Composition for caring for keratinous materials and mask containing same

Abstract

A composition for caring for keratinous materials comprises (i) at least one neutralized polyacrylic acid, (ii) at least one polymer comprising at least one monomer of 2-acrylamido-2-methylpropanesulfonic acid, (iii) at least one polyoxybutylene polyoxyethylene polyoxypropylene glycerol, and (iv) at least one C2-C4 polyol, wherein the composition does not contain more than 1% of a diol containing 5 or more carbon atoms and a preservative. A non-therapeutic method for caring for keratinous materials comprises applying the composition to keratinous materials.

Description

[Technical Field]

[0001] The present invention relates to a composition for caring for keratinous materials and to a mask containing same.The present invention also relates to a non-therapeutic method for caring for keratinous materials. [Background technology]

[0002] Skin is a protective barrier for the human body. It protects the interior of the body from physical injury (e.g., trauma) and biological injury (e.g., bacteria, viruses, or fungi). The epidermis is a keratinized stratified pavimentous epithelium. Its average thickness ranges from 60 to 100 μm and can reach 600 to 700 μm on the soles and palms. It is composed primarily of keratinocytes, but also of other cells, and lies on a basement membrane that separates it from the dermis.

[0003] During menopause, the skin undergoes changes in all its compartments, namely the dermal and epidermal compartments. The development of formulations dedicated to the care of the skin is never-ending.

[0004] Delivering a highly effective product with cosmetic properties such as hydration, moisturization and whitening to the consumer has always been the ultimate goal of cosmetic formulations.

[0005] Among all compositions for skin care, masks are known to have high effectiveness on the skin, which has resulted in an expansion of the market for mask cosmetics.

[0006] Conventionally, masks are divided into three main categories: tissue masks, which are the primary and most developed category; tissue-free leave-on masks, e.g., sleeping masks used at night; and tissue-free rinse-off masks, e.g., clay masks that cleanse the skin.

[0007] Efforts are being made to formulate mask compositions for skin care that have a gentle skin feel after application, particularly by reducing the amount of preservatives to obtain gentle cosmetic mask products.

[0008] For this purpose, a sterilization procedure was carried out during the preparation of such compositions, and conventional sterilization treatments, such as heat sterilization, may be mentioned.

[0009] However, many cosmetic compositions cannot withstand heat sterilization.For example, the composition containing diols containing 5 or more carbon atoms can provide stability and good sensory sensation after sterilization, but on the other hand, there is a bad smell caused by sterilization at high temperature. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] FR2785801 [Patent Document 2] WO2020001069A Summary of the Invention [Problem to be solved by the invention]

[0011] Therefore, there remains a need to formulate compositions for caring for the skin that are stable, can provide good sensory feedback to the skin, and do not have a malodor after heat sterilization. [Means for solving the problem]

[0012] We have now discovered that it is possible to formulate compositions for caring for the skin that are stable, can provide good sensory feedback to the skin, and do not have a malodor after heat sterilization.

[0013] Thus, in a first aspect, the present invention provides a composition for caring for keratinous materials, comprising: (i) at least one salt of polyacrylic acid; (ii) at least one polymer comprising at least one monomer of 2-acrylamido-2-methylpropanesulfonic acid; (iii) at least one polyoxybutylene polyoxyethylene polyoxypropylene glycerol; (iv) at least one C2-C4 polyol; Including, Contains no more than 1% of diols containing 5 or more carbon atoms and preservatives; A composition is provided.

[0014] The compositions according to the present invention are stable and can provide good sensory results without malodour after heat sterilisation.

[0015] In a second aspect, the invention relates to a mask for caring for keratinous materials, comprising: A) a water-insoluble mask tissue; B) a composition according to the present invention impregnated into a mask tissue; To provide a mask comprising:

[0016] The composition or mask of the present invention can provide a hydrating benefit to the skin.

[0017] In a third aspect, the present invention provides a non-therapeutic method for caring for keratinous materials, comprising the step of applying a composition according to the present invention to the keratinous materials.

[0018] In a fourth aspect, the present invention provides a non-therapeutic method for caring for keratinous materials, comprising: (i) applying a mask according to the invention to keratinous materials; (ii) leaving the mask on the keratinous material for a period of time; (iii) removing the mask from the keratinous material; The present invention provides a non-therapeutic method comprising:

[0019] Other advantages of the present invention will become more apparent on reading the following description and examples. DETAILED DESCRIPTION OF THE INVENTION

[0020] 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 belongs. In the event that a definition of a term in this description conflicts with a meaning commonly understood by one of ordinary skill in the art to which this invention belongs, the definition set forth herein shall apply.

[0021] In the following description, unless otherwise indicated, the limits of ranges of values ​​are included within the range, particularly in expressions such as "between ... and ..." and "to ...".

[0022] Furthermore, the phrase "at least one" as used in this description is equivalent to the phrase "one or more."

[0023] Throughout this application, the term "comprising" should be interpreted to encompass all specifically mentioned features as well as optional, additional, unspecified features. As used herein, use of the term "comprising" also discloses embodiments in which no features are present other than those specifically mentioned (i.e., "consisting of").

[0024] Unless otherwise specified, all numerical values ​​expressing quantities of ingredients and the like used in the present description and claims should be understood to be modified by the term "about." Accordingly, unless indicated to the contrary, the numerical values ​​and parameters set forth herein are approximations that can be modified as necessary according to desired objectives.

