WO2011073345A2

WO2011073345A2 - Use of one or more pressure-sensitive adhesive compounds as agent for the treatment of sweating in humans

Info

Publication number: WO2011073345A2
Application number: PCT/EP2010/069969
Authority: WO
Inventors: Henri Samain; Jean-François Grollier
Original assignee: L'oreal
Priority date: 2009-12-17
Filing date: 2010-12-16
Publication date: 2011-06-23
Also published as: FR2954150B1; FR2954150A1; WO2011073345A3

Abstract

The present invention relates to the use of one or more pressure-sensitive adhesive compounds as agents for the cosmetic treatment of sweating in humans. Moreover, the present invention relates to the use of a cosmetic composition comprising, in a cosmetically acceptable medium, one or more pressure-sensitive adhesive compounds for the treatment of sweating in humans. The invention also relates to a method of cosmetic treatment of sweating in humans in two stages involving the use of one or more pressure-sensitive adhesive compounds.

Description

Use of one or more pressure-sensitive adhesive compounds as agent for the treatment of sweating in humans

The present invention relates to the use o f one or more pressure-sensitive adhesive compounds as agents for the cosmetic treatment of sweating in humans. The present invention also relates to the use of a cosmetic composition comprising, in a cosmetically acceptable medium, one or more pressure-sensitive adhesive compounds for the treatment of sweating in humans. The invention also relates to a method of cosmetic treatment of sweating in humans invo lving the use of one or more pressure-sensitive adhesive compounds.

The armpits as well as certain other parts of the body are generally the site o f several forms o f discomfort, which may arise directly or indirectly from phenomena of sweating. These phenomena often lead to unpleasant and embarrassing sensations, which are mainly due to the presence o f the sweat resulting from sweating, which can, in certain cases, make the skin moist and the clothing damp , notably at the armpits or on the back, leaving visible marks. Moreover, the presence o f sweat generally causes release of body odours, which are unpleasant mo st of the time. Finally, when it evaporates, sweat may also leave salts and/or proteins on the surface of the skin, thus creating whitish marks on clothing. Such discomfort can even occur with moderate sweating.

Thus, in the cosmetic field, the use, in topical application, o f antiperspirants containing substances that have the effect of limiting or even suppressing the flow of sweat, in order to combat the problems mentioned above, is well known. These products are generally available in roll-on, stick, aerosol or spray form.

The antiperspirants are generally constituted o f aluminium salts, such as aluminium chloride and aluminium hydroxyhalides, or complexes o f aluminium and zirconium. These substances are able to reduce the flow o f sweat by forming a plug in the sweat duct. However, use o f these substances at high concentrations, notably at a content in the range from 1 5 to 20 wt. %, with a view to obtaining good antiperspirant efficacy, mo st often has the drawback that it leads to difficulties in formulation.

Moreover, it has been found that the antiperspirant efficacy o f these substances is limited, which means that they have to be applied repeatedly on the skin in order to obtain a satisfactory antiperspirant effect. However, for certain users, repeated applications o f these substances has the drawback that it leads to irritation of the skin.

Furthermore, another drawback connected with the use o f these aluminium salts is that the antiperspirant effect conferred by such substances generally tends to disappear, notably on washing or if there is considerable sweating.

Finally, these antiperspirants may leave traces when they are applied on the skin, causing clothing to be marked.

As an alternative, it has also been proposed to develop a method consisting of employing botulin for imparting a satisfactory antiperspirant effect. However, the need to inj ect said toxin during each use greatly limits the application o f this method.

In order to overcome all o f the drawbacks mentioned above, it was proposed to look for other active substances that are effective, well tolerated by the skin and easy to formulate, in order to replace, who lly or partly, aluminium salts and/or complexes o f aluminium and zirconium.

In fact, the flow o f sweat can be restricted by partially obstructing the sweat ducts through formation o f a plug in the sweat duct, but also by forming a sweat-retaining film on the surface o f the skin. Thus, numerous approaches, which aim to cover the surface o f the skin with a film, have been developed for limiting the flow o f sweat.

As examples, patent applications WO93/241 05 and US5 ,508 ,024 describe antiperspirant compositions essentially comprising, in a cosmetically acceptable medium, at least one nontoxic polymer, water-inso luble, which is capable o f forming an antiperspirant occlusive film on the skin. In particular, the water- inso luble polymers used in said compositions are so lubilized or dispersed in a medium based on alcoho ls, notably aliphatic alcoho ls having short alkyl chains, and form a flexible occlusive film on the skin.

Patent application US 2003/0194387 describes an antiperspirant composition intended for topical application comprising, in a cosmetically acceptable medium, at least one antiperspirant active substance, which is notably selected from aluminium salts, and at least one non-toxic, water-inso luble po lyester, which is capable o f forming an occlusive film on the skin. The film thus formed, fo llowing application o f the polyester on the skin, is intended to reinforce the efficacy of the aluminium salts and make it possible to formulate compositions having low contents of aluminium salts.

Similarly, patent application US 6,387,356 describes a composition comprising, in a medium comprising alcoho lic so lvents, at least one cellulo se ester so luble in an aqueous-alcoho lic medium, capable o f forming a thin film on the surface of the skin and at least one antiperspirant substance, which is generally selected from the aluminium salts.

Similarly, patent application DE 2947060 describes a composition, in particular a composition packaged in an aerosol, having at least one acrylic po lymer capable of forming a film on the skin and at least one antiperspirant substance, which can notably be aluminium salts.

Moreover, patent application WO 9527473 describes the use o f polymers containing quaternized amine groups enabling films to be formed on the skin.

However, these occlusive film-forming polymers do not enable an entirely satisfactory antiperspirant efficacy to be obtained, and they also give rise to problems in formulation. In particular, the antiperspirant effects conferred by such compositions are still not sufficiently long-lasting. Another approach invo lved the use of compositions comprising fats that are capable of forming an occlusive layer on the skin. In particular, international patent application WO 00/ 13653 describes a composition having the consistency of a gel comprising (a) at least one vo latile or non-vo latile organosilicone compound and (b) at least one gelling agent comprising a non-vo latile organosilicone compound having an aliphatic hydrocarbon chain.

Similarly, patent application WO 96/27364 describes a composition intended to be applied on the skin comprising an anhydrous vehicle that comprises cosmetic active substances for the skin and which comprises from 5 to 30 wt. % of a wax having a high melting point, from 5 to 30 wt. % of monoglyceride, from 5 to 60 wt. % of petroleum j elly and from 0. 1 to 30 wt.% of fatty alcoho ls.

However, the film that forms fo llowing application o f these compositions on the skin has a tendency to break down easily, which means that the required antiperspirant effects are not entirely satisfactory.

In order to remedy these drawbacks, a method was developed consisting o f using a polymer film that is able to absorb sweat. In particular, patent application US 9387538 describes the use of a polymer such as a cellulo se ester, which forms a sweat-absorbing film on the skin.

However, the film formed on the skin is not entirely satisfactory, as the amount of water to be absorbed is generally greater than the amount of water that such compounds can absorb.

Moreover, international patent application WO2001 /054658 also proposes the use o f anhydrous, non-adhesive antiperspirant compositions comprising at least one cyanoacrylate monomer that is reactive with water, an anhydrous medium, a polymerization inhibitor and an active substance selected from a deodorant, an antiperspirant, a perfume substance or a mixture of these substances. The cyanoacrylate monomers used in said compositions polymerize anionically directly on the surface of the skin in the presence of a nucleophilic agent, such as hydroxide ions (OH ) contained in water, to form a water-resistant polymer film. In other words, the cyanoacrylate monomers react with sweat to form in situ, by anionic polymerization, a film on the skin that makes it possible to block the sweat ducts.

However, these occlusive film-forming polymers do not provide entirely satisfactory antiperspirant efficacy and also cause formulation problems due to the amounts of so lvent required for so lubilizing the cyano acrylate monomers.

Thus, there is therefore a real need for compositions that do not have the drawbacks mentioned above, i. e . which impart a satisfactory antiperspirant effect, notably in terms of efficacy and of resistance to sweat, and which are suitably to lerated by the skin.

The applicant discovered, surprisingly, that it is possible to employ, on the skin, one or more pressure-sensitive adhesive compounds having the required properties, i. e. which provide effective treatment of sweating in humans while possessing a toxico logical profile suitable for the skin and while being easy to formulate in products intended to reduce sweating.

In fact, the applicant found that the use of pressure-sensitive adhesive compounds on the skin permitted the immediate formation o f a coating that is adhesive at room temperature and adheres easily to the skin.

