EP3793509A1

EP3793509A1 - Method for reducing perspiration with malonic acid

Info

Publication number: EP3793509A1
Application number: EP19719179.4A
Authority: EP
Inventors: Frank Lehmbeck; Robert Klauck
Original assignee: Beiersdorf AG
Current assignee: Beiersdorf AG
Priority date: 2018-05-17
Filing date: 2019-04-10
Publication date: 2021-03-24
Also published as: WO2019219300A1; DE102018207702A1

Abstract

The invention relates to a kit comprising at least two cosmetic partial preparations, wherein a first partial preparation comprises at least one alkali metal silicate and a second partial preparation comprises at least malonic acid.

Description

Process for sweat reduction with malonic acid

The present invention relates to a method for reducing or preventing the formation of perspiration by application of two cosmetic part preparations, characterized in that the period between mixing of the part preparations and

Application of the mixture to the skin is not more than five minutes, and wherein the first part preparation comprises an alkali metal silicate and the second part preparation contains malonic acid.

Sweat is an aqueous secretion secreted by the skin of the human through the so-called sweat glands. There are three types of sweat glands in the skin, namely apocrine, eccrine, and apoekrine sweat glands (Int J Cosmet Sei. 2007 Jun; 29 (3): 169-79).

The eccrine sweat glands in humans are distributed practically throughout the body and can produce significant amounts of a clear, odorless secretion that is over 99% water. In contrast, the apocrine sweat glands come only in the hairy body areas of the armpit and genital region and the

Nipples before. They produce small amounts of a milky secretion that contains proteins and lipids and is chemically neutral.

Cosmetic antiperspirants or deodorants / deodorants serve to

To eliminate body odor or to reduce its formation. Body odor arises when the per se odorless fresh sweat by microorganisms such.

Staphylococci and Corynebacteria is decomposed.

In common usage, there is not always a clear distinction between the terms "deodorant" and "antiperspirant". Rather, especially in the

German-speaking countries - products for use in the armpit area as a whole

Desodorants or "Deodorant". This is irrelevant to the question of whether an antiperspirant effect is present. Antiperspirants (AT) are antiperspirants that - in contrast to the

Deodorants, which generally prevent microbial decomposition of already formed sweat - to prevent the secretion of sweat at all.

In contrast to the antiperspirants pure deodorants cause no active

Influencing the sweat secretion, but only the control or influence of the body or armpit odor (odor control agent). The usual cosmetic deodorants are based on different active principles.

The classic antiperspirants used are, in particular, aluminum salts or aluminum / zirconium salts. These inhibit the flow of sweat by obstructing the excretory ducts of the sweat glands by precipitating them together with the skin's own proteins and thus leading to so-called plugs. Therefore, there may be a congestion of sweat within the gland.

A disadvantage of the aluminum salts used hitherto for sweat inhibition is the currently not yet fully understood long-term toxicity. Aluminum has long been suspected of promoting or inducing neurodegenerative diseases such as dementia, particularly Alzheimer's disease. Also, aluminum is associated with the onset of breast cancer

Connected. So far, there is no reliable evidence that skin-acting aluminum-containing AT agents are involved. In intact skin, however, the maximum allowable intake levels can not be achieved.

In view of the data, however, the move away from aluminum-containing AT agents is advantageous, so that the industry is desperately looking for aluminum-free alternatives.

Because of this problem, it is desirable to provide products that achieve a particularly effective antiperspirant effect without the use of Al salts.

From FR 2977151 the use of alkaline silicates as an antiperspirant active ingredient is known. The disclosed preparations contain, in addition to the alkaline silicates

Citric acid, phytic acid or maleic acid.

