WO2019096382A1

WO2019096382A1 - Clear hydro-alcoholic roll-on formulation

Info

Publication number: WO2019096382A1
Application number: PCT/EP2017/079407
Authority: WO
Inventors: Cecile Ratschow; Ana Karen ZAVALA RAYA; Gauthier Denis Pierre LAMBERT
Original assignee: Beiersdorf Ag
Priority date: 2017-11-16
Filing date: 2017-11-16
Publication date: 2019-05-23
Also published as: BR112020006993A2; MX2020003358A; BR112020006993B1

Abstract

The present invention belongs to the cosmetic field and relates to a clear cosmetic composition containing, based on the total weight of the cosmetic composition, at least one antiperspirant active ingredient, from 10% to 50% by weight of ethanol, from 1.0% to 5% by weight of a mixture consisting of at least one quaternary ammonium compound and at least one anionic surfactant.

Description

Clear hydro-alcoholic roll-on formulation

The present invention belongs to the cosmetic field and relates to a hydro-alcoholic antiperspirant composition. Due to the presence of a quaternary ammonium compound and an anionic surfactant clear hydro-alcoholic antiperspirant cosmetic compositions can be provided.

Antiperspirant products are commonly applied to the axillary region of the human body to prevent and/or reduce the sweat production. Technically this effect is achieved by antiperspirant active ingredients blocking the sweat glands. Most commonly, those antiperspirant active ingredients are specific aluminum salts, which polymerize and thereby block the entrance of the sweat gland. Here, it should be noted that such a blocking of the sweat glands is only temporarily. The aluminum salts, which are most commonly used as antiperspirant active ingredients, are water soluble such that normal sweat production usually removes the polymerized aluminum salts within 72 hours from the sweat glands. In addition, the aluminum salts may be removed by washing the axillary region with water.

Commercial antiperspirant products are mostly in form of an aerosol, a pump spray, a roll-on preparation, a cream or a stick. The popularity of these products varies depending on the region. For example, in Europe most markets are dominated by aerosol and roll-on preparations, whereby in North America customers prefer to use antiperspirant sticks.

Roll-on compositions are applied from a reservoir container via a rotatably mounted ball by rolling the ball over the human skin.

Generally, there are three basic technologies for the formulation of an antiperspirant composition to be applied with a roll-on dispenser.

Firstly, there are the antiperspirant compositions which are based on either an oil-in-water emulsion (O/W emulsion) or a water-in-oil emulsion (W/O emulsion). In O/W emulsions surfactants or emulsifiers, such as polyethylene glycol (PEG-40) stearate are utilized to emulsify an oil phase in an aqueous phase. The antiperspirant active aluminum salt is dissolved in the outer aqueous phase allowing the formulation to be a highly effective antiperspirant product. W/O emulsions are generally weaker in antiperspirant efficacy as the antiperspirant active aluminum salt are encapsulated in the oil phase. Additionally, due to the outer oil phase, the W/O emulsion often provides a sticky feeling upon application. Both kinds of emulsions often suffer disadvantages such that they often strongly leave white residues behind after application, have a tendency to micro-foaming and have stability problems. Furthermore, these kind of compositions often lack a fresh feeling after

application.

An alternative second approach to provide antiperspirant compositions to be applied with a roll-on applicator are products using the phase inversion temperature technology (PIT). To provide such microemulsion gels a suitable mixture of surfactants, oils and water is heated from 60°C to 90°C to give a W/O emulsion above the PIT. During cooling, the mixture shows phase inversion to give a white or transparent O/W emulsion gel. Therefore, PIT based microemulsion gels are one suitable approach if it is desirable to provide clear and transparent antiperspirant compositions. However, such compositions may suffer from stability problems, are more difficult to manufacture due to their complexity and lack a fresh feeling after application.

