Composition suitable for the cosmetic treatment of the skin

Abstract

To provide a composition containing a polyamino acid such as polyglutamic acid or a salt thereof, and a linear polysaccharide such as hyaluronic acid or a salt thereof, and capable of forming a non-transparent film.SOLUTION: A composition comprising: (a) at least one polyamino acid or salt thereof; (b) at least one linear polysaccharide; and (c) at least one filler.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a composition, preferably a cosmetic composition, more preferably a skin cosmetic composition, capable of forming an opaque film. [Background technology]

[0002] In the field of skin care, one challenge is to instantly lighten the skin tone, which can be achieved, for example, by scattering light on the skin. A non-transparent film, such as a semi-transparent film on the skin, is likely to effectively scatter light on the skin, while a transparent film is likely not to scatter light.

[0003] Hyaluronic acid has been widely used in cosmetics in search of moisturizing effects, etc. Hyaluronic acid can form a film on keratinous materials such as skin, etc. However, the film of hyaluronic acid is very transparent, and therefore cannot provide any skin lightening effect.

[0004] On the other hand, polyglutamic acid has been proposed for use in cosmetics in search of moisturizing effects, etc. Polyglutamic acid can also form a film on keratinous materials such as skin, but the film of polyglutamic acid is very transparent and therefore cannot provide any skin lightening effect. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] U.S. Patent No. 7,470,725 [Patent Document 2] JP-A-2014-088307 [Patent Document 3] JP-A-2014-218433 [Patent Document 4] JP-A-2018-177620 [Non-patent literature]

[0006] [Non-Patent Document 1] Phys. Rev. Lett. 1993, 71, 3158 [Non-patent document 2] D. Campoccia et al., "Semisynthetic resorbable materials from hyaluronan esterification", Biomaterials 19 (1998) pp. 2101-2127 [Non-patent document 3] Brinker CJ and Scherer GW, Sol-Gel Science, New York, Academic Press, 1990. [Non-patent document 4] The Journal of the American Chemical Society, Vol. 60, p. 309, February 1938 [Non-patent document 5] Van de Hulst, H.C., "Light Scattering by Small Particles," Chapters 9 and 10, Wiley, New York, 1957. [Non-patent document 6] Barrett, EP; Joyner, LG; Halenda, PP, J. Am. Chem. Soc. 73, 373 (1951) Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a composition that contains a polyamino acid such as polyglutamic acid or a salt thereof, and a linear polysaccharide such as hyaluronic acid or a salt thereof, and that is capable of forming an opaque film. [Means for solving the problem]

[0008] The above object of the present invention is to (a) at least one polyamino acid or a salt thereof; (b) at least one linear polysaccharide; (c) at least one filler; This can be achieved by a composition, preferably a cosmetic composition, more preferably a dermocosmetic composition, comprising:

[0009] The viscosity of a 1% by mass aqueous solution of (b) the linear polysaccharide is preferably at least 10 times higher than the viscosity of a 1% by mass aqueous solution of (a) the polyamino acid or a salt thereof.

[0010] The polyamino acid may be selected from polyglutamic acid.

[0011] The amount of (a) polyamino acid or a salt thereof in the composition according to the present invention may be in the range of 0.01% by mass to 5% by mass, preferably 0.05% by mass to 3% by mass, and more preferably 0.1% by mass to 1% by mass, relative to the total mass of the composition.

[0012] (b) The linear polysaccharide may be selected from the group consisting of hyaluronic acid, hyaluronate salts, hyaluronic acid derivatives, hyaluronic acid derivative salts, and mixtures thereof.

[0013] (b) The linear polysaccharide can be selected from hyaluronates, preferably alkali metal hyaluronates, more preferably sodium hyaluronate.

[0014] The amount of (b) linear polysaccharide in the composition according to the present invention may be in the range of 0.01% by mass to 5% by mass, preferably 0.05% by mass to 3% by mass, and more preferably 0.1% by mass to 1% by mass, relative to the total mass of the composition.

[0015] (c) The filler may be selected from inorganic fillers, preferably metal oxides, more preferably silica.

[0016] (c) The filler may be selected from hydrophobic inorganic fillers, preferably hydrophobically modified metal oxides, more preferably hydrophobically modified silica, zinc oxide, and mixtures thereof.

[0017] (c) The filler may be selected from hydrophobic silica, preferably from hydrophobic silica aerogel particles, more preferably from hydrophobic aerogel particles of silica silylate.

[0018] The amount of (c) filler in the composition according to the present invention may be in the range of 0.01% by mass to 5% by mass, preferably 0.05% by mass to 3% by mass, and more preferably 0.1% by mass to 1.5% by mass, relative to the total mass of the composition.

[0019] The composition according to the present invention may further comprise (d) at least one branched polysaccharide.

[0020] (d) The branched polysaccharide may be selected from heteropolysaccharides consisting of at least two components selected from the group consisting of glucose, galactose, mannose, xylose, rhamnose, arabinose, and glucuronic acid, preferably xanthan gum, locust bean gum, tamarind gum, karaya gum, tragacanth gum, gum arabic, branched dextrin, succinoglycan, and mixtures thereof, more preferably locust bean gum, xanthan gum, and mixtures thereof.

[0021] The amount of (d) branched polysaccharide in the composition according to the present invention may be in the range of 0.01% to 5% by mass, preferably 0.05% to 3% by mass, and more preferably 0.1% to 1% by mass, relative to the total mass of the composition.

[0022] The present invention also relates to a cosmetic method for treating keratinous materials such as the skin, which comprises the step of applying a composition according to the present invention onto the keratinous materials. DETAILED DESCRIPTION OF THE INVENTION

[0023] As a result of extensive research, the present inventors have discovered that it is possible to provide a composition that contains a polyamino acid such as polyglutamic acid or a salt thereof, and a linear polysaccharide such as hyaluronic acid or a salt thereof, and that is capable of forming an opaque film.

[0024] Thus, one aspect of the present invention is (a) at least one polyamino acid or a salt thereof; (b) at least one linear polysaccharide; (c) at least one filler; A composition comprising:

[0025] The composition according to the present invention is capable of forming a non-transparent film, preferably a semi-transparent or opaque film, more preferably a semi-transparent film.

[0026] The opaque film formed by the composition according to the invention is capable of lightening keratinous materials such as skin.

[0027] When dissolved in water, the (b) linear polysaccharide can provide a thickening effect greater than that of the (a) polyamino acid or its salt. For example, a 1% by mass aqueous solution of the (b) linear polysaccharide can have a viscosity (at 20°C) that is at least 10 times, preferably 50 times, and more preferably 100 times higher than that of a 1% by mass aqueous solution of the (a) polyamino acid or its salt. The viscosity can be measured under atmospheric pressure using a viscometer such as a Brookfield viscometer or a rheometer. This viscosity difference can cause viscoelastic phase separation (Phys. Rev. Lett. 1993, 71, 3158), resulting in the formation of a non-transparent film.

[0028] The compositions according to the invention are suitable for cosmetic skin treatments such as skin care and skin make-up.

[0029] The compositions according to the present invention may also provide additional benefits.

