FR3112076A1 - Two-phase composition comprising an alkylpolyglycoside surfactant, a particular diol and an alkane, ester or ether compound comprising from 15 to 30 carbon atoms - Google Patents

Abstract

Two-phase composition comprising an alkylpolyglycoside surfactant, a particular diol and an alkane, ester or ether compound comprising from 15 to 30 carbon atoms The present application relates to a two-phase composition consisting of an aqueous phase and a separate non-silicone oily phase transparent, characterized in that the aqueous phase comprises water, at least one alkylpolyglycoside surfactant, and at least one diol comprising at least 5 carbon atoms, preferably C5-C10, and the oily phase comprises at least 75% by weight on the total weight of oily phase representing 100%, of at least one alkane, ether or ester compound comprising from 15 to 30 carbon atoms. A subject of the present invention is also the use of vegetable oil in such a two-phase composition for, after agitation of the said composition, slowing down the speed of demixing of the 2 phases of the composition and/or improving the sharpness of the interface between the 2 phases and/or prolong the sharpness of the interface at rest of the biphase after several cycles of use of the biphase.

Description

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

The present invention relates to a composition for topical application, consisting of two distinct phases, an aqueous phase and an oily phase, which easily emulsifies on stirring and quickly dephases after stopping the stirring. The present invention also relates to the use of said composition in the cosmetic or dermatological field, and in particular for removing make-up, cleaning and/or caring for the skin, mainly of the face, and in particular of the lips and/or eyes, and for body care and/or hair care.

Background of the invention

Compositions of this type consisting of two distinct phases, in particular an aqueous phase and an oily phase which are distinct and not emulsified one in the other on standing, are generally designated by the term "two-phase compositions" or " two-phase compositions” or even more simply “biphase”. They are distinguished from emulsions by the fact that, at rest, the two phases are distinct 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 therefore multiple, these interfaces generally being stabilized by emulsifying surfactants and/or emulsifying polymers. The use of two-phase compositions requires prior agitation in order to form an extemporaneous emulsion. This must be of sufficient quality and stability to allow a homogeneous application of the two phases but such that at rest the two phases quickly separate and return to their initial state, this phenomenon being better known by the term “phase shift”.

Rapid dephasing (or demixing or demixing) of the two phases after their use constitutes one of the desired qualities of two-phase compositions. Indeed, obtaining a rapid phase shift is desirable for various reasons, in particular because poor separation of the two phases is perceived as being unsightly by users.

In addition, there is an increasing demand for limpid compositions, that is to say transparent, because, just like water, transparency is the symbol of purity and therefore of cleanliness. Transparent compositions are thus particularly appreciated by users, these compositions are generally presented in transparent containers, and the opacity of the two phases is aesthetically detrimental.

The use, in two-phase compositions, of silicone oils such as for example cyclopentasiloxane, in a suitable quantity can make it possible to obtain two-phase compositions consisting of two distinct immiscible phases which form, after agitation, an emulsion, while keeping the properties sought for two-phase compositions, that is to say a rapid phase shift into two transparent phases.

Two-phase compositions based on cyclic silicone oils have already been described, for example, in documents EP 0 370 856 and EP 0 603 080, in particular for removing make-up from the eyes.

However, consumers are increasingly looking for cosmetic products formed from natural constituents or of natural origin, in particular products that do not include silicone compounds.

The document FR2939662 proposes a two-phase compositions based on non-silicone oils consisting of two distinct immiscible phases, which after agitation gives a transparent emulsion, while retaining the properties sought for two-phase compositions, that is to say a phase shift fast in two transparent phases and a clean 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 non-silicone oils relative to the weight of oily phase, the amounts of polyols and non-silicone oils being such that the refractive indices of the oily and hydrophilic phases are substantially equal. In this document, the polyol is chosen from glycerin, glycols, sorbitol, sugars, and mixtures thereof. The glycols being chosen from methyl propanediol, 1,3 propane diol, butylene glycol, propylene glycol, isoprene glycol, dipropylene glycol, hexylene glycol and polyethylene glycols. In this document, the non-silicone oil is chosen from fatty acid esters comprising from 8 to 29 carbon atoms, such as isodecyl neopentanoate, dicaprylyl ether, dicaprylyl carbonate, isopropyl myristate, palmitate of isopropyl, ethyl-2-hexyl palmitate, octyl-2-dodecyl stearate; linear hydrocarbons such as Parleam® oil and petroleum jelly; hydrocarbon oils of vegetable origin such as apricot kernel oil, essential oils, perfumes, volatile linear alkanes, volatile linear alkanes comprising from 7 to 17 carbon atoms such as undecane, tridecane, C8-C16 iso-alkanes such as isododecane, isodecane, isohexadecane.

Document WO2014/013420 describes a composition for topical application, consisting of two distinct phases, a hydrophilic phase and an oily phase, which easily emulsify by stirring, giving an emulsion and which dephase rapidly after stopping the stirring, exhibiting a perfectly clean interface, without the presence of foam or residual volutes considered unsightly and prohibitive for the user by using a hydrophilic phase comprising one or more non-ethoxylated alkylpolyglucoside in a determined quantity and an oily phase comprising one or more particular esters, chosen from the fatty acid esters with a chain length ranging from 8 to 18 carbon atoms and fatty alcohol esters with a chain length ranging from 8 to 18 carbon atoms.

The document EP3062761 describes a transparent two-phase composition consisting of two distinct immiscible phases, comprising little or no silicone compounds, which, after agitation, gives an emulsion, while retaining the properties sought for two-phase compositions, that is to say say a rapid phase shift in two transparent phases, a clear 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 this document uses the combination of a branched alkane comprising 8 to 18 carbon atoms and a particular surfactant chosen from fatty acid and sugar esters and alkylpolyglucosides.

However, depending on the non-silicone oils used, the surfactant content, and any polyols used, the make-up removal effectiveness on waterproof make-up sometimes proves to be insufficient, and the qualities of use of the two-phase can still be improved. Indeed, the demixing (or separation) between the phases must not be too rapid to allow an emulsion to remain formed on cotton, the time for removing make-up from the entire face, for example at least 10 seconds, preferably at least 20 seconds. Conversely, the unmixing must not be too slow either, and the interface must begin to be visible in less than a minute for the user. Finally, the interface between the phases must be perfectly clear after returning to the initial state of the biphase. However, it is not rare in the existing biphases, in particular after several cycles of use of the biphase, to see the formation of foam, bubbles, whitish swirls at the level of the interface, or even small droplets which remain attached to the walls of the transparent container, both in terms of the aqueous phase and the fatty phase. This phenomenon is visually prohibitive, and we seek on the contrary to find each of the 2 phases intact and clear, and their interface perfectly clear.

There therefore remains the need for a two-phase composition consisting of two distinct immiscible phases, comprising little or no silicone compounds, which, after agitation, gives an emulsion, while retaining the properties sought for two-phase compositions, i.e. that is to say a rapid phase shift in two transparent phases, but slow enough for the emulsion to last for the time of makeup removal, a clean interface after returning to rest, without the appearance of droplets which remain attached to the walls of the transparent container.

Surprisingly, the applicant has found that it is possible to obtain a transparent two-phase composition comprising little or no silicone compounds which, after stirring, gives an emulsion for at least 10 seconds or even 20 seconds, and which quickly dephases again in two transparent phases, having a perfectly clean interface and without the appearance of droplets which remain attached to the walls of the transparent container, using the combination of an aqueous phase comprising at least one alkylpolyglucoside surfactant, and a diol comprising at least 5 carbon atoms, and of an oily phase comprising at least 75% by weight of the total weight of oily phase representing 100%, of at least one compound comprising from 15 to 30 carbon atoms and chosen from linear alkanes and/ or branched, fatty alcohol ethers, fatty acid esters and/or fatty alcohol esters.

This combination of ingredients makes it possible to obtain better "usability qualities" for the biphase according to the invention, namely: effective make-up removal, including waterproof make-up, controlled demixing time, adapted to the make-up removal time , and a clean interface without foam between the two phases at rest. These qualities are all the more surprising in that they are verified after several cycles of use of the biphase according to the invention, whereas degradation of the interface is generally observed as the biphases are used. of the prior art.

The subject of the present invention is therefore a two-phase composition consisting of an aqueous phase and a separate transparent non-silicone oily phase, characterized in that:
- the aqueous phase comprises water, at least one alkylpolyglycoside surfactant, and at least one diol comprising at least 5 carbon atoms, and
- the oily phase comprises at least 75% by weight, on 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, ethers of fatty alcohols, fatty acid esters and/or fatty alcohol esters, and mixtures thereof.

