ES2932630T3 - Alcogel sheet for cosmetic use and production process thereof - Google Patents

Abstract

A gel sheet for cosmetic use is provided, which is suitable for use in the fields of cosmetics and medicine. An alcogel sheet for cosmetic use according to the present invention is characterized by comprising a water-soluble nonwoven fabric or a water-soluble film and an alcogel which is laminated on the water-soluble nonwoven fabric or the water-soluble film. and contains a water-soluble polymer containing a carboxy group, a polyhydric alcohol and an acid as essential components, wherein the gel has a water content of 30% by mass or less. It is more preferable that the carboxy group-containing water-soluble polymer is a carboxy group-containing polysaccharide and that the polyhydric alcohol is glycerin. (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Alcogel sheet for cosmetic use and production process thereof

technical field

[0001] The present invention relates to new cosmetics using water-soluble polymeric alcogel and a manufacturing process thereof.

Background art

[0002] A cosmetic gel sheet is a skin care material, which can give a wet effect, a cool feeling and a warm feeling when placed on the skin. The gel sheet can exhibit the effects on the skin for a long period of time without flowing like the skin lotion and milky lotion.

[0003] A conventional cosmetic gel sheet has been used, gelled by dissolving hydrophilic resin in water, causing water, a humectant and an electrolyte to remain on the sheet. The conventional gel sheet is a hydrogel, which contains a large amount of water, and is essential for crosslinking the hydrophilic resin by means of a crosslinking agent.

[0004] CA 293 9895 describes a cosmetic gel sheet comprising, as an essential constituent, a water-soluble polymer containing carboxy groups, such as a polysaccharide, a polyhydric alcohol and an acid.

[0005] A sheet-type packaging agent containing collagen and polysaccharide such as chitin, chitosan, alginic acid and cellulose as components is known (Patent Document 1), and a skin care cosmetic gel sheet containing acid polyacrylic, polyalcohol, water and an external crosslinking agent as essential components (Patent Document 2).

[0006] A polysaccharide gel sheet containing red algae polysaccharide (such as agar and agarose) and fermentation polysaccharide (such as glucomannan and galactomannan) has been reported (Patent Document 3). Furthermore, a gel sheet consisting of a hydrophilic polymer with ionic groups and water has been reported (Patent Document 4). As the hydrophilic polymer with ionic groups, polyvinyl alcohol derivative, (meth)acrylic ester copolymer, cellulose derivative and polysaccharide derivative (such as xanthan gum and guar gum) are exemplified.

[0007] Two-component based sheet-like packaging cosmetics prepared by impregnating a water-insoluble amylose gel sheet with beauty fluid have been reported (Patent Document 5).

[0008] A biomedical adhesive gel sheet using natural polymer with hydrophilic groups, such as neutral polysaccharides, anionic polysaccharides, cationic polysaccharides and protein has also been reported (Patent Document 6), or alternatively, a collagen-containing gel sheet and a gelling agent and a polyalcoholic compound (Patent Documents 7 to 9).

[0009] The polysaccharide has been reported to be adequately mixed in a gel sheet (Patent Documents 10 and 11). As the preferable polysaccharide, neutral polysaccharide (for example, cellulose, agarose, methylcellulose, hydroxypropylcellulose, curdlan, xyloglucan, etc.), anionic polysaccharide (pectic acid, alginic acid, agarose, carboxymethylstarch, carboxymethyldextran, etc.), and polysaccharide are exemplified. cationic (chitin, chitosan, cationized cellulose, cationized starch, cationized dextran, etc.).

[0010] However, these conventional gel sheets that have been published are hydrogel characterized by containing a large amount of water. Therefore, these sheets have the problem that, due to the heavy weight of the sheet, the sheet slips unless the user stands calmly with his face up while the sheet is placed on his skin. Conventional gel sheet is of the so-called permanent crosslinking type, whereby an extremely high pH or high temperature is needed to break the crosslinking.

