WO2022003000A1

WO2022003000A1 - Two-phase composition comprising an alkylpolyglycoside surfactant, a particular diol and an alkane, ester or ether compound comprising from 15 to 30 carbon atoms

Info

Publication number: WO2022003000A1
Application number: PCT/EP2021/067952
Authority: WO
Inventors: Vanessa Duffet; Laurence ABISSET; Emmanuelle CAMBLONG; Virginie FAUGUE
Original assignee: L'oreal
Priority date: 2020-07-01
Filing date: 2021-06-30
Publication date: 2022-01-06
Also published as: FR3112076A1; FR3112076B1; EP4175605A1

Abstract

The present patent application relates to a two-phase composition consisting of an aqueous phase and of a nonsilicone oily phase which are separate and transparent, characterized in that the aqueous phase comprises water, at least one alkylpolyglycoside surfactant, and at least one diol including at least 5 carbon atoms, preferably of C5-C10, and the oily phase comprises at least 75% by weight, relative to the total weight of the oily phase representing 100%, of at least one alkane, ether or ester compound comprising from 15 to 30 carbon atoms. The present invention also relates to the use of plant oil in such a two-phase composition for, after shaking said composition, slowing down the rate of demixing of the two phases of the composition and/or for improving the sharpness of the interface between the two phases and/or prolonging the sharpness of the interface at rest of the two-phase product after several cycles of use of the two-phase product.

Description

Title: Two-phase composition comprising an alkylpolyglycoside surfactant, a particular diol and an alkane, ester or ether compound comprising from 15 to 30 carbon atoms

Technical field

[0001] The present invention relates to a composition for topical application, consisting of two separate phases, an aqueous phase and an oily phase, which emulsifies easily by shaking and which undergoes phase separation rapidly after the shaking is stopped. The present invention also relates to the use of said composition in cosmetics or dermatology, and notably for removing makeup from, cleansing and/or caring for the skin, mainly of the face, and in particular of the lips and/or the eyes, and for body care and/or haircare.

Context of the invention

[0002] Compositions of this type consisting of two separate phases, notably an aqueous phase and an oily phase which are separate and not emulsified one in the other at rest, are generally denoted by the term “two-phase compositions” or even more simply “two- phase product”. They are distinguished from emulsions by the fact that, at rest, the two phases are separate instead of being emulsified one in the other. Thus, the two phases are separated at rest by a single interface, whereas, in emulsions, one of the phases is dispersed in the other in the form of a multitude of droplets, and the interfaces are thus manifold, these interfaces generally being stabilized with emulsifying surfactants and/or emulsifying polymers. The use of two-phase compositions requires prior shaking in order to form an extemporaneous emulsion. This emulsion must be of a quality and a stability that are sufficient to allow uniform application of the two phases but such that, at rest, the two phases separate rapidly and regain their initial state, this phenomenon being more commonly known as “phase separation”.

[0003] Rapid phase separation (or demixing) of the two phases after they have been used constitutes one of the qualities desired for two-phase compositions. Specifically, obtaining rapid phase separation is desirable for various reasons, notably since poor separation of the two phases is perceived by users as being unesthetic.

[0004] In addition, it is increasingly sought to have available clear, i.e. transparent, compositions, since, just like water, transparency is the symbol of purity and thus of cleanliness. Transparent compositions are thus particularly appreciated by users; these compositions are generally presented in transparent containers and opacity of the two phases is esthetically detrimental. [0005] The use, in two-phase compositions, of silicone oils, for instance cyclopentasiloxane, in a suitable amount may make it possible to obtain two-phase compositions consisting of two immiscible separate phases which form, after shaking, an emulsion, while at the same time maintaining the properties desired for the two-phase compositions, i.e. rapid phase separation into two transparent phases.

[0006] Two-phase compositions based on cyclic silicone oils have already been described, for example, in EP 0 370 856 and EP 0 603 080, notably for removing makeup from the eyes.

[0007] However, consumers are increasingly in search of cosmetic products formed from constituents that are natural or of natural origin, in particular of products not comprising any silicone compounds.

[0008] FR 2 939662 proposes a two-phase composition based on nonsilicone oils consisting of two separate immiscible phases, which, after shaking, gives a transparent emulsion, while at the same time maintaining the properties desired for two-phase compositions, i.e. rapid phase separation into two transparent phases and a sharp interface. The hydrophilic phase comprises at least 40% by weight of one or more polyols relative to the weight of hydrophilic phase and the oily phase comprises at least 5% by weight of one or more nonsilicone oils relative to the weight of oily phase, the amounts of polyols and of nonsilicone oils being such that the refractive indices of the oily and hydrophilic phases are substantially equal. In said document, the polyol is chosen from glycerol, glycols, sorbitol, sugars, and mixtures thereof. The glycols are chosen from methylpropanediol, 1,3-propanediol, butylene glycol, propylene glycol, isoprene glycol, dipropylene glycol, hexylene glycol and polyethylene glycols. In said document, the nonsilicone oil is chosen from fatty acid esters including from 8 to 29 carbon atoms, such as isodecyl neopentanoate, dicaprylyl ether, dicaprylyl carbonate, isopropyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-octyldodecyl stearate; linear hydrocarbons such as Parleam® oil and liquid petroleum jelly; hydrocarbon-based oils of plant origin such as apricot kernel oil and essential oils, fragrances, volatile linear alkanes, volatile linear alkanes comprising from 7 to 17 carbon atoms such as undecane, tridecane, and C8-C16 isoalkanes, for instance isododecane, isodecane and isohexadecane.

[0009] WO 2014/013420 describes a composition for topical application, consisting of two separate phases, a hydrophilic phase and an oily phase, which emulsify easily by shaking giving an emulsion and which undergo rapid phase separation after the shaking is stopped, having a perfectly sharp interface, without the presence of foam or of residual wisps considered by users as unesthetic and offputting, by using a hydrophilic phase comprising one or more non-ethoxylated alkylpolyglucosides in a given amount and an oily phase comprising one or more particular esters, chosen from esters of fatty acids with a chain length ranging from 8 to 18 carbon atoms and esters of fatty alcohols with a chain length ranging from 8 to 18 carbon atoms.

[0010] EP 3062761 describes a transparent two-phase composition consisting of two immiscible separate phases, comprising few or no silicone compounds, which, after shaking, gives an emulsion, while at the same time maintaining the properties desired for two-phase compositions, i.e. rapid phase separation into two transparent phases, a sharp interface after returning to rest, without the appearance of droplets which remain attached to the walls of the transparent container (page 2, lines 39-46 of the patent). The composition described in said document uses a combination of a branched alkane including from 8 to 18 carbon atoms and of a particular surfactant chosen from fatty acid esters of sugar and alkylpolyglucosides.

[0011] However, depending on the nonsilicone oils used, the contents of surfactants, and the possible polyols used, the makeup-removing efficiency on waterproof makeup occasionally proves to be insufficient, and the working qualities of the two-phase product have room for improvement. The reason for this is that the demixing (or separation) between the phases must not be too rapid, to allow an emulsion to remain formed on cotton wool for the time of removal of all of the makeup from the face, for example for at least 10 seconds and preferably at least 20 seconds. Conversely, the demixing must not be too slow either, and the interface must begin to be visible to the user in less than 1 minute. Finally, the interface between the phases must be perfectly sharp after returning to the initial state of the two-phase product. However, it is not uncommon in the existing two-phase products, notably after several cycles of use of the two-phase product, for foam, bubbles or whitish wisps to form at the interface, or else small droplets which remain attached to the walls of the transparent container, both in the aqueous phase and in the fatty phase. This phenomenon is visually offputting, and it is sought on the contrary to find each of the two phases intact and clear, and to have a perfectly sharp interface.

[0012] A need thus remains for a two-phase composition consisting of two immiscible separate phases, comprising few or no silicone compounds, which, after shaking, gives an emulsion, while at the same time maintaining the properties desired for two-phase compositions, i.e. rapid phase separation into two transparent phases, but slow enough for the emulsion to persist for the time of performing the makeup removal, a sharp interface after returning to rest, without the appearance of droplets which remain attached to the walls of the transparent container. [0013] Surprisingly, the Applicant has found that it is possible to obtain a transparent two- phase composition comprising few or no silicone compounds, which, after shaking, gives an emulsion for at least 10 seconds or even 20 seconds, and which once again undergoes rapid phase separation into two transparent phases, having a perfectly sharp interface and without the appearance of droplets which remain attached to the walls of the transparent container, by using a combination of an aqueous phase comprising at least one alkylpolyglucoside surfactant, and a diol including at least 5 carbon atoms, and an oily phase comprising at least 75% by weight, relative to the total weight of oily phase representing 100%, of at least one compound comprising from 15 to 30 carbon atoms and chosen from linear and/or branched alkanes, fatty alcohol ethers, fatty acid esters and/or fatty alcohol esters.

