Composition for cleaning keratin materials

Abstract

The present invention relates to a composition for cleaning keratin materials having a pH of 3.5 to 5.0, comprising, in the aqueous phase: a) at least one linear alpha-olefin sulfonate as anionic surfactant; and b) at least one organic acid as a cosmetic active ingredient. The invention also relates to a method for cleansing a keratin material, in particular skin, comprising applying said composition to a keratin material, and rinsing said composition after an optional period of time.

Description

This application is a divisional application of the invention patent application with application number 201880100496.6 and filing date of December 25, 2018, entitled “Composition for Cleaning Keratin Materials”. Field of the Invention

[0001] The present invention relates to a cosmetic composition for keratin materials. The present invention also relates to a method for cleansing keratin materials using said composition. Background Art Cleansing the skin is very important for caring for the face. It must be as effective as possible because greasy residues (e.g. excess sebum), residues from daily use of cosmetics and make-up products (especially waterproof products) accumulate in the skin folds and can clog the skin pores, causing spots to appear.

[0003] Several types of skin cleansing products are known, for example, rinseable cleansing anhydrous oils and gels, as well as foaming creams, lotions and gels.

[0004] Rinseable anhydrous oils and gels have a cleansing effect by virtue of the oils present in these formulations. These oils make it possible to dissolve fatty residues and to disperse the make-up pigments. These products are effective and well tolerated. However, they exhibit the disadvantages of being heavy, not foaming and not imparting a fresh feeling after application, which is disadvantageous from a cosmetic point of view. In addition, products of this type require dry hands when applying to the skin. This method is therefore inconvenient.

[0005] On the other hand, foaming creams, lotions and gels have a cleansing effect with the help of surfactants, which suspend fatty residues on the face. They are effective and pleasant to use because they foam and because they are easy to remove. However, this type of product is not effective in terms of removing make-up (i.e. dissolving the make-up pigments of make-up products).

[0006] Recently, cleansing products, especially facial cleansing compositions, are expected to have not only good foaming ability but also additional cosmetic effects, such as removing excess dead skin cell layers from the skin surface (ie, exfoliation) to provide radiant skin with a youthful appearance.

[0007] Most foaming facial cleansing products well known in the prior art and actually present on the market are based on formulations that usually contain fatty acid salts (soaps), preferably anionic surfactants of the sulfate type (i.e. alkyl sulfates and alkyl ether sulfates). However, these formulations have the disadvantage that, in order to provide a high level of foaming performance, they require the use of large amounts of surfactants (>20%), thus having a high pH (about 9). Those large amounts of soap and sulfate surfactants may cause skin irritation and discomfort (tightness, dryness) on the skin after use, especially when used for a long time.

[0008] Some organic acids are known to be useful for removing excess layers of dead skin cells from the skin surface. However, the addition of such organic acids lowers the pH of the cleansing product, thereby adversely affecting the foaming and rinsing abilities.

[0009] Therefore, there is a need to formulate compositions for cleansing keratin materials having good cleansing properties as well as certain cosmetic benefits brought about by organic acids.

[0010] There remains a need for new compositions having the above mentioned properties and good foaming properties. Summary of the invention The inventors have discovered that this need can be met by the present invention.

[0012] Thus, according to one aspect, the invention relates to a composition for cleaning keratin materials at a pH ranging from 3.5 to 5.0, comprising in an aqueous phase: a) at least one linear α-olefin sulfonate as an anionic surfactant; and b) at least one organic acid as cosmetic active ingredient.

[0013] According to another aspect, the present invention provides a method for cleansing keratin materials, in particular the skin, comprising applying to a keratin material, in particular the skin, a composition according to the invention and rinsing said composition after an optional period of time.

[0014] The composition according to the present invention is capable of delivering gentle massage and cleansing to the skin without any roughness.

[0015] The compositions according to the present invention also deliver good foaming and rinsing capabilities during application.

[0016] Furthermore, the composition according to the invention also delivers certain cosmetic effects brought about by organic acids, such as peeling effect / improvement of skin texture.

[0017] It can be used as a daily facial cleanser. The composition of the present invention is a rinse-off product. Thus, the composition is applied to the skin (ie, face and / or body) and then rinsed with rinse water.

[0018] Other objects and characteristics, aspects and advantages of the invention will appear even more clearly on reading the following description and examples. DETAILED DESCRIPTION In the following text and unless otherwise indicated, the upper and lower limits of a range of values ​​are included in the range, especially in the expressions "between" and "ranging from".

