RU2789388C2 - Aqueous composition containing aerogel particles of hydrophobic silicon dioxide, deodorant and/or active antiperspirant, and specific alcohol - Google Patents

Abstract

FIELD: cosmetology.

SUBSTANCE: group of inventions relates to cosmetic treatment of keratin material. A composition for application to keratin material for reduction or prevention of formation of unpleasant body odors contains, in a cosmetically acceptable medium: a) an aqueous phase, b) at least aerogel particles of silylated hydrophobic silicon dioxide, c) at least one alcohol selected from a group consisting of propylene glycol, glycerin, and mixtures thereof, and d) caprylyl salicylic acid as active deodorant. Above-mentioned aerogel particles of hydrophobic silicon dioxide are dispersed in the aqueous phase, and their content is from 0.1% by wt. to 5% by wt. per the total weight of the composition. Alcohol is present in amount from 0.1% by wt. to 80% by wt. per the total weight of the composition. The composition does not have a form of an oil/water emulsion. A method for cosmetic treatment of keratin material for reduction or prevention of formation of unpleasant body odors associated with human sweating is also disclosed.

EFFECT: group of inventions provides good deodorizing efficiency providing feeling of freshness.

16 cl, 7 tbl, 6 ex

Description

The present invention relates to a composition containing in a cosmetically acceptable medium:

a) an aqueous phase and

b) at least airgel particles of hydrophobic silica, and

c) at least one alcohol of formula (I), which will be described in detail later, and

d) at least one active deodorant other than the above alcohol of formula (I) and/or at least one active antiperspirant; wherein said hydrophobic silica airgel particles are dispersed in an aqueous phase.

The present invention relates to a method for cosmetically treating a keratin material for treating body odors associated with human perspiration, in particular axillary odors and optionally human perspiration, comprising applying to the surface of the keratin material to be treated at least one composition as defined above. .

Exocrine or apocrine sweat has a slight odor when it is released. Its deterioration is carried out by bacteria due to enzymatic reactions, which causes the formation of compounds with an unpleasant odor.

Deodorants have the function of reducing or preventing the formation of unpleasant odors. This goal can be achieved, in particular, through the activity of the deodorant and/or antiperspirant.

Antiperspirant substances have the effect of limiting the flow of sweat. They usually consist of aluminum salts which, on the one hand, are potentially irritating to the skin and which, on the other hand, reduce the flow of sweat by changing the physiology of the skin, which is unsatisfactory.

Deodorant activity can be achieved through various mechanisms, in particular:

- by odor absorption,

- by neutralizing volatile compounds responsible for odour,

- by inhibiting the enzymes responsible for the formation of odorous compounds, and/or

- by bactericidal action, which is preferably selective for strains responsible for odors, or which reduces the growth of bacteria.

Deodorant products are commonly available in the form of roll-ons, tubes, sticks, aerosols, or sprays. The herbal preparations most effective in controlling bad breath are alcoholic herbal preparations. These preparations have the disadvantage that they cause discomfort at the time of application, in particular after shaving the axilla. Emulsions have the disadvantage that they are difficult to wet and dry in the axilla. Anhydrous sticks and aerosols are fatty herbal preparations that leave a greasy feeling in the axilla.

International application WO 2012/084520 describes hard, soft, (semi-soft) anhydrous compositions based on hydrophobic silica airgel particles, which after application give a dry and greasy feeling. WO 2012/084522 also proposes the use of hydrophobic silica airgel particles as an active deodorant in anhydrous roll-on applicators or anhydrous aerosol formulations; these compositions have the disadvantage of imparting a greasy feel.

There is a real need for galenic compositions that have good deodorant performance providing a fresh feeling while at the same time providing moderate wetting and immediate drying effect.

The author of the present invention unexpectedly found that this goal can be achieved with a composition containing, in a cosmetically acceptable environment:

a) water phase

b) at least airgel particles of hydrophobic silica, and

c) at least one alcohol of formula (I), which will be described in detail later, and

d) at least one active deodorant other than the above alcohol of formula (I) and/or at least one active antiperspirant; wherein said hydrophobic silica airgel particles are dispersed in an aqueous phase.

This discovery is the basis of this invention.

The subject of the present invention is therefore a composition comprising, in a cosmetically acceptable medium:

a) an aqueous phase and

b) at least airgel particles of hydrophobic silica, and

c) at least one alcohol of formula (I), which will be described in detail later, and

d) at least one active deodorant other than the above alcohol of formula (I) and/or at least one active antiperspirant.

The present invention relates to a method for the cosmetic treatment of a keratin material for the treatment of body odors associated with human perspiration, especially axillary odors, and optionally for the treatment of human perspiration, comprising applying to the surface of the keratin material to be treated at least one composition, as defined above.

For the purposes of the present invention, the term "cosmetically acceptable medium" is intended to mean a medium that is suitable for topical application of the composition. The physiologically acceptable medium is preferably a cosmetically or dermatologically acceptable medium, i.e. one which is free from or produces an unpleasant odor and which is fully compatible with the route of topical application. In the present case, where the composition is intended for topical application, i.e., for application by application to the surface of the keratin material in question, such a medium is considered especially physiologically acceptable when it does not cause burning, tension or redness unacceptable to the consumer.

For the purposes of the present invention, the expression "hydrophobic silica airgel particles dispersed in an aqueous phase" means hydrophobic silica airgel particles all of which are evenly distributed in the aqueous phase. Thus, compositions in the form of an oil/water emulsion are not part of the present invention.

The term "water phase" is meant to mean a mixture consisting of water and water-soluble cosmetic or dermatological ingredients.

The term "keratin material" is meant to mean skin (or body, face and skin around the eyes), hair, eyelashes, eyebrows, scalp, nails, lips or mucous membranes.

The term "active deodorant" is meant to mean any substance capable of reducing, masking, or absorbing body odors, especially underarm odors.