[0014] This combination of ingredients makes it possible to obtain better “working qualities” for the two-phase product according to the invention, namely: efficient makeup removal, including the removal of waterproof makeup, a controlled demixing time, suited to the makeup removal time, and a sharp interface without any foam between the two phases at rest. These qualities are all the more surprising since they are confirmed after several cycles of use of the two-phase product according to the invention, whereas degradation of the interface is generally observed gradually in the course of using the two-phase products of the prior art.

Summary of the invention

[0015] One subject of the present invention is thus a two-phase composition consisting of an aqueous phase and a nonsilicone oily phase which are separate and transparent, characterized in that:

- the aqueous phase comprises water, at least one alkylpolyglycoside surfactant and at least one diol including at least 5 carbon atoms, and

- the oily phase comprises at least 75% by weight, relative to the total weight of oily phase representing 100%, of at least one compound comprising from 15 to 30 carbon atoms and chosen from linear and/or branched alkanes, fatty alcohol ethers, fatty acid esters and/or fatty alcohol esters, and mixtures thereof.

[0016] Advantageously, said alkylpolyglycoside surfactant is chosen from alkylpolysaccharides or alkylmonosaccharides, which are preferably non-ethoxylated; preferably, said surfactant is chosen from non-ethoxylated alkylpolyglucosides, preferably alkylpolyglucosides in which the alkyl chain comprises at least 10 carbon atoms, preferably from 10 to 16 atoms; preferably, said at least one surfactant comprises, or even is, decyl glucoside. Preferably, said at least one alkylpolyglycoside surfactant represents from 0.004% to 0.5% by weight, preferably from 0.005% to 0.2%, preferably from 0.006% to 0.2%, preferably from 0.007% to 0.1%, preferably from 0.008% to 0.09% by weight, preferably from 0.009% to 0.08% by weight, preferably from 0.01% to 0.07%, preferably between 0.01% and 0.05% by weight of active material relative to the total weight of the composition.

[0017] Advantageously, said diol is of C5-C10; preferably, said diol is chosen from pentylene glycol (or 1,2-pentanediol), hexylene glycol, 1,2-hexanediol, 1,6-hexanediol, caprylyl glycol (or 1,2-octanediol) and mixtures thereof; preferably, said at least one diol comprises, or even is, pentylene glycol. Preferably, said at least one diol represents a weight content of from 1% to 10%, preferably from 1% to 5%, preferably from 1% to 4%, preferably from 1% to 3%, preferably from 1.5% to 2.5%, by weight of active material relative to the total weight of the composition.

[0018] Advantageously, the compound(s) comprising from 15 to 30 carbon atoms in the oily phase represent more than 75%, preferably more than 80%, preferably more than 85%, preferably more than 90%, preferably more than 95%, by weight relative to the total weight of the oily phase. Advantageously, said at least one compound of the oily phase is chosen from linear and/or branched C15-28 alkanes and mixtures of alkanes, and/or fatty alcohol ethers and/or fatty acid esters and/or fatty alcohol esters including from 16 to 24 carbon atoms, and mixtures thereof; preferably, said compound is chosen from linear and/or branched C15-C28, preferably C15-C19, alkanes and mixtures of alkanes. Preferably, any alkane present in the oily phase comprises more than 14 carbon atoms, preferably more than 15 carbon atoms, preferably more than 16 carbon atoms. Preferably, said at least one compound comprising from 15 to 30 carbon atoms, preferably alkane, represents at least 5% by weight, preferably from 5% to 45% by weight, preferably from 5% to 30%, preferably from 10% to 25%, preferably from 12% to 20% by weight, relative to the total weight of the two-phase composition representing 100%.

[0019] Advantageously, the aqueous phase/oily phase weight ratio of the two-phase composition according to the invention is within the range from 95/5 to 55/45, preferably from 95/5 to 65/35, preferably from 90/10 to 70/30, preferably from 90/10 to 80/20. The composition according to the invention advantageously contains less than 1%, preferably less than 0.5%, preferably less than 0.2%, preferably less than 0.1% by weight of silicone oil relative to the total weight of the composition, and ideally the two-phase composition of the invention is free of any silicone oil.

[0020] Advantageously, the oily phase also comprises at least one plant oil, which is preferably an organic oil, preferably in a content ranging from 0.01% to 10%, preferably from 0.1% to 7%, preferably from 0.2% to 5%, preferably from 0.3% to 3%, preferably from 0.4% to 2% relative to the total weight of the two-phase composition. The plant oil is preferably chosen from apricot oil, sweet almond oil, argan oil, arnica oil (macerate), sunflower oil, avocado oil, bay laurel berry oil, baobab oil, jojoba oil, neem oil, nigella oil, castor oil, broccoli oil, beauty-leaf oil, tamanu oil, camellia oil, safflower oil, coconut oil, coconut kernel oil, evening primrose oil, organic beauty-leaf oil, barbary fig oil, macadamia oil, moringa oil, hazelnut oil, grapefruit pip oil, perilla oil, grapeseed oil, rocket oil, sesame oil, sunflower oil, dhatelo oil, dog rose oil, musk rose oil, acai oil, sea buckthorn oil, walnut oil, tiger nut oil, carrot oil, barbary fig oil, bearberry oil, black cumin oil, marrow seed oil, evening primrose oil, buriti oil, wheat germ oil, pomegranate oil, babassu oil, milk thistle oil, oily extract of tepescohuite, amaranthus oil, passionfruit oil, rice bran oil, raspberry oil, poppy oil, karanja oil, candlenut oil, cranberry seed oil, chia oil, hemp oil, cotton oil, groundnut oil, oat oil, organic dog rose oil, Inca inchi oil, blackcurrant oil, rapeseed oil, cucumber oil, coconut kernel oil, marrow oil, cranberry oil, fenugreek oil, mustard seed oil, maritime pine oil, organic pomegranate oil, mango oil and soybean oil.

[0021] A subject of the present invention is also the use of at least one plant oil, which is preferably organic, preferably as mentioned above, in a two-phase composition according to the invention, for, after shaking said composition, slowing down the rate of demixing of the two phases of the composition, and/or improving the sharpness of the interface between the two phases and/or prolonging the sharpness of the interface at rest of the two-phase product after at least three cycles of use of the two-phase product, characterized in that the content of plant oil is within the range from 0.01% to 10%, preferably from 0.1% to 7%, preferably from 0.2% to 5%, preferably from 0.3% to 3%, preferably from 0.4% to 2%, relative to the total weight of the two-phase composition.

[0022] A subject of the present invention is also a cosmetic process for removing makeup from, cleansing and/or caring for the skin, the lips and/or the eyes, the body or the hair, characterized in that a cosmetic composition according to the invention as detailed in the present description is applied to the skin, the lips and/or the eyes, or the hair.

Detailed description

[0023] The (two-phase) composition of the invention is effective for removing waterproof makeup, without leaving greasy residues on the skin, and has better working qualities in terms of demixing time (sufficient for removing makeup) and of demixing quality (sharp interface and clear phases), confirmed after several cycles of use of the two-phase product according to the invention. [0024] Since the composition of the invention is intended for topical application, it contains a physiologically acceptable medium, i.e. a medium that is compatible with the skin, mucous membranes, the hair and the scalp.

[0025] The composition according to the invention comprises at least one aqueous phase and one oily phase that are separate. These two phases are separate, i.e. they are visible one on top of the other at rest, and the interface between the two is perfectly sharp. They are transparent at rest, and when the composition is shaken before use, the mixture obtained consists of the emulsion of one phase in the other. The two phases may or may not be colored.

[0026] For the purposes of the present invention and unless otherwise indicated:

[0027] The expression “at least one” is equivalent to “one or more” and, unless otherwise indicated (such as “more than...” or “between X and Y”), the limits of a range of values are included in that range (for example “in the range from X to Y”).

[0028] The word “transparent” means that the phase has a turbidity of less than or equal to 300 NTU. The transparency of a composition may be measured by its turbidity, and the NTU (nephelometric turbidity units) are the units for measuring the turbidity of a composition. The turbidity measurement may be performed, for example, with a 21 OOP model turbidimeter from the Hach Company, the tubes used for the measurement being referenced AR397A cat 24347-06. The measurements are performed at room temperature (20°C to 25°C). The two separate phases of the composition in accordance with the invention have a turbidity generally ranging from 0.1 to 300 NTU and preferably from 1 to 100 NTU.

[0029] Preferably, the weight ratio between the aqueous phase and the oily phase ranges from 95/5 to 5/95, preferably from 95/5 to 40/60 and better still from 95/5 to 50/50.

[0030] Advantageously, the aqueous phase/oily phase weight ratio of the two-phase product according to the invention is within the range from 95/5 to 55/45, preferably within the range from 95/5 to 65/35, preferably from 90/10 to 70/30, preferably from 90/10 to 80/20.

