WO2017188424A1 - 化粧用アルコゲルシート及びその製造方法 - Google Patents
化粧用アルコゲルシート及びその製造方法 Download PDFInfo
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- WO2017188424A1 WO2017188424A1 PCT/JP2017/016879 JP2017016879W WO2017188424A1 WO 2017188424 A1 WO2017188424 A1 WO 2017188424A1 JP 2017016879 W JP2017016879 W JP 2017016879W WO 2017188424 A1 WO2017188424 A1 WO 2017188424A1
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- water
- soluble
- acid
- alcogel
- cosmetic
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/20—Halogens; Compounds thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/34—Alcohols
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/36—Carboxylic acids; Salts or anhydrides thereof
- A61K8/365—Hydroxycarboxylic acids; Ketocarboxylic acids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/73—Polysaccharides
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
Definitions
- the present invention relates to a new cosmetic using a water-soluble polymer alcogel and a method for producing the same.
- the cosmetic gel sheet is a skin care material, and gives a moisturizing effect and a feeling of coolness and heat when applied to the skin.
- the gel sheet does not flow like lotion or lotion, and is effective for the skin for a long time.
- a conventional cosmetic gel sheet is a gel obtained by dissolving a hydrophilic resin in water, and has been used by retaining water, a moisturizing agent, an electrolyte and the like therein.
- a conventional gel sheet is a hydrogel, contains a large amount of water, and it is essential to crosslink the hydrophilic resin with a crosslinking agent.
- Patent Document 1 Skin care cosmetics containing, as essential components, a sheet-like pack agent (Patent Document 1) containing polysaccharides such as collagen, chitin, chitosan, alginic acid, and cellulose, and polyacrylic acid, polyhydric alcohol, water, and an external cross-linking agent.
- Gel sheets are known (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 made of a hydrophilic polymer having an ionic group and water has been reported (Patent Document 4).
- hydrophilic polymer having an ionic group examples include polyvinyl alcohol derivatives, (meth) acrylic acid ester copolymers, cellulose derivatives, and polysaccharide derivatives (xanthan gum, guar gum, etc.).
- Patent Document 5 A two-component sheet-shaped pack cosmetic in which a cosmetic liquid is impregnated with a water-insoluble gel sheet made of amylose has also been reported (Patent Document 5).
- Natural polymer having hydrophilic group for example, neutral polysaccharide, anionic polysaccharide, biological adhesive gel sheet using cationic polysaccharide and protein, or collagen, gelling agent and polyhydric alcohol compound
- Patent Documents 7-9 There is also a report of a gel sheet (Patent Documents 7-9) containing It has also been pointed out that it is preferable to mix polysaccharides in the gel sheet (Patent Documents 10 and 11).
- Preferred polysaccharides include neutral polysaccharides (eg, cellulose, agarose, methylcellulose, hydroxypropylcellulose, curdlan, xyloglucan), anionic polysaccharides (pectinic acid, alginic acid, agarose, carboxymethyl starch, carboxymethyldextran). Etc.), and cationic polysaccharides (chitin, chitosan, cationized cellulose, cationized starch, cationized dextran, etc.).
- the conventional gel sheet that has been published so far is a hydrogel, characterized by containing a large amount of water. For this reason, there is a problem that the sheet slides down unless the sheet is heavy and the face affixed to the skin is faced up. In winter, it is cold and uncomfortable.
- the conventional gel sheet is a so-called permanent cross-linking type. To break the cross-linking, it has been necessary to set the pH to an extreme or high temperature.
- a sheet-like cosmetic in which hyaluronic acid and a large amount of glycerin are mixed and hyaluronic acid is pseudo-crosslinked by association of carboxy groups of hyaluronic acid has also been reported (Patent Document 12).
- this sheet-like cosmetic material is slightly poor in mechanical strength and needs attention in handling.
- the problem to be solved by the present invention is to solve the problems of the conventional permanent crosslinked gel and the new pseudo-crosslinked hydrogel sheet, and to provide a new and easy-to-use cosmetic gel sheet using an alcogel.