[0025] For the purposes of the present invention, the term "keratinous material" is intended to encompass human skin. Facial skin is particularly considered by the present invention.

[0026] All percentages in this invention refer to weight percentages unless otherwise specified.

[0027] Salts of polyacrylic acid According to a first embodiment, the composition of the invention comprises at least one salt of polyacrylic acid.

[0028] Suitable salts of polyacrylic acid for use in the present invention include, but are not limited to, metal salts of polyacrylic acid.

[0029] The salts of polyacrylic acid may be partially or fully neutralized.

[0030] The acrylic monomers of the salts of polyacrylic acid according to the invention may be neutralized to a degree of 90% to 100%.

[0031] Examples include sodium, potassium, lithium and ammonium salts of polyacrylic acid.

[0032] The most preferred salt of polyacrylic acid is sodium polyacrylate.

[0033] Sodium polyacrylate is an acrylic homopolymer in partially or fully neutralized form and is hydrophilic.

[0034] According to the present invention, the term "hydrophilic polymer" means a non-amphiphilic polymer that is soluble and dispersible in water.

[0035] In one preferred embodiment, the polyacrylate is sodium polyacrylate designated by CAS number 9003-04-7, for example, as sold by Sigma-Aldrich or COSMEDIA SP sold by BASF.

[0036] Sodium polyacrylate sold under the name Cosmedia SP® contains 90% solids and 10% water.

[0037] Advantageously, the salt of polyacrylic acid is present in the composition according to the invention in an amount ranging from 0.01% to 5% by weight, preferably from 0.1% to 2% by weight, and more preferably from 0.2% to 0.5% by weight relative to the total weight of the composition.

[0038] Advantageously, the salt of polyacrylic acid is present in the composition according to the invention in an amount greater than or equal to 0.1% by weight, preferably greater than or equal to 0.3% by weight, relative to the total weight of the composition.

[0039] polymer According to a first aspect, the composition of the present invention comprises at least one polymer (i.e., an AMPS® polymer) comprising at least one monomer that is acrylamido-2-methylpropanesulfonic acid (AMPS®).

[0040] In particular, the AMPS® polymer according to the present invention may be a crosslinked or non-crosslinked homopolymer or copolymer comprising at least acrylamido-2-methylpropanesulfonic acid (AMPS®) monomer in a form that has been partially or fully neutralized with an inorganic base other than ammonia, such as sodium hydroxide or potassium hydroxide.

[0041] These are preferably completely neutralized or virtually completely neutralized, ie at least 90% neutralized.

[0042] These AMPS® polymers according to the present invention may be crosslinked or non-crosslinked.

[0043] When the polymer is crosslinked, the crosslinking agent can be selected from polyolefinically unsaturated compounds that are commonly used for crosslinking polymers obtained by free radical polymerization.Examples of crosslinking agents that can be mentioned include divinylbenzene, diallyl ether, dipropylene glycol diallyl ether, polyglycol diallyl ether, triethylene glycol divinyl ether, hydroquinone diallyl ether, ethylene glycol di(meth)acrylate or tetraethylene glycol di(meth)acrylate, trimethylolpropane triacrylate, methylenebisacrylamide, methylenebismethacrylamide, triallylamine, triallyl cyanurate, diallyl maleate, tetraallylethylenediamine, tetraallyloxyethane, trimethylolpropane diallyl ether, allyl (meth)acrylate, the allyl ether of sugar alcohols or the allyl ether or vinyl ether of other polyfunctional alcohols, and the allyl ester of phosphoric acid derivatives and / or vinylphosphonic acid derivatives, or a mixture of these compounds.

[0044] According to one embodiment of the present invention, the crosslinking agent is selected from methylenebisacrylamide, allyl methacrylate and trimethylolpropane triacrylate (TMPTA), and the degree of crosslinking is generally in the range of 0.01 mol % to 10 mol %, in particular 0.2 mol % to 2 mol %, based on the polymer.

[0045] The AMPS® polymers according to the present invention are water-soluble or water-dispersible. - "homopolymers" which contain only AMPS® monomers and, if they are crosslinked, one or more crosslinkers, such as those defined above; or copolymers obtained from AMPS® and one or more hydrophilic or hydrophobic ethylenically unsaturated monomers and, if these are crosslinked, one or more crosslinkers, such as those defined above. If the copolymer contains hydrophobic ethylenically unsaturated monomers, these monomers do not contain fatty chains and are preferably present in small amounts.

[0046] For the purposes of the present invention, the term "fatty chain" means any hydrocarbon-based chain containing at least 7 carbon atoms.

[0047] The term "water-soluble or water-dispersible" means a polymer which, when introduced into an aqueous phase at 25°C in a concentration by mass equal to 1%, is capable of obtaining a macroscopically homogeneous and transparent solution, i.e. a solution having a maximum light transmittance value of at least 60%, preferably at least 70%, through a sample of 1 cm thickness at a wavelength equal to 500 nm.