[0031] Aqueous phase

[0032] The aqueous phase thus generally represents from 5% to 95% by weight, preferably from 40% to 95% by weight and better still from 50% to 95% by weight relative to the total weight of the composition. [0033] Advantageously, the aqueous phase of the two-phase product according to the invention represents a weight content within the range from 55% to 95%, preferably from 65% to 95%, preferably from 70% to 90%, preferably from 80% to 90%, preferably from 82% to 88% by weight relative to the total weight of the composition.

[0034] The aqueous phase (also known as the hydrophilic phase) of the composition according to the invention advantageously comprises water, and preferably at least 50%, preferably at least 60%, or even at least 65%, or better still at least 70%, by weight of water relative to the total weight of the composition.

[0035] The water used may be sterile demineralized water and/or a floral water such as rose water, cornflower water, camomile water or lime blossom water, and/or a natural spring water or mineral water, for instance: Vittel water, Vichy basin water, Uriage water, Roche Posay water, Bourboule water, Enghien-les-Bains water, Saint Gervais-les-Bains water, Neris-les-Bains water, Allevar-les-Bains water, Digne water, Maizieres water, Neyrac-les- Bains water, Lons-le-Saunier water, Eaux Bonnes water, Rochefort water, Saint Christau water, Fumades water, Tercis-les-bains water and Avene water. The aqueous phase may also comprise reconstituted spring water, i.e. a water containing trace elements such as zinc, copper, magnesium, etc., reconstituting the characteristics of a spring water.

[0036] Diol

[0037] The aqueous phase of the composition of the invention also comprises at least one diol including at least 5 carbon atoms, preferably from 5 to 10 carbon atoms, preferably from 5 to 8 carbon atoms, even more preferably from 5 to 6 carbon atoms, or even better still 5 carbon atoms.

[0038] Said diol including at least 5 carbon atoms according to the invention is advantageously chosen from pentylene glycol (or 1,2-pentanediol), hexylene glycol, 1,2- hexanediol, 1,6-hexanediol, caprylyl glycol (or 1 ,2-octanediol) and mixtures thereof; preferably, said diol is pentylene glycol.

[0039] Said at least one diol containing at least 5 carbon atoms represents a weight content of from 1% to 10%, preferably from 1% to 5%, preferably from 1% to 4%, preferably from 1% to 3%, preferably from 1.5% to 2.5%, by weight of active material relative to the total weight of the composition.

[0040] The aqueous phase of the composition of the invention may also contain any water- soluble or water-dispersible additive.

[0041] Advantageously, the composition does not comprise any polyol other than the diol defined above. In particular, the composition according to the invention comprises less than 5%, preferably less than 3%, preferably less than 2%, relative to the total weight of the composition, of possible polyol(s) other than said diol comprising at least 5 carbon atoms defined according to the invention. The term “polyol” should be understood as meaning any organic molecule including at least two free hydroxyl groups. As other polyols (different from the diol defined according to the invention), mention may be made, for example, of glycerol, glycols, for instance butylene glycol, propylene glycol, methylpropanediol, 1,3-propanediol, isoprene glycol, dipropylene glycol, and polyethylene glycols, sorbitol, sugars such as glucose, and mixtures thereof.

[0042] Advantageously, the composition according to the invention does not comprise any monoalcohol, i.e. any alcohol including from 1 to 6 carbon atoms in which only one hydroxyl group is bonded to one of the carbon atoms, such as ethanol and isopropanol.

[0043]Alternatively, if such an alcohol is present, it is present in an amount ranging from 0.01% to 10%, preferably from 0.01% to 5% by weight, preferably from 0.1% to 2%, preferably from 0.1% to 1% by weight relative to the total weight of the composition. The addition of such an alcohol is rather suitable when the composition according to the invention is used as a product for the body or the hair.

[0044] Alkylpolyglycoside

[0045] The composition according to the invention comprises at least one alkylpolyglycoside surfactant, said surfactant forming part of the aqueous phase of the two-phase product, notably before shaking.

[0046] For the purposes of the present invention, the term “alkylpolyglycoside” means an alkylmonosaccharide (degree of polymerization 1) or an alkylpolysaccharide (degree of polymerization greater than 1).

[0047] The alkylpolyglycosides may be used alone or in the form of mixtures of several alkylpolyglycosides. They generally correspond to the structure R(0)(G)x in which the radical R is a linear or branched C6-C30, preferably C8-C22 and preferably C8-C18 alkyl radical, G is a saccharide residue and x ranges from 1 to 5, preferably from 1 to 2.5 and more preferentially from 1 to 2.

[0048] The saccharide residue may be chosen from glucose, dextrose, saccharose, fructose, galactose, maltose, maltotriose, lactose, cellobiose, mannose, ribose, dextran, talose, allose, xylose, levoglucan, cellulose and starch. More preferentially, the saccharide residue denotes glucose. [0049] It should also be noted that each unit of the polysaccharide part of the alkylpolyglycoside may be in a or b isomer form, in L or D form, and the configuration of the saccharide residue may be of furanoside or pyranoside type.

[0050] It is, of course, possible to use mixtures of alkylpolysaccharides, which may differ from each other in the nature of the borne alkyl unit and/or the nature of the bearing polysaccharide chain.

[0051] In particular, mention may be made of alkylpolyglucosides containing an alkyl group including from 6 to 30 carbon atoms and preferably from 8 to 16 carbon atoms and containing a glucoside group preferably comprising from 1.2 to 3 saccharide units. Mention may be made, for example, of decyl glucoside, such as C9/C11 -alkyl polyglucoside (1,4) as an aqueous 40% solution, for instance the product sold under the name Mydol 10® by the company Kao Chemicals, the 85/10/5 C 10/C 12/C 14-alkyl polyglucoside (1,4) as an aqueous 55% solution, for instance the product sold under the name Oramix NS 10® by the company SEPPIC; and caprylyl/capryl glucoside such as 50/50 C8/C10-alkyl polyglucoside (2) as an aqueous 60% solution, for instance the product sold under the name Oramix CG 110® by the company SEPPIC.

[0052] Advantageously, said alkylpolyglycoside surfactant is chosen from alkylpolysaccharides and alkylmonosaccharides, which are preferably non-ethoxylated. Preferably, said surfactant is chosen from non-ethoxylated alkylpolyglucosides, preferably chosen from decyl glucoside and/or caprylyl/capryl glucoside; preferably, said surfactant comprises decyl glucoside.

[0053] Such a surfactant simultaneously allows demixing suited to the two-phase product of the invention, good makeup-removing efficiency, and has the additional advantage of being of natural origin, and of renewable and readily biodegradable starting materials.

[0054] Advantageously, said at least one alkylpolyglycoside of the two-phase composition of the invention comprises, and preferably is, an alkylpolyglycoside whose alkyl chain comprises at least 10 carbon atoms, preferably from 10 to 16 atoms. The critical micelle concentration (CMC) of the long-chain alkylpolyglycosides (at least 10 carbon atoms) that are preferred according to the invention is relatively less than that of the other alkylpolyglycosides that are less preferred according to the invention. This low CMC which characterizes the preferred surfactant according to the invention also makes it possible to use a surfactant content that is as low as possible in the two-phase product according to the invention. Above their CMC in the aqueous phase, said alkylglycosides have very low interface tensions with respect to the oily phase according to the invention while at the same time allowing optimum phase separation for the two-phase product. This use of long-chain alkylpolyglycosides according to the invention contributes toward improving the makeup-removing efficiency of the two-phase product, notably by means of the presence of micelles, and the better compromise of emulsion/phase separation cycles obtained with the two-phase composition according to the invention.

[0055]Advantageously, said at least one alkylpolyglycoside surfactant represents from 0.004% to 0.5% by weight, preferably from 0.005% to 0.2%, preferably from 0.006% to 0.2%, preferably from 0.007% to 0.1%, preferably from 0.008% to 0.09% by weight, preferably from 0.009% to 0.08% by weight, preferably from 0.01% to 0.07%, preferably between 0.01% and 0.05% by weight of active material relative to the total weight of the composition.

[0056] At and above a content of 0.004% by weight of alkylpolyglycoside surfactant active material, the composition according to the invention shows acceptable demixing, which is both rapid and following a sufficient time to allow the application of a homogeneous fluid to cotton wool, whereas a content of less than 0.004% of surfactant in the composition has a tendency to produce a heterogeneous fluid on cotton wool, the demixing between the two phases being too rapid.

[0057] Furthermore, at and above a content of at least 0.01%, by weight of alkylpolyglycoside surfactant active material, the two-phase composition of the present invention is advantageously micellar.

[0058] Oily phase

[0059] The oily phase is also known as the “lipophilic phase” or the “liquid fatty phase”.

[0060] In the present patent application, the term “oils” refers to compounds and/or mixtures of compounds which are water-insoluble, and which have a liquid appearance at a temperature of 25°C.

[0061] The oily phase generally represents from 5% to 95% by weight, preferably from 5% to 60% by weight and better still from 5% to 50% by weight relative to the total weight of the composition.

