Novel transparent cosmetic compositions for the hygiene and protection of skin and hair

Abstract

The present invention relates to a transparent cosmetic composition, which contains a mixture of surfactants, comprising a single anionic surfactant selected from alaninates, acyl glutamic acids and cosmetically acceptable salts thereof, a nonionic surfactant which is lauryl glucoside, alone or with at least one nonionic surfactant selected from alkyl glucosides, the alkyl radical of which contains from 8 to 16 carbon atoms, 1.5% to 2.5% by weight, relative to the total weight of the composition, of at least one amphoteric surfactant other than amidopropyl betaine, at least 65% by weight of water, and at least one cosmetically acceptable excipient. The composition does not contain an amphoteric surfactant from the class of amidopropyl betaine, and does not contain at least one surfactant containing a sulfate group. The composition is particularly suitable for the hygiene and protection of the skin and hair.

Description

[Technical field]

[0001] The present invention relates to novel transparent cosmetic compositions for the cleansing and / or protection of the skin and / or hair, and to the use of such compositions.The present invention also relates to a cosmetic treatment method for the hygiene and / or protection of the skin and / or hair using such compositions. [Background technology]

[0002] Cosmetic compositions intended for the cleaning and / or protection of the skin and / or hair must be effective, in other words, clean, lather and condition. More specifically, the main expectation of consumers is that the product produces a lot of lather and has a conditioning effect on the hair. Moreover, such compositions must contain as few controversial substances as possible or must not contain any of them at all, since consumers are becoming more and more cautious about cosmetic compositions. Therefore, consumers are looking for products that do not contain chemicals, preferring natural ingredients that are known to be better tolerated and compatible with the skin and are more environmentally friendly.

[0003] It is also preferred that such cosmetic compositions be transparent, as this suggests to many consumers a sense of safety and assurance of safety.

[0004] Moreover, such cosmetic compositions may be deployed in multiple packages. These may be tubes or pump dispensers that create restrictions in terms of releasing the product. This peculiarity generally leads the inventors to give the compositions specific viscosity values. Formulations that are too thick cannot be extruded, and those that are too runny will leak from the consumer's hands and will not correspond to the organoleptic qualities of a hygiene product.

[0005] Many cosmetic compositions proposed by the prior art for use on the body and hair contain sulfated surfactants, which guarantee a particular and interesting foaming effect and give the impression of gentle cleaning, but in reality, these surfactants are highly irritating to the skin, drying and allergenic.

[0006] Similarly, the presence of some amphoteric surfactants, such as amidopropyl betaines, especially cocamidopropyl betaine, can induce certain hypersensitivity reactions, such as skin irritation. Two impurities found in these amidopropyl betaines have been shown to be responsible for this bad reputation. These impurities are 3,3-dimethylaminopropylamine (DMAPA) and amidoamine, which are known for their irritant and sensitizing properties (Fowler et al., Contact Dermatitis 37, 276-281, 1997; Angelini et al., Contact Dermatitis 34, 248-252, 1996).

[0007] For good skin tolerance, these ingredients must therefore be used in low concentrations, but still always with associated risks, especially when dealing with consumers with pronounced skin sensitivities. [Prior art documents] [Non-patent literature]

[0008] [Non-Patent Document 1] Fowler et al., Contact Dermatitis 37, pp. 276-281, 1997. [Non-Patent Document 2] Angelini et al., Contact Dermatitis 34, pp. 248-252, 1996. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention aims to overcome the drawbacks of the cosmetic compositions proposed by the prior art, in particular those outlined above, by proposing a transparent cosmetic composition which contains as few as possible or no non-naturally occurring ingredients, has a physiological pH and is epidermis friendly, thus minimizing the risk of possible skin hypersensitivity, whilst having a foaming power that is at least as good as, or even better than, the cosmetic compositions of the prior art.

[0010] It is a further object of the present invention that the composition contains the minimum possible ingredients and is suitable for use on all skin types, including sensitive and atopic skin.

[0011] Another object of the present invention is that the clear composition has sufficient viscosity so that it does not slip off a user's hands when handled, allowing distribution of the clear composition through various types of packaging, particularly tubes and pump dispensers. [Means for solving the problem]

[0012] The present inventors have discovered that such objectives may be achieved by using a particular combination of surfactants, which unexpectedly may produce a clear cosmetic composition having particularly high foaming power, good viscosity, and a reduced risk of skin irritation compared to cosmetic compositions of the prior art.