[0048] The "homopolymers" according to the present invention are preferably crosslinked and neutralized, and are prepared by the following steps: (a) dispersing or dissolving a free form monomer, such as AMPS®, in a solution of tert-butanol or a solution of water and tert-butanol; (b) neutralizing the solution or dispersion of the monomers obtained in (a) with one or more inorganic or organic bases, preferably ammonia NH3, in an amount sufficient to obtain a degree of neutralization of the sulfonic acid functional groups of the polymer ranging from 90% to 100%; (c) adding a crosslinking monomer to the solution or dispersion obtained in (b); (d) carrying out standard free radical polymerization in the presence of a free radical initiator at a temperature in the range of 10-150°C to precipitate the polymer into a tert-butanol-based solution or dispersion; It can be obtained according to a preparation method including:

[0049] The AMPS® homopolymer according to the invention is preferably an optionally crosslinked and / or neutralized 2-acrylamido-2-methylpropanesulfonic acid homopolymer, such as poly(2-acrylamido-2-methylpropanesulfonic acid) sold under the name Hostacerin AMPS® (CTFA name: Ammonium Polyacryldimethyltauramide) by Clariant.

[0050] The water-soluble or water-dispersible AMPS copolymers according to the present invention preferably contain water-soluble ethylenically unsaturated monomers, hydrophobic monomers, or mixtures thereof.

[0051] The water-soluble comonomers may be ionic or non-ionic.

[0052] Among the ionic water-soluble comonomers, examples that may be mentioned include the following compounds and their salts: (meth)acrylic acid, - styrene sulfonic acid, vinyl sulfonic acid and (meth)allylsulfonic acid, vinylphosphonic acid, - maleic acid, - itaconic acid, - crotonic acid, - Formula (A) below:

[0053] [ka]

[0054] (In the formula, R1 is selected from H, —CH3, —C2H5 and —C3H7; - X1 - -OR2 type (wherein R2 is a linear or branched, saturated or unsaturated hydrocarbon-based group containing 1 to 6 carbon atoms, substituted with at least one alkyl ether of sulfonic acid group (-SO3-) and / or sulfate group (-SO4-) and / or phosphate group (-PO4H2-)) A water-soluble vinyl monomer.

[0055] Among the non-ionic water-soluble comonomers, examples that may be mentioned include: (meth)acrylamide, N-vinylacetamide and N-methyl N-vinylacetamide, N-vinylformamide and N-methyl N-vinylformamide, - maleic anhydride, - vinylamine, - N-vinyl lactams containing a cyclic alkyl group containing from 4 to 9 carbon atoms, such as n-vinylpyrrolidone, N-butyrolactam and N-vinylcaprolactam, vinyl alcohol of formula CH2=CHOH, - Formula (B) below:

[0056] [ka]

[0057] (In the formula, -R 15 is selected from H, —CH3, —C2H5 and —C3H7; - X2 - OR 16 Type (wherein R 16 is a linear or branched, saturated or unsaturated hydrocarbon-based group containing 1 to 6 carbon atoms, optionally substituted with a halogen atom (iodine, bromine, chlorine, or fluorine); an alkyl ether of; a hydroxyl group (—OH); an ether A water-soluble vinyl monomer.

[0058] Examples include glycidyl (meth)acrylate, hydroxyethyl methacrylate, and (meth)acrylates of ethylene glycol, diethylene glycol, or polyalkylene glycol.

[0059] Among the hydrophobic comonomers not containing a fatty chain, examples that may be mentioned include: styrene and its derivatives, such as 4-butylstyrene, α-methylstyrene and vinyltoluene; - vinyl acetate of formula CH2=CH-OCOCH3, vinyl ethers of formula CH2=CHOR, where R is a linear or branched, saturated or unsaturated hydrocarbon-based group containing 1 to 6 carbon atoms, acrylonitrile, - caprolactone, - vinyl chloride and vinylidene chloride, silicone derivatives which, after polymerization, give silicone polymers, such as methacryloxypropyltris(trimethylsiloxy)silane and silicone methacrylamide; - the following formula (C):

[0060] [ka]

[0061] (In the formula, -R 23 is selected from H, —CH3, —C2H5 and —C3H7; - X3 - OR 24 Type (wherein R 24 is a linear or branched, saturated or unsaturated hydrocarbon-based group containing 1 to 6 carbon atoms) Hydrophobic vinyl monomer.

[0062] Examples include methyl methacrylate, ethyl methacrylate, n-butyl (meth)acrylate, tert-butyl (meth)acrylate, cyclohexyl acrylate, isobornyl acrylate, and 2-ethylhexyl acrylate.

[0063] The water-soluble or water-dispersible AMPS® polymers of the present invention preferably have a molar mass in the range of 50,000 g / mol to 10,000,000 g / mol, preferably 80,000 g / mol to 8,000,000 g / mol, even more preferably 100,000 g / mol to 7,000,000 g / mol.

[0064] Examples of water-soluble or water-dispersible AMPS homopolymers according to the invention that may be mentioned include crosslinked or non-crosslinked polymers of sodium acrylamido-2-methylpropanesulfonate, such as the polymer used in the commercial product Simulgel™ 800 (CTFA name: sodium polyacryloyldimethyltaurate).