Advantageously, said alkylpolyglycoside surfactant is chosen from alkylpolyosides or alkylmonoosides, preferably non-ethoxylated, preferably said surfactant is chosen from non-ethoxylated alkylpolyglucosides, preferably alkylpolyglucosides whose alkyl chain comprises at least 10 carbon atoms, preferably 10 to 16 atoms, preferably said at least one surfactant comprises, or even is, decylglucoside. 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%, of 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 ingredient, on the total weight of the composition.

Advantageously, said diol is 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 content by weight of 1 to 10%, preferably 1 to 5%, preferably 1 to 4%, preferably 1 to 3%, preferably 1.5 to 2.5%, by weight of active material, on the total weight of the composition.

Advantageously, the compound(s) comprising from 15 to 30 carbon atoms in the oily phase represent(s) more than 75%, preferably more than 80%, preferably more than 85%, preferably more than 90% , preferably more than 95%, by weight on the total weight of the oily phase. Advantageously, said at least one compound of the oily phase is chosen from: alkanes and mixtures of linear and/or branched C15-28 alkanes, and/or fatty alcohol ethers and/or acid esters fatty and/or fatty alcohol esters containing from 16 to 24 carbon atoms, and mixtures thereof; preferably, said compound is chosen from alkanes and mixtures of linear and/or branched C15-C28, preferably C15-C19, 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 an 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 12 to 20% by weight, on the total weight of the two-phase composition representing 100%.

Advantageously, the aqueous phase/oily phase weight ratio of the two-phase composition according to the invention is in the range from 95/5 to 55/45, preferably from 95/5 to 65/35, preferably from 90/10 to 70/30, preferably 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 on the total weight of the composition, and ideally the two-phase composition of the invention is free of any silicone oil.

Advantageously, the oily phase also comprises at least one vegetable oil, preferably organic, preferably according to 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%, on the total weight of the two-phase composition. The vegetable oil is preferably chosen from apricot, sweet almond, argan, arnica (macerate), sunflower, avocado, bay laurel, baobab, jojoba, neem, nigella, castor, broccoli, calophyll, tamanu, camelia, safflower, coconut, copra, evening primrose, organic calophyll, prickly pear, macadamia, moringa, hazelnut, grapefruit seed, perilla, grape seed, arugula, sesame, sunflower, Dhatelo, rosehip, rosehip, Acai, sea buckthorn, walnut, tigernut, carrot, prickly pear, bearberry oil, black cumin, pumpkin seeds, buriti evening primrose, wheat germ, pomegranate, Babassu, milk thistle, oily extract of tepescohuite, amaranth, passion fruit, rice bran, raspberry, poppy, karanja oil, kukui oil, cranberry seed oil, chia, hemp, cottonseed, peanut, oat , organic rosehip, Inca Inch i, blackcurrant, rapeseed, cucumber, copra, squash, cranberries, fenugreek, mustard seeds, maritime pine seeds, organic pomegranate, mango, soy.

A subject of the present invention is also the use of at least one vegetable oil, preferably organic, preferably as mentioned above, in a two-phase composition according to the invention, for, after agitation of the said composition, after agitation of said composition, slow down the rate of demixing of the 2 phases of the composition, and/or improve the sharpness of the interface between the 2 phases and/or prolong the sharpness of the interface at rest of the biphase after at least 3 cycles of use of biphase, characterized in that the vegetable oil content is in 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 0.4 to 2%, based on the total weight of the two-phase composition.

The present invention also relates to a cosmetic process for removing make-up, for cleaning and/or caring for the skin, the lips and/or the eyes, the body or the hair, characterized in that one applies to the skin, the lips and/or the eyes, or the hair, a cosmetic composition according to the invention as detailed in the present description.

detailed description

The (biphase) composition of the invention is effective for removing waterproof make-up, without leaving greasy residue on the skin, and has better qualities of use in terms of demixing time (sufficient to remove make-up) and quality of demixing (clear interface and clear phases), verified after several cycles of use of the biphase according to the invention.

Since the composition of the invention is intended for topical application, it contains a physiologically acceptable medium, that is to say compatible with the skin, the mucous membranes, the hair and the scalp.

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

Within the meaning of the present invention, and unless a different indication is given:

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 this range (for example "in the range of X to Y").

The word “transparent” means that the phase has a turbidity less than or equal to 300 NTU. The transparency of a composition can be measured by its turbidity, and NTUs (Nephelometric Turbidity Units) are the units of measurement of the turbidity of a composition. The turbidity measurement can be made for example with a model 2100P turbidimeter from HACH Company, the tubes used for the measurement being referenced AR397A cat 24347-06. The measurements are carried out at room temperature (20°C to 25°C). The two distinct 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.

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

Advantageously, the aqueous phase/oily phase weight ratio of the biphase according to the invention is included in the range from 95/5 to 55/45, preferably included in the range from 95/5 to 65/35, preferably from 90/ 10 to 70/30, preferably 90/10 to 80/20.

Aqueous phase

The aqueous phase therefore generally represents from 5 to 95% by weight, preferably from 40 to 95% by weight, better still from 50 to 95% by weight, relative to the total weight of the composition.

Advantageously, the aqueous phase of the biphase according to the invention represents a content by weight comprised in 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.

The aqueous phase (also called 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 on the total weight of the composition.

The water used can be sterile demineralised water and/or floral water such as rose water, cornflower water, chamomile water or linden water, and/ or natural thermal or mineral water, such as: Vittel water, water from the Vichy basin, Uriage water, water from Roche Posay, water from La Bourboule, water water from Enghien-les-Bains, water from Saint Gervais-les-Bains, water from Néris-les-Bains, water from Allevar-les-Bains, water from Digne, water from Maizières, water from Neyrac-les-Bains, water from Lons-le-Saunier, Eaux Bonnes, water from Rochefort, water from Saint Christau, water from Fumades and water from Tercis -les-bains, water from Avene. The aqueous phase can also comprise reconstituted thermal water, that is to say water containing trace elements such as zinc, copper, magnesium, etc., reconstituting the characteristics of thermal water.

diol

The aqueous phase of the composition of the invention further comprises at least one diol comprising at least 5 carbon atoms, preferably 5 to 10 carbon atoms, preferably 5 to 8 carbon atoms, even more preferably from 5 to 6 carbon atoms, or even better 5 carbon atoms.

Said diol comprising 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.

Said at least one diol with at least 5 carbon atoms represents a content by weight of 1 to 10%, preferably 1 to 5%, preferably 1 to 4%, preferably 1 to 3%, preferably 1.5 to 2.5%, by weight of active material, on the total weight of the composition.

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

Advantageously, the composition does not include any other 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%, on the total weight of the composition, of any other polyol(s) that said diol comprising at least 5 carbon atoms defined according to the invention. By “polyols”, it is necessary to understand any organic molecule comprising 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 glycerin, glycols such as butylene glycol, propylene glycol, methyl propanediol, 1,3 propanediol, isoprene glycol, dipropylene glycol, and polyethylene glycols, sorbitol, sugars such as glucose, and mixtures thereof.

Advantageously, the composition of the invention does not comprise a monoalcohol, that is to say an alcohol comprising from 1 to 6 carbon atoms in which a single hydroxyl group is bonded to one of the carbon atoms, such as than ethanol and isopropanol.

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 appropriate when the composition according to the invention is used as a product for the body or for the hair.

Alkylpolyglycoside

The composition according to the invention comprises at least one alkylpolyglycoside surfactant, the latter forming part of the aqueous phase of the biphase in particular before stirring.

Within the meaning of the present invention, the term "alkylpolyglycoside" means an alkylmonooside (degree of polymerization 1) or alkylpolyoside (degree of polymerization greater than 1).

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

The saccharide residue can be chosen from: glucose, dextrose, sucrose, fructose, galactose, maltose, maltotriose, lactose, cellobiose, mannose, ribose, dextran, talose, allose, xylose, levoglucan, cellulose or starch. More preferably, the saccharide residue denotes glucose.

It should also be noted that each unit of the polysaccharide part of the alkylpolyglycoside can be in the α or β isomeric form, in the L or D form and the configuration of the saccharide residue can be of the furanoside or pyranoside type.

It is of course possible to use mixtures of alkyl polysaccharides, which may differ from each other by the nature of the alkyl unit carried and/or the nature of the carrier polysaccharide chain.