[0013] "Good viscosity" of a composition is intended to mean a viscosity that allows said composition to be dispensed through a variety of packaging, particularly tubes and pump dispensers, and that does not spill off the consumer's hands when dispensing the composition.

[0014] According to a first aspect, the present invention proposes a transparent cosmetic composition, in particular suitable for topical application, in particular to the skin and hair. This transparent composition comprises: a mixture of surfactants, at least one anionic surfactant chosen from alaninates, acylglutamates, and cosmetically acceptable salts thereof, a non-ionic surfactant which is lauryl glucoside, alone or in association with at least one non-ionic surfactant chosen from alkyl glucosides, the alkyl radical of which contains from 8 to 16 carbon atoms; At least one amphoteric surfactant other than amidopropyl betaine A surfactant mixture comprising: - with at least one cosmetically acceptable excipient; Contains:

[0015] Furthermore, this transparent cosmetic composition preferably comprises at least 50% by weight of water relative to the total weight of the composition and is free of amphoteric surfactants from the class of amidopropyl betaines and surfactants containing at least one sulfate group.

[0016] In this specification, the term "cosmetically acceptable" is intended to mean that the salt or excipient is suitable for use by contact of the salt or excipient with human or animal cells, in particular with skin or hair cells. Preferably, the excipient has a pleasant odor, color and feel and does not cause unacceptable discomfort that may put users off using the composition according to the invention.

[0017] A clear composition is defined herein in the conventional manner as a composition having a turbidity of less than 20 NTU. Turbidity is measured using a HACH TL2310 Turbidity Meter. Prior to each turbidity measurement, correct adjustment of the instrument is confirmed by measuring two reference turbidities from StabCal's 0-4000 NTU reference calibration kit; these standards are selected to frame the expected values ​​of the samples.

[0018] In this specification, the term "at least one" means a single compound or a mixture of several such compounds. Thus, the mixture of surfactants of the composition according to the invention may be: a single anionic surfactant selected from alaninates, acyl glutamates, and cosmetically acceptable salts thereof, or a plurality of such anionic surfactants, - a single non-ionic surfactant which is lauryl glucoside or a plurality of non-ionic surfactants which include lauryl glucoside and one or more non-ionic surfactants selected from alkyl glucosides, the alkyl radical of which contains from 8 to 16 carbon atoms; - a single amphoteric surfactant other than amidopropyl betaine, or a plurality of such amphoteric surfactants other than amidopropyl betaine Contains:

[0019] Such a specific mixture of surfactants advantageously ensures high foaming power of the transparent cosmetic composition and good quality of the foam produced. Without assuming a phenomenon underlying this performance of the mixture of surfactants according to the invention, this performance can be attributed to the synergistic effect of the specific group of surfactants that these surfactants possess. This performance is advantageously obtained without the composition of any amphoteric surfactant of amidopropyl betaine type conventionally used in cosmetic compositions for the hygiene or protection of the skin and hair, which has the drawback of risk of skin irritation. The transparent composition obtained therefore does not create a risk of skin irritation or it greatly reduces the risk compared to the compositions of the prior art. Moreover, said mixture of surfactants gives the transparent cosmetic composition a good viscosity, in particular a viscosity that allows said composition to be free of thickeners, and this is achieved even when the composition comprises one or more cosmetically acceptable excipients, such as emollients, conditioners, solubilizers, fragrances, etc.

[0020] In the context of the present invention, the term "amidopropyl betaines" is intended to mean the following compounds: behenamidopropyl betaine, capryl / capramidopropyl betaine, cocamidopropyl betaine, isostearamidopropyl betaine, lauramidopropyl betaine, myristamidopropyl betaine, stearamidopropyl betaine, undecylenamidopropyl betaine, and amidopropyl betaines derived from almonds, apricots, avocados, babassu, rapeseed, coconut oil, sunflower oil, oats, olives, coconut oil, castor oil, soybeans, shea butter and wheat germ.

[0021] Furthermore, the transparent cosmetic composition according to the invention is in the form of a single-phase fluid composition, rather than in the form of an emulsion comprising an aqueous phase and a fatty phase, or a two-phase composition.