In particular, the coating, which is formed by depositing pressure-sensitive adhesive compounds on the skin, is flexible, which endows it with considerable mobility. In other words, the adhesive coating obtained is capable o f deforming owing to its flexibility, as a function o f the movements o f the skin.

Thus, the app licant observed that application o f pressure- sensitive adhesive compounds on the skin enabled a flexible coating to be formed on the skin, which was able to reform easily fo llowing changes caused notably by rubbing, movement of the skin or the possible presence o f water droplets.

The present invention therefore notably relates to the use o f one or more pressure-sensitive adhesive compounds as an agent for the cosmetic treatment of sweating in humans . "Agent for treatment of sweating" means, in the sense o f the present invention, any substance which, on its own, has the effect of reducing or limiting the flow of sweat.

In particular, the use of one or more pressure-sensitive adhesive compounds according to the invention makes it possible to confer an antiperspirant effect.

Moreover, the present invention relates to the use o f a cosmetic composition comprising, in a cosmetically acceptable vehicle, one or more pressure-sensitive adhesive compounds for the cosmetic treatment of sweating in humans.

Another obj ect of the present invention consists o f a method for the cosmetic treatment of sweating in humans, and optionally of body odours associated with sweating in humans, notably auxiliary odours, which consists of applying, on the skin, a cosmetic composition comprising, in a cosmetically acceptable medium, one or more pressure-sensitive adhesive compounds.

Moreover, the present invention also relates to a method for the cosmetic treatment of sweating in humans in two stages comprising a first stage (i) consisting of applying, on the skin, a cosmetic composition comprising, in a cosmetically acceptable medium, one or more pressure-sensitive adhesive compounds and a second stage (i) consisting o f reducing any discomfort associated with the adhesive coating formed on the skin by the pressure-sensitive adhesive compound or compounds.

Other obj ects, characteristics, aspects and advantages o f the invention will become clearer on reading the description and the examples presented below.

The pressure-sensitive adhesives (PSA) are viscous, elastic substances that have satisfactory properties o f adhesion, cohesion, capacity for stretching and elasticity. The performance of a pressure- sensitive adhesive is generally evaluated on the basis o f three properties : its immediate tackiness at room temperature (often designated "tack"), its capacity for stretching and its shear stress. Properties such as shear stress or cohesion can be measured by standard tests that are detailed in the scientific literature (Ref: A. Zosel, J. Adhesion, 1994, 44 pp 1 -6) . The pressure-sensitive adhesives are usually constituted of chemical fragments that are responsible for the elastomeric behaviour and tack at room temperature. Thus, the various properties required can be obtained by controlling the amounts of these fragments.

The pressure-sensitive adhesives employed according to the present invention are preferably defined according to the Dahlquist criterion, i. e. as a function o f their storage modulus G' (as described in the work "Handbook of Pressure Sensitive Adhesive Technology, Second Edition, D . Satas, ed. , Van Nostrand Reinhold, New York, NY, 1989, pages 171 - 176 " which is incorporated by reference) .

In the sense of the present invention, the storage modulus G' represents the stiffness and elasticity o f a material. In other words, this modulus expresses the capacity o f a material to store mechanical energy, when it is submitted to a stress, and its capacity to release this mechanical energy in the form o f elastic deformation. This storage modulus G' is preferably measured by means o f a dynamic mechanical analyser.

Thus, within the scope of the Dahlquist criterion, the pressure- sensitive adhesives according to the present invention preferably have a value o f the storage modulus G' o f less than 3. 10⁵ pascal measured at a rate of 10 radians per second at a temperature in the range from 20°C to 22°C .

The pressure-sensitive adhesives according to the invention are compounds that endow the substrate that is coated with them with immediate tack at room temperature, which permits its instantaneous adhesion to a substrate under the effect of brief, light pressure. Even more particularly, the pressure-sensitive adhesives according to the invention are compounds that disp lay immediate tack at room temperature and that adhere to a surface by simp le contact, requiring no more than finger or hand pressure. Moreover, owing to their chemical properties, the pressure-sensitive adhesives display particular properties such as a low glass transition temperature (Tg), a low energy surface (σ) , considerable flexibility and high bonding capacity.

Preferably, the pressure-sensitive adhesive compounds according to the invention do not include the oils, in particular hydrocarbon oils, vegetable oils or silicone oils . In other words, the pressure-sensitive adhesive compounds are not oils, and in particular hydrocarbon oils, vegetable oils or silicone oils .

The pressure-sensitive adhesive compounds used in the present invention are compounds that comprise one or more adhesive organic polymers. In other words, said compounds are made from one or more adhesive organic polymers.

In particular, the pressure-sensitive adhesive compounds used in the present invention can be selected from (i) adhesive organic polymers and (ii) particles having at least one first solid phase covered on at least part of its surface with one or more adhesive organic polymers.

According to one embodiment, the pressure-sensitive adhesive compounds according to the present invention are adhesive organic polymers.

The adhesive character of an organic polymer is generally connected with its glass transition temperature. A necessary but not sufficient condition for a polymer to be adhesive is to have a glass transition temperature (Tg) significantly lower than room temperature, i.e . below a temperature of 25 °C .

The adhesive organic polymers used in the present invention preferably have a glass transition temperature (Tg) less than or equal to 10°C, preferably less than or equal to 0°C .

The glass transition temperature (Tg) of the adhesive organic polymers according to the present invention can be measured by differential scanning calorimetry (D SC) in the following conditions :

To measure the glass transition temperature, prepare a film having a thickness of about 150 mm o f the polymer to be tested by depositing an aqueous solution or dispersion o f the polymer in a circular matrix o f Teflon o f 40 mm diameter and leaving the deposit to dry. Dry the film in a stove at a temperature of about 23 °C and relative humidity o f 45 %, until the weight no longer changes. Take about 5 to 15 mg o f the film, and put it in a crucible, which is then placed in the analyser. The thermal analyser is the model D SC-2920 from the company TA INSTRUMENTS . The initial and final temperatures for temperature scanning are selected so as to be either side of the required glass transition temperature. Temperature scanning is carried out at a rate of 10°C/minute.

This analysis is carried out according to standard ASTM D341 8-97 except for the above modifications.

The adhesive organic polymers used in the present invention preferably have a self-adhesiveness such that the tensile force (F_max in newton (N)) necessary for separating two surfaces coated with said polymer is greater than 1 N, preferably greater than 3 N and in particular greater than 5 N.

The tensile force F_max can be measured in the fo llowing conditions : Two discs each having a surface area o f 38 mm², o f a so lid, rigid, inert and non-absorbent material, preferably glass, are coated with a layer o f the adhesive po lymer to be tested. The polymer is deposited in an amount of 500 μg/mm² from a so lution in a suitable so lvent. After evaporation o f said so lvent for 24 hours at 22°C and at relative humidity o f 50%, the two coated surfaces of the discs are superposed and the discs are pressed together for 20 seconds at a pressure o f 3 newton by means o f a LLOYD extensometer, model LR5K.

Then the glued discs are pulled so as to separate them from one another at a speed of 20 mm/minute and the tensile force is recorded continuously. The maximum tensile force, recorded at the moment o f separation o f the two surfaces, called F_max, characterizes the self- adhesiveness o f the polymer. The higher this force, the greater the self-adhesiveness of the polymer.

The adhesive polymers usable for the present invention can also be characterized by their adhesiveness on an inert material, such as glass. This adhesiveness can be expressed in the form o f energy (Es) supplied by the same extensometer (LLOYD model LR5K) for separating two surfaces o f 38 mm² each coated with said adhesive organic polymers, in the above conditions (500 mg/mm², drying for 24 hours at 22°C, 50% RH) o f an adhesive polymer, from a surface o f polished glass, after compression o f these two surfaces for 30 seconds with a force o f 3 newton. As previously, the pulling speed is 20 mm/min.

This energy Es, corresponding to the total work supplied up to separation, can be calculated according to the fo llowing formula:

in which:

F(x) is the force required to produce a displacement (x),

Xs l is the displacement (expressed in mm) produced by the maximum tensile force, and

Xs2 is the displacement (expressed in mm) produced by the tensile force permitting complete separation of the two surfaces.

For the adhesive polymers used in the present invention, the energy o f separation Es is preferably at most equal to 300 μΐ, preferably at most equal to 250 μΐ.

Thus, for the organic polymers according to the invention to be adhesive, it is therefore necessary that the polymer deposit has the characteristics o f adhesiveness and/or of self-adhesiveness as described above.

The adhesive organic polymers can be crosslinked or non- crosslinked. For concrete examples o f adhesive polymers, reference may be made to the fo llowing applications describing adhesive polymers : W098/38969, FR 2833960 (Cationic or amphoteric self- adhesive polyurethanes) and FR 2833959 (Cationic or amphoteric self- adhesive radical polymers) .