[0011] On the other hand, sheet-type cosmetics in which hyaluronic acid and a large amount of glycerin are mixed and the hyaluronic acid is pseudo-crosslinked by the association of carboxy groups of hyaluronic acid have also been reported (Patent Document 12). However, these sheet-like cosmetics had somewhat poor mechanical strength, thus requiring careful handling.

DOCUMENTS OF THE PRIOR ART

patent documents

[0012]

[Patent Document 1] JP 03-081213 A

[Patent Document 2] JP 11-228340 A

[Patent Document 3] JP 2003-518008 W

[Patent Document 4] JP 2005-145895 A

[Patent Document 5] JP 2005-213176 A

[Patent Document 6] JP 2008-137970 A

[Patent Document 7] JP 2009-091342 A

[Patent Document 8] JP 2009-108005 A

[Patent Document 9] JP 2009-108006 A

[Patent Document 10] JP 2009-108007 A

[Patent Document 11] JP 2009-108008 A

[Patent Document 12] JP 2014-024828 A

Summary of the invention

technical problem

[0013] The problem to be solved by the present invention is to provide a new and easy-to-use cosmetic gel sheet in which an alcogel is used and which solves the problems of the conventional permanent crosslinking type gel and the new type hydrogel sheet. pseudoreticulation.

Problem solution

[0014] The cosmetic gel sheet according to the present invention manufactured to solve the aforementioned problems is characterized in that the sheet comprises: a water-soluble non-woven fabric or a water-soluble film; and an alcogel remaining in the water-soluble nonwoven fabric or the water-soluble film and containing a carboxy group-containing water-soluble polymer, a polyalcohol and an acid as essential components, wherein the water content of the alcogel is 30% by mass or less.

[0015] As used in this invention, the carboxy group-containing water-soluble polymer refers to the water-soluble polymer having carboxy groups as a substituent in the molecule.

[0016] When a solution containing the water-soluble carboxy-containing polymer, the acid and the polyol is prepared and its pH is lowered by evaporation of water, the water-soluble polymer is pseudo-crosslinked by association of the carboxy groups , so that the solution gels easily. The cosmetic gel sheet of the present invention is an alcogel utilizing this property of the water-soluble polymer containing carboxy groups.

[0017] The low water content in the gel sheet, which does not present any physical problem, causes a higher energy cost for the evaporation of water. Therefore, the water can remain practically to a point where a property of the cosmetic alcohol sheet is not damaged.

[0018] The water content of the alcogel of the present invention is 30% by mass or less, preferably 20% by mass or less. As used in this invention, "water content" refers to a water content of the alcogel, and the mass of the water-soluble nonwoven fabric or water-soluble film is not included in the total mass.

[0019] For the alcogel of the present invention, if the water content of the gel exceeds 30% by mass, the water-soluble polymer is not sufficiently gelled, so that the mechanical strength of the gel sheet decreases. Therefore, a cosmetic sheet composed solely of the gel sheet is problematic in practical use. However, since the present invention uses the water soluble nonwoven fabric or the water soluble film (hereinafter, water soluble nonwoven fabric or the like), the gel sheet is kept on the water soluble nonwoven fabric. water or the like, even if the mechanical strength of the gel sheet itself decreases. Therefore, the gel sheet can have a higher water content. However, if the gel sheet includes too much water, the water may be transferred to the water-soluble nonwoven fabric or the like as a coating, and the water-soluble nonwoven fabric or the like may be dissolved.

[0020] Although carboxy group-containing synthetic polymers such as polyacrylic acid and copolymers thereof, and carboxy group-containing polysaccharides can be considered as the carboxy group-containing water-soluble polymer, the latter is more preferable in the present invention. . This is because the carboxy group-containing water-soluble polymer, which is a synthetic polymer, has a bad odor due to residual monomer.