[0030] (a) Polyamino acids such as polyglutamic acid or salts thereof are water-absorbing and film-forming, and therefore, the composition according to the present invention containing (a) polyamino acids or salts thereof can form a film on keratinous materials such as skin that can provide a moisturizing effect.

[0031] (b) Linear polysaccharides such as hyaluronic acid and its salts are also water-absorbing and film-forming, and therefore, the composition according to the present invention containing (b) linear polysaccharides can form a film on keratinous materials such as skin that can provide a moisturizing effect.

[0032] (c) Fillers can contribute to the smoothness of the composition according to the invention after application onto keratinous materials such as the skin.

[0033] Additionally, (c) the filler may also provide a matte finish effect if it is capable of absorbing oil or sebum.

[0034] When the composition according to the present invention further comprises (d) a branched polysaccharide, the composition according to the present invention can increase the opacity of the film formed by the composition according to the present invention, depending on the type of (c) filler.

[0035] When the composition according to the present invention further comprises (e) water, the composition according to the present invention can also provide good hydration effects and a cooling sensation.

[0036] The present invention will now be described in more detail.

[0037] [Composition] The composition according to the present invention comprises (a) at least one polyamino acid or a salt thereof; (b) at least one linear polysaccharide; (c) at least one filler; Includes.

[0038] (Polyamino acid or its salt) The composition according to the present invention comprises (a) at least one polyamino acid or a salt thereof. A single type of polyamino acid or a salt thereof may be used, or two or more different types of polyamino acids or salts thereof may be used in combination.

[0039] Preferably, the polyamino acid is selected from polyglutamic acid, so that component (a) in the composition according to the invention is preferably at least one polyglutamic acid or a salt thereof.

[0040] Polyglutamic acid or a salt thereof has the following chemical formula (1): ROOC-CH2CH2-CH(-COOR)-NH-[CO-CH2CH2-CH(-COOR)-NH-] n -CO-CH2CH2-CH(-COOR)-NH2(1) (In the formula, R independently represents a hydrogen atom, an alkali metal atom such as a sodium atom or a potassium atom, or an ammonium group such as a tetramethylammonium group or a tetraethylammonium group; n is an integer of 2 or more, preferably 4 or more, and more preferably 6 or more. It may have a chemical structure represented by:

[0041] The polyglutamic acid or a salt thereof represented by the above chemical formula (1) can be called a γ-polyglutamic acid or a salt thereof because the carboxylic acid group at the γ-position and the amino group at the α-position form a peptide bond.

[0042] It may be preferable that the molecular weight of the polyglutamic acid or a salt thereof is 1000 or more and the degree of polymerization is 8 or more ("n" in the above chemical formula (1) is 6 or more).

[0043] It may be more preferable that the molecular weight of the polyglutamic acid or a salt thereof is 100,000 or more and the degree of polymerization is 770 or more ("n" in the above chemical formula (1) is 768 or more).

[0044] It may be even more preferable that the molecular weight of the polyglutamic acid or salt thereof is 500,000 or more and the degree of polymerization is 3840 or more ("n" in the above chemical formula (1) is 3838 or more).

[0045] There is no upper limit to the molecular weight of polyglutamic acid or a salt thereof.

[0046] However, the molecular weight of polyglutamic acid or a salt thereof may be 5,000,000 or less, and the degree of polymerization may be 38,500 or less ("n" in the above chemical formula (1) is 38,498 or less), and preferably, the molecular weight of polyglutamic acid or a salt thereof may be 3,000,000 or less, and the degree of polymerization may be 23,080 or less ("n" in the above chemical formula (1) is 23,078 or less).

[0047] Glutamic acid, which is a constituent amino acid of polyglutamic acid or its salts, may be in the D-form, L-form, or racemic form. However, in consideration of commercial availability, biocompatibility, and biodegradability, it may be preferable to use polyglutamic acid composed only of L-form glutamic acid or polyglutamic acid composed of a mixture of L- and D-form glutamic acid. However, polyglutamic acid composed of D-form glutamic acid, which has the same effect but is less degradable, can also be used.

[0048] The method for producing polyglutamic acid or its salts is not particularly limited. Examples include organic synthesis using a peptide synthesizer, organic synthesis by polymerization of glutamate N-carboxylic anhydride, and organic synthesis by polymerization of N-benzyloxycarbonyl glutamic anhydride. On the other hand, microorganisms belonging to the genus Bacillus capable of producing γ-polyglutamic acid (particularly Bacillus subtilis, Bacillus anthracis, Bacillus licheniformis, and Bacillus megaterium capable of producing γ-polyglutamic acid) can also be used in fermentation to produce polyglutamic acid or its salts.

[0049] The culture medium used in the fermentation method includes natural culture media consisting of natural products such as shochu distillery wastewater culture media and soybean extract culture media, as well as the following ingredients: carbon sources such as glucose, fructose, galactose, sucrose, maltose, mannose, lactose, glycerol, and starch; inorganic nitrogen sources such as ammonium sulfate, ammonium phosphate, and ammonium chloride; an organic nitrogen source such as glutamic acid or a salt thereof, or aspartic acid or a salt thereof; Major inorganic salts such as sodium chloride, magnesium sulfate, monopotassium phosphate, phosphorus and disodium hydrogen phosphate, trace amounts of inorganic salts containing atoms such as iron, copper, zinc, cobalt, nickel, boron, manganese, molybdenum, tin, selenium, silicon, arsenic, vanadium, chromium, and fluorine; Vitamins such as biotin, nicotinamide, calcium pantothenate, thiamine, riboflavin, and pyridoxine hydrochloride; organic acids such as citric acid, tartaric acid, malic acid, and glycolic acid; Natural product extracts such as yeast extract, meat extract, potato extract, tomato extract, and soybean peptides Any synthetic or semi-synthetic medium consisting of any one of the above may be used at any concentration.

[0050] The culture conditions for the microorganisms may be set in the range of 20° C. to 37° C. and may be further controlled during the microbial growth process and the polyglutamic acid production process, and the pH may be set in the range of 5.0 to 8.0 and may be further controlled during the microbial growth process and the polyglutamic acid production process.

[0051] After the cultivation is completed, polyglutamic acid or a salt thereof can be extracted from the culture medium and purified by any known method such as acid precipitation, solvent precipitation, or membrane purification.

[0052] As polyglutamic acid or a salt thereof, it is preferable to use polyglutamic acid or an alkali metal salt thereof, such as sodium polyglutamate.

[0053] Commercially available products may be used as polyglutamic acid or a salt thereof, such as Hyafactor™ PGA-HM sold by Bloomage Biotechnology Co., Ltd. in China, and Bio-PGA Solution HE, HB, LB, and LE, as well as Bio PGA Na powder sold by Ichimaru Pharcos Co., Ltd. in Japan.

[0054] The amount of (a) polyamino acid or a salt thereof in the composition according to the present invention may be 0.01% by mass or more, preferably 0.05% by mass or more, more preferably 0.1% by mass or more, relative to the total mass of the composition.

[0055] On the other hand, the amount of (a) polyamino acid or a salt thereof in the composition according to the present invention may be 5% by mass or less, preferably 3% by mass or less, more preferably 1% by mass or less, relative to the total mass of the composition.