[0065] Examples of water-soluble or water-dispersible AMPS copolymers according to the invention that may be mentioned include: - acrylamide / sodium acrylamido-2-methylpropanesulfonate crosslinked copolymers, such as the commercial product Sepigel 305 (CTFA name: Polyacrylamide / C 13 ~C 14 Copolymers used in the commercial product sold under the trade name Simulgel™ 600 (CTFA name: Acrylamide / Sodium Acryloyldimethyltaurate / Isohexadecane / Polysorbate-80), copolymers of AMPS with vinylpyrrolidone or vinylformamide, such as those used in the commercial product sold under the name Aristoflex AVC® by the company Clariant (CTFA name: Ammonium Acryloyldimethyltaurate / VP Copolymer), but neutralized with sodium hydroxide or potassium hydroxide; copolymers of AMPS and sodium acrylate, such as AMPS / sodium acrylate copolymers, for example the copolymer used in the commercial product sold under the name Simulgel™ EG by the company SEPPIC (CTFA name: Acrylamide / Sodium Acryloyldimethyltaurate / Isohexadecane / Polysorbate-80); Copolymers of AMPS and hydroxyethyl acrylate, such as AMPS / hydroxyethyl acrylate copolymers, such as the copolymers used in the commercial product sold under the name Simulgel™ NS by the company SEPPIC (CTFA name: Hydroxyethyl Acrylate / Sodium Acryloyldimethyltaurate Copolymer (and) Squalane (and) Polysorbate-60).

[0066] Preferred polymers are in particular the sodium acrylamido-2-methylpropanesulfonate homopolymer, such as that used in the commercial product Sepigel™ 800, and the AMPS® / hydroxyethyl acrylate copolymer, such as that used in the commercial product sold under the name Simulgel NS.

[0067] According to one particularly preferred embodiment of the invention, the AMPS® polymer or copolymer is used in powder form.

[0068] Polymers derived from AMPS may further include: 80 mol% to 99 mol% of the following formula (D):

[0069] [ka]

[0070] (In the formula, X + is a proton, an alkali metal cation, an alkaline earth metal cation, or an ammonium ion) 2-acrylamido-2-methylpropanesulfonic acid (AMPS®) units of 1 mol % to 20 mol %, preferably 1 mol % to 15 mol %, of the following formula (E):

[0071] [ka]

[0072] (wherein n and p represent, independently of one another, the number of moles and are in the range of 0 to 30, preferably 1 to 20, with the proviso that n+p is equal to or less than 30, preferably less than 25, and even better less than 20; R1 represents a hydrogen atom or a linear or branched C1-C6 alkyl group (preferably methyl); R2 represents a linear or branched alkyl group containing m carbon atoms, with m being in the range of 6 to 30, preferably 10 to 25). Units of It may also include.

[0073] These polymers according to the invention can be obtained according to standard free radical polymerization methods in the presence of one or more initiators, such as azobisisobutyronitrile (AIBN), azobisdimethylvaleronitrile, 2,2-azobis[2-amidinopropane]hydrochloride (ABAH = 2,2-azobis-[2-amidinopropane]hydrochloride), organic peroxides, such as dilauryl peroxide, benzoyl peroxide, tert-butyl hydroperoxide, inorganic peroxide compounds, such as potassium or ammonium persulfate, or H2O2, optionally in the presence of a reducing agent.

[0074] The polymers are obtained, inter alia, by free-radical polymerization in a tert-butanol medium in which they precipitate. Polymerization in tert-butanol can be used to obtain a size distribution of the polymer particles that is particularly favorable for use.

[0075] The polymerization reaction can be carried out at either atmospheric or reduced pressure, at temperatures between 0° C. and 150° C., preferably between 20° C. and 100° C. It can also be carried out under an inert atmosphere, preferably under nitrogen.

[0076] Thus, 2-acrylamido-2-methylpropanesulfonic acid (AMPS®), or its sodium or ammonium salts, can be converted into (meth)acrylic acid and - C oxyethylated with 8 moles of ethylene oxide 10 ~C 18 Alcohol (Genapol C-080® from Clariant), - C oxyethylated with 8 moles of ethylene oxide 11 oxo alcohol (Genapol UD-080® from Clariant), - C oxyethylated with 7 moles of ethylene oxide 11 oxo alcohol (Genapol UD-070® from Clariant), - C oxyethylated with 7 moles of ethylene oxide 12 ~C 14 Alcohol (Genapol LA-070® from Clariant), - C oxyethylated with 9 moles of ethylene oxide 12 ~C 14 Alcohol (Genapol LA-090® from Clariant), - C oxyethylated with 11 moles of ethylene oxide 12 ~C 14 Alcohol (Genapol LA-110® manufactured by Clariant), - C oxyethylated with 8 moles of ethylene oxide 16 ~C 18 Alcohol (Genapol T-080® manufactured by Clariant), - C oxyethylated with 11 moles of ethylene oxide 16~C 18 Alcohol (Genapol T-110® manufactured by Clariant), - C oxyethylated with 15 mol of ethylene oxide 16 ~C 18 Alcohol (Genapol T-150® from Clariant), - C oxyethylated with 20 moles of ethylene oxide 16 ~C 18 Alcohol (Genapol T-200® manufactured by Clariant), - C oxyethylated with 25 mol of ethylene oxide 16 ~C 18 Alcohol (Genapol T-250® manufactured by Clariant), - C oxyethylated with 25 mol of ethylene oxide 18 ~C 22 alcohol, - C oxyethylated with 25 mol of ethylene oxide 16 ~C 18 Isoalcohol Polymers prepared using esters of the formula:

[0077] According to one preferred embodiment, the polymer is a mixture of AMPS®, methacrylic acid or a methacrylic acid salt, and C oxyethylenated with 6 to 25 moles of ethylene oxide. 16 ~C 18 C containing 6 to 25 mol of oxyethylene groups obtained from alcohol 16 ~C 18 It is a copolymer with alcohol methacrylate.