[0022] In particular embodiments, the invention also responds to the following features, realized separately or in each technically feasible combination:

[0023] According to a particular embodiment of the present invention, the transparent cosmetic composition according to the present invention does not contain any further component selected from fatty substances. According to another particular embodiment, the transparent composition comprises a total amount of further component(s) selected from fatty substances of not more than 2% by weight, preferably not more than 1% by weight, relative to the total weight of the composition. In a particular embodiment of the present invention, the transparent cosmetic composition contains a total content of further component(s) selected from fatty substances of between 0.001 and 2% by weight, in particular between 0.001 and 1% by weight, more particularly between 0.001 and 0.5% by weight, in particular between 0.001 and 0.2% by weight, relative to the total weight of the composition. The total content(s) of further component(s) selected from the fatty substances indicated above are such that the transparent cosmetic composition of the present invention can maintain a form other than that of an emulsion comprising an aqueous phase and a fatty phase.

[0024] In the sense of the present invention, "fatty substances" means organic compounds that are insoluble in water at 25° C. and 1 atm, in other words organic compounds that have a solubility of less than 5% by weight, preferably less than 1% by weight. Fatty substances are generally soluble under the same temperature and pressure conditions in organic solvents, such as chloroform, ethanol, benzene or petrolatum oil.

[0025] The expression "fatty substances" encompasses in particular fatty alcohols, fatty acid esters, fatty acids, fatty amides, mineral oils or waxes (or hydrocarbons), animal oils or waxes, or vegetable oils or waxes, and the like.

[0026] According to a particular embodiment of the present invention, the transparent cosmetic composition does not contain any emulsifiers. The transparent cosmetic composition in particular does not contain any emulsifiers, such as fatty acid monoesters of polyethylene glycol.

[0027] According to a particular embodiment of the present invention, the transparent composition that is an object of the present invention has a turbidity of less than 20 NTU for at least 12 months after preparation.Preferably, the transparent composition has a turbidity of less than 20 NTU for at least 24 months after preparation, and more preferably, the transparent composition has a turbidity of less than 20 NTU for at least 36 months after preparation.

[0028] According to a particular embodiment of the invention, the one or more anionic surfactants selected from the alaninates are preferably selected from sodium cocoyl alaninate or trisodium dicarboxymethyl alaninate.

[0029] According to a particular embodiment of the present invention, the one or more anionic surfactants selected from acylglutamic acid and its cosmetically acceptable salts are preferably selected from acylglutamic acid, the acyl group of which comprises a saturated or unsaturated, linear or branched hydrocarbon chain having from 8 to 30 carbon atoms, preferably from 10 to 20 carbon atoms, more preferably from 12 to 18 carbon atoms. The acyl group may be selected in particular from lauroyl, myristoyl, palmitoyl, stearoyl, olivoyl, cocoyl and oleoyl groups. The cosmetically acceptable salts of acylglutamic acid may be selected from alkali metal salts, alkaline earth metal salts and ammonium salts. The cosmetically acceptable salts of acylglutamic acid are, for example, selected from sodium salts, potassium salts, lithium salts or magnesium salts, with sodium and potassium salts being particularly preferred in the context of the present invention.

[0030] According to a particular embodiment of the present invention, one or more anionic surfactants selected from acyl glutamic acid and its cosmetically acceptable salts may be selected, for example, from the group consisting of compounds with the INCI names sodium cocoyl glutamate, disodium cocoyl glutamate, sodium myristoyl glutamate, sodium lauroyl glutamate, potassium lauroyl glutamate, potassium cocoyl glutamate and sodium stearoyl glutamate. Some anionic surfactants selected from acyl glutamic acid and its cosmetically acceptable salts may be used in the composition according to the present invention, which may contain, for example, any mixture of two or more of the abovementioned compounds.

[0031] Preferably, the composition according to the invention comprises a single anionic surfactant selected from alaninates, more preferably, the composition according to the invention comprises a single anionic surfactant which is sodium cocoyl alaninate.

[0032] According to a particular embodiment of the present invention, the transparent composition comprises a single non-ionic surfactant, which is preferably lauryl glucoside.

[0033] According to another particular embodiment of the invention, the transparent composition comprises at least one second nonionic surfactant chosen from alkylglucosides whose alkyl radical contains from 8 to 16 carbon atoms, the alkylglucosides being preferably chosen from compounds having the INCI names: octylglucoside and decylglucoside.