Furthermore, DE 102015226630 A1 discloses a method of reducing or preventing the development of apothecary sweat by applying a mixture of two cosmetic part preparations, characterized in that the time between mixing of the part preparations and application of the mixture to the skin is not more than five minutes and wherein one Part preparation one or more silicates (1st phase) and the second part preparation contains one or more pH regulators. The pH regulators are selected from a group of buffer systems which according to the

Disclosure on page 6, paragraph [0061] a substance of the group citric, lactic, tartaric, fatty, phosphoric, phosphonic, polyacrylic, succinic, malic, oxalic and amino acids.

However, DE 102015226630 A1 does not disclose the use of malonic acid. Furthermore, DE 102015226630 A1 still FR 2977151 indicate that certain acids can further increase the antiperspirant activity of the alkaline silicates.

It was therefore amazing that by means of separate provision of a first

Partial preparation containing alkali metal silicates and a second part preparation containing malonic acid in a two-chamber packaging, wherein the first part of preparation are mixed with the second part only shortly before or during the issue and / or application, significantly more effective in terms of their sweat-reducing effect than when using the Compositions of the prior art with other acids is the case.

The invention is therefore a method for reducing or preventing the

Characterized in that two cosmetic partial preparations are mixed and the mixture is applied to the skin, wherein the time between mixing of the partial preparations and application of the mixture to the skin is not more than five minutes and wherein the first part preparation at least one

Contains alkali metal silicate and the second part of the preparation contains malonic acid.

The invention is also a cosmetic product having a

Two-chamber container suitable for the application of cosmetic preparations, characterized in that a chamber contains a first part preparation containing at least one alkali metal silicate, and the second chamber contains a second part preparation containing malonic acid, wherein in the application, the contents of the first and second chambers simultaneously be taken from the chambers and the first and second

Mix part preparation at output or just before output.

The invention also relates to a kit comprising at least two cosmetic

Partial preparations, wherein a first part preparation comprises at least one alkali metal silicate and a second part preparation at least malonic acid. Advantageously, the first and second part preparation are stored separately in two different chambers and for The time between mixing of the partial preparations and application of the mixture to the skin is preferably not more than five minutes.

Another object of the present invention is also the use of the product according to the invention for reducing or preventing the formation of perspiration, characterized in that the mixture of the first and second part of the preparation is applied to the skin within 5 minutes after mixing.

In the present disclosure, if part preparations or mixtures are mentioned, they are in any case cosmetic preparations or mixtures.

All effects described and any disclosure always refer to the

human skin.

In connection with the method according to the invention, it is postulated that in the mixture of the part preparations, the silicon compounds continue to be present as silicates. Depending on the pH of the mixture, however, it is also possible for silicic acids to be present.

Silica is a very weak acid with a pKs1 = 9.51; pKs2 = 11, 74. That is, in the pH range according to the invention, the 'silicon' is present predominantly as silica and only slightly as silicate.

The mixtures prepared by this process are only stable for a short time, which is why it is necessary to use this AT formulation directly after mixing. If the mixture is not fast enough or the application is too late, then it may lead to a polymerization of the silica (gelation). The resulting gel has no sweat-reducing effect when applied to the skin.

In the context of the invention, the antiperspirant effect is the possibility of reducing or preventing the formation of perspiration or a reduction in Switzerland. That the mixtures obtained according to the invention act as a sweat inhibitor and reduce perspiration. As a result of this effect, a reduction of the distinctive odor of sweat also takes place indirectly.

Advantageously, according to the invention, the mixture of the first part preparation and the second part preparation is applied from a multichamber container, wherein a first chamber of the multichamber container contains the first part preparation and a second chamber of the multichamber container contains the second part preparation. According to the invention, the first part preparation contains at least one alkali metal silicate, preferably sodium silicate and / or potassium silicate, with sodium silicate being particularly preferred.