The term "active antiperspirant" is meant to mean any aluminum salt or complex which, by itself, has the effect of reducing the flow of sweat, reducing the skin feel of moisture associated with human sweat, and the effect of masking human sweat.

Hydrophobic silica airgel particles

The composition according to the invention contains hydrophobic silica airgel particles. They are preferably in the form of a dispersion in the aqueous phase of the composition.

Aerogels are ultralight porous materials, the first of which were obtained by Kistler in 1932.

Typically, aerogels are synthesized by a sol-gel process in a liquid medium and then dried by extraction from a supercritical fluid. The most commonly used supercritical fluid is supercritical CO ₂ . This type of drying makes it possible to avoid compression of the pores and material.

Other types of drying are also possible to obtain porous materials from gel, namely (i) drying by cryo-drying, which consists in curing the gel at low temperature and then sublimation of the solvent, and (ii) drying by evaporation. The materials thus obtained are then known, respectively, as cryogels and xerogels. The sol-gel process and various drying methods are described in detail in Brinker C.J. and Scherer G.W., Sol-Gel Science: New York: Academic Press, 1990.

The term "hydrophobic silica" is meant to mean any silica which has been surface treated with silylating agents, for example with halogenated silanes such as alkylchlorosilanes, siloxanes, in particular dimethylsiloxanes such as hexamethyldisiloxane, or silazanes, in order to to functionalize OH groups with Si-Rn silyl groups, for example trimethylsilyl groups.

Preferably, the hydrophobic silica airgel particles that can be used according to the present invention advantageously have a specific surface area per unit mass (SM) in the range of 500 m ² /g to 1500 m ² /g, preferably 600 m ² /g up to 1200 m ² /g, and, even better, from 600 m ² /g to 800 m ² /g, and / or have an oil adsorption capacity, measured at the humidity point, ranging from 5 ml / g to 18 ml /g particles, preferably from 6 ml/g to 15 ml/g, and, even better, from 8 ml/g to 12 ml/g.

Absorptive capacity, measured at the moisture point, denoted Wp, corresponds to the amount of oil that is needed to add to 100 g of particles in order to obtain a homogeneous paste.

This capacity is determined in accordance with the "moisture point" method or the method for determining the absorption of oil by powder, in accordance with the principle described in the standard NF T 30-022. Absorptive capacity refers to the amount of oil adsorbed on the accessible surface of the powder and/or absorbed by the powder by measuring at the moisture point as described below:

an amount m = 2 g of the powder is placed on a glass plate and then oil (isononyl isononanoate) is added dropwise. After adding 4-5 drops of oil to the powder, stir using a spatula and continue adding oil until conglomerates of oil and powder are formed. From this point on, the oil is added at the rate of one drop per hour and the mixture is then ground to a powder with a spatula. The addition of oil is stopped when a thick, well-blended paste is obtained. This paste must be capable of spreading over the glass plate without cracking or clumping. The volume Vs (expressed in ml) of oil used is then noted.

The oil absorption corresponds to the ratio Vs/m.

The hydrophobic silica airgel particles used in the present invention are preferably silylated silica airgel particles (INCI name: silica silylate).

The production of hydrophobic silica airgel particles that have a surface modified by silylation is described more fully in US Pat. No. 7,470,725.

In particular, hydrophobic silica airgel particles modified on the surface with trimethylsilyl groups should be used.

The hydrophobic silica airgel particles that can be used in accordance with the present invention advantageously have a size expressed as an average diameter (D[0.5]) of less than 1500 µm, and preferably in the range of 1 µm to 30 µm, preferably 5 µm to 25 µm, even better 5 µm to 20 µm, and even better 5 µm to 15 µm.

The specific surface area per unit mass can be determined by the nitrogen absorption method known as the BET method (Brunauer-Emmett-Teller) described in The Journal of the American Chemical Society, vol. 60, p. 309, February 1938, which complies with International Standard ISO 5794/1 (Appendix D). The specific surface area determined by the BET method corresponds to the total specific surface area of the considered particles.

The particle sizes of the airgel according to this invention can be determined by static light scattering using a commercially available particle size analyzer, such as the MasterSizer 2000 from Malvern. The data is processed based on the Mie scattering theory. This theory, which is accurate for isotropic particles, makes it possible to determine, in the case of non-spherical particles, from the "effective" particle diameter. This theory is described in particular in Van de Hulst H.C., “Light Scattering by Small Particles”, chapters 9 and 10, Wiley, New York, 1957.

According to one advantageous embodiment, the hydrophobic silica airgel particles used according to the present invention have a specific surface area per unit mass (SM) in the range of 600 m ² /g to 800 m ² /g and a size expressed as a volume average diameter (D[0.5]), in the range from 5 µm to 20 µm, and, even better, from 5 µm to 15 µm.

In accordance with one preferred embodiment, more specifically, VM-2270 should be used, the particles of which have an average particle size in the range of 5 microns to 15 microns and a specific surface area per unit mass in the range of 600 m ² /g to 800 m ² / G.

The hydrophobic silica airgel particles used according to the present invention may advantageously have a packing density ρ in the range of 0.04 g/cm ³ to 0.10 g/cm ³ and preferably 0.05 g/cm ³ to 0. 08 g/ ^cm3 .

In the context of the present invention, this density can be assessed according to the following protocol, known as the padded density protocol:

40 g of the powder is poured into a measuring cylinder and the cylinder is then placed in a Stav 2003 device from Stampf Volumeter. The cylinder is then subjected to a successive series of 2500 sealing actions (this operation is repeated until the difference in volume between two successive tests is less than 2%); the final volume Vf of the densified powder is then measured directly in the cylinder.

The ramming density is determined by the ratio: mass (m)/Vf, in this case 40/Vf (Vf is expressed in cm ³ and mass in g).

According to one embodiment, the hydrophobic silica airgel particles used according to the present invention have a specific surface area per unit volume, SV, in the range of 5 m ² /cm ³ to 60 m ² /cm ³ , preferably from 10 m ² /cm ³ to 50 m ² /cm ³ , and, even better, from 15 m ² /cm ³ to 40 m ² /cm ³ .