In particular, mention may be made of alkylpolyglucosides containing an alkyl group comprising from 6 to 30 carbon atoms and preferably from 8 to 16 carbon atoms, and containing a glucoside group preferably comprising 1.2 to 3 saccharide units. Mention may be made, for example, of decylglucoside such as alkyl-C9/C11-polyglucoside (1,4) in 40% aqueous solution such as the product marketed under the name MYDOL 10® by the company Kao Chemicals, alkyl-C10 /C12/C14 85/10/5-polyglucoside (1,4) in 55% aqueous solution, such as the product marketed under the name ORAMIX NS 10® by the company Seppic; and caprylyl/caprylglucoside such as 50/50 C8/C10 alkyl/polyglucoside (2) in 60% aqueous solution, such as the product marketed under the name ORAMIX CG 110® by the company Seppic.

Advantageously, said alkylpolyglycoside surfactant is chosen from alkylpolyosides or alkylmonoosides, preferably non-ethoxylated. Preferably, said surfactant is chosen from non-ethoxylated alkylpolyglucosides, preferably chosen from decylglucoside and/or caprylyl/caprylglucoside, preferably said surfactant comprises decylglucoside.

Such a surfactant allows both a demixing adapted to the two-phase of the invention, a good cleansing effectiveness, and has the additional advantage of being of natural origin, of renewable raw materials and easily biodegradable.

Advantageously, said at least one alkylpolyglycoside of the two-phase composition of the invention preferably comprises an alkylpolyglycoside whose alkyl chain comprises at least 10 carbon atoms, preferably from 10 to 16 atoms. The critical micellar concentration (CMC) of the long-chain alkylpolyglycosides (at least 10 carbon atoms) preferred according to the invention is relatively lower than that of the other less preferred alkylpolyglycosides according to the invention. This low CMC which characterizes the preferred surfactant according to the invention also makes it possible to use the lowest possible content of surfactant in the biphase according to the invention. Above their CMC in the aqueous phase, said alkylglycosides have very low interfacial tensions with respect to the oily phase according to the invention while allowing an optimal phase shift for the biphase. This use of long-chain alkylpolyglycosides according to the invention contributes to improving the make-up removing effectiveness of the biphase, in particular thanks to the presence of micelles, and to the best compromise of emulsion/phase shift cycles obtained with the biphase composition according to the invention.

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 material active, on the total weight of the composition.

From a content of 0.004% by weight of active ingredient of alkylpolyglycoside surfactant, the composition according to the invention has an acceptable demixing, both rapid and for a sufficient time to allow the application of a homogeneous juice on cotton , whereas a surfactant content of less than 0.004% in the composition tends to produce a heterogeneous juice on cotton, the demixing between the 2 phases being too rapid.

In addition, from a content of at least 0.01%, by weight of active material of alkylpolyglycoside surfactant, the two-phase composition of the present invention is advantageously micellar.

Oil phase

The oily phase is also called “lipophilic phase” or even “liquid fatty phase”.

By “oils”, in the present application is meant compounds and/or mixtures of compounds that are insoluble in water, appearing in a liquid aspect at a temperature of 25° C.

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

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.

The oily phase of the composition according to the invention preferably comprises one or more apolar or weakly polar oil(s) having a polarity parameter δa of less than 7.0 J/cm3)1/2.

In particular, the oily phase of the composition according to the invention is characterized in that it comprises at least 75% by weight, on the total weight of oily phase representing 100%, of at least one compound comprising from 15 to 30 atoms carbon 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 also mixtures of esters, and mixtures of 2 or more of these different types of compounds.

Advantageously, said compound comprising from 15 to 30 carbon atoms of is chosen both from: linear or branched purely hydrocarbon alkanes, fatty alcohol ethers and/or fatty acid esters and/or esters of fatty alcohols having at least one linear or branched hydrocarbon fatty chain, provided that said alkane, ether or ester has a total number of carbons in the molecule comprised in the range of 15 to 30.

By "Cx-Cy" or "C _X -C _Y " compound within the meaning of the invention, where x and y respectively represent a number, is meant the compounds whose total number of carbon atoms is included in the range from x to y (with the exception of the cases where it is expressly specified that it is an alkyl chain which is in Cx-Cy in which case it is the number of carbons of the said chain).

By "alkanes" is meant within the meaning of the invention the compounds comprising at least one saturated hydrocarbon chain consisting of carbon (C) and hydrogen (H) atoms, bonded together by single bonds, said at least a hydrocarbon chain of these compounds which may comprise one or more branches.

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.

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

- linear or branched C15-30 alkanes, in particular chosen from mixtures of alkanes having from 15 to 19 carbon atoms, in particular mixtures of cyclic or acyclic hydrocarbons, linear or branched, containing from 15 to 19 carbon atoms , or mixtures of alkanes having from 18 to 21 carbon atoms, such as mixtures of cyclic or acyclic hydrocarbons, linear or branched, having from 18 to 21 carbon atoms, or those having from 21 to 28 carbon atoms of carbon, in particular mixtures of cyclic or acyclic hydrocarbons, linear or branched, comprising from 21 to 28 carbon atoms, and among them, preferably those of plant origin, mixtures of C15 to C19 alkanes (having 15 to 19 carbon atoms) being very particularly preferred; and or

- fatty alcohol ethers and/or fatty acid esters and/or fatty alcohol esters, said ethers or esters comprising a total of 15 to 30 carbon atoms, preferably 15 to 28, preferably from 16 to 24 carbon atoms; preferably comprising at least one saturated hydrocarbon fatty chain, linear or branched, comprising 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;

and their mixtures.

C15-28 alkanes are very particularly preferred, said compound consisting of the oily phase being chosen from: mixtures of alkanes having from 15 to 19 carbon atoms, or else mixtures of alkanes having from 18 to 21 carbon, or else those having from 21 to 28 carbon atoms, and among them, preferably those of vegetable origin.

These mixtures of alkanes are preferably derived from the implementation of preparation processes as described in patent applications WO2011/061612 and WO2011/061716.

Advantageously, said at least one compound used in the composition according to the invention, preferably chosen from alkanes and mixtures of alkanes, preferably C15-28, is derived from raw materials of plant origin, in particular palm, preferably Cosmos compliant.

Such mixtures of alkanes are in particular marketed, respectively under the names EMOSMART® of grades L19, V21, C28, or else EMOGREEN® of grades L15, or even L19, by Seppic. For a composition according to the invention, the EMOGREEN® L19 grade is very particularly preferred.

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

Among the fatty alcohol ethers and/or the fatty acid esters and/or the fatty alcohol esters are meant the oils of formulas R1COOR2 and R1OR2 in which R1 represents the residue of a fatty acid comprising from 8 to 36 carbon atoms, in the form of a linear or branched saturated hydrocarbon fatty chain containing from 8 to 36 carbon atoms, and R2 represents a hydrocarbon chain, branched or not, containing from 8 to 36 carbon atoms.

C ₁₄ -C ₃₆ fatty alcohol and/or fatty acid esters, preferably C ₁₅ -C ₃₂ , preferably C ₁₅ -C ₃₀ , preferably C 16 -C 28 , preferably C ₁₆ -C ₂₈ , preferably C ₁₆ -C ₂₄ are advantageously chosen from: ethyl-hexyl palmitate, isopropyl palmitate, ethyl myrystate, myristyl myristate, butyl stearate, ethyl-hexyl stearate, octyldodecyl stearate, stearyl heptanoate, stearyl caprylate.

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

Preferably, the C ₁₅ -C ₃₀ compound or compounds in the oily phase represent(s) more than 75%, preferably more than 85%, preferably more than 95%, or even more than 98%, by weight on the total weight of the oily phase.

Advantageously, said at least one C ₁₅ -C ₃₀ 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, on the total weight of the two-phase composition representing 100%.

According to one embodiment of the invention, the composition comprises at least one additional non-silicone oil chosen from the following apolar or weakly polar oils, non-silicone oils, other than said at least one C ₁₅ -C ₃₀ alkane defined above .

Apolar or weakly polar oils

By apolar or weakly polar oil is meant in the sense of the invention an oil having a polarity parameter δ _a of less than 7.0 (J/cm ³ ) ^1/2 .

By polarity parameter is meant, within the meaning of the invention, the average parameter δa reflecting the polarity of a molecule: the higher the value of δa, the higher the polarity of the molecule.

The average parameter δa is defined as a function of the Hansen solubility parameters δp and δh, according to the relationship δ _a = (δ _p ² + δ _h ² ) ^1/2 .

