EP2349494A2

EP2349494A2 - Antiperspirant stick

Info

Publication number: EP2349494A2
Application number: EP09736126A
Authority: EP
Inventors: Heike Miertsch; Anja Göppel; Stefan Biel
Original assignee: Beiersdorf AG
Current assignee: Beiersdorf AG
Priority date: 2008-10-22
Filing date: 2009-09-23
Publication date: 2011-08-03
Also published as: DE102008052747A1; WO2010046011A2; WO2010046011A3

Abstract

Disclosed is a water-free antiperspirant stick comprising one or more antiperspirant and/or deodorant substances, one or more low-melting waxes, and one or more high-melting waxes. Said stick contains less than 25 percent by weight of oils relative to the total weight of the stick and no volatile oils.

Description

Antiperspirant stick without volatile carrier oils

The invention includes anhydrous antiperspirant sticks without volatile carrier oils.

Typically, antiperspirants (AT) and deodorants (Deo) are offered in a variety of product forms, with scooters, pump sprayers and aerosols dominating in Europe, in the US, Central and South America pens. Both anhydrous (suspensions) and water-containing products (hydro-alcoholic formulations, emulsions) are known.

The pens are mainly divided into two types of formulation.

Deodorant sticks contain primarily soap, for example sodium stearate, oily bodies and bactericides. They have an alkaline pH of greater than 9. The consumer regards the soapy skin feeling associated with these pins as disadvantageous. Further developments relate to pens, the known antiperspirant active ingredients such. As aluminum chlorohydrate (ACH) included. These formulations are anhydrous and require special thickener systems, for. B. based on mixtures of stearyl alcohol and hydrogenated castor oil and based on natural or synthetic waxes.

Anhydrous solid or semi-solid formulations are characterized in that one or more solid particulate antiperspirant agents are suspended in a carrier. The carrier is usually at least one or more volatile oils, one or more non-volatile emollients and one or more thickeners.

Anhydrous solid and semi-solid products are characterized by a pudriges, non-sticky, velvety-silky skin feeling. A disadvantage is the tendency to form white residues. This is to be prevented by the selection and concentration of raw materials, especially the oils and thickeners.

The preparation of anhydrous preparations is possible in various ways, which are described below.

Antiperspirant formulations with high levels of clays (US 4526780, i US 5019375) or silicas (US 4937069, US 5069897, DE 69005029) with a content preferably greater than 2%. Disadvantage is the unwanted Weissein, the formation of white

Residues on the skin-use of silicone elastomers (crosslinked silicone polymers)

(WO 9800097, WO 9951192) or silicone latex copolymers (WO 9804236).

Use of thickener combinations based on triglycerides such as e.g. Tribehenin (US

5718890, WO 9717941, WO 0187251), also together with inorganic thickeners

(W09851272).

Use of hydrogenated castor oil in combination with paraffin (WO 9916410) and in

Combination with stearyl alcohol and dimethicone copolyol (US 5531986).

Antiperspirant gel formulations with hydroxystearic acid esters (US 5,552,136), wherein an additional gelling agent is required.

The prior art includes deodorant or antiperspirant formulations containing volatile carrier oils, especially cyclomethicones.

In US 2003053970 AT formulations are described with dialkyl carbonates, esterase inhibitors and deodorant / AT active ingredients, the oil content is more than 50%.

EP 804921 describes AT formulations with polyolefins as emollient for improving the skin feel of the formulations, the proportion of polyolefins being> 30%.

In WO 03092642 anhydrous formulations with u. a. Volatile carrier oils, emollient, natural wax and / or wax esters described that may be free of silicone oil, but necessarily contain other volatile oils.

WO 9843605 describes a combination of high-melting and low-melting wax, carrier oil, a non-Si-containing emollient and a surfactant. The carrier oils may be silicone or hydrocarbon oils but are necessarily volatile.

WO 2006097334 discloses anhydrous cosmetic compositions having a melting point of at least 30 ⁰ C containing at least one dicarboxylic acid diester of a C 6-18 dicarboxylic acid with C 12-22 fatty alcohols, at least one oil component and at least one inorganic astringent salt, a deodorant active or pigment. The oil component makes up at least 30% of the total formulation.