[0056] Therefore, the amount of (a) polyamino acid or a salt thereof in the composition according to the present invention may be in the range of 0.01% by mass to 5% by mass, preferably 0.05% by mass to 3% by mass, and more preferably 0.1% by mass to 1% by mass, relative to the total mass of the composition.

[0057] (linear polysaccharides) The composition according to the present invention comprises (b) at least one linear polysaccharide. A single type of linear polysaccharide may be used, or two or more different types of linear polysaccharides may be used in combination.

[0058] The term "linear" as used herein in reference to a polysaccharide means that the polysaccharide does not have side chains or branches containing at least one saccharide. In other words, each monosaccharide unit in a linear polysaccharide chain contains only one or two glycosidic bonds.

[0059] (b) The linear polysaccharide may be selected from any conventional linear polysaccharide used in the cosmetic field.

[0060] Examples of such linear polysaccharides include gellan gum, alginic acid and its salts, such as sodium alginate, pectin, carrageenans, such as κ-carrageenan, linear dextrin, mucopolysaccharides (glycosaminoglycans), such as hyaluronic acid and chondroitin sulfate, cellulose and its derivatives, such as carboxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose.

[0061] In a preferred embodiment, (b) the linear polysaccharide can be selected from the group consisting of hyaluronic acid, hyaluronate salts, hyaluronic acid derivatives, hyaluronic acid derivative salts, and mixtures thereof (referred to as the "hyaluronic acid component").

[0062] Hyaluronic acid is the predominant glycosaminoglycan found in the skin. Therefore, fibroblasts predominantly synthesize collagen, non-collagenous matrix glycoproteins (fibronectin, laminin), proteoglycans, and elastin. Keratinocytes, for their part, predominantly synthesize sulfated glycosaminoglycans and hyaluronic acid. Hyaluronic acid is also called hyaluronan.

[0063] Hyaluronic acid exists in free state in epidermis and dermis, and it is responsible for the turgor of skin.This polysaccharide can actually hold a large volume of water, up to 1000 times its mass.In this sense, hyaluronic acid plays an important role in increasing the amount of water bound in tissue, and also in the mechanical properties and wrinkle formation of skin.

[0064] Hyaluronic acid can be represented by the following chemical formula:

[0065] [ka]

[0066] In the context of the present invention, the term "hyaluronic acid" specifically encompasses the basic unit of hyaluronic acid of the formula:

[0067] [ka]

[0068] This is the smallest fraction of hyaluronic acid that contains the disaccharide dimer, D-glucuronic acid and N-acetylglucosamine.

[0069] The term "hyaluronic acid," in the context of the present invention, includes linear polymers comprising the above-listed polymer units linked together in a chain via alternating β(1,4) and β(1,3) glycosidic bonds, with molecular weights (Mw) that can range between 380 and 13,000,000 daltons, which depends primarily on the source from which the hyaluronic acid is obtained and / or the method of preparation.

[0070] The term "hyaluronic acid" in the context of the present invention also includes hydrolyzed hyaluronic acid.

[0071] The term "hyaluronic acid derivatives" in the context of the present invention includes hyaluronic acid esters, in particular those in which all or part of the carboxylic acid groups of the acid function are esterified with oxyethylenated alkyls or alcohols containing 1 to 20 carbon atoms, in particular those in which the degree of substitution at the level of D-glucuronic acid of hyaluronic acid ranges from 0.5% to 50%.

[0072] Mention may in particular be made of the methyl, ethyl, n-propyl, n-pentyl, benzyl and dodecyl esters of hyaluronic acid, which are described in detail in D. Campoccia et al., "Semisynthetic resorbable materials from hyaluronan esterification", Biomaterials 19 (1998) pp. 2101-2127.

[0073] In one embodiment, the hyaluronic acid derivative may be, for example, acetylated hyaluronic acid.

[0074] The term "hyaluronic acid derivatives" in the context of the present invention also includes cationic hyaluronic acid.

[0075] Cationic hyaluronic acid contains at least one cationic moiety. The cationic moiety is -N +The cationic moiety may be a trialkylammonium group such as (CH3)3. The cationic moiety may contain at least one hydroxyl group. An example of a cationic group is -CH2-CH(OH)-CH2-N + (CH3)3 is an example.

[0076] An example of a cationic hyaluronic acid is hydroxypropyltrimonium hyaluronate.

[0077] Hyaluronic acid salts or hyaluronic acid derivative salts include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as magnesium salts, ammonium salts, and mixtures thereof.

[0078] The molecular weight of the hyaluronic acid component selected from the group consisting of hyaluronic acid, hyaluronic acid salts, hyaluronic acid derivatives, hyaluronic acid derivative salts, and mixtures thereof is not limited. The molecular weight of the hyaluronic acid component may be 5 kDa or more, preferably 20 kDa or more, and more preferably 100 kDa or more. The molecular weight of the hyaluronic acid component may be 20 MDa or less, preferably 10 MDa or less, and more preferably 2,000 kDa or less. Therefore, the molecular weight of the (b) hyaluronic acid component may be 5 kDa to 20 MDa, preferably 20 kDa to 10 MDa, and more preferably 100 kDa to 2,000 kDa.

[0079] Unless otherwise defined in the description, "molecular weight" may mean weight average molecular weight.

[0080] The hyaluronic acid component may specifically be hyaluronic acid supplied by Centipro under the trade name HyActive™ (Mw: 10-150 kDa), by Givaudan under the trade name Cristalhyal™ (registered trademark) (Mw: 1-1.4 MDa), by Bioland under the trade name Nutra™ HA (Mw: 907,600 Da), by Bioland under the trade name Nutra™ HAF (Mw: 74,600 Da), by Bioland under the trade name Oligo™ HA (Mw: 0.5-10.1 kDa), by Res Pharma under the trade name D-Factor™ (registered trademark) (Mw: 380 Da), or by Bloomage Freda Biopharm under the trade name Hybloom™ Sodium Hyaluronate (HA-T) (MW: 1,000 kDa-1,800 kDa).

[0081] A single hyaluronic acid component having a single molecular weight or a combination of two or more hyaluronic acid components having different molecular weights may be used as the hyaluronic acid component.

[0082] (b) The linear polysaccharide is preferably selected from hyaluronates, more preferably alkali metal hyaluronates, and even more preferably sodium hyaluronate.

[0083] The amount of (b) linear polysaccharide in the composition according to the present invention may be 0.01% by mass or more, preferably 0.05% by mass or more, more preferably 0.1% by mass or more, relative to the total mass of the composition.

[0084] On the other hand, the amount of (b) linear polysaccharide in the composition according to the present invention may be 5% by mass or less, preferably 3% by mass or less, and more preferably 1% by mass or less, relative to the total mass of the composition.

[0085] Therefore, the amount of (b) linear polysaccharide in the composition according to the present invention may be in the range of 0.01% by mass to 5% by mass, preferably 0.05% by mass to 3% by mass, and more preferably 0.1% by mass to 1% by mass, relative to the total mass of the composition.

[0086] (filling material) The composition according to the present invention comprises (c) at least one filler. A single type of filler may be used, or two or more different types of fillers may be used in combination.

[0087] The term "filler" should be understood to mean colorless or white inorganic or organic particles that are insoluble in the liquid components that may be present in the composition according to the invention, regardless of the temperature at which the composition is prepared.