The substances are understood _x Si0 ₂ -yHhO having the empirical formula Na ₂ 0 According to the invention under Natriumsilkat, wherein x = 1 and y = 0 to. 9

According to the invention, the first part preparation advantageously contains water in addition to the alkali metal silicates according to the invention. If aqueous alkali metal silicate solutions are used, it is advantageous according to the invention if the proportion of alkali metal silicates is chosen so that the proportion of S1O2 from the general formula M2O _X S1O2 -yFhO, where M is an alkali metal, is x = 1 and y = 0 to 9, in the mixture of the first and second part of preparation 0.5 wt .-% to 8 wt .-%, preferably 1 wt .-% to 6 wt .-% and particularly preferably, 2 wt .-% to 5 wt .-%, based on the total weight of the mixture of the first and second part of the preparation.

The content of alkali metal silicates is given and calculated in accordance with the invention as described above as the content of S1O2, since the silicon is not uniform

Compound occurs in the phases and in the mix. The Si0 ₂ content can be determined gravimetrically very easily, eg by ashing.

The alkali metal silicates, in particular sodium silicate, can be obtained commercially either in solid, crystalline form or already as an aqueous solution. Alkaline-aqueous solutions of sodium silicate are commercially available from Honeywell under product number 338443 (sodium silicate solution, reagent grade). This watery

Sodium silicate solution has a Si0 ₂ content of 26.5 wt .-%, based on the

Total weight of the sodium silicate solution.

The first part preparation according to the invention advantageously has a pH of> 10, preferably> 10.5, more preferably> 11 and especially preferably> 1.5.

According to the invention, the second part preparation contains malonic acid. Besides malonic acid, other acids may advantageously be present in the second part preparation. However, it has been shown that a particularly efficient sweat reduction takes place when the second

Part preparation in addition to malonic acid further acids only in a proportion of up to 0.5% by weight based on the total weight of the second part preparation. It is accordingly According to the invention preferred if the second part preparation in addition to malonic acid contains further acids only in a proportion of up to 0.5 wt .-% based on the total weight of the second part of the preparation or no other acids.

Furthermore, it is according to the invention advantageous if the second part of a preparation

Buffer system of bases and acids, wherein the acid is at least the malonic acid contained in the second part of the preparation.

The buffer systems may be bases, advantageously selected from the group consisting of 2-aminobutanol, 2- (2-aminoethoxy) ethanol, aminoethyl propanediol, aminomethyl propanediol, aminomethyl propanol, aminopropanediol, bis-hydroxyethyl tromethamine, butyl diethanolamine, butyl ethanolamine, dibutyl ethanolamine, diethanolamine, diethyl ethanolamines,

Diisopropanolamines, dimethylamino methylpropanol, dimethyl isopropanolamines, dimethyl MEA, ethanolamines, ethyl ethanolamines, isopropanolamines, methyl diethanolamines, methylethanolamines, triethanolamines, triisopropanolamines, tromethamines,

Polyethyleneimines, tetrahydroxypropyl ethylenediamine and / or ammonia.

An adjustment of the pH of the second part of the preparation is also possible with sodium hydroxide advantageous.

Furthermore, it is advantageous if the second part preparation has a pH in the range from a pH of 1.5 to 5, preferably 2 to 4 and particularly preferably 2.5 to 3.

The proportion of malonic acid in the second part preparation is advantageously from 2.5% by weight to 12% by weight, preferably from 3.5% by weight to 9% by weight and particularly preferably from 5% by weight to 8 wt .-%, each based on the total weight of the second part preparation.

Advantageous embodiments of the invention are characterized in that the mixing ratio of the first part preparation to the second part preparation based on their weight fractions 10: 1 to 1: 10, preferably 5: 1 to 1: 5, more preferably 2: 1 to 1: 2 and particularly preferred 1, 2: 1 to 1: 1, 2. If these proportions by weight of the two partial preparations are used, a light and uniform mixing of the partial preparations takes place. A temporally uniform polymerization / gel formation within all subregions of the mixture produced is thus ensured. This avoids that the gelation in some parts of the mixture is faster or slower than in other areas. As a result, uniform sweat reduction is achieved when the mixture is applied to a larger area of the skin. It avoids being in Some skin areas achieve a better or worse sweat reduction than in other skin areas.