In DE 19921192 antiperspirant sticks are described which have antiperspirant active ingredients in a 40 ⁰ C dimensionally stable, spreadable on the skin mass. The Mass comprises water-soluble surfactants, firming fatty or wax components with a melting point of 40-90 ⁰ C and liquid carrier components based on a non-polar oil, in particular a low-boiling volatile silicone oil.

In DE 102007059678 anhydrous antiperspirant sticks containing at least one lipid or wax component having a melting point> 30 ⁰ C, at least one oil under normal conditions liquid oil selected from linear polydimethylsiloxanes having 2 to 50 siloxane units, not more than 5 wt .-% water, based on the total composition, and at least one antiperspirant active ingredient. The linear polydimethylsiloxane having 2 to 50 siloxane units is contained in a total amount of 10-60 wt.%, More preferably 20-50 wt.%, In the antiperspirant stick.

In the case of anhydrous antiperspirant sticks (AT-pen), low-melting and high-melting fats or waxes are used as structurants. Usually, longer-chain fatty alcohols (such as Lanette® 18) or ricinoleic acid derivatives (Castor Wax, Cutina® HR) are used as bodying agents for these stick compounds. Foundation compositions based on fatty substances having a defined melting point are known, for example, from EP 1161937. The use of long-chain, waxy C16-C60 dialkyl carbonates in anhydrous antiperspirant compositions is known from DE 101 62 049. In the field of anhydrous antiperspirant sticks and so-called "soft solid" formulations, fatty alcohols such as cetearyl, stearyl and behenyl alcohol and hydroxy fatty acids, for example 12-hydroxystearic acid, are frequently used as so-called wax base , 126,679 and EP 117070.

In DE 10361526 anhydrous and silicone oil-free deodorant and antiperspirant preparations are described. The preparations usually also comprise volatile hydrocarbons. A combination of low-melting and high-melting thickeners is not mentioned.

US 7452526 describes specific processes for the preparation of AT-pens. It also mostly uses volatile silicone oils or hydrocarbons. The thickeners mentioned for the preparation are primarily high-melting. Problem with the AT-pins is often that the fat-ΛΛ / achsomungen give the pen an insufficient consistency. In addition, white and tangible residues should be avoided.

Furthermore, in the development of AT-pins the problem of compatibility of the

To be aware of the fat / oil mixture with the used volatile and non-volatile oils.

Anhydrous stick preparations containing volatile silicone oils have the disadvantage that the dispersed active ingredients easily lead to visible product residues on skin and clothing. In addition, under pressure during application, oiling out (syneresis) often occurs, which reduces the cosmetic acceptance of these preparations by the user. Furthermore, the fatty alcohol base even with optimal selection of other emollients sensory leaves an unsatisfactory skin feeling and often leads to skin irritation.

Anhydrous pens of the prior art are characterized by a high proportion of oil, i. an oil content of more than 25 wt.% From. It contains oils from the group of volatile oils (cyclomethicones and hydrocarbons) and so-called masking oils. The volatile oils give the pens a slight sensory, but also tend to clear white residues.

It is desirable to provide an anhydrous AT-pen, which described the

Disadvantages of the prior art does not have. In particular, it would be desirable if an AT pen has a very homogeneous, smooth surface and does not tend to crumble.

It would also be advantageous to provide a pen that supports the formation of white

Reduces or prevents residues and at the same time causes a pleasant feeling on the skin.

The invention comprises an anhydrous antiperspirant stick comprising one or more antiperspirant and / or deodorant actives and one or more low melting point and one or more refractory waxes, wherein the preparation contains less than 25% by weight of oils and no readily volatile oils. The proportions refer in each case to the total mass of the pens.

The proportion of low-melting thickeners is in the range of 10 to 60 wt.%, Preferably in the range of 15 to 50 wt.%, Based on the total mass of the preparation. A residual amount of water may be present in the preparation according to the invention as a result of raw materials and may therefore be unavoidable.

For the purposes of the invention, therefore, the term "anhydrous" refers to compositions which contain less than 5% by weight of water (not including water of crystallization), preferably less than 2% by weight of water and in particular less than 1% by weight of water.