[0034] According to a particular embodiment of the invention, the one or more amphoteric surfactant(s) other than amidopropyl betaine is / are sodium caproamphoacetate, sodium caproamphopropionate, sodium capryloamphoacetate, sodium capryloamphopropionate, sodium cocoamphoacetate, sodium cocoamphopropionate, sodium isostearoamphoacetate, sodium isostearoamphopropionate, sodium lauroamphoacetate, sodium lauroamphopropionate, sodium oleoamphoacetate, sodium oleoamphopropionate, sodium stearoamphoacetate, stearoamphopropionic acid, tallowamphoacetate disodium, wheat germ amphoacetate, disodium caproamphodiacetate, disodium caproamphodipropionate, disodium capryloamphodiacetate, disodium cocoamphodiacetate, disodium isostearoamphodiacetate, disodium lauroamphodiacetate, disodium oleoamphodipropionate, disodium capryloamphodipropionate, disodium cocoamphodipropionate, disodium isostearoamphodipropionate, disodium lauroamphodipropionate, disodium stearoamphodiacetate, disodium tallowamphodiacetate and disodium wheat germ amphodiacetate.

[0035] Preferably, said at least one amphoteric surfactant other than amidopropyl betaine is selected from lauryl betaine, cocobetaine, sodium cocoamphoacetate and disodium cocoamphodiacetate, or mixtures thereof.

[0036] Preferably, said at least one amphoteric surfactant other than amidopropyl betaine is selected from lauryl betaine, cocobetaine, and sodium cocoamphoacetate, or mixtures thereof.

[0037] According to a particular embodiment of the present invention, the transparent composition comprises at least 50% by weight of water relative to the total weight of the composition. Preferably, the composition according to the present invention comprises at least 55% by weight of water relative to the total weight of the composition. Preferably, the composition according to the present invention comprises at least 60% by weight of water relative to the total weight of the composition, more preferably, the composition according to the present invention comprises at least 65% by weight of water relative to the total weight of the composition. Preferably, the transparent cosmetic composition according to the present invention comprises at least 70% by weight of water relative to the total weight of the composition.

[0038] In certain embodiments of the present invention, the clear cosmetic composition does not contain ethylenediaminetetraacetic acid (EDTA).

[0039] According to a particular embodiment of the invention, the transparent composition according to the invention does not contain any surfactant of the type having isethionic acid or an isethionic acid group, in particular a surfactant chosen from acylisethionates or their salts, such as the substances with the INCI name sodium cocoyl isethionate, without modifying the performance of the transparent composition, advantageously reducing in said composition the presence of compounds conventionally used in cosmetic compositions for the hygiene or protection of the skin and hair, which have the drawback of being of non-natural origin.

[0040] According to a particular embodiment of the invention, the transparent composition does not contain any surfactant of the type having sulfosuccinic acid or sulfosuccinic acid groups, in particular surfactants chosen from alkylsulfosuccinic acids or their salts, such as the substances with the INCI name Lauryl Sulfosuccinic Acid, again without modifying the performance of the transparent composition, advantageously reducing in said composition the presence of compounds conventionally used in cosmetic compositions for the hygiene or protection of the skin and hair, which have the drawback of being of non-natural origin.

[0041] According to a particular embodiment of the present invention, the transparent composition does not contain a surfactant that contains at least one sulfate group, in other words a -O-SO3H or -O-SO2-O- group, such as laureth sulfate or lauryl sulfate. This advantageously reduces the presence in said composition of compounds that are conventionally used in cosmetic compositions for the hygiene or protection of the skin and hair, and that have the drawback of being of non-natural origin, without modifying the performance of the transparent composition. Furthermore, sulfated surfactants have a particular interesting foaming power, but they are aggressive to the epidermis. Thus, the absence of sulfated surfactants in the transparent composition, which is the object of the present invention, advantageously reduces the risk of attack on the epidermis of the user.