The parameters δ _p and δ _h respectively characterize the Debye interaction forces between permanent dipoles and the ability of a compound to form hydrogen bonds. These parameters are defined according to HANSEN's solubility parameter space in J. Paint Technology 39, 195 (1967), The Three Dimensional Solubility Parameter - Key to Paint Component Affinities.

The other apolar oils according to the invention are in particular hydrocarbons, in particular branched and/or unsaturated hydrocarbons of synthetic or mineral origin, volatile or not, such as paraffin oils, volatile (isoparaffins or isododecane) or non-volatile, and its derivatives, petrolatum, liquid lanolin, polydecenes, hydrogenated polyisobutene such as Parleam (from NIPPON Gel Fats), squalane; fluorinated oils, in particular perfluorinated oils; and mixtures thereof, fatty alcohols which are liquid at room temperature having 8 to 26 carbon atoms, such as octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol or oleyl alcohol, and volatile linear alkanes comprising from 7 to 14 carbon atoms such as undecane, 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 which are described in patent applications from Cognis WO 2007/068371, or WO2008/155059 (mixtures of distinct alkanes differing by at least one carbon). These alkanes are obtained from fatty alcohols, themselves obtained from copra or palm oil.

By way of example of linear alkanes other than the C15-C30 alkane defined according to the invention or less preferred alkanes for the composition according to the invention, mention may in particular 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), n-tetradecane (C14), and mixtures thereof.

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.

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.

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

These last two embodiments make it possible to reduce even more effectively the risk of foam at the interface between the 2 phases after agitation then return to rest of the biphase.

Vegetal oils

According to an advantageous embodiment of the invention, the oily phase also comprises at least one vegetable oil, preferably organic, preferably according to 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%, on the total weight of the two-phase composition.

The vegetable oil is advantageously chosen from apricot, sweet almond, argan, arnica (macerate), sunflower, avocado, bay laurel, baobab, jojoba, neem, nigella, castor, broccoli, calophylle, tamanu, camelia, safflower, coconut, copra, evening primrose, organic calophylle, prickly pear, macadamia, moringa, hazelnut , grapefruit seed, perilla, grape seed, arugula, sesame, sunflower, Dhatelo, rosehip, rosehip, Acai, sea buckthorn, walnut, tiger nut, carrot , prickly pear, bearberry oil, black cumin, pumpkin seeds, buriti evening primrose, wheat germ, pomegranate, Babassu, milk thistle, oily extract of tepescohuite, amaranth , passion fruit, rice bran, raspberry, poppy, karanja oil, kukui oil, cranberry seed oil, chia, hemp, cottonseed, peanut, oat, organic rose hips, Inca In chi, blackcurrant, rapeseed, cucumber, copra, squash, cranberries, fenugreek, mustard seeds, maritime pine seeds, organic pomegranate, mango, soy.

In this embodiment, the addition of a certain content of vegetable oil according to the invention makes it possible to better control the speed of demixing, and in particular to slow down from a few seconds to a few tens of seconds the instant or the interface reappears between the 2 phases of the biphase at rest.

A subject of the present invention is therefore also the use of vegetable oil as defined above in a two-phase composition according to the invention for, after agitation of the said composition, slowing down the speed of demixing of the 2 phases of the composition.

In addition, the use of vegetable 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 2 phases and/or to prolong the sharpness of the interface biphase at rest even after several cycles (at least 3 cycles) of biphase use.

A subject of the present invention is therefore also the use of at least one vegetable oil chosen from those defined or listed above, in a two-phase composition according to the invention for, after agitation of the said composition, slowing down the speed of demixing of the 2 phases of the composition, and/or improve the sharpness of the interface between the 2 phases and/or prolong the sharpness of the interface of the biphase at rest even after several cycles (at least 3 cycles) of use of the biphase, characterized in that the vegetable oil content is in the range of 0.01 to 10%, preferably 0.1 to 7%, preferably 0.2 to 5%, preferably 0.3 to 3% , preferably from 0.4 to 2%, based on the total weight of the two-phase composition.

Silicone oils

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 on the weight total of the composition, and ideally the two-phase composition of the invention is free of any silicone oil.

Among these silicone oils, mention may be made, for example, of volatile silicone oils, such as cyclopolydimethylsiloxanes (INCI name: cyclomethicone), such as cyclopentasiloxane, cyclohexasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodeca-methylcyclohexasiloxane; linear silicones such as heptamethylhexyl-trisiloxane, heptamethyloctyl-trisiloxane, hexamethyl-disiloxane, octamethyl-trisiloxane, decamethyltetrasiloxane, dodecamethyl pentasiloxane, or else non-volatile silicone oils, such as polymethylsiloxanes, in particular PDMS , and phenylated polymethylsiloxanes such as phenyltrimethicones, phenyldimethicones, phenyltrimethylsiloxydiphenyl-siloxanes, diphenyl-dimethicones, diphenylmethyldiphenyl trisiloxanes, 2-phenylethyltrimethyl-siloxysilicates, and polymethylphenylsiloxanes; polysiloxanes modified with fatty acids, fatty alcohols or polyoxyalkylenes, and mixtures thereof.

Additional surfactants

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

According to a particular embodiment, the composition according to the invention may optionally comprise at least one additional surfactant different from the surfactants as defined previously in one or the other of the phases. When it contains an additional surfactant, this 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.

The total amount of surfactant(s) in active material in the composition must be in an amount such that the two phases remain distinct on standing and do not mix to form an emulsion. This total amount should generally be less than or equal to 1.5% by weight relative to the total weight of the composition. It can 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.

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 1.1% by weight of active material of additional surfactants, on the total weight of the composition, and more preferably the composition of the invention is free of additional surfactants.

Among the additional nonionic surfactants, those which are particularly preferred are: polyoxyethylenated sorbitol fatty esters 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 RÖHM-HAAS; ethylene oxide and propylene oxide condensates 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, L 92, P 103, F108 and F127; esters of fatty acids and of glycerol or of polyglycerol such as for example glyceryl isostearate, polyglyceryl 3 diisostearate, glyceryl caprylate; polyethylene glycol and/or polypropylene glycol and glycerol ethers such as glycereth-7, glycereth-26, PPG-24 glycereth-24; esters resulting from the reaction of a) fatty acids and b) polyethylene glycol and/or polypropylene glycol glycerol ethers such as for example glycereth-2 cocoate, glycereth-25 PCA isostearate; esters of sucrose and fatty acids different from those defined above, comprising from 12 to 30 carbon atoms, in particular 14 to 20 carbon atoms, said esters possibly comprising from 2 to 5 fatty chains, such as for example sucrose distearate, sucrose tristearate; polymeric emulsifiers such as hydrophobic modified inulins, for example INUTEC SP1 marketed by the company BENEO BIO BASED CHEMICALS.

Among the anionic surfactants, mention may be made in particular of:

- alkyl sulfates, alkyl ether sulfates and their salts, in particular their sodium salts, such as 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 Henkel company; sodium lauryl ether sulphate (C12-14 70/30) (2.2 EO) marketed under the names SIPON AOS 225 or TEXAPON N702 PATE by the company Henkel, ammonium lauryl ether sulphate (C12-14 70/30 ) (3 EO) marketed under the name SIPON LEA 370 by the company Henkel; ammonium (C12-C14) alkyl ether (9 EO) sulphate marketed under the name RHODAPEX AB/20 by the company Rhodia Chimie;

- alkylsulfoacetates such as that sold under the name LATHANOL LAL by the company STEPAN;

- alkyl sulfosuccinates, for example lauryl alcohol mono-sulfosuccinate (C12/C14 70/30) oxyethylenated (3 EO) marketed under the names SETACIN 103 SPECIAL, REWOPOL SB-FA 30 K 4 by the company Witco, the di-sodium salt of a hemi-sulfosuccinate of C12-C14 alcohols, marketed under the name SETACIN F SPECIAL PASTE by the company Zschimmer Schwarz, the oxyethylenated di-sodium oleamidosulfosuccinate (2 EO) marketed under the name STANDAPOL SH 135 by the company Henkel, the oxyethylenated lauryl amide mono-sulfosuccinate (5 EO) marketed under the name LEBON A-5000 by the company Sanyo, the di-sodium salt of oxyethylenated lauryl citrate mono-sulfosuccinate (10 EO) marketed under the name REWOPOL SB CS 50 by the company Witco, the disodium salt of monosulfosuccinate of ricinoleic monoethanolamide marketed under the name REWODERM S 1333 by the company Witco;

