EP1178775A1

EP1178775A1 - Antiperspirant stick

Info

Publication number: EP1178775A1
Application number: EP00929459A
Authority: EP
Inventors: Bernhard Banowski; Armin Wadle; Dieter Hengstermann
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 1999-05-07
Filing date: 2000-04-28
Publication date: 2002-02-13
Also published as: SK16032001A3; AU4753000A; CN1349400A; JP2002544153A; CA2373504A1; NO20015425L; NO20015425D0; WO2000067713A1; HUP0201339A2; PL351592A1; CZ20014011A3; DE19921192A1

Abstract

The invention relates to an antiperspirant stick with a content of (A) 10-30 wt. % astringent aluminium salts, zirconium salts or zinc salts, (B) 30-50 wt. % liquid carrier components, (C) 18-30 wt. % stabilising fat or wax components and (D) 1-20 wt. % water-soluble surfactants. The antiperspirant stick is provided with an improved antiperspirant effect when the liquid carrier component contains 20-40 wt. % nonpolar oil, e.g. a liquid silicone oil, and 10-30 wt. % polar oil selected from liquid, branched alkanols, alkandioles, ether alcohols and dialkyl ethers with 12-24 C-atoms and addition products of 2-30 mol propylene oxide to monovalent or multivalent alkanols with 3-20 C-atoms respectively in relation to the entire stick mass respectively.

Description

Antiperspirant pen

The present invention relates to an antiperspirant stick of the type of water-free or low-water dispersion sticks, the antiperspirant active ingredients of which are dispersed in a carrier consisting of a liquid, non-polar carrier material, setting fat or wax components and surfactants.

There are various cosmetic preparation forms on the market to inhibit sweating and to combat body odor, of which the stifit masses are particularly popular because of their simple and practical handling. The base material of such stick preparations must on the one hand have a certain hardness and dimensional stability, but on the other hand must be able to be rubbed onto the skin with slight pressure. These consistency properties can be e.g. by means of aqueous-alcoholic or aqueous-glycolic preparations solidified with soaps to form a gel. Such pens have the disadvantage that acidic aluminum salts, e.g. Aluminum chlorohydrate, cannot be assembled in such soap gel sticks.

Therefore, the so-called water-free dispersion sticks have become particularly important. These consist of a dispersion of finely divided astringent aluminum or zirconium salts in a non-polar carrier liquid solidified by gel formers or wax-like fat components. As non-polar carrier liquids e.g. Hydrocarbons or silicone oils, preferably those with boiling points below 200 ° C or with a certain volatility, e.g. cyclic siloxanes (cyclomethicones) and their mixtures with skin-softening oil components are used.

Such anhydrous dispersion sticks sometimes have the disadvantage that the antiperspirant effect of the astringent salts does not start quickly and intensely enough. The addition of surfactants has already made the stick mass more hydrophilic and also improved the washability of the residues from the skin or clothing. For example, US Pat. No. 4,151,272 describes antiperspirant sticks which contain up to 5% by weight of a fatty alcohol polyglycol ether. From EP 491 843 B1 antiperspirant stick compositions are known which contain an adduct of 10 moles of propylene oxide with butanediol to reduce the Weissel effect. From EP 777 463 B1 antiperspirant sticks are known which contain an 11,12-dihydroxystearic acid as a setting fat or wax component.

However, the known pen masses mentioned still have various disadvantages. For example, stick masses that have a too low content of setting wax components tend to separate oil in the heat. Stick masses whose liquid carrier component contains no polar components have an antiperspirant effect which is too weak. It has now been found that antiperspirant stick compositions, even with a relatively high content of setting fat or wax components, have a high effectiveness and a rapidly starting antiperspirant effect if the liquid carrier component has a higher proportion of polar oil components of the type of the liquid, branched alkanols, the alkane diols or the liquid dialkyl ether, each having 12-24 carbon atoms.

The invention therefore relates to antiperspirant stick compositions containing antiperspirant astringent salts which are dispersed in a composition which is stable at 40 ° C. and can be spread on the skin

(A) 10-30% by weight of an astringent aluminum, zirconium or zinc salt

(B) 30-50% by weight of a liquid carrier component

(C) 18-30% by weight setting fat or wax components with a melting point of

40 - 80 ° C

(D) 1-20% by weight of water-soluble surfactants

characterized in that the liquid carrier component (B) 20-40% by weight of a non-polar oil, preferably a low-boiling or liquid

Silicone oil 10-30% by weight of a polar oil, selected from liquid, branched alkanols,

Alkanediols, ether alcohols or dialkyl ethers, each with 12 - 24 C-

Atoms and addition products of 2 - 30 mol propylene oxide on mono- or polyvalent alkanols with 3 - 20 C atoms

contains. All percentages are based on the total mass of the pen.