In particular, the adhesive organic polymers according to the invention can be selected from the adhesive polyesters having one or more sulphonic functions, the cationic or amphoteric self-adhesive polyurethanes having one or more tertiary or quaternary amine functions and the self-adhesive cationic or amphoteric radical polymers.

Preferably, the adhesive organic polymers according to the invention can be selected from the adhesive polyesters having one or more sulphonic functions, in particular from the adhesive branched polyesters having one or more sulphonic functions.

More preferably, the adhesive organic polymer according to the present invention corresponds to the branched sulphonic polyester marketed by the company Eastman AQ 1350 under the name AQ 1350. Said branched sulphonic polyester is adhesive and is defined by a glass transition temperature (Tg) of 0°C and a maximum tensile force

^L max equal to 23 newton.

The adhesive organic polymers according to the invention can be cationic po lyurethanes that comprise (a) units derived from one or more tertiary or quaternary amines having two reactive functions with a labile hydrogen, (b) units derived from one or more non-ionic polymers having two reactive functions with a labile hydrogen, and (c) units derived from one or more diisocyanates.

The tertiary or quaternary amines forming the cationic units (a) are preferably selected from the compounds corresponding to one o f the fo llowing formulae :

HX-R_a-N-R_a-XH HX-R_a-N-R_a— XH

Rb ^A"

in which:

each Ra represents independently a linear or branched Ci_₆ alkylene, C₃_₆ cycloalkylene or arylene group, all of which can be substituted with one or more halogen atoms and can have one or more heteroatoms selected from O, N, P and S,

each Rb represents independently a Ci-C₆ alkyl, C₃_₆ cycloalkyl or aryl group, all which can be substituted with one or more halogen atoms and can have one or more heteroatoms selected from O, N, P and S,

each X represents independently an oxygen atom or sulphur atom or an NH group or NRc, where Rc represents a Ci-C₆ alkyl group, and A^" represents a physiologically acceptable counter-ion.

We may mention, as examples of tertiary amines that are particularly preferred for obtaining the cationic or amphoteric self- adhesive polyurethanes of the present invention, N- methyldiethanolamine and N-tert-butyldiethanolamine. These amines are preferably neutralized with mineral or organic acids such as hydrochloric acid or citric acid.

The self-adhesive polyurethanes of the present invention can also comprise anionic units (d) derived for example from carboxylic or sulphonic acids having two functions with a labile hydrogen, such as dimethylo lpropionic acid.

The self-adhesive polyurethanes of the present invention can also comprise non-ionic monomer units (e) derived from non-ionic monomeric compounds having two functions with a labile hydrogen, such as butanedio l or neopentylglycol.

In one embodiment of the present invention, the self-adhesive polyurethanes of the present invention are cationic self-adhesive polyurethanes not containing units (d) and (e) and which are constituted essentially from (a) units derived from one or more tertiary or quaternary amines having two reactive functions with a labile hydrogen, (b) units derived from one or more non-ionic po lymers having two reactive functions with a labile hydrogen, and (c) units derived from one or more diisocyanates.

The cationic polyurethanes have properties of self-adhesiveness that are particularly interesting when the polymer or polymers forming the units (b) of the self-adhesive polyurethanes o f the present invention have a glass transition temperature (Tg), determined by differential scanning calorimetry, below 0° C, preferably below -5 ° C and more preferably below - 10°C .

We may mention, as examples o f non-ionic po lymers able to form units (b), the polyethers, polyesters, polysiloxanes, copolymers of ethylene and o f butylene, the polycarbonates and the fluorinated polymers having a glass transition temperature below 0°C .

The polyethers are quite particularly preferred, and among them, poly (tetramethylene oxide) .

These polymers preferably have a weight-average mo lecular weight between 400 and 10 000 and more particularly between 500 and 5000.

The number of cationic charges carried by the self-adhesive polyurethanes of the present invention depends directly on the mo lar or weight ratio of units (a) to units (b) . Of course, units (c) are used in a practically equimo lar amount relative to the sum o f units (a) and (b) . The mo lar ratio of units (a) to units (b) of the polyurethanes o f the present invention is preferably between 0.01 and 50, more particularly between 0. 1 and 6, better still between 0.2 and 5 and ideally between 0.3 and 5.

The diisocyanates forming units (c) include the aliphatic, alicyclic or aromatic diisocyanates.

Preferred diisocyanates are selected from tetramethylxylylenediisocyanate, methylenediphenyldiisocyanate, methylenecyclohexanediisocyanate, isophoronediisocyanate, toluenediisocyanate, naphthalenediisocyanate, butanediisocyanate and hexyldiisocyanate. These diisocyanates can o f course be used alone or as a mixture o f two or more diisocyanates .

The adhesive organic polymers according to the invention can be self-adhesive cationic or amphoteric radical polymers. In particular, the self-adhesive cationic or amphoteric radical polymers comprise one or more derivatives o f monomers selected from those o f formula

(la), (lb), (Ic), (Id) and (Ie)

Rl

CH₂=C CH₂=C

C=0 C=0

(la) X (lb) X

R³— N— R⁵

Rl" V 4 in which:

Ri represents a hydrogen atom or a methyl group,

R₂ represents a linear, branched, cyclo aliphatic or aromatic divalent C i - 30 hydrocarbon group, which can contain one or more heteroatoms selected from O, N and P,

R3 , R₄ and R₅ represent, each independently, a linear, branched, cycloaliphatic or aromatic C i - 30 hydrocarbon group, which can contain one or more heteroatoms selected from O, N and P, X represents an oxygen atom or an NH group , A- represents the counter-ion o f the quaternary amine, preferably selected from the halide, sulphate, phosphate and carboxylate ions such as acetate,

in which:

X, Ri and R₂ have the meaning stated for formulae (la) and (lb), and

Cycle+ represents a condensed, cycloaliphatic or aromatic monocyclic or bicyclic system, having a tertiary or quaternary amine function, and which can contain one or more additional heteroatoms selected from O, N or P;

(Id) CH₂=C— (C)_p— (X)_q-R₇-N K-R₁₀— Z

R₆ O R₉

in which R₆ represents a hydrogen atom or a linear or branched

C i _4 alkyl group, Rs and R₉ represent, each independently, a hydrogen atom or a linear or branched C i _₄ alkyl group, optionally bearing a COO-, S O₃ - or PO₃H- group, R₇ and Ri o represent, each independently, a divalent hydrocarbon group, in particular a group -(CH₂)n with n between 1 and 4 inclusive, and optionally interrupted by an oxygen atom,

X is an oxygen atom or an NH group, p and q have the value 0 or 1 , Z represents a COO-, S O₃ - or PO₃H- group, where R₇ can form with Rs , R₉ or X, when the latter represents an NH group, an aromatic or non-aromatic heterocycle with 5 , 6 or 7 ring members; (le) CH₂=CR_n—(C-X)_r— Cycle— R₁₂—Z

O

in which

Rii represents a hydrogen atom or a methyl group,

Ri2 represents a divalent Ci_₄ hydrocarbon group,

X represents an oxygen atom or an NH group,

r has the value 0 or 1,

Cycle+ represents a condensed, cycloaliphatic or aromatic monocyclic or bicyclic system, having a tertiary or quaternary amine function, and which can contain one or more additional heteroatoms selected from O, N or P, and Z represents a COO-, SO₃- or PO₃H- group.

We may mention, as examples of cationic ethylenic monomers defined by formulae (la) to (Ie) above, dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, dimethylaminoethyl(meth)- acrylamide, dimethylaminopropyl (meth)-acrylamide, N- morpholinoethyl (meth)acrylate, trimethylammonio-ethyl

(meth)acrylate chloride, trimethylammoniopropyl (meth)acrylate chloride, trimethylammonioethyl(meth)acrylamide chloride, trimethylammoniopropyl(meth)acrylamide chloride and dimethylbenzylammonioethyl (meth)acrylate chloride.