[0062] The oily phase preferably represents from 5% to 45%, preferably from 5% to 35%, preferably from 10% to 30%, preferably from 10% to 20% by weight, relative to the total weight of the composition.

[0063] The oily phase of the composition according to the invention preferably comprises one or more apolar or sparingly polar oils having a polarity parameter 5_a of less than 7.0 J/cm³)^1/2. [0064] In particular, the oily phase of the composition according to the invention is characterized in that it comprises at least 75% by weight, relative to the total weight of oily phase representing 100%, of at least one compound comprising from 15 to 30 carbon atoms and chosen from linear and/or branched alkanes, fatty alcohol ethers, fatty acid esters and/or fatty alcohol esters, and mixtures thereof, including mixtures of alkanes, mixtures of ethers, or mixtures of esters, and mixtures of two or more of these different types of compounds.

[0065] Advantageously, said compound comprising from 15 to 30 carbon atoms is equally chosen from linear or branched alkanes that are purely hydrocarbon-based, and from fatty alcohol ethers and/or fatty acid esters and/or fatty alcohol esters containing at least one linear or branched hydrocarbon-based fatty chain, provided that said alkane, ether or ester has a total number of carbons in the molecule that is within the range from 15 to 30.

[0066] For the purposes of the invention, the term “Cx-Cy” or “CX-CY” compound, where x and y respectively represent a number, means compounds in which the total number of carbon atoms is within the range from x to y (except in the case where it is expressly mentioned that it is an alkyl chain which is of Cx-Cy, in which case it is the number of carbons of said chain).

[0067] For the purposes of the invention, the term “alkanes” means compounds comprising at least one saturated hydrocarbon-based chain consisting of carbon (C) and hydrogen (H) atoms, bonded together via single bonds, said at least one hydrocarbon-based chain of these compounds possibly comprising one or more branches.

[0068] Advantageously, each alkane present in the oily phase of the composition according to the invention comprises more than 14 carbon atoms, preferably more than 15 carbon atoms, or even more than 16 carbon atoms.

[0069] Advantageously, said at least one compound of the oily phase is chosen from:

[0070] - linear or branched C15-30 alkanes, notably chosen from mixtures of alkanes containing from 15 to 19 carbon atoms, notably mixtures of cyclic or acyclic, linear or branched hydrocarbons including from 15 to 19 carbon atoms, or mixtures of alkanes containing from 18 to 21 carbon atoms, such as mixtures of cyclic or acyclic, linear or branched hydrocarbons including from 18 to 21 carbon atoms, or those containing from 21 to 28 carbon atoms, notably mixtures of cyclic or acyclic, linear or branched hydrocarbons including from 21 to 28 carbon atoms, and, among these, preferably those of plant origin, mixtures of C15 to C19 alkanes (containing from 15 to 19 carbon atoms) being most particularly preferred; and/or [0071] - fatty alcohol ethers and/or fatty acid esters and/or fatty alcohol esters, said ethers or esters including in total from 15 to 30 carbon atoms, preferably from 15 to 28, preferably from 16 to 24 carbon atoms; preferably comprising at least one saturated, linear or branched hydrocarbon-based fatty chain, including from 8 to 30 carbon atoms, preferably from 8 to 28, preferably from 15 to 28, preferably from 16 to 24, preferably from 18 to 24 carbon atoms;

[0072] and mixtures thereof.

[0073] The C15-28 alkanes are most particularly preferred, said compound compound of the oily phase being chosen from: mixtures of alkanes containing from 15 to 19 carbon atoms, or mixtures of alkanes containing from 18 to 21 carbon atoms, or those containing from 21 to 28 carbon atoms, and, among these, preferably those of plant origin.

[0074] These mixtures of alkanes are preferably obtained from the implementation of preparation processes as described in patent applications WO 2011/061612 and WO 2011/061716.

[0075] Advantageously, said at least one compound used in the composition according to the invention, preferably chosen from alkanes and mixtures of alkanes, preferably of C15- 28, is obtained from starting materials of plant origin, notably from palm, preferably in accordance with the Cosmos standard.

[0076] Such mixtures of alkanes are notably sold, respectively, under the names Emosmart® of grades L19, V21 and C28, or Emogreen® of grades L15 or L19, by SEPPIC. For a composition according to the invention, the grade Emogreen® L19 is most particularly preferred.

[0077] Advantageously, said at least one compound comprising from 15 to 30 carbon atoms of the oily phase comprises a mixture of cyclic or acyclic, linear or branched hydrocarbons including from 15 to 19 carbon atoms.

[0078] Among the fatty alcohol ethers and/or fatty acid esters and/or fatty alcohol esters, the ones that are intended are the oils of formulae R1COOR2 and R10R2 in which R1 represents a fatty acid residue including from 8 to 36 carbon atoms, in the form of a saturated, linear or branched hydrocarbon-based fatty chain including from 8 to 36 carbon atoms, and R2 represents a branched or non-branched hydrocarbon-based chain containing from 8 to 36 carbon atoms.

[0079] The esters of C14-C36, preferably C15-C32, preferably C15-C30, preferably C16-C28, preferably C16-C24 fatty alcohols and/or fatty acids are advantageously chosen from ethylhexyl palmitate, isopropyl palmitate, ethyl myristate, myristyl myristate, butyl stearate, ethylhexyl stearate, octyldodecyl stearate, stearyl heptanoate and stearyl caprylate.

[0080] The fatty unit of the ethers is advantageously chosen from caprylyl, cetyl, behenyl, arachidyl, stearyl, palmityl, myristyl, lauryl and hexadecanoyl units, and mixtures thereof such as cetearyl. The fatty alcohol ether is advantageously dicaprylyl ether.

[0081] Preferably, the C15-C30 compound(s) in the oily phase represent more than 75%, preferably more than 85%, preferably more than 95%, or even more than 98%, by weight relative to the total weight of the oily phase.

[0082] Advantageously, said at least one C15-C30 compound represents at least 5% by weight, preferably from 5% to 45% by weight, preferably from 5% to 30%, preferably from 10% to 25%, preferably from 12% to 20% by weight, relative to the total weight of the two-phase composition representing 100%.

[0083] According to one embodiment of the invention, the composition comprises at least one additional nonsilicone oil chosen from the following nonsilicone, apolar or sparingly polar oils, other than said at least one C15-C30 alkane defined above.

[0084] Apolar or sparingly polar oils

[0085] For the purposes of the invention, the term “apolar or sparingly polar oil” means an oil with a polarity parameter 5_a of less than 7.0 (J/cm³)^1/2.

[0086] For the purposes of the invention, the term “polarity parameter” means the mean parameter 5_a reflecting the polarity of a molecule: the higher the value of 5_a, the higher the polarity of the molecule.

[0087] The mean parameter 5_a is defined as a function of the Hansen solubility parameters d_r and 5h, according to the relationship 5_a = (d_r ² + 6h²)^{1 /2}.

[0088] The parameters d_r and 6_h characterize, respectively, the Debye interaction forces between permanent dipoles and the capacity of a compound to give hydrogen bonds. These parameters are defined according to the Hansen solubility parameter space in the document J. Paint Technology 39, 195 (1967) “The Three-Dimensional Solubility Parameter - Key to Paint Component Affinities”.

[0089] The other apolar oils according to the invention are in particular volatile or nonvolatile hydrocarbons which are notably branched and/or unsaturated of synthetic or mineral origin, such as liquid paraffins, which are volatile (isoparaffins or isododecane) or nonvolatile, and derivatives thereof, petroleum jelly, liquid lanolin, polydecenes, hydrogenated polyisobutene such as Parleam (from Nippon Gel Fats), squalane; fluorinated and notably perfluorinated oils; and mixtures thereof, fatty alcohols that are liquid at room temperature, containing from 8 to 26 carbon atoms, for instance octyldodecanol, 2-butyloctanol, 2- hexyldecanol, 2-undecylpentadecanol or oleyl alcohol, and volatile linear alkanes comprising from 7 to 14 carbon atoms such as undecane and tridecane. Among the volatile linear alkanes comprising from 7 to 14 carbon atoms, in particular from 9 to 13 carbon atoms and more particularly from 11 to 13 carbon atoms, mention may be made of alkanes such as those described in the patent applications WO 2007/068371 or WO 2008/155059 from the company Cognis (mixtures of different alkanes differing by at least one carbon). These alkanes are obtained from fatty alcohols, which are themselves obtained from coconut kernel oil or palm oil.

[0090] As examples of linear alkanes other than the C15-C30 alkanes defined according to the invention or of alkanes that are less preferred for the composition according to the invention, mention may notably be made of n-heptane (C7), n-octane (C8), n-nonane (C9), n-decane (C10), n-undecane (C11) and optionally n-dodecane (C12), n-tridecane (C13) and n-tetradecane (C14), and mixtures thereof.

[0091] According to a preferred embodiment of the invention, the composition does not comprise any alkane other than the C15-C30 alkane defined according to the invention.

