Water-based emulsion for aqueous cosmetic compositions containing polyhydroxy acids

Abstract

To provide a novel aqueous formulation for cosmetic use in which cosmetic active substances are well dispersed in emulsion form. [Solution] The present invention relates to an aqueous-water emulsion composition comprising a plurality of internal aqueous droplets dispersed in a continuous aqueous phase, wherein (a) at least one polyhydroxy acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition, (b) at least one fatty acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition, (c) at least one polyvalent metal salt in an amount ranging from 2% to 20% by mass relative to the total mass of the composition, and (d) at least one polysaccharide, wherein (d) the polysaccharide is configured to disperse the internal aqueous droplets in the continuous aqueous phase. The composition according to the present invention is very suitable for use in a variety of cosmetics.

Description

[Technical Field]

[0001] The present invention relates to an aqueous emulsion composition comprising at least one polyhydroxy acid, and more particularly to an aqueous emulsion composition comprising the same acid for cosmetic use. In addition, the present invention relates to a method for producing the same composition and cosmetics. [Background technology]

[0002] In recent years, compositions containing microcapsules have been developed for various advantages. For example, WO2021 / 240271 discloses a wound dressing composition comprising approximately 20% to 95% by mass of collagen having a mass-average molecular weight of approximately 5,000 to 100,000, approximately 20% to 70% by mass of oxidized regenerated cellulose (ORC) having a mass-average molecular weight of approximately 50,000 to 1,000,000, and microcapsules containing a drug encapsulated within a polymer.

[0003] Furthermore, the formulations of environmentally friendly cosmetics are designed and developed with environmental issues in mind, and this is an important goal in efforts to address global problems. Therefore, it is essential to propose more sustainable compositions, preparation methods, and ingredients in order to address these environmental challenges.

[0004] In this context, it is important to develop novel cosmetic compositions with a better carbon footprint by reducing the use of petrochemical compounds, and in particular by promoting the use of renewable raw materials and / or materials with a good naturalness index and / or materials of natural origin, more specifically plant-derived materials.

[0005] There remains a need to provide novel aqueous formulations for cosmetic use in which cosmetic active ingredients are well dispersed in emulsion form. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] WO2021 / 240271 [Patent Document 2] French Patent No. 1492597 [Patent Document 3] U.S. Patent No. 4,131,576 [Patent Document 4] U.S. Patent No. 3589578 [Patent Document 5] U.S. Patent No. 4031307 [Non-Patent Document]

[0007] [Non-Patent Document 1] "Encyclopedia of Chemical Technology", Kirk-Othmer, 3rd Edition, 1982, Volume 3, pp. 896 - 900, and Volume 15, pp. 439 - 458 [Non-Patent Document 2] "Polymers in Nature" by E. A. MacGregor and C. T. Greenwood, published by John Wiley & Sons, Chapter 6, pp. 240 - 328, 1980 [Non-Patent Document 3] "Industrial Gums - Polysaccharides and their Derivatives", edited by Roy L. Whistler, 2nd Edition, published by Academic Press Inc. [Summary of the Invention] [Problems to be Solved by the Invention]

[0008] An object of the present invention is to provide a new aqueous formulation for cosmetic use in which a cosmetic active substance is well dispersed in an emulsion form. [Means for Solving the Problems]

[0009] The object of the present invention is an aqueous emulsion composition comprising a plurality of internal aqueous droplets dispersed in a continuous aqueous phase, (a) At least one polyhydroxy acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition (b) At least one fatty acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition, (c) At least one polyvalent metal salt in an amount ranging from 2% to 20% by mass relative to the total mass of the composition, (d) at least one polysaccharide Includes, (d) At least one polysaccharide is configured to disperse the internal aqueous droplets in a continuous aqueous phase, This can be achieved by composition.

[0010] (a) At least one polyhydroxy acid may be selected from lactones.

[0011] (a) At least one polyhydroxy acid may be selected from gluconolactone, ribonolactone, and mixtures thereof.

[0012] (b) At least one fatty acid may be selected from short-chain fatty acids and salts thereof that contain 1 to 6 carbon atoms.

[0013] (b) At least one fatty acid may be selected from propionic acid, butyric acid, valeric acid and salts thereof, and mixtures thereof.

[0014] (c) At least one polyvalent metal salt may be selected from divalent metal salts.

[0015] (c) At least one polyvalent metal salt may be selected from calcium salts, such as calcium chloride, calcium pyrrolidone carboxylate (PCA), calcium acetate, calcium aspartate, calcium lactate, and mixtures thereof.

[0016] (d) At least one polysaccharide may be selected from anionic polysaccharides.

[0017] (d) At least one polysaccharide may be selected from xanthan gum, gellan gum, gum arabic, alginic acid, alginate, hyaluronic acid and its salts, and combinations thereof.

[0018] (d) At least one polysaccharide may be present in an amount of 0.05% to 3% by mass, preferably 0.1% to 2% by mass, and more preferably 0.2% to 1.5% by mass, relative to the total mass of the composition.

[0019] The internal aqueous droplet may contain (a) at least one polyhydroxy acid, (b) at least one fatty acid, and (c) a polyvalent metal salt.

[0020] Internal aqueous droplets are present in the composition in an amount ranging from 10% to 90% by mass, preferably 20% to 80% by mass, and more preferably 30% to 70% by mass, relative to the total mass of the composition.

[0021] The composition may be a premixed composition for cosmetic use.

[0022] The present invention also relates to a method for preparing an aqueous emulsion composition according to the present invention, (i) A step of preparing a two-phase aqueous composition by mixing (a) at least one polyhydroxy acid, (b) at least one fatty acid, and (c) at least one polyvalent metal salt. (ii)(d) A step of adding a polysaccharide to a two-phase aqueous composition, (iii) A step of emulsifying a two-phase aqueous composition to obtain an aqueous emulsion composition containing a plurality of internal aqueous droplets dispersed in a continuous aqueous phase. This also includes methods.

[0023] The present invention also relates to a method for preparing a cosmetic composition, comprising the step of mixing the aqueous-in-water emulsion composition according to the present invention with other components contained in the cosmetic composition. [Modes for carrying out the invention]

[0024] As a result of diligent research, the inventors surprisingly discovered that liquid-liquid separation occurs when (a) at least one polyhydroxy acid, (b) at least one fatty acid, and (c) at least one polyvalent metal salt are combined within a certain range of amounts. Subsequently, the inventors surprisingly discovered that an aqueous-in-water emulsion formulation can be prepared by adding (d) a polysaccharide to the aqueous composition in which liquid-liquid separation occurs, thereby completing the present invention.

[0025] Therefore, the present invention relates to an aqueous emulsion composition comprising a plurality of internal aqueous droplets dispersed in a continuous aqueous phase, (a) At least one polyhydroxy acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition (b) At least one fatty acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition, (c) At least one polyvalent metal salt in an amount ranging from 2% to 20% by mass relative to the total mass of the composition, (d) at least one polysaccharide Includes, (d) At least one polysaccharide is configured to disperse the internal aqueous droplets in a continuous aqueous phase, Regarding compositions.

[0026] The compositions, preparation methods, and cosmetic methods according to the present invention will be described in more detail below.

[0027] [Composition] The aqueous emulsion composition according to the present invention comprises a continuous aqueous phase and a plurality of internal aqueous droplets dispersed in the continuous aqueous phase. The aqueous emulsion composition according to the present invention comprises (a) at least one polyhydroxy acid, (b) at least one fatty acid, (c) at least one polyvalent metal salt, and (d) at least one polysaccharide.

[0028] The compositions according to the present invention may be used for cosmetic purposes. In one embodiment of the present invention, the compositions according to the present invention are intended for topical application to keratinous substances.