- a cosmetic gel sheet according to the present invention made to solve the above problems is a water-soluble nonwoven fabric or a water-soluble film, a carboxy group-containing water-soluble polymer held on the water-soluble nonwoven fabric or water-soluble film, a polyvalent It is characterized by having an alcogel containing alcohol and acid as essential components.
- the carboxy group-containing water-soluble polymer refers to a water-soluble polymer having a carboxy group as a substituent in the molecule.
- the cosmetic gel sheet of the present invention is an alcogel utilizing this property of a carboxy group-containing water-soluble polymer.
- the water content is preferably 30% by mass or less, and more preferably 20% by mass or less.
- the water content refers to the water content in the alcogel, and the mass of the water-soluble nonwoven fabric or water-soluble film is not included in the total mass.
- the gelation of the water-soluble polymer becomes insufficient, so that the mechanical strength of the gel sheet is weakened. is there.
- a water-soluble nonwoven fabric or a water-soluble film hereinafter referred to as a water-soluble nonwoven fabric
- there is too much water in the gel sheet there is a risk that the water will move to the water-soluble nonwoven fabric with the moisture lined and dissolve the water-soluble nonwoven fabric.
- carboxy group-containing water-soluble polymer synthetic carboxy group-containing polymers such as polyacrylic acid and copolymers thereof and carboxy group-containing polysaccharides are considered, but the latter is more preferable in the present invention. This is because the carboxy group-containing water-soluble polymer, which is a synthetic polymer, may have an unpleasant odor due to residual monomers.
- the present alcogel sheet need not contain water-soluble divalent ions as in the case of the hydrogel sheet.
- a conventional type hydrogel sheet containing a large amount of water (70% by mass or more of the gel sheet) it is necessary to crosslink with a water-soluble divalent metal ion in order to gel the carboxy group-containing water-soluble polymer (Patent Document) 1, 2).
- the amount of water in the gel is reduced and the association between carboxy groups is used, so no metal salt is required.
- the carboxyl group-containing polysaccharide does not dissolve in water.
- the conventional hydrogel sheet and the cosmetic gel sheet of the present invention have clearly different mechanisms of gel association, and as a result, have a heterogeneous effect.
- the carboxy group-containing water-soluble polymer becomes a gel due to the association of carboxy groups in an acidic aqueous solution, but when the pH approaches neutrality, the gel structure is destroyed and becomes an aqueous solution. That is, it reversibly takes a gel state and a soluble state as the pH changes. Therefore, when the gel is applied to the skin and then massaged by adding an appropriate amount of water, the polysaccharide gel is solubilized and the polysaccharide and blended valuable ingredients can be effectively absorbed by the skin.
- the appropriate amount refers to an amount that does not flow down from the face when a cosmetic gel sheet is applied to the face and water is added. It is practically meaningless to add so much water that it cannot be retained on the face.
- Polyhydric alcohol has the property of generating heat when contacted with water.
- the polyhydric alcohol which is the maximum component of the present alcogel sheet, generates heat when the gel sheet is applied to the skin and water is added, and gives a pleasant warm feeling to the skin. Since the conventional gel sheet contains a large amount of water, it does not generate significant heat, but the alcogel sheet of the present invention having a low water content produces a warm feeling.
- carboxy group-containing polysaccharide xanthan gum, gellan gum, alginic acid, carboxymethylcellulose, hyaluronic acid and the like having a carboxy group are preferably used. They may be partially converted to sodium salt or potassium salt.
- 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. If the molecular weight is within this range, different water-soluble polymers may be mixed, or the same water-soluble polymer having different molecular weights may be mixed and used. Also, those having a molecular weight in this range and those having a molecular weight smaller than this range can be mixed and used.
- monobasic acids such as hydrochloric acid, acetic acid and lactic acid
- polybasic acids such as citric acid, oxalic acid and tartaric acid
- Citric acid, tartaric acid and lactic acid are particularly preferred.
- 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. Of these, glycerin is particularly preferred.