[0078] The polymer may also be a mixture of AMPS®, methacrylic acid or a methacrylate salt, and C oxyethylenated with 6 to 25 moles of ethylene oxide. 12 ~C 14 C containing 6 to 25 mol of oxyethylene groups obtained from alcohol 12 ~C 14It may also be a copolymer with an alcohol methacrylate.

[0079] Preferred AMPS® type polymers according to the invention include: 92.65 mol % AMPS® and 7.35 mol % C containing 8 oxyethylene groups 16 ~C 18 a non-crosslinked copolymer obtained from alcohol methacrylate (Genapol T-080®), - 91.5 mol % AMPS® and 8.5 mol % C containing 7 oxyethylene groups 12 ~C 14 a non-crosslinked copolymer obtained from alcohol methacrylate (Genapol LA-070®), 96.45 mol % AMPS® and 3.55 mol % C containing 25 oxyethylene groups 16 ~C 18 Crosslinked copolymer obtained from alcohol methacrylate (Genapol T-250®) (crosslinker is trimethylolpropane triacrylate), - AMPS® and C containing 25 oxyethylene groups 22 a crosslinked copolymer obtained from alcohol methacrylate (this polymer is sold under the name Aristoflex HMB® by Clariant), acrylamide / sodium 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonate (AMPS®) copolymers, such as Simulgel 600® in the form of an emulsion containing polysorbate 80 as surfactant and isohexadecane as fatty phase, sold by the company SEPPIC, or alternatively Simulgel EG®, Simulgel A® and Simulgel 501®, sold by the same company; Examples include:

[0080] Simulgel 600® is described, inter alia, in document FR 2 785 801. It is more particularly an inverse latex. The AMPS® polyelectrolyte is 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, partially or completely salified, in particular in the form of its sodium or ammonium salt, in a proportion of 30 mol % to 50 mol % in a mixture containing AMPS® and acrylamide (itself in a proportion of 50% to 70%).

[0081] For the purposes of the present invention, a preferred polymer derived from AMPS® is the optionally crosslinked and / or neutralized 2-acrylamido-2-methylpropanesulfonic acid homopolymer, such as poly(2-acrylamido-2-methylpropanesulfonic acid) sold by Clariant under the name Hostacerin AMPS® (CTFA name: Ammonium polyacryldimethyltauramide).

[0082] Advantageously, the polymer comprising at least one 2-acrylamido-2-methylpropanesulfonic acid monomer is present in the composition according to the invention in an amount ranging from 0.01% to 5% by weight, preferably from 0.1% to 3% by weight, more preferably from 0.2% to 1% by weight relative to the total weight of the composition.

[0083] Advantageously, the polymer comprising at least one 2-acrylamido-2-methylpropanesulfonic acid monomer is present in the composition according to the invention in an amount greater than or equal to 0.1% by weight, preferably greater than or equal to 0.3% by weight, relative to the total weight of the composition.

[0084] Polyoxybutylene Polyoxyethylene Polyoxypropylene Glycerol According to a first embodiment, the composition of the invention comprises at least one polyoxybutylene polyoxyethylene polyoxypropylene glycerol.

[0085] Polyoxybutylene polyoxyethylene polyoxypropylene glycerol has the formula (I) shown below: Gly-{O(PO) s (EO) t -(BO) u H}3(I) (In the formula, Gly denotes the residue obtained by removing the hydroxyl group from glycerol; PO represents an oxypropylene group; EO represents an oxyethylene group; s and t represent the average number of moles of PO and EO added, respectively, and have a value within a range of 1 to 50; The mass ratio of PO to EO (PO / EO) is in the range of 1 / 5 to 5 / 1, BO represents an oxyalkylene group having 4 carbon atoms; u represents the average number of moles of BO added, and is in the range of 0.5 to 5. It can be expressed as:

[0086] Advantageously, in formula (I): s is in the range of 2 to 15, preferably 3 to 7; t is in the range of 3 to 20, preferably 6 to 10; u is in the range of 1 to 5, preferably 2 to 4.

[0087] The polyoxybutylene polyoxyethylene polyoxypropylene glycerol represented by formula (I) can be obtained by adding propylene oxide and ethylene oxide to glycerin in a ratio of 3 to 150 molar equivalents each of propylene oxide and ethylene oxide to glycerin, and subsequently adding an alkylene oxide having 4 carbon atoms in a ratio of 1.5 to 15 molar equivalents to glycerin.

[0088] When the alkylene oxide is added to glycerin, the addition reaction is carried out using an alkali catalyst, a phase transfer catalyst, a Lewis acid catalyst, etc. In general, an alkali catalyst, such as potassium hydroxide, is preferably used.

[0089] Among the polyoxybutylene polyoxyethylene polyoxypropylene glycerols represented by formula (I), more preferred are those obtained by adding 6 to 10 mol of ethylene oxide and 3 to 7 mol of propylene oxide to glycerin, and then adding 2 to 4 mol of butylene oxide.

[0090] Among the polyoxybutylene polyoxyethylene polyoxypropylene glycerols represented by formula (I), PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin is preferred, which is obtained by adding 8 mol of ethylene oxide and 5 mol of propylene oxide to glycerin, followed by adding 3 mol of butylene oxide.

[0091] PEG / PPG / Polybutylene Glycol-8 / 5 / 3 Glycerin is commercially available from NOF Corporation under the trade name WILBRIDE S-753.