According to the invention, the antiperspirant formulations advantageously comprise at least:

1. one or more non-volatile emollients,

2. an antiperspirant active and

3. one or more texturizers (thickener and suspending aids).

Other components may include: surface-active substances (emulsifiers), fillers, deodorants, perfume and other cosmetic auxiliaries and additives.

According to the invention, emollients are to be understood oils, oils are water-insoluble, at 2O ⁰ C liquid, organic compounds with relatively low vapor pressure, the common feature is not the consistent chemical constitution, but the similar physical consistency. Oils are soluble in almost all organic solvents, with the solubility not always equal to that of the fatty acid components. They differ from the fats, which also consist of triglycerides, by their lower melting point, which increases with the chain length and decreasing number of double bonds.

Emollients serve according to the invention as a carrier oil to disperse the solids contained and as a masking oil to minimize white residues. At the same time they contribute significantly to the skin feeling. Emollients, which contribute to the minimization of residues, are characterized by a relatively high refractive index (> 1.40).

The emollients are preferably from the group of branched and unbranched hydrocarbons, silicone oils, dialkyl ethers, dialkyl, the group of saturated or unsaturated, branched alcohols, and the fatty acid triglycerides, namely the synthetic or natural triglycerol esters of saturated and / or unsaturated, branched and or unbranched alkanecarboxylic acids having a chain length of 8 to 24, the group of esters of saturated and / or unsaturated, branched and / or unbranched alkanemono- or dicarboxylic acids having a chain length of 1 to 44 carbon atoms and saturated and / or unsaturated, branched and / or or unbranched alcohols or Diols of a chain length of 1 to 44 carbon atoms, from the group of esters or diesters of aromatic and / or non-aromatic carboxylic acids and saturated and / or unsaturated, branched and / or unbranched alcohols (monovalent or polyvalent) of a chain length of 1 to 30 C atoms, provided that the oil component or the entirety of the oil components at room temperature is a liquid.

According to the invention, the proportion of oils, including emollients, in the anhydrous pencil is limited to less than 25% by weight, based on the total mass of the pencil. Advantageously, the oil content is even less than 22 wt.%, Based on the total weight of the preparations. Volatile oils are completely dispensed with according to the invention.

Volatile oils are oils which have a substantial vapor pressure at body temperature. According to the prior art, these may be silicone oils, in particular cyclomethicones, and hydrocarbons, in particular isoparaffins

According to DE 102007059678, in which the presence of volatile silicone oils, in particular cyclomethicone are excluded, the stick preparation according to the invention does not comprise a linear polydimethylsiloxane having 2 to 50 siloxane units.

Advantageous acidic aluminum and / or aluminum / zirconium salts can be incorporated as antiperspirant active. In this case, the concentration ranges described relate to the so-called active contents of the antiperspirant complexes: in the case of the aluminum compounds, to anhydrous complexes, in the case of the aluminum / zirconium compounds to water-free and buffer-free complexes. The buffer used here is usually glycine.

The following list of advantageous antiperspirant active agents should not be restrictive in any way:

Aluminum salts:

• Aluminum salts such as aluminum chloride AICI ₃ , aluminum sulfate AI ₂ (SO ₄ J ₃

• Aluminum chlorides of the empirical empirical formula [Al ₂ (OH) _m Cl _n ], where m + n = 6

Aluminum chlorohydrate [Al ₂ (OH) ₅ Cl] x H ₂ O o Standard AI complexes: Locron P (Clariant), Micro-Dry (Reheis), ACH-331

(Summit), Aloxicoll PF 40 (Giulini). o Activated Al complexes: Reach 501 (Reheis), AACH-324 (Summit), AACH

7171 (Summit), Aloxicoll P (Giulini), Aloxicoll SD100

• Aluminum sesquichlorohydrate [Al ₂ (OH) _{4 5} Cl _{1 5} ] x H ₂ O o Standard AI Complexes: Aluminum sesquichlorohydrate (Reheis), AACH-308

(Summit) o Activated AI Complexes: Reach 301 (Reheis)