- the preferred content of each component in the cosmetic alcogel sheet is as follows.
- the amount of the carboxy group-containing water-soluble polymer is preferably in the range of 0.1% by mass to 10% by mass of the entire gel. If the amount of the carboxy group-containing water-soluble polymer is less than 0.1% by mass, the gel becomes soft and an excellent elastic gel cannot be formed. On the other hand, if it exceeds 10% by mass, it becomes hard and an excellent elastic gel cannot be formed, and the adhesion to the skin is poor.
- the polyhydric alcohol is preferably in the range of 10 to 1000 parts by weight, and more preferably in the range of 30 to 500 parts by weight with respect to 1 part by weight of the carboxy group-containing water-soluble polymer. When the amount of the polyhydric alcohol is less than 10 mass, it becomes a hard gel rather than an excellent elastic gel having an appropriate skin adhesiveness. On the other hand, if it exceeds 1000 masses, the gel becomes soft or gel formation becomes impossible.
- the acid is adjusted in such an amount that the pH of the aqueous solution of the raw material becomes appropriate for the association of the carboxy group-containing water-soluble polymer.
- the amount of acid is preferably set to an amount necessary for adjusting the pH of the aqueous solution to 4.5 to 2.0. If the amount of water is less than this, the pH may be decreased, and if the amount is greater, the pH may be increased.
- the pH when the pH is 4.5 or more, even if the water is dried, the gel does not have sufficient strength.
- the pH is 2.0 or less, the aqueous raw material solution is likely to gel before drying the water, and even if it is dried, a gel sheet is generated, and it is not preferable because it feels irritation when the gel sheet is applied to the face.
- the alcogel sheet of the present invention is gelled by pseudo-crosslinking between carboxy group-containing polymers and has mechanical strength, the breaking stress is about 0.1 N / cm 2 when the strength is measured by a tensile tester, There is a high risk of inadvertent tearing during handling.
- the alcogel sheet of the present invention is held on a water-soluble nonwoven fabric or the like, it is safer and has improved handling properties. Even if it is lined with a water-soluble non-woven fabric, etc., the characteristics of this alcogel sheet are as follows: (1) When applied to the skin, it produces a warm feeling. (2) When applied to the facial skin with a suitable amount of water, the gel is solubilized. Is still held as a basic property. In addition, handling has been greatly improved, user convenience has been greatly improved, and its significance as a cosmetic has also been strengthened.
- water-soluble nonwoven fabric those made of water-soluble polymer fibers can be suitably used.
- water-soluble PVOH, G-Polymer manufactured by Nippon Synthetic Chemical Industry Co., Ltd., water-soluble PVOH nonwoven fabric manufactured by Kureha Co., Ltd., Claron K-II, etc. were suitable.
- the water-soluble nonwoven fabric may be directly laminated using the adhesiveness of the gel sheet.
- the water-soluble adhesive is thinly coated on the water-soluble nonwoven fabric and then applied to the gel sheet. Lamination increases the laminate strength.
- the water-soluble film a film made of polyvinyl alcohol which is the same material as the nonwoven fabric can be suitably used.
- the degree of saponification is not high.
- SOLBRON TS manufactured by Aicello Co., Ltd. or SOLBRON CA can be used.
- the cosmetic alcogel sheet can be blended with valuable ingredients such as cosmetics and pharmaceutical ingredients as long as the objects and effects of the present invention are not affected. It is particularly advantageous for applications as cosmetics and quasi drugs.
- components that can be blended include whitening components, anti-wrinkle components, anti-inflammatory components, blood circulation promoting components, antibacterial components, anti-pruritic components, various vitamins and derivatives thereof, antioxidant component pigments, oil components, and fragrances. What is necessary is just to add the cosmetics and pharmaceutical component to mix
- the whitening component is not particularly limited.