[0020] For the purposes of the present invention, the term "keratin material" is intended to cover human skin, mucous membranes, such as lips. Human skin, in particular facial skin, is most particularly contemplated according to the present invention.

[0021] In addition, the expression "at least one" used in the present specification is equivalent to the expression "one or more".

[0022] Throughout this application, the term "comprising" should be understood to encompass all the specifically mentioned features as well as optional, additional, not specifically stated features.

[0023] As used herein, use of the term "comprising" also discloses embodiments in which features other than those specifically mentioned are absent (ie, "consisting of.").

[0024] According to one aspect, the invention relates to a composition for cleaning keratin materials, having a pH ranging from 3.5 to 5.0, comprising in an aqueous phase: a) at least one linear α-olefin sulfonate as an anionic surfactant; and b) at least one organic acid as cosmetic active ingredient.

[0025] Linear α-olefin sulfonate The composition according to the invention comprises at least one linear α-olefin sulfonate as anionic surfactant.

[0026] The α-olefin sulfonates are known compounds and are described, inter alia, in Ullmann's Encyclopedia of Industrial Chemistry or in patent US Pat. No. 8,211,850. These compounds are generally obtained by sulfonation of long-chain α-olefins.

[0027] Preferably, the linear α-olefin sulfonates are selected from those of formula (I): R-CH2-CH=CH-(CH2) n -SO3M(I) in: - R is a saturated straight-chain alkyl group containing 4 to 30 carbon atoms, in particular 6 to 20 carbon atoms, or even 8 to 18 carbon atoms and better still 10 to 14 carbon atoms; - n is an integer between 0 and 10, preferably between 1 and 4, and even better still n=1; - M is a cosmetically acceptable cation, in particular chosen from ammonium cations, cations derived from alkali metals or alkaline earth metals, cations derived from organic amines (e.g. alkanolamines); preferably those derived from alkali metals; and in particular Na +or K + .

[0028] Preferably, R represents a straight-chain alkyl group containing 8 to 14 carbon atoms, especially 10 to 12 carbon atoms.

[0029] Preferably, M is derived from an alkali metal, especially Na + or K + .

[0030] Preferably, the linear alkane sulfonate according to the present invention has the structure of formula (II): in: - R is a saturated straight-chain alkyl group containing 4 to 20 carbon atoms, in particular 6 to 18 carbon atoms, or even 8 to 14 carbon atoms and better still 10 to 12 carbon atoms; - M is a cosmetically acceptable cation, in particular chosen from ammonium cations, cations derived from alkali metals or alkaline earth metals, cations derived from organic amines (e.g. alkanolamines); preferably those derived from alkali metals or alkaline earth metals; and in particular Na + or K + .

[0031] Preferably, the linear α-olefin sulfonate according to the invention is chosen from linear α-olefin sulfonates containing 8 to 28 carbon atoms, especially 10 to 24 carbon atoms, better still 12 to 20 carbon atoms, in particular 14 to 18 carbon atoms; in particular alkali metal salts, especially sodium salts, such as sodium C14-C16 olefin sulfonate.

[0032] Preferably, the linear alpha-olefin sulfonate is present in an amount ranging from 1 wt.% to 20 wt.%, preferably from 4 wt.% to 18 wt.%, and more preferably from 5 wt.% to 15 wt.%, relative to the total weight of the composition.

[0033] Organic Acid The compositions according to the invention comprise at least one organic acid as cosmetically active ingredient.

[0034] Many organic acids can be used as cosmetic active ingredients to bring about specific benefits, such as anti-acne effects and / or peeling effects.

[0035] Peeling is a well-known method for improving the appearance and / or texture of the skin and / or scalp, in particular for improving the radiance and evenness of skin tone and / or reducing visible and / or tactile irregularities of the skin, and is particularly useful for improving the surface appearance of the skin, for reducing solar lentigo, acne marks and chickenpox marks, and for preventing, reducing or combating the signs of skin aging, and in particular for smoothing irregularities in skin texture, such as wrinkles and fine lines.

[0036] Desquamation has the effect of removing the superficial parts of the skin (the superficial layers of the epidermis and possibly the dermis).