[0029] For the purposes of this invention, “keratin material” is intended to mean skin and keratin fibers. The term “skin” as used herein includes the skin of the face and / or body, as well as the scalp. The term “keratin fibers” as used herein includes eyelashes, eyebrows, and hair. In one embodiment of the present invention, the keratin material is preferably selected from skin, scalp, and hair.

[0030] In a particular embodiment, the composition according to the present invention is used as a premix composition for cosmetics. For the purposes of the present invention, the term “premix” as herein is intended to mean a mixture of components, a composition used for the preparation of a product by being mixed with other components as one of the components. Thus, it can be said that a premix composition can be used as one of the components for a product.

[0031] The cosmetic composition may be a rinse-off type or a leave-on type, and is preferably a rinse-off type. The cosmetic composition may preferably be a cleansing composition for keratin substances, such as body soap and shampoo, and especially shampoo. Therefore, in a preferred embodiment of the present invention, the composition according to the present invention is a premix composition for shampoo compositions and can be used to prepare a shampoo composition by mixing it with other components commonly used for shampoos.

[0032] The composition according to the present invention is in the form of an aqueous emulsion in which multiple internal aqueous droplets are dispersed in a continuous aqueous phase. The average diameter of the internal aqueous droplets in the emulsion is not particularly limited, but is generally in the range of 30 nm to 10 μm, preferably 40 nm to 5 μm, and more preferably 50 nm to 1 μm. The term "average particle size" used herein may represent the volume-average diameter, which is given to half of the population by statistical particle size distribution and is referred to as d50. The volume-average diameter can be measured, for example, by a dynamic light scattering particle size distribution analyzer.

[0033] The internal aqueous droplets contain (b) at least one fatty acid, which is one of the cosmetic active substances. Therefore, the present invention can provide (b) fatty acids that are well dispersed in the aqueous phase in the form of an emulsion.

[0034] Internal aqueous droplets may be present in the composition according to the present invention in an amount of 10% by mass or more, preferably 20% by mass or more, and more preferably 30% by mass or more, based on the total mass of the composition.

[0035] Internal aqueous droplets may be present in the composition according to the present invention in an amount of 70% by mass or less, preferably 60% by mass or less, and more preferably 50% by mass or less, based on the total mass of the composition.

[0036] Internal aqueous droplets may be present in the composition according to the present invention in an amount ranging from 10% to 70% by mass, preferably 20% to 60% by mass, and more preferably 30% to 50% by mass, relative to the total mass of the composition.

[0037] The continuous aqueous phase may be present in the composition according to the present invention in an amount of 20% by mass or more, preferably 30% by mass or more, and more preferably 40% by mass or more, based on the total mass of the composition.

[0038] The continuous aqueous phase may be present in the composition according to the present invention in an amount of 75% by mass or less, preferably 65% ​​by mass or less, and more preferably 55% by mass or less, based on the total mass of the composition.

[0039] The continuous aqueous phase may be present in the composition according to the present invention in an amount ranging from 20% to 75% by mass, preferably 30% to 65% by mass, and more preferably 40% to 55% by mass, relative to the total mass of the composition.

[0040] In the context of this specification, any combination of the above upper and lower limits can be used to represent a range of preferred quantities.

[0041] The ingredients are listed below in more detail.

[0042] (Polyhydroxy acids) The composition according to the present invention comprises (a) at least one polyhydroxy acid. Two or more polyhydroxy acids may be used in combination. Therefore, a single type of (a) polyhydroxy acid may be used, or a combination of different types of (a) polyhydroxy acids may be used.

[0043] For the purposes of this invention, the term "polyhydroxy acid" as used herein means an organic compound having at least one carboxyl group and a plurality of hydroxyl groups. The number of carboxyl groups in a polyhydroxy acid is not limited, but one or two carboxyl groups are preferred, and one carboxyl group is more preferred. The number of hydroxyl groups in a polyhydroxy acid is also not limited, but 2 to 10 are preferred, and 2 to 6 are more preferred. The number of carbon atoms in a polyhydroxy acid is not limited, but 3 to 11 are preferred, and 3 to 8 are more preferred.

[0044] The above organic compounds may be aliphatic or aromatic. In other words, the polyhydroxy acid may be selected from aliphatic polyhydroxy acids or from aromatic polyhydroxy acids. It is preferable that the aliphatic polyhydroxy acid be selected from sugar acids.

[0045] Examples of polyhydroxy acids include dihydroxypropanoic acid, e.g., glyceric acid; trihydroxybutanoic acid, e.g., erythronic acid and threonic acid; tetrahydroxypentanoic acid, e.g., ribonic acid, arabinonic acid, xylonic acid, and lyxonic acid; pentahydroxyhexanoic acid, e.g., aronic acid, altonic acid, gluconic acid, mannonic acid, guronic acid, idonic acid, galactonic acid, and talonic acid; hexahydroxyheptanoic acid, e.g., glucoheptanoic acid and galactoheptonic acid; tartaric acid; lactobionic acid, maltobionic acid, and mixtures thereof.

[0046] (a) The polyhydroxy acid is preferably in the form of a lactone. The lactone ring of (a) polyhydroxy acid in the form of a lactone may be saturated. Examples of (a) polyhydroxy acids include gluconolactone, ribonolactone, and mixtures thereof.

[0047] (a) The polyhydroxy acid is more preferably a gluconolactone.

[0048] (a) The polyhydroxy acid may be in the form of a salt. The type of salt is not limited. Examples of salts include alkali metal salts such as sodium salts and potassium salts; alkaline earth metal salts such as calcium salts and magnesium salts; zinc salts; iron salts; ammonium salts; amine salts such as monoethanolamine salts, diethanolamine salts and triethanolamine salts; and mixtures thereof. Sodium salts are preferred. If two or more salts are used, they may be the same or different.

[0049] (a) At least one polyhydroxy acid is present in the composition according to the present invention in an amount ranging from 15% to 40% by mass relative to the total mass of the composition.

[0050] (a) A polyhydroxy acid may be present in the composition according to the present invention in an amount of 37.5% by mass or less, preferably 35% by mass or less, and more preferably 32.5% by mass or less, based on the total mass of the composition.

[0051] (a) Polyhydroxy acids may be present in the composition according to the present invention in an amount of 15% to 37.5% by mass, preferably 15% to 35% by mass, and more preferably 15% to 32.5% by mass, based on the total mass of the composition.

[0052] (fatty acid) The composition according to the present invention comprises (b) at least one fatty acid. Two or more fatty acids may be used in combination. Therefore, a single type of (b) fatty acid may be used, or a combination of different types of (b) fatty acids may be used.

[0053] (b) Fatty acids may have the function of a cosmetic active ingredient, such as an antibacterial agent. (b) Fatty acids, together with (a) at least one polyhydroxy acid and (c) at least one polyvalent metal salt, constitute internal aqueous droplets in an aqueous-water emulsion. Therefore, the composition according to the present invention can provide (b) at least one fatty acid, which is a cosmetic active ingredient, that is well dispersed in the aqueous phase in the form of an emulsion.

[0054] (b) Fatty acids may be hydrophilic or water-soluble. For the purposes of this invention, the term "hydrophilic" is defined as being at room temperature (25°C) and atmospheric pressure (10°C). 5 In Pa, this is intended to mean a substance that is soluble in water at a concentration of at least 1% by mass relative to the total mass of water.

[0055] (b) The fatty acid is preferably selected from short-chain fatty acids containing 1 to 6 carbon atoms.

[0056] (b) The fatty acid may be saturated or unsaturated, linear or branched, preferably saturated linear or branched, and more preferably linear and saturated.

[0057] (b) Examples of fatty acids include linear C1-C6 fatty acids, particularly propionic acid, butyric acid, valeric acid and their salts, as well as mixtures thereof.