- ascorbic acid phosphate magnesium salt ascorbic acid glucoside and its salts and acylated derivatives, ethyl ascorbic acid, vitamin C derivatives such as ascorbyl palmitate, ⁇ -arbutin, ⁇ - Arbutin, Kojic acid, Placenta extract, Cysteine, Glutathione, Ellagic acid, Lucinol, Tranexamic acid, Baicalein, Adenosine and its sodium phosphate salt, Astaxanthin, Deer anteater, Oil-soluble licorice, Lavender, Lumpuyan, Waremokou, Resveratrol, Ganoderma and their extracts, tinctures or ingredients contained in them.
- the anti-wrinkle component is not particularly limited.
- retinoids such as retinol, retinoic acid, retinol acetate, and retinol palmitate
- ⁇ -hydroxy acids such as citric acid, fruit acid, glycolic acid, and lactic acid
- ⁇ -hydroxy acid cholesterol a compound that has a high degree of retinol
- Rutin sugar derivatives N-methylserine, elastin, collagen, sericin, camellia extract, golden extract, and the like.
- the anti-inflammatory component is not particularly limited. Examples include butcher bloom, maronier, peach leaf, loquat leaf and their extracts, tinctures or components contained in them.
- the blood circulation promoting component is not particularly limited, and examples thereof include vitamin Es, nicotinic acid, nicotinamide, benzyl nicotinate, nicomol, caffeine, capsaicin, vanillyl nonanoate, gingerol, gingerol, and the like.
- Antibacterial components are not particularly limited.
- 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 are examples of cationic surfactants such as isopropylmethylphenol, triclosan, triclocarban, trichlorohydroxyphenol, halocarban, benzalkonium chloride, and benzethonium chloride.
- the anti-pruritic component is not particularly limited, and examples thereof include diphenhydramine hydrochloride, chlorpheniramine maleate, crotamiton, glycyrrhizic acids, menthol, camphor, rosemary oil, capsaicin, nonanoic acid vanillylamide, dibucaine and the like.
- the vitamins are not particularly limited.
- vitamin B 1 thyamine
- vitamin B 2 riboflavin butyrate ester
- vitamin B 6 fatty acid ester such as pyridoxine dicaprylate and pyridoxine dipalmitate
- vitamin B 12 cobalamin
- vitamin B 13 Vitamin B 14
- Vitamin B 15 pangaminic acid
- folic acid carnitine
- thioctic acid pantotenyl alcohol
- pantotenyl ethyl ether pantothenic acid
- nicotinic acid nicotinamide
- choline inositol
- vitamin C ascorbic acid
- Ascorbyl stearate ascorbyl pantothenate
- vitamin P hesperidin
- aplesia and the like.
- Antioxidant components are not particularly limited.
- polyphenols such as anthocyanins, catechins, green tea polyphenols, apple polyphenols, carotenoids such as ascorbic acid, sodium ascorbate, sodium ascorbate sulfate, ⁇ -carotene, astaxanthin, and tocopherols , Tocopherol acetate, natural vitamin E, tocomonoenol, tocotrienol, ⁇ -diketones such as curcumin, lignans such as sesamin and sesamolin, phenols such as eugenol, and the like.
- the anti-allergic component is not particularly limited, and examples thereof include glycyrrhetic acid derivatives such as glycyrrhetic acid and glycyrrhizic acid 2K, licorice, chlorella, comfrey, button pi, jujube, sage, perilla, mugwort and extracts thereof. Examples include tincture or components contained therein.
- Oil components include olive oil, squalane, squalene, paraffin oil and the like.
- the amount of the oil component in the alcogel sheet of the present invention is preferably 5% by mass or less.
- the cosmetic alcogel sheet of the present invention is a gel sheet obtained by uniformly dissolving a carboxy group-containing water-soluble polymer, an acid and a polyhydric alcohol in water, and appropriately drying and evaporating water so as to have a desired form. Thereafter, it can be laminated on a water-soluble nonwoven fabric or the like. Specifically, an aqueous solution containing a carboxy group-containing water-soluble polymer, a polyhydric alcohol, and an acid is mixed and prepared with a propeller-type rotary stirrer. The prepared aqueous solution is applied on a polyethylene terephthalate film so as to have a uniform thickness, and dried with warm air to produce a transparent and uniform gel sheet.