[0042] More generally, the transparent composition according to the present invention preferably contains as few surfactants as possible.Thus, in a particular embodiment of the present invention, the transparent composition contains 6 or less surfactants, preferably 5 or less surfactants, more preferably 4 or less surfactants, preferably 3 surfactants.As already indicated, high foaming power and other listed advantages can be obtained by a mixture of surfactants that contains a single compound from each of the three defined families of surfactants (one anionic surfactant selected from alaninates and / or acyl glutamic acids and their cosmetically acceptable salts, a nonionic surfactant that is lauryl glucoside, and one amphoteric surfactant other than amidopropyl betaine), which advantageously allows to minimize the number of ingredients present in the composition and therefore reduce the manufacturing cost of the composition.

[0043] In a preferred embodiment of the invention, the content of said mixture of surfactants is between 5 and 18% by weight, preferably between 6 and 16% by weight, more preferably between 8 and 15% by weight, relative to the total weight of the transparent composition. Such a value range makes it possible to obtain good foaming power of the composition, good quality of the foam generated and good viscosity of the composition, while at the same time reducing the production costs of the composition.

[0044] The total content of said at least one anionic surfactant chosen from alaninate or acylglutamic acid and its cosmetically acceptable salts is preferably between 1.5 and 5% by weight, preferably between 2 and 4% by weight, relative to the total weight of the composition.

[0045] The total content of lauryl glucoside as the sole nonionic surfactant of the composition is preferably between 3 and 10% by weight, preferably between 5 and 8% by weight relative to the total weight of the composition.

[0046] In one particular embodiment, the total content of non-ionic surfactants consisting of lauryl glucoside associated with at least one non-ionic surfactant chosen from alkyl glucosides, whose alkyl radical contains from 8 to 16 carbon atoms, is preferably between 3 and 10% by weight, preferably between 5 and 8% by weight, relative to the total weight of the composition.

[0047] The total content of said at least one amphoteric surfactant other than amidopropyl betaine preferably ranges from 0.5 to 3% by weight, more preferably from 1.5 to 2.5% by weight, relative to the total weight of the composition.

[0048] According to a preferred embodiment of the present invention, the transparent cosmetic composition comprises: a mixture of surfactants, a single anionic surfactant selected from alaninates, acylglutamates, and cosmetically acceptable salts thereof; a non-ionic surfactant which is lauryl glucoside, alone or in association with at least one non-ionic surfactant chosen from alkyl glucosides, the alkyl radical of which contains from 8 to 16 carbon atoms; from 1.5% to 2.5% by weight relative to the total weight of the composition of at least one amphoteric surfactant other than amidopropyl betaine A surfactant mixture comprising: - with at least one cosmetically acceptable excipient; wherein the composition comprises at least 65% by weight of water relative to the total weight of the composition, the content of the mixture of surfactants is between 5 and 18% by weight relative to the total weight of the composition, and the composition does not contain an amphoteric surfactant from the class of amidopropyl betaines and a surfactant containing at least one sulfate group.

[0049] In certain embodiments of the present invention, the clear composition has a viscosity greater than 800 cPs, preferably between 800 and 5500 cPs.

[0050] In a particular embodiment of the present invention, the transparent composition does not contain a thickener, in order to minimize the number of ingredients in the formulation.As already explained, the mixture of surfactants used in the transparent composition advantageously gives this composition a good viscosity, in particular a viscosity that allows the composition to be free of thickeners, even when the composition contains one or more cosmetically acceptable excipients, such as emollients, conditioning agents, solubilizers, fragrances, etc.Thus, the number of ingredients in the composition is reduced, and therefore the associated manufacturing costs are also reduced.

[0051] However, in other particular embodiments of the present invention, the composition comprises at least one thickening agent.

[0052] In the sense of the present invention, the term "thickening agent" preferably means alginic acid, carrageenan, cellulose, starch and gums selected from diutan gum, gellan gum, sclerotium gum, succinoglycan gum, gum arabic, locust bean gum, tamarind seed gum and Caesalpinia spinosa gum.

[0053] In certain embodiments of the present invention, said at least one cosmetically acceptable excipient is selected from emollients, conditioners, solubilizers, fragrances, preservatives, and mixtures thereof.

[0054] In a particular embodiment of the invention, the transparent composition contains one or more softeners, especially chosen from glycerol, diglycerol or sorbitol.

[0055] In a particular embodiment of the present invention, the transparent composition contains one or more regulators, in particular selected from guar, polyquaternium, polyglyceryl, polysaccharide, squalane, etc. Preferably, the regulator is guar. According to a preferred embodiment of the present invention, the total content of regulator(s) is between 0.1 and 1% by weight relative to the total weight of the transparent composition.

