EP2313055A1

EP2313055A1 - Anhydrous antiperspirant composition comprising a volatile linear c9-c17 alkane; aerosol device

Info

Publication number: EP2313055A1
Application number: EP09779882A
Authority: EP
Inventors: Laurence Sebillotte-Arnaud; Jalila Lafdil
Original assignee: LOreal SA
Current assignee: LOreal SA
Priority date: 2008-07-10
Filing date: 2009-06-23
Publication date: 2011-04-27
Also published as: WO2010003814A1; BRPI0910350A2

Abstract

The present invention relates to an antiperspirant composition, characterized in that it comprises, in a cosmetically acceptable anhydrous liquid vehicle: (a)at least one antiperspirant active principle; (b) at least one volatile linear C₉-C₁₇ alkane; (c)at least one propellant. The invention also relates to an aerosol device composed of: (A) a container comprising a composition composed, on the one hand, of an anhydrous liquid phase (or dispensable) comprising at least one antiperspirant active principle and at least one volatile linear C₉-C₁₇ alkane, and (B) at least one propellant and of a means for dispensing the said aerosol composition. The invention also relates to a method for the treatment of human perspiration and the human body odours resulting therefrom and in particular axillary odours using this composition or device.

Description

ANHYDROUS ANTIPERSPIRANT COMPOSITION COMPRISING A VOLATILE LINEAR C₉-Ci₇ ALKANE ; AEROSOL DEVICE

The present invention relates to an antiperspirant composition, characterized in that it comprises, in a cosmetically acceptable anhydrous liquid vehicle:

(a) at least one antiperspirant active principle;

(b) at least one volatile linear C₉-Ci₇ alkane or a mixture of volatile linear C9-C17 alkanes; and

(c) at least one propellant. The invention also relates to an aerosol device composed of:

(A) a container comprising a composition composed, on the one hand, of an anhydrous liquid phase (or dispensable) comprising at least one antiperspirant active principle .and at least one volatile linear C₉-C17 alkane or a mixture of volatile linear C₉-C17 alkanes, and

(B) at least one propellant and of a means for dispensing the said aerosol composition. The invention also relates to a method for the treatment of human perspiration and the human body odours and in particular axillary odours resulting therefrom using this composition.

In the cosmetic field, it is well known to use, in topical application, antiperspirant products comprising active substances of antiperspirant type to reduce the flow of sweat, indeed even to reduce body odours.

Antiperspirant substances have the effect of limiting the flow of sweat. They are generally composed of aluminium and/or zirconium salts.

The most widely used anhydrous aerosols in the field of antiperspirants mainly comprise a solid antiperspirant active principle suspended in an emollient oil by virtue of a modified clay. The phase proportion of dispensable to propellant generally lies within ratios of concentrations, expressed as percentage by weight, of between 10/90 and 30/70.

"Dispensable" is understood to mean the product which is introduced into the aerosol device, to which a propellant gas is added in order to place it under pressure .

The qualities desired for an anhydrous antiperspirant composition in the aerosol form are:

- freshness and softness on application,

- no greasy feeling,

- ease of use due to a longer settling time.

The anhydrous antiperspirant aerosols known in the prior art generally comprise suspending agents of modified clay or silica type. However, the separation by settling of the antiperspirant active principle is often rapid and can result in nonhomogeneous deliveries of product. Moreover, the addition of these suspending agents, such as silicas, can cause blockage of the nozzle in the aerosol device. Clays, such as bentonites, can, for their part, introduce a greasy feel.

Furthermore, anhydrous antiperspirant aerosols generally comprise volatile emollient silicone oils which exhibit the advantage of having a good dry feel. However, the separation by settling of the antiperspirant active principle obtained in the presence of these volatile silicones often still remains excessively rapid and can result in deliveries of nonhomogeneous product.

The need thus remains to find novel anhydrous antiperspirant aerosol formulations having a rate of separation by settling of the antiperspirant active principle which can be substantially slowed down while simultaneously having good effectiveness and good cosmetic properties.

Three examples of antiperspirant compositions in the aerosol form are known from the published patent applications DE102008012457 and DE102008017031 :

After much research directed at this issue, the Applicant Company has now discovered, unexpectedly and surprisingly, that, by partially or completely replacing the volatile silicones with at least one volatile linear C9-C17 alkane, anhydrous antiperspirant aerosol compositions are obtained in which the active principle settling time is substantially longer. The compositions in accordance with the invention simultaneously exhibit good effectiveness and good cosmetic properties.