The specific surface area per unit volume is obtained by the ratio:

SV = SM×ρ

where ρ is the packing density, expressed in g/cm ³ and SM is the specific surface area per unit mass, expressed in m ² /g, as described above.

According to one preferred embodiment, the hydrophobic silica airgel particles of the present invention have a specific surface area per unit mass (SM) in the range of 500 m ² /g to 1500 m ² /g, preferably 600 m ² /g to 1200 m ² /g, and, even better, from 600 m ² /g to 800 m ² /g, and have a size expressed as an average diameter (D[0.5]) in the range from 1 μm to 30 μm, and/or oil absorption capacity, measured at the moisture point, in the range of 5 ml/g to 18 ml/g particles, preferably 6 ml/g to 15 ml/g, and even better 8 ml/g up to 12 ml/g.

As hydrophobic silica aerogels that can be used according to the present invention, examples that can be mentioned include an airgel commercially available under the trade name VM-2260 (INCI name: silica silylate) manufactured by Dow Corning, the particles of which have an average size of about 1000 microns and a specific surface area per unit mass in the range from 600 m ² /g to 800 m ² /g.

Also cited are the aerogels available from Cabot as Aerogel TLD 201, Aerogel OGD 201 and Aerogel TLD 203, Enova Aerogel MT 1100 and Enova Aerogel MT 1200.

More specifically, an airgel commercially available under the trademark VM-2270 (INCI name: silica silylate) from Dow Corning, which has an average particle size in the range of 5 microns to 15 microns and a specific surface area per unit, should be used. mass in the range from 600 m ² /g to 800 m ² /g.

Airgel particles of hydrophobic silicon dioxide are used in an amount, preferably in the range from 0.05% of the mass. up to 10% wt., more preferably, from 0.1% wt. up to 5% wt., and, even more preferably, from 0.5% wt. up to 4% wt., based on the total weight of the composition.

Alcohols

The alcohols according to the present invention correspond to the general formula (I), as well as their optical isomers:

Formula (I)

R ₁ means a hydrogen atom or a CH ₂ OH group;

R ₂ means a hydrogen atom or a -OH group;

R ₃ means a hydrogen atom or a linear or branched, saturated or unsaturated C ₁ -C ₅ -alkyl group;

R ₄ means a hydrogen atom or a -OH group, a -CH ₂ OH group, a -CH (OH) -CH ₃ group, a -C (CH ₃ ) ₂ -OH group, a - (O-CH ₂ -CH ₂ ) _n - OH, a group - (O-CH ₂ -CH (CH ₃ )) _m -OH or a group - (CH ₂ -CH ₂ ) _p -OH;

n is an integer in the range from 1 to 10;

m is an integer in the range from 1 to 10;

p is an integer in the range from 1 to 5;

provided that at least one of the radicals R ₁ , R ₂ , R ₃ and R ₄ includes at least one hydroxyl function;

R ₅ means a hydrogen atom or a linear or branched, saturated or unsaturated C ₁ -C ₅ -alkyl group.

More preferably, ethanol, propylene glycol, 1,3-butylene glycol, pentylene glycol, hexylene glycol, dipropylene glycol, propane-1,3-diol, PEG-8, glycerin or mixtures thereof should be used.

Even more preferably, ethanol, propylene glycol, hexylene glycol, glycerin or mixtures thereof should be used.

The alcohol(s) of formula (I) is preferably located in an amount of from 0.1% of the mass. up to 80% wt. and, more preferably, from 0.5% of the mass. up to 60% wt., based on the total weight of the composition.

Water phase

The aqueous phase is preferably at least 90% wt., and preferably between 90% wt. and 98% wt., based on the total weight of the composition.

Active deodorants

In accordance with one particular form of this invention, the compositions may contain at least one deodorant active other than the alcohol of formula (I).

The term "active deodorant" is meant to mean any substance capable of reducing, masking, or absorbing body odors, especially underarm odors.

Active deodorants can be basteriostatic agents or bactericidal agents that attack odor microorganisms in the axilla, such as 2,4,4'-trichloro-2'-hydroxydiphenyl ether (Triclosan®), 2,4-dichloro-2 '-hydroxydiphenyl ether, 3',4',5'-trichlorosalicylanilide, 1-(3',4'-dichlorophenyl)-3-(4'-chlorophenyl)urea (Triclocarban®) or 3,7,11-trimethyldodeca- 2,5,10-trienol (Farnesol®); quaternary ammonium salts such as, for example, cetyltrimethylammonium salts, cetylpyridinium salts, 1,2-decanediol (SYMCLARIOL, manufactured by Symrise), ethyl lauroylarginate hydrochloride (Aminat G, commercially available from Vedeqsa); a lichen extract, for example the product commercially available under the name Usneo from Cosmetochem; glycerol derivatives, e.g. caprylic/capric acid glycerides (Capmul MCM® available from Abitec), glyceryl caprate or glyceryl caprylate (Dermosoft GMCY® and Dermosoft GMC® available from Straetmans), polyglyceryl-2-caprate (Dermosoft DGMC® available from Straetmans) ), biguanide derivatives, for example, salts of polyhexamethylene biguanide; chlorhexidine and its salts; 4-phenyl-4,4-dimethyl-2-butanol (Symdeo MPP® available from Symrise); zinc salts, eg zinc salicylate, zinc gluconate, zinc pidolate, zinc sulfate, zinc chloride, zinc lactate, zinc phenolsulfonate; salicylic acid and its derivatives, such as 5-n-octanoylsalicylic acid (or 5-n-capryloylsalicylic acid), which has the INCI name capryloylsalicylic acid and is sold under the tradename Mexoryl SAB® by Chimex.

