can be added include whitening ingredients, anti-wrinkle ingredients, anti-inflammatory ingredients, blood circulation promoting ingredients, antibacterial ingredients, anti-pruritic ingredients, various vitamins and their derivatives, antioxidant pigments, fragrances, and the like.
Cosmetics and pharmaceutical ingredients to be blended may be added to the raw material aqueous solution.

Whitening ingredients include, but are not limited to, magnesium ascorbic acid phosphate, ascorbic acid glucoside and its salts and acylated derivatives, ethyl ascorbic acid, vitamin C derivatives such as ascorbyl palmitate, α-arbutin, β- Arbutin, kojic acid, placenta extract, cysteine, glutathione, ellagic acid, rucinol, tranexamic acid, baicalein, adenosine and its sodium phosphate salt, astaxanthin, deer horn mushroom, oil-soluble licorice, lavender, lupuyan, burnet, resveratrol, Ganoderma lucidum and their extracts, tinctures or components contained therein, and the like.

Examples of anti-wrinkle ingredients include, but are not limited to, retinol, retinoic acid, retinol acetate, retinol palmitate and other retinoids, citric acid, fruit acids, glycolic acid, α-hydroxy acids such as lactic acid, and α-hydroxy acid cholesterol. , rutin sugar derivatives, N-methylserine, elastin, collagen, sericin, centella asiatica extract, golden extract, and the like.

Examples of anti-inflammatory components include, but are not limited to, glycyrrhetinic acid, 2K glycyrrhetinic acid, allantoin, epsilon-aminocaproic acid, azulene, shikonin, tranexamic acid and coptis, licorice, terminalaria, millefolium, licorice, fin prickly, aloe, butcher bloom, horse chestnut, peach leaf, loquat leaf and their extracts, tinctures or ingredients contained therein.

Examples of the blood circulation-promoting component include, but are not limited to, vitamin E, nicotinic acid, nicotinamide, benzyl nicotinate, nicomole, caffeine, capsaicin, nonanoic acid vanillylamide, gingerol, gingerol, and the like.

Examples of antibacterial components include, but are not limited to, cationic surfactants such as isopropylmethylphenol, triclosan, triclocarban, trichlorohydroxyphenol, halocarban, benzalkonium chloride, and benzethonium chloride, photosensitizers, zinc oxide, and titanium oxide. , chitin, chitosan, hinokitiol and anise.

Examples of antipruritic ingredients include, but are not limited to, diphenhydramine hydrochloride, chlorpheniramine maleate, crotamiton, glycyrrhizic acids, menthol, camphor, rosemary oil, capsaicin, nonanoic acid vanillylamide, and dibucaine.

_{Vitamins are} not particularly limited. calciferol), vitamin D ₃ (cholecalciferol), vitamin derivatives, vitamin E (tocopherol), dl-α-tocopherol acetate, dl-α-tocopherol, tocopherol butyrate, tocopherol nicotinate, benzyl nicotinate, natural vitamin E , vitamin K, vitamin U and the like. In addition, as water-soluble vitamins, vitamin B ₁ (thiamine), vitamin B ₂ (riboflavin butyrate), vitamin B ₆ (fatty acid esters such as pyridoxine dicaprylate and pyridoxine dipalmitate), vitamin B ₁₂ (cobalamin), vitamin B ₁₃ , vitamin B14, vitamin B15 ₍ pangamic acid), folic acid, carnitine, thioctic acid, pantothenyl alcohol, pantothenyl ethyl ether, pantothenic acid, nicotinic acid, nicotinamide, choline, inositol, vitamin C ₍ ascorbic acid) , ascorbyl stearate, ascorbyl pantothenate, ascorbyl dipalmitate, vitamin H (biotin), vitamin P (hesperidin), aplecia, and the like.