[0037] Organic acids useful as anti-acne and / or peeling agents are preferably selected from saturated and unsaturated monocarboxylic acids, saturated and unsaturated dicarboxylic acids, saturated and unsaturated tricarboxylic acids; α-hydroxy acids and β-hydroxy acids of monocarboxylic acids; α-hydroxy acids and β-hydroxy acids of dicarboxylic acids; α-hydroxy acids and β-hydroxy acids of tricarboxylic acids; keto acids, α-keto acids, β-keto acids of polycarboxylic acids, polyhydroxymonocarboxylic acids, polyhydroxydicarboxylic acids or polyhydroxytricarboxylic acids; and (3-hydroxy-2-pentylcyclopentyl)acetic acid.

[0038] Exemplary preferred alpha-hydroxy acids include glycolic acid, citric acid, lactic acid, tartaric acid, malic acid or mandelic acid.

[0039] Preferred beta-hydroxy acids are selected from salicylic acid and its derivatives, especially 5-n-octanoylsalicylic acid.

[0040] A person skilled in the art will be able to define the necessary amount of organic acid present in the composition according to the invention in order to obtain the desired effect on the skin.

[0041] Preferably, the organic acid is present in an amount ranging from 1 wt.% to 30 wt.%, preferably from 2 wt.% to 20 wt.%, more preferably from 3 wt.% to 15 wt.%, relative to the total weight of the composition.

[0042] More preferably, the α-hydroxy acid is present in an amount ranging from 1 wt.% to 10 wt.%, preferably from 1 wt.% to 6 wt.%, relative to the total weight of the composition.

[0043] More preferably, the beta-hydroxy acid is present in an amount ranging from 0.1 wt.% to 2 wt.%, preferably from 0.2 wt.% to 1.0 wt.%, relative to the total weight of the composition.

[0044] Amphoteric surfactant According to a preferred embodiment, the composition according to the invention comprises at least one amphoteric surfactant.

[0045] The inventors have found that the composition according to the present invention has a micellar texture and is stable over time due to the coexistence of the linear α-olefin sulfonate as an anionic surfactant and the amphoteric surfactant.

[0046] "Stable over time" is understood to mean that the composition of the invention does not exhibit any macroscopic changes in colour, odour or viscosity, any changes in pH or any changes in microscopic appearance after storage for 2 months at any temperature between 4°C and 45°C.

[0047] The amphoteric surfactants that can be used in the composition according to the invention may be optionally quaternized secondary or tertiary fatty amine derivatives containing at least one anionic group, such as a carboxylic acid group, a sulfonic acid group, a sulfate group, a phosphoric acid group or a phosphonic acid group, and in which the aliphatic group or at least one aliphatic group is a straight chain or branched chain containing from 8 to 22 carbon atoms.

[0048] In (C8-C 20 ) Among the alkyl betaines, behenyl betaine, cetyl betaine, coco betaine, decyl betaine may be mentioned. Among the alkyl betaines, coco betaine is preferred, for example, it is marketed under the trade name 1,1-dimethoxy- ... Products sold by BB / FLA.

[0049] Among the optionally quaternized secondary or tertiary fatty amine derivatives which can be used, mention may also be made of the following products of the structures (III) and (IV): R a -CON(Z)CH2-(CH2) m -N + (R b )(R c )(CH2COO - )(III) in: R a represents an acid R derived from preferably present in hydrolyzed coconut oil a -COOH C 10 -C 30 alkyl or alkenyl; heptyl; nonyl; or undecyl, R b stands for β-hydroxyethyl, R c represents carboxymethyl; m is equal to 0, 1 or 2, Z represents a hydrogen atom or a hydroxyethyl group or a carboxymethyl group; R a’ -CON(Z)CH2-(CH2) m’ -N(B)(B')(IV) in: B represents -CH2CH2OX', wherein X' represents -CH2-COOH, CH2-COOZ', -CH2CH2-COOH, -CH2CH2-COOZ' or a hydrogen atom, B' represents -(CH2) z -Y', wherein z = 1 or 2, and Y' represents -COOH, -COOZ', -CH2-CHOH-SO3H or -CH2-CHOH-SO3Z', m' is equal to 0, 1 or 2, Z represents a hydrogen atom or a hydroxyethyl or carboxymethyl group, Z' represents an ion derived from an alkali metal or alkaline earth metal, such as sodium, potassium or magnesium; an ammonium ion; or an ion derived from an organic amine and in particular from an amino alcohol, such as mono-, di- and triethanolamine, mono-, di- or triisopropanolamine, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol and tris(hydroxymethyl)aminomethane, R a' represents the acid R preferably present in hydrolyzed linseed oil or coconut oil a' C of COOH 10 -C 30 Alkyl or alkenyl; alkyl, especially C 17 Alkyl, and its isomeric forms; or unsaturated C 17 Group.