This discovery forms the basis of the present invention.

A subject-matter of the invention is thus an antiperspirant composition, characterized in that it comprises, in a cosmetically acceptable anhydrous liquid vehicle: (a) at least one antiperspirant active principle;

(b) at least one volatile linear C9-C17 alkane or a mixture of volatile linear C9-C17 alkanes; and

(c) at least one propellant; with the proviso that the composition is different from the following formulations, in which the amounts of the ingredients are expressed as percentage by weight, with respect to the total weight of the composition:

The invention also relates to an aerosol device composed of:

(A) a container comprising a composition composed, on the one hand, of an anhydrous liquid phase (or dispensable) comprising at least one antiperspirant active principle and at least one volatile linear Cg-Ci₇ alkane or a mixture of volatile linear Cg-Ci₇ alkanes, and

(B) at least one propellant and of a means for dispensing the said aerosol composition; with the proviso that the composition formed by the said dispensable and the propellant is different from the above formulations A, B and C.

A second subject-matter of the present invention is also a method consisting in using such a composition to prevent or limit the flow of sweat and thus to limit the body odours resulting therefrom.

"Anhydrous" is understood to mean, within the meaning of the invention, a composition having a content of free or added water of less than 3% by weight and preferably having a content of added water of less than 1% by weight, with respect to the total weight of the composition. The volatile linear alkanes in accordance with the invention comprise from 9 to 17 carbon atoms, in particular from 10 to 15 carbon atoms and more particularly from 11 to 13 carbon atoms.

The volatile linear alkanes in accordance with the invention can advantageously be of vegetable origin.

Such alkanes can be obtained, directly or in several stages, from a vegetable raw material, such as an oil, a butter, a wax, and the like.

Mention may be made, as examples of volatile linear alkanes suitable for the invention, of those described in the patent application from Cognis WO 2007/068371, DE102008012457 and DE102008017031.

These alkanes are obtained from fatty alcohols, themselves obtained from coconut or palm oil. Mention may be made, as examples of volatile linear alkanes suitable for the invention, of n-nonane (Cg) , n-decane (Cio) , n-undecane (Cn) , n-dodecane (C12) , n-tridecane (C13) , n-tetradecane (Ci₄) , n-pentadecane (Ci₅) , n-hexadecane (Ciε) and n-heptadecane (Ci₇) , and their mixtures.

According to a particularly preferred form, use will be made of a mixture of undecane (Cn) and tridecane (C13) . More preferentially, the said mixture will comprise from 50 to 90% by weight of undecane and from 10 to 50% by weight of tridecane, with respect to the total weight of the mixture.

The volatile linear alkane or the mixture of volatile linear alkanes of the invention are preferably present in a content ranging from 10% to 95% by weight, with respect to the total weight of the dispensable of the composition, and more preferably ranging from 30% to 95% by weight.

The antiperspirant active principles in accordance with the invention are preferably chosen from aluminium hydrohalides ; aluminium zirconium hydrohalides, complexes of zirconium hydroxychloride and of aluminium hydroxychloride with an amino acid, such as those described in Patent US-3 792 068, commonly known under the name "ZAG complexes". Such complexes are generally known under the name ZAG (when the amino acid is glycine) . The ZAG complexes ordinarily exhibit an Al/Zr quotient ranging from approximately 1.67 to 12.5 and a metal/Cl quotient ranging from approximately 0.73 to 1.93. Mention may be made, among these products, of aluminium zirconium octachlorohydrex GLY, aluminium zirconium pentachlorohydrex GLY, aluminium zirconium tetrachlorohydrate GLY and aluminium zirconium trichlorohydrate GLY. Mention may in particular be made, among the aluminium salts, of aluminium chlorohydrate in the activated or non-activated form, aluminium chlorohydrex, the aluminium chlorohydrex polyethylene glycol complex, the aluminium chlorohydrex propylene glycol complex, aluminium dichlorohydrate, the aluminium dichlorohydrex polyethylene glycol complex, the aluminium dichlorohydrex propylene glycol complex, aluminium sesquichlorohydrate, the aluminium sesquichlorohydrex polyethylene glycol complex, the aluminium sesquichlorohydrex propylene glycol complex or aluminium sulphate buffered with sodium aluminium lactate .