[0056] In a particular embodiment of the invention, the transparent composition according to the invention contains one or more solubilizers chosen from the family of polyglyceryls, such as, in particular, Polyglyceryl-4 caprate, Polyglyceryl-6 caprylate, Polyglyceryl-3 cocoate, Polyglyceryl-6 ricinoleate, glyceryl oleate, coco glucoside, etc.

[0057] In a particular embodiment of the invention, the transparent composition contains one or more cosmetic active ingredients, in particular for topical application, selected from, for example, hydrating agents, antioxidants, vitamins, etc.

[0058] The total content of cosmetically active ingredient(s) in the transparent composition according to the invention is preferably between 0.05 and 3% by weight relative to the total weight of the composition.

[0059] In particular embodiments of the invention, the transparent composition comprises one or more cosmetic active ingredient(s) selected from hyaluronic acid, oat juice, helichrysum extract, helichrysum essential oil, Limnanthes oil, in particular meadowfoam seed oil, oat seedlings, floral acids such as the products sold under the name Acides de Fleurs®, Garcinia extract, Milk thistle oil, niacinamide, Edelweiss extract such as the products sold under the name Alpaflor® Edelweiss, Cinchona extract, caffeine, peony extract, mango butter and citron extract, such a list not being in any way limiting to the invention.

[0060] The transparent composition according to the present invention, in its desired form, can be prepared by any conventional cosmetic composition preparation method.A particularly preferred preparation method in the context of the present invention is to introduce each of the surfactants successively into the water of the formulation at a slow speed into a mixer, then optionally add other excipients and / or active ingredients, and finally stir / homogenize the formulation.Accordingly, the pH of the formulation can also be adjusted if necessary.

[0061] In certain embodiments in which the clear cosmetic composition includes at least one modifier, this modifier is preferably pre-introduced into the water of the formulation under vigorous agitation.

[0062] The transparent compositions object of the present invention may be used on all keratinous materials, such as the skin, the scalp, the hair, the eyelashes, the eyebrows, the nails or the mucous membranes, and may in particular be packaged in the form of hygiene products, for example in the form of products for cleaning the skin, the mucous membranes and / or the hair, in particular in the form of products for cleaning and / or removing make-up from the skin, in particular from the face and / or body, in the form of shower products, in the form of shampoo solutions.

[0063] Another aspect of the present invention relates to the use of a transparent cosmetic composition according to the present invention as a non-therapeutic cosmetic for cleansing and / or protecting the skin of an individual, in particular the skin of the body and / or the face and / or the scalp, and / or the hair, preferably by topical application.

[0064] This use preferably comprises: - applying a transparent composition to the skin and / or hair, preferably pre-moistened; - creating a lather, in particular by rubbing the skin and / or hair to which the composition has been applied, - After any leaving time and / or any massage, preferably with a rinse step with water. The method includes the successive steps of:

[0065] These steps may be performed, for example, once or twice a day, for example, in the morning and evening, or as often as needed.

[0066] The clear compositions according to the invention may be used in particular for cleansing and / or protecting sensitive or atopic skin.

[0067] In the present specification, sensitive skin refers to skin that is subject to irritation or allergic reactions due to various internal and external non-immune factors. The term atopic skin refers to skin that is subject to inflammatory disorders characterized by dry skin associated with itching, such as in the case of eczema or atopic dermatitis.

[0068] The present invention also relates to a non-therapeutic cosmetic treatment method for the hygiene and / or protection of the skin and / or hair of an individual with a transparent cosmetic composition according to the present invention, said method comprising: - applying said transparent composition to the skin and / or hair, which is preferably pre-moistened; - rubbing the composition onto the skin and / or hair to create a lather; - preferably with a water rinse step; The method includes the successive steps of:

[0069] This method may respond to any feature or combination of features explained above with reference to the cosmetic use of the composition according to the invention.

[0070] The features and advantages of the invention will become more apparent in view of the following examples of implementations, given solely as illustrative and non-limiting examples of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0071] 1 / Composition Examples

[0072] A transparent cosmetic composition according to the invention intended as a cosmetic treatment for the hygiene and protection of hair has the properties listed in Table 1 below.