We may mention, as particularly preferred examples of amphoteric monomers of formula (Id) or (Ie), 1 -vinyl-2-(3- sulphopropyl)imidazolium hydroxide, 1 -vinyl-3-(3- sulphopropyl)imidazolium hydroxide, 1 -vinyl-3-(4- sulphobutyl)imidazolium hydroxide, 1 -vinyl-2-methyl-3-(4- sulphobutyl)imidazolium hydroxide, 2-vinyl-l-

(3sulphopropyl)pyridinium hydroxide, 2-methyl-5-vinyl-l-(3- sulphopropyl)pyridinium hydroxide, 4-vinyl-l-(3- sulphopropyl)pyridinium hydroxide, dimethyl-(2-methacryloxyethyl)- 3-sulphopropyl)ammonium hydroxide, diethyl-(2- met hacryloxyethoxy) -2 -ethyl- (3 -sulphopropyl) ammonium hydroxide, 4-vinyl-4-(sulphobutyl)pyridinium hydroxide, N-(3 -sulphopropyl)-N- methacrylamidopropyl-N,N-dimethylammonium hydroxide, N,N- dimethyl-N-(3 -(methacrylamido)propyl)-3 -(sulphopropyl) ammonium hydroxide, N,N-dimethyl-N-(3 -methacrylamidopropyl) carboxypropyl) ammonium hydroxide and N,N-dimethyl-N-(2- methacryloxyethyl-N- (3 -carboxypropyl) ammonium hydroxide.

The self-adhesive cationic or amphoteric po lymers o f the present invention preferably comprise, in addition to the units derived from cationic and/or amphoteric monomers, units derived from non- ionic ethylenic monomers.

The self-adhesive cationic or amphoteric po lymers o f the present invention are particularly interesting when they comprise non- ionic monomers selected from those that form, when homopolymerized, polymers having a glass transition temperature below 0°C .

These non-ionic comonomers are known by a person skilled in the art and can be described by the formulae (Ha) or (lib) :

in which R13 represents a hydrogen atom or a methyl group, X represents an oxygen atom or an NH group, and R14 represents a linear, branched, cycloaliphatic or aromatic C2 -30 hydrocarbon group, which can contain one or more atoms selected from O , S and P .

Among these non-ionic comonomers giving homopolymers with Tg below 0°C, the fo llowing are particularly preferred: ethyl, n-butyl, n-hexyl, 2-ethylhexyl, n-nonyl, lauryl, n-octadecyl, isooctyl, isodecyl, hydroxyethyl, hydroxypropyl and methoxyethyl acrylate, n-hexyl, 2- ethylhexyl, isodecyl, methoxyethyl, alkoxy methacrylate in CI-30-PEG (with 5 to 30 ethylene oxide units), vinyl propionate, and the vinyl neoalkanoates such as vinyl neononanoate and vinyl neododecanoate.

The self-adhesive radical polymers o f the present invention can also contain a small amount of highly hydrophobic non-ionic monomers such as the vinyl monomers with a silicone side chain, chlorotrifluoroethylene, tetrafluoroethylene, and the vinylic, allylic or (meth) acrylic monomers with a perhalogenated hydrocarbon side chain, in particular perfluorinated, such as perfluorohexyl (meth)acrylate or perfluorooctyl (meth)acrylate.

When the self-adhesive cationic or amphoteric polymers o f the present invention are constituted both of cationic or amphoteric monomers and o f non-ionic monomers giving homopolymers having a glass transition temperature Tg below 0°C, the units derived from cationic or amphoteric ethylenic monomers represent from 1 to 50 wt. % of the polymer, preferably from 1 to 20 wt. % of the polymer, and the units derived from non-ionic ethylenic monomers giving homopolymers having a glass transition temperature Tg below 0° C represent from 50 to 99 wt. % of the polymer, preferably from 80 to 99 wt. % of the polymer.

The self-adhesive polymers of the present invention can comprise - in addition to the units derived from cationic or amphoteric monomers and the units derived from non-ionic monomers giving homopolymers having a glass transition temperature Tg below 0°C - a certain proportion of anionic ethylenic comonomers.

These comonomers are ethylenic monomers bearing at least one carboxylic acid, sulphonic acid or phosphonic acid function.

They are selected for example from acrylic acid, methacrylic acid, itaconic acid, crotonic acid, fumaric acid, maleic acid, vinylbenzoic acid, vinylbenzenesulphonic acid, acrylamidopropanesulphonic acid and vinylphosphonic acid or from the salts o f addition o f mineral or organic bases of these acids.

Introduction o f these anionic comonomers makes it possible to adjust the balance o f charges, modify the hydrophilic character and therefore the so lubility o f the polymers obtained or modulate the compatibility o f the polymers with certain cosmetic substrates.

According to another embodiment, the pressure-sensitive adhesive compounds are particles having at least one first so lid phase covered on at least part of its surface with one or more adhesive organic polymers.

Thus, the pressure-sensitive adhesive compounds according to the invention may be in the form o f particles covered wholly or partly with one or more adhesive organic polymers.

In particular, the pressure-sensitive adhesive compounds are particles having a number-based primary size in the range from 1 to Ι ΟΟΟμιη, preferably in the range from 5 to 35 μιη and more preferably in the range from 10 to 25 μιη.

In the sense o f the present invention "primary particle size" means the maximum dimension that can be measured between two diametrically opposite points o f an individual particle. It is understood that when it is a population o f particles of different sizes, the size stated corresponds to the number-average size o f the population.

The size can be determined by transmission electron microscopy or from measurement of the specific surface by the BET method or from laser granulometry.

In this embodiment, the pressure-sensitive adhesive compounds are particles that are covered on at least a part of their surface with one or more adhesive organic polymers and which can have a spherical or non-spherical geometric shape.

Advantageously, the pressure-sensitive adhesive compounds according to the invention are particles having a non-spherical geometric shape, which means they can adapt easily to the skin, notably to the deformations o f the skin and minimize the risks o f discomfort for the user.

In particular, the pressure-sensitive adhesive compounds according to the invention can be particles having a shape with one or more flat and/or curved faces, preferably at least one flat face and more particularly two flat faces. As examples, the pressure-sensitive adhesive compounds according to the invention are particles having the shape o f a tetrahedron, o f a cube, o f a plate, of a fibre or of a concave or convex lens.

Preferably, the pressure-sensitive adhesive compounds according to the invention are particles having a flat shape, in particular plate, fibre or lens optionally having a concave face and a convex face or two concave faces or two convex faces.

In this embodiment, the pressure-sensitive adhesive compounds are particles whose surface is covered partially or completely with one or more adhesive organic polymers.

In the case when the pressure-sensitive adhesive compounds are spheres, just their upper hemisphere can be covered with an adhesive organic polymer, whereas the lower hemisphere is not covered with the adhesive organic polymer.

In the case when the pressure-sensitive adhesive compounds are plates, just one o f the faces o f these plates can be covered with an adhesive organic polymer. Said plates can be produced by forming plates beforehand, which are spread on a surface. Then a composition comprising one or more adhesive organic polymers is sprayed in order to cover all or part of the surface o f the plates. Next, the who le is covered with a thickening composition. The surface is then scraped so that the particles become embedded in the thickened composition.

Preferably, all or nearly all of the surface o f the particles is covered with an adhesive organic polymer.

In a first variant, the pressure-sensitive adhesive compounds according to the invention can be particles comprising at least one first non-coalescent solid phase covered on at least a part of their surface with one or more adhesive organic polymers.

In the sense of the present invention, non-coalescent solid phase or non-coalescent particle means particles which, after deposition on the skin and evaporation of the so lvent in which said particles are dispersed, remain in an individualized form without forming a continuous or discontinuous film with the adj acent particles . In other words, when the pressure-sensitive adhesive compounds are particles constituted of a non-coalescent solid phase, these compounds maintain their geometric shape, despite their ability to adhere to the skin. The pressure-sensitive adhesive compounds are then considered to be non-film-forming or non-filming particles.

The non-coalescent solid phase o f the particles can be o f organic or mineral nature. We may mention, as examples o f mineral materials usable for the non-coalescent solid phase, metals and metal alloys, metal oxides, carbides or nitrides, ceramic materials and mineral glasses.

When the non-coalescent solid phase is an organic phase, it is generally an organic polymer. In order to be non-coalescent, this polymer must be in the vitreous state, i. e. have a glass transition temperature significantly higher than room temperature or the temperature of use (for example the temperature of the human body), and/or must be crosslinked. In particular, the organic polymer constituting the non-coalescent solid phase of the particles has a glass transition temperature significantly above 25 °C .

The glass transition temperature of the organic polymers usable for the so lid phase is preferably above 40°C, preferably above 60°C and in particular between 80°C and 200°C .

Among these polymers, we may mention non-exhaustively, polystyrene, poly(vinyl acetate), poly(alpha-methylstyrene), poly(acrylamide), poly(acrylonitrile), poly(vinyl chloride), copolymers based on styrene and C i _₄ alkyl (meth)acrylate, copolymers based on styrene and acrylamide, copolymers based on styrene and acrylonitrile, copolymers based on styrene and vinyl acetate, copolymers based on acrylamide and C i _₄ alkyl (meth)acrylates, copolymers based on acrylonitrile and C i _₄ alkyl (meth)acrylate, copolymers based on acrylonitrile and acrylamide, terpolymers based on styrene, acrylonitrile and acrylamide, poly(methyl methacrylate), poly(ethyl methacrylate), styrene/butadiene, styrene/acrylic acid, styrene/vinylpyrrolidone and butadiene/acrylonitrile copolymers. The non-coalescent solid phase of the particles of the present invention bears, on part or on all o f its surface, a deposit of adhesive organic polymer.