[0021] The cosmetic alcogel sheet need not contain water-soluble divalent ions as in the case of the hydrogel sheet. In the case of the conventional hydrogel sheet containing a large amount of water (in a proportion of 70% by mass or more based on the gel sheet), in order to gel the carboxy group-containing water-soluble polymer, it is required crosslinking by water-soluble divalent metal ions (Patent Documents 1 and 2). According to the present invention, since the mutual association of the carboxyl group by reducing the water content in the gel is used, the metal salt is not required.

[0022] Moreover, in the gel sheet with a large amount of water and the mutual association by the divalent metal ions, even if the skin is massaged with water after applying the gel sheet, the carboxy group-containing polysaccharide does not it can dissolve in water. A mechanism of gel association is clearly different between the conventional hydrogel sheet and the cosmetic gel sheet according to the present invention, and as a result, they have different effects.

[0023] Although the water-soluble carboxy group-containing polymer gels in an acidic solution by mutual association of the carboxy group, if the pH approaches neutral, the gel structure breaks down and becomes an aqueous solution. Namely, the gel structure is reversibly in the gel state or the soluble state according to the change of pH. Therefore, when the sheet is placed on the skin in a gel state and then the skin is massaged with an appropriate amount of water, the polysaccharide gel is solubilized, whereby the mixed polysaccharide and valuable component can be effectively absorbed. for the skin

[0024] In an acidic concentration where the pH of the aqueous solution is 2.0 or less, since the gel structure is strong, the structure hardly converts to the soluble state even if an appropriate amount of water is added for the massage. As used in this invention, the proper amount refers to an amount so that it does not flow down a face when the cosmetic gel sheet is placed on the face and then water is added. There is practically no point in adding an excessive amount of water so that it does not stay on the face.

[0025] Polyalcohol has the property of generating heat upon contact with water. Polyol, as the major component of the alcohol sheet, generates heat when the gel sheet is placed on the skin, and then water is added, thereby producing a comfortable warm feeling on the skin. The conventional gel sheet does not significantly generate heat due to its high water content, whereas the alcogel sheet according to the present invention with low water content can give the sensation of heat.

[0026] As the polysaccharide with carboxy groups, xanthan gum, gellan gum, alginic acid, carboxymethylcellulose, hyaluronic acid with carboxy groups and the like are preferably used. They can be partially converted to a salt, such as the sodium salt or the potassium salt.

[0027] The molecular weight of the water-soluble carboxy group-containing polymer is preferably within a range of about 5*104 to 5*106 Daltons. A different water-soluble polymer, or the same water-soluble polymer with a different molecular weight can be mixed for use, as long as the molecular weight is within this range. Also, a water-soluble polymer within this molecular weight range and a water-soluble polymer with a molecular weight less than this range can be mixed for use.

[0028] As the acid used in the present invention, a monobasic acid such as hydrochloric acid, acetic acid and lactic acid, a polybasic acid such as citric acid, oxalic acid and tartaric acid, and the like can be used. Citric acid, tartaric acid and lactic acid are particularly preferable. Moreover, two or more kinds of the acid can be mixed for use.

[0029] The polyol used in the present invention is not particularly limited, but glycerin, propylene glycol, ethylene glycol, polyethylene glycol, 1,3-butylene glycol, dipropylene glycol, sorbitol and the like can be used. Among them, glycerin is particularly preferable.

[0030] The content of each component in the cosmetic alcohol sheet of the present invention is as follows. The content of the carboxy group-containing water-soluble polymer is preferably within a range of 0.1% by mass to 10% by mass based on the whole gel. If the content of the carboxy group-containing water-soluble polymer is less than 0.1 mass %, the gel is softened so that a gel with excellent elasticity cannot be formed. On the other hand, if the content is more than 10% by mass, the gel becomes hard so that the gel with excellent elasticity cannot be formed and the adhesiveness to the skin becomes poor.