- the polypeptides which are obtained for example by condensation of a fatty chain on cereal amino acids and in particular wheat and oats, such as for example the potassium salt of hydrolyzed wheat protein lauroyl, marketed under the name AMINOFOAM W OR by the company Croda, the triethanolamine salt of hydrolyzed cocoyl soy protein, marketed under the name MAY-TEIN SY by the company Maybrook, the sodium salt of oat lauroyl amino acids, marketed under the name PROTEOL OAT by the company Seppic, collagen hydrolyzate grafted on copra fatty acid, marketed under the name GELIDERM 3000 by the company Deutsche Gelatine, soy proteins acylated with hydrogenated copra acids, marketed under the name PROTEOL VS 22 by Seppic;

- Amino acid derivatives, for example from sarcosinates and in particular acylsarcosinates such as sodium lauroylsarcosinate marketed under the name SARKOSYL NL 97 by the company Ciba or marketed under the name ORAMIX L 30 by the company Seppic, sodium myristoyl sarcosinate, marketed under the name NIKKOL SARCOSINATE MN by the company Nikkol, sodium palmitoyl sarcosinate, marketed under the name NIKKOL SARCOSINATE PN by the company Nikkol; alaninates such as sodium N-lauroyl-N-methylamidopropionate marketed under the name SODIUM NIKKOL ALANINATE LN 30 by the company Nikkol or marketed under the name ALANONE ALE by the company Kawaken, and N-lauroyl N-methylalanine triethanolamine, marketed under the name ALANONE ALTA by Kawaken; N-acylglutamates such as triethanolamine mono-cocoylglutamate marketed under the name ACYLGLUTAMATE CT-12 by the company Ajinomoto, and triethanolamine lauroyl-glutamate marketed under the name ACYLGLUTAMATE LT-12 by the company Ajinomoto; aspartates such as the mixture of N-lauroylaspartate of triethanolamine and N-myristoylaspartate of triethanolamine, marketed under the name ASPARACK LM-TS2 by the company Mitsubishi; glycine derivatives, such as sodium N-cocoylglycinate and potassium N-cocoylglycinate, such as the products marketed under the names AMILITE GCS-12 and AMILITE GCK-12 by the company Ajinomoto;

- sulfonates, for example alpha-olefin sulfonates such as sodium alpha-olefin sulfonate (C14-16) marketed under the name BIO-TERGE AS-40 by the company Stepan, marketed under the names WITCONATE AOS PROTEGE and SULFRAMINE AOS PH 12 by the company Witco or marketed under the name BIO-TERGE AS-40 CG by the company Stepan, the secondary sodium olefin sulphonate marketed under the name HOSTAPUR SAS 30 by the company Clariant; linear alkyl aryl sulfonates such as sodium xylene sulfonate marketed under the names MANROSOL SXS30, MANROSOL SXS40, MANROSOL SXS93 by the company Manro;

- isethionates, in particular acylisethionates such as sodium cocoyl-isethionate, such as the product marketed under the name JORDAPON CI P by the company Jordan.

Among the amphoteric or zwitterionic surfactants, mention may be made in particular of:

- alkylamido alkylamine derivatives such as N-cocoyl-N-carboxymethoxyethyl-N-carboxymethyl-ethylenediamine N-di-sodium (CTFA name: Disodium cocoampho-diacetate) sold in aqueous saline solution under the name MIRANOL C2M CONC NP by the company Rhodia Chemistry; N-cocoyl-N-hydroxyethyl-N-carboxymethyl-ethylenediamine N-sodium (CTFA name: sodium cocampho-acetate) and mixture of coconut acid ethanolamides (CTFA name: Cocamide DEA);

- betaines, such as for example cocobetaine like the product marketed under the name DEHYTON AB-30 by the company Henkel, laurylbetaine like the product marketed under the name GENAGEN KB by the company Clariant, oxyethylenated laurylbetaine (10 EO), like the product marketed under the name LAURYLETHER(10 OE)BETAINE by the company Shin Nihon Rica, oxyethylenated stearylbetaine (10 EO) such as the product marketed under the name STEARYLETHER(10 OE)BETAINE by the company Shin Nihon Rica;

- alkylamidopropyl betaines and their derivatives such as for example cocamidopropyl betaine marketed under the name LEBON 2000 HG by the company Sanyo, or marketed under the name EMPIGEN BB by the company Albright & Wilson, lauramidopropyl betaine marketed under the name REWOTERIC AMB12P by the company Witcotels as cocamidopropyl betaine such as the products sold under the names TEGO BETAINE by the company GOLDSCHMIDT;

- imidazoline derivatives such as the product sold under the name CHIMEXANE HD by the company CHIMEX.

Additives

The composition according to the invention may also contain conventional cosmetic adjuvants or additives which will be found in one or the other phase depending on their hydrophilic or lipophilic nature, such as for example hydrophilic gelling agents, preservatives and bactericides, colorants , softening agents, buffers, humectants, U.V. filters (or sunscreens), electrolytes such as sodium chloride or a pH adjuster, for example citric acid or sodium hydroxide), and mixtures thereof.

Depending on the desired viscosity for the composition according to the invention, one or more hydrophilic gelling agents can be incorporated therein. As hydrophilic gelling agents, mention may be made, for example, of carboxyvinyl polymers, modified or not, such as the products marketed under the names Carbopol (INCI name: carbomer) by the company Noveon; polyacrylamides; homopolymers and copolymers of 2-acrylamido 2-methylpropane sulfonic acid, optionally crosslinked and/or neutralized, such as poly(2-acrylamido 2-methylpropane sulfonic acid) marketed by the company Clariant under the name "Hostacerin AMPS" (INCI name : ammonium polyacryldimethyltauramide); polysaccharide biopolymers such as xanthan gum, guar gum, alginates, modified or unmodified cellulose; and their mixtures. 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. As lipophilic gelling agents, mention may be made of alkene copolymers such as, for example, block copolymers of the “diblock”, “triblock” or “radial” type of the polystyrene/polyisoprene, polystyrene/polybutadiene type such as those marketed under the name Luvitol HSB® by the company BASF, of the polystyrene/copoly(ethylene-propylene) type such as those marketed under the name Kraton® by the company SHELL CHEMICAL CO or also of the polystyrene/copoly(ethylene-butylene) type, mixtures of triblock copolymers and radial (star) in isododecane, such as those marketed by PENRECO under the name Versagel®, such as the mixture of butylene/ethylene/styrene triblock copolymer and ethylene/propylene/styrene star copolymer in isododecane (Versagel M5960).

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

As preservatives, one can use any preservative usually used in the fields considered, such as for example parabens, phenoxyethanol, chlorhexidine gluconate, polyhexamethylene biguanide hydrochloride (CTFA name Polyaminopropyl biguanide), or even salicylic acid. According to a preferred embodiment of the invention, the composition contains salicylic acid, alone or mixed with other preservatives.

As bactericide, it is possible, for example, to use a mono(C3-C9)alkyl-or (C3-C9)alkenyl ether of glycerol, 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 mono(C3-C9)alkyl-or (C3-C9)alkenyl ethers of glycerol, 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 more particularly preferred glycerol mono(C3-C9)alkyl ether 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: Ethylhexylglycerin).

Among the softening agents, mention may in particular be made of allantoin and bisabolol, planktons, and certain plant extracts such as rose extracts and sweet clover extracts.

As electrolytes, mention may be made of mono or dipotassium phosphate, sodium chloride, magnesium sulphate, disodium EDTA.

The amount of salt(s) can range, for example, from 0 to 5% by weight and 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. .

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

As dephasing agent, mention may be made, for example, of alkyldimethylbenzylammonium chlorides as described in document EP-A-603080, and in particular benzalkonium chloride, and the mixtures containing it; alkoxylated alkyl glucosides comprising a quaternary ammonium group and in particular lauryl methyl gluceth-10 hydroxypropyldimonium chloride, as described in document EP-A-847746; vinylpyrrolidone polymers and copolymers and in particular the polyvinylpyrrolidone/hexadecene copolymer as described in document WO-A-99/56704; and their mixtures.