[0092] According to a preferred embodiment of the invention, the composition does not comprise any alkane other than at least one alkane comprising at least 15 carbon atoms. In other words, according to this last preferred embodiment of the invention, all the alkanes in the composition of the invention comprise at least 15 carbon atoms.

[0093] According to yet another particularly advantageous embodiment of the invention, the composition does not comprise any additional nonsilicone oil. In this embodiment, the composition comprises only oils chosen from C15-C30 alkanes, preferably including from 15 to 28 carbon atoms, preferably from 15 to 19 carbon atoms, alone or as a mixture.

[0094] These last two embodiments make it possible to reduce even more efficiently the risk of foaming at the interface between the two phases after shaking and then returning the two-phase product to rest.

[0095] Plant oils

[0096] According to an advantageous embodiment of the invention, the oily phase also comprises at least one plant oil, which is preferably an organic oil, preferably in a content ranging from 0.01% to 10%, preferably from 0.1% to 7%, preferably from 0.2% to 5%, preferably from 0.3% to 3%, preferably from 0.4% to 2% relative to the total weight of the two-phase composition. [0097] The plant oil is advantageously chosen from apricot oil, sweet almond oil, argan oil, arnica oil (macerate), sunflower oil, avocado oil, bay laurel berry oil, baobab oil, jojoba oil, neem oil, nigella oil, castor oil, broccoli oil, beauty-leaf oil, tamanu oil, camellia oil, safflower oil, coconut oil, coconut kernel oil, evening primrose oil, organic beauty-leaf oil, barbary fig oil, macadamia oil, moringa oil, hazelnut oil, grapefruit pip oil, perilla oil, grapeseed oil, rocket oil, sesame oil, sunflower oil, dhatelo oil, dog rose oil, musk rose oil, acai oil, sea buckthorn oil, walnut oil, tiger nut oil, carrot oil, barbary fig oil, bearberry oil, black cumin oil, marrow seed oil, evening primrose oil, buriti oil, wheat germ oil, pomegranate oil, babassu oil, milk thistle oil, oily extract of tepescohuite, amaranthus oil, passionfruit oil, rice bran oil, raspberry oil, poppy oil, karanja oil, candlenut oil, cranberry seed oil, chia oil, hemp oil, cotton oil, groundnut oil, oat oil, organic dog rose oil, Inca inchi oil, blackcurrant oil, rapeseed oil, cucumber oil, coconut kernel oil, marrow oil, cranberry oil, fenugreek oil, mustard seed oil, maritime pine oil, organic pomegranate oil, mango oil and soybean oil.

[0098] In this embodiment, the addition of a certain content of plant oil according to the invention makes it possible to better control the rate of demixing, and in particular to slow down by a few seconds to a few tens of seconds the moment at which the interface reappears between the two phases of the two-phase product at rest.

[0099] One subject of the present invention is thus also the use of plant oil as defined above in a two-phase composition according to the invention, for, after shaking said composition, slowing down the rate of demixing of the two phases of the composition.

[0100] Furthermore, the use of plant oil as defined above in a two-phase composition according to the invention makes it possible to further improve the sharpness of the interface between the two phases and/or to prolong the sharpness of the interface of the two-phase product at rest even after several cycles (at least three cycles) of use of the two-phase product.

[0101] A subject of the present invention is thus also the use of at least one plant oil chosen from those defined or listed above, in a two-phase composition according to the invention, for, after shaking said composition, slowing down the rate of demixing of the two phases of the composition, and/or improving the sharpness of the interface between the two phases and/or prolonging the sharpness of the interface of the two-phase product at rest even after several cycles (at least three cycles) of use of the two-phase product, characterized in that the content of plant oil is within the range from 0.01% to 10%, preferably from 0.1% to 7%, preferably from 0.2% to 5%, preferably from 0.3% to 3%, preferably from 0.4% to 2%, relative to the total weight of the two-phase composition.

[0102] Silicone oils [0103] Advantageously, the composition according to the invention contains less than 1%, preferably less than 0.5%, preferably less than 0.2%, preferably less than 0.1% by weight of silicone oil relative to the total weight of the composition, and ideally the two-phase composition of the invention is free of any silicone oil.

[0104] Among these silicone oils, examples that may be mentioned include volatile silicone oils such as cyclopolydimethylsiloxanes (I NCI name: cyclomethicone), such as cyclopentasiloxane, cyclohexasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane; linear silicones such as heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane or dodecamethylpentasiloxane; nonvolatile silicone oils such as polymethylsiloxanes, notably PDMS, and phenyl polymethylsiloxanes such as phenyl trimethicones, phenyl dimethicones, phenyltrimethylsiloxydiphenylsiloxanes, diphenyl dimethicones, diphenylmethyldiphenyltrisiloxanes, 2-phenylethyl trimethyl siloxysilicates and polymethylphenylsiloxanes; polysiloxanes modified with fatty acids, fatty alcohols or polyoxyalkylenes, and mixtures thereof.

[0105] Additional surfactants

[0106] Preferably, the composition of the invention does not comprise any surfactant other than said at least one alkylpolyglycoside surfactant defined above.

[0107] According to a particular embodiment, the composition according to the invention may optionally comprise at least one additional surfactant other than the surfactants as defined previously in one or other of the phases. When it contains an additional surfactant, it may be of the anionic, nonionic or amphoteric type, but it is preferably of the nonionic and/or anionic type. It is preferably present in the hydrophilic phase.

[0108] The total amount of surfactant(s) as active material in the composition must be in an amount such that the two phases remain separate at rest and do not mix to form an emulsion. This total amount must generally be less than or equal to 1.5% by weight relative to the total weight of the composition. It may range, for example, from 0.01% to 1.5% by weight, preferably from 0.025% to 1% by weight and better still from 0.05% to 0.5% by weight relative to the total weight of the composition.

[0109] According to a preferred embodiment, the composition according to the invention comprises less than 0.5% by weight of additional surfactants relative to the total weight of the composition, preferably less than 0.2%, preferably less than 0.1% by weight of additional surfactant active material, relative to the total weight of the composition, and better still the composition of the invention is free of additional surfactants. [0110] Among the additional nonionic surfactants, the ones that are particularly preferred are: polyoxyethylenated fatty esters of sorbitol such as the product sold under the name Tween 20 by the company ICI; polyoxyethylenated fatty alcohols such as the product sold under the name Remcopal 21912 AL by the company Gerland; polyoxyethylenated alkylphenols such as the product sold under the name Triton X 100 by the company Rohm & Haas; condensates of ethylene oxide and of propylene oxide such as those sold under the names Synperonic PE by the company ICI and in particular those referenced L 31 , L 64, F 38, F 88, L92, P 103, F 108 and F 127; fatty acid esters of glycerol or of polyglycerol, for instance glyceryl isostearate, polyglyceryl-3 diisostearate, glyceryl caprylate; ethers of polyethylene glycol and/or of polypropylene glycol, and of glycerol, such as glycereth-7, glycereth-26, PPG-24 glycereth-24; esters obtained from the reaction a) of fatty acids and b) polyethylene glycol and/or polypropylene glycol glycerol ethers, for instance glycereth-2 cocoate, glycereth-25 PCA isostearate; fatty acid esters of sucrose other than those defined previously, comprising from 12 to 30 carbon atoms, in particular 14 to 20 carbon atoms, said esters possibly comprising from 2 to 5 fatty chains, for instance sucrose distearate, sucrose tristearate; polymeric emulsifiers such as hydrophobic-modified inulins, for example Inutec SP1 sold by the company Beneo Bio-Based Chemicals.