Active deodorants can be odor neutralizers or absorbents, such as zinc ricinoleates, sodium bicarbonate; containing silver or metals or not containing silver zeolites, cyclodextrins and their derivatives. They may also be chelating agents such as tetrasodium glutamate diacetate, commercially available under the tradename Dissolvine GL-47-S® from Akzo Nobel, ethylenediaminetetraacetic acid and also its salts (EDTA), or ethylenediaminepentaacetic acid and also its salts (DPTA) .

Also, the active deodorant may be an enzyme inhibitor, such as triethyl citrate.

As active deodorants, more specifically, zinc pidolate, calcium chloride, zinc gluconate, triethyl citrate, 5-n-capryloylsalicylic acid, or mixtures thereof can be used.

In case of incompatibility and/or for their stabilization, for example, some of the active agents mentioned above may be included in small spheres, in particular in ionic or non-ionic vesicles.

Active deodorants may be present in the composition according to this invention in an amount of from 0.001% of the mass. up to 40% wt., based on the total weight of the composition, and preferably in an amount of 0.1% wt. up to 25% wt.

Active antiperspirants

The compositions contain at least one aluminum and/or zirconium salt as an antiperspirant.

The salts are preferably selected from aluminum and/or zirconium salts; complexes of zirconium hydroxychloride and aluminum hydroxychloride with an amino acid, such as those described in US-3792068, commonly known as "ZAG complexes". Such complexes are commonly known as "ZAG" (when the amino acid is glycine (GLY)). ZAG complexes typically have an Al/Zr ratio in the range of about 1.67 to 12.5, and a metal/Cl ratio in the range of about 0.73 to 1.93. Among these products, aluminum/zirconium octahydroxychloride-GLY, aluminum/zirconium pentahydroxychloride-GLY, aluminum/zirconium tetrachloride-GLY and aluminum/zirconium trichloride-GLY can be mentioned.

Among the aluminum salts that may be mentioned are aluminum chlorohydrate, aluminum hydroxychloride, aluminum hydroxychloride-PEG (polyethylene glycol), aluminum hydroxychloride-PG (propylene glycol), aluminum dichlorohydrate, aluminum dihydroxychloride-PEG, aluminum dihydroxychloride-PG, aluminum sesquichlorohydrate, aluminum sesquihydrochloride -PEG, aluminum sesquihydrochloride-PG, alum, aluminum sulfate, aluminum/zirconium octachlorohydrate, aluminum/zirconium pentachlorohydrate, aluminum/zirconium tetrachlorohydrate, aluminum/zirconium trichlorohydrate and especially aluminum chlorohydrate, in activated or non-activated form, available from Reheis under Microdry Aluminum Chlorohydrate® or Guilini Chemie under the trade name Aloxicoll PF 40. Aluminum and zirconium salts are, for example, a product sold by Reheis under the trade name Reach AZP-908-SUF®, "activated" aluminum salts, for example, a product manufactured by Reheis under the trade name Reach 103 or by Westwood under the trade name Westchlor 200.

More specifically, aluminum chlorohydrate should be used.

Active antiperspirants, salts or complexes, can be in the composition according to this invention in an amount of from 0.5% of the mass. up to 25% wt., based on the total weight of the composition.

Additives

The cosmetic compositions of this invention may also include cosmetic adjuvants selected from the group consisting of emollients, antioxidants, opacifiers, stabilizers, humectants, vitamins, preservatives, polymers, fragrances, organic or mineral fillers, thickeners, moisture absorbents, or any other ingredient. commonly used in the cosmetic field for this type of application.

Not to mention that one skilled in the art will proceed with care regarding the selection of the optional additional compound or optional additional compounds so that the beneficial properties substantially associated with the cosmetic composition of this invention are not adversely or substantially impaired. the intended additive(s).

In accordance with one particularly preferred form, the composition according to this invention also contains at least one thickener.

The thickener may be selected from polymeric thickeners that are natural or synthetic, anionic, amphoteric, zwitterionic, nonionic or cationic, and associative or non-associative, and nonpolymeric thickeners such as an electrolyte.

For the purposes of the present invention, the term "associative polymers" is meant to mean hydrophilic polymers which are capable, in an aqueous environment, of reversibly combining with each other or with other molecules. Their chemical structure, more specifically, includes at least one hydrophilic region and at least one hydrophobic region.

The term "hydrophobic group" is meant to mean a radical or polymer comprising a saturated or unsaturated and a straight or branched hydrocarbon chain. If the hydrophobic group means a hydrocarbon radical, it comprises at least 10 carbon atoms, preferably 10-30 carbon atoms, in particular 12-30 carbon atoms, and more preferably 18-30 carbon atoms. Preferably, the hydrocarbon group is derived from a monofunctional compound.