[0088] (c) Fillers may be inorganic or organic, may have any crystalline form (e.g., lamellar, cubic, hexagonal, orthorhombic, etc.), and may be spherical or oval in shape. Examples include, but are not limited to, talc, mica, silica, silica silylate, kaolin, sericite, calcined talc, calcined mica, calcined sericite, synthetic mica, bismuth oxychloride, barium sulfate, boron nitride, calcium carbonate, magnesium carbonate, magnesium bicarbonate, and hydroxyapatite, powders formed from polyamide (Nylon®), poly-β-alanine, and polyethylene, powders formed from polyurethane, powders formed from tetrafluoroethylene polymers (Teflon®), lauryl lysine, starch, hollow polymeric microspheres, such as hollow microspheres of poly(vinylidene chloride) / acrylonitrile, such as Expancel® (Nobel Industrie), or hollow microspheres of acrylic acid copolymers, silicone resin microbeads (for example, Tospearls® from Toshiba), particles formed from polyorganosiloxane elastomers, precipitated calcium carbonate, magnesium carbonate, basic magnesium carbonate, hollow silica microspheres, glass or ceramic microcapsules, or metal soaps derived from organic carboxylic acids having 8 to 22 carbon atoms, for example 12 to 18 carbon atoms, such as zinc stearate, magnesium stearate, lithium stearate, zinc laurate or magnesium myristate.

[0089] In one embodiment, (c) the filler may be selected from inorganic fillers, preferably metal oxides, more preferably silica.

[0090] The term "mineral filler" should be understood herein to mean colorless or white inorganic particles that are insoluble in the liquid components that may be present in the composition according to the invention, regardless of the temperature at which the composition is prepared.

[0091] The inorganic filler may include metal oxides, preferably silica, titanium oxide, zinc oxide, and mixtures thereof.

[0092] Inorganic fillers suitable for the present invention may, for example, be fillers with an average particle size of less than 100 μm, in particular between 1 and 50 μm, for example between 4 and 20 μm.

[0093] (c) The filler may be hydrophilic or hydrophobic.

[0094] The term "hydrophilic" means that (c) the filler can be individually dispersed in water without forming agglomerates.

[0095] The term "hydrophobic" means that the inorganic filler can be dispersed individually in oil so that no agglomerates are formed.

[0096] Inorganic fillers are generally hydrophilic in nature, for example, metal oxides such as silica that have not undergone any surface treatment are hydrophilic.

[0097] In a preferred embodiment, (c) the filler is selected from hydrophobic inorganic fillers.

[0098] The hydrophobic inorganic filler may be porous or non-porous.

[0099] The hydrophobic inorganic filler may or may not be capable of absorbing (and / or adsorbing) oil or liquid fatty substances, such as sebum (from the skin). Preferably, the hydrophobic inorganic filler is capable of absorbing (and / or adsorbing) oil or liquid fatty substances, such as sebum (from the skin).

[0100] The hydrophobic inorganic filler may have an oil absorption capacity of 100 ml / 100 g or more, preferably 150 ml / 100 g or more, and more preferably 200 ml / 100 g or more.

[0101] The amount of oil absorbed (and / or adsorbed) by the hydrophobic inorganic filler can be determined as follows.

[0102] The amount of oil absorbed (and / or adsorbed) can be measured according to the method for determining the oil absorption of powders described in NF standard T 30-022. It corresponds to the amount of oil absorbed / adsorbed onto the available surface of the powder by measuring the wetting point Wp, and corresponds to the amount of oil that needs to be added to 100 g of powder to obtain a homogeneous paste.

[0103] An amount of powder m = 2 g is placed on a glass plate, and then oil (such as ester oil and silicone oil) is added dropwise. After adding 4-5 drops of oil to the powder, it is mixed using a spatula, and the addition of oil is continued until an agglomerate of oil and powder is formed. At this point, the oil is added drop by drop, and then the mixture is ground with the spatula. When a firm, smooth paste is obtained, the addition of oil is stopped. This paste should be able to be spread on the glass plate without cracking or forming lumps. The volume Vs (expressed in ml) of the oil used is then noted. The oil absorption corresponds to the Vs / m ratio.

[0104] Alternatively, oil absorption capacity can be measured according to JIS-K6217-4.

[0105] The hydrophobic inorganic filler may have at least one inorganic core and at least one hydrophobic coating.

[0106] The inorganic core may comprise at least one material selected from the group consisting of silica, silicates, perlite, boron nitride, magnesium carbonate, magnesium hydroxide, titanium oxide, zinc oxide, kaolin, talc, and mixtures thereof.

[0107] The hydrophobic coating can be formed by a hydrophobic treating agent which can be selected in particular from fatty acids such as stearic acid; metal soaps such as aluminum dimyristate, aluminum salt of hydrogenated tallow glutamic acid; amino acids; N-acyl amino acids or salts thereof; lecithin, isopropyl triisostearyl titanate, inorganic waxes, and mixtures thereof.

[0108] The N-acylamino acid may contain an acyl group containing 8 to 22 carbon atoms, such as 2-ethylhexanoyl, caproyl, lauroyl, myristoyl, palmitoyl, stearoyl, or cocoyl. Salts of these compounds may be aluminum, magnesium, calcium, zirconium, zinc, sodium, or potassium salts. The amino acid may be, for example, lysine, glutamic acid, or alanine.

[0109] The term "alkyl" mentioned in the above compounds denotes in particular alkyl groups containing 1 to 30 carbon atoms, preferably 5 to 16 carbon atoms.

[0110] Preferably, the hydrophobic inorganic filler is selected from hydrophobically modified metal oxides, more preferably from silica, titanium oxide, zinc oxide, and mixtures thereof. The hydrophobically modified metal oxide may have at least one hydrophobic coating on the metal oxide particles.

[0111] Preferably, the hydrophobic inorganic filler may be selected from hydrophobic silicas, especially silica silylate.

[0112] The term "hydrophobic silica" is understood to mean any silica particle whose surface has been treated to make it hydrophobic. Hydrophobic silica or hydrophobic silica particles may have at least one hydrophobic coating on the silica particle.

[0113] Preferably, the hydrophobic inorganic filler is selected from hydrophobic silica, more preferably from hydrophobic silica aerogel particles, even more preferably from hydrophobic aerogels of silica silylate.

[0114] Hydrophobic silica, especially silica silylate, may be based on silica aerogel, a porous material obtained by replacing the liquid component of silica gel with air (by drying).

[0115] They are generally synthesized via the sol-gel method in a liquid medium and then dried, usually by extraction with a supercritical fluid, the most commonly used being supercritical CO2. This type of drying makes it possible to avoid pore and material shrinkage. The sol-gel method and various drying procedures are described in detail in Brinker CJ and Scherer GW, Sol-Gel Science, New York, Academic Press, 1990.

[0116] Aerogels are highly porous materials. In this specification, silica aerogel generally refers to solid silica with a porous structure obtained by drying wet silica gel while maintaining the solid silica network, thereby replacing the media contained in the wet silica gel with air. Porosity is expressed as the amount of air contained in the apparent volume of the material, expressed as a volume percentage. The hydrophobic silica aerogel of the present invention can have a porosity of 60% or more, preferably 70% or more, and more preferably 80% or more.

