Mask for caring for keratin materials

Abstract

A facial mask for caring for keratin materials comprises: A) a mask sheet containing at least one water-insoluble polyvalent metal salt, loaded with at least one glycosaminoglycan; and B) a composition on said mask sheet comprising: a) at least one nonionic polysaccharide selected from homopolymers of mannose, copolymers of mannose and glucose, copolymers of mannose and galactose, and combinations thereof; and b) at least one water-soluble alkali metal salt. A non-therapeutic method of caring for keratin materials with said mask is also disclosed.

Description

Technical Field

[0001] This invention relates to a facial mask for caring for keratin materials and a non-therapeutic method of caring for keratin materials with said facial mask. Background Technology

[0002] The skin is the body's protective barrier. It protects the body's internal organs from physical damage (such as trauma) and biological damage (such as bacteria, viruses, or fungi).

[0003] We are always developing formulations dedicated to skin care.

[0004] Hydrogels are solid gels containing different types of polymers that can hold a large amount of water. This technology is widely used as a medical dressing to provide soothing or wound-healing effects. In the cosmetics industry, hydrogels are used as a base for sheet masks.

[0005] Hydrogel masks release cosmetic ingredients at room temperature and deliver them to the skin.

[0006] However, some hydrogel masks are unstable at high temperatures such as 45°C, which manifests as too much or too little exudate released from the composition of the hydrogel mask, thus adversely affecting their shelf life.

[0007] Therefore, it is necessary to develop a face mask that is stable at high temperatures, such as 45°C. Summary of the Invention

[0008] One object of the present invention is to develop a face mask that is stable at high temperatures, such as 45°C.

[0009] Therefore, according to a first aspect, the present invention provides a facial mask preferably used for caring for keratin materials, comprising: A) A facial mask sheet containing at least one water-insoluble polyvalent metal salt, loaded with at least one glycosaminoglycan, and B) The composition on the mask sheet, comprising: a) At least one nonionic polysaccharide selected from homopolymers of mannose, copolymers of mannose and glucose, copolymers of mannose and galactose, and combinations thereof; and b) At least one water-soluble alkali metal salt.

[0010] According to a second aspect, the present invention also provides a non-therapeutic method for caring for keratin materials, comprising applying a mask according to the invention onto the keratin material.

[0011] The inventors have discovered that the face mask of the present invention is stable at high temperatures, such as 45°C, for at least 2 months.

[0012] The viscosity of the exudate from the composition of the mask of the present invention is a key parameter for measuring the stability of the mask at high temperatures.

[0013] As used herein, “stable” means that the exudate from the composition of the mask of the present invention has a viscosity of 50 mPa·s to 350 mPa·s after the mask has been stored at 45°C for 2 months.

[0014] Other subjects, features, aspects and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practice of the invention. Detailed Implementation

[0015] As used herein, unless otherwise stated, the limits of numerical ranges are included within this range, particularly in expressions “between… and…” and “from… to…”.

[0016] As used herein, the term “comprising” should be interpreted as encompassing all specifically mentioned elements as well as optional, additional, or unspecified elements.

[0017] As used herein, the use of the term “comprising” also discloses an implementation scheme in which there are no elements other than those specifically mentioned (i.e., “composed of”).

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Where the definitions of terms in this specification conflict with the meanings commonly understood by one of ordinary skill in the art to which this invention pertains, the definitions set forth herein shall prevail.

[0019] Unless otherwise specified, all numerical values ​​used in the specification and claims to represent component quantities, etc., should be understood to be modified by the term "approximately". Therefore, unless otherwise indicated, the numerical values ​​and parameters described herein are approximate and can be changed as needed to obtain the desired performance.

[0020] As used herein, the expression "at least one" is equivalent to the expression "one or more".

[0021] For the purposes of this invention, the term "keratin material" is intended to encompass skin. Facial skin and ocular skin are most particularly considered according to this invention.

[0022] The facial mask according to the present invention comprises: A) A facial mask sheet containing at least one water-insoluble polyvalent metal salt, loaded with at least one glycosaminoglycan, and B) The composition on the mask sheet, comprising: a) At least one nonionic polysaccharide selected from homopolymers of mannose, copolymers of mannose and glucose, copolymers of mannose and galactose, and combinations thereof; and b) At least one water-soluble alkali metal salt.

[0023] Facial mask sheet The facial mask according to the present invention comprises a facial mask sheet containing at least one water-insoluble polyvalent metal salt.

[0024] Preferably, the mask sheet is a water-insoluble mask sheet.