Furthermore, advantageous embodiments of the invention are characterized in that the proportions of the alkali metal silicates in the first part preparation and the proportions of the acids, in particular of the malonic acid, and the optionally contained bases in the second

Partial preparation are selected so that the mixture of the first and second part of the preparation has a pH between 3.5 and 8, preferably between 4 and 5.7 and more preferably between 4.3 and 5.3. Within these embodiments, the proportion of S1O2 of the general formula M2O _{X is} S1O2 -y ^ O, where M is an alkali metal, x is 1 and y is 0 to 9, advantageously 0.5 to 8 wt .-%, preferably 1 wt .-% to 6 wt .-% and particularly preferably, 2 wt .-% to 5 wt .-% based on the total weight of the mixture of the first and second part of the preparation.

Accordingly, by the mixture of the first part preparation and the second part preparation is advantageously carried out an adjustment of the pH of the resulting mixture to a pH between 3.5 and 8, preferably between 4 and 5.7 and more preferably between 4.3 and 5.3.

In addition, the first part preparation and the second part preparation may contain further ingredients customary for cosmetic preparations, such as perfume, rheology modifiers, solubilizers, conditioners, dyes, skin care components.

Advantageously, one or both of the part preparations contain stabilizers which are the

Delay polymerization on the skin.

The stabilizers are advantageously chosen

group A: hexenol cis 3 (CAS 928-96-1), terpineol (CAS 8000-41-7), linalool (CAS 78-70-6), tetrahydrolinalool (CAS 78-69-3), triethyl citrate (CAS 77-93-0), 2-isobutyl-4-hydroxy-4-methyltetrahydropyran (CAS 63500-71-0), hexyl salicylate (CAS 6259-76-3), phenylethyl alcohol (CAS 60-12-8), 3 Methyl 5-phenyl-1-pentanol (CAS 55066-48-3), 2,6-dimethyl-7-octen-2-ol (CAS 18479-58-8), benzyl salicylate (CAS 1 18-58- 1), geraniol (CAS 106-24-1), citronellol (CAS 106-22-9) and ethyllinalool (CAS 10339-55-6);

Group B: alcohols and diols and

Group C: Substances with at least three hydroxyl groups. Particularly advantageous stabilizers from group A are: linalool (CAS 78-70-6), benzyl salicylate (CAS 1 18-58-1), geraniol (CAS 106-24-1) and citronellol (CAS 106-22-9 ). Particularly advantageous group B stabilizers are: ethanol, 2-propanol, PEG 8, triethylene glycol, methylphenylbutanol, decanediol, polyglyceryl-2-caprate, oxalic acid.

Particularly advantageous stabilizers from group C are: sucrose (mannose, mannitol), glycerol, pentaerythritol, threitol, erythritol, hyaluronic acid.

The topical application of mixtures of first and second part preparation containing stabilizers selected from the group A, B and / or C allows the reduction or prevention of stress sweating.

By lowering the pH of the silicate-containing preparation during or before application and application, preparations are provided which have a high physiological compatibility.

Preferably, the partial preparations of the process according to the invention or of the process-converting products comprise no further antiperspirant active substances or preparations, in particular no aluminum salts, in particular no ACH and / or AACH (activated aluminum chlorohydrate).

Process-converting products are products when used

inventive method is performed.

Another significant advantage of the process-converting products is that they show no discoloration on the skin or clothing compared with the AT agents based on aluminum salts. The so-called white is omitted as well as the after repeated wearing and washing in lying directly on the armpit skin to be observed residues.

The part preparations are preferably produced and used in an optically appealing transparent manner.