[0117] Hydrophobic silica aerogel particles are 500~1,500m 2 / g, preferably 600 to 1,200m 2 / g, more preferably 600 to 800m 2 Specific surface area (SW) per mass unit in the range / g, and / or A size expressed as a volume average diameter (D[0.5]) in the range of 1 to 1,500 μm, preferably 1 to 1,000 μm, more preferably 1 to 100 μm, in particular 1 to 30 μm, even more preferably 5 to 25 μm, even more preferably 5 to 20 μm, and even more preferably 5 to 15 μm. can be presented.

[0118] The specific surface area per mass unit can be determined by a nitrogen absorption method known as the BET (Brunauer-Emmett-Teller) method, which is described in The Journal of the American Chemical Society, Vol. 60, p. 309, February 1938, and corresponds to International Standard ISO 5794 / 1 (Annex D). The BET specific surface area corresponds to the total specific surface area of ​​the particles under consideration.

[0119] The size of hydrophobic silica aerogel particles can be measured by static light scattering using a commercially available particle size analyzer, the Malvern MasterSizer 2000. Data are processed based on the Mie scattering theory, which is accurate for isotropic particles and allows the determination of the "effective" particle size for non-spherical particles. This theory is described in detail in Van de Hulst, H.C., "Light Scattering by Small Particles," Chapters 9 and 10, Wiley, New York, 1957.

[0120] The hydrophobic silica aerogel particles are advantageously 0.04 g / cm 3 ~0.10g / cm 3 , preferably 0.05 g / cm 3 ~0.08g / cm 3 It can exhibit a packing density (r) in the range of

[0121] In the context of the present invention, this density, known as packing density, can be assessed according to the following protocol: Pour 40g of powder into a graduated cylinder; The graduated cylinder is then placed in a Stampf Volumeter Stav 2003 device; The graduated cylinder is subsequently subjected to a series of 2500 filling operations (this operation is repeated until the volume difference between two consecutive tests is less than 2%); The final volume Vf of the packed powder is then measured directly in the measuring cylinder. The packing density is determined by the w / Vf ratio (Vf is cm), which in this case is 40 / Vf. 3 and w is expressed as g).

[0122] For the preparation of hydrophobic silica aerogel particles surface-modified by silylation, reference may be made to US Pat. No. 7,470,725.

[0123] In particular, hydrophobic silica aerogel particles that are surface-modified with trimethylsilyl groups are used.

[0124] Hydrophobic inorganic fillers that may be mentioned include polydimethylsiloxane-coated amorphous silica microspheres, in particular those sold under the names Sunsphere® H33 and Sunsphere® H53 (oil absorption equal to 400 ml / 100 g), precipitated silica powders surface-treated with inorganic waxes, such as precipitated silica treated with polyethylene waxes, in particular those sold under the name Acematt OR 412 by Evonik-Degussa (oil absorption equal to 398 ml / 100 g), and silica silylate sold under the name VM-2270 by Dow (oil absorption equal to 1,040 ml / 100 g).

[0125] As hydrophobic inorganic filler, it is preferred to use silica silylate sold under the name VM-2270 by Dow, the particles of which have an average size in the range of 5 to 15 μm and a thickness of 600 to 800 μm. 2The specific surface area per mass unit in the range of / g is shown.

[0126] The hydrophobic silica aerogel particles can be characterized by the spherical shape of each particle. This spherical shape allows the hydrophobic silica aerogel particles to provide good smoothness to cosmetic compositions. The sphericity of the hydrophobic silica aerogel can be determined by the average circularity.

[0127] The spherical hydrophobic silica aerogel particles may have an average circularity of 0.8 or more, preferably 0.82 or more. The spherical hydrophobic silica aerogel may have an average circularity of less than 1, preferably 0.99 or less, more preferably 0.98 or less, even more preferably 0.97 or less, even more preferably 0.96 or less, and most preferably 0.95 or less.

[0128] The "average circularity" can be determined by image analysis. In particular, the "average circularity" can be the arithmetic mean of the circularities obtained by image analysis of scanning electron microscope (SEM) images of 2,000 or more aerogel particles observed at 1,000 magnification by secondary electron detection using a scanning electron microscope (SEM).

[0129] The "roundness" of each aerogel particle is calculated using the following formula: C=4πS / L 2 (In the formula, C represents the circularity, S represents the area (projected area) of the aerogel particle in the image, and L represents the perimeter (outer perimeter) of the aerogel particle in the image.) The closer the average circularity is to 1, the more spherical the shape of each particle becomes.

[0130] The hydrophobic silica aerogel particles that can be used as the hydrophobic inorganic filler according to the present invention are preferably silylated silica type (INCI name: silica silylate).Preferably, the hydrophobic silica aerogel particles may be those described in JP-A-2014-088307, JP-A-2014-218433, or JP-A-2018-177620.

[0131] It is preferable to use a hydrophobic aerogel of silica silylate as the inorganic hydrophobic oil-absorbing powder.

[0132] The hydrophobicity of the silica silylate aerogel is determined by adding a hydrophobizing agent having the following formula present on the surface of the silica: ≡Si-OH (wherein the symbol "≡" represents the remaining valence of 3 on the Si atom) thereby converting the silanol group to the following formula: (≡Si-O-) (4-n) SiR n (wherein n is an integer of 1 to 3, each R is independently a hydrocarbyl group, two or more Rs may be the same or different, and n is 2 or more). can be obtained by converting the group represented by the formula:

[0133] The hydrophobizing agent may be a silylating agent. Thus, according to a preferred embodiment, in the hydrophobic aerogel of silica silylate, the silica particles may be surface-modified by silylation. Examples of the silylating agent include a treatment agent having one of the following formulas (1) to (3):

[0134] Formula (1): R n Six (4-n) (wherein n represents an integer of 1 to 3, R represents a hydrocarbyl group, X represents a group that can be eliminated from the molecule by cleaving the bond to the Si atom during reaction with a compound having a hydroxyl group (i.e., a leaving group), each R may be different, n is 2 or more, and each X may be different, and n is 2 or less).

[0135] Formula (2):

[0136] [ka]

[0137] (In the formula, R 1 represents an alkylene group, and R 2 and R 3 each independently represents a hydrocarbyl group; R 4 and R 5 independently represent a hydrogen atom or a hydrocarbyl group).

[0138] Formula (3):

[0139] [ka]

[0140] (In the formula, R 6 and R 7 each independently represents a hydrocarbyl group, m represents an integer of 3 to 6, and R 6 If there are two or more R 6 may be different, and R 7 If there are two or more R 7 may be different).

[0141] In the above formula (1), R is a hydrocarbyl group, preferably a hydrocarbyl group having 1 to 10 carbon atoms, more preferably a hydrocarbyl group having 1 to 4 carbon atoms, and particularly preferably a methyl group.

[0142] Examples of the leaving group represented by X include halogen atoms such as chlorine and bromine; alkoxy groups such as methoxy and ethoxy; and groups represented by -NH-SiR3 (wherein R is defined as the same as R in formula (1)).