[0025] For the purposes of this invention, the term "water-insoluble facial mask sheet" refers to a facial mask sheet that is insoluble in water, for example having a solubility of less than 0.01 g / 100 g of water, or only slightly soluble in water, for example having a solubility of less than 0.5 g / 100 g of water, and does not disintegrate into a bulk state when soaked in water.

[0026] The mask sheet can be made of woven or nonwoven fabric.

[0027] Preferably, the mask sheet comprises at least one water-insoluble polyvalent metal salt and at least one other fiber selected from natural fibers such as cotton, pulp, bamboo, and cellulose fibers; semi-natural fibers such as viscose rayon fibers; and synthetic fibers such as polyester fibers, polyethylene terephthalate fibers, polyethylene fibers, and polypropylene fibers. Two or more of the other fibers selected may be used in combination.

[0028] Facial mask sheets can be made in a variety of shapes and forms, such as flat pads, thick pads, and sheets of irregular thickness, depending on the intended use and characteristics of the mask. For example, facial mask sheets are typically designed to adhere to specific areas of skin when applied to the face. Therefore, when applying the mask to the face, the mask sheet is designed to conform to the shape of the face, avoiding the eye, nostril, and mouth areas as needed. Non-limiting examples of facial mask sheets that can be used in this invention are described, for example, in patent applications WO02 / 062132 or EP 2489286A.

[0029] Preferably, the water-insoluble polyvalent metal salt is selected from alginate.

[0030] More preferably, the water-insoluble polyvalent metal salt is selected from calcium alginate, strontium alginate, zinc alginate, copper alginate, manganese alginate, and combinations thereof.

[0031] Even more preferably, the water-insoluble polyvalent metal salt is calcium alginate.

[0032] Advantageously, the mask sheet contains 0.5% to 30% by weight, preferably 2% to 25% by weight, more preferably 5% to 20% by weight, and even more preferably 8% to 18% by weight of a water-insoluble polyvalent metal salt relative to the total weight of the mask sheet.

[0033] Specifically, the mask sheet contains 2% to 30% by weight, preferably 5% to 20% by weight, and more preferably 8% to 18% by weight of water-insoluble alginate, especially calcium alginate, relative to the total weight of the mask sheet.

[0034] Glycosaminoglycans The mask sheet is loaded with at least one glycosaminoglycan.

[0035] Glycosaminoglycans (GAGs) are also known as acidic mucopolysaccharides due to their high water-holding capacity, carbohydrate properties, and acidic properties derived from the numerous negative charges on them. The strong anionic nature of GAGs can be explained by the presence of carboxylate groups.

[0036] Suitable examples of glycosaminoglycans are hyaluronic acid (HA), heparin sulfate (HS), heparin (HP), chondroitin, chondroitin sulfate (CS), chondroitin 4-sulfate or chondroitin sulfate A (CSA), chondroitin 6-sulfate or chondroitin sulfate C (CSC), dermatan sulfate or chondroitin sulfate B (CSB), and keratin sulfate (KS).

[0037] Preferably, the glycosaminoglycan is selected from hyaluronic acid and its derivatives.

[0038] In the context of this invention, the term "hyaluronic acid and its derivatives" encompasses the basic unit of hyaluronic acid, which includes the smallest portion of hyaluronic acid comprising a disaccharide dimer, namely D-glucuronic acid and N-acetylglucosamine.

[0039] In this invention, the term "hyaluronic acid and its derivatives" also includes linear polymers comprising the aforementioned polymeric units linked together in a chain via alternating β(1,4) and β(1,3) glycosidic bonds, having a weight-average molecular weight (M) between 380 and 13,000,000 g / mol. W This weight-average molecular weight depends largely on the source and / or preparation method of hyaluronic acid.

[0040] The term "hyaluronic acid and its derivatives" also includes all portions or subunits of hyaluronic acid having a weight-average molecular weight, particularly within the aforementioned weight-average molecular weight range.

[0041] Preferably, the hyaluronic acid fractions suitable for the uses covered by this invention have a weight-average molecular weight between 50,000 and 5,000,000 g / mol, particularly between 100,000 and 5,000,000 g / mol, and particularly between 400,000 and 5,000,000 g / mol. In this case, the hyaluronic acid fractions with a weight-average molecular weight between 400,000 and 5,000,000 g / mol are high molecular weight hyaluronic acid.

[0042] Alternatively, the hyaluronic acid portion of the present invention may also be selected from those with a weight-average molecular weight between 50,000 and 400,000 g / mol (medium molecular weight hyaluronic acid) and those with a weight-average molecular weight less than 50,000 g / mol (low molecular weight hyaluronic acid).

[0043] In the context of this invention, the term "hyaluronic acid and its derivatives" also includes hyaluronic acid salts, particularly alkali metal salts such as sodium and potassium salts.