The adhesive polymer can be immobilized on the surface o f the non-coalescent solid phase by covalent chemical bonds (grafting), in particular by means of hydroxyl, amine or acid functions, or by weak physicochemical interactions such as hydrophobic interaction, hydrogen bonds and van der Waals forces (adsorption) .

The adhesive organic polymer who lly or partly covering the surface o f the non-coalescent so lid part of the particles is as described above.

Preferably, the pressure-sensitive adhesive compounds according to the invention are particles having a non-coalescent solid phase covered at least partly with an adhesive branched polyester having one or more sulphonic functions.

More preferably, the pressure-sensitive adhesive compounds are particles having a non-coalescent solid phase covered completely with a branched sulphonic po lyester marketed by the company Eastman AQ 1350 under the name AQ 1350.

Even more preferably, the pressure-sensitive adhesive compounds are non-coalescent so lid plates that are covered with a branched sulphonic polyester marketed by the company Eastman AQ 1350 under the name AQ 1350.

In particular, the pressure-sensitive adhesive compounds are adhesive micro-obj ects, in particular non-coalescent at room temperature, such as those so ld by the companies API under the name Gel Talc 100 or 600.

In a second variant, the pressure-sensitive adhesive compounds according to the invention are particles constituted so lely o f one or more adhesive organic polymers as described above.

In this case, since the adhesive organic polymers have a glass transition temperature (Tg) below room temperature and preferably below 10°C, the pressure-sensitive adhesive compounds in the form o f particles, after deposition on the skin and evaporation o f the so lvent in which said compounds are dispersed, will tend to form a continuous film that adheres to the skin with the other adj acent adhesive compounds present on the skin.

In this case, the pressure-sensitive adhesive compounds are considered to be film-forming or filming particles.

According to this second variant, the so lid phase is formed by one or more adhesive organic polymers. In other words, the pressure- sensitive adhesive compounds are particles having at least one first so lid formed by one or more adhesive organic polymers and covered on at least part of its surface with one or more adhesive organic polymers.

According to another embodiment, the pressure-sensitive adhesive compounds constitute a coating having one or more adhesive organic polymers, said coating being arranged on a support, which can be a flexible or non-flexible obj ect, for example a sheet or a tissue.

Thus, the pressure-sensitive adhesive compounds according to the invention, being in the form o f a coating, can be transferred by rubbing or by contact with the skin.

Preferably, the pressure-sensitive adhesive compounds according to the invention are selected from adhesive branched polyesters having one or more sulphonic functions and particles, notably plates, having a non-coalescent solid phase covered at least partially with a polyester branched adhesive having one or more sulphonic functions.

Moreover, the present invention relates to the use of a cosmetic composition comprising, in a cosmetically acceptable medium, one or more pressure-sensitive adhesive compounds for the cosmetic treatment of sweating in humans.

The pressure-sensitive adhesive compound or compounds can be present in the cosmetic compositions according to the invention at a content in the range from 0. 1 to 60 wt. % relative to the total weight of the composition.

In particular, when the pressure-sensitive adhesive compounds are adhesive organic polymers, these compounds are preferably present in the cosmetic composition according to the invention at a content in the range from 1 to 20 wt. % relative to the total weight of the composition.

When the pressure-sensitive adhesive compounds are in the form o f filming particles, these compounds are preferably present in the cosmetic composition according to the invention at a content in the range from 5 to 20 wt.% relative to the total weight of the composition.

When the pressure-sensitive adhesive compounds are in the form o f non-filming particles, these compounds are preferably present in the cosmetic composition according to the invention at a content in the range from 7 to 40 wt. % relative to the total weight of the composition.

According to one embodiment, the cosmetic compositions according to the invention are compositions that are liquid at room temperature (25 °C) and at atmospheric pressure (760 mmHg) .

In this case, the cosmetically acceptable medium is a liquid medium formed from water and/or from one or more organic so lvents commonly used in cosmetics. These cosmetically acceptable solvents are liquid at room temperature and at atmospheric pressure. These so lvents are preferably monohydric alcohols, polyols or ethers o f these alcoho ls or polyols. We may mention for example ethano l, isopropanol, glycerol, propylene glycol, monomethyl ether o f propylene glyco l.

The liquid cosmetic compositions comprise pressure-sensitive adhesive compounds, which can be adhesive organic polymers or particles covered on at least a part of their surface with one or more adhesive organic polymers.

The compositions according to the invention can moreover be pressurized and can be packaged in an aerosol constituted of: (A) a container containing an antiperspirant composition comprising one or more pressure-sensitive adhesive compounds as defined previously, (B) at least one propellant and a means of distribution o f said aerosol composition. The propellants generally used in products of this type, and well known by a person skilled in the art, are for examp le dimethyl ether (DME) ; vo latile hydrocarbons such as n-butane, propane, isobutane, and mixtures thereof, optionally with at least one chlorinated and/or fluorinated hydrocarbon; among the latter, we may mention the compounds so ld by the company Dupont de Nemours under the names Freon® and Dymel® , and in particular mono fluorotrichloromethane, difluorodichloromethane, tetrafluorodichloroethane and 1 , 1 -difluoroethane so ld notably under the trade name DYMEL 152 A by the company DUPONT . Carbon dioxide, nitrous oxide, nitrogen or compressed air can also be used as propellant.

The means of distribution, which forms part of the aerosol, is generally constituted of a distributing valve controlled by a distributing head, itself comprising a nozzle by which the aerosol composition is vaporized. The container containing the pressurized composition can be opaque or transparent. It can be made of glass, o f polymer material or of metal, optionally covered with a layer of protective varnish.

Thus, the compositions according to the present invention can be packaged in pressurized form in an aerosol or in a pump bottle, packaged in a device equipped with a roll-on applicator or else packaged in a device equipped with an openwork wall, notably a grille, which contain one or more pressure-sensitive adhesive compounds.

In this connection, said compositions contain the ingredients that are generally used in products of this type and are well known to a person skilled in the art.

The compositions can therefore be packaged in applicators of the roll-on type or sprays or can be applied on wipes.

According to one embodiment, the cosmetic compositions according to the invention are so lid compositions.

Thus, the so lid cosmetic compositions comprise pressure- sensitive adhesive compounds in the form of particles, in particular in the form of non-coalescent solid particles covered with one or more adhesive organic polymers. These cosmetic compositions do not comprise liquid so lvents. In this case, the particles are preferably plates.

According to one embodiment, the cosmetic compositions according to the invention can be anhydrous compositions in the form of film.

In the sense o f the present invention, " film" means a thin, graspable so lid. "Thin" means a so lid having a thickness o f at most 1000 μιη. This film is generally o f a suitable size so that it can be manipulated easily by the user. It can have the shape of a square, rectangle, disc or any other shape. Each film generally has a thickness from 10 μιη to 1000 μιη, preferably from 20 to 500 μιη and more preferably from 50 to 300 μιη. It can have an area from 10 to 800 cm² and preferably from 100 to 600 cm².

Moreover, "anhydrous composition" means, in the sense of the present invention, a composition containing less than 1 0 wt. % of water, preferably less than 5 wt. % relative to the total weight of the film, and even more preferably less than 1 wt. % of water. Preferably, the anhydrous composition does not contain water.

To the extent that the pressure-sensitive adhesive compounds have an antiperspirant effect, the film does not need to be occlusive.

The anhydrous cosmetic composition in film form can break naturally fo llowing movements o f the skin or it can disintegrate with water, with moisture or after application of a cream, a gel or a so lvent, permitting the pressure-sensitive adhesive compounds to be released.

The cosmetic compositions according to the invention can further comprise one or more agents for controlling the immediate tack at room temperature of the pressure-sensitive adhesive compounds o f the present invention.

In particular, the cosmetic compositions according to the invention can comprise one or more agents for reducing the immediate tack at room temperature of the pressure-sensitive adhesive compounds o f the present invention. According to a first particular embo diment, the cosmetic compositions according to the invention can comprise one or more particles capable of forming a film but not displaying tackiness at room temperature, i. e. the cosmetic compositions according to the invention comprise one or more particles that are considered to be filming and non-tacky.

Thus, the cosmetic compositions according to the invention can comprise one or more particles having at least one non-coalescent so lid phase, the surface o f which is covered with one or more adhesive organic polymers and one or more particles capable of forming a film but not displaying tackiness at room temperature.