Mention may in particular be made, among aluminium zirconium salts, of aluminium zirconium octachloro- hydrate, aluminium zirconium pentachlorohydrate, aluminium zirconium tetrachlorohydrate or aluminium zirconium trichlorohydrate. The complexes of zirconium hydroxychloride and of aluminium hydroxychloride with an amino acid are generally known under the name ZAG (when the amino acid is glycine) . Mention may be made, among these products, of the aluminium zirconium octachlorohydrex glycine, aluminium zirconium pentachlorohydrex glycine, aluminium zirconium tetrachlorohydrex glycine and aluminium zirconium trichlorohydrex glycine complexes.

The antiperspirant active principles present in the compositions of the invention are preferably chosen from aluminium and/or zirconium salts; or complexes of zirconium hydroxychloride and of aluminium hydroxychloride with an amino acid, such as those described in Patent US-3 792 068, commonly known under the name "ZAG complexes". Such complexes are generally known under the name ZAG (when the amino acid is Glycine) . The ZAG complexes ordinarily exhibit an Al/Zr quotient ranging from approximately 1.67 to 12.5 and a metal/Cl quotient ranging from approximately 0.73 to 1.93. Mention may be made, among these products, of aluminium zirconium octachlorohydrex GLY, aluminium zirconium pentachlorohydrex GLY, aluminium zirconium tetrachlorohydrate GLY and aluminium zirconium trichlorohydrate GLY.

Mention may be made, among the aluminium salts, of aluminium chlorohydrate, aluminium chlorohydrex, aluminium chlorohydrex PEG, aluminium chlorohydrex PG, aluminium dichlorohydrate, aluminium dichlorohydrex PEG, aluminium dichlorohydrex PG, aluminium sesquichlorohydrate, aluminium sesquichlorohydrex PEG, aluminium sesquichlorohydrex PG, alum salts, aluminium sulphate, in particular buffered by sodium aluminium lactate, aluminium zirconium octachlorohydrate, aluminium zirconium pentachlorohydrate, aluminium zirconium tetrachlorohydrate, aluminium zirconium trichlorohydrate and more particularly the aluminium hydroxychloride sold by Reheis under the name Reach 301 or by Guilini Chemie under the name Aloxicoll PF 40.

Aluminium zirconium salts are, for example, that sold by Reheis under the name Reach AZP-908-SUF.

Use will more particularly be made of the aluminium salts and more particularly still of activated or nonactivated aluminium hydroxychloride .

The antiperspirant active principles can be present in the composition according to the invention in a proportion of 0.1 to 40% by weight, with respect to the dispensable, and preferably in a proportion of 5 to 35% by weight, with respect to the dispensable.

The propellant can be chosen from dimethyl ether; volatile hydrocarbons, such as n-butane, propane, isopropane, n-butane, isobutane, pentane and isopentane, and their mixtures; or volatile fluorinated hydrocarbons, such as 1, 1-difluoroethane and 1,1,1- trifluoro-2-fluoroethane .

Use may also be made, as propellant, of carbon dioxide gas, nitrous oxide, nitrogen or compressed air.

The composition comprising the antiperspirant active principle or principles and the propellant or propellants can occur in the same compartment or in different compartments in the aerosol container. According to the invention, the pressurized concentration of propellant generally varies from 5 to 90% by weight and more preferably from 15 to 60% by weight, with respect to the total weight of the pressurized composition. The dispensable/propellant ratio preferably varies from 10/90 to 50/50 and more preferably from 15/85 to 30/70.

The cosmetic composition according to the invention can thus be provided in the form of a lotion, cream or fluid gel dispensed in the aerosol spray and can comprise, in this respect, the ingredients generally used in products of this type and which are well known to a person skilled in the art.

The dispensing means, which forms a part of the aerosol device, is generally composed of a dispensing valve controlled by a dispensing head, itself comprising a nozzle via which the aerosol composition is vaporized.

The container comprising the pressurized composition can be opaque or transparent. It can be made of glass, of polymer or of metal, optionally covered with a layer of protective lacquer.

In addition to antiperspirant active principle or principles, the composition according to the invention can also comprise at least one additional deodorant active principle.