[0044] Finally, the term "hyaluronic acid and its derivatives" also includes hyaluronic acid esters, particularly those in which all or some of the carboxyl groups of the acidic function are esterified by an oxyethylene alkyl or alcohol containing 1 to 20 carbon atoms, especially with a degree of substitution of 0.5 to 50% at the D-glucuronic acid level of hyaluronic acid. Methyl, ethyl, n-propyl, n-pentyl, benzyl, and dodecyl esters of hyaluronic acid may be specifically mentioned.

[0045] The above molecular weight also applies to hyaluronic acid esters.

[0046] More preferably, the glycosaminoglycan is selected from hyaluronic acid salts.

[0047] More preferably, the glycosaminoglycan is selected from sodium hyaluronate, potassium hyaluronate, and combinations thereof.

[0048] Advantageously, glycosaminoglycans are loaded onto the mask sheet of the mask of the present invention in an amount of 0.1% to 10% by weight, preferably 0.1% to 5% by weight, more preferably 0.2% to 3% by weight, more preferably 0.4% to 2% by weight, and even more preferably 0.6% to 1.8% by weight relative to the total weight of the mask sheet.

[0049] nonionic polysaccharides The composition of the facial mask of the present invention contains at least one nonionic polysaccharide selected from homopolymers of mannose, copolymers of mannose and glucose, copolymers of mannose and galactose, and combinations thereof.

[0050] Preferably, homopolymer refers to a polymer with a degree of polymerization between 2 and 6.

[0051] Preferably, the copolymer represents a polymer with a number average molecular weight of 10,000-2,000,000 g / mol, more preferably 20,000-1,000,000 g / mol, and even more preferably 50,000-500,000 g / mol.

[0052] Preferably, the nonionic polysaccharide is selected from mannan, glucomannan, galactomannan, and combinations thereof.

[0053] Gum containing mannan, glucomannan, galactomannan or combinations thereof can also be used as nonionic polysaccharides in the compositions of the present invention.

[0054] Therefore, preferably, the nonionic polysaccharide is selected from mannan, glucomannan, galactomannan, konjac gum, Bletilla gum, guar gum, fenugreek gum, guar gum, locust bean gum, cinnamon gum and combinations thereof.

[0055] More preferably, the nonionic polysaccharide is selected from mannan, glucomannan, galactomannan and combinations thereof.

[0056] Examples of commercial products that can be used in compositions according to the invention include the product sold by XieLi under the name KONJAC GEL CKAA1220 and the product sold by BLG under the name KONJAC FLOURHWG1002.

[0057] Advantageously, the nonionic polysaccharide is present in the composition of the mask of the present invention in an amount of 0.01% to 10% by weight, preferably 0.02% to 6% by weight, more preferably 0.05% to 1.5% by weight, even more preferably 0.1% to 0.8% by weight, and most preferably 0.15% to 0.5% by weight, relative to the total weight of the composition.

[0058] Water-soluble alkali metal salts The composition of the face mask according to the present invention contains at least one water-soluble alkali metal salt. The water-soluble alkali metal salts that can be used in this invention include all kinds of alkali metals (e.g., Li, Na, K, etc.) that form soluble salts (chlorides, nitrates, etc.) acceptable in the cosmetics field.

[0059] Water-soluble alkali metal salts can be selected from water-soluble alkali metal salts of inorganic acids and / or organic acids. Water-soluble alkali metal salts of inorganic acids can be, for example, alkali metal chlorides, alkali metal nitrates, alkali metal sulfates, alkali metal carbonates, alkali metal bicarbonates, alkali metal phosphates, etc. Water-soluble alkali metal salts of organic acids can be, for example, alkali metal salts of EDTA, alkali metal salts of carboxylic acids, alkali metal salts of lactic acid, alkali metal salts of acetic acid, alkali metal salts of formic acid, alkali metal salts of uric acid, alkali metal salts of malic acid, alkali metal salts of tartaric acid, alkali metal citrates, etc.

[0060] Preferably, the alkali metal is selected from Li, Na, and K.

[0061] Preferably, the water-soluble alkali metal salt is selected from disodium ethylenediaminetetraacetate, sodium citrate, potassium citrate, and combinations thereof.

[0062] Advantageously, the water-soluble alkali metal salt is present in the composition of the mask of the present invention in an amount of 0.1% to 15% by weight, preferably 0.2% to 10% by weight, more preferably 0.3% to 8% by weight, even more preferably 0.5% to 5% by weight, and most preferably 0.5% to 3% by weight, relative to the total weight of the composition.