[0058] (b) Fatty acids may also be in the form of salts. The term “salt” here means a salt formed by adding a suitable base to an acid. Examples of salts include metal salts, such as salts with alkali metals such as Na and K, and salts with alkaline earth metals such as Mg and Ca, as well as ammonium salts.

[0059] (b) At least one fatty acid is present in the composition according to the present invention in an amount ranging from 15% to 40% by mass relative to the total mass of the composition.

[0060] (b) Fatty acids may be present in the composition according to the present invention in an amount of 35% by mass or less, preferably 30% by mass or less, and more preferably 27.5% by mass or less, based on the total mass of the composition.

[0061] (b) Fatty acids may be present in the composition according to the present invention in an amount of 15% to 35% by mass, preferably 15% to 30% by mass, and more preferably 15% to 27.5% by mass, relative to the total mass of the composition.

[0062] (Polyvalent metal salts) The composition according to the present invention comprises (c) at least one polyvalent metal salt. Two or more polyvalent metal salts may be used in combination. Therefore, a single type of (c) polyvalent metal salt may be used, or a combination of different types of (c) polyvalent metal salts may be used.

[0063] For the purposes of the present invention, the term "metal salt" as used herein means a cosmetically acceptable, water-soluble salt that provides cationic ions in an aqueous medium. Thus, (d) a polyvalent metal salt can function as a source of polyvalent cationic metal ions in the aqueous medium of the present invention.

[0064] The polyvalent metal salt used in the composition of the present invention is preferably selected from divalent or trivalent metal salts, and more preferably selected from divalent metal salts such as calcium salts, magnesium salts, and zinc salts. Calcium salts, such as calcium chloride, calcium pyrrolidone carboxylate (PCA), calcium acetate, calcium aspartate, and calcium lactate are preferred. Calcium chloride and calcium pyrrolidone carboxylate are particularly preferred.

[0065] (c) At least one polyvalent metal salt is present in the composition according to the present invention in an amount ranging from 2% by mass to 20% by mass with respect to the total mass of the composition.

[0066] (c) A polyvalent metal salt may be present in the composition according to the present invention in an amount of 3.5% by mass or more, preferably 5% by mass or more, based on the total mass of the composition.

[0067] (c) A polyvalent metal salt may be present in the composition according to the present invention in an amount of 17.5% by mass or less, preferably 15% by mass or less, based on the total mass of the composition.

[0068] (c) Polyvalent metal salts may be present in the composition according to the present invention in an amount of 3.5% to 17.5% by mass, preferably 5% to 15% by mass, relative to the total mass of the composition.

[0069] (polysaccharide) The compositions according to the present invention contain (d) at least one polysaccharide. Two or more polysaccharides may be used in combination. Therefore, a single type of (d) polysaccharide may be used, or a combination of different types of (d) polysaccharides may be used.

[0070] (d) The polysaccharide is configured to disperse internal aqueous droplets, i.e., (b) at least one fatty acid and (c) at least one polyvalent metal salt, in the continuous aqueous phase. Thus, it can be said that (d) the polysaccharide is used to stabilize the aqueous emulsion of the present invention. This means that (d) the polysaccharide is included with the intention of being present at the interface between the internal droplets and the continuous phase.

[0071] The (d) polysaccharide of the present invention may be water-soluble. For the purposes of the present invention, the term "water-soluble" as herein refers to water-soluble water at room temperature (25°C) and atmospheric pressure (10°C). 5 In Pa, this means that the substance is soluble in water at a concentration of at least 1% by mass, for example, at least 5% or 10% by mass, relative to the total mass of water.

[0072] (d) The molecular weight of the polysaccharide may be in the range of 1,000 to 2,000,000, preferably 2,000 to 1,000,000, more preferably 3,000 to 500,000, and even more preferably 5,000 to 300,000. Unless otherwise defined in the description, "molecular weight" means number-average molecular weight. The molecular weight can be measured or determined by gel permeation chromatography, for example, in accordance with ASTM D5296-19.

[0073] (d) The polysaccharide may be selected from cationic polysaccharides, anionic polysaccharides, nonionic polysaccharides, and combinations thereof. Preferably, the polysaccharide is selected from ionic polysaccharides, cationic and anionic polysaccharides, more preferably from anionic polysaccharides.

[0074] - Cationic polysaccharides Cationic polysaccharides have a positive charge density. The charge density of cationic polysaccharides can be 0.01 meq / g to 20 meq / g, preferably 0.05 to 15 meq / g, and more preferably 0.1 to 10 meq / g.

[0075] Cationic polysaccharides may have at least one positively charged moiety and / or a positively charged moiety selected from the group consisting of primary, secondary, or tertiary amino groups, quaternary ammonium groups, guanidine groups, biguanide groups, imidazole groups, imino groups, and pyridyl groups. Herein, the term (primary) "amino group" means an -NH2 group.

[0076] The cationic polysaccharide preferably has at least one quaternary ammonium group, preferably a quaternary trialkylammonium group, and more preferably a quaternary trimethylammonium group.

[0077] The quaternary ammonium group has the following chemical formula (I):

[0078] [ka]

[0079] [In the formula, Each of R1 and R2 is C 1~3 The alkyl group is preferably a methyl group or an ethyl group, more preferably a methyl group. R3 is C 1~24 The alkyl group is preferably a methyl group or an ethyl group, more preferably a methyl group. X- represents an anion, preferably a halide ion, more preferably a chloride ion. n represents an integer between 0 and 30, preferably between 0 and 10, more preferably 0. R4 is C 1~4 [Represents an alkylene group, preferably an ethylene group or a propylene group.] It can be found in quaternary ammonium group-containing groups, which can be represented by [this].

[0080] The leftmost ether bond (-O-) in the above chemical formula (I) can bond to the sugar ring of a polysaccharide.

[0081] The quaternary ammonium group-containing group is -O-CH2-CH(OH)-CH2-N + (CH3)3 is preferred.

[0082] Cationic polysaccharides may preferably be selected from cationic cellulose polymers.

[0083] According to the present invention, "cationic cellulose polymer" refers to any non-silicified (silicon atom-free) cellulose polymer that contains cationic groups and / or groups that can be ionized to cationic groups, preferably without containing anionic groups and / or groups that can be ionized to anionic groups.

[0084] The term "cellulose polymer," according to the present invention, refers to any polysaccharide compound having at least 20 glucose residue chains linked by β-1,4 bonds in its structure. The cellulose polymer may also be associative, that is, having at least one C8-C in its structure 30 It may have aliphatic chains.

[0085] Non-limiting examples of cationic cellulose polymers are as follows:

[0086] (1) Cationic cellulose polymers, for example, cellulose ether derivatives containing one or more quaternary ammonium groups, as described in French Patent No. 1492597, such as polymers sold by Dow Chemical under the names "JR" (JR 400, JR 125, JR 30M) or "LR" (LR 400, LR 30M). These polymers are also defined in the CTFA dictionary as quaternary ammonium of hydroxyethylcellulose reacted with an epoxide substituted with a trimethylammonium group.

[0087] (2) Cationic cellulose polymers, for example, cellulose copolymers and cellulose derivatives grafted with at least one water-soluble monomer of quaternary ammonium, as described in, for example, U.S. Patent No. 4,131,576, for example, hydroxyalkyl cellulose grafted with at least one selected from methacryloylethyltrimethylammonium, methacrylamidopropyltrimethylammonium, and dimethyldiallylammonium, such as hydroxymethyl, hydroxyethyl, and hydroxypropyl cellulose. Commercial products corresponding to these polymers include, for example, products sold by Akzo Novel under the names "Celquat® L 200" and "Celquat® H 100".

[0088] (3) A cationic cellulose polymer having at least one quaternary ammonium group comprising at least one aliphatic chain.