[0092] Advantageously, the polyoxybutylene polyoxyethylene polyoxypropylene glycerol is present in the composition according to the invention in an amount ranging from 0.01% to 15% by weight, preferably from 0.5% to 5% by weight, and more preferably from 0.5% to 2% by weight relative to the total weight of the composition.

[0093] C2-C4 polyols According to a first embodiment, the composition of the invention comprises at least one C2-C4 polyol.

[0094] As used herein, the term "polyol" means an alcohol having two or more hydroxy groups.

[0095] The polyol may be a natural or synthetic polyol. The polyol may have a linear, branched or cyclic molecular structure.

[0096] The C2-C4 polyol may be selected from glycerin and its derivatives, and glycol and its derivatives.

[0097] The polyol may be selected from the group consisting of glycerin, ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, and mixtures thereof.

[0098] In the present invention, the definition of polyol includes all possible isomers. For example, propylene glycol includes 1,3-propylene glycol, 1,2-propylene glycol, and 1,1-propylene glycol. Butylene glycol includes 1,4-butylene glycol, 1,3-butylene glycol, 1,2-butylene glycol, etc.

[0099] Preferably, the C2-C4 polyol is selected from propanediol, butylene glycol, glycerin, and combinations thereof.

[0100] More preferably, the compositions of the present invention comprise glycerin and propanediol.

[0101] Advantageously, the C2-C4 polyol is present in the composition according to the invention in an amount ranging from 0.01% to 20% by weight, preferably from 5% to 15% by weight, relative to the total weight of the composition.

[0102] According to the invention, the composition of the invention does not contain more than 1% of diols containing 5 or more carbon atoms.

[0103] As used herein, the term "diol" means an alcohol having two hydroxy groups.

[0104] For example, the diol containing 5 or more carbon atoms can be pentylene glycol, hexylene glycol, or a mixture thereof.

[0105] In some embodiments, the compositions of the present invention do not include a diol containing 5 or more carbon atoms.

[0106] aqueous phase Preferably, the compositions of the present invention comprise an aqueous phase.

[0107] The aqueous phase comprises water.

[0108] Advantageously, water is present in the composition of the invention in an amount ranging from 60% to 90% by weight, preferably from 70% to 88% by weight, relative to the total weight of the composition.

[0109] Additional cosmetic active ingredients The compositions of the present invention may also contain additional cosmetically active ingredients.

[0110] Examples of cosmetic active ingredients include moisturizers, such as protein hydrolysates; plant extracts; other vitamins, such as vitamin A (retinol), vitamin E (tocopherol), vitamin C (ascorbic acid), vitamin B (panthenol), and derivatives (especially esters) of said vitamins, and mixtures thereof; urea; caffeine; anti-aging active substances; tightening agents; agents acting on the microcirculation, and mixtures thereof.

[0111] Those skilled in the art will readily be able to adjust the amount of additional cosmetically active ingredients based on the end use of the composition according to the present invention.

[0112] Additional adjuvants or additives The compositions of the present invention may comprise or contain conventional cosmetic adjuvants or additives, such as chelating agents, pH adjusters, other thickening agents, and mixtures thereof.

[0113] According to a first embodiment, the composition is preservative-free.

[0114] Those skilled in the art will be able to select the amount of additional adjuvants or additives so as not to adversely affect the end use of the composition according to the invention.

[0115] Preferably, the composition according to the invention does not contain any fermentation extracts or polysaccharide gums such as xanthan gum.

[0116] According to a particularly preferred embodiment, the present invention relates to a composition for caring for keratinous materials, comprising, in the aqueous phase, relative to the total weight of the composition: (i) 0.2% by mass to 0.5% by mass of sodium polyacrylate; (ii) 0.2% to 0.5% by weight of a polymer comprising at least one 2-acrylamido-2-methylpropanesulfonic acid monomer selected from sodium polyacryloyldimethyltaurate, ammonium polyacryloyldimethyltaurate, potassium polyacryloyldimethyltaurate, and combinations thereof; (iii) 0.5% to 2% by weight of PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin; (iv) 5% by mass to 15% by mass of at least one C2 to C4 polyol selected from propanediol, butylene glycol, glycerin, and combinations thereof; Including, Contains no more than 1% of diols containing 5 or more carbon atoms and preservatives; A composition is provided.

[0117] mask The composition according to the present invention can be impregnated into a water-insoluble mask tissue to form a mask.

[0118] According to a second aspect, the invention relates to a mask for caring for keratinous materials, comprising: A) Water-insoluble mask tissue B) a composition according to the present invention impregnated into a mask tissue; To provide a mask comprising:

[0119] Water-insoluble mask tissue According to a second aspect, the mask according to the invention comprises a water-insoluble mask tissue.

[0120] For purposes of the present invention, the term "water-insoluble" means that the mask tissue is not water-soluble and does not disintegrate when immersed in water.

[0121] Those skilled in the art will be able to select a suitable mask tissue and the mass ratio of mask tissue to composition according to the present invention to be used based on the properties of the composition.

[0122] The mask tissue may be a woven or nonwoven fabric made of 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 types of fibers selected from the above may be used in combination.

[0123] In some embodiments, the mask tissue is an alginate tissue.

[0124] Alginate tissue is known in the art and is described in WO2020001069A1.