[0063] A water-soluble alkali metal salt, preferably sodium citrate, undergoes ion exchange with a water-insoluble polyvalent metal salt, preferably calcium alginate (which associates with glycosaminoglycans, especially sodium hyaluronate), which gives the exudate from the composition a suitable application viscosity and keeps it stable at high temperatures such as 45°C.

[0064] Ionic polysaccharides Preferably, the composition in the mask according to the invention comprises ionic polysaccharides.

[0065] In this invention, the term "ionic polysaccharide" should be understood as a polysaccharide in which the number of monosaccharide units contains at least one ionic group.

[0066] Preferably, the ionic polysaccharide is selected from xanthan gum, carrageenan, gellan gum, digoxin, velan gum, and combinations thereof.

[0067] Xanthan gum is produced by bacteria. Xanthomonas campestrisXanthan gum is a heteropolysaccharide produced by aerobic fermentation. Similar to cellulose, its structure consists of a backbone of β(1,4)-linked β-D-glucose. One of the two glucose molecules carries a trisaccharide side chain consisting of α-D-mannose, β-D-glucuronic acid, and terminal β-D-mannose. The internal mannose residues are typically acetylated at carbon 6. Approximately 30% of the terminal mannose residues carry pyruvate groups chelated between carbons 4 and 6. The charged pyruvate and glucuronic acid are ionizable, thus explaining the anionic nature of xanthan gum (negative charge down to pH 1). These groups may be present in commercial products using Na+. + K + or Ca 2+ Ion neutralization (Satia, 1986). The neutralized form can be converted to the acidic form through ion exchange or dialysis of an acidic solution.

[0068] Carrageenan is selected from carrageenan of the μ, κ, v, τ, or λ type, and mixtures thereof in all proportions, preferably of the κ type. The carrageenan of the present invention can be used in acidic or salt-forming form. Acceptable salts that may be mentioned in a non-limiting manner include lithium, sodium, potassium, calcium, zinc, and ammonium salts, or salts obtained with an organic base counterion, such as primary, secondary, or tertiary (C1-C6) alkylamines, especially salts obtained with triethylamine or butylamine. Such primary, secondary, or tertiary alkylamines may contain one or more nitrogen and / or oxygen atoms, and therefore may contain, for example, one or more alcohol functionalities; amino-2-methyl-2-propanol, triethanolamine, and dimethylamino-2-propanol are particularly mentioned. Lysine or 3-(dimethylamino)propylamine may also be mentioned. These sulfated polysaccharides may also contain mixtures of counterions from those defined above in a non-limiting manner.

[0069] Preferably, the carrageenan used in this invention has a weight-average molecular weight of 300-100,000,000 g / mol, more preferably 10,000-10,000,000 g / mol.

[0070] Sulfur content of carrageenan (as SO4) 2- The percentage (by weight) is preferably between 5% and 40% (relative to the total weight of carrageenan), more preferably between 7% and 25%, and even more preferably between 15% and 20%.

[0071] Preferably, carrageenan comprises primarily the κ form or is in the κ form. The term "primarily" means that the percentage of this type of chain in the composition of the product is greater than or equal to 50%, and in some embodiments may be greater than or equal to 80%. Such carrageenan may be the kind sold by BLG under the name CARRAGEENAN BLK1120.

[0072] Gellan gum has a repeating tetrasaccharide structure composed of (glucose-glucuronic acid-glucose-rhamnose) units.

[0073] The partial structure of gellan gum is as follows: -4)-L-Rhap-(α-1-3)-D-Glcp-(β-1-4)-D-GlcpA-(β-1-4)-D-Glcp-(β-1-.

[0074] Desmooth gum is a biogel produced by fermentation of bacteria from the genus *Sphingomonas*, for example, the *Sphingomonas* strain deposited in the American Type Culture Collection (ATCC) with accession number ATCC 53159. More specifically, desmooth gum is an extracellular polysaccharide obtained by fermentation of carbohydrates by bacteria from the genus *Sphingomonas*, particularly the *Sphingomonas* strain with accession number ATCC 53159. Desmooth gum typically exhibits a hexameric repeating unit consisting of four sugars in the main chain (glucose-glucuronic acid-glucose-rhamnose) and two rhamnose residues as side chains linked to one of the glucose residues. A non-limiting example of commercially available desmooth gum is Kelcocare™ desmooth gum from CP Kelco. Desmooth gum is also commonly referred to as S-657 polysaccharide.