A third group of are antiperspirant compositions which provide an excellent antiperspirant efficiency are based on water/ethanol solutions (hydro-alcoholic solution) thickened with a water-soluble polymer such as hydroxyethyl cellulose. The advantage of these formulations is that they provide due to the high alcohol content a fresh sensation in the axilla and the composition dries quickly after application. Furthermore, the high alcohol content allows low levels, e.g. less than 2% by weight of the composition, of water insoluble lipophilic

compounds such as perfumes or oils to be dissolved in the formulations. Therefore, in contrast to the emulsion based formulations these compositions may be described as single phase products, containing no stable emulsified oil-phase. Hence, hydro-alcoholic

antiperspirant products containing high amounts of alcohol may appear to be a clear solution. In this way, the formulations are regularly perceived by the customer as textile-friendly and no white residues are expected to appear after application to the skin. A disadvantage of the high alcohol content is that these products may cause burning or irritating effects, if it is applied directly after shaving the axillary region. In another aspect, customers with sensitive skin may also be negatively affected by the high ethanol content. However, due to the presence of the low levels of perfumes and/or oils, a simple reduction of the ethanol content may lead to turbid formulations. Therefore, it remains desirable to provide clear hydro-alcoholic antiperspirant compositions, which have a reduced irritation potential upon application to sensitive skin and which appear to be a clear solution.

EP 0792635 A2 discloses hydro-alcoholic antiperspirant compositions containing about 57.6% by weight of ethanol. However, the compositions do not contain a quaternary ammonium compound and an anionic surfactant.

EP1 183003 A2 discloses antiperspirant compositions wherein the aluminum-zirconium or zinc salt is coated with a water-soluble surfactant. But, none of the disclosed formulations contain ethanol. Thus, the document does not concern hydro-alcoholic antiperspirant compositions.

It was now surprisingly found by the applicant that the compositions according to the present invention do not suffer the issues discussed above. It was particularly surprising that the cosmetic compositions according to the present invention show a significantly improved clarity of the composition.

The present invention is a cosmetic composition containing, based on the total weight of the cosmetic composition,

a) at least one antiperspirant active ingredient,

b) from 5% to 30% by weight of ethanol, and

c) from 1.0% to 5% by weight of a mixture consisting of

i. at least one quaternary ammonium compound and

ii. at least one anionic surfactant.

Therefore, another subject of the present invention is the use of a mixture consisting of at least one quaternary ammonium compound and at least one anionic surfactant to provide a clear cosmetic composition, which comprises in addition at least one antiperspirant active ingredient and from 5% to 30% by weight, preferably 10% to 20% by weight and most preferably 13% to 17% by weight of ethanol, based on the total weight of the cosmetic composition.

Still another subject of the present invention is the use of the cosmetic composition according to the invention to provide a clear antiperspirant product. Quaternary ammonium compound is the name for organic ammonium compounds with quaternary nitrogen atoms.

For the purpose of the present disclosure the term“mixture” describes a group of substances which are included in the cosmetic composition of the present invention. The term does not limit the discloser in a way that the components contained in the mixture have to be added as premix. The components can be added individually to the composition.

All the weight percentages (% by weight) given below are based, unless otherwise stated, on the total weight of the cosmetic composition. If ratios of certain components are disclosed in the following description, these ratios refer, unless otherwise stated, to weight ratios of the components.

Unless otherwise stated, all tests and measurements were performed under“normal conditions”. The term "normal conditions" refers to 20°C, 1013 hPa and a relative humidity of 50%.

For the purposes of the present disclosure, the term "free from" means that the proportion of the respective substance is less than 0.05% by weight. This ensures that entrainments or impurities with these substances are not included as "free from" according to the invention.

The term“skin” refers solely to human skin.

In terms of the present invention the level of clarity/clearness of a composition is rated by looking with the human eye through the composition and rating to which extend a distinct structure can unblemishedly been identified. The structure may be the letter A, printed in black with the font Arial, size 10. In order to evaluate the clarity/clearness of the composition, the composition is placed in a clear glass cuvette having a thickness of 2 cm. The printout is placed behind cuvette, such that the letter is viewed with the bare eye through 2 cm of the composition.

One group of preferred antiperspirant active ingredients, which is in accordance with the present invention, are aluminum salts, which may be selected from the following non limiting list:

Aluminum salts such as aluminum chloride, AICI₃, aluminum sulfate, AI₂(S0₄)₃ Aluminum chlorides of the empirical formula [Al₂(OH)_mCl_n], where m + n = 6 Aluminum chlorohydrate [Al₂(OH)₅ Cl] ^c H₂O Standard Al complexes: Locron P (Clariant), Micro-Dry (Reheis), ACH-331 (Summit), Aloxicoll PF 40 (Giulini). - Capitalized Al complexes: Reach 501 (Reheis), AACH 324 (Summit), AACH 7171 (Summit), Aloxicoll P (Giulini), Aloxicoll SD100