[0089] The aliphatic chain of the quaternary cellulose modified by a group containing at least one linear aliphatic chain may be a linear alkyl, a linear or branched arylalkyl, a linear alkylaryl, preferably a linear alkyl (these groups contain at least 8 carbon atoms, particularly 8 to 30 carbon atoms, more preferably 10 to 24 or 10 to 14 carbon atoms), or a mixture thereof.

[0090] Preferably, the quaternary hydroxyethylcellulose modified by a group containing at least one linear aliphatic chain, such as a linear alkyl, linear arylalkyl, linear alkylaryl, or preferably a linear alkyl (these groups contain at least 8 carbon atoms, particularly 8 to 30 carbon atoms, more preferably 10 to 24 or 10 to 14 carbon atoms), or a mixture thereof.

[0091] Preferably, formula (Ib):

[0092] [ka]

[0093] [wherein, - R is an ammonium group RaRbRcN + -, Q - (where Ra, Rb, Rc are the same or different and represent a hydrogen atom or a linear C1-C 30 alkyl, preferably alkyl, and Q - represents an anionic counter ion, for example a halide ion such as a chloride ion or a bromide ion), - R' is an ammonium group R'aR'bR'cN + -, Q' - (where R'a, R'b, R'c are the same or different and represent a hydrogen atom or a linear C1-C30 alkyl, preferably alkyl, and Q' - represents an anionic counter ion, for example a halide ion such as a chloride ion or a bromide ion), It is understood that at least one of the Ra, Rb, Rc, R'a, R'b, R'c groups represents a linear C8-C 30 alkyl, - n, x, and y are the same or different and represent an integer between 1 and 10000] Hydroxyethyl cellulose can be mentioned.

[0094] Preferably, in formula (Ib), at least one of the Ra, Rb, Rc, R'a, R'b, R'c groups is a linear C8-C 30 alkyl, preferably C 10 ~C 24 or C 10 ~C 14 and particularly, a dodecyl group (C 12 ) can be mentioned. Preferably, the other groups represent a linear C1-C4 alkyl, particularly methyl.

[0095] Preferably, in formula (Ib), only one of the Ra, Rb, Rc, R'a, R'b, R'c groups is a linear C8-C 30Alkyl, preferably C 10 ~C 24 or C 10 ~C 14 This represents, in particular, the dodecyl group (C 12 ) can be given as examples. Preferably, all other groups represent linear C1-C4 alkyl groups, particularly methyl groups.

[0096] More preferably, R is -N + (CH3)3, Q' - and -N + (C 12 H 25 )(CH3)2, Q' - Preferably -N + (CH3)3, Q' - It can be a base selected from other bases.

[0097] More preferably, R' is -N + (C 12 H 25 )(CH3)2, Q' - It can be the basis.

[0098] The nitrogen percentage can vary from 0.1 to 10% by mass, preferably 0.2 to 5% by mass, and more preferably 0.5 to 3% by mass, relative to the total mass of the polymer.

[0099] In particular, polymers with the following INCI names can be cited: - Polyquaternium-24, for example, product QUATRISOFT LM 200 (registered trademark) sold by AMERCHOL / DOW CHEMICAL, - PG-hydroxyethylcellulose cocodimonium chloride, for example, product CRODACEL QM (registered trademark), - PG-hydroxyethylcellulose lauryldimonium chloride (C 12 Alkyl), for example, product CRODACEL QL (registered trademark), and - PG-Hydroxyethylcellulose Stearyldimonium Chloride (C 18Alkyl compounds, for example, CRODACEL QS (registered trademark), a product marketed by CRODA.

[0100] R represents trimethylammonium halide, R' represents dimethyldodecylammonium halide, and preferably R represents trimethylammonium chloride Cl - ,(CH3)3N + - represents dimethyldodecylammonium chloride Cl - ,(CH3)2(C 12 H 25 )N + Hydroxyethylcellulose of formula (Ib), which represents -, can also be cited. This type of polymer is known by the INCI name polyquaternium-67, and commercially available products include SOFTCAT POLYMER SL® polymers from AMERCHOL / DOW CHEMICAL, such as SL-100, SL-60, SL-30, SL-5 and SX-1300X.

[0101] More specifically, the cationic cellulose polymer is selected from hydroxyethylcellulose (INCI name polyquaternium-67) obtained by reacting with trimethylammonium epoxide and lauryldimethylammonium epoxide. Preferably, it is commercially available from Amerchol under the names Softcat Polymer SL-100 or Softcat Polymer SX-1300X.

[0102] In some cases, it is preferable to select the cationic polysaccharide from cationic starch.

[0103] Examples of cationic starches include starch modified with 2,3-epoxypropyltrimethylammonium salt (e.g., chloride), such as starch hydroxypropyltrimonium chloride, known by its INCI name, and sold by Ondeo as SENSOMER Cl-50 or by Ingredion as Pencare® DP 1015.

[0104] The cationic polysaccharide may preferably be selected from cationic gums, particularly cationic galactomannan gum.

[0105] The term "cationic galactomannan gum" refers to any galactomannan gum containing a cationic group and / or an ionizable group on the cationic group.

[0106] Galactomannan is a polysaccharide essentially composed of galactose and mannose units, with the mannose units linked by 1-4 glycosidic bonds, resulting in galactose branching via 1-6 crosslinks to the mannose units. Each ring of either the galactose or mannose unit (i.e., the sugar unit) has three free hydroxyl groups available for chemical reactions. Galactomannan is commonly found in the grains of leguminous plants, such as the endmilk of guar or carob.

[0107] Preferred cationic groups are selected from those comprising primary, secondary, tertiary, and / or quaternary amine groups.

[0108] Suitable galactomannan groups for use according to the present invention are, for example, gums containing trialkyl(C1-C4)ammonium cationic groups. Preferably, 2% to 30% of the number of hydroxyl functional groups in these gums are trialkylammonium cationic groups.

[0109] Among these trialkylammonium groups, the trimethylammonium group and the triethylammonium group can be mentioned in very specific terms.

[0110] More preferably, these groups constitute 5% to 20% by mass of the total mass of the modified galactomannan gum.

[0111] According to the present invention, the cationic galactomannan gum is preferably guar gum containing a hydroxypropyltrialkylammonium group, more preferably guar gum containing a hydroxypropyltrimethylammonium group, i.e., guar gum modified with, for example, 2,3-epoxypropyltrimethylammonium chloride.

[0112] The gum may be selected from the group consisting of, for example, cassia gum, karaya gum, konjac gum, tragacanth gum, tara gum, and acacia gum.

[0113] These galactomannan gums, particularly those derived from guar modified with cationic groups, are already known products, as described, for example, in U.S. Patent Nos. 3,589,578 and 4,031,307.

[0114] Examples of cationic gums include cationic polygalactomannan derivatives, such as guar gum derivatives and cassia gum derivatives. Such products are also marketed by Rhodia under the trademark names Jaguar EXCEL, Jaguar C13 S, Jaguar C15, Jaguar C17, and Jaguar C162 (guar hydroxypropyltrimonium chloride), by Degussa under the name Amilan® Guar (guar hydroxypropyltrimonium chloride), and by Aqualon under the name N-Hance® 3000 (guar hydroxypropyltrimonium chloride). Hydroxypropyl guar hydroxypropyltrimonium chloride is a hydroxypropyl derivative of guar hydroxypropyltrimonium chloride and is marketed by Rhodia Inc. under the Jaguar® trademark series. Cassia hydroxypropyltrimonium chloride is marketed by Lubrizol Advanced Materials, Inc. under the trademarks Sensore® CT-250 and Sensore® CT-400, or by Ashland Inc. under the trademark ClearHance®.

[0115] Cationic polysaccharides are also preferably selected from polyamines, such as chitosan.

[0116] In one preferred embodiment, the cationic polysaccharide is selected from cationic gums, more preferably cationic galactomannan gums, and particularly cationic polygalactomannan derivatives, such as guar gum derivatives.