[0075] Vilan gum is a bio-gum produced by fermentation of bacteria from the genera *Alcaligenes* or *Sphingomonas*. More specifically, vilan gum is an extracellular polysaccharide obtained by fermentation of carbohydrates by bacteria from the genera *Alcaligenes* or *Sphingomonas*. Vilan gum is a polymer having a repeating tetrasaccharide backbone containing L-mannose, L-rhamnose, D-glucose, and D-glucuronic acid. In one particular embodiment, vilan gum is obtained by fermentation of carbohydrates by bacteria from the genera *Sphingomonas*.

[0076] Preferably, the composition according to the invention comprises at least one ionic polysaccharide selected from xanthan gum, carrageenan, and combinations thereof.

[0077] As an example of a commercially available product that can be used in the compositions according to the present invention, reference can be made to the product sold by CPKELCO under the name KELTROL CG-T.

[0078] In some preferred embodiments, carrageenan is present as carrageenan powder.

[0079] Advantageously, the ionic polysaccharide is present in the composition of the mask of the present invention in an amount of 0.01% to 15% by weight, preferably 0.02% to 8% by weight, more preferably 0.05% to 4% by weight, even more preferably 0.1% to 1.5% by weight, and most preferably 0.15% to 1% by weight, relative to the total weight of the composition.

[0080] Preferably, the composition comprises 0.05% to 0.5% by weight of carrageenan and 0.1% to 1% by weight of xanthan gum relative to the total weight of the composition.

[0081] Preferably, the total amount of ionic and nonionic polysaccharides in the composition of the present invention is 0.05% to 20% by weight, more preferably 0.08% to 10% by weight, more preferably 0.1% to 5% by weight, more preferably 0.15% to 2% by weight, and even more preferably 0.3% to 1.5% by weight, relative to the total weight of the composition.

[0082] β-hydroxy acids and their derivatives For the purposes of this invention, preferably, the composition according to the invention further comprises at least one compound A selected from β-hydroxy acids and their derivatives.

[0083] Compound A is included in the composition to provide antibacterial, anti-inflammatory and / or hydrating properties.

[0084] According to the present invention, the term "β-hydroxy acid" is understood to refer to a carboxylic acid having a hydroxyl functional group and a carboxyl functional group separated by two carbon atoms.

[0085] In the context of this invention, the term "β-hydroxy acid and its derivatives" includes β-hydroxy acids and β-hydroxy acid salts, particularly alkali metal salts such as sodium and potassium salts.

[0086] Preferably, the β-hydroxy acid and its derivatives are selected from salicylic acid and its derivatives of formula (I): (I) in M is selected from hydrogen, sodium, and potassium; R is hydrogen or a C6-C18 acyl group.

[0087] Preferably, in formula (I), M is selected from hydrogen, sodium, and potassium, and R is hydrogen or a straight-chain C6-C16 acyl group.

[0088] More preferably, compound A is selected from salicylic acid, sodium salicylate, potassium salicylate, 5-octanoyl salicylic acid, 5-decanoyl salicylic acid, 5-dodecanoyl salicylic acid and combinations thereof.

[0089] More preferably, compound A is selected from salicylic acid, sodium salicylate, potassium salicylate, and combinations thereof.

[0090] Most preferably, the composition according to the invention comprises salicylic acid.

[0091] Advantageously, compound A is present in an amount of 0.01% to 10% by weight, preferably 0.01% to 5% by weight, preferably 0.03% to 2% by weight, more preferably 0.05% to 1% by weight, and even more preferably 0.08% to 0.5% by weight, relative to the total weight of the composition.

[0092] Aqueous phase The compositions of the present invention may contain an aqueous phase.

[0093] Preferably, the aqueous phase contains water.

[0094] Advantageously, water is present in the composition of the invention in an amount of 60% to 99% by weight, preferably 65% ​​to 95% by weight, relative to the total weight of the composition.

[0095] Optionally, the aqueous phase comprises (at room temperature 25°C) an organic solvent miscible with water, selected from ethanol and polyols having 2 to 20 carbon atoms, preferably 2 to 10 carbon atoms, and more preferably 2 to 6 carbon atoms, such as glycerol, propylene glycol, butylene glycol, pentanediol, hexanediol, dipropylene glycol, diethylene glycol; and combinations thereof.

[0096] Preferably, the composition comprises an organic solvent selected from glycerol, 1,3-propanediol, and combinations thereof.

[0097] Preferably, the organic solvent is present in an amount of 0.5% to 30% by weight, more preferably 1% to 20% by weight, relative to the total weight of the composition.

[0098] Preferably, the composition contains 0.5% to 20% by weight, more preferably 1% to 10% by weight, of 1,3-propanediol relative to the total weight of the composition.

[0099] Preferably, the composition contains 0.5% to 30% by weight, more preferably 1% to 20% by weight, of glycerol relative to the total weight of the composition.