Aluminum sesquichlorohydrate [AI2(0H)_4,50II,5] * PhO - Standard Al complexes: Aluminum sesquichlorohydrate (Reheis), AACH 308 (Summit) - Capitalized Al complexes: Reach 301 (Reheis)

Aluminum chlorohydrate [A^OH^Ch] * H2O

Another group of preferred antiperspirant active ingredients, which can be included in the cosmetic compositions of the present invention, are aluminum-zirconium salts. These aluminum-zirconium salts may be selected from the following non-limiting list:

Aluminum / zirconium glycine trichlorohydrex [Al4Zr(OH)i3Cl3] * H2O Gly - standard Al/Zr complexes: Rezal 33GP (Reheis), AZG 7164 (Summit), Zirkonal P3G (Giulini) - Capitalized Al/Zr complexes: Reach AZZ 902 (Reheis), AAZG- 7160 (Summit), Zirkonal AP3G (Giulini)

Aluminum / zirconium glycine tetrachlorhydrex [Al4Zr(OH)i2Cl4] XH2O Gly - standard Al / Zr complexes: Rezal 36G (Reheis), AZG-368 (Summit), Zirkonal L435G (Giulini) - Capitalized Al / Zr complexes : Reach 908 (Reheis), AAZG-7167 (Summit), Zirkonal AP4G (Giulini)

Aluminum / zirconium glycine Pentachlorhydrex [Al8Zr(OH)23Cl5] ^x H2O Gly Aluminum / zirconium glycine Octachlorhydrex [Al8Zr(OH)2oCl8] ^x H2O Gly Glycin-free aluminum /zirconium salts

According to the present invention it is particularly preferred, if the at least one antiperspirant active ingredient is selected from the group consisting of aluminum chlorohydrate and aluminum sesquichlorohydrate. Most preferred is aluminum chlorohydrate.

Generally, it is preferred if the total quantity of the antiperspirant active ingredients is in the range from 5% to 15% by weight, more preferably 7.5% to 12.5% by weight, based on the total weight of the cosmetic composition.

In a first preferred embodiment of the present invention the cosmetic compositions contain aluminum chlorohydrate in a total quantity from 5% to 15% by weight, more preferred from 8% to 12.5% by weight, based in each case on the total weight of the cosmetic composition. According to the present invention it is further preferred, if the total quantity of ethanol is less than 30% by weight, more preferred less than 25% by weight, still more preferred less than 20% by weight and most preferred less than 17% by weight, based in each case on the total weight of the cosmetic composition. Thereby, it is also preferred if the total quantity of ethanol is at least 5% by weight, more preferred at least 10% by weight and most preferred at least 13% by weight, based in each case on the total weight of the cosmetic composition.

The cosmetic composition of the present invention contains additionally a mixture c) consisting of at least one quaternary ammonium compound and at least one anionic surfactant. The total quantity of the mixture c) in the cosmetic composition is in the range from 1.0% to 5% by weight, preferably 1.1 % to 4% by weight and more preferably 1.1% to 3% by weight, based in each case on the total weight of the cosmetic composition.

Suitable quaternary ammonium compounds which can be contained in the mixture c) are quaternary ammonium salts defined by the formula (I)

wherein Ri and R₂ stand for a hydrogen atom or an alkyl chain of 1 to 4 carbon atoms which are optionally substituted with one or more hydroxyl groups,

and wherein R₃ stands for a saturated or unsaturated, branched or non-branched alky chain of 1 to 24 carbon atoms,

or R₃ stands for R5CONH(CH₂)_y group, wherein R₅ is a saturated or unsaturated, branched or non-branched alkyl chain with 7 to 21 carbon atoms and y is an integer in the range from 1 to 4,

or R₃ stands for R₆COO(CH₂)_z group, wherein Re stands for a saturated or unsaturated, branched or non-branched alkyl chain with 7 to 21 carbon atoms and z is an integer in the range from 1 to 4,

and wherein R₄ stands for a hydrogen atom or for a saturated or unsaturated, branched or non-branched alky chain of 1 to 24 carbon atoms,

or R₄ stands for a R5CONH(CH₂)_y or R₆COO(CH₂)_z group, wherein Rs, R₆, y and z have the same meaning as above, and A is an anion, preferably a methosulfate, ethosulfate, chloride or bromide.