As a variant, the cosmetic compositions according to the invention can comprise one or more particles constituted solely o f one or more adhesive organic polymers and one or more particles capable of forming a film but not displaying tackiness at room temperature.

Alternatively, the cosmetic compositions according to the invention can comprise one or more adhesive organic polymers and one or more particles capable of forming a film but not displaying tackiness at room temperature.

As particles capable of forming a film but not displaying tackiness at room temperature, we may mention latices o f acrylate/methacrylate copolymer having a glass transition temperature (Tg) equal to 20°C or dispersions or microdispersions o f wax.

According to a second particular embo diment, the cosmetic compositions according to the invention can comprise one or more non-coalescent particles that do not display tackiness at room temperature. Such particles are considered to be non-filming and non- tacky.

Thus, the cosmetic compositions according to the invention comprise one or more particles having at least one non-coalescent so lid phase, the surface of which is covered with one or more adhesive organic polymers in combination with one or more non-coalescent particles that do not display tackiness at room temperature. As a variant, the cosmetic compositions according to the invention can comprise one or more particles constituted solely o f one or more adhesive organic polymers in combination with one or more non-coalescent particles not displaying tackiness at room temperature.

Alternatively, the cosmetic compositions according to the invention can comprise one or more adhesive organic polymers in combination with one or more non-coalescent particles not displaying tackiness at room temperature.

As non-coalescent particles not displaying tackiness at room temperature, we may notably mention inorganic particles such as the iron oxide pigments, particles o f magnesia, calcium carbonate, fibrous particles such as cellulo se fibres, organic particles. It is also possible to use lubricating plates such as boron nitride or natural compounds such as particles of flour, of protein, natural fibres such as wool, cotton or flax.

According to a third particular embo diment, the cosmetic compositions according to the invention can comprise one or more compounds not displaying tackiness at room temperature. Such compounds are considered to be non-tacky compounds.

Thus, the cosmetic compositions according to the invention comprise one or more particles having at least one non-coalescent so lid phase covered with one or more adhesive organic polymers in combination with one or more compounds not displaying tackiness at room temperature.

As a variant, the cosmetic compositions according to the invention can comprise one or more particles constituted solely o f one or more adhesive organic polymers in combination with a compound not displaying tackiness at room temperature.

Alternatively, the cosmetic compositions according to the invention can comprise one or more adhesive organic polymers in combination with a compound not displaying tackiness at room temperature.

As compounds that do not have tackiness at room temperature, we may notably mention the so luble polymers such as those so ld under the name Mexomer by the company Chimex, those so ld under the name Luviset Pur by the company BASF, polymers with silicone grafts such as those so ld under the name VS 80 by the company 3 M, silicone polymers such as aminated silicones, block copolymers.

Moreover, as compounds that do not have tackiness at room temperature, we may also mention fats such as fatty alcoho ls, fatty acids, cationic, anionic, non-ionic or amphoteric surfactants. They can be introduced as they are or prepared or used for making emulsions, micro-emulsions or nanoemulsions or inverted emulsions.

It is possible to use agents having a regulating effect on the immediate tack at room temperature of the pressure-sensitive adhesive compounds, which varies over time, such as compounds that evaporate at room temperature, in particular vo latile silicones, compounds that are absorbed by the skin such as glycerol, compounds that can be used for making emulsions with phase inversion or compounds that undergo or produce a chemical reaction, for example reactive silicones.

The cosmetic compositions according to the invention can further comprise one or more cosmetic additives selected from emollients, antioxidants, opacifiers, stabilizers, hydrating agents, vitamins, bactericides, preservatives, lustre agents, pigments, dyes, fluidizing agents, perfumes, thickeners, soothing agents, refreshing agents, antiperspirants such as aluminium salts, agents that absorb odours such as cyclodextrin, agents for absorbing water and moisture such as calcium salts, agents for absorbing fats, especially oils, antibacterial agents, antiseptics, antibiotics, destructuring so lvents such as urea, photoprotective agents, depilatories, decolorizing agents, self-tanning agents, depigmenting agents or any other ingredient usually employed in cosmetics for this type of application.

Of course, a person skilled in the art will take care to select this or these optional additional compound(s) in such a way that the advantageous properties attaching intrinsically to the cosmetic composition according to the invention are not, or substantially not, adversely affected by the addition or additions envisaged. The present invention also relates to a method for the cosmetic treatment of sweating in humans, and optionally of body odours associated with sweating in humans, notably auxiliary odours, which consists o f applying a cosmetic composition comprising, in a cosmetically acceptable medium, one or more pressure-sensitive adhesive compounds, on the skin.

In particular, the cosmetic composition comprising one or more pressure-sensitive adhesive compounds can be applied on the skin and can then be rinsed.

Preferably, the cosmetic composition according to the invention is not rinsed after application.

Moreover, according to one embodiment, the present invention also relates to a method of cosmetic treatment of sweating in humans in two stages comprising (i) a stage consisting of applying, on the skin, a cosmetic composition A comprising one or more pressure- sensitive adhesive compounds for conferring an antiperspirant effect and (ii) a stage consisting o f reducing the discomfort connected with the adhesive coating formed on the skin by the pressure-sensitive adhesive compound or compounds, in particular the discomfort connected with the sticky nature of the pressure-sensitive adhesive compound or compounds.

In other words, the second stage (ii) makes it possible to minimize any discomfort connected with the pressure-sensitive adhesive compounds once these compounds form a coating that adheres to the skin.

According to this embodiment, the second stage (ii) o f the method can consist of treating the skin chemically or physically. In particular, the second stage (ii) o f the method can consist of applying, on the skin, a cosmetic composition B capable of reducing the discomfort caused by deposition o f the pressure-sensitive adhesive compound or compounds or for treating the skin physically.

In particular, the second stage (ii) of the method consists o f applying, on the skin, a cosmetic composition B capable of reducing the discomfort caused by deposition o f the pressure-sensitive adhesive compound or compounds.

Thus, the first stage (i) can consist of the application, on the skin, o f a cosmetic composition A comprising one or more pressure- sensitive adhesive compounds for conferring an antiperspirant effect and the second stage (ii) can consist of the application o f a cosmetic composition B, which can be a powder, a gel or an oil capable of reducing the discomfort caused by the sticky nature of the pressure- sensitive adhesive compounds.

Moreover, the first stage (i) can consist of the application, on the skin, o f a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds dispersed in a water-inso luble elastomeric matrix which is a latex and the second stage (ii) can consist of rinsing the skin with soapy water in order to remove, from the surface, the pressure-sensitive adhesive compounds that emerge.

The first stage (i) can also consist o f the application, on the skin, o f a cosmetic composition A comprising one or more pressure- sensitive adhesive compounds dispersed in a guar gel and the second stage (ii) can consist o f applying one comprising calcium chloride for physical crosslinking of the surface of the guar gel.

As a variant, the first stage (i) can also consist of the application, on the skin, o f a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds and one or more expandable particles that can swell in the presence of water and the second stage (ii) can consist of applying water on the skin.

As stated above, the second stage (ii) o f the method can consist of treating the skin physically.

The physical treatment of the skin can be performed by raising the temperature of the skin, after application o f cosmetic composition A comprising one or more pressure-sensitive adhesive compounds, by means of an external heat source. In this case, the second stage (ii) o f the method consists o f circulating the heat in contact with the skin by means of an external heat source, notably a device capable o f generating heat. The physical treatment of the skin can also be performed by irradiating the skin after application of cosmetic composition A comprising one or more pressure-sensitive adhesive compounds. The second stage (ii) o f the method then consists of treatment with light.

Within the scope of this treatment with light, it is preferable to use energies in the range from 0.001 J to 20J, preferably in the range from 0.04J to 4J. The exposure o f the skin to this treatment with light can vary from some seconds to several tens of minutes.

Thus, the first stage (i) can consist o f the application, on the skin, o f a cosmetic composition A comprising one or more pressure- sensitive adhesive compounds, one or more waxes and/or one or more crystalline polymers and the second stage (ii) can consist o f raising the temperature of the skin by means o f a heat source after application of composition A so as to melt the wax or waxes and/or the crystalline polymer or polymers on the surface in order to form a layer on the adhesive coating formed by the pressure-sensitive adhesive compound or compounds according to the invention.