[0100] Advantageously, the aqueous phase is present in the composition of the invention in an amount of 60% to 99.5% by weight, preferably 65% ​​to 99% by weight, relative to the total weight of the composition.

[0101] Cosmetic active ingredients Depending on the ultimate purpose, the compositions according to the present invention may contain one or more cosmetic active ingredients.

[0102] Adjusting the amount of additional cosmetic active ingredients based on the end use of the composition according to the invention is readily apparent to those skilled in the art.

[0103] Additional adjuvants or additives The compositions of the present invention may contain conventional cosmetic adjuvants or additives, such as fragrances, preservatives and bactericides, pH adjusters, and combinations thereof.

[0104] Those skilled in the art can select the amount of additional adjuvants or additives so as not to adversely affect the final use of the composition according to the invention.

[0105] According to a preferred embodiment, the present invention provides a facial mask preferably used for caring for keratin materials, comprising: A) A facial mask sheet comprising, by weight 8% to 18% relative to the total weight of the mask sheet, at least one water-insoluble polyvalent metal salt selected from alginate, and loaded with, by weight 0.6% to 1.8% relative to the total weight of the mask sheet, at least one hyaluronic acid salt, and B) The composition on the mask sheet, preferably in the form of a hydrogel, comprises, relative to the total weight of the composition: a) 0.15% to 0.5% by weight of at least one nonionic polysaccharide selected from mannan, glucomannan, galactomannan, and combinations thereof; b) 0.5% to 3% by weight of at least one water-soluble alkali metal salt selected from disodium ethylenediaminetetraacetate, sodium citrate, potassium citrate, and combinations thereof; and c) 0.15% to 1% by weight of at least one ionic polysaccharide selected from xanthan gum, carrageenan, and combinations thereof.

[0106] Galen form The mask comprises a composition capable of forming a hydrogel and a mask sheet containing a water-insoluble polyvalent metal salt and loaded with glycosaminoglycans.

[0107] Those skilled in the art can select a suitable mask sheet and the weight ratio of the mask sheet to the composition according to the present invention based on the properties of the composition.

[0108] Preferably, the weight ratio of the mask sheet to the composition is from 1:0.1 to 1:60. More preferably, the weight ratio of the mask sheet to the composition is from 1:0.5 to 1:45. Even more preferably, the weight ratio of the mask sheet to the composition is from 1:0.8 to 1:35.

[0109] Uses and methods The facial mask according to the invention is intended for topical application, and is particularly suitable for treating keratin materials, especially the skin.

[0110] In particular, the compositions according to the invention can be used for the care of keratin materials, especially skin.

[0111] According to a third aspect, the present invention provides a non-therapeutic method for caring for keratin materials, particularly skin, comprising applying a mask as defined above onto the keratin material.

[0112] In particular, keratin materials are used on facial skin and / or eye area skin.

[0113] Preferably, the present invention provides a non-therapeutic method for caring for keratin materials, particularly skin, comprising: The mask according to the invention is applied to a keratin material; Allow the mask to remain on the keratin material for a period of time; and Remove the mask from the keratin material. Example

[0114] The invention is illustrated in more detail by way of the following embodiments given as non-limiting description.

[0115] The main raw materials used, their product names, and their suppliers are listed in Table 1.

[0116] Table 1 .

[0117] Examples 1-3 and Comparative Examples 1-4 of the present invention The masks of Examples (IE.) 1-3 and Comparative Examples (CE.) 1-4 of the present invention were prepared using compositions containing the ingredients listed in Table 2 (unless otherwise stated, the content is expressed as a weight percentage of each ingredient relative to the total weight of each composition) and mask sheets containing the ingredients listed in Table 2 (the content is expressed as a weight percentage relative to the total weight of each sheet): Table 2 Sodium hyaluronate*: Loaded onto a mask sheet made of calcium alginate fiber and cellulose fiber, in an amount relative to the total weight of the calcium alginate fiber and cellulose fiber.

[0118] The face masks obtained in Examples 1-3 of this invention represent face masks according to the present invention.

[0119] The mask of Comparative Example 1 does not contain a) at least one nonionic polysaccharide selected from homopolymers of mannose, copolymers of mannose and glucose, copolymers of mannose and galactose, and combinations thereof, and does not contain at least one glycosaminoglycan loaded on the mask sheet.

[0120] The mask of Comparative Example 2 does not contain b) at least one water-soluble alkali metal salt in the composition.

[0121] The mask in Comparative Example 3 does not contain at least one glycosaminoglycan loaded on the mask sheet.

[0122] The mask in Comparative Example 4 does not contain a) at least one nonionic polysaccharide selected from homopolymers of mannose, copolymers of mannose and glucose, copolymers of mannose and galactose, and combinations thereof.