Preferred examples of the above defined quaternary ammonium compounds are selected from the group consisting of octyltrimethylammonium chloride, decyltrimethylammonium chloride, dodecyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride,

tetramethylammonium chloride, tetraethylammonium chloride, palmitamidopropyltrimonium chloride, behenamidopropylethyldimonium ethosulfate, stearamidopropyltrimonium methosulfate, undecylamidopropyltrimonium methosulfate, cetylpyridinium chloride, octyldimethylbenzylammonium chloride, decyldimethylbenzylammonium chloride, stearyldimethylbenzylammonium chloride, didodecyldimethylammonium chloride and dioctadecyldimethylammonium chloride. The more preferred quaternary ammonium compounds are selected from the group consisting of palmitamidopropyltrimonium chloride, behenamidopropylethyldimonium ethosulfate, stearamidopropyltrimonium methosulfate and undecylamidopropyltrimonium methosulfate. Most preferred is palmitamidopropyltrimonium chloride, which is, for example, marketed under the trade name Varisoft PATC by the company Evonik.

Furthermore, it is particularly preferred if the anionic surfactant is laureth-7 citrate. Laureth-7 citrate can commercially be obtained under the trade name Plantapon LC 7, supplied by the BASF.

In a second preferred embodiment of the present invention the cosmetic composition contains, based on the total weight of the cosmetic composition,

a) at least one antiperspirant active ingredient,

b) from 5% to 30%, preferably 10% to 20% and more preferably 13% to 17% by weight of ethanol,

c) from 1.0% to 5%, preferably 1.1% to 4% and more preferably 1.1% to 3% by weight of a mixture consisting of

i. at least one quaternary ammonium compound selected from the group

consisting of octyltrimethylammonium chloride, decyltrimethylammonium chloride, dodecyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, tetramethylammonium chloride, tetraethylammonium chloride, palmitamidopropyltrimonium chloride, behenamidopropylethyldimonium ethosulfate, stearamidopropyltrimonium methosulfate,

undecylamidopropyltrimonium methosulfate, cetylpyridinium chloride, octyldimethylbenzylammonium chloride, decyldimethylbenzylammonium chloride, stearyldimethylbenzylammonium chloride,

didodecyldimethylammonium chloride and dioctadecyldimethylammonium chloride, and

ii. at least one anionic surfactant, preferably laureth-7 citrate.

Within the second preferred embodiment of the invention it is even more preferred, if the cosmetic composition contains, based on the total weight of the cosmetic composition, a) from 5% to 15% by weight of at least one antiperspirant active ingredient, b) from 10% to 20% and preferably 13% to 17% by weight of ethanol,

c) from 1.1% to 4%, preferably 1.1 % to 3% by weight of a mixture consisting of

i. at least one quaternary ammonium compound selected group consisting of palmitamidopropyltrimonium chloride, behenamidopropylethyldimonium ethosulfate, stearamidopropyltrimonium methosulfate and

undecylamidopropyltrimonium methosulfate, wherein

palmitamidopropyltrimonium chloride is most preferred, and

ii. at least one anionic surfactant, preferably laureth-7 citrate.

Within the second preferred embodiment of the invention it is most preferred, if the cosmetic composition contains, based on the total weight of the cosmetic composition,

a) from 5% to 15% by weight of at least one antiperspirant active ingredient, b) from 13% to 17% by weight of ethanol,

c) from 1.1% to 3% by weight of a mixture consisting of

i. palmitamidopropyltrimonium chloride, and

ii. laureth-7 citrate.

According to the present invention it is further preferred if the ratio by weight between the quaternary ammonium compounds (i.) and the anionic surfactants (ii.) is in the range from 2:1 to 1 :10, preferably 1 :1 to 1 :6.

Therefore, in a third preferred embodiment of the present invention the cosmetic composition contains, based on the total weight of the cosmetic composition,

a) at least one antiperspirant active ingredient,

c) from 1.0% to 5%, preferably 1.1% to 4% and more preferably 1.1% to 3% by weight of a mixture consisting of i. at least one quaternary ammonium compound selected from the group consisting of octyltrimethylammonium chloride, decyltrimethylammonium chloride, dodecyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, tetramethylammonium chloride, tetraethylammonium chloride, palmitamidopropyltrimonium chloride, behenamidopropylethyldimonium ethosulfate, stearamidopropyltrimonium methosulfate,

ii. at least one anionic surfactant, preferably laureth-7 citrate,

wherein the ratio by weight between the quaternary ammonium compounds (i.) and the anionic surfactants (ii.) is in the range from 2:1 to 1 :10, preferably 1 :1 to 1 :6.