- the gel is dried so that the water content of the gel is 40% by mass or less. Preferably, it is 30 mass% or less. This is because the drying of the gel may proceed during the subsequent process of integrating the water-soluble nonwoven fabric and the gel sheet.
- a water-soluble nonwoven fabric or the like is laminated and pressure bonded to integrate the nonwoven fabric and the gel sheet.
- the gel sheet contains water in an amount of 30% by mass or less and the nonwoven fabric or film is water-soluble, the moisture and valuable components in the gel sheet are transferred to the nonwoven fabric and the like by pressure bonding, and the gel sheet and the nonwoven fabric are integrated. Sheet.
- the gel sheet is cut into a circular shape, an oval shape, a slanted ball shape, and a face shape, and this is made into a product as a sheet-like cosmetic.
- the nonwoven fabric or the like may contain a polyhydric alcohol such as glycerin in order to promote water solubility.
- the nonwoven fabric according to the present invention suitably has a basis weight of 5 to 100 g / m 2 , and in the case of a film, a thickness of 5 to 50 ⁇ m is preferable.
- the thickness of the cosmetic gel sheet of the present invention is 40 to 600 ⁇ m, preferably 80 to 250 ⁇ m, for the gel sheet alone, and the total thickness of the cosmetic gel sheet of the present invention is 50 to 700 ⁇ m, preferably 100 to 350 ⁇ m. .
- this cosmetic alcogel sheet When this cosmetic alcogel sheet is applied to the face, water vapor in the air passes through the nonwoven fabric and reacts with the polyhydric alcohol or absorbs moisture on the face surface to generate heat and give a warm feeling to the face. After applying this cosmetic alcogel sheet to the face and applying an appropriate amount of water for massage, the alcogel sheet gradually dissolves while giving warmth to the face. This is because the amount of water increases and the pH value rises so that the gel dissolves.
- the water-soluble nonwoven fabric dissolves simultaneously with the gel by supplying water.
- water is not an essential component, and a carboxy group-containing water-soluble polymer is gelated in a polyhydric alcohol.
- a cosmetic alcogel 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 present alcogel sheet is applied to the skin and massaged with water (hot water), the alcohol generates heat due to hydration and gives a pleasant sensation to the skin. (3) Stability of valuable cosmetic ingredients that are unstable to water is increased.
- the cosmetic alcogel sheet of the present invention utilizes the excellent characteristics inherent in water-soluble polymers and polysaccharides.
- Carboxy group-containing water-soluble polymer gels that do not undergo chemical crosslinking generate a warm sensation due to the hydration of polyhydric alcohol when a small amount of water is added to the skin.
- the gel dissolves and the ingredients penetrate into the skin. .
- the effect persists, giving the skin a warm, moist and smooth feeling. Therefore, it is useful as a material used in the beauty field. Such an effect is not seen in the conventional hydrogel sheet.
- the cosmetic alcogel sheet of the present invention was laminated on a water-soluble nonwoven fabric or the like, the mechanical strength increased and it became easier to handle than the conventional product.
- a water-soluble pressure-sensitive adhesive solution was applied to a thickness of about 10 ⁇ m after drying on a water-soluble nonwoven fabric, dried at 80 ° C. for 20 minutes, covered with a gel sheet, and pressure-bonded with a roller to laminate the gel sheet and the nonwoven fabric.
- a water-soluble nonwoven fabric was used, and in Example 6, a water-soluble film was used. The obtained sheet was cut and subjected to various evaluations.
- Hyaluronic acid having a molecular weight of about 800,000 FCH-80 manufactured by Kikkoman Biochemifa Corporation
- Other raw materials include glycerin (concentrated glycerin, Miyoshi oil and fat Co., Ltd.), citric acid (Nakarai Tex Co., Ltd.), ascorbyl palmitate trisodium (Apressie, Showa Denko Co., Ltd.), tocophenol (Nakarai Tex Co., Ltd.), For xanthan gum (Sanki Co., Ltd.), gellan gum (Wako Pure Chemical Industries, Ltd.) and carboxymethyl cellulose, CMC1260 (Daicel Finechem Co., Ltd.) and alginic acid (Kikkoman Biochemifa Co., Ltd.) were used.