[0123] Preparation of the composition: Each composition of Examples 1-3 and Comparative Examples 1-4 of the present invention was prepared as follows: 1) In the main vessel, salicylic acid, sodium citrate (if present), sodium hyaluronate (if present) and 1,3-propanediol are introduced into water at 80°C and dissolved completely. 2) Carrageenan (if present), xanthan gum (if present) and glucomannan (if present) are mixed in glycerol at 80°C to obtain mixture A. Then, mixture A or glycerol (and) glyceryl acrylate / acrylic acid copolymer (and) PVM / MA copolymer is introduced into the master reactor under stirring to obtain mixture B. 3) Heat mixture B at 80°C for 30 minutes, then cool to room temperature.

[0124] Treatment of facial mask sheets: At least one glycosaminoglycan is loaded onto each mask sheet of Examples 1-3 and Comparative Examples 2 and 4 of the present invention as follows: 1) Weigh the sodium hyaluronate and add it to the water at room temperature (RT, 25°C) with stirring until fully dissolved to obtain a mixture; 2) The mixture is sprayed onto a facial mask sheet made of calcium alginate fiber and cellulose fiber using a sprayer; 3) Place the mask sheet loaded with the mixture in an oven at 80°C for 1 hour to evaporate the water.

[0125] Preparation of face masks: Weigh 30g of each composition of Examples 1-3 and Comparative Examples 1-4 of the present invention, and apply it accordingly onto 1g of the mask paper of Examples 1-3 and Comparative Examples 1-4 of the present invention using a coating machine to obtain a mask.

[0126] Evaluate: Appearance The appearance of the compositions of the face masks used in Examples 1-3 and Comparative Examples 1-4 of the present invention was observed with the naked eye at room temperature (RT, 25°C).

[0127] Viscosity The face masks of Examples 1-3 and Comparative Examples 1-4 of the present invention were stored in small bags at 45°C for 2 months.

[0128] After the face masks of Examples 1-3 and Comparative Examples 1-4 of this invention have been stored at 45°C for 2 months, the exudate of each composition contained in the face mask was poured out and analyzed using an MCR 301 rheometer equipped with a PP25 rotor for 50 seconds. -1 Its viscosity was determined at a shear rate of .

[0129] A viscosity of 50 mPa·s to 350 mPa·s is considered reasonable, which means that the mask is stable.

[0130] The appearance of each composition at room temperature and the viscosity of the exudate contained in the masks of Examples 1-3 and Comparative Examples 1-4 of the present invention after two months of storage at 45°C are summarized in Table 3.

[0131] Table 3 NA: Not determined because the composition is a viscous fluid.

[0132] As can be seen from Table 3, each composition in the masks of Examples 1-3 of the present invention is a hydrogel, and the exudate from each composition contained therein has a suitable application viscosity, which means that each mask of Examples 1-3 of the present invention has good stability at high temperatures such as 45°C.

Claims

1. A facial mask, preferably for treating keratin materials, comprising: A) A facial mask sheet containing at least one water-insoluble polyvalent metal salt, loaded with at least one glycosaminoglycan. B) The composition on the mask sheet, comprising: a) At least one nonionic polysaccharide selected from homopolymers of mannose, copolymers of mannose and glucose, copolymers of mannose and galactose, and combinations thereof; and b) At least one water-soluble alkali metal salt.

2. The facial mask according to claim 1, wherein the water-insoluble polyvalent metal salt is selected from alginate; preferably, the water-insoluble polyvalent metal salt is selected from calcium alginate, strontium alginate, zinc alginate, copper alginate, manganese alginate or a combination thereof; more preferably, the water-insoluble polyvalent metal salt is calcium alginate.

3. The face mask according to claim 1 or 2, wherein the face mask sheet contains 0.5% to 30% by weight, preferably 2% to 25% by weight, more preferably 5% to 20% by weight, and even more preferably 8% to 18% by weight of the water-insoluble polyvalent metal salt relative to the total weight of the face mask sheet.

4. The face mask according to any one of claims 1 to 3, wherein the glycosaminoglycan is selected from hyaluronic acid and its derivatives, preferably from hyaluronic acid salts, more preferably from sodium hyaluronate, potassium hyaluronate and combinations thereof.

5. The face mask according to any one of claims 1 to 4, wherein the glycosaminoglycan is loaded onto the face mask paper in an amount of 0.1% to 10% by weight, preferably 0.1% to 5% by weight, more preferably 0.2% to 3% by weight, more preferably 0.4% to 2% by weight, and even more preferably 0.6% to 1.8% by weight relative to the total weight of the face mask paper.