[0031] The content of the polyol is preferably within a range of 10 to 1,000 or more parts by mass, more preferably within a range of 30 to 500 parts by mass, based on 1 part by mass of the water-soluble polymer that contains carboxy groups. If the content of the polyalcohol is less than 10 parts by mass, the sheet becomes a hard gel instead of a gel with excellent elasticity having adequate adhesion ability to skin. On the other hand, if the content is more than 1,000 parts by mass, the gel becomes soft or gel formation is impossible.

[0032] The acid content is adjusted so that the pH of the aqueous solution of the starting material is appropriate for the association of the water-soluble polymer containing carboxy groups. For example, when 120 mass parts of water based on 1 mass part of the water-soluble carboxy group-containing polymer are used, the acid content is preferably adjusted to a value necessary to establish the pH of the aqueous solution of 4 .5 to 2.0. If the water content is less than the amount described above, the pH can be adjusted to a lower value, while if the water content is higher, the pH can be adjusted to a higher value. In the case of the exemplified water content, if the pH is 4.5 or more, a gel with sufficient strength cannot be obtained when the water is dried. In contrast, a pH of 2.0 or less is not preferable, since the aqueous solution of the raw material is likely to gel easily before the water dries, and furthermore, although the gel sheet may be generated on drying. water, the gel sheet stimulates a face when placed.

[0033] In the case of the carboxy group-containing alcogel, water, which is originally a major component of the aqueous solution, is volatilized in a drying process, so that the polyol becomes the major component of the alcogel.

[0034] Although the alcogel sheet of the present invention is gelled due to pseudo-crosslinking between carboxy group-containing polymers, so that it has some mechanical strength, the strength is at most 0.1 N/cm2 as breaking load measured by a tensile testing machine and therefore the sheet is likely to break with careless handling.

[0035] However, the alcogel sheet of the present invention has improved the safety and handling property since it is kept on the water-soluble non-woven fabric or the like. With the water-soluble non-woven fabric or the like as a coating, the alcogel sheet of the present invention still maintains the following characteristics as fundamental properties: (1) it causes a feeling of warmth when applied to the skin; and (2) after its application to the facial skin, it is solubilized by massaging with an appropriate amount of water. Furthermore, the handling property and ease of use for users have been excellently improved, which increases its importance as a cosmetic.

[0036] As the water-soluble nonwoven fabric, those composed of water-soluble polymer fibers can be suitably used. It was confirmed that G-Polymer, the water-soluble PVOH manufactured by The Nippon Synthetic Chemical Industry Co.,Ltd. and Kuralon K-II, the PVOH nonwoven fabric manufactured by KURARAY CO.,LTD were suitable among the commercial products. To practically coat the gel sheet with the water soluble nonwoven fabric, the tackiness of the gel sheet can be used to directly laminate the water soluble nonwoven fabric. However, the strength of the laminate can be slightly increased by applying a water-soluble adhesive on the water-soluble nonwoven fabric and then laminating it on the gel sheet.

[0037] As the water-soluble film, those composed of the same polyvinyl alcohol as the non-woven fabric can be suitably used. It is desired that the degree of saponification is not high in order to improve the solubility in water. Specifically, Solublon TS or Solublon CA manufactured by AICELLO CORPORATION and the like can be used.

[0038] In the cosmetic alcogel sheet, the valuable component such as cosmetic and pharmaceutical components can be mixed within a range that does not affect the object and an effect of the present invention. Particularly, it is advantageous for its application as a cosmetic and as a parapharmaceutical. The blendable component includes, for example, a whitening component, an anti-wrinkle component, an anti-inflammatory component, a blood circulation-promoting component, an antimicrobial component, an antipruritic component, various vitamins and derivatives thereof, an antioxidant component, a pigment , an oily component, a fragrance and the like. The cosmetic and pharmaceutical components to be mixed can be added to the aqueous solution of the raw material.