Within the third preferred embodiment of the invention it is even more preferred, if the cosmetic composition contains, based on the total weight of the cosmetic composition, a) from 5% to 15% by weight of at least one antiperspirant active ingredient, b) from 10% to 20% and preferably 13% to 17% by weight of ethanol,

c) from 1.1% to 4%, preferably 1.1 % to 3% by weight of a mixture consisting of

undecylamidopropyltrimonium methosulfate, wherein

palmitamidopropyltrimonium chloride is most preferred, and ii. at least one anionic surfactant, preferably laureth-7 citrate,

wherein the ratio by weight between the quaternary ammonium compounds (i.) and the anionic surfactants (ii.) is in the range from 1 :1 to 1 :6.

Within the third preferred embodiment of the invention it is most preferred, if the cosmetic composition contains, based on the total weight of the cosmetic composition,

c) from 1.1% to 1.3% by weight of a mixture consisting of

i. palmitamidopropyltrimonium chloride, and

ii. laureth-7 citrate, wherein the ratio by weight between the palmitamidopropyltrimonium chloride and laureth-7 citrate is in the range from 1 :1 to 1 :6.

Furthermore, it was surprisingly noticed by the applicant that by limiting the quantity of the mixture c) to 1.5% by weight, based on the total weight of the composition, and choosing the ratio by weight between the palmitamidopropyltrimonium chloride and laureth-7 citrate in the range from 1 :1 to 1 :2, yellowish discolorations of the cosmetic composition can be reduced.

Therefore, a fourth preferred embodiment of the invention is characterized in that the cosmetic composition contains, based on the total weight of the cosmetic composition, a) at least one antiperspirant active ingredient,

b) from 10% to 20% and preferably 13% to 17% by weight of ethanol,

c) from 1.1% to 1.5% by weight, preferably from 1.15% to 1.5% by weight and most preferably 1.1% to 1.5% of a mixture consisting of

i. palmitamidopropyltrimonium chloride, and

ii. laureth-7 citrate,

wherein the ratio by weight between the palmitamidopropyltrimonium chloride and laureth-7 citrate is in the range from 1 :1 to 1 :2.

In the second and third preferred embodiment of the invention it is for the cases that the mixture c) consists of

i. at least one quaternary ammonium compound selected from the group

ii. laureth-7 citrate,

further preferred, if the cosmetic composition is free from any additional anionic and/or cationic surfactants. In addition, in the second and third preferred embodiment of the invention it is for the cases that the mixture c) consists of

undecylamidopropyltrimonium methosulfate and

ii. laureth-7 citrate,

further preferred, if the cosmetic composition is free from any additional anionic and/or cationic surfactants.

Finally, in the second, third and fourth preferred embodiment of the invention it is for the cases that the mixture c) consists of

i. palmitamidopropyltrimonium chloride, and

ii. laureth-7 citrate,

Moreover, the cosmetic compositions according to the invention are preferably therein characterized that they are free from nonionic and/or amphoteric surfactants. Thereby, it is explicitly preferred, if the cosmetic compositions according to the present invention contain less than 0.02% by weight, even more preferred less than 0.01% by weight and most preferred 0% of nonionic and/or amphoteric surfactants.

Moreover, the cosmetic compositions according to the invention are free from any emulsifier. Thereby, it is explicitly preferred, if the cosmetic compositions according to the present invention contain less than 0.02% by weight, even more preferred less than 0.01 % by weight and most preferred 0% of emulsifier.

The total quantity of water insoluble compounds, which are liquid at 20°C, is preferably in the range from 0.1% to 2% by weight and more preferably 0.5% to 1.5% by weight, based on the total weight of the cosmetic composition.

In terms of the present invention water insoluble means that after mixing the substance at 20°C with water two phase can be observed.