6. The facial mask according to any one of claims 1 to 5, wherein the nonionic polysaccharide is selected from mannan, glucomannan, galactomannan, konjac gum, Bletilla striata gum, guar gum, fenugreek gum, guar gum, locust bean gum, cinnamon gum, and combinations thereof; more preferably, the nonionic polysaccharide is selected from mannan, glucomannan, galactomannan, and combinations thereof.

7. The face mask according to any one of claims 1 to 6, wherein the nonionic polysaccharide is present in an amount of 0.01% to 10% by weight, preferably 0.02% to 6% by weight, more preferably 0.05% to 1.5% by weight, even more preferably 0.1% to 0.8% by weight, and most preferably 0.15% to 0.5% by weight, relative to the total weight of the composition.

8. The face mask according to any one of claims 1 to 7, wherein the water-soluble alkali metal salt is selected from disodium ethylenediaminetetraacetate, sodium citrate, potassium citrate, and combinations thereof.

9. The face mask according to any one of claims 1 to 8, wherein the water-soluble alkali metal salt is present in an amount of 0.1% to 15% by weight, preferably 0.2% to 10% by weight, more preferably 0.3% to 8% by weight, even more preferably 0.5% to 5% by weight, and most preferably 0.5% to 3% by weight, relative to the total weight of the composition.

10. The facial mask according to any one of claims 1 to 9, wherein the composition further comprises an ionic polysaccharide, preferably selected from xanthan gum, carrageenan, gellan gum, dioxin, veslan gum, and combinations thereof, preferably selected from xanthan gum, carrageenan, and combinations thereof, preferably, the ionic polysaccharide is present in an amount of 0.01% to 15% by weight, preferably 0.02% to 8% by weight, more preferably 0.05% to 4% by weight, even more preferably 0.1% to 1.5% by weight, and most preferably 0.15% to 1% by weight, relative to the total weight of the composition.

11. The face mask according to claim 10, wherein the total amount of ionic and nonionic polysaccharides in the composition is from 0.05% to 20% by weight, preferably from 0.08% to 10% by weight, more preferably from 0.1% to 5% by weight, more preferably from 0.15% to 2% by weight, and even more preferably from 0.3% to 1.5% by weight, relative to the total weight of the composition.

12. The facial mask according to any one of claims 1 to 11, wherein the composition further comprises at least one compound A selected from β-hydroxy acids and their derivatives; preferably selected from salicylic acid, sodium salicylate, potassium salicylate, 5-octanoyl salicylic acid, 5-decanoyl salicylic acid, 5-dodecanoyl salicylic acid and combinations thereof, preferably, the compound A is present in an amount of 0.01% to 10% by weight, preferably 0.01% to 5% by weight, preferably 0.03% to 2% by weight, more preferably 0.05% to 1% by weight, and even more preferably 0.08% to 0.5% by weight, relative to the total weight of the composition.

13. The facial mask according to claim 1, comprising: A) A facial mask sheet comprising, by weight 8% to 18% relative to the total weight of the mask sheet, at least one water-insoluble polyvalent metal salt selected from alginate, and loaded with, by weight 0.6% to 1.8% relative to the total weight of the mask sheet, at least one hyaluronic acid salt, and B) The composition on the mask sheet, preferably in the form of a hydrogel, comprises, relative to the total weight of the composition: a) 0.15% to 0.5% by weight of at least one nonionic polysaccharide selected from mannan, glucomannan, galactomannan, and combinations thereof; b) 0.5% to 3% by weight of at least one water-soluble alkali metal salt selected from disodium ethylenediaminetetraacetate, sodium citrate, potassium citrate, and combinations thereof; and c) 0.15% to 1% by weight of at least one ionic polysaccharide selected from xanthan gum, carrageenan, and combinations thereof.

14. The facial mask according to any one of claims 1 to 13, wherein the composition further comprises water, preferably, in an amount of 60% to 99% by weight, more preferably 65% ​​to 95% by weight, relative to the total weight of the composition. and / or The composition further comprises one or more water-miscible organic solvents, preferably selected from ethanol, polyols having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, more preferably 2 to 6 carbon atoms, and combinations thereof, more preferably selected from glycerol, propylene glycol, butylene glycol, pentanediol, hexanediol, dipropylene glycol, diethylene glycol, and combinations thereof. Preferably, the water-miscible organic solvent is present in an amount of 0.5% to 30% by weight, preferably 1% to 20% by weight, relative to the total weight of the composition.

15. A non-therapeutic method for caring for a keratin material, comprising applying a mask according to any one of claims 1 to 14 onto the keratin material.

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