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

As active agents which can be used in the composition of the invention, mention may be made, for example, of enzymes (for example lactoperoxidase, lipase, protease, phospholipase, cellulases); flavonoids; moisturizing agents such as protein hydrolysates; sodium hyaluronate; anti-inflammatories; procyanidolic oligomers; vitamins such as vitamin A (retinol), vitamin E (tocopherol), vitamin C (ascorbic acid), vitamin B5 (panthenol), vitamin B3 (niacinamide), derivatives of these vitamins (in particular esters) and their mixtures; urea; caffeine; depigmentants such as kojic acid, hydroquinone and caffeic acid; salicylic acid and its derivatives; alpha-hydroxy acids such as lactic acid and glycolic acid and their derivatives; retinoids such as carotenoids and vitamin A derivatives; hydrocortisone; melatonin; extracts of seaweed, mushrooms, plants, yeasts, bacteria; steroids; antibacterial active agents such as 2,4,4'-trichloro-2'-hydroxy diphenyl ether (or triclosan), 3,4,4'-trichlorocarbanilide (or triclocarban) and the acids indicated above and in particular l salicylic acid and its derivatives; tensioning agents; ceramides; essential oils ; and mixtures thereof; and any active suitable for the final purpose of the composition.

The compositions described above can be packaged, in known manner, in a bottle with a single compartment. The user must then shake the bottle before pouring the contents onto a cotton ball. The product can also be packaged in a “pump bottle” type bottle. According to a particular embodiment, it is a transparent container, generally made of polyethylene terephthalate (PET).

The composition according to the invention can be used for any topical application; in particular, it can constitute a cosmetic or dermatological composition. It can in particular be used for caring for, cleaning and/or removing make-up from the skin, the lips and/or the eyes, and also as a hair care composition.

Thus, a subject of the invention is also the cosmetic use of a cosmetic composition as defined above, for caring for, removing make-up and/or cleansing the skin, lips and/or eyes, and/ or for hair care.

Finally, another subject of the present invention is a cosmetic process for removing make-up, for cleaning and/or caring for the skin, the lips and/or the eyes, the body or the hair, characterized in that one applies to the skin, the lips and/or the eyes, the body or the hair, a two-phase cosmetic composition according to the invention as defined above.

According to a preferred embodiment of the invention, the composition constitutes a composition for cleaning and/or removing make-up from the skin, lips and/or eyes.

The examples below of compositions according to the invention are given by way of illustration and without limiting character. The quantities are given therein in % by weight of raw material, unless otherwise stated. The names of the compounds are indicated in chemical names or in INCI names.

Comparison of different contents of alkylpolyglucoside surfactant in a biphase

The following compositions were prepared.

US INCI Cp1
excluding invention Ex2
according to invention Ex3
according to invention Ex4
according to invention Ex5
according to invention Ex6
according to invention OLEA EUROPAEA (OLIVE) LEAF EXTRACT 0.00306 0.00306 0.00306 0.00306 0.00306 0.00306 SALICYLIC ACID 0.14960 0.14960 0.14960 0.14960 0.14960 0.14960 CITRIC ACID 0.22100 0.22100 0.22100 0.22100 0.22100 0.17000 HORDEUM VULGAR STEM WATER 10.96025 10.96025 10.96025 10.96025 10.96025 10.96025 OLEA EUROPAEA (OLIVE) FRUIT OIL 0.50100 0.50100 0.50100 0.50100 0.50100 0.50100 C15-19 ALKANE 14.49900 14.49900 14.49900 14.49900 14.49900 14.49900 SODIUM BENZOATE 0.03331 0.03331 0.03331 0.03331 0.03331 0.03331 SODIUM HYDROXIDE 0.04250 0.04250 0.04250 0.04250 0.04250 0.04250 PENTYLENE GLYCOL 2.00005 2.00005 2.00005 2.00005 2.00005 2.00005 SODIUM CHLORIDE 0.90015 0.90015 0.90015 0.90015 0.90015 0.90015 WATER 69.48328 69.47861 69.47627 69.47393 69.46926 69.47725 DIPOTASSIUM PHOSPHATE 0.40035 0.40035 0.40035 0.40035 0.40035 0.40035 POTASSIUM PHOSPHATE 0.79985 0.79985 0.79985 0.79985 0.79985 0.79985 DECYL GLUCOSIDE 0 0.00468 0.00701 0.00935 0.01403 0.05704

Minimum level of decylglucoside in the biphase to obtain a homogeneous juice on cotton after agitation of the 2 phases of the biphase, and to obtain a micellar biphase

Biphase 85/15
85% E-stage
% active ingredient DECYL GLUCOSIDE In the aqueous phase % active ingredient DECYL GLUCOSIDE in the biphase Visual evaluation of the product delivered on cotton after agitation of the biphase Detection by spectroscopy DLS of the p presence:
of objects/micelles Cp1
excluding invention 0 0% not acceptable - heterogeneous juice on cotton - demixing too fast No /
non-micellar biphase Ex2
according to invention 0.0055 0.0047 acceptable - homogeneous juice on cotton - rapid demixing No /
non-micellar biphase Ex3
according to invention 0.0083 0.0070 compliant - homogeneous juice on cotton - rapid demixing No /
non-micellar biphase Ex4
according to invention 0.011 0.0094 compliant - homogeneous juice on cotton - rapid demixing Yes / micellar biphase Ex5
according to invention 0.0165 0.014 compliant - homogeneous juice on cotton - rapid demixing Yes / micellar biphase Ex6
according to invention 0.0671 0.057 compliant - homogeneous juice on cotton - rapid demixing Yes / micellar biphase

Characterization of aqueous phases in DLS spectroscopic analysis (“dynamic light scattering” based on the principle of dynamic light scattering):

Protocol:

The aqueous phase samples are first filtered on Acrodisc PSF GxF 0.20µm filters before being analyzed to limit their polydispersity

The measurements were carried out at 20° C. with the Zetasizer Nano ZSP particle size analyzer marketed by Malvern. Its measurement range goes from 0.3 nm to 10 µm.

The concentrations allowing the absence of objects (micelles) to be observed in the aqueous phase are sought. A measurement is considered relevant when the signal-to-noise ratio is sufficient: "Intercept" must be greater than 0.85.

A peak appears at 10 nm for the sample containing 0.011% MA of decyl glucoside in the aqueous phase. This population of objects is not present at 0.00825% MA of surfactant in the aqueous phase. A peak of the order of 1 nm is present in the aqueous phase without TA.

From 0.01% by weight of decylglucoside active ingredient in the aqueous phase (i.e. from 0.009% by weight of active ingredient in the biphase), the biphase is considered “micellar”. This is visible by the additional peak that appeared at 10 nm in DLS spectroscopic analysis, when the decyl glucoside content exceeded the critical micellar concentration in the formula.

Comparison of different polyols in an aqueous phase of biphase micellar make-up remover:

Aqueous phase of BIPHASE micellar make-up remover: INCI Ex 7 according to the invention CP 8 excluding invention Cp9 excluding invention CP 10 excluding invention CP 11 excluding invention CITRIC ACID 0.26 0.26 0.26 0.26 0.26 HORDEUM VULGAR STEM WATER 12,894 12,894 12,894 12,894 12,894 SODIUM HYDROXIDE 0.05 0.05 0.05 0.05 0.05 SODIUM BENZOATE 0.039 0.039 0.039 0.039 0.039 DECYL GLUCOSIDE 0.067 0.067 0.067 0.067 0.067 SALICYLIC ACID 0.176 0.176 0.176 0.176 0.176 SODIUM CHLORIDE 1,059 1,059 1,059 1,059 1,059 CITRIC ACID 0.008 0.008 0.008 0.008 0.008 WATER 81,682 81,682 81,682 81,682 81,682 DIPOTASSIUM PHOSPHATE 0.471 0.471 0.471 0.471 0.471 POTASSIUM PHOSPHATE 0.941 0.941 0.941 0.941 0.941 PENTYLENE GLYCOL 2,353 BUTYLENE GLYCOL 2,353 PROPYLENE GLYCOL 2,353 GLYCERIN 2,353 PROPANEDIOL 2,353 Appearance of the aqueous phase after mixing the ingredients CLEAR Appearance TROUBLE Aspect
heterogeneous TROUBLE Aspect
heterogeneous TROUBLE Aspect
heterogeneous TROUBLE Aspect
heterogeneous

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 with a clear appearance, unlike the other polyols tested such as glycerin or the diols comprising only 2, 3, or 4 carbon atoms.