[0111] Among the anionic polysiloxanes, mention may notably be made of:

[0112] - alkyl sulfates, alkyl ether sulfates and salts thereof, notably the sodium salts thereof, for instance the mixture of sodium laureth sulfate/magnesium laureth sulfate/sodium laureth-8 sulfate/magnesium laureth-8 sulfate, sold under the name Texapon ASV by the company Henkel; sodium lauryl ether sulfate (70/30 C12-14) (2.2 OE) sold under the names Sipon AOS 225 or Texapon N702 Pate by the company Henkel, ammonium lauryl ether sulfate (70/30 C 12-14) (3 OE) sold under the name Sipon LEA 370 by the company Henkel; the ammonium (C12-C14) alkyl ether (9 OE) sulfate sold under the name Rhodapex AB/20 by the company Rhodia Chimie;

[0113] - alkyl sulfoacetates such as the product sold under the name Lathanol LAL by the company Stepan;

[0114] - alkyl sulfosuccinates, for instance the oxyethylenated (3 OE) lauryl alcohol monosulfosuccinate (70/30 C12/C14) sold under the names Setacin 103 Special and Rewopol SB-FA 30 K 4 by the company Witco, the disodium salt of a hemisulfosuccinate of C12-C14 alcohols, sold under the name Setacin F Special Paste® by the company Zschimmer Schwarz, the oxyethylenated (2 OE) disodium oleamidosulfosuccinate sold under the name Standapol SH 135 by the company Henkel, the oxyethylenated (5 OE) laurylamide monosulfosuccinate sold under the name Lebon A-5000 by the company Sanyo, the oxyethylenated (10 OE) disodium salt of lauryl citrate monosulfosuccinate sold under the name Rewopol SB CS 50 by the company Witco, and the disodium salt of ricinoleic monoethanolamide monosulfosuccinate sold under the name Rewoderm S 1333 by the company Witco;

[0115] - polypeptides which are obtained, for example, by condensation of a fatty chain with amino acids from cereals and notably from wheat and oat, for instance the potassium salt of hydrolyzed lauroyl wheat protein, sold under the name Aminofoam W OR by the company Croda, the triethanolamine salt of hydrolyzed cocoyl soybean protein, sold under the name May-Tein SY by the company Maybrook, the sodium salt of lauroyl oat amino acids, sold under the name Proteol Oat by the company SEPPIC, collagen hydrolyzate grafted onto coconut fatty acid, sold under the name Geliderm 3000 by the company Deutsche Gelatine, and soybean proteins acylated with hydrogenated coconut acids, sold under the name Proteol VS 22 by the company SEPPIC;

[0116] - amino acid derivatives, for example sarcosinates and notably acylsarcosinates, for instance sodium lauroylsarcosinate, sold under the name Sarkosyl NL 97 by the company Ciba or sold under the name Oramix L 30 by the company SEPPIC, sodium myristoyl sarcosinate, sold under the name Nikkol Sarcosinate MN by the company Nikkol, or sodium palmitoyl sarcosinate, sold under the name Nikkol Sarcosinate PN by the company Nikkol; alaninates, such as sodium N-lauroyl-N-methylamidopropionate, sold under the name Sodium Nikkol Alaninate LN 30 by the company Nikkol or sold under the name Alanone Ale by the company Kawaken, and triethanolamine N-lauroyl-N-methylalanine, sold under the name Alanone Alta by the company Kawaken; N-acylglutamates such as the triethanolamine monococoylglutamate sold under the name Acylglutamate CT-12 by the company Ajinomoto, and the triethanolamine lauroyl glutamate sold under the name Acylglutamate LT-12 by the company Ajinomoto; aspartates, such as the mixture of triethanolamine N-lauroyl aspartate and triethanolamine N-myristoyl aspartate, sold under the name Asparack LM-TS2 by the company Mitsubishi; glycine derivatives, for instance sodium N-cocoyl glycinate and potassium N-cocoyl glycinate, such as the products sold under the names Amilite GCS-12 and Amilite GCK-12 by the company Ajinomoto;

[0117] - sulfonates, for example a-olefinsulfonates, such as the sodium a-olefinsulfonate (C14-C16), sold under the name Bio-Terge AS-40 by the company Stepan, sold under the names Witconate AOS Protege and Sulframine AOS PH 12 by the company Witco or sold under the name Bio-Terge AS-40 CG by the company Stepan, secondary sodium olefinsulfonate, sold under the name Hostapur SAS 30 by the company Clariant; linear alkylarylsulfonates, such as sodium xylenesulfonate, sold under the names Manrosol SXS30, Manrosol SXS40 and Manrosol SXS93 by the company Manro; [0118] - isethionates, notably acylisethionates, for instance sodium cocoyl isethionate, such as the product sold under the name Jordapon Cl P by the company Jordan.

[0119] Among the amphoteric or zwitterionic surfactants, mention may notably be made of:

[0120] - alkylamido alkylamine derivatives such as N-disodium N-cocoyl-N- carboxymethoxyethyl-N-carboxymethylethylenediamine (CTFA name: Disodium cocoamphodiacetate) sold as an aqueous saline solution under the name Miranol C2M Cone NP by the company Rhodia Chimie; N-sodium N-cocoyl-N-hydroxyethyl-N- carboxymethylethylenediamine (CTFA name: sodium cocamphoacetate) and the mixture of coconut acid ethanolamides (CTFA name: Cocamide DEA);

[0121] - betaines, for instance cocoyl betaine, such as the product sold under the name Dehyton AB-30 by the company Henkel, lauryl betaine, such as the product sold under the name Genagen KB by the company Clariant, oxyethylenated (10 OE) lauryl betaine, such as the product sold under the name Lauryl Ether (10 OE) Betaine by the company Shin Nihon Rica, or oxyethylenated (10 OE) stearyl betaine, such as the product sold under the name Stearyl Ether (10 OE) Betaine by the company Shin Nihon Rica;

[0122] - alkylamidopropyl betaines and derivatives thereof, for instance the cocamidopropyl betaine sold under the name Lebon 2000 HG by the company Sanyo or sold under the name Empigen BB by the company Albright & Wilson, or the lauramidopropyl betaine sold under the name Rewoteric AMB12P by the company Witco such as cocamidopropylbetaine, for instance the products sold under the name Tego Betaine by the company Goldschmidt;

[0123] - imidazoline derivatives such as the product sold under the name Chimexane HD by the company Chimex.

[0124] Adjuvants

[0125] The composition according to the invention may also contain conventional cosmetic adjuvants or additives which will be found in one or other phase according to their hydrophilic or lipophilic nature, for instance hydrophilic gelling agents, preserving agents and bactericides, colorants, softeners, buffers, humectants, UV-screening agents (or sunscreens), electrolytes such as sodium chloride or a pH modifier, for example citric acid or sodium hydroxide), and mixtures thereof.

[0126] Depending on the desired viscosity of the composition according to the invention, it is possible to incorporate therein one or more hydrophilic gelling agents. Examples of hydrophilic gelling agents that may be mentioned include modified or unmodified carboxyvinyl polymers, such as the products sold under the names Carbopol (INCI name: carbomer) by the company Noveon; polyacrylamides; homopolymers and copolymers of

2-acrylamido-2-methylpropanesulfonic acid, which are optionally crosslinked and/or neutralized, such as the poly(2-acrylamido-2-methylpropanesulfonic acid) sold by the company Clariant under the name Hostacerin AMPS (INCI name: ammonium polyacryldimethyltauramide); polysaccharide biopolymers, for instance xanthan gum, guar gum, alginates, and modified or unmodified celluloses; and mixtures thereof. When they are present, these gelling agents must be introduced in an amount such that they do not modify the properties of the composition according to the invention. Lipophilic gelling agents that may be mentioned include alkene copolymers, for instance block copolymers of “diblock”, “triblock” or “radial” type, of the polystyrene/polyisoprene or polystyrene/polybutadiene type, such as the products sold under the name Luvitol HSB® by the company BASF, of the polystyrene/copoly(ethylene-propylene) type, such as the products sold under the name Kraton® by the company Shell Chemical Co., or of the polystyrene/copoly(ethylene-butylene) type, and mixtures of triblock and radial (star) copolymers in isododecane, such as those sold by the company Penreco under the name Versagel®, for instance the mixture of butylene/ethylene/styrene triblock copolymer and of ethylene/propylene/styrene star copolymer in isododecane (Versagel M 5960).

[0127] The gelling agent may be present in an active material content ranging from 0.05% to 10% by weight and preferentially from 0.1% to 5% by weight relative to the total weight of the composition.

[0128] As preserving agents, use may be made of any preserving agent usually used in the fields under consideration, for instance parabens, phenoxyethanol, chlorhexidine gluconate, polyhexamethylene biguanide hydrochloride (CTFA name: Polyaminopropyl biguanide), or salicylic acid. According to a preferred embodiment of the invention, the composition contains salicylic acid, alone or as a mixture with other preserving agents.

[0129] As bactericide, use may be made, for example, of a glyceryl mono(C3-C9)alkyl or (C3- C9)alkenyl ether, the manufacture of which is described in the literature, in particular in E. Baer, H.O.L. Fischer - J. Biol. Chem. 140-397-1941. Among these glyceryl mono(C3- C9)alkyl or (C3-C9)alkenyl ethers, use is preferably made of 3-[(2-ethylhexyl)oxy]-1 ,2- propanediol, 3-[(heptyl)oxy]-1, 2-propanediol, 3-[(octyl)oxy]-1, 2-propanediol and

3-[(allyl)oxy]-1, 2-propanediol. A glyceryl mono(C3-C9)alkyl ether that is more particularly preferred according to the present invention is 3-[(2-ethylhexyl)oxy]-1, 2-propanediol, sold by the company Schulke & Mayr G.m.b.H. under the trade name Sensiva SC 50 (INCI name: Ethylhexyl glycerol). [0130] Among the softeners, mention may be made in particular of allantoin and bisabolol, planktons, and certain plant extracts, such as rose extracts and melilot extracts.

[0131] As electrolytes, mention may be made of monopotassium or dipotassium phosphate, sodium chloride, magnesium sulfate and disodium EDTA.