• Aluminum dichlorohydrate [Al ₂ (OH) ₄ Cl ₂ ] x H ₂ O

Aluminum-zirconium salts:

• aluminum / zirconium trichlorohydrex glycine [AWZr (OH) 13 Cl3] x H2O x Gly o standard Al / Zr complexes: Rezal 33GP (Reheis), AZG-7164 (Summit),

Zirconal P3G (Giulini) o Activated Al / Zr Complexes: Reach AZZ 902 (Reheis), AAZG-7160 (Summit),

Zirconal AP3G (Giulini)

• Aluminum / Zirconium Tetrachlorohydrex Glycine [AWZr (OH) 12 Cl4] x H2O x Gly • Standard Al / Zr Complexes: Rezal 36G (Reheis), AZG-368 (Summit), Zirconal

L435G (Giulini) o Activated Al / Zr Complexes: Reach 908 (Reheis), AAZG-7167 (Summit),

Zirconal AP4G (Giulini)

• aluminum / zirconium pentachlorohydrex glycine [Al8Zr (OH) 23Cl5] x H2O x Gly

• Aluminum / Zirconium Octachlorhydrex Glycine [Al8 Zr (OH) 20 Cl8] x H2O x Gly

However, it is also advantageous to use glycine-free aluminum / zirconium salts. Also advantageous may be the use of AT salt suspensions or gels in which aluminum salts present in powder form are dispersed in various oils.

The antiperspirant active ingredients are used in the formulations according to the invention in an amount of from 1 to 35% by weight, preferably from 5 to 25% by weight.

In the preparation of the invention may be included in the structure. The structurants can on the one hand increase the viscosity of a formulation and on the other serve to stabilize certain raw materials, such as particles, in the formulation.

It is differentiated between thickener and suspending aids.

Essential components of the pen according to the invention are

a. low-melting thickener and b. high-melting thickener Thickeners are understood to mean those substances which melt at a temperature above room temperature (20 ^° C.) and crystallize on solidification in such a way that the viscosity of the formulation is increased and a semisolid to solid product can be formed. In particular, fats and waxes are preferred thickeners. They are preferably insoluble in water or immiscible with water in the molten state.

According to the invention, the difference between the oils, the proportion of which is not more than 25%, to the oil-based thickeners, the one that the former have a melting point to 20 ⁰ C and the latter above 20 ° (at atmospheric pressure).

Fats are at, from 20 ⁰ C solid or semi-solid substances of the plant or animal body, which consist essentially of mixed triglycerides of higher fatty acids with even number of carbon atoms and small proportions of acyl lipids (eg sterol esters) and the Unsaponifiable. Many impurities, such as mineral oils, plasticizers and biocides, which accumulate in the fat due to their lipophilic character, are also unsaponifiably present.

The fats are often among the low-melting thickeners. Low-melting thickeners according to the invention are those whose melting temperature in the range between 20 ⁰ C and 50 ⁰ C, below 50 ⁰ C. For antiperspirant formulations are preferred as low-melting thickeners which melt in the range between 30 ⁰ C and 45 ° C. They are preferably selected from the group of triglycerides and / or esters.

High-melting thickeners, in particular waxes, are to be understood as meaning components which melt above 50 ^° C. Waxes usually have the following properties: at 20 ⁰ C kneadable, solid to brittle hard, coarse to finely crystalline, transparent to opaque, but not glassy; melting above 40 ° C. without decomposition, already a little above the melting point, relatively low-viscous and non-stringy, strongly temperature-dependent consistency and solubility, polishable under slight pressure. They differ from similar synthetic or natural products (eg resins, plastic masses, metal soaps, etc.) mainly in that they turn into the molten, low-viscosity state at between about 50 and 90 ^° C. Waxes may be of natural origin, chemically modified or of synthetic origin. In the case of natural waxes, a distinction is made between vegetable (eg carnauba wax, candelilla wax), animal (eg beeswax) and mineral origin (eg microwaxes, ceresin, ozokerites). According to the invention is at least one low and at least one refractory

Thickener, advantageously a wax in the preparation, available.

Wax esters, such as cetyl palmitate, or hydrogenated vegetable oil, such as Lipex BC, should be selected, for example, as low-melting waxes.