Examples of antioxidant components include, but are not limited to, polyphenols such as anthocyanins, catechins, green tea polyphenols and apple polyphenols, carotenoids such as ascorbic acid, sodium ascorbate, sodium ascorbate sulfate, β-carotene and astaxanthin, and tocopherols. , tocopherol acetate, natural vitamin E, tocomonoenol, tocotrienol, β-diketones such as curcumin, lignans such as sesamin and sesamolin, phenols such as eugenol, and the like.
Examples of anti-allergic ingredients include, but are not limited to, glycyrrhetinic acid, glycyrrhetinic acid derivatives such as 2K glycyrrhizic acid, licorice, chlorella, comfrey, botanpi, fuyubodaiju, trichophyton, sage, perilla, mugwort, and extracts thereof. Examples include tinctures and ingredients contained therein.

The cosmetic gel sheet of the present invention can be produced by uniformly dissolving a carboxyl group-containing water-soluble polymer, an acid and a polyhydric alcohol in water, and appropriately drying and evaporating the water to obtain the desired form. can.
Specifically, an aqueous solution containing a carboxyl group-containing water-soluble polymer, a polyhydric alcohol, and an acid is mixed with a propeller-type rotary stirrer for preparation. By coating the prepared aqueous solution on a polyethylene terephthalate film so as to have a uniform thickness and drying with hot air, a transparent gel sheet with a uniform thickness can be produced. A gel sheet is cut into a circular shape, an elliptical shape, a magatama shape, or a face shape, and this is used as a sheet-like cosmetic product.

Alternatively, the prepared aqueous solution may be poured into a tray and dried to evaporate the water. If the tray is shaped like a magatama or face, cutting of the sheet is not required.
The material of the tray is preferably a material impermeable to oxygen and water vapor or a composite of such materials, preferably made of plastic and provided with a frame. Plastic trays can be made by thermoforming or thin wall injection molding. The frame is made from a thermoplastic such as polypropylene or polyethylene terephthalate, or a composite of thermoplastics such as polyethylene terephthalate/aluminum/polyethylene.

When this cosmetic gel sheet is applied to the face, the polyhydric alcohol absorbs water vapor or moisture on the surface of the face, generates heat, and gives a warm feeling to the face.
After the cosmetic gel sheet is applied to the face, an appropriate amount of water is applied and massaged, and the gel sheet gradually dissolves while giving a warm feeling to the face. This is because the gel dissolves due to an increase in water content and an increase in pH value.

The cosmetic gel sheet of the present invention does not contain water as an essential component, but contains a gelled water-soluble polymer containing a carboxyl group in a polyhydric alcohol. Such a cosmetic gel sheet has the following characteristics.
(1) Since it contains only a small amount of water, it is not suitable for the growth of microorganisms and does not require preservatives.
(2) The main component is a polyhydric alcohol, and when the gel sheet is applied to the skin and massaged with water (hot water), the alcohol heats up due to hydration, giving the skin a pleasant sensation.
(3) Increased stability of water-unstable cosmetic valuable ingredients.

The cosmetic gel sheet of the present invention utilizes the inherent excellent features of water-soluble polymers and polysaccharides. Carboxy group-containing water-soluble polymer gel that does not undergo chemical cross-linking generates a warm feeling due to the hydration of polyhydric alcohol when a small amount of water is added after application to the skin, and when massaged, the gel dissolves and the ingredients penetrate the skin. . The effect persists even after washing off with water, giving the skin a feeling of warmth, moisture and smoothness. Therefore, it is useful as a material used in the beauty field. Conventional hydrogel sheets do not show such an effect.

Table of composition and pH of raw material aqueous solution for producing cosmetic gel sheet. Table of properties and test results of cosmetic gel sheets.

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the examples.

(Production of polysaccharide gel sheet)
An aqueous solution of a carboxyl group-containing water-soluble polymer, a polyhydric alcohol and an acid was stirred and mixed with a propeller-type rotary stirrer according to the compounding ratio (parts by weight) shown in Table 1 to prepare a raw material aqueous solution. Tocopherol and apressier were dissolved in a small amount of ethanol and added. The prepared raw material aqueous solution is coated on a 25 μm polyethylene terephthalate film to a uniform thickness and dried in a gear oven at 60 to 80° C. for 5 to 30 minutes to form a cosmetic gel sheet with a thickness of about 200 μm or not gelled. A viscous product was obtained. The water content in the gel was adjusted by changing the drying temperature and drying time.
The rightmost column of Table 1 shows the measured pH of the raw material aqueous solution.