As polymeric thickeners, there may be mentioned, for example, cellulose-based thickeners such as hydroxyethylcellulose, hydroxypropylcellulose and carboxymethylcellulose; guar gum and derivatives thereof, such as hydroxypropyl guar available from Rhodia under the name Jaguar HP 105®; gums of microbial origin such as xanthan gum and scleroglucan gum; carrageenans, eg powdered carrageenan, especially capa-carrageenan and iota-carrageenan, eg Satiagel VP614® available from Cargill; alginates such as Satialgine US 171 EP, Algogel VPC and 0731 Algogel 6021® available from Cargill; glucomannans, such as konjac gum KG120AAT® available from Kevin Food Ingredient; polysaccharides from Porphyridium microalgae, eg Alguard PF® available from Fritarom; synthetic polymeric thickeners resulting from radical polymerization reactions or polycondensation reactions, such as cross-linked homopolymers of acrylic acid or acrylamide propane sulfonic acid, for example Carbomer, for example Carbopol 980® available from Lubrizol; non-ionic crosslinked homopolymers such as crosslinked polyvinylpyrrolidone, for example Flexithix available from Ashland; associative polymers that are non-ionic, including polyurethanes that are anionic or that are amphoteric, such as polymers based on acrylates/C ₁₀ -C ₃₀ -alkyl acrylates, commercially available under the trademarks Pemulen TR1® or Pemulen TR2®, manufactured by Lubrizol; acrylates/Steareth-20-methacrylate copolymer (Aculyn 22 Polymer®), acrylates/Beheneth-25-methacrylate copolymer (Aculyn 28 Polymer®), acrylate-based copolymer (Aculyn 33 Polymer), PEG-150/decyl alcohol/SMDI copolymer ( Aculyn 44 Polymer®) or PEG-150/stearyl alcohol/SMDI copolymer (Aculyn 46 Polymer®) available from Dow Chemical; a polyethylene glycol polycondensate containing 136 moles of ethylene oxide, stearyl alcohol polyoxyethylene with 100 moles of ethylene oxide, and hexamethylene diisocyanate (HDI) having a weight average molecular weight of 30,000 (INCI name: PEG-136/Steareth-100l/SMDI copolymer), commercially available under the trade mark brand Rheolat FX 1100®, manufactured by Elementis, and a copolymer of acryloyldimethyl ammonium taurate, dimethylacrylamide, lauryl methacrylate and Laureth-4-methacrylate crosslinked with trimethylol propane triacrylate, having the INCI name: Crosspolymer-6, sold under the trademark SEPIMAX ZEN ^® by SEPPIC; acrylic acid homopolymers, in particular selected from sodium polyacrylates and potassium polyacrylates, preferably sodium polyacrylate, such as the product sold by Sensient under the trade name Covacryl MV 60® or also sold by Cognis under the trade name Cosmedia®; cationic polymers, for example, quaternary copolymers of vinylpyrrolidone, 1-methyl-3-vinylimidazoline chloride, vinylimidazole and methacrylic acid (INCI name: Polyquaternium 86), such as the commercially available product sold under the trademark Luvigel Advanced® by BASF.

According to one particular form of the present invention, at least partially neutralized acrylic acid homopolymer is used as a thickener, in particular selected from sodium polyacrylates and potassium polyacrylates, preferably sodium polyacrylate, such as the product sold by the company Sensient under the trademark Covacryl MV 60® or also available from Cognis under the brand name Cosmedia®.

In accordance with one particular form of the present invention, the thickener is starch modified by cross-linking with functional agents capable of reacting with the hydroxyl groups of the starch molecules, which are thus linked together (for example, using glyceryl and/or phosphate groups) .

Monostarch phosphates (type A _m -O-PO-(OX) ₂ ), distarch phosphates (type A _m -O-PO-(OX)-OA _m ) or even tristarch phosphates (type A _m -O-PO-(O-Am) ₂ ) or mixtures thereof (A _m means starch), in particular, can be obtained by cross-linking with phosphorus compounds.

X is in particular alkali metals (eg sodium or potassium), alkaline earth metals (eg calcium or magnesium), ammonium salts, amine salts such as, for example, monoethanolamine, diethanolamine, triethanolamine, 3-amino-1,2- propanediol, or ammonium salts derived from basic amino acids such as lysine, arginine, sarcosine, ornithine or citrulline.

Phosphorus compounds can be, for example, sodium tripolyphosphate, sodium orthophosphate, phosphorus oxychloride or sodium trimetaphosphate.

Preferably, distarch phosphates or compounds enriched in distarch phosphate should be used, in particular hydroxypropyl esters of distarch phosphate having the INCI name: hydroxypropyl starch phosphate, for example products sold under the trademarks Farinex VA70 C or Farmal MS 689® by AVEBE Stadex; or products marketed under the trademarks Structure BTC®, Structure HVS®, Structure XL®, or STRUCTURE ZEA® by National Starch (corn distarch phosphate).

When the composition contains several substances, it includes one or more thickener(s), preferably polymeric thickeners, in the range from 0.1% wt. up to 10% wt., preferably in the range from 0.2% wt. up to 5% wt., based on the total weight of the composition.

Fillers

According to one particular form of the present invention, the composition of the present invention comprises at least one excipient other than the hydrophobic silica aerosol particles of the present invention.

It should be understood that the term "filler" means colorless or white, mineral or synthetic particles of any form, which are insoluble in the medium of the composition, regardless of the temperature at which the composition is prepared.

The composition according to the invention comprises a particulate phase comprising at least one filler other than the hydrophobic silica aerosol particles of the invention.

The fillers may in particular be organic particles and/or inorganic particles.

organic powders

Compositions according to this invention may also contain at least one organic powder. In this application, the term "organic powder" is intended to mean any organic solid that is insoluble in a medium at room temperature (25°C).

The term "organic powder" is meant to mean any compound or polymer whose chemical structure includes at least one or more carbon atom(s).

As organic powders that can be used in the composition according to this invention, examples that can be mentioned include polyamide particles and, in particular, those sold under the trademark Orgasol® by Atochem; polyethylene powders; microspheres based on acrylic copolymers, such as those obtained from a copolymer of ethylene glycol dimethacrylate and lauryl methacrylate, manufactured by Dow Corning under the trademark Polytrap®; polymethyl methacrylate microspheres available under the tradename Microsphere M-100® from Matsumoto or under the tradename Covabead LH85® from Wackherr; powder copolymers of ethylene and acrylate, such as those sold under the trademark Flobeads® by Sumitomo Seika Chemicals; "expanded" powders, such as hollow microspheres, and, in particular, microspheres formed from a terpolymer of vinylidene chloride, acrylonitrile and methacrylate and sold under the trade name Expancel® by Kemanord Plast under the names 551 DE 12® (particle size of about 12 microns and mass per unit volume is 40 kg/m ³ ), 551 DE 20® (particle size of approximately 30 μm and mass per unit volume is 65 kg/m ³ ), 551 DE 50® (particle size of approximately 40 μm), or microspheres, marketed under the trademark Micropearl F 80 ED® by Matsumoto; natural organic powders such as starch powders, especially crosslinked or non-crosslinked corn, wheat or rice starch, octenylsuccinic anhydride crosslinked starch sold under the trademark Dry-Flo® by National Starch; silicone resin microballoons, such as those sold under the trademark Tospearl by Toshiba Silicone, especially Tospearl 240; powdered amino acids such as powdered lauroyllysin sold under the trademark Amihope LL-11® by Ajinomoto; wax microdispersion particles, which preferably have an average size of less than 1 µm, and in particular in the range from 0.02 µm to 1 µm, and which are formed essentially from wax or a mixture of waxes, such as products marketed under trademark Aquacer by Byk Cera, and in particular: Aquacer 520 (mixture of synthetic and natural waxes), Aquacer 514® or Aquacer 513® (polyethylene wax), Aquacer 511® (polymeric wax), or as for example products marketed under the brand name Jonwax 120 from Johnson Polymer (a mixture of polyethylene wax and paraffin wax) and under the trademark Ceraflour 961® from Byk Cera (micronized modified polyethylene wax); and their mixtures.