[0132] The amount of salt(s) may range, for example, from 0 to 5% by weight, preferably from 0.1% to 2% by weight and better still from 0.5% to 1% by weight relative to the total weight of the composition.

[0133] According to the invention, the composition may also preferably comprise in the hydrophilic phase a phase-separating agent in a proportion ranging, for example, from 0.025% to 5% by weight relative to the total weight of the composition.

[0134] As phase-separating agent, examples that may be mentioned include alkyldimethylbenzylammonium chlorides as described in EP-A-603080, and notably benzalkonium chloride, and mixtures containing same; alkoxylated alkylglucosides including a quaternary ammonium group and notably lauryl methyl gluceth-10 hydroxypropyldimonium chloride, as described in EP-A-847746; vinylpyrrolidone polymers and copolymers and notably the polyvinylpyrrolidone/hexadecene copolymer as described in WO-A-99/56704; and mixtures thereof.

[0135] When such an agent is present, the ratio between the surfactant and the phase- separating agent preferably ranges from 0.005/1 to 200/1 and better still from 0.01/1 to 120/1.

[0136] As active agents that may be used in the composition of the invention, examples that may be mentioned include enzymes (for example lactoperoxidase, lipase, protease, phospholipase or cellulases); flavonoids; moisturizers, such as protein hydrolyzates; sodium hyaluronate; antiinflammatory agents; procyannidol oligomers; vitamins such as vitamin A (retinol), vitamin E (tocopherol), vitamin C (ascorbic acid), vitamin B5 (panthenol), vitamin B3 (niacinamide), derivatives of these vitamins (notably esters) and mixtures thereof; urea; caffeine; depigmenting agents such as kojic acid, hydroquinone and caffeic acid; salicylic acid and derivatives thereof; a-hydroxy acids, such as lactic acid and glycolic acid and derivatives thereof; retinoids, such as carotenoids and vitamin A derivatives; hydrocortisone; melatonin; extracts of algae, of fungi, of plants, of yeasts or of bacteria; steroids; antibacterial active agents, such as 2,4,4’-trichloro-2’-hydroxydiphenyl ether (or triclosan), 3,4,4’-trichlorocarbanilide (or triclocarban) and the acids indicated above, and notably salicylic acid and derivatives thereof; tensioning agents; ceramides; essential oils; and mixtures thereof; and any active agent that is suitable for the final purpose of the composition. [0137] The compositions described above may be packaged, in a known manner, in a single compartment bottle. The user must then shake the bottle before pouring the content thereof onto cotton wool. The product may also be packaged in a bottle of “pump-bottle” type. According to a particular embodiment, it is a transparent container, generally made of polyethylene terephthalate (PET).

[0138] The composition according to the invention may be used for any topical application; it may notably constitute a cosmetic or dermatological composition. It may be used in particular for caring for, cleansing and/or removing makeup from the skin, the lips and/or the eyes, and also as a haircare composition. [0139] Thus, a subject of the invention is also the cosmetic use of a cosmetic composition as defined above, for caring for, removing makeup from and/or cleansing the skin, the lips and/or the eyes, and/or for haircare.

[0140] Finally, a subject of the present invention is also a cosmetic process for removing makeup from, cleansing and/or caring for the skin, the lips and/or the eyes, the body or the hair, characterized in that a two-phase cosmetic composition according to the invention as defined above is applied to the skin, the lips and/or the eyes, the body or the hair.

[0141] According to a preferred embodiment of the invention, the composition constitutes a composition for cleansing and/or removing makeup from the skin, the lips and/or the eyes.

[0142] The examples below of compositions according to the invention are given as illustrations without any limiting nature. The amounts therein are given as weight percentages of starting material, unless otherwise mentioned. The names of the compounds are given as the chemical names or the INCI names.

Example [0143] Comparison of different contents of alkylpolyglucoside surfactant in a two-phase product

[0144] The following compositions were prepared.

[0145] [Table 1]

[0146] Minimum content of decyl glucoside in the two-phase product to produce a homogeneous fluid on cotton wool after shaking the two phases of the two-phase product, and to obtain a micellar two-phase product [0147] [Table 2]

[0148] Characterization of the aqueous phases by DLS (dynamic light scattering) spectroscopic analysis:

[0149] Protocol: [0150] The samples of aqueous phase are prefiltered through 0.20 p Acrodisc PSF GxF filters before being analyzed to limit their polydispersity.

[0151] The measurements were taken at 20°C with a Zetasizer Nano ZSP particle size analyzer sold by Malvern. Its measuring range extends from 0.3 nm to 10 pm.

[0152] Concentrations which make it possible to observe the absence of objects (micelles) in the aqueous phase are sought. A measurement is considered as pertinent when the signal-to-noise ratio is sufficient: “Intercept” must be greater than 0.85. [0153] A peak is seen to appear at 10 nm for the sample containing 0.011% of decyl glucoside AM in the aqueous phase. This population of objects is not present at 0.00825% of surfactant AM in the aqueous phase. A peak of the order of 1 n is present in the SA-free aqueous phase. [0154] At and above 0.01% by weight of decyl glucoside active material in the aqueous phase

(i.e. at and above 0.009% by weight of active material in the two-phase product) the two- phase product is considered as “micellar”. This is visible by the additional peak which appears at 10 nm on DLS spectroscopic analysis, when the content of decyl glucoside has exceeded the critical micelle concentration in the formula. [0155] Comparison of different polyols in an aqueous phase of a micellar makeup-removing two-phase product:

[0156] [Table 3]

Ό157] The use, in the aqueous phase, of a diol comprising at least 5 carbon atoms, such as pentylene glycol, makes it possible to obtain an aqueous phase of clear appearance, unlike the other polyols tested such as glycerol or the diols comprising only 2, 3 or 4 carbon atoms. [0158] Comparison of different alkanes used as oily phase (15%) in the two-phase product:

[0159] [Table 4]

[0160] Comparison of the demixing of the aqueous/oily phases:

[0161] The visual appearance of the two phases, of their interface and of the walls is evaluated 24 hours after shaking and demixing, for different compositions of oily phases, different aqueous phase/oily phase ratios, in the presence/absence of additional plant oil (refined organic olive oil).

[0162] The composition of the aqueous phase used in the examples below is indicated in the table below.

[0163] [Table 5]

[0164] [Table 6]

Ό165] Conclusions 24h after shaking (D2 before shaking) [0166] [Table 7]

Ό167] Comparative test 19 (Cp. 19: comparative outside the invention) is prohibitive (slightly cloudy in the two phases). The other tests are acceptable (the two phases are clear and the interface is sharp) and are thus examples according to the invention.

[0168] An “attachment at the top of the wall” reflected by residual droplets above the two- phase product, is observed for tests 17, 18, 19 and 22 with the oily phase essentially being, respectively: Dicaprylyl Ether, Tridecane/Pentadecane and Ethylhexyl Palmitate.

[0169] There is no attachment observed at the top of the wall (above the two-phase product) in the case of the tests with C15-19 alkane as oily phase.

[0170] For an identical composition, an 80/20 aqueous phase/oily phase ratio made it possible to reduce the white marks relative to those observed for a 95/5 ratio or for a 70/30 ratio.

[0171] The addition of 0.5% of olive oil made it possible to prevent the white marks observed against the wall facing the oily phase in the test with dicaprylyl ether, and especially to improve the sharpness of the interface.

[0172] Conclusions after 10 cycles of shaking (observations on D11 before shaking) [0173] Protocol: 10 cycles (20°C) of 24h. Bottle filled to 4/5. For each cycle:

- Observe the appearance without shaking of the phases and interface

- shake the bottle 10 times

- appearance after shaking of the phases - appearance after 24 h of the phases and interface

[0174] Results: It is noted that the good results observed above on D2 are the same on D11: The sharpness of the interface of the two-phase product at rest remains unchanged and thus stable, after several cycles (in this instance 10 cycles) of use of the two-phase product, in the case of the examples according to the invention. The plant oil makes it possible to have even more robust stability (beyond 15 cycles) with an improved sharp interface.

[0175] Comparison of the rate of demixing as a function of the surfactant content and influence of the content of plant oil on the rate of demixing

[0176] The rate of demixing of the two-phase products below at 10, 20, 30 seconds and 1 minute (visible or invisible interface) is compared to evaluate the effect of the addition of plant oil on the demixing.

[0177] [Table 8]

Ό178] Conclusion: [0179] A slight decrease in the rate of demixing is observed for the formulations of Examples 23 to 26, containing 0.057% of decyl glucoside AM, for increasing contents of plant oil: the interface is visible from 20 seconds and especially at 30 seconds and the interface is then sharp at 1 minute. The addition of plant oil (in a low content, from 0.5% or 1%) makes it possible to slow down by a few tens of seconds the appearance of the interface, and thus to reduce the rate of demixing of the two-phase product. Thus, by means of the addition of plant oil, the two-phase product remains emulsified for a few additional tens of seconds, for example up to 1 minute after shaking, the time to allow deposition of homogeneous two-phase product on cotton wool and then to perform complete makeup removal of the face.