As high-melting waxes are preferably selected waxes such as Kahlwachse, the Fa

Kahl, microcrystalline waxes, such as Ceresine IscoCare 116, Microcare 114, Paracera S the

Fa. Paramelt or synthetic waxes, such as Sasolwax C80, the Fa Sasol.

The proportion of low-melting waxes is in the range of 10 to 60 wt.%, Preferably in the range of 15 to 50 wt.%, Based on the total mass of

Preparation.

This limited proportion of low-melting thickeners, advantageously waxes, in particular microcrystalline waxes, such as Ceresine IscoCare 116, Microcare 1 14, Paracera

S or synthetic waxes, such as Sasolwax C80, leads to the advantages according to the invention of a homogeneous, smooth surface of the pens and the avoidance or reduction of whiteness

Residues.

The proportion of high-melting thickeners, in particular waxes, is advantageously in the range of 0.5 to 20 wt.%, Preferably 1 to 15 wt.%, Based on the total mass of the stick preparation.

According to the invention waxes of mineral origin, microcrystalline waxes, as well as other waxes may additionally be included in addition.

In addition, further fatty alcohols may be included. Surprisingly, a low level of fatty alcohols results in a firmer stick structure without causing white residue. The proportion of fatty alcohols is advantageously not more than 15% by weight, in particular the proportion is in the range from 3 to 10% by weight, based on the total mass of the stick.

The ratio of microwax, as high-melting waxes, to fatty alcohol is then advantageously from 15: 1 to 1: 5, in particular from 10: 1 to 1: 2.

In addition, in addition to the low or high melting thickeners also suspending aids may be included. Suspension aids increase the stability of particles in suspensions. In anhydrous antiperspirant formulations, modified phyllosilicates, clay minerals and / or silicas are preferably used as suspending aids. According to the invention, these may also be advantageously added to the AT-pen. Advantageous modified sheet silicates in the sense of the present invention are, for example, modified smectites. Smectites are very fine grained (mostly grain size <2 mm), predominantly lamellar, mossy or spherical aggregates occurring three-layer clay minerals in which a central layer of octahedrally coordinated cations sandwiched by two layers of [(Si, Al) O4] tetrahedra is. Advantageous modified smectites are z. B. modified montmorillonites. Montmorillonites are described by the approximate chemical formula AI 2 [(OH) 2 / Si 4 O 10] • n H 2 O or Al 2 O 3 • 4SiO 2 • H 2 O • n H 2 O and represent the clay minerals belonging to the dioctahedral smectites. Particularly advantageous for the purposes of the present invention also, for example, modified hectorites. Hectorites belong to the smectites and have the approximate chemical formula M + 0.3 (Mg2.7e0.3) [Si4O10 (OH) 2], where M + is usually Na +.

Also advantageous for the purposes of the present invention are modified bentonites. Bentonites are clays and rocks that contain smectites, especially montmorillonite, as main minerals. The "bent" bentonites are either calcium bentonites (referred to in the UK as fuller earths) or sodium bentonites (also: Wyoming bentonites).

Modified phyllosilicates in the context of the present invention are phyllosilicates, in particular the abovementioned phyllosilicate types whose organophilicity (also: lipophilicity) - eg. B. by reaction with quaternary ammonium compounds - was increased. Such phyllosilicates are also referred to as organophilic phyllosilicates.

Particularly preferred according to the invention are stearalkonium hectorite, a reaction product of hectorite and stearalkonium chloride (benzyldimethylstearylammonium chloride), and quaternium-18 hectorite, a reaction product of hectorite and quaternium-18. Likewise preferred according to the invention is Quatemium-90 bentonite, a reaction product of bentonite and quaternium-90.

When clay minerals are used, a so-called activator may additionally be used, which is also advantageous according to the invention. This has the task to delaminate the clay mineral used, which is also called activation. Typically, this small, polar molecules such as propylene glycol carbonate and ethanol are used, which move under mechanical energy input between the layers of Tonminerallamellen and thus enable the desired process by electrostatic interaction with these. In addition, they form and provide hydrogen bonds to the delaminated clay mineral platelets through this bridging function for the cohesion of the resulting playing-house-like structure. Typically, these systems show a pronounced thixotropy.