These liquids may be for example oils or perfumes. Due to the substantial absence of the emulsifier the cosmetic compositions according to the present invention are preferably therein characterized that they do not contain emulsified droplets of a second phase. The cosmetic compositions according to the present invention are preferably characterized in that they are a single phase product.

In addition, the cosmetic compositions according to the invention preferably contain glycerol in a total quantity from 0.5% to 3.5% by weight and more preferably from 0.8% to 3% by weight, based in each case on the total weight of the cosmetic composition. Experimental results have surprisingly indicated that by the addition of such an amount of glycerol to the cosmetic composition according to invention the clarity of the composition is not adversely affected.

In addition, preferred cosmetic compositions according to the present invention comprise propylene glycol in a total quantity from 0.25% to 0.5% by weight, based in each case on the total weight of the cosmetic composition.

In addition, the cosmetic compositions according to the present invention preferably contain at least one polysaccharide. These compounds allow for a quick drying of the composition upon application to the human skin. In terms of the present invention“polysaccharides” are understood as the general term for macromolecular carbohydrates whose molecules are made up of at least 10, but usually considerable more monosaccharide molecules glycosidically linked to one another. According to the invention, the term polysaccharides includes modified and unmodified polysaccharides.

One group of polysaccharides preferred according to the invention are cellulose and chemically modified cellulose derivatives, which are preferably selected from the group consisting of methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose,

hydroxypropylmethyl cellulose, hydroxypropylethyl cellulose, hydroxyethylmethyl cellulose, and carboxymethyl cellulose.

Another group of polysaccharides preferred according to the invention are starches, which are preferably selected from the group consisting of corn starch, potato starch, and wheat starch, their constituents such as amylose and amylopectin, starch hydrolysates and starch degradation products such as maltodextrin, the physically or chemically modified starch derivatives, in particular the anionic starch derivatives aluminum starch octenylsuccinate, sodium starch octenylsuccinate, calcium starch octenylsuccinate, distarch phosphates, hydroxyethyl starch phosphates, hydroxypropyl starch phosphates, sodium carboxymethyl starches and sodium starch glycolate.

According to the invention it is preferred, if the cosmetic compositions contain at least one anionic and/or nonionic polysaccharide, whereby the nonionic polysaccharides are most preferred.

Among those nonionic polysaccharides the ones selected from the group consisting of methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxypropylmethyl cellulose, hydroxypropylethyl cellulose, hydroxyethylmethyl cellulose and carboxymethyl cellulose are in particular preferred. Most preferred is hydroxyethyl cellulose.

Thereby, it is preferred, if the total quantity of the polysaccharides, especially of the polysaccharides, which were disclosed above as the preferred and most preferred ones, is in the range from 0.1 % to 1 % by weight, more preferably 0.25% to 0.6% by weight and most preferably 0.3% to 0.48% by weight, based in each case on the total weight of the cosmetic composition.

Additionally, it is preferred if the cosmetic compositions according to the invention contain water in a total quantity in the range from 55% to 90% by weight, more preferably 65% to 75% by weight, based in each case on the total weight of the cosmetic composition.

The cosmetic compositions of the present invention are intended to be applied to the human skin using a roll-on dispenser, such as known from commercial antiperspirant products. A typical example is the Nivea Stress Protect product known under the Mintel GNPD number 786819. For optimum dispensing properties the cosmetic compositions have preferably a viscosity, which is neither too low nor too high. Therefore, it was found that preferred cosmetic compositions of the present invention are therein characterized that they have a viscosity in the range from 200 to 800 mPa-s, preferably 300 to 500 mPa-s at 35°C. The viscosity of the cosmetic composition of the invention is determined at 35° C in a 150 ml beaker using a Rheomat R 123 by the company proRheo. The Rheomat R 123 is a rotational viscometer, i.e. a measuring body rotates in the substance to be measured. It measures the force required to rotate the measuring body in the sample at a predetermined speed. For this torque, the rotational speed of the measuring body and the geometric dimensions of the measurement system used, the viscosity is calculated. As a measuring body the

measurement bob 3 (Part no. 200 0193) at a rotational speed range of 62.5 min -1 is used. Examples:

The following examples should illustrate the compositions of this invention, without intending to limit the invention to these examples. The numerical values in the examples are percentages by weight, based on the total weight of the preparations.

In order to provide an indication of the beneficial aspects of the present invention a set of comparative studies have been carried out. All investigated example compositions are presented in the following table.