Inorganic powders

The term "inorganic powder" is meant to mean any compound or polymer whose chemical structure does not include a carbon atom.

As an example of an inorganic powder, porous spherical silica particles having an average particle size in the range of 0.5 µm to 20 µm and in particular 3 µm to 15 µm can be mentioned.

As used herein, the term "spherical particles" is intended to mean medium sized, spherical or substantially spherical particles that are insoluble in the medium of the composition of this invention, even at the melting temperature of the medium (about 100°C).

Preferably, these particles have a specific surface area in the range from 50 m ² /g to 1000 m ² /g, and in particular from 150 m ² /g to 800 m ² /g. Preferably, these particles have a specific pore volume in the range from 0.5 ml/g to 5 ml/g, and in particular from 1 ml/g to 2 ml/g.

As an example of porous silica microballoons, the following commercially available products can be used:

Silica Beads SB 150 manufactured by Myoshi;

Sunsphere H-51 manufactured by Asahi Glass;

Sunsil 130 manufactured by Sunjin;

Spherica P-1500 manufactured by Ikeda Corporation;

Sylosphere manufactured by Fuji Silysia.

You can also specify lamellar inorganic particles such as talcs, micas or mother-of-pearl, and mixtures thereof.

Talcs are hydrous magnesium silicates, usually containing aluminum silicate. The crystal structure of talc consists of repeating layers of bruscite sandwich between layers of silica.

More specifically, the lamellar particles should be selected from talcs.

Advantageously, talc is used as lamellar particles in the composition according to the invention, such as those sold under the trademarks Rose Talc and Talc SG-2000 by Nippon Talc; mica, such as products sold under the trademarks Mica M RP and Silk Mica by Merck; titanium oxide coated micas, such as the product mica/titanium oxide/brown iron oxide (CTFA: mica/iron oxides/titanium dioxide) available under the tradename Cloisonne Rouge Flambe 440 X from Engelhard.

Among the inorganic powders, pearlite particles and preferably expanded pearlite particles can be mentioned.

The perlites that can be used according to the invention are usually aluminosilicates of volcanic origin and have the composition:

70.0-75.0% wt. silicon dioxide, SiO ₂ ;

12.0-15.0% wt. aluminum oxide, Al ₂ O ₃ ;

3.0-5.0% sodium oxide, Na ₂ O;

3.0-5.0% potassium oxide, K ₂ O;

0.5-2% iron oxide, Fe ₂ O ₃ ;

0.2-0.7% magnesium oxide, MgO;

0.5-1.5% calcium oxide, CaO;

0.05-0.15% titanium oxide, TiO ₂ .

Perlite is crushed, dried and then sized in the first stage. The resulting product, known as "pearlite ore", is gray in color and has a size of the order of 100 µm.

The perlite ore is then expanded (1000° C./2 sec) to produce more or less white particles. When the temperature reaches 850-900°C, the water retained in the structure of the material evaporates and the material expands in relation to its original volume. Expanded perlite particles according to this invention can be obtained by the process of expansion described in US patent No. 5002698.

Preferably, the perlite particles used should be pulverized; in this case, the particles are known as Expanded Milled Perlite (EMP). Preferably, they have a particle size defined by an average diameter D ₅₀ in the range from 0.5 µm to 50 µm, and preferably from 0.5 µm to 40 µm.

Preferably, the perlite particles used have a ramming density at 25° C. in the range from 10 kg/m ³ to 400 kg/m ³ (DIN 53468 standard) and preferably from 10 kg/m ³ to 300 kg/m ³ .

Preferably, the expanded perlite particles of the present invention have a water absorption capacity, measured at the moisture point, in the range of 200% to 1500%, and preferably 250% to 800%.

The moisture point corresponds to the amount of water that must be added to 1 g of particles in order to obtain a homogeneous paste. This method derives directly from the oil absorption method applied to solvents. The measurements are carried out in the same way by means of the moisture point and the pour point, which have, respectively, the following definitions:

moisture point: weight, expressed in grams, per 100 g of product, corresponding to the production of a homogeneous paste during the addition of the solvent to the powder;

pour point: weight, expressed in grams, per 100 g of the above product, the amount of solvent in which is greater than the ability of the powder to hold it. This results in a more or less homogeneous mixture which spreads over the glass plate.

The moisture point and the pour point are determined according to the following protocol.

Water absorption protocol

1) Equipment used

Glass plate (25 mm × 25 mm);

Spatula (wooden handle and metal part, 15 mm × 2.7 mm);

Brush with silk bristles;

Scales.

2) Methodology

The glass plate is placed on a balance and 1 g of perlite particles are weighed. The beaker containing the solvent and the liquid sampling pipette are placed on the balance. The solvent is gradually added to the powder, everything is mixed regularly (after every 3-4 drops) with a spatula.

Note the mass of solvent required to obtain the moisture point. Further solvent is added and the mass is noted which allows the pour point to be reached. The average of the three tests must be determined.

In particular, expanded perlite particles sold under the trademarks Optimat 1430 OR® and Optimat 2550® by World Minerals or those sold under the trademark GK-110 Extra Thin® by Langfang Xindazhong Filter should be used.