Mention may be made, among additional deodorant active principles, for example of: zinc pyrrolidonecarboxylate (more commonly known as zinc pidolate) , zinc salicylate, zinc sulphate, zinc chloride, zinc lactate, zinc gluconate and zinc phenolsulphonate; 2,4,4' -trichloro-2' -hydroxydiphenyl ether (triclosan) , 2, 4-dichloro-2' -hydroxydiphenyl ether, 3' , 4' , 5' -trichlorosalicylanilide, l-(3',4'- dichlorophenyl) -3- (4 ' -chlorophenyl) urea ( triclocarban) or 3, 7, ll-trimethyldodeca-2, 5, 10-trienol (farnesol); quaternary ammonium salts, such as cetyltrimethylammonium salts or cetylpyridinium salts; chlorhexidine and its salts; diglycerol monocaprate, diglycerol monolaurate or glycerol monolaurate; or polyhexamethylene biguanide salts.

The preferred active principles are 2,4,4'- trichloro-2 ' -hydroxydiphenyl ether (triclosan); polyhexamethylene biguanide salts (known under the name of polyaminopropyl biguanide salts), for example the product Cosmocil CQTM (Zeneca) ; or 3, 7, ll- trimethyldodeca-2, 5, 10-trienol (farnesol) .

The cosmetically acceptable anhydrous liquid vehicle comprises an oily phase which can either be composed solely of the linear Cg-Ci₇ alkane or alkanes as defined above or else can comprise, in addition to the said alkanes, one or more volatile or nonvolatile silicone, hydrocarbon or fluorinated oils. The oily phase of the compositions according to the invention will preferably represent from 60% to 95% by weight, with respect to the total weight of the dispensable .

The linear Cg-Ci₇ alkane or alkanes preferably represent from 60 to 100% by weight, with respect to the amount of the oily phase.

The volatile silicones are defined in a known way as compounds which are volatile at ambient temperature. Mention may be made, among these compounds, of volatile cyclic and linear silicones of dimethylsiloxane type, the chains of which comprise from 3 to 9 silicone residues. Preferably, the cyclomethicones D4, D5 or D6 are chosen. The additional volatile hydrocarbon oils can be chosen from in particular branched Cs-Ci6 alkanes, such as Cs-Ci6 isoalkanes (also known as isoparaffins) , isododecane, isodecane, isohexadecane and, for example, the oils sold under the Isopar or Permethyl trade names, branched Cs-Ci6 esters, such as isohexyl neopentanoate, and their mixtures; use is preferably made of isododecane.

The nonvolatile silicones are defined in a known way as compounds with a low vapour pressure at ambient temperature. These compounds include: polyalkylsiloxanes, in particular linear polyalkylsiloxanes, such as, for example, linear polydimethylsiloxanes or dimethicones, sold by Dow Corning under the name of "Dow Corning 245 Fluid"; cyclopolydimethylsiloxanes (cyclomethicones) ; polydimethylsiloxanes comprising pendent alkyl, alkoxy or phenyl groups or alkyl, alkoxy or phenyl groups at the end of the silicone chain, which groups have from 2 to 24 carbon atoms; or phenylated silicones, such as phenyl trimethicones, phenyl dimethicones, phenyl-

(trimethylsiloxy) diphenylsiloxanes, diphenyl dimethicones, diphenyl (methyldiphenyl) trisiloxanes,

(2-phenylethyl) trimethylsiloxysilicates or polymethyl- phenylsiloxanes . The nonvolatile fluorinated oils can be chosen from those which partially comprise hydrocarbon and/or silicone, such as those described in the document JP-A-2-295912.