[0180] Test of using a makeup-removing two-phase product according to the invention, under dermatological and ophthalmological control with a questionnaire for self-evaluation by the users

[0181] [Table 9]

[0182] Protocol: [0183] The makeup-removing two-phase formula according to the invention is tested by a panel of trained experts: 53 women, who are regular users of makeup-removing two-phase products, 85% of whom are users of long-lasting waterproof makeup. The average age of the panel is 45 (minimum age: 19 years old, maximum age: 65 years old). The nature of their facial skin is, respectively: normal for 12, greasy combination for 13, greasy for 4, dry combination for 14, dry for 9 and very dry for 1 of them. Among all the women of the panel, 28 declared that they had sensitive skin. The nature of their lip skin is: normal for 31 , dry for 20 and very dry for 2 of them. 29 declared that they had sensitive skin on the lips. As regards the eyes, 21 of them had sensitive eyes, 21 wore contact lenses and 11 had normal eyes.

[0184] The duration of the test was 4 weeks, the frequency of application was once a day in accordance with the conventional frequency of use of a two-phase makeup remover, and the site of application was the face. The scoring scale goes from 1 to 5: 1 “totally agree”; 2 “rather agree”; 3 “neither agree nor disagree”; 4 “rather disagree”; 5 “totally disagree”. [0185] The results correspond to the number of cumulative favorable responses (“totally agree” and “rather agree”) relative to the total number of responses for each of the criteria evaluated below.

[0186] Results

[0187] Makeup-removing efficiency: [0188] DO Timm°: the first day immediately after the first application; D28: the 28th day.

[0189] [Table 10]

[0191] Cosmetic properties: [0192] [Table 11]

[0193] Overall opinion: [0194] [Table 12]

Ό195] In summary, the transparent two-phase composition according to the invention, combining C5 diol, C15-C19 alkane oily phase, and a minimum content of decyl glucoside surfactant, and optionally a low content of plant oil, affords not only makeup-removing performance perceived even on waterproof makeup, but also improved working qualities and sensory qualities that are highly appreciated by users.

Claims

[Claim 1] A two-phase composition consisting of an aqueous phase and a nonsilicone oily phase which are separate and transparent, characterized in that:

- the oily phase comprises at least 75% by weight, relative to the total weight of oily phase representing 100%, of at least one compound comprising from 15 to 30 carbon atoms chosen from linear or branched alkanes, fatty alcohol ethers, fatty acid esters and/or fatty alcohol esters, and mixtures thereof.

[Claim 2] The composition as claimed in claim 1 , characterized in that said alkylpolyglycoside surfactant is chosen from alkylpolysaccharides or alkylmonosaccharides, which are preferably non-ethoxylated; preferably, said surfactant is chosen from non-ethoxylated alkylpolyglucosides, preferably alkylpolyglucosides in which the alkyl chain comprises at least 10 carbon atoms, preferably from 10 to 16 atoms; preferably, said at least one surfactant comprises, or even is, decyl glucoside.

[Claim 3] The composition as claimed in either of the preceding claims, characterized in that said at least one alkylpolyglycoside surfactant represents from 0.004% to 0.5% by weight, preferably from 0.005% to 0.2%, preferably from 0.006% to 0.2%, preferably from 0.007% to 0.1%, preferably from 0.008% to 0.09% by weight, preferably from 0.009% to 0.08% by weight, preferably from 0.01% to 0.07%, preferably between 0.01% and 0.05% by weight of active material relative to the total weight of the composition.

[Claim 4] The composition as claimed in any one of the preceding claims, characterized in that said diol is of C5-C10, preferably chosen from pentylene glycol (or 1,2- pentanediol), hexylene glycol, 1,2-hexanediol, 1,6-hexanediol, caprylyl glycol (or 1,2- octanediol) and mixtures thereof; preferably, said at least one diol comprises, or even is, pentylene glycol.

[Claim 5] The composition as claimed in any one of the preceding claims, characterized in that said at least one diol represents a weight content of from 1 % to 10%, preferably from 1% to 5%, preferably from 1% to 4%, preferably from 1% to 3%, preferably from 1.5% to 2.5%, by weight of active material relative to the total weight of the composition.

[Claim 6] The composition as claimed in any one of the preceding claims, characterized in that the compound(s) comprising from 15 to 30 carbon atoms in the oily phase represent more than 75%, preferably more than 80%, preferably more than 85%, preferably more than 90%, preferably more than 95%, by weight relative to the total weight of the oily phase.

[Claim 7] The composition as claimed in any one of the preceding claims, characterized in that any alkane present in the oily phase comprises more than 14 carbon atoms, preferably more than 15 carbon atoms, preferably more than 16 carbon atoms.

[Claim 8] The composition as claimed in any one of the preceding claims, characterized in that said at least one compound of the oily phase is chosen from linear and/or branched C15-28 alkanes and mixtures of alkanes, and/or fatty alcohol ethers and/or fatty acid esters and/or fatty alcohol esters including from 16 to 24 carbon atoms, and mixtures thereof; preferably, said compound is chosen from linear and/or branched C15-C28, preferably C15-C19, alkanes and mixtures of alkanes.

[Claim 9] The composition as claimed in any one of the preceding claims, characterized in that said at least one compound comprising from 15 to 30 carbon atoms, preferably alkane, represents at least 5% by weight, preferably from 5% to 45% by weight, preferably from 5% to 30%, preferably from 10% to 25%, preferably from 12% to 20% by weight, relative to the total weight of the two-phase composition representing 100%.

[Claim 10] The composition as claimed in any one of the preceding claims, characterized in that the aqueous phase/oily phase weight ratio is within the range from 95/5 to 55/45, preferably within the range from 95/5 to 65/35, preferably from 90/10 to 70/30, preferably from 90/10 to 80/20.

[Claim 11] The composition as claimed in any one of the preceding claims, characterized in that the composition contains less than 1%, preferably less than 0.5%, preferably less than 0.2%, preferably less than 0.1% by weight of silicone oil relative to the total weight of the composition, and ideally the two-phase composition is free of any silicone oil.

[Claim 12] The composition as claimed in any one of the preceding claims, characterized in that the oily phase also comprises at least one plant oil, which is preferably an organic oil, preferably in a content ranging from 0.01% to 10%, preferably from 0.1% to 7%, preferably from 0.2% to 5%, preferably from 0.3% to 3%, preferably from 0.4% to 2% relative to the total weight of the two-phase composition.

[Claim 13] The composition as claimed in claim 12, characterized in that the plant oil is chosen from apricot oil, sweet almond oil, argan oil, arnica oil (macerate), sunflower oil, avocado oil, bay laurel berry oil, baobab oil, jojoba oil, neem oil, nigella oil, castor oil, broccoli oil, beauty-leaf oil, tamanu oil, camellia oil, safflower oil, coconut oil, coconut kernel oil, evening primrose oil, organic beauty-leaf oil, barbary fig oil, macadamia oil, moringa oil, hazelnut oil, grapefruit pip oil, perilla oil, grapeseed oil, rocket oil, sesame oil, sunflower oil, dhatelo oil, dog rose oil, musk rose oil, acai oil, sea buckthorn oil, walnut oil, tiger nut oil, carrot oil, barbary fig oil, bearberry oil, black cumin oil, marrow seed oil, evening primrose oil, buriti oil, wheat germ oil, pomegranate oil, babassu oil, milk thistle oil, oily extract of tepescohuite, amaranthus oil, passionfruit oil, rice bran oil, raspberry oil, poppy oil, karanja oil, candlenut oil, cranberry seed oil, chia oil, hemp oil, cotton oil, groundnut oil, oat oil, organic dog rose oil, Inca inchi oil, blackcurrant oil, rapeseed oil, cucumber oil, coconut kernel oil, marrow oil, cranberry oil, fenugreek oil, mustard seed oil, maritime pine oil, organic pomegranate oil, mango oil and soybean oil.

[Claim 14] The use of at least one plant oil chosen from those listed in claim 13, in a two- phase composition as defined in any one of claims 1 to 11, for, after shaking said composition, slowing down the rate of demixing of the two phases of the composition, and/or improving the sharpness of the interface between the two phases and/or prolonging the sharpness of the interface at rest of the two-phase product after at least three cycles of use of the two-phase product, characterized in that the content of plant oil is within the range from 0.01% to 10%, preferably from 0.1% to 7%, preferably from 0.2% to 5%, preferably from 0.3% to 3%, preferably from 0.4% to 2%, relative to the total weight of the two-phase composition.

[Claim 15] A cosmetic process for removing makeup from, cleansing and/or caring for the skin, the lips and/or the eyes, the body or the hair, characterized in that a cosmetic composition as claimed in any one of claims 1 to 13 is applied to the skin, the lips and/or the eyes, or the hair.