Silicas are compounds of the general formula (SiO 2) m • n H 2 O. According to the invention, the fumed silicas are of great importance. The term pyrogenic silicas combines highly disperse silicas which are produced by flame hydrolysis (type A). They have significantly less OH groups than precipitated silicas on their virtually pore-free surface. Because of their caused by the silanol groups hydrophilicity, the synthetic silicas are often subjected to a chemical aftertreatment process in which the OH groups z. B. react with organic chlorosilanes. This creates modified, z. As hydrophobic surfaces that significantly expand the performance properties of silicas. They are available under the tradenames Aerosil and Cab-O-Sil with different properties.

The total amount of one or more suspending aids in the formulations according to the invention is advantageously in the range from 0.05 to 5.0% by weight, preferably from 0.1 to 3.0% by weight, based on the total mass of the pens.

In addition to the fatty alcohols in particular, other ingredients may be more common

Cosmetics may be included in the pen of the invention.

In addition, and according to the invention, the AT pins comprise emulsifiers.

Emulsifiers are auxiliaries for the preparation and stabilization of emulsions, which can also be referred to as surface-active substances or surfactants and are generally present as oily to waxy but also pulverulent substances. Emulsifiers reduce the interfacial tension between the two phases and, in addition to reducing interfacial work, also stabilize the emulsion formed. They stabilize the emulsion formed by interfacial films as well as by forming steric or electrical barriers, thereby preventing the coalescence of the emulsified particles.

For compounds to be effective as emulsifiers, they must have a particular molecular structure. The structural feature of such compounds is their amphiphilic molecular structure. The molecule of such a compound has at least one Group with affinity for substances of strong polarity (polar group) and at least one group with affinity for nonpolar substances (apolar group).

In anhydrous suspensions, the emulsifiers are used to improve the washability of the formulation from the skin. The structural modifiers advantageously contained in the anhydrous formula can leave noticeably waxy residues on the skin. The presence of polar groups on the emulsifiers used increases the affinity for the water when washing off the formulation and the residues disappear. Nonionic emulsifiers are preferred for this purpose.

Nonionic emulsifiers are understood as surface-active substances which do not form any ions in aqueous solution. The hydrophilicity of such nonionic emulsifiers is achieved by the proportion of polar groups in the molecule. The nonionic emulsifiers include fatty alcohols (eg cetyl or stearyl alcohol), partial fatty acid esters of polyhydric alcohols with saturated fatty acids (eg glycerol monostearate), partial fatty acid esters of polyhydric alcohols with unsaturated fatty acids (eg glycerol monooleate, pentaerythritol monooleate), furthermore Polyoxyethylene esters of fatty acids (for example polyoxyethylene stearate), polymerization products of ethylene oxide and propylene oxide with fatty alcohols (fatty alcohol polyglycol ethers) or fatty acids (fatty acid ethoxylates).

The emulsifiers are used in the formulations according to the invention in an amount of from 0.1 to 10% by weight, preferably from 0.2% by weight to 5% by weight.

Furthermore, the pins according to the invention may preferably also contain fillers.

Fillers are to be understood as meaning particulate raw materials which are inert to the remaining formulation constituents. They contribute essentially to the feel of the skin, but can also influence the appearance and structure of the formulation. Simple, neutral fillers are preferably talc and kaolin, but also polysaccharides such as starches and celluloses and their derivatives are suitable as fillers.

The fillers are used in the formulations according to the invention in an amount of from 0.5 to 25% by weight, preferably from 1 to 20% by weight.

Antiperspirant preparations often include acidic aluminum salts as antiperspirant active substances. Aluminum salts as AT activities sometimes lead to a typical acidic odor in formulations. Although this can be covered by perfumes, occurs in the course of storage, however, temporarily stronger again. Furthermore, aluminum salts can lead to a yellowing of the product, especially in Pasty and solid products is undesirable. The cause of these odor and color changes could be a reaction of the aluminum salts with constituents of the formulation.