[0117] The cationic polysaccharide may be preferably selected from the group consisting of polyquaternium-4, polyquaternium-10, polyquaternium-24, polyquaternium-67, starch hydroxypropyltrimonium chloride, guar hydroxypropyltrimonium chloride, hydroxypropyl guar hydroxypropyltrimonium chloride, cassia hydroxypropyltrimonium chloride, chitosan, and mixtures thereof, more preferably guar hydroxypropyltrimonium chloride, hydroxypropyl guar hydroxypropyltrimonium chloride, and mixtures thereof.

[0118] - Anionic polysaccharides Anionic polysaccharides may be water-soluble and can retain a negative charge in water.

[0119] The anionic polysaccharide may have at least one negatively charged moiety and / or a negatively charged moiety selected from the group consisting of carboxylates, e.g., carboxyalkyl, sulfate, sulfonate, e.g., sulfoalkyl, phosphate, and phosphonate groups. The alkyl group in these moieties is C 1~4 Alkyl groups may also be present, such as methyl, ethyl, and propyl.

[0120] Anionic polysaccharides preferably have at least one carboxylate group, such as a carboxyalkyl group. The counterion of the anionic group is usually an alkali metal or alkaline earth metal, preferably sodium, potassium, magnesium, or calcium. The anionic group can also exist in an acidic form, and in an aqueous environment, the corresponding anionic group is formed.

[0121] Anionic polysaccharides may contain at least one anionic group derived from carboxylic acids, sulfonic acids, sulfenic acids, phosphoric acids, phosphonic acids, or pyruvate. Preferably, the anionic group is a carboxylic acid group. The anionic group may also be in the form of an acid salt, particularly a sodium salt, calcium salt, lithium salt, or potassium salt.

[0122] The anionic polysaccharide may be selected from natural anionic polysaccharides or from synthetic anionic polysaccharides.

[0123] Suitable examples of natural anionic polysaccharides of the present invention include polysaccharides containing at least one glucuronic acid as a component, such as xanthan gum, gelan gum, gum arabic, alginic acid or alginate, hyaluronic acid and its salts; polysaccharides containing at least one galacturonic acid as a component, such as pectin; sulfated polysaccharides, such as carrageenan, urban, fucoidan, chondroitin sulfate, dermatan sulfate; agar, and combinations thereof.

[0124] Xanthannes are heteropolysaccharides produced on an industrial scale by aerobic fermentation of the bacterium Xanthomonas campestris. Their structure, like cellulose, consists of a main chain of β-D-glucose molecules linked by β(1,4). One of the two glucose molecules has a trisaccharide side chain composed of α-D-mannose, β-D-glucuronic acid, and terminal β-D-mannose. The internal mannose residues are generally acetylated at carbon 6. Approximately 30% of the terminal mannose residues possess a pyruvate group chelated between carbon 4 and carbon 6. Glucuronic acid and charged pyruvate are ionizable and therefore contribute to the anionic properties of xanthannes (negative charge until pH 1). The content of pyruvate and acetate residues varies depending on the bacterial strain, fermentation process, post-fermentation conditions, and purification stage.

[0125] Xanthan gum is represented, for example, by products marketed as Rhodicare by Rhodia Chimie, Satiaxane (trademark) by Cargill Texturizing Solutions (for the food, cosmetic, and pharmaceutical industries), Novaxan (trademark) by ADM, and Kelzan (registered trademark) and Keltrol (registered trademark) by CP-Kelco.

[0126] Gellan gum is an anionic linear heteropolysaccharide based on oligosaccharide units composed of four sugars (tetrasaccharides). D-glucose, L-rhamnose, and D-glucuronic acid are present in gellan gum in a 2:1:1 ratio as monomer elements. Gellan gum is sold, for example, by CP Kelco under the name Kelcogel CG LA.

[0127] Gum arabic is a highly branched acidic polysaccharide that exists in the form of a mixture of potassium, magnesium, and calcium salts. The monomeric elements of the free acid (arabic acid) are D-galactose, L-arabinose, L-rhamnose, and D-glucuronic acid.

[0128] Alginic acid, a natural substance derived from brown algae or certain bacteria, is a polyuronic acid composed of two uronic acids linked by a 1,4-glycosidic bond: β-D-mannuronic acid (M) and α-L-glucuronic acid (G). Alginic acid can form water-soluble salts (alginates) with alkali metals, such as sodium, potassium, or lithium, lower amines such as methylamine, ethanolamine, diethanolamine, or triethanolamine, or ammonium substituted cations.

[0129] Hyaluronic acid can be represented by the following chemical formula:

[0130] [ka]

[0131] In the context of this invention, the term "hyaluronic acid" is, in particular, the following formula:

[0132] [ka]

[0133] It contains the basic units of hyaluronic acid.

[0134] This is the smallest fraction of hyaluronic acid, containing disaccharide dimers, namely D-glucuronic acid and N-acetylglucosamine.

[0135] The term "hyaluronic acid and its derivatives" also, in the context of the present invention, includes linear polymers comprising the above-mentioned polymer units linked to one another in the chain via alternating β(1,4) and β(1,3) glycosidic bonds, having a molecular weight (MW) that may be in the range of 380 to 1,000,000 daltons. This molecular weight depends mainly on the source and / or preparation method from which the hyaluronic acid is obtained.

[0136] The term "hyaluronic acid and its derivatives" also includes hyaluronic acid salts in the context of this invention. Examples of salts include alkali metal salts such as sodium and potassium salts, alkaline earth metal salts such as magnesium salts, ammonium salts, and mixtures thereof. In one preferred embodiment, the hyaluronic acid derivative is sodium hyaluronate.

[0137] According to a preferred embodiment of the present invention, the hyaluronic acid fraction suitable for use included in the present invention has a molecular weight between 50,000 and 5,000,000 Da, particularly between 100,000 and 5,000,000 Da, and especially between 400,000 and 5,000,000 Da. In this case, the term used is high molecular weight hyaluronic acid.

[0138] Alternatively, a hyaluronic acid fraction that may be suitable for use and included in the scope of this invention may have a molecular weight between 50,000 and 400,000 Da. In this case, the term used is medium molecular weight hyaluronic acid.

[0139] Alternatively, the hyaluronic acid fraction that may be suitable for use and included in the scope of this invention has a molecular weight of less than 50,000 Da. In this case, the term used is low molecular weight hyaluronic acid.

[0140] Pectin is a linear polymer of α-D-galacturonic acid (at least 65%) linked at positions 1 and 4, with a specific ratio of carboxylic acid groups esterified with methanol groups. Approximately 20% of the sugars constituting the pectin molecule are neutral sugars (L-rhamnose, D-glucose, D-galactose, L-arabinose, D-xylose). L-rhamnose residues are present in all pectin molecules and are incorporated into the main chain at positions 1 and 2. Uronic acid molecules possess carboxyl functional groups. These functional groups give pectin the ability to exchange ions, when they are in the form of "COO". Divalent ions (especially calcium) have the ability to form ionic crosslinks between two carboxyl groups of two different pectin molecules.

[0141] Carrageenan is an anionic polysaccharide that constitutes the cell walls of various red algae (Rhodophyceae) belonging to the families Gigartinaceae, Hypneaceae, Furcellariaceae, and Polyideaceae. Carrageenan is generally obtained by hot water extraction from natural strains of the aforementioned algae. These linear polymers, formed from disaccharide units, consist of two D-galactopyranos units linked alternately via α(1,3) and β(1,4) bonds. Carrageenan is a highly sulfated polysaccharide (20-50%), and the α-D-galactopyranosyl residue can be in the 3,6-anhydro form. Depending on the number and position of ester sulfate groups on the repeating disaccharide of the molecule, several types of carrageenan are distinguished: κ-carrageenan having one ester sulfate group, ι-carrageenan having two ester sulfate groups, and λ-carrageenan having three ester sulfate groups. Carrageenan is essentially composed of potassium, sodium, magnesium, triethanolamine, and / or calcium salts of polysaccharides, as well as sulfate esters.