The first part preparation is advantageously characterized in that it is in the form of an aqueous or aqueous-alcoholic solution, or an anhydrous preparation. Advantageously, deodorants can also be added to the first and / or the second part preparation. The usual cosmetic deodorants are based on different active principles. By using antimicrobial substances as cosmetic deodorants, the bacterial flora on the skin can be reduced. Ideally, only the odor causing microorganisms should be effectively reduced. The sweat flow itself is not influenced by this, in the ideal case only the microbial decomposition of the sweat is temporarily stopped. The combination of astringents with antimicrobial substances in one and the same composition is also common.

All agents which are common as deodorants can be used to advantage, for example odor maskers such as the customary perfume ingredients, odor absorbers, for example the phyllosilicates described in DE 40 09 347, of these

in particular montmorillonite, kaolinite, mit, beidellite, nontronite, saponite, hectorite, bentonite, smectite, furthermore, for example, zinc salts of ricinoleic acid. Germ-inhibiting agents are also suitable for incorporation into the preparations according to the invention. Advantageous substances are, for example, 2,4,4'-trichloro-2'-hydroxydiphenyl ether (Irgasan), 1,6-di- (4-chlorophenylbiguanido) hexane (chlorhexidine), 3,4,4'-trichlorocarbanilide, quaternary ammonium compounds, clove oil, mint oil, thyme oil, triethyl citrate, farnesol (3,7,1-trimethyl-2,6,10-dodecatrien-1-ol), ethylhexylglycerol, phenoxyethynol, piroctone olamine,

Caffeine as well as in DE 37 40 186, DE 39 38 140, DE 42 04 321, DE 42 29 707, DE 42 29 737, DE 42 37 081, DE 43 09 372, DE 43 24 219 described effective agents. Also, sodium bicarbonate is advantageous to use.

Likewise, an antimicrobial silver citrate complex, as described in DE 202008014407, preferably be used as a deodorizing ingredient.

Preferably, the first and / or the second part of the preparation also contain polymers. The polymers are preferably from the range of celluloses, such as hydroxyethyl or hydroxypropylcellulose, the acrylic acid-containing polymers, such as carbomers, and / or

Polyvinylpyrrolidones. The polymers of the invention are advantageously hydrophobic or hydrophilic modified. They serve the viscosity adjustment of the phases and facilitate the pumpability and miscibility, as well as the drainage or distribution behavior on the skin.

In addition to water, ethanol and isopropanol, glycerol and propylene glycol, skin-care fat or fat-like substances and oils such as oleic acid decyl ester, cetyl alcohol, cetylstearyl alcohol and 2-octyldodecanol, which are customary for such preparations, can be used as conventional cosmetic ingredients of the second part preparation of the product according to the invention

Be contained in proportions. Furthermore, the second part preparation can advantageously one or more nonionic

Contain emulsifiers. Contains second part of the invention preparation nichtionische

Emulsifiers, these are advantageously selected from the group consisting of polyoxyethylene (20) sorbitan monolaurate, polyoxyethylene (20) sorbitan monopalmitate, polyoxyethylene (20) sorbitan monostearate, polyoxyethylene (20) sorbitan monooleate, sorbitan trioleate, polyglyceryl-10 Stearates, Polyglyceryl-4 Caprate, Lauryl Glucoside, Polyglyceryl-2 Dipolyhydroxyl Stearate, Polyglyceryl-10 Laurate, Polyglyceryl-4 Laurate, Decyl Glucoside, Propylene Glycol

Isostearates, glycol stearates), glyceryl isostearates), sorbitan sesquioleates, glyceryl