The nonvolatile hydrocarbon oils can be of mineral, synthetic or animal origin. They can be chosen from liquid paraffins, such as liquid petrolatum, perhydrosqualene, polydecenes, isohexadecane, isododecane or hydrogenated polyisobutene (or hydrogenated isoparaffin) , such as Parleam oil; or fatty esters, preferably those obtained from an alcohol comprising a linear or branched chain having from 1 to 17 carbon atoms and from a fatty acid comprising a linear or branched chain having from 3 to 18 and preferably from 12 to 17 carbon atoms. Advantageously, the said ester is a saturated ester which does not include either an ether group or a hydroxyl group (the total amount of carbon atoms in the ester can vary from 12 to 50 and preferably from 20 to 50) . Mention may be made, as fatty esters, for example, of 2-ethylhexyl caprate/caprylate (or octyl caprate/caprylate) , ethyl laurate, butyl laurate, hexyl laurate, isohexyl laurate, isopropyl laurate, methyl myristate, ethyl myristate, butyl myristate, isobutyl myristate, isopropyl myristate, 2-octyldodecyl myristate, 2-ethylhexyl monococoate (or octyl monococoate) , methyl palmitate, ethyl palmitate, isopropyl palmitate, isobutyl palmitate, 2-ethylhexyl palmitate (or octyl palmitate) , butyl stearate, isopropyl stearate, isobutyl stearate, isocetyl stearate, isostearyl isostearate, isopropyl isostearate, 2-ethylhexyl stearate (or octyl stearate) , 2-ethylhexyl pelargonate (or octyl pelargonate) , 2-ethylhexyl hydroxystearate (or octyl hydroxystearate) , decyl oleate, diisopropyl adipate, di (2-ethylhexyl) adipate (or dioctyl adipate) , diisocetyl adipate, 2-ethylhexyl succinate (or octyl succinate) , diisopropyl sebacate, 2-ethylhexyl malate (or octyl malate) , pentaerythritol caprate/caprylate, pentaerythritol tetraisostearate, 2-ethylhexyl hexanoate (or octyl hexanoate) , octyldodecyl octanoate, isodecyl neopentanoate, isostearyl neopentanoate, cetearyl isononanoate, isodecyl isononanoate, isononyl isononanoate, isotridecyl isononanoate, lauryl lactate, myristyl lactate, cetyl lactate, myristyl propionate, 2-ethylhexyl 2-ethylhexanoate (or octyl 2-ethylhexanoate) , 2-ethylhexyl octanoate (or octyl octanoate) , and their mixtures, C12-C15 fatty alcohol benzoates (Finsolv TN from Finetex) ; isopropyl lauroylsarcosinate (Eldew SL 205 from Unipex) or dicaprylyl carbonate (Cetiol CC from Cognis) .

The nonvolatile hydrocarbon oils can also be dialkyl ethers, such as dicaprylyl ether (Cetiol OE from Cognis) .

The nonvolatile hydrocarbon oils can be oils of vegetable origin, such as, for example, sweet almond oil, avocado oil, castor oil, coriander oil, olive oil, jojoba oil, sesame oil, groundnut oil, grape seed oil, rapeseed oil, coconut oil, hazelnut oil, shea butter, palm oil, apricot kernel oil, calophyllum oil, rice bran oil, maize oil, wheat germ oil, soybean oil, sunflower oil, evening primrose oil, safflower oil, passionflower oil, rye oil or triglycerides of caprylic/capric acids, such as those sold by Stearineries Dubois or those sold under the names Miglyol 810, 812 and 818 by Dynamit Nobel.

The nonvolatile hydrocarbon oils can also be chosen from fatty acids, fatty alcohols, such as lauryl, cetyl, myristyl, stearyl, palmityl or oleyl alcohol, and 2-octyldodecanol .

In order to prevent or reduce the phenomenon of formation of cake or of sedimentation of the astringent salt in the aerosol container, use is preferably made of a suspending agent which is preferably chosen form hydrophobic modified montmorillonite clays, such as hydrophobic modified bentonites or hectorites. Mention may be made, for example, of the product Stearalkonium Bentonite (CTFA name) (reaction product of bentonite and of the quaternary ammonium stearalkonium chloride) , such as the commercial product sold under the name Tixogel MP 250 by Sud-Chemie Rheologicals, United Catalysts, Inc., or the product Disteardimonium Hectorite (CTFA name) (reaction product of hectorite and distearyldimonium chloride) , sold under the name Bentone 38V by Elementis Specialties.

The suspending agents are preferably present in amounts ranging from 0.1 to 5% by weight and more preferably from 0.2 to 3% by weight, with respect to the total weight of the composition.

The compositions according to the invention can additionally comprise at least one filler.

Mention may be made, among the fillers which can be used according to the invention, of organic or inorganic powders.