Pigments

In addition to fillers, the particulate phase of the composition according to this invention may contain pigments.

It should be understood that the term "pigments" means mineral or organic particles which are insoluble in the liquid organic phase and which are intended to color and/or haze the composition.

The pigments may be mineral or organic pigments. Pigments that can be used include metal oxides, for example iron oxides (especially yellow, red, brown or black iron oxides), titanium dioxide, cerium oxide, zirconium oxide, chromium oxide; manganese violet, ultramarine blue, Prussian blue and ferrous blue, and mixtures thereof.

Preferably, pigments based on iron oxide or titanium dioxide are used.

The compositions use inorganic fillers and/or organic fillers according to the present invention, in concentrations, preferably in the range from 0.1% of the mass. up to 10% wt., based on the total weight of the composition, and, in particular, from 0.2% wt. up to 5% wt.

Dyes

In addition to fillers and pigments, the particulate phase according to the invention may contain dyes.

The composition according to this invention may also contain water-soluble or fat-soluble colorants.

It should be understood that the term "fat-soluble colorants" means compounds, usually organic, that are soluble in fatty substances such as oils.

Fat soluble colors are, for example, Sudan red, D&C Red #17, D&C Green #6, β-carotene, soybean oil, Sudan Brown, D&C Yellow #11, D&C Violet #2, D&C Orange #5, quinoline yellow, annatto and bromine acids.

Galenic forms

The composition according to the invention may be in the form of a more or less viscous liquid such as a serum, gel, cream or paste. It can be dispensed into a tube, a device made with a distribution grid; the shape of a ball applicator (packed in a ball shape); a sealed non-aerosol form, for example a spray, and may contain, in this regard, ingredients commonly used in products of this type, which are well known to the person skilled in the art.

Example 1 (not according to the invention): Anhydrous soft solid according to International application WO2012/084522

Phase Name according to INCI (EU) Concentration A Aluminum/Zirconium Tetrahydroxychloride-GLY
calcium hydroxide 20
0.5 IN Silicon dioxide silylate (VM-2270® - Dow Corning) 2 C Dimethicone(s)
Dimethicone Crosspolymer (DC 9041® Dow Corning) 2 Hydrogenated polydecene 26.3 Butyl Ether PPG-14 2 Dimethicone 39.7 D Tribegenin 6 Triglyceride С ₁₈ -С ₃₆ -acids 1.5 Total: 100

Under a fume hood, the VM-2270® airgel is made into a paste (phase B) with a portion of the oil phase (phase C). The AZG complex is mixed with calcium hydroxide (phase A) using an Ultraturrax device in the remainder of the oil mixture (phase C).

Under heating conditions, in a Rainery mixer: the waxes are melted (phase D), then the airgel paste is added followed by the addition of the AZG/calcium hydroxide mixture dispersed in the oils. The mixture is heated to a temperature of 75°C and poured into containers. Carry out cooling to room temperature.

Example 2 (not according to the invention): Anhydrous deodorant roll-on according to International Application WO2012/084520

Name according to INCI Trademark Link % wt. Polydimethylsiloxane E (viscosity: 10 cSt) Dow Corning SH 200 C Fluid 10 CS® (Dow Corning) 35 Isopropyl myristate 21 Isopropyl palmitate Isopropyl palmitate (Cognis) 24 Polydimethylsiloxane E (viscosity: 350 cSt) Silicone Fluid 350CS® (Dow Corning) 9 Dimethicone(s)
Dimethiconol Dow Corning 1501 Fluid® (Dow Corning) 5 silica airgel VM-2270® (Dow Corning) 6

The hydrophobic silica airgel is dispersed in a mixture of other starting materials using an Ultraturrax device. A soft paste is obtained, which flows under the action of its own mass, and is packaged in roll-on applicators.

Example 3 Airgel Containing Gel (Invention)

Phase Name according to INCI (EU) Concentration A Sodium polyacrylate ⁽¹⁾ 1 Water up to 100 Glycerol 2 IN propylene glycol 40 Capryloylsalicylic acid ⁽³⁾ 0.3 Silicon dioxide silylate ⁽²⁾ 2 Denatured alcohol 4 ⁽¹⁾ Cosmedia SP® (Sensitive)
⁽²⁾ Airgel VM2270® (Dow Corning)
⁽³⁾ Mexoryl SAB® (Merck)

Preparation of phase A: sodium polyacrylate is added to a mixture of water and glycerol and stirred until a homogeneous gel is obtained.

Preparation of phase B: propylene glycol, silica silylate, alcohol and capryloylsalicylic acid are mixed until a homogeneous phase is obtained. Using a Rainery mixer and under cooling conditions, phase B is added to phase A and the mixture is stirred until a colorless homogeneous composition is obtained.

sensory test

Comparative sensory test between the compositions in accordance with Examples 1, 2 and 3 was carried out using a group of 8 individuals. The results are presented in the table below.

Compound Feeling dry Feeling of freshness Feeling greasy Example 1 Soft Anhydrous Solid (not according to the invention) Dry Lack of freshness Bold Example 2: anhydrous roll-on (not according to the invention) Not dry Lack of freshness Very fatty Example 3: (invention) slightly dry Very fresh slightly greasy

Example 4 (invention)

Phase Ingredients Concentration A Hydroxypropyl Starch Phosphate ⁽¹⁾ 4 Water up to 100 Glycerol 2 Zinc pidolate ⁽³⁾ 1 IN propylene glycol 40 Silicon dioxide silylate ⁽²⁾ 2 Denatured alcohol 4 ⁽¹⁾ Zea Structure® (Akzo)
⁽²⁾ Airgel VM2270® (Dow Corning)
⁽³⁾ Zincidone® (Ucib)

Preparation of phase A: hydroxypropyl starch phosphate is added to a mixture of water, glycerol and zinc pidolate and the mixture is stirred until a homogeneous gel is obtained.