In particular, the wax or waxes usable in composition A described above can be o f natural origin or of synthetic origin and can have melting points that can be below 80°C . For examp le, the wax or waxes can be fatty alcoho ls having from 8 to 40 carbon atoms, ethoxylated C 12 - C22 fatty alcoho ls having from 2 to about 30 mo les o f ethylene oxide, esters and amides o f fatty acids and o f monohydroxy and polyhydroxy fatty acids having from 10 to 40 carbon atoms, triglycerides, all said compounds being solid at 25 °C, silicone waxes, beeswaxes, paraffin and isoparaffin waxes. Examp les o f such systems are notably described in patent applications WO-01 / 13871 pages 9- 10, WO-01 /07007 page 29, or WO-00/74643 pages 26-29, the contents of which form an integral part of the present invention.

Moreover, the first stage (i) can consist of the application, on the skin, o f a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds and one or more photosensitive materials and the second stage (ii) can consist of irradiating the skin so as to cause crosslinking of the photosensitive material. As a variant, the first stage (i) can consist of the app lication, on the skin, o f a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds and one or more expandable particles that can swell under the action of heat and the second stage (ii) can consist of raising the temperature of the skin by means o f a heat source in order to cause the expandable particle or particles to swell.

The expandable particles that can swell under the action of heat can be in the form o f thermoexpandable particles.

"Thermoexpandable" means more particularly particles that can deform and expand under the action o f heat.

The expandable particles that can swell under the action of heat can be expanded powders such as ho llow microspheres and notably the microspheres formed from a terpolymer o f vinylidene chloride, acrylonitrile and methacrylate and marketed under the name EXPANCEL by the company Kemanord Plast under references 55 1 DE 12 (grain size of about 12 μιη and density 40 kg/m³), 55 1 DE 20 (grain size o f about 30 μιη and density 65 kg/m³), 55 1 DE 50 (grain size o f about 40 μηι), or the microspheres marketed under the name MICROPEARL F 80 ED by the company Matsumoto .

According to one variant, the present invention relates to a method of cosmetic treatment of sweating in humans in two stages comprising (i) a stage consisting o f applying, on the skin, a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds for conferring an antiperspirant effect and (ii) a stage consisting o f reducing the discomfort connected with the application of the pressure-sensitive adhesive compound or compounds for reinforcing the antiperspirant effect.

Thus, the first stage (i) can consist of the application, on the skin, o f a cosmetic composition A comprising one or more pressure- sensitive adhesive compounds and the second stage (ii) can consist of applying, on the skin, a cosmetic composition B comprising one or more antiperspirant active ingredients. In particular, the antiperspirant active ingredient or ingredients usable in cosmetic composition B are selected from the aluminium salts, in particular the aluminium hydrochlorides or complexes thereo f.

Among the aluminium hydrochlorides and complexes containing them used in the antiperspirant sticks o f the present invention, we may mention the fo llowing substances used and approved by the FDA (Food and Drug Administration) : aluminium chlorohydrate, aluminium chlorohydrex PEG, aluminium chlorohydrex PG, aluminium dichlorohydrate, aluminium dichlorohydrex PEG, aluminium dichlorohydrex PG, aluminium sesquichlorohydrate, aluminium sesquichlorohydrex PEG, aluminium sesquichlorohydrex PG, aluminium zirconium octachlorohydrate, aluminium zirconium octachlorohydrex GLY, aluminium zirconium pentachlorohydrate, aluminium zirconium pentachlorohydrex GLY, aluminium zirconium tetrachlorohydrate, aluminium zirconium trichlorohydrate, aluminium zirconium tetrachlorohydrex GLY, and aluminium zirconium trichlorohydrex-GLY, in which the symbo ls PEG, PG and GLY denote polyethylene glyco l, propylene glyco l and glycine respectively. Commercial products o f this type are so ld for example by the company CLARIANT under the name LOCRON S (aluminium chlorohydrate), by the company REHEIS under the name REACH 301 or by the company GUILINI CHEMIE under the name ALOXICOLL PF 40 (aluminium chlorohydrex), by the company REHEIS under the name REZAL 67 SOLUTION (aluminium zirconium pentachlorohydrate so ld as aqueous solution at 40% of active substance) .

Said aluminium hydrochlorides and complexes thereof are present in the sticks according to the present invention at concentrations in the range from about 1 to 50 wt. % and preferably from about 1 to 30 wt. % of active substance (on the basis of the anhydrous aluminium salt excluding the water and complexing agents) relative to the total weight of composition B .

Moreover, the first stage (i) can consist of the application, on the skin, o f a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds and the second stage (ii) can consist of applying, on the skin, a cosmetic composition B comprising one or more absorbents, which are in particular capable o f absorbing odours or moisture.

The first stage (i) can consist of the application, on the skin, o f a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds and the second stage (ii) can consist o f applying, on the skin, a cosmetic composition B comprising one or more perfuming substances.

The first stage (i) can also consist o f the application, on the skin, o f a cosmetic composition A comprising one or more pressure- sensitive adhesive compounds and one or more photosensitive materials and the second stage (ii) can consist o f raising the temperature of the skin by means o f a heat source or of irradiating the skin so as to melt or crosslink the photosensitive material in order to produce a layer that is superposed on the adhesive coating formed by the pressure-sensitive adhesive compound or compounds according to the invention.

In fact, the photosensitive materials will melt or crosslink to form a layer that is superposed on the adhesive coating formed by the pressure-sensitive adhesive compound or compounds, which will increase the occlusive effect of said adhesive coating.

The first stage (i) can also consist o f the application, on the skin, o f a cosmetic composition A comprising one or more pressure- sensitive adhesive compounds, one or more antiperspirant active ingredients, one or more absorbents, one or more perfuming substances, said antiperspirant active ingredients, absorbents and/or perfuming substances being introduced in a ho llow material that can swell under the action o f heat and the second stage (ii) can consist of irradiating the skin or raising the temperature of the skin after application o f composition A.

According to another variant, the present invention relates to a method of cosmetic treatment of sweating in humans in two stages comprising (i) a stage consisting o f applying, on the skin, a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds for conferring an antiperspirant effect and (ii) a stage further comprising optionally improving the appearance of the skin.

In this case, the first stage (i) can consist of the application, on the skin, o f a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds and the second stage (ii) can consist of applying a composition B comprising one or more dyes and/or pigments.

The dye(s) and/or pigment(s) used in composition B are employed for obtaining dyeing similar to the skin.

As a variant, the first stage (i) can consist of the app lication, on the skin, o f a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds and the second stage (ii) can consist of applying a film having an appearance similar to that of the skin or an antireflective film.

The cosmetic compositions B emp loyed during the second stage (ii) can be packaged in pressurized form in an aerosol, in a pump bottle, packaged in a device equipped with a roll-on applicator, or can be in the form o f tissues or films .

The cosmetic compositions B emp loyed during the second stage (ii) can be applied to the skin itself or through the clothing.

Cosmetic compositions A and B can be applied repeatedly on the skin. Preferably, cosmetic compositions A and B are applied on the skin separately or with a time delay.

When cosmetic compositions A and B are applied on the skin separately, the duration of the pause between application of cosmetic composition A and application o f cosmetic composition B can be between 1 second and 1 hour, preferably between 10 seconds and 20 minutes, and even more preferably between 1 minute and 6 minutes.

According to one embodiment, the skin can be rinsed between application of cosmetic composition A and application o f cosmetic composition B .

Preferably, the skin is not rinsed between application o f cosmetic composition A and application of cosmetic composition B . It should be noted that when cosmetic compositions A and B are applied separately, said cosmetic compositions can be in identical galenic forms or different galenic forms.

When cosmetic compositions A and B are applied on the skin with a time delay, cosmetic composition A can be applied in the morning and cosmetic composition B can be applied in the evening.

The fo llowing examples serve to illustrate the present invention.

EXAMPLES

Example 1 Composition ( 1 A) is prepared from the ingredients given in the fo llowing table, the amounts being expressed by weight unless stated otherwise.

Apply 4g of composition ( 1 A) on the left armpit and leave to dry. After five minutes, apply l g o f powdered wheat flour on the treated area. It is found that the powder adheres to the treated area.

At the end o f the day, compare the sweating occurring at the left armpit that was treated, and the sweating occurring at the right armpit, which had not been treated.

It is found, at the end of the day, that a satisfactory antiperspirant effect is obtained for the left armpit relative to the untreated right armpit. In fact, the left armpit, which was treated, is odour-free whereas the untreated right armpit emits an unpleasant odour.

Example 2

On a mo del, apply 4 grams o f composition ( 1 A) described in example 1 on the left armpit. Leave to dry, then apply 1 gram o f a powdered wheat flour on the same area.

On the same model, apply 1 gram o f powdered wheat flour on the right armpit. After some minutes, put the model in a sauna (hot enclo sure with heating to a temperature of 50°C) for 5 minutes.