[0050] Preference is given to compounds corresponding to formula (III).

[0051] Also useful are compounds of formula (V): R a” -NH-CH(Y”)-(CH2)nC(O)-NH-(CH2)n'-N(R d )(R e )(V) in -R a” represents the acid R preferably present in hydrolyzed linseed oil or coconut oil a” -C(O)OH 10 -C 30 Alkyl or alkenyl; -Y" represents a group -C(O)OH, -C(O)OZ", -CH2-CH(OH)-SO3H or a group -CH2-CH(OH)-SO3-Z", wherein Z" represents a cationic counterion derived from an alkali metal or alkaline earth metal (e.g. sodium), an ammonium ion or an ion derived from an organic amine; -R d and R e independently represent a C1-C4 alkyl group or a hydroxyalkyl group; and -n and n' independently represent an integer in the range of 1 to 3.

[0052] Particular mention may be made of betaine-based amphoteric surfactants, such as (C8-C 20 ) alkyl betaine, sulfo betaine, (C8-C 20 (C2-C8 alkyl) betaine and (C8-C 20(C2-C8 alkyl) sulfobetaine.

[0053] Preferably, the amphoteric surfactant is selected from (C8-C 20 ) alkyl betaine, (C8-C 20 )alkylamido (C2-C8) alkyl betaine and mixtures thereof.

[0054] More preferably, the amphoteric surfactant is selected from cocamidopropyl betaine, coco betaine and mixtures thereof.

[0055] Advantageously, the amphoteric surfactant is present in the composition in an amount ranging from 0.5 to 20 wt.%, preferably from 1 to 15 wt.%, more preferably from 2 to 10 wt.%, relative to the total weight of the composition.

[0056] Thickener Optionally, the composition according to the invention comprises at least one thickener.

[0057] The thickener may be any hydrophilic thickener useful for thickening the aqueous phase of cosmetic compositions in the art.

[0058] In one embodiment, the composition according to the invention is an AMPS polymer, such as ammonium polyacryloyldimethyltaurate.

[0059] Those skilled in the art can adjust the amount of the thickener as needed. For example, the thickener is present in the composition in an amount ranging from 0.1 wt.% to 10 wt.%, preferably from 1 wt.% to 5 wt.%, relative to the total weight of the composition.

[0060] pH Adjusters The composition of the present invention has a pH of 3.5-5.0, preferably 3.8.

[0061] In order to adjust the pH of the composition according to the invention, a pH adjusting agent may be added.

[0062] As examples of pH adjusters, citric acid and sodium hydroxide may be mentioned.

[0063] Those skilled in the art can adjust the amount of the pH adjuster as needed.

[0064] Water Phase The compositions according to the invention comprise at least one aqueous phase.

[0065] According to a preferred embodiment, the composition of the invention is an aqueous solution.

[0066] The aqueous phase of the composition according to the invention comprises water and optionally one or more water-miscible or at least partially water-miscible compounds, such as C2 to C8 lower polyols or monools, such as ethanol and isopropanol.

[0067] The term "polyol" is understood to mean any organic molecule comprising at least two free hydroxyl groups. Examples of polyols that may be mentioned include diols, such as butanediol, propylene glycol and isoprene glycol, caprylyl glycol; glycerol (ie glycerin) and polyethylene glycol.

[0068] The aqueous phase may also contain any conventional water-soluble or water-dispersible additives as mentioned hereinafter.

[0069] The aqueous phase may represent 30 to 98 wt.%, preferably 30 to 95 wt.%, better still 50 to 90 wt.% and even better still 60 to 90 wt.% relative to the total weight of the composition.

[0070] Additional Ingredients Optionally, the composition according to the present invention may further comprise one or more additional ingredients.

[0071] A person skilled in the art can adjust, by means of routine manipulation, the type and amount of additional ingredients present in the compositions according to the invention so that the desired cosmetic and foaming properties of these compositions are not adversely affected by the additional ingredients.