[0125] For example, the alginate tissue may contain a water-insoluble alginate selected from calcium alginate, strontium alginate, zinc alginate, copper alginate, manganese alginate, or mixtures thereof, preferably calcium alginate, preferably in an amount within the range of 20% to 100% by weight, preferably 20% to 50% by weight, based on the total weight of the tissue.

[0126] Preferably, when the mask tissue is an alginate tissue, the composition according to the present invention comprises a pH adjuster selected from sodium acetate, sodium citrate, sodium tartrate, and combinations thereof in an amount in the range of 0.01% by mass to 1.0% by mass, preferably 0.05% by mass to 0.45% by mass, more preferably 0.15% by mass to 0.3% by mass, relative to the total mass of the composition according to the present invention.

[0127] Mask tissue can be made of one or more layers.When multi-layer tissue is used, the material of each layer can be the same or different.Multi-layer tissue can be prepared by stacking multiple layers made of the above-mentioned materials.

[0128] The mask tissue can have a wide variety of shapes depending on the use and characteristics desired for the mask.

[0129] Mask tissues are typically designed to conform to the area of ​​skin where topical application is desired, for example, if the mask is to be applied to the face, the mask tissue is designed to conform to the shape of the face, avoiding the eye, nostril, and mouth areas, if necessary.

[0130] Preferably, the mass ratio of the water-insoluble substrate to the composition is within the range of 1:3 to 1:20, and more preferably, the mass ratio of the water-insoluble substrate to the composition is within the range of 1:10 to 1:18.

[0131] Galenic forms and uses The composition of the present invention can be in the form of a homogeneous aqueous system.

[0132] The compositions of the invention can be used to care for keratinous materials, especially the skin.

[0133] In particular, the compositions and masks according to the invention are intended for topical application and skin care.

[0134] According to a third aspect, the present invention provides a non-therapeutic method for caring for keratinous materials, comprising the step of applying a composition according to the present invention to the keratinous materials.

[0135] According to a fourth aspect, the present invention provides a non-therapeutic method for caring for keratinous materials, comprising: (i) applying a mask according to the invention to keratinous materials; (ii) leaving the mask on the keratinous material for a period of time; (iii) removing the mask from the keratinous material; The present invention provides a non-therapeutic method comprising:

[0136] In particular, the keratinous material is skin.

[0137] The mask as defined above is applied to at least one zone of the skin.

[0138] In particular, the composition or mask defined above is applied to the facial skin and / or the eye skin.

[0139] Preferably, the application time is 5 to 45 minutes, preferably 10 to 30 minutes.

[0140] The following examples serve to illustrate the invention but are not limiting in nature. [Example]

[0141] The main raw materials used, their trade names and suppliers are listed in Table 1.

[0142] [Table 1]

[0143] (Example 1 of the present invention and Comparative Examples 1 to 6) Compositions of Example (IE) 1 of the present invention and Comparative Examples (CE) 1-6 were prepared based on the amounts shown in Table 2. The amounts are given as % by weight of active ingredient relative to the total weight of the composition.

[0144] [Table 2]

[0145] Preparation method The compositions listed above, taking the composition of Formula 1 of the present invention as an example, were prepared as follows. 1) Add the water, glycerin and propanediol, and the PEG / PPG / Polybutylene Glycol-8 / 5 / 3 glycerin to a beaker while stirring. 2) Slowly add the sodium polyacrylate and ammonium polyacryloyldimethyltaurate to the beaker while stirring. 3) Citric acid is added to the beaker with stirring to obtain a uniform composition. 4) The composition prepared above is filled into a sachet together with a mask tissue, which is a nonwoven fabric made of cellulose fiber (the mass ratio of the substrate to the composition used is 1:17), and the sachet is sealed. 5) Place the sachet in a steam oven, heat the steam oven to 121°C for 15 minutes, then cool the oven, and then remove the resulting mask.

[0146] evaluation stability The stability of the tested compositions was evaluated as follows. 1) The samples were filled into 100 mL standard glass bottles to 80% of the total volume, and seven bottles were prepared for each composition to be tested. 2) One bottle was placed at room temperature (25°C), one bottle was placed in a refrigerator at 4°C, one bottle was placed in an oven at 37°C, one bottle was placed in an oven at 45°C (for stability testing at different temperatures), and one bottle was placed in an oven and temperature cycled from -10°C to 10°C (for cycling stability). 3) The appearance of the samples was observed after 2 months for the stability tests at room temperature, 4°C, 37°C, and 45°C, and after 10 days for the cycle stability tests.

[0147] The stability of a composition is evaluated as stable if, after all of the stability tests mentioned above, the tested composition shows no separation, no sensory changes, and no change in odor; otherwise, it is evaluated as unstable.

[0148] Odor and sensory Ten women aged 25 to 40 were invited to evaluate the samples by touching, smelling, and applying them to their hands to test their sensory and odor properties. They were then scored according to the following criteria, and the scores were averaged. 5: Excellent, 4: Good, 3: Unpleasant, 2: Defective, 1: Unacceptable.

[0149] The stability results for each of the compositions prepared above are summarized in Table 3.

[0150] [Table 3]

Claims

1. A composition for caring for keratinous materials, comprising: (i) at least one salt of polyacrylic acid; (ii) at least one polymer comprising at least one monomer of 2-acrylamido-2-methylpropanesulfonic acid; (iii) at least one polyoxybutylene polyoxyethylene polyoxypropylene glycerol; (iv) at least one C2-C4 polyol; Including, Contains no more than 1% of diols containing 5 or more carbon atoms and preservatives; composition.