Then evaluate the sweating by placing, on each treated area, absorbent paper that becomes dark when it is impregnated with sweat.

The evaluation shows that the absorbent paper is very slightly impregnated in the case o f the left armpit, which was treated with the composition comprising adhesive micro-obj ects, relative to the right armpit, which was treated with powder. Example 3

Composition 2A is prepared from the ingredients given in the fo llowing table, the amounts being expressed by weight unless stated otherwise.

Apply 4g of the composition (2A) on the left armpit and leave to dry. After five minutes, app ly, on the treated area, an absorbent sheet, which adheres to the armpits and forms a light film. This absorbent sheet makes it possible to evaluate sweating.

At the end o f the day, compare the sweating occurring at the left armpit, which was treated, and the sweating occurring at the right armpit, which had not been treated.

It is found, at the end of the day, that a satisfactory antiperspirant effect is obtained for the left armpit relative to the untreated right armpit. In fact, the left armpit that was treated is odour-free whereas the untreated right armpit emits an unpleasant odour. Example 4

On a mo del, apply 4 grams o f composition (2A) described in example 3 on a portion of the back fo llowed by application o f an absorbent sheet. The absorbent sheet adheres at the level o f the adhesive owing to the tackiness of the adhesive polymer o f composition (2A) .

On the same model, apply an absorbent sheet on another portion of the back, ho lding it in place with adhesive tape.

After some minutes, put the model in a sauna (hot enclo sure with heating to a temperature of 50°C) for 5 minutes.

Evaluation shows that the absorbent paper is very slightly impregnated on the portion o f the back that was treated with the composition comprising the adhesive po lymer relative to the portion of the back that had not been treated.

Example 5

Composition (3A) is prepared from the ingredients given in the fo llowing table, the amounts being expressed by weight unless stated otherwise.

On a model, apply 4g of composition (3A) on the left armpit and leave to dry. After five minutes, apply, on the treated area, an absorbent sheet, which adheres to the armpits and forms a light film. This absorbent sheet makes it possible to evaluate sweating. On the same model, apply 4g o f a commercial composition based on aluminium salts on the right armpit. This composition comprises 15 wt. % of aluminium salts relative to the total weight of the composition and a perfume.

Evaluation shows that the absorbent paper is very slightly impregnated on the left armpit, which was treated with the composition according to the invention, relative to the right armpit, which was treated with a composition based on aluminium salts. Example 6

Composition (4A) is prepared from the ingredients given in the fo llowing table, the amounts being expressed by weight unless stated otherwise.

On a model, apply 4g of composition (4A) on the left armpit and leave to dry.

It is found, at the end of the day, that a satisfactory antiperspirant effect is obtained for the left armpit relative to the untreated right armpit. In fact, the left armpit that was treated is odour-free whereas the untreated right armpit emits an unpleasant odour. Example 7

Composition (5A) is prepared from the ingredients given in the fo llowing table, the amounts being expressed by weight unless stated otherwise.

Composition B is packaged in an aerosol using 35 wt. % of dimethyl ether and 65 wt. % of water.

On a model, apply 4g of composition (5A) on the left armpit and leave to dry.

On the same model, spray 4g o f composition (5B) on the right armpit and leave to dry.

At the end o f the day, compare the sweating occurring at the left armpit, which was treated with composition (5A), and the sweating occurring at the right armpit, which was treated with composition (5B) It is found, at the end of the day, that a satisfactory antiperspirant effect is obtained for the left armpit treated with composition (5A) relative to the right armpit. In fact, the left armpit that was treated is odour-free whereas the right armpit treated with composition (5B) emits an unpleasant odour.

Example 8

Composition (8A) is prepared from the ingredients given in the fo llowing table, the amounts being expressed by weight unless stated otherwise.

Deposit composition (8A) on a sheet of greaseproof paper. After 12 hours, deform the sheet of greaseproof paper, taking care to break the layer o f polymer without causing it to become detached.

Then spray this sheet with a composition (8B) comprising an adhesive polyester sold under the name AQ 1350 packaged in an aerosol containing a water/ethano l mixture (50/50) .

Apply this sheet on the skin. It is found that the coating formed on the sheet of greaseproof paper detaches so as to adhere to the skin.

It is found that a satisfactory antiperspirant effect is obtained.

Claims

1 . Use o f one or more pressure-sensitive adhesive compounds as an agent for the cosmetic treatment of sweating in humans.

2. Use according to Claim 1 , characterized in that the pressure- sensitive adhesive compound or compounds are selected from (i) adhesive organic polymers and (ii) particles having at least one first so lid phase covered on at least part of its surface with one or more adhesive organic polymers.

3. Use according to Claim 2, characterized in that the adhesive organic polymer or polymers have a glass transition temperature (Tg) less than or equal to 10°C, preferably less than or equal to 0°C .

4. Use according to Claim 2 or 3 , characterized in that the adhesive organic polymer or polymers display a self-adhesiveness such that the tensile force (F_max in newton (N)) necessary for separating two surfaces coated with said po lymer or polymers, is greater than 1 N, preferably greater than 3 N and in particular greater than 5N.

5. Use according to any one o f Claims 2 to 4, characterized in that the adhesive organic polymer or polymers display a self- adhesiveness such that the energy (Es) supplied for separating two surfaces each o f 38 mm² coated with said polymer or polymers from a polished glass surface is less than 300 μΐ, preferably at mo st equal to 250 μΐ.

6. Use according to any one o f Claims 2 to 5 , characterized in that the adhesive organic polymer or polymers are selected from the adhesive polyesters having one or more sulphonic functions, self- adhesive cationic or amphoteric polyurethanes having one or more tertiary or quaternary amine functions and self-adhesive cationic or amphoteric radical polymers.

7. Use according to any one o f Claims 2 to 6, characterized in that the adhesive organic polymer or polymers are selected from adhesive branched po lyesters having one or more sulphonic functions.

8. Use according to any one o f Claims 2 to 7, characterized in that the particles have a primary size by number in the range from 1 to Ι ΟΟΟμηι, preferably in the range from 5 to 35 μιη and more preferably in the range from 10 to 25 μιη.

9. Use according to any one o f Claims 2 to 7, characterized in that the particle or particles have a spherical or non-spherical geometric shape, preferably having one or more flat and/or curved faces.

10. Use according to any one o f Claims 2 to 9, characterized in that the particle or particles comprise at least one first non-coalescent so lid phase covered on at least part of its surface with one or more adhesive organic polymers.

1 1 . Use according to Claim 10, characterized in that the first non-coalescent solid phase is formed from a mineral material selected from metals and metal alloys, metal oxides, carbides or nitrides, ceramic materials and mineral glasses.

12. Use according to Claim 10, characterized in that the first non-coalescent solid phase is formed from an organic polymer having a glass transition temperature above 40°C, preferably above 60°C and in particular between 80°C and 200°C .

13. Use according to any one o f Claims 2 to 9, characterized in that the particle or particles are constituted solely o f one or more adhesive organic polymers.

14. Use o f a cosmetic composition comprising, in a cosmetically acceptable medium, one or more pressure-sensitive adhesive compounds for the cosmetic treatment of sweating in humans.

15. Use according to Claim 14, characterized in that the cosmetic composition further comprises one or more agents for regulating the immediate tack at room temperature of the pressure- sensitive adhesive compounds.

16. Method of cosmetic treatment of sweating in humans, and optionally of body odours associated with sweating in humans, notably auxiliary odours, consisting o f applying, on the skin, a cosmetic composition comprising, in a cosmetically acceptable medium, one or more pressure-sensitive adhesive compounds as defined according to any one o f Claims 1 to 13.

17. Method of cosmetic treatment of sweating in humans according to Claim 16, characterized in that it comprises a first stage consisting of applying, on the skin, a cosmetic composition A comprising one or more pressure-sensitive adhesive compounds for conferring an antiperspirant effect and a second stage consisting o f reducing the discomfort connected with the adhesive coating formed on the skin by deposition o f the pressure-sensitive adhesive compound or compounds.

1 8. Method according to Claim 17, characterized in that the second stage consists o f applying a cosmetic composition B capable o f reducing the discomfort connected with the adhesive coating formed on the skin by deposition o f the pressure-sensitive adhesive compound or compounds or for physical treatment of the skin.

19. Method according to Claim 17, characterized in that the second stage (ii) consists o f circulating the heat in contact with the skin by means o f an external heat source or irradiating the skin by means of a light source.

20. Method according to Claim 1 8 or 19, characterized in that the second stage further consists o f reinforcing the antiperspirant effect.

21 . Method according to any one of Claims 17 to 20, characterized in that the second stage (ii) further consists of improving the appearance of the skin.