- lactic acid ethylene glycol, hydrochloric acid and acetic acid
- reagent special grades Nacalai Tesque
- water-soluble film SOLBRON TS (thickness 30 ⁇ m) (Aicello Co., Ltd.) was used.
- Liquidin AR-2090 Big Technos was used as the water-soluble adhesive.
- the amounts of hydrochloric acid and acetic acid are equivalent parts by mass from the aqueous solution reagent.
- Skin adhesion test results The results of adhesion to the skin when a polysaccharide gel sheet (2 cm ⁇ 2 cm) is applied to the inner side of the forearm of a human volunteer are shown. A shows that it adhered well. Warmth test result When a polysaccharide gel sheet (2 cm ⁇ 2 cm) is applied to the inner side of the forearm of a human volunteer, the result of warmth to the skin is shown. A indicates that the skin felt a high warm sensation, B indicates that it felt some warm sensation,
- the aqueous solution composition is suitable as the raw material solution for the alcogel sheet in both the examples and the comparative examples. From Table 2, it can be seen that it is necessary to dry the water so that the water content is 30% by mass or less, preferably 20% by mass or less in order to produce the alcogel stably.
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Abstract
Description
紅藻多糖類(寒天及びアガロース等)と発酵多糖類(グルコマンナン、ガラクトマンナン等)とを含む多糖類ゲルシートも報告されている(特許文献3)。また、イオン性基を有する親水性高分子と水からなるゲルシートも報告されている(特許文献4)。イオン性基を有する親水性高分子としては、ポリビニルアルコール誘導体、(メタ)アクリル酸エステル共重合体、セルロース誘導体、多糖類誘導体(キサンタンガム、グアーガム等)が例示されている。アミロースよりなる水不溶性のゲルシートに美容液が含浸された、2成分系のシート状パック化粧料も報告されている(特許文献5)。
ゲルシートに多糖類を混和すると好適なことも指摘されている(特許文献10、11)。好ましい多糖類としては、中性多糖類(例えば、セルロース、アガロース、メチルセルロース、ヒドロキシプロピルセルロース、カードラン、キシログルカンなど)、アニオン性多糖類(ペクチン酸、アルギン酸、アガロース、カルボキシルメチルデンプン、カルボキシルメチルデキストランなど)、カチオン性多糖類(キチン、キトサン、カチオン化セルロース、カチオン化デンプン、カチオン化デキストランなど)が例示されている。
一方、ヒアルロン酸と多量のグリセリンを混合し、ヒアルロン酸のカルボキシ基同士の会合によりヒアルロン酸を疑似架橋させたシート状の化粧料も報告されている(特許文献12)。しかしながらこのシート状化粧料は機械的強度にやや乏しく取り扱いに注意が必要であった。