2. 2. The composition of claim 1, wherein the salt of polyacrylic acid is selected from metal salts of polyacrylic acid, preferably selected from sodium, potassium, lithium and ammonium salts of polyacrylic acid, more preferably sodium polyacrylate.

3. 3. The composition according to claim 1, wherein the acrylic monomers of the salt of polyacrylic acid are neutralized to a degree of between 90% and 100%.

4. 4. The composition according to any one of claims 1 to 3, wherein the salt of polyacrylic acid is present in an amount ranging from 0.01% to 5% by weight, preferably from 0.1% to 2% by weight, more preferably from 0.2% to 0.5% by weight, relative to the total weight of the composition.

5. 5. The composition according to claim 1, wherein the polymer comprising at least one monomer of 2-acrylamido-2-methylpropanesulfonic acid is selected from 2-acrylamido-2-methylpropanesulfonic acid homopolymers, optionally crosslinked and / or neutralized.

6. 6. The composition of claim 1, wherein the polymer comprising at least one monomer of 2-acrylamido-2-methylpropanesulfonic acid is selected from sodium polyacryloyldimethyltaurate, ammonium polyacryloyldimethyltaurate, potassium polyacryloyldimethyltaurate, and combinations thereof.

7. 7. The composition according to any one of claims 1 to 6, wherein the polymer comprising at least one monomer of 2-acrylamido-2-methylpropanesulfonic acid is present in an amount ranging from 0.01% to 5% by weight, preferably from 0.1% to 3% by weight, more preferably from 0.2% to 1% by weight, relative to the total weight of the composition.

8. The polyoxybutylene polyoxyethylene polyoxypropylene glycerol has the formula (I) shown below: Gly-{O(PO) s (E.O.) t -(BO) u H} 3 (I) (In the formula, Gly denotes the residue obtained by removing the hydroxyl group from glycerol; PO represents an oxypropylene group; EO represents an oxyethylene group; s and t represent the average number of moles of PO and EO added, respectively, and have values ​​within the range of 1 to 50; the mass ratio of PO to EO (PO / EO) is in the range of 1 / 5 to 5 / 1; BO represents an oxyalkylene group having 4 carbon atoms; u represents the average number of moles of BO added, which is in the range of 0.5 to 5.

8. The composition of claim 1, wherein the composition is represented by:

9. In formula (I), s is in the range of 2 to 15, preferably 3 to 7; t is in the range of 3 to 20, preferably 6 to 10; u is in the range of 1 to 5, preferably 2 to 4; 9. The composition of claim 8.

10. 10. The composition of claim 1, wherein the polyoxybutylene polyoxyethylene polyoxypropylene glycerol is PEG / PPG / Polybutylene Glycol-8 / 5 / 3 Glycerin.

11. 11. The composition according to any one of claims 1 to 10, wherein the polyoxybutylene polyoxyethylene polyoxypropylene glycerol is present in an amount ranging from 0.01% to 15% by weight, preferably from 0.5% to 5% by weight, more preferably from 0.5% to 2% by weight, relative to the total weight of the composition.

12. 12. The composition of any one of claims 1 to 11, wherein the C2 to C4 polyol is selected from propanediol, butylene glycol, glycerin, and combinations thereof.

13. 13. The composition according to any one of claims 1 to 12, wherein the C2-C4 polyol is present in an amount ranging from 0.01% to 20% by weight, preferably from 5% to 15% by weight, relative to the total weight of the composition.

14. 14. The composition according to any one of claims 1 to 13, which does not contain any flavourings or fermentation extracts, nor any polysaccharide gums or diols containing 5 to 10 carbon atoms.

15. In the aqueous phase, based on the total weight of the composition: (i) 0.2% by weight to 0.4% by weight of sodium polyacrylate; (ii) 0.2% to 0.5% by weight of a polymer comprising at least one 2-acrylamido-2-methylpropanesulfonic acid monomer selected from sodium polyacryloyldimethyltaurate, ammonium polyacryloyldimethyltaurate, potassium polyacryloyldimethyltaurate, and combinations thereof; (iii) 0.5% to 2% by weight of PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin; (iv) 5% to 15% by weight of at least one C2 to C4 polyol selected from propanediol, butylene glycol, glycerin, and combinations thereof; Including, Contains no more than 1% of diols containing 5 or more carbon atoms and preservatives; 10. The composition of claim 1.

16. A mask for caring for keratinous materials, comprising in an aqueous phase: A) Water-insoluble mask tissue B) a composition according to any one of claims 1 to 15 impregnated into the mask tissue; Including, mask.

17. 17. The mask according to claim 16, wherein the mass ratio of the water-insoluble substrate to the composition is in the range of 1:3 to 1:20, and more preferably, the mass ratio of the water-insoluble substrate to the composition is in the range of 1:10 to 1:

18.

18. A non-therapeutic method for caring for keratinous materials, comprising the step of applying a composition according to any one of claims 1 to 15 to said keratinous materials.

19. A non-therapeutic method for caring for keratinous materials, comprising: (i) applying a mask according to claim 16 or 17 to the keratinous material; (ii) leaving the mask on the keratinous material for a period of time; (iii) removing the mask from the keratinous material; Non-therapeutic methods, including:

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