The specifications and sources of each raw material are as follows. Polyacrylic acid is Aronbis AH-106X (Toagosei Co., Ltd.), and hyaluronic acid (H80) of Examples 5 and 9 has a molecular weight of about 800,000 (Kikkoman Biochemifa Co., Ltd. FCH-80), Example 13 , 14 and 15 used hyaluronic acid (H200) having a molecular weight of about 2,000,000 (FCH-200 manufactured by Kikkoman Biochemifa Co., Ltd.). Other raw materials include glycerin (concentrated glycerin, Miyoshi Oil & Fat Co., Ltd.), citric acid (Nacalai Techs Co., Ltd.), trisodium ascorbyl palmitate phosphate (Apressie, Showa Denko Co., Ltd.), tocophenol (Nacalai Techs Co., Ltd.). Co., Ltd.), xanthan gum (Sansho Co., Ltd.), gellan gum (Wako Pure Chemical Industries, Ltd.), CMC1260 (Dai Cellufinechem) as carboxymethyl cellulose, and alginic acid (Kikkoman Biochemifa Co., Ltd.). Lactic acid, ethylene glycol, hydrochloric acid, and acetic acid were special grade reagents (Nacalai Tesque, Inc.).
The amounts of hydrochloric acid and acetic acid are parts by weight converted from aqueous solution reagents.

(Properties comparison of manufactured polysaccharide gel sheets)
Table 2 summarizes the evaluation results of the polysaccharide gel sheets of Examples 1-12 and Comparative Examples 1-5.
1. Observation Results of Properties Observation results regarding flexibility, elasticity, and tensile strength by the naked eye and touch are shown.
2. Results of measurement of water content The results of measurement of the water content in the gel are shown. The water content was measured by heating the sample at 90°C for 1 hour and calculating the weight loss before and after heating.
3. Results of Skin Adhesion Test Shown are the results of skin adhesion when a polysaccharide gel sheet (2 cm×2 cm) was applied to the inside of the forearm of a human volunteer.
4. Warm Sensation Test Results Shown are the results of warm sensation to the skin when a polysaccharide gel sheet (2 cm×2 cm) was applied to the inside of the forearm of a human volunteer.
5. Solubility test A polysaccharide gel sheet (2 cm x 2 cm) was applied to the forearm of a human volunteer, 1 ml of water was dropped, and the sheet was massaged for 3 minutes to observe the solubility of the gel.
6. Mechanical Strength Test A dumbbell shape with a width of 1.5 cm was punched out of the polysaccharide gel sheet, and a tensile test was conducted at a pulling speed of 1 cm/min while supporting both ends to measure breaking strength. The numerical unit is N/cm ² . A compact desktop tester EZ Test EZ-SX manufactured by Shimadzu Corporation was used.

In Table 2, A indicates sufficient flexibility, elasticity and tensile strength, B indicates insufficient flexibility and elasticity, C indicates sufficient flexibility and elasticity, and D indicates liquid.
In the skin adhesion test in Table 2, A indicates good adhesion, B indicates partial floating and adhesion, and C indicates no adhesion and peeling. Those with properties C or D could not form a practical sheet and could not be tested.
In the warmth test in Table 2, A indicates that a high sensation of warmth was felt on the skin, B indicates that a sensation of warmth was felt, and C indicates that there was no sensation of warmth. Those that did not form a sheet failed this test.
In the solubility test in Table 2, A means completely dissolved and B means partially dissolved. Those that did not form a sheet failed this test.