[0073] JPEG2025514299000001.jpg112170 Table 1 - Examples of transparent compositions according to the invention for hair hygiene and protection

[0074] Further examples of transparent compositions according to the invention intended for cosmetic treatment for the hygiene and protection of the skin of the face and / or body are given in Table 2 below.

[0075] JPEG2025514299000002.jpg82170 Table 2 - Examples of transparent compositions according to the invention for the hygiene and protection of the skin of the face and / or body

[0076] 2 / Characterization of the composition according to the invention

[0077] The transparent compositions are evaluated according to the following criteria: - Foaming power (quantity / product): foam height, foam creaminess, foam softness -viscosity -pH: Measurement is performed using a pH meter -Stability over time - Sensory characteristics (color, aroma)

[0078] For this purpose, the following operating protocol is implemented.

[0079] To evaluate the foam height, a 250 ml graduated measuring tube with a stopper is used, with an outer diameter of 38.9 cm and a height of 36 cm. 0.5 g of the composition is placed in the tube and demineralized water is added to make up to 50 ml. The tube is stoppered and then shaken vigorously 10 times. The foam height is read off and expressed in mm.

[0080] The results obtained with various anionic surfactants are shown in Table 3 below.

[0081] JPEG2025514299000003.jpg213170 Table 3 - Various criteria ratings for transparent compositions according to the present invention depending on the different selected anionic surfactants

[0082] It can be seen that Compositions 1, 2 and 3 have a rather interesting foam height and expected viscosity. The greatest height is obtained with sodium cocoyl alaninate, and it is interesting to note that the foam appears particularly creamy.

[0083] The results obtained with various non-ionic surfactants are shown in Table 4 below.

[0084] JPEG2025514299000004.jpg243170Table 4 - Various criteria ratings for a transparent composition according to the invention (composition 4) and compositions not according to the invention (compositions 5 and 6) depending on the different non-ionic surfactants selected

[0085] It can therefore be seen that when using a single non-ionic surfactant to produce a transparent composition according to the invention, only lauryl glucoside makes it possible to obtain a composition according to the invention (composition 4), in other words a composition having a certain viscosity, in particular a viscosity of more than 800 cPs. In fact, in the presence of coco glucoside or decyl glucoside as the only non-ionic surfactant, the composition proves to be too loose (compositions 5 and 6). Therefore, the foam height could not be measured.

[0086] The results obtained with various amphoteric surfactants are shown in Table 5 below.

[0087] JPEG2025514299000005.jpg241170 Table 5 - Various criteria ratings for transparent compositions according to the present invention depending on the different amphoteric surfactants selected

[0088] It can be seen that Compositions 4, 7, 8 and 9 all have similar foam heights. The amphoteric surfactant does not appear to affect foaming power.

[0089] 3 / Comparative test with compositions from the prior art

[0090] A composition containing sodium cocoamphoacetate, glycerol, lauryl glucoside, sodium cocoyl glutamate and sodium lauryl glucose carboxylate, sold under the name PLANTAPON® SF by BASF, has been evaluated for foam height and viscosity.

[0091] The composition PLANTAPON® SF is tested under the same total concentration of surfactant as the transparent cosmetic composition object of the present invention.

[0092] For this purpose, the same operating protocol is carried out as in point 2 / above.

[0093] In other words, to evaluate the foam height, a 250 ml graduated measuring tube with a stopper is used with an outer diameter of 38.9 cm and a height of 36 cm. 0.5 g of the composition PLANTAPON® SF is placed in this tube and demineralized water is added to make up to 50 ml. The viscosity of the composition measured is 1158 cPs. The tube is stoppered and then shaken vigorously 10 times. The foam height is read and expressed in mm. The foam height obtained is 180 mL.

[0094] In conclusion, the transparent cosmetic composition object of the present invention, which contains only a single anionic surfactant selected from alaninate, acyl glutamic acid and its cosmetically acceptable salts, has a good foaming power similar to, if not better than, the composition PLANTAPON® SF, which contains two anionic surfactants (sodium cocoyl glutamate and lauryl glucose carboxylic acid).The transparent cosmetic composition of the present invention is therefore just as effective, if not more effective, than PLANTAPON SF, and, above all, is more economical, since said efficacy is achieved with fewer ingredients.