Com = Comparative example, not according to the invention

Inv = Inventive example, according to the invention

^{1 )} Varisoft PATC from Evonik, 60% by weight Palmitamidopropyltrimonium Chloride and 40% by weight Propylene Glycol.

The viscosity of the example Inv. 1 was determined to be 350 mPa-s at 35°C.

In addition to the clarity rating disclosed in the table above, pictures of the compositions are included in the figure 1. It can be noted that the compositions according to the invention are clearer than the one of the comparison examples.

Claims

1. Cosmetic composition containing, based on the total weight of the cosmetic

composition,

a) at least one antiperspirant active ingredient,

b) from 5% to 30% by weight of ethanol,

c) from 1.0% to 5.0% by weight of a mixture consisting of

i. at least one quaternary ammonium compound, and

ii. at least one anionic surfactant.

2. Cosmetic composition according to claim 1 characterized in that the at least one antiperspirant active ingredient is selected from the group consisting of aluminum chlorohydrate and aluminum sesquichlorohydrate, whereby aluminum chlorohydrate is preferred.

3. Cosmetic composition according to any of the claims 1 to 2 characterized in that the total quantity of the antiperspirant active ingredients is in the range from 5% to 15% by weight, more preferably 7.5% to 12.5% by weight, based on the total weight of the cosmetic composition.

4. Cosmetic composition according to any of the claims 1 to 3 characterized in that the total quantity of the mixture c) is in the range from 1.1 % to 4% by weight, preferably 1.1 % to 3% by weight, based on the total weight of the cosmetic composition.

5. Cosmetic composition according to any of the claims 1 to 4 characterized in that the quaternary ammonium compound is selected from the group consisting of palmitamidopropyltrimonium chloride, behenamidopropylethyldimonium ethosulfate, stearamidopropyltrimonium methosulfate and undecylamidopropyltrimonium methosulfate.

6. Cosmetic composition according to claim 5 characterized in that

palmitamidopropyltrimonium chloride is contained as quaternary ammonium compound.

7. Cosmetic composition according to any of the claims 1 to 6 characterized in that the anionic surfactant contained in the mixture c) is laureth-7 citrate.

8. Cosmetic composition according to any of the claims 1 to 7 characterized in that the ratio by weight between the quaternary ammonium compounds (i.) and the anionic surfactants (ii.) is in the range from 2:1 to 1 :10, preferably 1 :1 to 1 :6.

9. Cosmetic composition according to claim 6 and 7 characterized in that the quantity of the mixture c) is limited to 1.5% by weight, based on the total weight of the composition, and the ratio by weight between the palmitamidopropyltrimonium chloride and laureth-7 citrate in the range from 1 :1 to 1 :2.

10. Cosmetic composition according to any of the claims 1 to 9 characterized in that the composition is free from nonionic and/or amphoteric surfactants.

1 1. Cosmetic composition according to any of the claims 1 to 10 characterized in that the composition free from any emulsifier.

12. Cosmetic composition according to any of the claims 1 to 1 1 characterized in that the total quantity of water insoluble compounds, which are liquid at 20°C, is in the range from 0.1% to 2% by weight, preferably from 0.5% to 1.5% by weight, based on the total weight of the cosmetic composition.

13. Cosmetic composition according to any of the claims 1 to 12 characterized in that the composition contains polysaccharides in a total quantity in the range from 0.1 % to 1 % by weight, more preferably 0.25% to 0.6% by weight and most preferably 0.3% to 0.48% by weight, based on the total weight of the cosmetic composition.

14. Cosmetic composition according to any of the claims 1 to 13 characterized in that the total quantity of ethanol is less than 25% by weight, more preferred less than 20% by weight and most preferred less than 17% by weight, based on the total weight of the cosmetic composition.

15. Cosmetic composition according to any of the claims 1 to 14 characterized in that the total quantity of ethanol is at least 10% by weight, more preferred at least 13% by weight, based on the total weight of the cosmetic composition.

16. Use of a mixture consisting of at least one quaternary ammonium compound and at least one anionic surfactant to provide a clear cosmetic composition, which comprises in addition to the mixture at least one antiperspirant active ingredient from 5% to 30% by weight, preferably 10% to 20% by weight and most preferably 13% to 17% by weight of ethanol, based on the total weight of the cosmetic composition.