Stearates, Lecithin, Sorbitan Oleate, Sorbitan Monostearate NF, Sorbitan Stearate, Sorbitan Isostearate, Steareth-2, Oleth-2, Glyceryl Laurate, Ceteth-2, PEG-30 Dipolyhydroxystearate, Glyceryl Stearate SE, Sorbitan Stearate (and) Sucrose Cocoate, PEG 4 dilaurates, PEG-8 dioleates, sorbitan laurate, PEG-40 sorbitan peroleate, laureth-4, PEG-7 glyceryl cocoate, PEG-20 Almond glycerides, PEG-25 hydrogenated castor oil, stearamide MEA, glyceryl stearate + PEG-100 Stearates, Polysorbate 85, PEG-7 Olivate, Cetearyl Glucoside, PEG-8 Oleate, Polyglyceryl-3 Methyglucose Distearate, PG-10 Stearate, Oleth-10, Oleth-10 / Polyoxyl 10 Oleyl Ether NF, Ceteth-10, PEG-8 Laurate, Ceteareth-12, Cocamide MEA, Polysorbate 60 NF, Polysorbate 60, PEG-40 Hydrogenated Castor Oil, Polysorbate 80, Isosteareth-20, PEG-60 Almond Glycerides, Polysorbate 80 NF, PEG-150 Laurate, PEG-20 Methyl Glucose Sesquistearates, ceteareth-20, oleth-20, steareth-20, steareth-21, ceteth-20, isoceteth-20, PEG-30 glyceryl laurate, polyso rbate 20, Polysorbate 20 NF, Laureth-23, PEG-100 Stearate, Steareth-100 and PEG-80 Sorbitan Laurate.

Glyceryl isostearates, glyceryl stearates, steareth-2, ceteareth-20, steareth-21, PEG-40 hydrogenated castor oil, PG-10 stearates, isoceteth-20, isosteareth-20 and / or ceteareth-12 are preferably used as nonionic emulsifiers ,

If the second part preparation is a solution or emulsion or dispersion, it is possible to use as solvent, bodying agent and / or main active ingredients:

- water or aqueous solutions

Oils, such as triglycerides of capric or caprylic acid and alkyl benzoate,

but preferably cyclic silicone oils or volatile hydrocarbons;

- fats, waxes and other natural and synthetic fatty substances, preferably esters of fatty acids with low C-number alcohols, eg with isopropanol, propylene glycol or glycerol, or esters of fatty alcohols with lower C-number alkanoic acids or with fatty acids; Vegetable oils such as avocado oil, meadowfoam seed oil, Olive oil, sunflower oil, rapeseed oil, almond oil, evening primrose oil, coconut oil. Palm oil, linseed oil, shea butter.

Alcohols, diols or polyols of low C number, and their ethers, in particular propylene glycol, glycerol, ethylene glycol, ethylene glycol monoethyl or monobutyl ether, propylene glycol monomethyl, monoethyl or monobutyl ether, diethylene glycol monomethyl or monoethyl ether and analogous products.

Skin care substances, such as Panthenol, allantoin, urea,

Urea derivatives, guanidine, ascorbic acid, glyceryl glucose,

In particular, mixtures of the aforementioned ingredients are used. For alcoholic solvents, water can be another ingredient.

The process-converting cosmetic products have at least two separate chambers.

Examples are in particular bicameral aerosol containers,

Two-chamber squeeze bottles or two-chamber containers with one

A double pump device, wherein one chamber contains the first part preparation and the second chamber contains the second part preparation.

A good method is also the spreading or rubbing by means of flat applicators, which are fed by a two-chamber container, in particular applicators with flocked and / or textile surface, since they have a low tendency to clog.

Furthermore, a method according to use in two-chamber roll-ons and

Two-chamber pump sprays possible and advantageous.

Pump sprays, like the aerosol sprays, provide a non-contact application to the skin. For pump sprays, however, pressure-resistant containers can be dispensed with.

Two-chamber pump sprays can be made metal-free, in particular aluminum-free. Advantageous containers are made of PE, PP or PET, which are closed with one or two metal-free spray pump (s), where metal-free means that the pumped preparation does not come into contact with metallic components. Depending on whether only one pump is used or two pumps are used, the supply takes place via one or two risers and the mixture of the first and second part preparation before or after the pump (s). Suitable propellants for preparations which can be sprayed from aerosol containers in the sense of the present invention are the customary known highly volatile, liquefied propellants, for example hydrocarbons (propane, butane, isobutane), which can be used alone or mixed with one another. Dimethyl ether, nitrous oxide, carbon dioxide, nitrogen and compressed air are also advantageous to use.