[0143] Specific examples of the hydrophobizing agent represented by the above formula (1) include chlorotrimethylsilane, dichlorodimethylsilane, trichloromethylsilane, monomethyltrimethoxysilane, monomethyltriethoxysilane, and hexamethyldisilazane.

[0144] Most preferably, in view of favorable reactivity, chlorotrimethylsilane, dichlorodimethylsilane, trichloromethylsilane, and / or hexamethyldisilazane may be used.

[0145] The number of bonds between the Si atom and the silanol groups on the silica backbone varies depending on the number of leaving groups X (4-n). For example, when n is 2, the following bonds are formed: (≡Si-O-)2SiR2 occurs.

[0146] If n is 3, the following combination: ≡Si-O-SiR3 occurs.

[0147] In this way, the silanol groups can be silylated and thereby hydrophobized.

[0148] In the above formula (2), R 1 may be an alkylene group, preferably an alkylene group having 2 to 8 carbon atoms, particularly preferably an alkylene group having 2 to 3 carbon atoms.

[0149] In the above formula (2), R 2 and R 3 are independently hydrocarbyl groups, and the same preferred groups as those of R in formula (1) can be mentioned. 4 represents a hydrogen atom or a hydrocarbyl group, and when it is a hydrocarbyl group, the same preferred groups as those for R in formula (1) can be mentioned. When silica gel is treated with a compound (cyclic silazane) represented by formula (2), the reaction with the silanol groups causes cleavage of the Si-N bond, and therefore the following bond is formed on the surface of the silica skeleton in the gel: (≡Si-O-)2SiR 2 R 3 occurs

[0150] In this way, the silanol groups can also be silylated with the cyclic silazane of formula (2) above, thereby achieving hydrophobization.

[0151] Specific examples of the cyclic silazane represented by the above formula (3) include hexamethylcyclotrisilazane and octamethylcyclotetrasilazane.

[0152] In the above formula (3), R 6 and R 7 are independently hydrocarbyl groups, and the same preferred groups as R in formula (2) can be mentioned. In formula (3), m represents an integer of 3 to 6. When silica gel is treated with a compound (cyclic siloxane) represented by formula (3), the following bonds are formed on the surface of the silica skeleton in the gel: (≡Si-O-)2SiR 6 R 7 occurs.

[0153] In this way, the silanol groups can also be silylated with the cyclic siloxane of formula (3) above, thereby achieving hydrophobicity.

[0154] Specific examples of the cyclic siloxane represented by the above formula (3) include hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, and decamethylcyclopentasiloxane.

[0155] Silica silylate hydrophobic aerogels can be prepared by producing a silica sol, converting the sol to a gel, aging the gel, washing the aged gel, replacing the water in the washed gel with a solvent, treating the gel with a hydrophobizing agent, and drying the hydrophobized silica.

[0156] The specific surface area of ​​the silica silylate hydrophobic aerogel determined by the BET method is 200 m 2 / g or more, preferably 400m 2 / g or more, more preferably 500m 2 / g or more, and 2 / g or less, preferably 1,000m 2 / g or less, more preferably 800m 2 / g or less.

[0157] The pore volume of the silica silylate hydrophobic aerogel, as determined by the BJH method, may be 1 ml / g or more, preferably 2 ml / g or more, more preferably 3 ml / g or more, and may be 10 ml / g or less, preferably 8 ml / g or less, more preferably 7 ml / g or less.The peak pore radius of the silica silylate hydrophobic aerogel, as determined by the BJH method, may be 5 nm or more, preferably 10 nm or more, more preferably 12 nm or more, and may be 50 nm or less, preferably 40 nm or less, more preferably 30 nm or less.

[0158] "Pore volume determined by the BJH method" refers to the pore volume derived from pores with a pore radius of 1 nm to 100 nm, obtained by analyzing the nitrogen adsorption isotherm obtained by the BJH method (Barrett, EP; Joyner, LG; Halenda, PP, J. Am. Chem. Soc. 73, 373 (1951)) in the same manner as described above in "Specific surface area determined by the BET method." "Peak pore radius determined by the BJH method" refers to the pore radius value that produces a peak in a pore distribution curve (volume distribution curve) plotted on the horizontal axis against the vertical axis, which is the derivative of the cumulative pore volume with respect to the logarithm of the pore radius, obtained by analyzing the nitrogen adsorption isotherm obtained by the BJH method in the same manner as above.

[0159] The silica silylate hydrophobic aerogel may have an average particle size of 0.5 μm or more, preferably 1 μm or more, more preferably 2 μm or more, and may have an average particle size of 30 μm or less, preferably 20 μm or less, more preferably 15 μm or less, as measured by image analysis.

[0160] The "average particle size" here can be measured by image analysis. In particular, the "average particle size" value is the arithmetic mean of the equivalent circular diameters, which can be obtained by image analysis of a scanning electron microscope (SEM) image of 2,000 or more aerogel particles observed at 1,000x magnification using secondary electron detection. The "equivalent circular diameter" of each aerogel particle is the diameter of a circle having an area equal to the area (projected area) of the aerogel particle in the image.

[0161] Preferably, the oil absorption capacity of the silica silylate hydrophobic aerogel, which can be measured at the wet point as described above, may be 2 ml / g or more, preferably 3 ml / g or more, more preferably 4 ml / g or more, most preferably 5 ml / g or more, and may be 12 ml / g or less, preferably 10 ml / g or less, more preferably 8 ml / g or less, most preferably 7 ml / g or less.

[0162] (c) The filler, especially the hydrophobic inorganic filler, is preferably selected from hydrophobically modified metal oxides, more preferably from hydrophobic silicas, and even more preferably from silica silylate.

[0163] The amount of (c) filler in the composition according to the present invention may be 0.01% by mass or more, preferably 0.05% by mass or more, and more preferably 0.1% by mass or more, based on the total mass of the composition.

[0164] On the other hand, the amount of (c) filler in the composition according to the present invention may be 5% by mass or less, preferably 3% by mass or less, more preferably 1.5% by mass or less, based on the total mass of the composition.

[0165] Therefore, the amount of the filler (c) in the composition according to the present invention may be in the range of 0.01% by mass to 5% by mass, preferably 0.05% by mass to 3% by mass, and more preferably 0.1% by mass to 1.5% by mass, relative to the total mass of the composition.

[0166] (branched polysaccharide) The composition according to the present invention may comprise (d) at least one branched polysaccharide. When two or more branched polysaccharides are used, they may be the same or different.

[0167] The term "branched," as used herein in reference to a polysaccharide, means that the polysaccharide has at least one side chain or branch containing at least one saccharide.

[0168] (d) The branched polysaccharide may be selected from any conventional branched polysaccharide used in the cosmetic field.

[0169] (d) The branched polysaccharides may be present in the aqueous phase of the composition according to the present invention when the composition according to the present invention comprises water, and may function as a hydrophilic thickener capable of thickening the aqueous phase of the composition according to the present invention.

[0170] In one embodiment, the branched polysaccharide (d) may be a heteropolysaccharide. As used herein, the term "heteropolysaccharide" refers to a polysaccharide composed of two or more types of monosaccharides. In one embodiment, the branched polysaccharide (d) is selected from heteropolysaccharides composed of at least two components selected from glucose, galactose, mannose, xylose, rhamnose, arabinose, and glucuronic acid.