[0039] The bleaching component is not particularly limited, but, for example, a vitamin C derivative is included, such as ascorbic acid phosphoric ester magnesium salt, ascorbic acid glucoside and acyl salts and derivatives thereof, ethylascorbic acid and ascorbyl palmitate, a-arbutin, p-arbutin, kojic acid, placenta extract, cysteine, glutathione, ellagic acid, rucinol, tranexamic acid, baicalein, adenosine and its phosphoric acid sodium salt, astaxanthin, ganoderma lucidum in staghorn form, oil-soluble licorice, lavender, lempuyang, burnet, resveratrol, ganoderma lucidum, extracts and tinctures thereof, or components contained therein, and the like.

[0040] The anti-wrinkle component is not particularly limited, but, for example, includes retinoids such as retinol, retinoic acid, retinol acetate and retinol palmitate, α-hydroxy acids such as citric acid, fruit acid, glycolic acid and lactic acid, α-hydroxy acid cholesterol, rutin derivative, N-methylserine, elastin, collagen, sericin, gotu kola extract, scutellaria baicalensis extract and the like.

[0041] The anti-inflammatory component is not particularly limited, but, for example, acid glycyrrhetin, 2K glycyrrhetinic acid, allantoin, epsilon-aminocaproic acid, azulene, shikonin, tranexamic acid and Coptis japonica, licorice, Terminalia, yarrow, lithospermum root, comfrey, aloe, butcher's blossom, horse chestnut, peach leaf, leaf loquat, and extracts and tinctures thereof, or components contained therein, and the like.

[0042] The blood circulation promoting component is not particularly limited, but, for example, includes vitamin E, nicotinic acid, nicotinic acid amide, benzyl nicotinate, nicomol, caffeine, capsaicin, nonanoic acid vanillylamide, shogaol, gingerol and the like.

[0043] The antimicrobial component is not particularly limited, but, for example, includes a cationic surfactant such as isopropylmethylphenol, triclosan, triclocarban, trichlorohydroxyphenol, halocarbon, benzalkonium chloride and benzethonium chloride, photosensitizer, zinc oxide, titanium, chitin, chitosan, hinokiol, anise and the like.

[0044] The antipruritic component is not particularly limited, but, for example, includes diphenhydramine hydrochloride, chlorpheniramine maleate, crotamiton, glycyrrhizin acid, menthol, camphor, rosemary oil, capsaicin, nonanoic acid vanillylamide, dibucaine and the like. .

[0045] The vitamins are not particularly limited, but, for example, are included as oil-soluble vitamins, vitamin A oil, cod liver oil, retinol acetate, retinol palmitate, retinol, dehydroretinol, vitamin A3, acid retinoic, vitamin D, vitamin D2 (ergocalciferol) vitamin D3 (cholecalciferol), vitamin derivatives, vitamin E (tocopherol), dl-a-tocopherol acetate, dl-a-tocopherol butyrate, tocopheryl nicotinate, nicotinic acid benzyl ester , natural vitamin E, vitamin K, vitamin U and the like. Also, included as water-soluble vitamins, vitamin B1 (thiamine), vitamin B2 (riboflavin tetrabutyrate), vitamin B6 (fatty acid ester such as pyridoxine dicaprylate and pyridoxine dipalmitate), vitamin B12 (cobalamin), vitamin B13 , vitamin B14, vitamin B15 (pangamic acid), folic acid, carnitine, thioctic acid, pantothenylic alcohol, pantothenic ethyl ether, pantothenic acid, nicotinic acid, nicotinic acid amide, choline, inositol, vitamin C (ascorbic acid), stearate ascorbyl, ascorbyl pantothenate, ascorbyl dipalmitate, vitamin H (biotin), vitamin P (hesperidin), Apprecier, and the like.

[0046] The antioxidant component is not particularly limited, but, for example, includes polyphenols such as anthocyanin, catechin, green tea polyphenol and apple polyphenol, carotenoid such as ascorbic acid, sodium ascorbate, sodium sulfate ascorbate , p-carotene and astaxanthin, p-diketone, such as tocopherols, tocopherol acetate, natural vitamin E, tocomonoenol, tocotrienol and curcumin, lignin, such as sesamin and sesamolin, phenol, such as eugenol and the like.