Of course, the person skilled in the art knows that there are per se nontoxic propellants which would in principle be suitable for the realization of the present invention in the form of aerosol preparations, but which should nevertheless be dispensed with because of a harmful effect on the environment or other concomitant circumstances, in particular fluorocarbons and Chlorofluorocarbons (CFCs).

For the purposes of the invention, it is also advantageous if the first and / or the second

Partial preparation according to the invention further cosmetic adjuvants, such as are commonly used in cosmetic preparations, e.g. Preservatives, preservatives, bactericides, perfumes, UV filters, antioxidants, water-soluble vitamins, minerals, suspended solid particles, foaming inhibitors, colorants, pigments having a coloring effect, thickeners, moisturizing and / or moisturizing substances or others usual ingredients of a cosmetic or dermatological formulation such as electrolytes, organic

Solvents, alcohols, polyols, emulsifiers, polymers, foam stabilizers or Sili konderivate.

Otherwise, the usual measures for the composition of cosmetic formulations are to be considered, which are familiar to the expert.

Comparative experiments and examples

The following examples are intended to illustrate the present invention without restricting it. All quantities, proportions and percentages are, unless stated otherwise, based on the weight and the total amount or on the total weight of the respective partial preparations.

For a comparative study, the partial preparations listed in Table 1 were prepared. In each case, a mixture of the 1st and 2nd part of Example 1 of the invention Example 1 malonic acid and the 1st and 2nd part of the preparation of the non-inventive Example Com. 1 containing lactic acid produced and examined in a study with regard to their sweat-reducing effect. The concentrations of malonic acid and lactic acid were adjusted so that when mixing the

Partial preparations of the same pH is achieved. The proportion of S1O2 in the 1.

Part preparations for Ex1 and Com.1 are each 6% by weight. Thus, the total amount of S1O2 in the total mixture is 3% by weight, based on the total weight of the mixture.

The study was conducted as follows:

There were 9 female participants in the study. There were three

Individual applications of the mixtures to be tested on three consecutive days. For this purpose, in each case mixtures of the partial preparations of Examples Bsp.1 and Com.1 were prepared and applied within 5 minutes after preparation to a limited, marked area of 4 cm × 5 cm on the backs of the participants. Each time 70mI_ of the respective mixture was applied. In addition, further test areas remained free as control (contralateral to each test site). 24 hours after the last application, the participants spent 15 minutes in a sauna at a temperature of 80 ° C. Pads on the respective test areas absorbed the sweat that was formed. The amount of sweat emitted from the test areas was determined gravimetrically.

Compared with the control area, preparation Bsp.1 showed a significant mean reduction in sweat of 39% in the participants. On the other hand, the showed

Comparative Preparation Com.1 only a medium number of participants

Sweat reduction of 12%. Thus, the example of the invention showed a significantly more efficient sweat-reducing effect than the example not according to the invention.

Further examples according to the invention:

Keltrol CG-F from CP Kelco Natrosol 250 from Ashland

Natrosol 250 from Ashland

Claims

claims

A kit comprising at least two cosmetic partial preparations, wherein a first

Partial preparation comprises at least one alkali metal silicate and a second part preparation at least malonic acid.

2. Kit according to claim 1, characterized in that the first and second part-preparation are stored separately in two different chambers and mixed for applying to the skin, wherein the time between mixing of the partial preparations and application of the mixture to the skin preferably not more than five minutes is.