[0171] According to one embodiment, the composition according to the invention may comprise at least one branched polysaccharide chosen from galactomannans.

[0172] According to another embodiment, the composition according to the invention may comprise at least one branched polysaccharide selected from xanthan gum, tamarind gum, karaya gum, tragacanth gum, gum arabic, branched dextrins, and succinoglycan.

[0173] In certain embodiments, (d) the branched polysaccharide may be selected from locust bean gum and xanthan gum, with xanthan gum being preferred.

[0174] Xanthan gum is a branched heteropolysaccharide produced on an industrial scale by aerobic fermentation of the bacterium Xanthomonas campestris. Its structure consists of a β(1,4)-linked β-D-glucose backbone. One of every two glucose molecules carries a trisaccharide side chain composed of α-D-mannose, β-D-glucuronic acid, and a terminal β-D-mannose. The internal mannose residues are generally acetylated at carbon 6. Approximately 30% of the terminal mannose residues carry a pyruvate group linked in a chelate form between carbons 4 and 6. Glucuronic acid and charged pyruvate are ionizable, contributing to the anionic nature of xanthan (negative charge up to pH 1). The content of pyruvate and acetate residues varies depending on the strain, fermentation process, post-fermentation conditions, and purification steps. These groups are present in commercial products, including Na. + , K. + or Ca 2+ The neutralized form can be converted to the acid form by ion exchange or by dialysis of an acidic solution.

[0175] Xanthan gum is 1 x 10 6 From 5 x 10 7 and a viscosity of between 0.6 and 1.65 Pa·s for an aqueous composition containing 1% xanthan gum (measured at 25°C and 60 revolutions per minute using a Brookfield viscometer (LVT type). A typical structure of xanthan gum is shown below:

[0176] [ka]

[0177] The amount of (d) branched polysaccharide in the composition according to the present invention may be 0.01% by mass or more, preferably 0.05% by mass or more, more preferably 0.1% by mass or more, relative to the total mass of the composition.

[0178] On the other hand, the amount of (d) branched polysaccharide in the composition according to the present invention may be 5% by mass or less, preferably 3% by mass or less, and more preferably 1% by mass or less, relative to the total mass of the composition.

[0179] The amount of (d) branched polysaccharide in the composition according to the present invention may be in the range of 0.01% to 5% by mass, preferably 0.05% to 3% by mass, and more preferably 0.1% to 1% by mass, relative to the total mass of the composition.

[0180] (water) The composition according to the present invention may also comprise (e) water.

[0181] The amount of (e) water in the composition according to the present invention may be 50% by mass or more, preferably 60% by mass or more, and more preferably 70% by mass or more, based on the total mass of the composition.

[0182] On the other hand, the amount of (e) water in the composition according to the present invention may be 99% by mass or less, preferably 98% by mass or less, and more preferably 97% by mass or less, based on the total mass of the composition.

[0183] Therefore, the amount of (e) water in the composition according to the present invention may be in the range of 50% by mass to 99% by mass, preferably 60% by mass to 98% by mass, and more preferably 70% by mass to 97% by mass, relative to the total mass of the composition.

[0184] (Other optional ingredients) The compositions according to the invention may also contain effective amounts of other optional ingredients previously known elsewhere in cosmetic compositions, such as silicones; sequestering or chelating agents; preservatives and co-preservatives; vitamins or provitamins, fragrances; plant extracts, etc.

[0185] The composition according to the present invention may further comprise at least one organic solvent, which is preferably water-miscible. Examples of the organic solvent include C1-C4 alkanols, such as ethanol and isopropanol; aromatic alcohols, such as benzyl alcohol and phenoxyethanol; similar products; and mixtures thereof.

[0186] The organic water-soluble solvent may be present in an amount ranging from 0.01% by weight or more, preferably from 0.1% by weight or more, more preferably from 1% by weight or more, relative to the total weight of the composition according to the invention.

[0187] The organic water-soluble solvent may be present in an amount ranging up to 15% by weight, preferably up to 10% by weight, more preferably up to 5% by weight relative to the total weight of the composition according to the invention.

[0188] The organic water-soluble solvent may be present in an amount ranging from 0.01% to 15% by weight, preferably from 0.1% to 10% by weight, more preferably from 1% to 5% by weight, relative to the total weight of the composition according to the invention.

[0189] The compositions according to the present invention may contain limited amounts of oils, such as hydrocarbon oils.

[0190] The amount of oil in the composition according to the invention may be at most 1% by weight, preferably at most 0.5% by weight, more preferably at most 0.1% by weight, relative to the total weight of the composition. It may be particularly preferred that the composition according to the invention is oil-free.

[0191] Compositions according to the present invention may contain limited amounts of surfactants such as polyglyceryl fatty acid esters.

[0192] The amount of surfactant in the composition according to the invention may be up to 1% by weight, preferably up to 0.5% by weight, more preferably up to 0.1% by weight, relative to the total weight of the composition. It may be particularly preferred that the composition according to the invention is free of surfactant.

[0193] According to a preferred embodiment, the composition according to the invention comprises, relative to the total weight of the composition: 0.01% by mass to 5% by mass of polyglutamic acid or sodium polyglutamate as component (a); 0.01% by mass to 5% by mass of a hyaluronic acid salt as component (b); 0.01% by mass to 5% by mass of an inorganic filler as component (c); Includes.

[0194] According to a more preferred embodiment, the composition according to the invention comprises, relative to the total weight of the composition: 0.05% by mass to 3% by mass of sodium polyglutamate as component (a); 0.05% to 3% by weight of sodium hyaluronate as component (b); 0.05% by weight to 3% by weight of a hydrophilic and / or hydrophobic metal oxide as component (c); Includes.

[0195] According to an even more preferred embodiment, the composition according to the invention comprises, relative to the total weight of the composition: 0.1% by mass to 1% by mass of sodium polyglutamate as component (a); 0.1% to 1% by weight of sodium hyaluronate as component (b); 0.1% by weight to 1% by weight of hydrophilic and / or hydrophobic silica as component (c); Includes.

[0196] (preparation) The composition according to the present invention can be prepared by mixing the essential components described above and the optional components (if necessary) described above.

[0197] The method and means for mixing the above essential components and optional components are not limited. Any conventional method and means can be used to mix the above essential components and optional components to prepare the composition according to the present invention. Conventional methods and means include a homogenizer, such as a turbine mixer.

[0198] (form) Compositions according to the invention may be in a variety of forms.

[0199] The composition according to the invention may be in the form of a fluid, such as a liquid or a gel, at room temperature (25° C.) and atmospheric pressure (760 mm Hg or 101325 Pa).

[0200] (pH) The pH of the composition according to the present invention may be less than 7.0, preferably less than 6.5, more preferably less than 6.0.

[0201] The pH of the composition according to the present invention may be 3.0 or higher, preferably 3.5 or higher, more preferably 4.0 or higher.

[0202] For example, the pH of the composition according to the present invention may be from 3.0 to less than 7.0, preferably from 3.5 to less than 6.5, and more preferably from 4.0 to less than 6.0.

[0203] The pH of the composition according to the invention can be adjusted by adding at least one alkaline agent and / or at least one acid or its salt. The pH of the composition according to the invention can also be adjusted by adding at least one buffering agent.