[0047] The anti-allergy component is not particularly limited, but, for example, a glycyrrhetinic acid derivative such as glycyrrhetinic acid and 2K glycyrrhetinic acid, licorice, chlorella, comfrey, Paeonia suffruticosa bark, Tilia cordata, Isodon japonicus, sage, shiso, mugwort, extracts and tinctures thereof or components contained therein, and the like.

[0048] The oily component includes olive oil, squalane, squalane, paraffin oil and the like. The addition of the oily component improves the feel of the alcogel sheet on the skin. Since the oily component is likely to cause phase separation when added in a large amount, the amount of the oily component in the alcogel sheet of the present invention is preferably 5% by mass or less.

[0049] The cosmetic alcogel sheet according to the present invention can be manufactured by: uniformly dissolving the carboxy group-containing water-soluble polymer, the acid and the polyol in water; adequate drying and transpiration of the water to make the gel sheet in an intended manner; and then laminating the gel sheet onto the water-soluble nonwoven fabric or the like.

[0050] Specifically, an aqueous solution containing the water-soluble carboxy group-containing polymer, the polyol and the acid is mixed for preparation with a propeller-type rotary stirrer. The prepared aqueous solution is applied on a polyethylene terephthalate film with a uniform thickness, then dried with hot air, and thus a transparent gel sheet with the uniform thickness is produced. In the aqueous solution drying process, drying is carried out so that the water content of the gel is 40% by mass or less. Preferably, the water content of the gel is 30% by mass or less. This is because there is a possibility that the drying of the gel will continue in the next step of integrating the water-soluble non-woven fabric or the like with the gel sheet.

[0051] Subsequently, the water-soluble nonwoven fabric or the like is laminated and pressed to integrate the nonwoven fabric and the gel sheet. The gel sheet contains water, although only 30% by mass or less, and the non-woven fabric or film is water soluble. Therefore, the water and valuable components of the gel sheet are transferred to the non-woven fabric or the like so that the gel sheet and the non-woven fabric or the like form an integrated sheet. TO Next, the gel sheet is cut into a circle, oval, comma or face shape to obtain a sheet-like cosmetic-like product. The non-woven fabric or the like may contain polyalcohol such as glycerin to facilitate water solubility.

[0052] The weight per unit area of the nonwoven fabric of the present invention is suitably 5 to 100 g/m 2 , and the thickness of the sheet is preferably 5 to 50 pm.

[0053] For the cosmetic gel sheet of the present invention, the thickness of the gel sheet alone is 40 to 600 pm, preferably 80 to 250 pm, and the thickness of the entire cosmetic gel sheet of the present invention it is from 50 to 700 pm, preferably from 100 to 350 pm.

[0054] When the cosmetic alcohol sheet of the present invention is applied on a face, it generates heat due to the reaction between the water vapor in the air passing through the non-woven fabric and the polyalcohol or due to absorption of water on the surface of the face, so that it gives a feeling of warmth to the face.

[0055] When the cosmetic alcohol sheet of the present invention is applied to a face and then the face is massaged with the addition of an appropriate amount of water, the alcohol sheet gradually dissolves giving a warm feeling to the face. This is because the gel dissolves by increasing the water content and thus the pH value. The water-soluble non-woven fabric or the like is dissolved simultaneously with the gel by supplying water.

Advantageous effects of the invention

[0056] In the cosmetic alcohol sheet according to the present invention, water is not an essential component and the carboxy group-containing water-soluble polymer is gelled in the polyol. This kind of cosmetic alcogel sheet has the following characteristics.

(1) Since the low water content is not suitable for the propagation of microorganisms, an antiseptic agent is not required.

(2) A main component is polyalcohol, whereby alcohol generates heat by hydration to give a feeling of comfort to the skin when the skin is massaged with water (hot water) after applying the alcogel sheet.

(3) The stability of a valuable and water-unstable cosmetic component is increased.