These disadvantages can be reduced or avoided according to the invention by the addition of hydrotalcite in combination with the small amounts of water. Hydrotalcite is an international nonproprietary name for the effective as an antacid Dialuminum- hexamagnesium carbonate hexadecahydroxid tetrahydrate, Al ₂ O ₃ ^• 6MgO ^• CO ₂ ^• 12H ₂ O or Al ₂ Mg ₆ (OH) ₁₆ CO ₃ ^• 4H ₂ O, M, 531, 92. Hydrotalcite is practically insoluble in water. However, in order for the hydrotalcite to function as an acid scavenger in the low-water formulation, the addition of water is necessary. Hydrotalcite was patented by Kyowa in 1970 and is available from Bayer (Talcid ^® ) and as a generic medicine. Hydrotalcite neutralizes excess stomach acid, which has harmful effects on the gastric mucous membranes. This relieves eg heartburn and gastrointestinal ulcers heal faster.

Hydrotalcite is understood according to the invention to mean water-containing carbonates having foreign anions. Particularly suitable in this sense is an aluminum hydroxide magnesium carbonate, which is offered under the trade name Alma 3512 by SPI Pharma.

Furthermore, hydrotalcite is understood to mean a synthetically produced aluminum-magnesium hydroxycarbonate, which is offered for example by SüdChemie and used as a costabilizer in the production of PVC and polyolefins.

The term hydrotalcite according to the invention comprises the compounds having the names aluminum hydroxide magnesium carbonate and dialuminum hexamagnesium carbonate hexadecahydroxide tetrahydrate.

Hydrotalcite is reduced by the free chloride released from the antiperspirant (AT) agents. The AT formulations no longer turn yellow and the unpleasant odors are avoided. This results in better perfume release, better perfume stability and white products. Although hydrotalcite makes the product whiter, the white residue is not enhanced.

Hydrotalcite thus serves to avoid odor and color changes in antiperspirant preparation comprising one or more antiperspirant and / or Deodorant agents and a maximum of 5 wt.% Water, based on the total mass of the preparation.

The addition of water is at most 5% by weight and thus defines the above-mentioned upper limit of the "low water" of the AT-pins according to the invention.

A combination of hydrotalcite and water in the ratio of 10: 1 to 1:10 is advantageous.

The advantage of the formulation according to the invention is the very homogeneous, smooth surface of the pins. The pins have a smooth break and have very little white residue. In addition, they are characterized by a very pleasant feeling on the skin, as the relatively high proportion of low-melting waxes melts directly on the skin. Nevertheless, the pins have a sufficiently high thermal stability. This is achieved in that the carrier material consists of emollients in a small amount (<25 wt.%) And also contains no volatile oils. The suspension of the powders takes place in the emollients and the low-melting structurants advantageously contained.

The following examples are intended to illustrate the present invention without limiting it. Unless indicated otherwise, all amounts, proportions and percentages are based on the weight and the total amount or on the total weight of the preparations. The percentages by weight given in the examples are active contents.

: high-melting waxes of the company Kahl: high-melting wax of the company Sasol: low-melting waxes: oils with a melting point <20 ^° C.

Claims

claims

Anhydrous antiperspirant stick comprising one or more antiperspirant and / or deodorant actives, one or more low melting and one or more high melting thickeners, characterized in that less than 25 wt.% Oils, based on the total mass of the stick, and no readily volatile oils are contained and the proportion of low-melting thickeners in the range of 10 to 60 wt.%, Preferably in the range of 15 to 50 wt.%, Based on the total mass of the preparation.

2. pen according to claim 1, characterized in that are selected as thickeners waxes.

3. pen according to claim 1, characterized in that as an antiperspirant active acidic aluminum and / or aluminum / zirconium salts are included.

4. Pen according to one of the preceding claims, characterized in that in addition one or more fatty alcohols are contained.

5. Pen according to one of the preceding claims, characterized in that in addition dialuminum hexamagnesium carbonate hexadecahydroxide tetrahydrate (hydrotalcite) and up to 5 wt.% Water, based on the total mass of the stick preparation, are included.

6. Pen according to one of the preceding claims, characterized in that no linear polydimethylsiloxane is contained with 2 to 50 siloxane units in the pen.