[0072] According to a preferred embodiment, the invention relates to a composition for cleaning keratin materials having a pH ranging from 3.5 to 5.0, comprising, in the aqueous phase, relative to the total weight of the composition: a) 5 to 15 wt.% of at least one linear α-olefin sulfonate of formula (II): in: - R is a saturated straight-chain alkyl group containing 4 to 20 carbon atoms, in particular 6 to 18 carbon atoms, or even 8 to 14 carbon atoms and better still 10 to 12 carbon atoms; - M is a cosmetically acceptable cation selected from ammonium cations, cations derived from alkali metals or alkaline earth metals, cations derived from organic amines (e.g. alkanolamines); and in particular Na + or K + ; b) 3 wt.% to 15 wt.% of at least one organic acid selected from glycolic acid, citric acid, lactic acid, tartaric acid, malic acid, mandelic acid, salicylic acid and 5-n-octanoylsalicylic acid; and c) 2 wt.% to 10 wt.% of at least one amphoteric surfactant selected from (C8-C 20 ) alkyl betaine, sulfo betaine, (C8-C 20 (C2-C8 alkyl) betaine and (C8-C 20 (C2-C8 alkyl) sulfobetaine.

[0073] Methods and uses The composition according to the invention may be used in a method for cleansing keratin materials, such as the skin, in particular the face, by application to the keratin materials.

[0074] The composition according to the invention may be applied by any means allowing uniform distribution, in particular using the fingers, or cotton balls, sticks, brushes, gauze or spatulas, and may be removed by washing with water.

[0075] The compositions of the present invention may be implemented to improve the overall condition of the epidermis, particularly the skin.

[0076] Therefore, according to another aspect, the present invention relates to a method for cleansing keratin materials, in particular the skin, comprising applying to keratin materials, in particular the skin, a composition according to the invention and rinsing said composition after an optional period of time.

[0077] The invention is illustrated in greater detail by the following examples, which are given as non-limiting illustrations.

[0078] Percentages are by weight based on active ingredient or active substance.

[0079] In the following examples, weight percentages are indicated relative to the total weight of the composition. Example

[0080] Example 1 : Preparation Example Compositions according to the inventive formulation (inv.) and compositions according to the comparative formulation (comp.) were prepared comprising the ingredients shown in Table 1, wherein all amounts are expressed as weight percentages of active substances relative to the total weight of the respective composition.

[0081] The composition according to the above listed formulation is prepared according to the preparation methods known in the cosmetics field.

[0082] Example 2 : Evaluation of the properties of the composition according to the above formula Stability was determined after storage for one month at 4°C, 25°C (room temperature or RT), 40°C or 45°C.

[0083] Stability tests were also performed under sunlight testing and during several cycles.

[0084] The stability under sunlight test was carried out by leaving the cosmetic composition of the present invention in a Suntest CPS+ produced by Atlas for 24 hours.

[0085] Cyclic stability testing was performed with a -20°C to 20°C cycle every 24 hours for 10 days.

[0086] The compositions according to the invention and the compositions according to the comparative formulations listed above were evaluated for their foaming and rinsing abilities.

[0087] The solution is as follows: a. Clean your palms with cleansing cream; Wet your palms and place 1.0 g of the above composition on one palm; b. Add 1g of water and then rub 20 circles between your palms; Add another 1g of water; and c. Rub another 20 circles between your palms; d. Evaluate the volume and density of the foam by simply observing and pressing the foam between the palms; Transfer the foam to the back of one hand and rinse off the foam with water from your other hand; e. Rinseability was evaluated by the number of rinses required to obtain an immediate squeaky sensation.

[0088] Lathering (including volume and density) and rinsing were scored by 20 consumers based on the following criteria.

[0089] The effects of the compositions according to the inventive formulation and the compositions according to the comparative formulation listed above on anti-acne, oil control and skin texture improvement were evaluated by 20 consumers (10 males, 10 females) aged 18-35 years with oily or combination to oily skin as follows: the above formulations were applied over a period of 7 days, all of whom had concerns about acne, roughness, dull skin or pores that required immediate treatment.

[0090] The evaluation results are as follows: N / A: Not rated.

[0091] It can be seen that the compositions according to inventive formulas 1 to 3 all have good foaming ability and rinsing ability. In addition, the compositions according to inventive formulas 2 to 3 are stable for at least 2 menstrual periods.

[0092] On the other hand, the composition according to the comparative formulation did not have good foaming ability.

Claims

1. A composition for cleaning keratin materials having a pH of 3.5 to 5.0, comprising in an aqueous phase: a) at least one linear α-olefin sulfonate as an anionic surfactant; and b) at least one organic acid as cosmetic active ingredient.