[0057] The cosmetic alcogel sheet according to the present invention utilizes an original excellent property of the water-soluble polymer and polysaccharide. The water-soluble carboxy-containing polymer gel which is not chemically cross-linked gives a sensation of warmth by hydration of the polyol when a small amount of water is added after application to the skin, and, when massaged into the skin, the gel dissolves, whereby the mixed component penetrates the skin. Thereafter, even when the gel is washed off with water, the effects remain to give a feeling of warmth, a feeling of moisture and a feeling of softness to the skin. Therefore, the gel is useful as a material to be used in a cosmetic field. These effects have not been observed in the conventional hydrogel sheet.

[0058] The cosmetic alcogel sheet of the present invention has improved mechanical strength when laminated on the water-soluble non-woven fabric or the like, so that it is easier to handle than conventional products.

Description of embodiments

[0059] Hereinafter, the present invention will be described with reference to Examples, but the present invention is of course not limited to the following Examples.

(Manufacturing process of Examples 1 to 6, as well as Comparative Examples 1 and 2)

[0060] Aqueous solutions containing water-soluble carboxy group-containing polymer, polyalcohol and acid were stirred and mixed according to the mixing ratios (part by mass) described in Table 1 with a propeller-type rotary agitator to prepare aqueous solutions of raw material. The tocopherol and Apprecier were dissolved in a small amount of ethanol and then added. The prepared raw material aqueous solutions were applied on polyethylene terephthalate films with a uniform thickness of 25 pm, and then dried at 80 °C for 5 to 30 minutes with a gear-type oven to obtain a cosmetic gel sheet with a thickness from about 200 pm. A water-soluble adhesive solution with a thickness after drying of about 10 pm was applied on the water-soluble nonwoven fabric and dried at 80°C for 20 minutes. Next, the gel sheet was laid on the water-soluble non-woven fabric and pressed with a roller to laminate the gel sheet and the non-woven fabric.

[0061] The water soluble nonwoven fabric was used for Examples 1 to 5, and the water soluble film was used for Example 6. The resulting sheets were cut to undergo various evaluations.

[0062] The standards and sources of each raw material are as follows. As hyaluronic acid, hyaluronic acid having a molecular weight of about 800,000 (FCH-80, Kikkoman Biochemifa Company) was used. As other raw materials, glycerin (concentrated glycerin, MIYOSHI OIL & FAT CO., LTD.), citric acid (NACALAI TESQUE, INC.), trisodium ascorbyl phosphate palmitate (Apprecier, SHOWA DENKO KK), tocopherol (NACALAI TESQUE , INC.), xanthan gum (SAN ^s H ^o Co, Ltd.), gellan gum (Wako Pure Chemical Industries, Ltd.), CMC1260 as carboxymethylcellulose (DAICEL FINECHEM LTD.), and alginic acid (Kikkoman Biochemifa Company). Lactic acid, ethylene glycol, hydrochloric acid and guaranteed reagent acetic acid (NACALAI TESQUE, INC.) were used. G-Polymer, the water-soluble PVOH having a weight per unit area of 30 g/m 2 (The Nippon Synthetic Chemical Industry Co.,Ltd.) was used as the water-soluble nonwoven fabric. As the water-soluble film, Solublon TS (thickness 30 pm, AICELLO CORPORATION) was used. Liquidyn AR-2090 (VIGteQnos Corporation) was used as the water soluble adhesive.

[0063] The amounts of hydrochloric acid and acetic acid are shown in parts converted by mass of the reagent from the aqueous solution.

(Comparison of properties of fabricated polysaccharide gel sheets)

[0064] The results of the evaluation of the polysaccharide gel sheets of Examples 1 to 6 and Comparative Examples 1 to 2 are summarized in Table 2. Note that since the gels of Comparative Examples were not in sheet form, but rather in liquid form containing a large amount of water, the various evidence proposing that the object to be tested must be a gel sheet did not make sense, so these gels were not evaluated.