ここにカルボキシ基含有水溶性高分子とは、分子内に置換基としてカルボキシ基を有する水溶性高分子をいう。
本発明のアルコゲルにおいて、含水量は30質量%以下であることが好ましく、20質量%以下であるとなお好ましい。ここに含水量とはアルコゲル中の含水量をいい、水溶性不織布もしくは水溶性フィルムの質量は全体の質量に含まない。
また、多量の水を含み2価金属イオンにより会合したゲルシートは、皮膚に適用後水とともにマッサージしても、カルボシキ基含有多糖類が水に溶けることはない。従来型ハイドロゲルシートと本発明の化粧用ゲルシートとはゲル会合の機構が明確に異なり、その結果異質の効果を有する。
前記水溶液のpHが2.0以下となる酸濃度では、ゲル構造が強固であるため適量の水を加えてマッサージしても可溶状態になりにくい。ここで適量とは、化粧用ゲルシートを顔面に貼付し水を加えるとき、顔面から流れ落ちない程度の量をいう。顔面に保持できないほどの多量の水を加えることは実用上意味を有しない。
多価アルコールは、カルボキシ基含有水溶性高分子1質量部に対し10~1000質量部の範囲が好ましく、30~500質量部の範囲がより好ましい。多価アルコールの量が10質量より少ないと、適度の皮膚貼付性を有する優れた弾性体のゲルではなく硬いゲルとなる。一方、1000質量を超えるとゲルが柔らかくなるかあるいはゲル形成が不可能となる。
しかし、本発明のアルコゲルシートは水溶性不織布等上に保持しているので、より安全で取り扱い性が改良されている。水溶性不織布等で裏打ちしても本アルコゲルシートの特徴である、(1)皮膚に適用すると温感を生じる、(2)顔面皮膚に適用後適量の水と一緒にマッサージするとゲルが可溶化してしまう、は依然として基本性質として保持している。しかも取り扱い性は非常に改善されユーザーの使い勝手が極めて向上し化粧料としての意義も強まった。
水溶性フィルムは、不織布と同素材のポリビニルアルコールをからなるフィルムを好適に用いうる。水溶性を上げるために鹸化度が高くないことが望ましい。具体的には、株式会社アイセロ製ソルブロンTS、あるいはソルブロンCAなどが使用できる。
配合する化粧品や医薬品成分は、原料水溶液に添加すればよい。
抗アレルギー成分としては、特に限定されないが、例えば、グリチルレチン酸、グリチルリチン酸2K,などのグリチルレチン酸誘導体、甘草、クロレラ、コンフリー、ボタンピ、フユボダイジュ、エンメイソウ、セージ、シソ、ヨモギ及びそれらのエキス、チンキ或いはそれらに含まれる成分等が挙げられる。
具体的には、カルボキシ基含有水溶性高分子と多価アルコールと酸とを含む水溶液をプロペラ式回転型撹拌装置で混和し調製する。この調製した水溶液をポリエチレンテレフタレートフィルム上に均一の厚みになるように塗布し、温風で乾燥することにより、透明で、均一な厚みのゲルシートを製造する。前記水溶液の乾燥工程においては、ゲルの含水量が40質量%以下となるように乾燥させる。好ましくは、30質量%以下である。その後の水溶性不織布等とゲルシートとの一体化の工程中にゲルの乾燥が進行する可能性があるからである。
本発明における不織布は目付量5~100g/m2が適当であり、フィルムの場合は5~50μmの厚さが好ましい。
本化粧用アルコゲルシートを顔に適用後適量の水を与えてマッサージすると、顔面に温感を与えつつアルコゲルシートは次第に溶解する。水分量が増え、pH値が上昇するためにゲルが溶解するためである。水溶性不織布等は水の供給によりゲルと同時に溶解する。
(1)水を少量しか含まないので微生物の繁殖に適さず、防腐剤を必要としない。
(2)主成分が多価アルコールであり、本アルコゲルシートを皮膚に適用し水(お湯)でマッサージすれば、アルコールが水和により発熱し肌に心地よい感覚をあたえる。
(3)水に不安定な化粧品有価成分の安定性が増す。
カルボキシ基含有水溶性高分子、多価アルコール及び酸の水溶液を、表1に記載の配合比(質量部)によりプロペラ式回転型攪拌装置で攪拌混合して原料水溶液を調製した。トコフェロールやアプレシエは少量のエタノールに溶解させて添加した。調製した原料水溶液を25μmのポリエチレンテレフタレートフィルム上に均一の厚みとなるよう塗布し、ギアオーブンで80℃、5~30分間乾燥し、約200μmの厚みの化粧用ゲルシートした。水溶性不織布上に水溶性粘着剤溶液を乾燥後の厚さ約10μmに塗布し80℃で20分乾燥させその上にゲルシートをかぶせてローラーで圧着しゲルシートと不織布等をラミネートした。