"Filler" is understood to mean, in the present patent application, any solid which is insoluble in the medium at ambient temperature (25°C) . Mention may be made, as organic powders which can be used in the composition of the invention, for example, of polyamide particles and in particular those sold under the names Orgasol by Atochem; polyethylene powders; microspheres based on acrylic copolymers, such as those made of ethylene glycol dimethacrylate/lauryl methacrylate copolymer sold by Dow Corning under the name Polytrap; poly (methyl methacrylate) microspheres sold under the name Microsphere M-IOO by Matsumoto or under the name Covabead LH85 by Wackherr; powders formed of ethylene/acrylate copolymer, such as those sold under the name Flobeads by Sumitomo Seika Chemicals; expanded powders, such as hollow microspheres and in particular the microspheres formed from a terpolymer of vinylidene chloride, of acrylonitrile and of methacrylate sold under the name Expancel by Kemanord Plast under the references 551 DE 12 (particle size of approximately 12 μm and density 40 kg/m³) , 551 DE 20 (particle size of approximately 30 μm and density 65 kg/m³) or 551 DE 50 (particle size of approximately 40 μm) , or the microspheres sold under the name Micropearl F 80 ED by Matsumoto; powders formed from natural organic materials, such as powders formed from starch, in particular from crosslinked or noncrosslinked maize, wheat or rice starches, such as the powders formed from starch crosslinked by octenylsuccinic anhydride sold under the name Dry-Flo by National Starch; silicone resin microbeads, such as those sold under the name Tospearl by Toshiba Silicone, in particular Tospearl 240; or powders formed from amino acids, such as the lauroyllysine powder sold under the name Amihope LL-Il by Ajinomoto; wax microdispersion particles, which preferably have mean sizes of less than 1 μm and in particular ranging from 0.02 μm to 1 μm and which are composed essentially of a wax or of a mixture of waxes, such as the products sold under the name Aquacer by Byk Cera and in particular: Aquacer 520 (mixture of synthetic and natural waxes), Aquacer 514 or 513 (polyethylene wax) or Aquacer 511 (polymer wax) , or such as the products sold under the name Jonwax 120 by Johnson Polymer (mixture of polyethylene and paraffin waxes) and under the name Ceraflour 961 by Byk Cera (micronized modified polyethylene wax) ; and their mixtures. The organic powder or powders can be present, for example, in an amount

The cosmetic composition according to the invention can additionally comprise cosmetic adjuvants chosen from softeners, antioxidants, opacifiers, stabilizers, antifoaming agents, moisturizing agents, vitamins, fragrances, preservatives, polymers, lipophilic thickening agents or any other ingredient commonly used in cosmetics in this type of application.

Of course, a person skilled in the art will take care to choose this or these optional additional compounds so that the advantageous properties intrinsically attached to the cosmetic composition in accordance with the invention are not, or not substantially, detrimentally affected by the envisaged addition or additions.

The lipophilic thickeners can be chosen from modified clays, such as, for example, hectorite modified by distearyldimethylammonium chloride (CTFA name: Disteardimonium Hectorite) , such as the product sold under the trade name Bentone Gel MIO by NL Industries or the product "Bentone 38 CE" sold by Rheox; magnesium aluminium silicate, in particular the product sold under the trade name Veegum Ultra by RT Vanderbilt Inc.; or Quaternium-18 Bentonite, such as the product sold under the trade name Tixogel MP 250 by Rockwood Additives.

The amounts of these various constituents which can be present in the cosmetic composition according to the invention are those conventionally used in anhydrous antiperspirant aerosols.

Another subject-matter of the present invention is an aerosol device composed of a container comprising an aerosol composition composed of an anhydrous liquid phase (or dispensable) comprising (a) at least one antiperspirant active principle, (b) at least one volatile linear Cg-Ci₇ alkane and (c) at least one propellant, as are defined above, and of a means for dispensing the said aerosol composition.

Another subject-matter of the present invention is a cosmetic method for treating human perspiration and the human body odours, in particular axillary odours, resulting therefrom which consists in applying, to the axillary surface, an effective amount of a composition as defined above.

Another subject-matter of the invention is the use of a volatile linear C9-C17 alkane as defined above in an anhydrous antiperspirant composition packaged in an aerosol as agent which makes it possible to slow down the rate of settling of the antiperspirant active principle .

Concrete but in no way limiting examples illustrating the invention will now be given. Examples

Two formulation examples 1 and 2 in the form of aerosols with 85% of propellant and 15% of dispensable were produced. The amounts of the various ingredients present are shown as percentages by weight.

Procedure

The whole of phase A (fatty phase) is weighed out in a beaker and mixing is carried out under an Ultra- Turrax at speed 2 for 15 min. Phase B (the thickener) is added little by little and the mixture is allowed to thicken, still under Ultra-Turrax stirring (speed 2), for 15 min. Finally, phase C (active principle) is added. Dispersing is carried out for 15 min. Subsequently, each of the formulations 1 and 2 is packaged in an aerosol container comprising 85% of isobutane (propellant) and 15% of dispensable.