(Face mask: Example 16)
1 part by weight of alginic acid, 80 parts by weight of glycerin, 0.5 part by weight of tartaric acid, 0.05 part by weight of tocopherol and 0.05 part by weight of vitamin C derivative were added to 120 parts by weight of water and mixed well to form a uniform solution. . This solution was poured into a polypropylene thermoformed human face tray to a depth of 3 mm from the bottom of the tray. After injection, the gel sheet was formed by hot air drying at 75° C. for 2 hours to evaporate water. The gel sheet was removed from the mold, cut into a face sheet, and evaluated on the face. Adhesion to skin, exothermicity, and water solubility were all good.

Claims (3)

One or more carboxy group-containing water-soluble polymers selected from the group consisting of xanthan gum, gellan gum, alginic acid, carboxymethylcellulose, hyaluronic acid, polyacrylic acid and metal salts thereof , and having a molecular weight of about 5×10 ⁴ to in the range of 5×10 ⁶ Daltons ,
one or more polyhydric alcohols selected from the group consisting of glycerin, propylene glycol, ethylene glycol, polyethylene glycol, 1,3-butylene glycol, dipropylene glycol and sorbitol;
One or more acids selected from the group consisting of citric acid, tartaric acid, lactic acid and hydrochloric acid, and whitening ingredients, anti-wrinkle ingredients, anti-inflammatory ingredients, blood circulation promoting ingredients, antibacterial ingredients, antipruritic ingredients, various vitamins and their derivatives, anti A method for producing a cosmetic gel sheet comprising one or more cosmetic ingredients selected from the group consisting of oxidizing ingredients and perfumes and having a water content of 15% by weight or less, comprising the following steps:
A step of preparing a raw material aqueous solution containing the carboxy group-containing water-soluble polymer, polyhydric alcohol, acid and cosmetic ingredients, wherein the amount of the polyhydric alcohol is 10 parts by weight based on 1 part by weight of the carboxy group-containing water-soluble polymer. 1000 parts by weight, the content of the acid in the aqueous raw material solution is an amount suitable for making the pH of the aqueous raw material solution 2.0 to 4.5, and the aqueous raw material solution is applied on a film or A step of pouring into a tray and drying to a water content of 15% by weight or less to prepare a gel sheet , wherein the amount of the carboxy group-containing water-soluble polymer is 0.1% to 10% by weight of the entire gel sheet % range,
A method for producing a cosmetic gel sheet, comprising: One or more carboxy group-containing water-soluble polymers selected from the group consisting of xanthan gum, gellan gum, alginic acid, carboxymethylcellulose, polyacrylic acid and metal salts thereof , and having a molecular weight of about 5×10 ⁴ to 5×10 in the range of ⁶ daltons ,
One or more polyhydric alcohols selected from the group consisting of glycerin, propylene glycol, ethylene glycol, polyethylene glycol, 1,3-butylene glycol, dipropylene glycol and sorbitol, and the group consisting of citric acid, tartaric acid, lactic acid and hydrochloric acid with one or more selected acids as essential constituents,
A method for producing a cosmetic gel sheet having a water content of 15% by weight or less, wherein the gel sheet is completely dissolved under conditions in which 1 ml of water is dropped onto the gel sheet of 2 cm x 2 cm and the gel sheet is massaged for 3 minutes. , the following steps:
A step of preparing a raw material aqueous solution containing the carboxy group-containing water-soluble polymer, a polyhydric alcohol and an acid, wherein the amount of the polyhydric alcohol is 10 to 1000 parts by weight based on 1 part by weight of the carboxy group-containing water-soluble polymer. The content of the acid in the raw material aqueous solution is an amount suitable for making the pH of the raw material aqueous solution 2.0 to 4.5, and the raw material aqueous solution is applied on a film or poured into a tray. , a step of drying to a water content of 15% by weight or less to prepare a gel sheet , wherein the amount of the carboxy group-containing water-soluble polymer is in the range of 0.1% to 10% by weight of the entire gel sheet is
A method for producing a cosmetic gel sheet, comprising: The manufacturing method according to claim 1 or 2 , wherein the cosmetic gel sheet generates heat when applied to the skin.

Images