[0142] Agar is formed from polymer groups whose basic structure consists of β(1,3)D-galactopyranose and α(1,4)L3-6 anhydrogalactose chains, with these units repeating regularly and alternately. Differences within the agar family are due to the presence or absence of solvated methyl or carboxyethyl groups. These hybrid structures generally exist in varying percentages depending on the algal species and harvest time.

[0143] In one preferred embodiment, the anionic polysaccharide is selected from polysaccharides containing at least one glucuronic acid as a component, such as xanthan gum, gelan gum, gum arabic, alginic acid or alginate, and hyaluronic acid, and is particularly xanthan gum.

[0144] Suitable examples of synthetic anionic polysaccharides include anionic cellulose derivatives. Anionic cellulose derivatives include carboxyalkyl groups, particularly C 1~4 Carboxyalkyl groups, such as carboxymethyl group, carboxyethyl group, carboxypropyl group, and sulfoalkyl groups, particularly C 1~4 Examples include those modified with sulfoalkyl groups, such as sulfomethyl groups. Examples of anionic cellulose derivatives include carboxymethylcellulose, carboxyethylcellulose, carboxypropylcellulose, sulfoethylcarboxymethylcellulose, carboxymethylhydroxyethylcellulose ("CM-HEC"), and carboxymethylcellulose.

[0145] The anionic polysaccharide is preferably a polysaccharide containing at least one glucuronic acid as a component, such as xanthan gum, gelan gum, gum arabic, alginic acid or alginate, hyaluronic acid and its salts, more preferably xanthan gum, and hyaluronic acid and its salts, and combinations thereof.

[0146] - Nonionic polysaccharides Nonionic polysaccharides may be selected from, for example, those listed in "Encyclopedia of Chemical Technology," Kirk-Othmer, 3rd edition, 1982, Vol. 3, pp. 896-900 and Vol. 15, pp. 439-458; "Polymers in Nature" by E.A. MacGregor and CT. Greenwood, published by John Wiley & Sons, Chapter 6, pp. 240-328, 1980; and "Industrial Gums-Polysaccharides and their Derivatives," edited by Roy L. Whistler, 2nd edition, published by Academic Press Inc., the contents of these three publications are incorporated as a whole by reference.

[0147] More specifically, nonionic polysaccharides may be selected from, for example, glucans, modified and unmodified starches (e.g., derived from cereals such as wheat, maize, or rice; vegetables such as yellow peas; and tubers such as potatoes or cassava), amylose, amylopectin, glycogen, dextran, cellulose and its derivatives (methylcellulose, hydroxyalkylcellulose, ethylhydroxyethylcellulose, and carboxymethylcellulose), mannan, xylan, lignin, araban, galactan, galacturonan, chitin, glucuronoxylan, arabinoxylan, xyloglucan, glucomannan, arabinogalactan, tragacanth gum, gatti gum, karaya gum, locust bean gum, or carob gum, galactomannan, such as guar gum and its nonionic derivatives (e.g., hydroxypropyl guar), and mixtures thereof, which are different from the cationic and anionic polysaccharides described above.

[0148] Among the starches that can be used, examples include polymers in the form of polymers containing a basic part that is anhydrous glucose units. The number and arrangement of these parts distinguish between amylose (linear polymers) and amylopectin (branched polymers). The relative ratio of amylose to amylopectin, and their degrees of polymerization, can vary depending on the plant origin of the starch.

[0149] The plant origin of the starch molecules used may be cereals or tubers. Therefore, the starch may be selected from, for example, corn starch, rice starch, cassava starch, tapioca starch, barley starch, potato starch, wheat starch, sorghum starch, and pea starch.

[0150] Starch is generally in the form of a white powder that is insoluble in cold water and has a basic particle size in the range of 3 to 100 microns.

[0151] The starch may optionally be C1-C6 hydroxyalkylated or C1-C6 acylated (e.g., acetylated). The starch may also be heat-treated.

[0152] Guar gum may be denatured or undenatured.

[0153] Modified nonionic guar gum is modified, for example, with C1-C6 hydroxyalkyl groups.

[0154] Examples of hydroxyalkyl groups include hydroxymethyl, hydroxyethyl, hydroxypropyl, and hydroxybutyl groups.

[0155] These guar gums are well known in the prior art, and for example, they can be prepared by reacting the corresponding alkene oxide with the guar gum, for example, propylene oxide to obtain guar gum modified with a hydroxypropyl group.

[0156] The degree of hydroxyalkylation corresponds to the number of alkylene oxide molecules consumed by the number of free hydroxyl functional groups present in the guar gum, and may be in the range of, for example, 0.4 to 1.2.

[0157] Such nonionic guar gums, optionally modified with hydroxyalkyl groups, are marketed, for example, by Solvay under the trade names Jaguar HP-8 COS, Jaguar HP-60, and Jaguar HP-120.

[0158] Examples of cellulose used include hydroxyethylcellulose and hydroxypropylcellulose. These are products marketed by Ashland under the names Klucel EF, Klucel H, Klucel MF, and Klucel G.

[0159] Alternatively, polysaccharides derived from microorganisms can also be preferably used as hydrophilic nonionic polysaccharide thickeners.

[0160] Microbial polysaccharides refer to polysaccharides produced by microorganisms such as germs or bacteria.

[0161] Polysaccharides derived from microorganisms are not the same as those derived from plants. Therefore, it may be preferable for polysaccharides derived from microorganisms not to be cellulose-based.

[0162] Examples of polysaccharides derived from microorganisms include cardran, gellan gum, dextran, pullulan, sclerotium gum, and mixtures thereof.

[0163] In one preferred embodiment of the present invention, (d) the polysaccharide is selected from ionic polysaccharides, i.e., cationic polysaccharides and anionic polysaccharides, preferably anionic polysaccharides, more preferably anionic polysaccharides comprising at least one glucuronic acid as a component, such as xanthan gum, gellan gum, gum arabic, alginic acid, alginate, hyaluronic acid and its salts, and combinations thereof, even more preferably xanthan gum, and hyaluronic acid and its salts, and combinations thereof.

[0164] (d) Polysaccharides may be present in the composition according to the present invention in an amount of 0.05% by mass or more, preferably 0.1% by mass or more, and more preferably 0.2% by mass or more, based on the total mass of the composition.

[0165] (d) Polysaccharides may be present in the composition according to the present invention in an amount of 3% by mass or less, preferably 2% by mass or less, and more preferably 1.5% by mass or less, based on the total mass of the composition.

[0166] (d) Polysaccharides may be present in the composition according to the present invention in an amount of 0.05% to 3% by mass, preferably 0.1% to 2% by mass, and more preferably 0.2% to 1.5% by mass, relative to the total mass of the composition.

[0167] (aqueous medium) The internal aqueous droplets and continuous aqueous phase of the aqueous emulsion composition of the present invention may contain at least one aqueous medium.

[0168] For the purposes of this invention, the term "aqueous medium" as used herein means water and hydrophilic organic solvents that are miscible with water. In particular, the aqueous medium in this invention includes water.

[0169] Water may be present in the composition according to the present invention in an amount of 10% by mass or more, preferably 25% by mass or more, and more preferably 40% by mass or more, based on the total mass of the composition.

[0170] Water may be present in the composition according to the present invention in an amount of 80% by mass or less, preferably 70% by mass or less, and more preferably 60% by mass or less, based on the total mass of the composition.

[0171] Water may be present in the composition according to the present invention in an amount ranging from 10% to 80% by mass, preferably 25% to 70% by mass, and more preferably 40% to 60% by mass, relative to the total mass of the composition.