2. The composition according to claim 1, wherein the linear α-olefin sulfonate is selected from those of formula (I): R-CH2-CH=CH-(CH2) n -SO3M(I) in: - R is a saturated straight-chain alkyl group containing 4 to 30 carbon atoms, in particular 6 to 20 carbon atoms, or even 8 to 18 carbon atoms and better still 10 to 14 carbon atoms; - n is an integer between 0 and 10, preferably between 1 and 4, and even better still n=1; - M is a cosmetically acceptable cation, in particular chosen from ammonium cations, cations derived from alkali metals or alkaline earth metals, cations derived from organic amines such as alkanolamines; preferably those derived from alkali metals; and in particular Na + or K + .

3. The composition according to claim 1 or 2, wherein the linear α-olefin sulfonate has the structure of formula (II): in: - R is a saturated straight-chain alkyl group containing 4 to 20 carbon atoms, in particular 6 to 18 carbon atoms, or even 8 to 14 carbon atoms and better still 10 to 12 carbon atoms; - M is a cosmetically acceptable cation, in particular chosen from ammonium cations, cations derived from alkali metals or alkaline earth metals, cations derived from organic amines such as alkanolamines; preferably those derived from alkali metals or alkaline earth metals; and in particular Na + or K + .

4. The composition according to any one of claims 1 to 3, wherein the linear α-olefin sulfonate is present in an amount ranging from 1 wt.% to 20 wt.%, preferably from 4 wt.% to 18 wt.%, and more preferably from 5 wt.% to 15 wt.%, relative to the total weight of the composition.

5. A composition according to any one of claims 1 to 4, wherein the organic acid glycinate surfactant is selected from saturated and unsaturated monocarboxylic acids, saturated and unsaturated dicarboxylic acids, saturated and unsaturated tricarboxylic acids; α-hydroxy acids and β-hydroxy acids of monocarboxylic acids; α-hydroxy acids and β-hydroxy acids of dicarboxylic acids; α-hydroxy acids and β-hydroxy acids of tricarboxylic acids; keto acids, α-keto acids, β-keto acids of polycarboxylic acids, polyhydroxymonocarboxylic acids, polyhydroxydicarboxylic acids or polyhydroxytricarboxylic acids; and (3-hydroxy-2-pentylcyclopentyl)acetic acid.

6. The composition according to any one of claims 1 to 5, wherein the organic acid is present in an amount ranging from 1 wt.% to 30 wt.%, preferably from 2 wt.% to 20 wt.%, more preferably from 3 wt.% to 15 wt.%, relative to the total weight of the composition.

7. The composition according to any one of claims 1 to 6, further comprising at least one amphoteric surfactant.

8. The composition according to claim 7, wherein the amphoteric surfactant is selected from (C8-C 20 ) alkyl betaine, sulfo betaine, (C8-C 20 (C2-C8 alkyl) betaine and (C8-C 20 (C2-C8 alkyl) sulfobetaine.

9. The composition of claim 7, wherein the amphoteric surfactant is selected from the group consisting of cocamidopropyl betaine, coco betaine and mixtures thereof.

10. The composition according to claim 7, wherein the amphoteric surfactant is present in an amount ranging from 0.5 wt.% to 20 wt.%, preferably from 1 wt.% to 15 wt.%, relative to the total weight of the composition.

11. The composition according to any one of claims 1 to 10, further comprising at least one thickener.

12. A composition for cleaning keratin materials having a pH of from 3.5 to 5.0, comprising, in the aqueous phase, relative to the total weight of the composition: a) 5 to 15 wt.% of at least one linear α-olefin sulfonate of formula (II): in: - R is a saturated straight-chain alkyl group containing 4 to 20 carbon atoms, in particular 6 to 18 carbon atoms, or even 8 to 14 carbon atoms and better still 10 to 12 carbon atoms; - M is a cosmetically acceptable cation selected from ammonium cations, cations derived from alkali metals or alkaline earth metals, cations derived from organic amines such as alkanolamines; and especially Na + or K + ; b) 3 wt.% to 15 wt.% of at least one organic acid selected from glycolic acid, citric acid, lactic acid, tartaric acid, malic acid, mandelic acid, salicylic acid and 5-n-octanoylsalicylic acid; and c) 2 wt.% to 10 wt.% of at least one amphoteric surfactant selected from (C8-C 20 ) alkyl betaine, sulfo betaine, (C8-C 20 (C2-C8 alkyl) betaine and (C8-C 20 (C2-C8 alkyl) sulfobetaine.

13. A method for cleansing keratin materials, in particular the skin, comprising applying to keratin materials, in particular the skin, a composition according to any one of claims 1 to 12, and rinsing the composition after an optional period of time.

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