実施例1~5においては水溶性不織布を用い、実施例6においては水溶性フィルムを用いた。得られたシートを裁断して各種の評価に供した。
塩酸及び酢酸の量は、水溶液試薬からの換算質量部である。
実施例1~6、及び比較例1~2の多糖類ゲルシートの評価結果を表2にまとめる。なお、比較例のゲルは水分が多くシートではなく液体であったため、ゲルシートを前提とする各種試験を実施することは無意味であったので評価を実施しなかった。
1.性状観察結果
肉眼及び感触による柔軟性、弾性に関する観察結果を示す。Aは柔軟性、弾性、すべて十分。Bは柔軟性十分、弾性弱いが実用上差し支えない。Cはゲルではなく液体状態。
2.水分量測定結果
ゲル中の含水量の測定結果を示す。含水量の測定は試料を90℃で1時間加熱し加熱前後の質量減少から求めた。
多糖類ゲルシート(2cm×2cm)をヒトボランティア前腕内側に適用する時皮膚への密着性の結果を示す。Aはよく密着したことを示す
4.温感試験結果
多糖類ゲルシート(2cm×2cm)をヒトボランティア前腕内側に適用する時皮膚への温感の結果を示す。Aは高い温感を皮膚に感じたことを、Bは温感を多少感じたことを示す、
ヒトボランティアの前腕部に多糖類ゲルシート(2cm×2cm)を適用し1mlの水を滴下して3分間シート上からマッサージしゲルの溶解性を観察した。Aは完全に溶解したことを示す
6.取り扱い性試験
Aはシートの機械的強度が強く多少不注意に取り扱ってもゲルシートが破れることがなく、取り扱いがきわめて容易であることを示す
表2より、アルコゲルが安定に生成するためには、水分を30質量%以下、好ましくは20質量%以下となるよう乾燥する必要があることがわかる。
Claims (11)
- 水溶性不織布もしくは水溶性フィルムと、
該水溶性不織布上もしくは水溶性フィルム上に保持されたカルボキシ基含有水溶性高分子、多価アルコール及び酸を必須構成成分とするアルコゲルとを有する化粧用アルコゲルシート。 - 前記アルコゲルの含水量が30質量%以下である請求項1に記載の化粧用アルコゲルシート。
- 前記アルコゲルの含水量が20質量%以下である請求項1に記載の化粧用アルコゲルシート。
- 前記カルボキシ基含有水溶性高分子がカルボキシ基含有多糖類であることを特徴とする請求項1~3のいずれか1項に記載の化粧用アルコゲルシート。
- 前記カルボキシ基含有水溶性高分子1質量部に対し、前記多価アルコール含量が10~1000質量部であることを特徴とする請求項1~4のいずれか1項に記載の化粧用アルコゲルシート。
- 皮膚貼付により発熱することを特徴とする請求項1~5のいずれか1項に記載の化粧用アルコゲルシート。
- 前記カルボキシ基含有多糖類が、キサンタンガム、ゲランガム、アルギン酸、ヒアルロン酸及びカルボキシメチルセルロースからなる群から選ばれる1又は複数の化合物であることを特徴とする請求項4~6のいずれか1項に記載の化粧用アルコゲルシート。
- 前記多価アルコ-ルが、グリセリンであることを特徴とする請求項1~7のいずれか1項に記載の化粧用アルコゲルシート。
- 前記酸が、クエン酸、酒石酸、乳酸及び塩酸からなる群から選ばれる1又は複数の化合物であることを特徴とする請求項1~8のいずれか1項に記載の化粧用アルコゲルシート。
- カルボキシ基含有水溶性高分子、多価アルコール及び酸を必須成分として含む水溶液をフィルム上に塗布するか又はトレイに流し込み、含水量が30質量%以下となるように乾燥させ、水溶性不織布もしくは水溶性フィルムをラミネートして化粧用アルコゲルシートを製造することを特徴とする化粧用アルコゲルシートの製造方法。
- 前記アルコゲルシートを製造するにあたり、該水溶液中の前記酸の含有量が、該水溶液のpHを2.0~4.5とするに適当な量であることを特徴とする請求項10に記載の化粧用アルコゲルシートの製造方法。
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