Preparation of phase B: propylene glycol, silica silylate and alcohol are stirred until a homogeneous phase is obtained.

Using a Rainery mixer and under cooling conditions, phase B is added to phase A and the mixture is stirred until a colorless homogeneous composition is obtained.

Example 5 (invention)

Phase Ingredients Concentration A Hydroxypropyl Starch Phosphate ⁽¹⁾ 4 Water up to 100 Glycerol 2 Aluminum hydrochloride ⁽²⁾ thirty IN propylene glycol 40 Silicon dioxide silylate ⁽³⁾ 2 Denatured alcohol 4 ⁽¹⁾ Zea Structure® (Akzo)
⁽²⁾ Aqueous 50 wt. Chlorudol 50® solution (Summerheis)
⁽³⁾ Airgel VM2270® (Dow Corning)

Preparation of phase A: hydroxypropyl starch phosphate is added to a mixture of water, glycerol and aluminum hydrochloride and the mixture is stirred until a homogeneous gel is obtained.

Preparation of phase B: propylene glycol, silica silylate and alcohol are stirred until a homogeneous phase is obtained.

Using a Rainery mixer and under cooling conditions, phase B is added to phase A and the mixture is stirred until a colorless homogeneous composition is obtained.

Example 6 (invention)

Phase Ingredients Concentration A Hydroxypropyl Starch Phosphate ⁽¹⁾ 4 Water up to 100 Glycerol 2 Calcium chloride ⁽²⁾ 9.5 IN propylene glycol 40 Silicon dioxide silylate ⁽³⁾ 2 Denatured alcohol 4

⁽¹⁾ Zea Structure® (Akzo)

⁽²⁾ Calcium chloride 2H ₂ O (Merck)

⁽³⁾ Airgel VM2270® (Dow Corning)

Preparation of phase A: hydroxypropyl starch phosphate is added to a mixture of water, glycerol and calcium chloride and the mixture is stirred until a homogeneous gel is obtained.

Preparation of phase B: propylene glycol, silica silylate and alcohol are stirred until a homogeneous phase is obtained.

Using a Rainery mixer and under cooling conditions, phase B is added to phase A and the mixture is stirred until a colorless homogeneous composition is obtained.

Claims (24)

1. A composition for application to a keratin material to reduce or prevent the formation of unpleasant body odors, comprising, in a cosmetically acceptable medium: a) water phase b) at least silylated hydrophobic silica airgel particles, c) at least one alcohol selected from the group consisting of propylene glycol, glycerol and mixtures thereof, and d) capryloylsalicylic acid as an active deodorant; where the above airgel particles of hydrophobic silicon dioxide are dispersed in the aqueous phase and their content is from 0.1% of the mass. up to 5% wt. based on the total weight of the composition, where the alcohol is present in an amount of 0.1% of the mass. up to 80% wt. based on the total weight of the composition And wherein the composition is not in the form of an oil/water emulsion. 2. The composition according to the previous claim, wherein the hydrophobic airgel particles have a specific surface area per unit mass (SM) in the range of 500 m ² /g to 1500 m ² /g, preferably 600 m ² /g to 1200 m ² /g and even better from 600 m ² /g to 800 m ² /g and have a size expressed as an average diameter (D[0.5]) in the range from 1 μm to 30 μm and/or an oil absorption capacity measured at the moisture point, in the range of 5 ml/g to 18 ml/g of particles, preferably 6 ml/g to 15 ml/g and even more preferably 8 ml/g to 12 ml/g. 3. The composition according to any one of the preceding claims, characterized in that the hydrophobic silica airgel particles have a size, expressed as an average diameter, in the range from 5 µm to 25 µm, even better from 5 µm to 20 µm, and even better from 5 µm to 15 µm. 4. The composition according to claim 1 or 2, wherein the hydrophobic silica airgel particles are hydrophobic silica particles modified on the surface with trimethylsilyl groups. 5. Composition according to claim 1 or 2, characterized in that the hydrophobic silica airgel particles have a packing density ρ in the range from 0.04 g/cm ³ to 0.10 g/cm ³ and preferably from 0.05 g/cm ³ to 0.08 g/cm ³ . 6. The composition according to claim 1 or 2, characterized in that the hydrophobic silica airgel particles have a specific surface area per unit volume SV in the range from 5 m ² /cm ³ to 60 m ² /cm ³ , preferably from 10 m ² / cm ³ to 50 m ² /cm ³ and even better from 15 m ² /cm ³ to 40 m ² /cm ³ . 7. The composition according to claim 1 or 2, characterized in that the alcohol is present in an amount of 1% of the mass. up to 60% wt. and preferably from 5% of the mass. up to 50% wt. based on the total weight of the composition. 8. The composition according to claim 1 or 2, characterized in that the aqueous phase is at least 90% of the mass. and preferably from 90% of the mass. up to 98% of the mass. based on the total weight of the composition. 9. Composition according to claim 1 or 2, characterized in that the composition additionally contains an antiperspirant selected from salts of aluminum and/or zirconium; complexes of zirconium hydroxychloride and aluminum hydroxychloride with an amino acid and preferably aluminum hydrochloride. 10. The composition according to claim 1 or 2, also containing at least one polymeric or non-polymeric thickener. 11. A composition according to claim 10, wherein the thickener is at least partially neutralized acrylic acid homopolymer, preferably sodium polyacrylate. 12. Composition according to claim 10, in which the thickener is selected from distarch phosphates or compounds enriched in distarch phosphate, in particular distarch phosphate hydroxypropyl esters. 13. Composition according to claim 1 or 2, characterized in that the composition is packed in a tube; in a spherical form or in a sealed non-aerosol form, such as a spray. 14. A method for cosmetically treating a keratin material to reduce or prevent the formation of unpleasant body odors associated with human perspiration, comprising applying to the surface of the treated keratin material at least one composition as defined in one of the preceding claims. 15. The method of claim 14 wherein body odor includes underarm odors. 16. The method of claim 15, wherein it is used to treat human perspiration.