[0095] More generally, it should be noted that the implementations and embodiments of the invention considered above are described as non-limiting examples, and thus other variations are contemplated.

Claims

1. A transparent cosmetic composition, the transparent cosmetic composition comprising: - a mixture of surfactants, a single anionic surfactant selected from alaninates, acylglutamates, and cosmetically acceptable salts thereof; a non-ionic surfactant which is lauryl glucoside, alone or in association with at least one non-ionic surfactant chosen from alkyl glucosides, the alkyl radical of which contains from 8 to 16 carbon atoms; from 1.5% to 2.5% by weight relative to the total weight of the composition of at least one amphoteric surfactant other than amidopropyl betaine A surfactant mixture comprising: at least one cosmetically acceptable excipient; 1. A transparent cosmetic composition comprising at least 65% by weight of water relative to the total weight of the composition, the content of the mixture of surfactants being between 5 and 18% by weight relative to the total weight of the composition, and the composition being free of amphoteric surfactants from the class of amidopropyl betaines and of surfactants comprising at least one sulfate group.

2. 2. The transparent cosmetic composition according to claim 1, wherein the total content of anionic surfactants selected from alaninates or acyl glutamic acids, and their cosmetically acceptable salts, is between 1.5 and 5% by weight relative to the total weight of the composition.

3. 3. A transparent cosmetic composition according to claim 1, wherein the content of lauryl glucoside, as the sole nonionic surfactant, of the composition is between 3 and 10% by weight relative to the total weight of the composition.

4. 4. A transparent cosmetic composition according to claim 1, wherein the anionic surfactant selected from alaninates is preferably selected from sodium cocoyl alaninate or trisodium dicarboxymethyl alaninate.

5. 5. A transparent cosmetic composition according to claim 1, wherein the at least one anionic surfactant selected from acylglutamic acids and cosmetically acceptable salts thereof is preferably selected from acylglutamic acids, the acyl group of which comprises a saturated or unsaturated, linear or branched hydrocarbon chain of from 8 to 30 carbon atoms.

6. 6. The transparent cosmetic composition according to claim 1, wherein the at least one amphoteric surfactant is selected from cocobetaine, lauryl betaine, sodium cocoamphoacetate and disodium cocoamphodiacetate.

7. 7. The composition according to claim 1, wherein the at least one cosmetically acceptable excipient is selected from emollients, conditioners, solubilizers, fragrances and mixtures thereof.

8. 8. The transparent cosmetic composition of claim 1, wherein the composition does not contain a thickening agent.

9. 9. The transparent cosmetic composition according to claim 1, further comprising at least one conditioning agent selected from guar, polyquaterniums, polyglyceryls, polysaccharides and squalane.

10. 10. The transparent cosmetic composition according to claim 9, wherein the total content of the conditioning agent(s) is between 0.1 and 1 wt. %, relative to the total weight of the composition.

11. 11. A transparent cosmetic composition according to any one of claims 1 to 10, comprising at least one cosmetically active ingredient selected from vitamins, hyaluronic acid, oat juice, Helichrysum extract, Helichrysum essential oil, Limnanthes oil, in particular Meadowfoam seed oil, oat seedling, floral acid, Garcinia extract, Silybum marianum oil, niacinamide, edelweiss extract, Quinquina extract, caffeine, peony extract, mango butter and citron extract.

12. 12. The transparent cosmetic composition according to any one of claims 1 to 11, packaged in the form of a shower gel, a shampoo liquid, a foaming gel for the face and / or the body.

13. 13. The transparent cosmetic composition according to any one of the preceding claims, wherein the transparent composition has a viscosity of more than 800 cPs, preferably between 800 and 5500 cPs.

14. 14. Use of a transparent cosmetic composition according to any one of claims 1 to 13 as a non-therapeutic cosmetic for cleansing and / or protecting the skin and / or hair.

15. 15. The non-therapeutic cosmetic use according to claim 14 for the cleansing and / or protection of sensitive skin.

16. 14. A method of treating with a non-therapeutic cosmetic for the hygiene and / or protection of skin and / or hair with a transparent cosmetic composition according to any one of claims 1 to 13, said method comprising the steps of: - applying said transparent composition to the preferably pre-moistened skin and / or hair; - forming a lather by rubbing the composition on the skin and / or the hair; - Rinse step and The method comprises the successive steps of:

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