Comparison of different alkanes used as oily phase (15%) in Biphase:

Ex 12
according to the invention Cp 13
excluding invention Cp 14
excluding invention US INCI TWO-PHASE 85/15 TWO-PHASE 85/15 TWO-PHASE 85/15 SALICYLIC ACID 0.150 0.150 0.150 CITRIC ACID 0.228 0.228 0.228 HORDEUM VULGAR STEM WATER 10,960 10,960 10,960 SODIUM BENZOATE 0.033 0.033 0.033 SODIUM HYDROXIDE 0.043 0.043 0.043 PENTYLENE GLYCOL 2,000 2,000 2,000 SODIUM CHLORIDE 0.900 0.900 0.900 WATER 69,430 69,430 69,430 DIPOTASSIUM PHOSPHATE 0.400 0.400 0.400 POTASSIUM PHOSPHATE 0.800 0.800 0.800 DECYL GLUCOSIDE 0.057 0.057 0.057 C15-19 ALKANE 15,000 ISODODECANE
(of natural origin) 15,000 TRIDECANE (AND) PENTADECANE (28%/72% ratio by weight) 15,000 Observations on D5, after 5 agitation cycles, 24 hours after the last agitation Aqueous phase crystal clear crystal clear crystal clear Oil phase crystal clear Clear, some white traces at the top of the wall crystal clear Interface net Slightly frothy "hydrocarbon slick" effect over almost the entire surface of the interface Foamy ½ cm thick

Comparison of the separation of the aqueous/oily phases:

The visual appearance of the 2 phases, of their interface and of the walls is evaluated 24 hours after agitation and demixing, for different compositions of oily phases, different aqueous phase/oily phase ratios, in the presence/absence of additional vegetable oil ( organic refined olive oil).

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

Aqueous phase E INCI % WATER / AQUA 81.68 DECYL GLUCOSIDE 0.07 PENTYLENE GLYCOL 2.35 SODIUM CHLORIDE 1.06 SODIUM HYDROXIDE 0.05 CITRIC ACID 0.26 HORDEUM VULGAR STEM WATER 12.89 SODIUM BENZOATE 0.04 CITRIC ACID 0.01 SALICYLIC ACID 0.18 DIPOTASSIUM PHOSPHATE 0.47 POTASSIUM PHOSPHATE 0.94

Formula number biphasic Phase H =>
Phase E according to Table 5, and of the content below: C15-19 ALKANE
Dicaprylyl Ether Dicaprylyl Ether + OLEA EUROPAEA FRUIT OIL Tridecane/ Pentadecane (28%/72%) + OLEA EUROPAEA FRUIT OIL Ethylhexyl Palmitate Ex 15 85% 15% Former 16 80% 20% Former 17 85% 15% Ex 18 85% 14.5% + 0.5% Cp 19 85% 14.5% + 0.5% Ex 20 70% 30% Former 21 85% + 10% water: 95% 5% Former 22 85% 15%

Conclusions 24 hours after shaking (D2 before shaking)

D2 observations before shaking Aqueous phase Oil phase Interface Hanging at the top of the wall Ex 15 crystal clear crystal clear net No Former 16 crystal clear Clear, less white marks against the wall than Ex 20 or Ex 21 net No Former 17 crystal clear Clear, small white spots on the wall Very slightly frothy Yes + Ex 18 crystal clear Clear, no white marks net Yes + Cp 19 excluding invention Very slight haze Very slight cloudiness / no white trace Foamy on 1cm Yes Ex 20 crystal clear Clear, some white marks on the wall net No Former 21 crystal clear Clear, small white spots on the wall net No Former 22 Clear with many fine droplets Clear, bubbles on the surface Slightly frothy Yes

Comparative test 19 (Cp19: comparative outside the invention) is prohibitive (slight cloudiness in the 2 phases). The other tests are acceptable (the 2 phases are clear and the interface is clear), and are therefore examples according to the invention.

An "attachment at the top of the wall" manifested by residual droplets above the biphase, is observed for tests 17, 18, 19, and 22 with essentially the oily phase, respectively: Dicaprylyl Ether, Tridecane/Pentadecane and Ethylhexyl Palmitate .

There is no adhesion observed at the top of the wall (above the bipahse) in the case of the tests with C15-19 ALKANE for oily phase.

At an identical composition, an aqueous phase/oily phase ratio of 80/20 made it possible to reduce the white traces compared to those observed for a 95/5 ratio or for a 70/30 ratio.

The addition of 0.5% olive oil made it possible to avoid the white traces observed against the wall opposite the oily phase in the test with Dicaprylyl Ether, and above all to improve the sharpness of the interface.

Conclusions after 10 shaking cycles (observations at D11 before shaking)

Protocol: 10 cycles (20°C) of 24 hours. Bottle filled to 4/5. For each cycle:
– Observe the aspect without agitation of the phases and interface
– shake the bottle 10 times
– appearance after agitation of the phases
– appearance after 24 hours of the phases and interface

Results: We note that the good results above observed on D2 are the same on D11: The sharpness of the interface of the biphase at rest remains unchanged and therefore stable, after several cycles (here 10 cycles) of use of the biphase, in the case of the examples according to the invention. Vegetable oil provides even more robust stability (beyond 15 cycles) with improved sharp interface.

Comparison of demixing rate as a function of surfactant content and influence of vegetable oil content on demixing rate

We compare the demixing speed of the biphases below at 10, 20, 30 seconds and 1 minute (visible or invisible interface) to evaluate the impact of the addition of vegetable oil on the demixing.

BIPHASE P824170 H18 P824170 H26 P824170 H27 P824170 H28 15% oily phase => 15%
C15-19 ALKANE 14.5%
C15-19 ALKANE 14.5%
C15-19 ALKANE 14%
C15-19 ALKANE Without HV 0.5% HV Olive 0.5% HV Sunflower 1% HV Sunflower 85% aqueous phase:
Phase E: Ex23 Ex24 Ex25 Ex26 Aqueous phase containing 0.104% (0.057035% MA) of Decyl glucoside in the biphase Interface invisible at 10 seconds and barely visible at 20 seconds, clearly visible at 30 seconds Interface invisible at 10 seconds and barely visible at 20 seconds, partially visible at 30 seconds Interface invisible at 10 seconds and barely visible at 20 seconds, partially visible at 30 seconds Invisible interface at 10 seconds and 30 seconds,
visible at 1 minute

Conclusion :

A slight decrease in the demixing rate is observed for the formulas of Examples 23 to 26, containing 0.057% MA of Decyl glucoside, for increasing contents of vegetable oil: the interface is visible from 20 seconds and especially at 30 seconds then the interface is sharp at 1 minute. The addition of vegetable oil (in low content, from 0.5% or 1%) makes it possible to delay the appearance of the interface by a few tens of seconds, thus reducing the rate of demixing of the biphase. Thus, thanks to the addition of vegetable oil, the biphase remains emulsified for a few additional tens of seconds, for example up to one minute after its agitation, the time to allow a homogeneous deposit of biphase on cotton then a complete removal of make-up from the face. .

Use test of a two-phase make-up remover according to the invention, under dermatological and ophthalmological control with self-assessment questionnaire by users

INCI (US/EU) Content (%) Oily phase: C15-19 ALKANE 15.00 Aqueous phase : WATER / AQUA 69.43 POTASSIUM PHOSPHATE 0.80 SALICYLIC ACID 0.15 DIPOTASSIUM PHOSPHATE 0.40 HORDEUM VULGAR STEM WATER 10.96 SODIUM BENZOATE 0.033 CITRIC ACID 0.01 PENTYLENE GLYCOL 2.00 DECYL GLUCOSIDE 0.06 SODIUM HYDROXIDE 0.04 CITRIC ACID 0.22 SODIUM CHLORIDE 0.90

Protocol:

The make-up remover biphase formula according to the invention is tested by a panel of trained experts: 53 women, regular users of make-up remover biphases and 85% of them users of waterproof and long-lasting make-up. The average age of the panel is 45 years old (minimum age: 19 years old, maximum age: 65 years old). Their type of facial skin is respectively: Normal for 12, combination oily for 13, oily for 4, combination dry for 14, dry for 9, and very dry for 1; between them. Of all the women in the panel, 28 said they had sensitive skin. Their skin type for the lips is: normal for 31, dry for 20 and very dry for 2 of them. 29 report having sensitive skin around the lips. Regarding the eyes, 21 of them have sensitive eyes, 21 wear contact lenses, and 11 have normal eyes.

The duration of the test was 4 weeks, the frequency of application once a day in accordance with the classic frequency of use of a two-phase make-up remover, and the site of application was the face. The rating scale goes from 1 to 5: 1 “totally agree”; 2 “tend to agree”, 3 “neither agree nor disagree”; 4 “somewhat disagree”; 5 “totally disagree”.

The results correspond to the number of cumulative favorable responses (“totally agree” and “tend to agree”) out of the total number of responses for each of the criteria evaluated below.

Results

Cleansing effectiveness:

D0 Timm°: the first day immediately after the first application; D28: the 28th day.