1. Observation results of the properties

[0065] Observation results of flexibility and elasticity by eye and touch are shown. "A" means that both flexibility and elasticity were sufficient. "B" means that the flexibility was sufficient and the elasticity was weak but not problematic in practical use. "C" means that the object to be analyzed was not a gel but a liquid form.

2. Results of water content measurement

[0066] The results of the measurement of the water content in the gel are shown. The water content measurements were determined from the mass reduction values before and after heating the samples at 90°C for 1 hour.

3. Results of the skin adhesion test

[0067] The results of the skin adhesion test are shown when the polysaccharide gel sheets (2 cm*2 cm) were applied to the inside of the forearm of a human volunteer. "A" stands for excellent adhesion.

4. Results of the test on the sensation of heat

[0068] The results of the test on the sensation of heat on the skin when the polysaccharide gel sheets (2 cm*2 cm) were applied to the inside of the forearm of a human volunteer are shown. "A" means a strong sensation of heat on the skin, and "B" means some sensation of heat.

5. Solubility test

[0069] Polysaccharide gel sheets (2 cm*2 cm) were applied to the forearm of a human volunteer, on which 1 ml of water was dripped, and then the skin was massaged on the sheets for 3 minutes to observe the gel solubility. "A" means complete dissolution.

6. Test on handling property

[0070] "A" means that the gel sheet has good mechanical strength and therefore does not break from careless handling to some degree, so that the gel sheet is extremely easy to handle.

T l 21

[0071] From Table 1 it appears that the compositions of the aqueous solutions of Examples and Comparative Examples are suitable for the alcogel sheet raw material solution.

[0072] It follows from Table 2 that, for the stable generation of the alcogel, the aqueous solution of raw material should be dried to a water content of 30% by mass or less, preferably 20% by mass or less.

Claims (10)

1. A cosmetic alcogel sheet comprising: a water soluble non-woven fabric or a water soluble film; and an alcogel which is kept in the water-soluble nonwoven fabric or the water-soluble film and which contains a water-soluble polymer containing carboxy groups, a polyalcohol and an acid as essential components, wherein a water content of the alcogel is 30% by mass or less. The cosmetic alcogel sheet according to claim 1, wherein the water content of the alcogel is 20% by mass or less. The cosmetic alcogel sheet according to claim 1 or 2, characterized in that the carboxy group-containing water-soluble polymer is constituted of carboxy group-containing polysaccharides. The cosmetic alcohol sheet according to any one of claims 1 to 3, characterized in that a polyalcohol content is 10 to 1000 mass parts based on 1 mass part of the carboxy group-containing water-soluble polymer. The cosmetic alcohol sheet according to any one of claims 1 to 4, characterized in that the cosmetic alcohol sheet generates heat when placed on a skin. The cosmetic alcogel sheet according to any one of claims 3 to 5, characterized in that the water-soluble polymer containing carboxy groups is one or more compounds selected from a group consisting of xanthan gum, gellan gum, alginic acid, hyaluronic acid and carboxymethylcellulose. 7. The cosmetic alcohol sheet according to any one of claims 1 to 6, characterized in that the polyalcohol is glycerin. The cosmetic alcogel sheet according to any one of claims 1 to 7, characterized in that the acid is one or more compounds selected from a group consisting of citric acid, tartaric acid, lactic acid and hydrochloric acid. 9. A process for manufacturing a cosmetic alcohol sheet, characterized in that: an aqueous solution comprising a water-soluble polymer containing carboxy groups, a polyalcohol and an acid as essential components is applied on a film or poured into a tray ; the aqueous solution is dried to a water content of 30% by mass; and a water soluble non-woven fabric or a water soluble film is laminated to make the cosmetic alcogel sheet. 10. The method for manufacturing a cosmetic alcogel sheet according to claim 9, characterized in that, during the manufacture of the alcogel sheet, an acid content in the aqueous solution is an appropriate amount to allow obtaining a pH of the aqueous solution ranged from 2.0 to 4.5.