Protocol for measuring the rate of settling

The measurment is carried out after pressurization . A demarcation line is traced, on a glass aerosol, at the level of the liquefied gas (at the top) and then a second demarcation line is traced 1 cm below. The aerosol is agitated manually for 10 seconds (time necessary to disperse the cake formed at the bottom of the aerosol) . The aerosol is immediately placed on a horizontal surface and the stopwatch is started as soon as the dispensable is positioned at the level of the top line. The stopwatch is halted as soon as the dispensable reaches the second line (1 cm below) . The time (in seconds) necessary in order for the dispensable to travel this distance is then determined. It is accepted that the rate of settling is within the standards when it is greater than or equal to 20 s.

Claims

1. Antiperspirant composition, characterized in that it comprises, in a cosmetically acceptable anhydrous liquid vehicle: (a) at least one antiperspirant active principle;

(b) at least one volatile linear Cg-Ci₇ alkane or a mixture of volatile linear Cg-Ci₇ alkanes; and

2. Composition according to Claim 1, where the said volatile linear alkane or alkanes exhibit from 10 to 15 carbon atoms and more particularly from 11 to 13 carbon atoms.

3. Composition according to Claim 1 or 2, where the said volatile linear alkane or alkanes are of vegetable origin.

4. Composition according to any one of Claims 1 to 3, in which the mixture of volatile linear Cg-Ci₇ alkanes is a mixture of undecane (Cn) and tridecane (C₁₃) .

5. Composition according to Claim 4, where the mixture of undecane (Cn) and tridecane (C₁3) comprises from 50 to 90% by weight of undecane and from 10 to 50% by weight of tridecane, with respect to the total weight of the mixture.

6. Composition according to any one of Claims 1 to

5, where the volatile linear alkane or the volatile linear alkanes are present in a content ranging from

10% to 95% by weight, with respect to the total weight of the dispensable of the composition, and more preferably ranging from 30% to 95% by weight, with respect to the total weight of the dispensable.

7. Composition according to any one of Claims 1 to

6, where the antiperspirant active principle or principles are chosen from aluminium and/or zirconium salts; the complexes of zirconium hydroxychloride and of aluminium hydroxychloride with an amino acid.

8. Composition according to any one of Claims 1 to

7, where the antiperspirant active principle or principles are present in the composition according to the invention in a proportion of 0.1 to 40% by weight, with respect to the dispensable, and preferably in a proportion of 5 to 35% by weight.

9. Composition according to any one of Claims 1 to

8, furthermore comprising an additional deodorant active principle.

10. Composition according to any one of Claims 1 to 9, where the anhydrous liquid vehicle comprises an oily phase composed solely of the volatile linear Cg-Ci₇ alkane or alkanes as defined in Claims 1 to 4 or else comprising, in addition to the said alkanes, one or more volatile or nonvolatile silicone, hydrocarbon or fluorinated oils.

11. Composition according to Claim 10, where the oily phase of the compositions according to the invention will preferably represent from 60% to 95% by weight, with respect to the total weight of the dispensable .

12. Composition according to Claim 10 or 11, where the volatile linear C9-C17 alkane or alkanes preferably represent from 60 to 100% by weight, with respect to the amount of the oily phase.

13. Aerosol device composed of:

(A) a container comprising a composition composed, on the one hand, of an anhydrous liquid phase (or dispensable) comprising at least one antiperspirant active principle, at least one volatile linear C9-C17 alkane or a mixture of volatile linear C9-C17 alkanes, as defined in the preceding claims, and

(B) at least one propellant and of a means for dispensing the said aerosol composition; with the proviso that the composition formed by the said dispensable and the propellant is different from the formulations A, B and C as defined in Claim 1.

14. Use of at least one volatile linear C9-C17 alkane or a mixture of volatile linear C9-C17 alkanes as defined in Claims 1 to 5 in an anhydrous antiperspirant composition packaged in an aerosol as agent which makes it possible to slow down the rate of settling of the antiperspirant active principle.

15. Method for the treatment of human perspiration and the human body odours resulting therefrom, in particular axillary odours, which consists in applying, to the surface of the skin to be treated, a composition as defined in any one of Claims 1 to 12.