Efficacy and cosmetic qualities
(5-point scale - responses given for 1 "totally agree" and 2 "somewhat agree" D0 Tim° D28 Skin looks smoother 94% (50/53) 92% (49/53) The skin is softer 96% (51/53) 96% (51/53) The skin is more supple 91% (48/53) 91% (48/53) The skin is hydrated 96% (51/53) 96% (51/53) The skin is nourished 94% (50/53) 91% (48/53) The skin is comfortable 96% (51/53) 98% (52/53) The skin is soothed 94% (50/53) 94% (50/53) Skin tone looks fresher 91% (48/53) 92% (49/53) The texture of the skin seems refined 92% (49/53) 96% (51/53) Skin looks healthier 91% (48/53) The skin is cleansed 96% (51/53) 98% (52/53) Skin looks clean and clear 96% (51/53) 96% (51/53) The product removes impurities (dirt, dust, pollution) 100% (53/53) 98% (52/53) Subject wakes up with clean skin with no makeup residue 96% (51/53) The product removes makeup from the lips 100% (53/53) 98% (52/53) Product removes long-wearing lip makeup (if any) 100% (45/45*) 98% (44/45*) The product removes makeup from the face 98% (52/53) 98% (52/53) Product removes long-wearing face makeup (if any) 98% (44/45*) 98% (44/45*) The product effortlessly removes makeup, without excessive tugging 96% (51/53) 92% (49/53) The product removes eye makeup 96% (51/53) 96% (51/53) The product removes waterproof eye makeup (if present) 98% (44/45*) 93% (42/45*) The product leaves the eyes feeling refreshed 92% (49/53) 89% (47/53) The product is gentle on the skin 100% (53/53) 92% (49/53) Skin appears purified/detoxified 89% (47/53) 85% (45/53) Skin looks clearer 85% (45/53) 87% (46/53) The product allows the skin to breathe better 91% (48/53) 87% (46/53) Redness from cleansing appears reduced 92% (49/53) 89% (47/53) Eyelashes are nourished 79% (42/53) 87% (46/53) Lashes appear stronger/fortified 87% (46/53) Lashes are less likely to break / become brittle during makeup removal 83% (44/53) 87% (46/53)

* on the subjects concerned

Cosmetic properties:

Cosmetic
(5-point scale - responses given for 1 "totally agree" and 2 "somewhat agree" D28 The product looks nice 98% (52/53) The product has a pleasant texture 98% (52/53) The product does not leave a veil on the eyes 96% (51/53) The product feels gentle on the skin 98% (52/53) The product does not dry the skin 96% (51/53) Product feels cool/refreshing on application 91% (48/53) The product is not greasy, greasy on the skin 89% (47/53) The product does not leave the skin shiny 94% (50/53) Product does not feel sticky on the skin 98% (52/53) The product is pleasant to use 98% (52/53) The product is suitable for the subject 96% (51/53) The product is suitable for the skin type in question 98% (52/53) The product is suitable for the lips of the subject 98% (52/53) The product is suitable for the eyes of the subject 96% (51/53)

Overall opinion:

Assessment
(5-point scale - responses given for 1 "totally agree" and 2 "rather agree" D28 Frequency of application adapted to the subject (see appendix) * 98% (52/53) Overall the product is nice 98% (52/53) Subject would like to continue using the product * 94% (50/53) At the end of the test, the subject would buy the product (regardless of the price) * 81% (43/53)

Ultimately, the transparent biphasic composition according to the invention, combining C5 diol, oily phase of C15-C19 alkane, and minimum content of decylglucoside surfactant, and optionally a low content of vegetable oil, provides both makeup-removing performance perceived even on waterproof make-up, improved qualities of use, and sensory qualities highly appreciated by users.

Claims (15)

Two-phase composition consisting of an aqueous phase and a separate transparent non-silicone oily phase, characterized in that:
- the aqueous phase comprises water, at least one alkylpolyglycoside surfactant, and at least one diol comprising at least 5 carbon atoms, and
- the oily phase comprises at least 75% by weight, out of 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, alcohol ethers fatty acids, fatty acid esters and/or fatty alcohol esters, and mixtures thereof. Composition according to Claim 1, characterized in that the said alkylpolyglycoside surfactant is chosen from alkylpolyosides or alkylmonoosides, preferably non-ethoxylated, preferably the said surfactant is chosen from non-ethoxylated alkylpolyglucosides, preferably the alkylpolyglucosides whose alkyl chain comprises at least 10 carbon atoms, preferably from 10 to 16 atoms, preferably said at least one surfactant comprises, or even is, decylglucoside. Composition according to any one of the preceding claims, characterized in that the 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 0.01 and 0.05%, by weight of active material, on the total weight of the composition. Composition according to any one of the preceding claims, characterized in that the said diol is 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. Composition according to any one of the preceding claims, characterized in that the said at least one diol represents a content by weight of 1 to 10%, preferably 1 to 5%, preferably 1 to 4%, preferably 1 at 3%, preferably from 1.5 to 2.5%, by weight of active material, on the total weight of the composition. Composition according to any one of the preceding claims, characterized in that the compound(s) comprising from 15 to 30 carbon atoms in the oily phase represent(s) more than 75%, preferably more than 80%, of preferably more than 85%, preferably more than 90%, preferably more than 95%, by weight on the total weight of the oily phase. Composition according to 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. Composition according to any one of the preceding claims, characterized in that the said at least one compound of the oily phase is chosen from: alkanes and mixtures of linear and/or branched C15-28 alkanes, and/or ethers fatty alcohols and/or fatty acid esters and/or fatty alcohol esters containing from 16 to 24 carbon atoms, and mixtures thereof; preferably, said compound is chosen from alkanes and mixtures of linear and/or branched C15-C28, preferably C15-C19, alkanes. Composition according to any one of the preceding claims, characterized in that the said at least one compound comprising from 15 to 30 carbon atoms, preferably an 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, on the total weight of the two-phase composition representing 100%. Composition according to any one of the preceding claims, characterized in that the aqueous phase/oily phase weight ratio is within the range of 95/5 to 55/45, preferably within the range of 95/5 to 65/35 , preferably from 90/10 to 70/30, preferably from 90/10 to 80/20. Composition according to 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 , silicone oil on the total weight of the composition, and ideally the two-phase composition is free of any silicone oil. Composition according to any one of the preceding claims, characterized in that the oily phase also comprises at least one vegetable oil, preferably organic, preferably according to a content ranging from 0.01 to 10%, preferably from 0.1 at 7%, preferably from 0.2 to 5%, preferably from 0.3 to 3%, preferably from 0.4 to 2%, on the total weight of the two-phase composition. Composition according to Claim 12, characterized in that the vegetable oil is chosen from apricot, sweet almond, argan, arnica (macerate), sunflower, avocado, bay of bay leaf, baobab, jojoba, neem, nigella, castor, broccoli, calophylle, tamanu, camelia, safflower, coconut, copra, evening primrose, organic calophylle, prickly pear , macadamia, moringa, hazelnut, grapefruit seed, perilla, grape seed, arugula, sesame, sunflower, Dhatelo, rosehip, rosehip, Acai, sea buckthorn , nuts, tiger nut, carrot, prickly pear, bearberry oil, black cumin, pumpkin seeds, buriti evening primrose, wheat germ, pomegranate, Babassu, milk thistle , oily extract of tepescohuite, amaranth, passion fruit, rice bran, raspberry, poppy, karanja oil, kukui oil, cranberry seed oil, chia, hemp, cottonseed , d peanuts, oats, organic rosehip, Inca Inchi, blackcurrant, rapeseed, cucumber, copra, squash, cranberries, fenugreek, mustard seeds, maritime pine seeds, organic pomegranate, mango, soy. Use of at least one vegetable oil chosen from those listed in Claim 13, in a two-phase composition as defined according to any one of Claims 1 to 11 for, after agitation of the said composition, slowing down the rate of demixing of the 2 phases of the composition, and/or improve the sharpness of the interface between the 2 phases and/or prolong the sharpness of the interface at rest of the biphase after at least 3 cycles of use of the biphase, characterized in that the content of vegetable oil is in the range of 0.01 to 10%, preferably 0.1 to 7%, preferably 0.2 to 5%, preferably 0.3 to 3%, preferably 0, 4 to 2%, on the total weight of the two-phase composition. Cosmetic process for removing make-up, for cleaning and/or caring for the skin, the lips and/or the eyes, the body or the hair, characterized in that one applies to the skin, the lips and/or the eyes, or the hair, a cosmetic composition according to any one of claims 1 to 13.