[0172] (pH adjuster) The composition of the present invention may further contain at least one pH adjusting agent. A single type of pH adjusting agent may be used, or a combination of different types of pH adjusting agents may be used.

[0173] As pH adjusters, at least one acidifying agent and / or at least one basicizing agent (alkaline agent) may be used.

[0174] The acidifying agent may be, for example, a mineral acid or organic acid, such as hydrochloric acid, phosphoric acid, a carboxylic acid, such as tartaric acid, citric acid, and lactic acid, or a sulfonic acid.

[0175] Basicizing agents, i.e., alkaline agents, include, for example, any inorganic or organic basic agent commonly used in cosmetics, such as ammonia; alkanolamines, such as mono-, di- and tri-ethanolamines, isopropanolamines; sodium hydroxide and potassium hydroxide; urea, guanidine and their derivatives; basic amino acids, such as lysine or arginine; and diamines, such as 1,3-propanediamine, which can be exemplified by the following structures:

[0176] [ka]

[0177] [In the formula, R represents an alkylene, such as propylene, which is optionally substituted with a hydroxyl or a C1-C4 alkyl group, and R1, R2, R3, and R4 independently represent a hydrogen atom, an alkyl group, or a C1-C4 hydroxyalkyl group. These may be those described in and their derivatives. Arginine, urea, and monoethanolamine may be preferred.

[0178] An acidifying agent or a basicizing agent may be present in an amount of 0.1% to 3% by mass, preferably 0.2% to 1% by mass, relative to the total mass of the composition.

[0179] The pH of the composition can be adjusted, for example, to 3.0 to 7.5, preferably 3.5 to 7.0, and more preferably 4.0 to 6.5.

[0180] (Adjuvant) The compositions according to the present invention may further comprise one or more adjuvants commonly used in the fields of cosmetics and dermatology, selected from a physiologically acceptable medium, particularly a water-soluble organic solvent; cationic, anionic, nonionic, amphoteric or zwitterionic polymers, or mixtures thereof; cationic, anionic, nonionic, amphoteric or zwitterionic surfactants, or mixtures thereof; gelling agents; thickeners; penetrating agents; anti-dandruff agents; antioxidants; humectants; emollients; free radical scavengers; suspending agents; metal ion chelating agents; buffering agents; fragrances; dispersants; dyes and / or pigments; film-forming agents; stabilizers; preservatives; co-preservatives; opacifiers; essential oils; agents capable of providing a cooling sensation; and mixtures thereof.

[0181] Needless to say, those skilled in the art will carefully select any adjuvants to be added to the compositions according to the present invention such that the advantageous properties inherently related to the compositions according to the present invention are not adversely affected or substantially affected by the proposed additions.

[0182] The adjuvant may be present in the composition of the present invention in an amount of 0.01% to 20% by mass, preferably 0.1% to 10% by mass, and more preferably 0.2% to 5% by mass, based on the total mass of the composition.

[0183] The compositions according to the present invention may be characterized by not containing or containing small amounts of surfactants commonly used in cosmetics. In one embodiment of the present invention, the composition contains an anionic, cationic, nonionic, or amphoteric surfactant in an amount of less than 10% by mass, preferably less than 5% by mass, more preferably less than 3% by mass, and even more preferably less than 1% by mass, based on the total mass of the composition. In another embodiment, the composition contains no anionic, cationic, nonionic, or amphoteric surfactants at all.

[0184] Since the composition according to the present invention is an aqueous composition, the composition contains no oils commonly used in cosmetics, or contains small amounts of such oils. In one embodiment, the composition contains oil in an amount of less than 1% by mass, preferably less than 0.5% by mass, and more preferably less than 0.1% by mass, based on the total mass of the composition. In another embodiment, the composition contains no oils at all.

[0185] According to a preferred embodiment, the aqueous emulsion composition comprises a plurality of internal aqueous droplets dispersed in a continuous aqueous phase, and with respect to the total mass of the composition, (a) 15% to 40% by mass of at least one polyhydroxy acid, (b) 15% to 40% by mass of at least one fatty acid, (c) at least one polyvalent metal salt in an amount of 2% to 20% by mass, and (d) 0.05% to 5% by mass of at least one polysaccharide Includes.

[0186] According to a preferred embodiment, the aqueous emulsion composition comprises a plurality of internal aqueous droplets dispersed in a continuous aqueous phase, and with respect to the total mass of the composition, (a) 15% to 35% by mass of at least one polyhydroxy acid selected from lactones, (b) 15% to 35% by mass of at least one fatty acid selected from short-chain fatty acids and salts thereof containing 1 to 6 carbon atoms, (c) 3.5% by mass to 17.5% by mass of at least one polyvalent metal salt selected from divalent metal salts, (d) 0.1% to 2% by mass of at least one polysaccharide selected from anionic polysaccharides. Includes.

[0187] According to a preferred embodiment, the aqueous emulsion composition comprises a plurality of internal aqueous droplets dispersed in a continuous aqueous phase, and with respect to the total mass of the composition, (a) 15% to 30% by mass of at least one polyhydroxy acid selected from gluconolactone, ribonolactone, and mixtures thereof, (b) 15% to 30% by mass of at least one fatty acid selected from propionic acid, butyric acid, valeric acid and salts thereof, and mixtures thereof, (c) 5% to 15% by mass of calcium salts, for example, at least one polyvalent metal salt selected from calcium chloride, calcium pyrrolidone carboxylate (PCA), calcium acetate, calcium aspartate, calcium lactate, and mixtures thereof, and (d) 0.2% to 1.5% by mass of anionic polysaccharides containing at least one glucuronic acid as a component, such as xanthan gum, gelan gum, gum arabic, alginic acid, alginate, hyaluronic acid and its salts, and at least one polysaccharide selected from combinations thereof. Includes.

[0188] [Preparation method] The aqueous emulsion composition according to the present invention can be prepared by mixing its components using any type of preparation method well known to those skilled in the art. Preferably, the aqueous emulsion composition according to the present invention can be obtained by a preparation method for preparing emulsions.

[0189] Therefore, the present invention also relates to a method for preparing an aqueous emulsion composition comprising a plurality of internal aqueous droplets dispersed in a continuous aqueous phase, wherein the aqueous emulsion composition is (a) At least one polyhydroxy acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition (b) At least one fatty acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition, (c) At least one polyvalent metal salt in an amount ranging from 2% to 20% by mass relative to the total mass of the composition, (d) at least one polysaccharide Includes, (d) The polysaccharide is configured to disperse the internal aqueous droplets in a continuous aqueous phase. It also concerns the method.

[0190] In one embodiment, a method for preparing an emulsion composition according to the present invention is: (i) A step of preparing a two-phase aqueous composition by mixing (a) at least one polyhydroxy acid, (b) at least one fatty acid, and (c) at least one polyvalent metal salt. (ii)(d) A step of adding at least one polysaccharide to a two-phase aqueous composition, (iii) A step of emulsifying a two-phase aqueous composition to obtain an aqueous emulsion composition containing a plurality of internal aqueous droplets dispersed in a continuous aqueous phase. It may include.

[0191] Components (a) to (d), the internal aqueous phase, and the continuous aqueous phase are the same as those described above.

[0192] The continuous phase may further include the aqueous medium described above, such as water, a pH adjuster, and / or an adjuvant.

[0193] The mixing in step (i) may be carried out by any means, for example, by stirring. The method of stirring is not particularly limited as long as a homogeneous mixture is obtained. For example, a magnetic stirrer and / or homogenizer can be used.

[0194] The aqueous composition obtained in step (i) is a two-phase aqueous composition. Here, a two-phase composition may mean a two-phase composition in which there is one interface between the two phases, and in a static state, the two phases are visually separated by this interface.