[0204] [Method, Coating and Use] Preferably, the composition according to the present invention is a cosmetic composition, more preferably a cosmetic composition for keratinous materials such as the skin.

[0205] The composition according to the present invention is suitable as a skin care cosmetic composition, for example, it can be used to lighten and / or moisturize the skin.

[0206] The composition according to the present invention is preferably a leave-on type, in other words, it is preferably used on keratinous materials such as the skin without rinsing, and therefore it is preferable that the composition according to the present invention is not a cleansing composition.

[0207] The present invention also relates to a cosmetic method for keratinous materials such as the skin, which comprises the step of applying a composition according to the present invention to the keratinous materials.

[0208] Cosmetic method means herein a non-therapeutic cosmetic method for caring for and / or making up the surfaces of keratinous materials such as the skin, preferably a non-therapeutic cosmetic method for caring for the skin.

[0209] The cosmetic method according to the present invention is preferably not a cleansing method, and therefore preferably does not include a step of rinsing the composition according to the present invention from keratinous materials such as skin.

[0210] The present invention also provides a method for preparing a film, preferably a cosmetic film, comprising the steps of: applying a composition according to the present invention onto a keratinous material such as skin; drying the composition; The present invention may also relate to a method, including:

[0211] The present invention also provides a film, preferably a cosmetic film, comprising: (a) at least one polyamino acid or a salt thereof; (b) at least one linear polysaccharide; (c) at least one filler; It may also relate to a coating comprising:

[0212] The present invention also provides (a) at least one polyamino acid or a salt thereof; (b) at least one linear polysaccharide; (c) the use of at least one filler in a composition comprising The present invention may also relate to the use of the composition so that it can form a non-transparent film, preferably a semi-transparent or opaque film, more preferably a semi-transparent film.

[0213] The above explanations regarding (a) polyamino acid or a salt thereof, (b) linear polysaccharide, and (c) filler for the composition according to the present invention can be applied to the coating or use described above. [Example]

[0214] The present invention will now be described in more detail by way of examples, which should not be construed as limiting the scope of the invention.

[0215] (Examples 1 to 4 and Comparative Examples 1 and 2) [Preparation] The following compositions according to Examples 1-4 and Comparative Examples 1-2 shown in Table 1 were prepared by mixing the components shown in Table 1. All numerical values ​​for the amounts of components shown in Table 1 are based on "mass %" of the active ingredient. The symbols (a)-(e) in Table 1 correspond to components (a)-(e) in the claims.

[0216] [Table 1]

[0217] [evaluation] (Transparency of the film) Each of the compositions according to Examples 1 to 4 and Comparative Examples 1 and 2 was cast onto a glass substrate and dried at room temperature (25°C) to prepare a film. The transparency of the prepared film was visually evaluated according to the following criteria, where the transparency of the film prepared from the composition according to Example 1 was set as the reference or standard. 5: Not transparent (very opaque) 4: Less transparent than the reference (no transparency) 3: Referential (no transparency) 2: More transparent than the reference (less transparent) 1: Highly transparent (very transparent)

[0218] The results are shown in Table 1.

[0219] (summary) The compositions according to Examples 1 to 4 were capable of preparing films that were not transparent (eg, the films were translucent) and were capable of lightening keratinous materials such as skin.

[0220] A comparison of Examples 1 and 2 demonstrates that the use of a hydrophobic filler (silica silylate) in the composition can further reduce the transparency of the film.

[0221] A comparison of Examples 1 and 3 demonstrates that the use of a polysaccharide (xanthan gum) in the composition can further reduce the transparency of the film.

[0222] Comparative Examples 1 and 2 demonstrate that compositions containing only polyglutamic acid (salt) or hyaluronic acid (salt) can produce very transparent films and are unable to lighten keratinous materials such as skin.

Claims

1. (a) at least one polyamino acid or a salt thereof; (b) at least one linear polysaccharide; (c) at least one filler; A composition, preferably a cosmetic composition, more preferably a dermocosmetic composition, comprising:

2. 2. The composition according to claim 1, wherein the viscosity of a 1% by mass aqueous solution of (b) the linear polysaccharide is at least 10 times higher than the viscosity of a 1% by mass aqueous solution of (a) the polyamino acid or a salt thereof.

3. 3. The composition according to claim 1, wherein the polyamino acid is selected from polyglutamic acid.

4. The composition according to any one of claims 1 to 3, wherein the amount of (a) polyamino acid or salt thereof in the composition is in the range of 0.01% by mass to 5% by mass, preferably 0.05% by mass to 3% by mass, and more preferably 0.1% by mass to 1% by mass, relative to the total mass of the composition.

5. 5. The composition according to claim 1, wherein the linear polysaccharide (b) is selected from the group consisting of hyaluronic acid, hyaluronic acid salts, hyaluronic acid derivatives, hyaluronic acid derivative salts, and mixtures thereof.

6. 6. The composition according to claim 1, wherein the (b) linear polysaccharide is selected from hyaluronates, preferably alkali metal hyaluronates, more preferably sodium hyaluronate.

7. 7. The composition according to any one of claims 1 to 6, wherein the amount of (b) linear polysaccharide in the composition is in the range of 0.01% by weight to 5% by weight, preferably 0.05% by weight to 3% by weight, and more preferably 0.1% by weight to 1% by weight, relative to the total weight of the composition.

8. 8. The composition according to claim 1, wherein the (c) filler is selected from inorganic fillers, preferably metal oxides, more preferably silica.

9. 9. The composition according to any one of claims 1 to 8, wherein (c) the filler is selected from hydrophobic inorganic fillers, preferably hydrophobically modified metal oxides, more preferably hydrophobically modified silica, zinc oxide, and mixtures thereof.

10. 10. The composition according to any one of claims 1 to 9, wherein (c) the filler is selected from hydrophobic silica, preferably from hydrophobic silica aerogel particles, more preferably from hydrophobic aerogel particles of silica silylate.

11. The composition according to any one of claims 1 to 10, wherein the amount of (c) filler in the composition is in the range of 0.01% to 5% by weight, preferably 0.05% to 3% by weight, and more preferably 0.1% to 1.5% by weight, relative to the total weight of the composition.

12. 12. The composition of claim 1, further comprising (d) at least one branched polysaccharide.

13. 13. The composition of claim 12, wherein the branched polysaccharide is selected from glucose, galactose, mannose, xylose, rhamnose, arabinose, and glucuronic acid, preferably xanthan gum, locust bean gum, tamarind gum, karaya gum, tragacanth gum, gum arabic, branched dextrins, succinoglycan, and mixtures thereof, more preferably a heteropolysaccharide consisting of at least two components selected from the group consisting of locust bean gum, xanthan gum, and mixtures thereof.

14. The composition according to claim 12 or 13, wherein the amount of (d) branched polysaccharide in the composition is in the range of 0.01% by weight to 5% by weight, preferably 0.05% by weight to 3% by weight, and more preferably 0.1% by weight to 1% by weight, relative to the total weight of the composition.

15. A cosmetic method for treating keratinous materials such as the skin, comprising the step of applying a composition according to any one of claims 1 to 14 onto the keratinous material.

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