3. Method for reducing or preventing perspiration thereby

characterized in that two cosmetic part preparations are mixed and the mixture is applied to the skin, wherein the time between mixing of the partial preparations and application of the mixture to the skin is not more than five minutes and wherein the first part preparation contains at least one alkali metal silicate and the second part preparation Contains malonic acid.

4. Kit or method according to one of the preceding claims, characterized in that the first part preparation contains sodium silicate and / or potassium silicate.

5. Kit or method according to one of the preceding claims, characterized in that the proportion of alkali metal silicates is chosen so that the proportion of Si0 ₂ from the general formula M2O _X S1O2 -y ^ O, where M is an alkali metal, x = 1 is and y = 0 to 9, in the mixture of the first and second part of preparation 0.5 wt .-% to 8 wt .-%, preferably 1 wt .-% to 6 wt .-% and particularly preferably, 2 wt .-% to 5 wt .-%, based on the total weight of the mixture of the first and second part of the preparation.

6. Kit or method according to one of the preceding claims, characterized in that the first part preparation has a pH of> 10, preferably of> 10.5, further preferably of> 11 and particularly preferably of> 11, 5.

7. Kit or method according to one of the preceding claims, characterized in that the second part preparation in addition to malonic acid contains more acids only in a proportion of up to 0.5 wt .-% based on the total weight of the second part preparation or no other acids.

8. Kit or method according to one of the preceding claims, characterized in that the second part preparation comprises a buffer system of bases and acids, wherein the acid is at least the malonic acid contained in the second part preparation.

9. Kit or method according to one of the preceding claims, characterized in that the second part preparation has a pH in the range of 1, 5 to 5, preferably 2 to 4 and particularly preferably 2.5 to 3.

10. Kit or method according to one of the preceding claims, characterized in that the second part preparation malonic acid in a proportion of 2.5 wt .-% to 12% by weight, preferably from 3.5 wt .-% to 9 wt. %, and more preferably from 5 wt .-% to 8 wt .-%, each based on the total weight of the second part preparation contains.

1 1. Kit or method according to one of the preceding claims, characterized in that the mixing ratio of the first part of the preparation for the second part preparation based on their weight proportions 10: 1 to 1: 10, preferably 5: 1 to 1: 5, further preferably 2: 1 to 1: 2, and particularly preferably 1, 2: 1 to 1: 1, 2.

12. Kit or method according to one of the preceding claims, characterized in that the proportions of the alkali metal silicates in the first part preparation and the proportions of the acids, in particular the malonic acid, and the optionally contained bases in the second part preparation are selected such that the mixture of the first and second part preparation has a pH of between 3.5 and 8, preferably between 4 and 5.7 and more preferably between 4.3 and 5.3.

13. Kit or method according to one of the preceding claims, characterized in that the mixture of the first part preparation and the second part preparation has a pH between 3.5 and 8, preferably between 4 and 5.7 and more preferably between 4.3 and 5.3.

14. Kit or method according to any one of the preceding claims, characterized in that one or both of the part preparations at least one stabilizer

group A: hexenol cis 3 (CAS 928-96-1), terpineol (CAS 8000-41-7), linalool (CAS 78-70-6), tetrahydrolinalool (CAS 78-69-3), triethyl citrate (CAS 77-93-0), 2-isobutyl-4-hydroxy-4-methyltetrahydropyran (CAS 63500-71-0), hexyl salicylate (CAS 6259-76-3), phenylethyl alcohol (CAS 60-12-8), 3-methyl-5-phenyl-1-pentanol (CAS 55066-48-3), 2,6-dimethyl-7-octene-2 ol (CAS 18479-58-8), benzyl salicylate (CAS 1 18-58-1), geraniol (CAS 106-24-1), citronellol (CAS 106-22-9) and ethyllinalool (CAS 10339-55-6 );

Group B: alcohols and diols; and or

Group C: Substances with at least three hydroxyl groups

contains.

15. Use of a kit according to any one of claims 1, 2 or 4 to 14 for

Reduction or prevention of perspiration.