[0195] The emulsification in step (iii) may be carried out by any means, for example, by stirring. The method of stirring is not particularly limited as long as it can provide a strong shear force. For example, a magnetic stirrer and / or homogenizer can be used.

[0196] The present invention also relates to a method for preparing a cosmetic composition, comprising the step of mixing the aqueous-in-water emulsion composition according to the present invention with other components contained in the cosmetic composition.

[0197] Mixing can be carried out by any means, for example, by stirring. The method of stirring is not particularly limited, as long as a homogeneous mixture is obtained. For example, a magnetic stirrer and / or homogenizer can be used.

[0198] In this method, the composition according to the present invention is used as a premixed composition as one of the ingredients for cosmetics.

[0199] The cosmetic product may be a rinse-off type or a leave-on type, and is preferably a rinse-off type. The cosmetic product may preferably be a cleansing composition for keratin substances, such as a body soap and a shampoo, and especially a shampoo.

[0200] Other ingredients for cosmetics may be any type of ingredient commonly used in cosmetics. For example, other ingredients include physiologically acceptable media; cationic, anionic, nonionic, amphoteric or zwitterionic polymers, or mixtures thereof; cationic, anionic, nonionic, amphoteric or zwitterionic surfactants, or mixtures thereof; oils; pH adjusters, e.g., acidifiers and basicizers; cosmetic active ingredients; gelling agents; thickeners; penetrating agents; anti-dandruff agents; antioxidants; humectants; emollients; free radical scavengers; suspending agents; metal ion chelating agents; buffering agents; fragrances; dispersants; dyes and / or pigments; film-forming agents; stabilizers; preservatives; co-preservatives; opacifiers; essential oils; cooling agents; and mixtures thereof.

[0201] For example, if the cosmetic is a shampoo composition, other components may include anionic surfactants such as sodium laureth sulfate, amphoteric surfactants such as cocamidopropyl betaine, hydrophilic thickeners such as hydroxypropyl guar hydroxypropyltrimonium chloride, and pH adjusters. [Examples]

[0202] The present invention will be described in more detail by reference to examples, but this should not be construed as limiting the scope of the invention.

[0203] [Composition] Each of the aqueous emulsion compositions prepared in Examples 1-13 and Comparative Examples 1-9 was prepared using the components listed in Tables 1-4 below. First, a two-phase aqueous composition was prepared by mixing propionic acid or sodium propionate, gluconolactone, calcium chloride, and water. At room temperature (25°C) and atmospheric pressure (10°C) 5 After mixing at Pa), liquid-liquid phase separation was immediately induced. Sodium hyaluronate or xanthan gum was added to the resulting two-phase aqueous composition, and the two-phase aqueous composition was mixed to obtain an aqueous-in-water emulsion. All numerical values ​​for the amounts of components shown in Tables 1 to 4 are based on the "mass %" of the raw materials relative to the total mass of the composition.

[0204] [evaluation] (Emulsion formation) The formation of an aqueous emulsion in water was confirmed by visually observing the obtained aqueous composition using a microscope. OK: A water-based emulsion has been formed. NG: Water-based emulsion was not formed in water.

[0205] [Table 1]

[0206] [Table 2]

[0207] [Table 3]

[0208] [Table 4]

[0209] As can be seen from the results shown in the table above, the compositions of Examples 1 to 10, which contain a combination of (a) at least one polyhydroxy acid, (b) at least one fatty acid, (c) at least one polyvalent metal salt, and (d) at least one polysaccharide in a certain range of amounts, were able to form stable dispersions in the form of aqueous emulsions. The internal aqueous droplets contained a combination of (a) a polyhydroxy acid, (b) a fatty acid, and (c) a polyvalent metal salt. Therefore, the present invention was able to provide (b) fatty acids well dispersed in the aqueous phase in the form of an emulsion as a cosmetic active substance.

[0210] In contrast, the compositions of Comparative Examples 1 to 8, which contained components (a) to (c) outside the range of the present invention, and the compositions of Comparative Examples 9 and 10, which did not contain (d) polysaccharide, did not form emulsions.

[0211] [Cosmetics] A shampoo product was prepared using the composition according to Example 1 described above, and the other ingredients listed in Table 5 below. Therefore, the composition according to the present invention was used as a premix composition for shampoo cosmetics. All numerical values ​​for the amounts of ingredients shown in Table 5 are based on the "mass %" of the raw materials relative to the total mass of the composition.

[0212] [Table 5]

[0213] Therefore, it can be concluded that the compositions according to the present invention are highly suitable for a variety of cosmetic uses.

Claims

1. A water-based emulsion composition comprising a plurality of internal aqueous droplets dispersed in a continuous aqueous phase, (a) At least one polyhydroxy acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition (b) At least one fatty acid in an amount ranging from 15% to 40% by mass relative to the total mass of the composition, (c) At least one polyvalent metal salt in an amount ranging from 2% by mass to 20% by mass relative to the total mass of the composition, (d) at least one polysaccharide Includes, (d) At least one polysaccharide is configured to disperse the internal aqueous droplets in a continuous aqueous phase, composition.

2. (a) The composition according to claim 1, wherein at least one polyhydroxy acid is selected from lactones.

3. (a) The composition according to claim 1 or 2, wherein at least one polyhydroxy acid is selected from gluconolactone, ribonolactone, and mixtures thereof.

4. (b) The composition according to any one of claims 1 to 3, wherein at least one fatty acid is selected from short-chain fatty acids and salts thereof that contain 1 to 6 carbon atoms.

5. (b) The composition according to any one of claims 1 to 4, wherein at least one fatty acid is selected from propionic acid, butyric acid, valeric acid and salts thereof, and mixtures thereof.

6. (c) The composition according to any one of claims 1 to 5, wherein at least one polyvalent metal salt is selected from divalent metal salts.

7. (c) The composition according to any one of claims 1 to 6, wherein at least one polyvalent metal salt is selected from calcium salts, such as calcium chloride, calcium pyrrolidone carboxylate (PCA), calcium acetate, calcium aspartate, calcium lactate, and mixtures thereof.

8. (d) The composition according to any one of claims 1 to 7, wherein at least one polysaccharide is selected from anionic polysaccharides.

9. (d) The composition according to any one of claims 1 to 8, wherein at least one polysaccharide is selected from xanthan gum, gellan gum, gum arabic, alginic acid, alginate, hyaluronic acid and its salts, and combinations thereof.

10. (d) The composition according to any one of claims 1 to 9, wherein at least one polysaccharide is present in an amount of 0.05% to 3% by mass, preferably 0.1% to 2% by mass, and more preferably 0.2% to 1.5% by mass, based on the total mass of the composition.

11. The composition according to any one of claims 1 to 10, wherein the internal aqueous droplets comprise (a) at least one polyhydroxy acid, (b) at least one fatty acid, and (c) a polyvalent metal salt.

12. The composition according to any one of claims 1 to 11, wherein internal aqueous droplets are present in the composition in an amount ranging from 10% to 90% by mass, preferably 20% to 80% by mass, and more preferably 30% to 70% by mass, based on the total mass of the composition.

13. A premixed composition for cosmetic use, according to any one of claims 1 to 12.

14. A method for preparing an aqueous emulsion composition according to any one of claims 1 to 13, (i) A step of preparing a two-phase aqueous composition by mixing (a) at least one polyhydroxy acid, (b) at least one fatty acid, and (c) at least one polyvalent metal salt. (ii)(d) A step of adding at least one polysaccharide to a two-phase aqueous composition, (iii) A step of emulsifying a two-phase aqueous composition to obtain an aqueous emulsion composition containing a plurality of internal aqueous droplets dispersed in a continuous aqueous phase. Methods that include...

15. A method for preparing a cosmetic composition, comprising the step of mixing an aqueous-in-water emulsion composition according to any one of claims 1 to 13 with other components contained in the cosmetic composition.

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