Suitable antiperspirant active ingredients are, in particular, astringent or protein-coagulating aluminum, zirconium or zinc salts. Such suitable antiperspirant salts are, for example, aluminum chloride, aluminum hydroxychloride, aluminum dichlorohydrate, aluminum sesquichlorohydrate, their complex compounds with, for example, 1,2-propylene glycol, aluminum hydroxyallantoinate, aluminum chloride tartrate, aluminum sulfate, sodium aluminum lactate, potassium aluminum sulfate (K-alum ), Aluminum-zirconium trichlorohydrate, aluminum-zirconium-tetrachlorohydrate, aluminum-zirconium-pentachlorohydrate and their complex compounds with amino acids such as glycine, for example aluminum-zirconium-tetrachloro-glycine complex, sodium-zirconium-lactate, zinc sulfate and Zn - phenol sulfonate. The astringent salts should be finely divided, their average particle size should be less than 100 μm and preferably less than 50 μm. An aluminum hydroxychloride of the formula Al ₂ (OH) Cl * 2-3 H ₂ O is particularly preferably present in an amount of 15-25% by weight as the astringent salt.

It has proven to be particularly advantageous for rapid onset of action and high effectiveness if the astringent salts are coated or impregnated with a water-soluble, nonionic surfactant. Alkyl (oligo) glycosides which have been applied in amounts of 0.1 to 5% by weight to the surface of the salt particles have proven to be particularly suitable surfactants for this purpose.

Suitable as a setting fat or wax component are more or less all saturated, linear fatty acids and fatty alcohols with 14 - 22 C-atoms, triglycerides of saturated fatty acids with 14 - 22 C-atoms, saturated linear wax esters (fatty acid-fatty alcohol esters) with 28 - 44 carbon atoms or mixtures thereof. A mixture is particularly suitable from 1 part by weight of hydrogenated castor oil and 2 - 4 parts by weight of a cetyl or stearyl alcohol.

Suitable water-soluble surfactants are in principle all surfactants that are soluble in the system at 1% by weight at 20 ° C. and at least 1% by weight soluble in water at 20 ° C. Although the structure and ionogeneity per se are insignificant, nonionic surfactants, in particular the addition products of the ethylene oxide which are solid at normal temperature (20.degree. C.) to fat molecules with at least one alkoxylable group, seem to be particularly suitable. Such suitable surfactants are e.g. the adducts of 10-40 moles of ethylene oxide with linear fatty alcohols with 16-22 carbon atoms, with fatty acids with 12-22 carbon atoms, with fatty acid alkanolamides, with fatty acid monoglycerides, with sorbitan fatty acid monoesters, with fatty acid alkanolamides, with fatty acid glycerides, e.g. hardened castor oil, methyl glucoside monofatty acid esters and mixtures thereof.

The liquid carrier component consists of non-polar and polar liquid oil components. The main component is a non-polar oil, which can be, for example, a silicone oil or a hydrocarbon oil. A non-polar oil is preferably a low-boiling or volatile, linear or cyclic dimethylpolysiloxane. Particularly suitable volatile silicone oils are the cyclic polydimethylsiloxanes of the formula [(CH ₃ ) ₂ -SiO] _n , in which n = 4, 5 or 6. Such products are commercially available, for example, under the name Dow ^Corning® 200, 244, 245, 344 or 345.

The content of polar liquid carrier components has a particularly great influence on the application behavior, in particular on the spontaneous action of the antiperspirant stick composition. These are preferably liquid, branched alkanols, alkanediols, ether alcohols and dialkyl ethers each having 12-24 carbon atoms or addition products of 4-30 mol propylene oxide onto mono- or polyhydric alkanols with 3-20 carbon atoms. Addition products of ethylene oxide and propylene oxide onto these alkanols or polyols, such as e.g. Glycerin.

Suitable liquid branched alkanols are, for example, Guerbet alcohols with a single branch on carbon atom 2, for example 2-hexyl-decanol or 2-octyl-dodecanol. Further Suitable liquid alcohols are, for example, isotridecanol, isohexadecanol and mixtures of such alcohols.

Suitable alkanediols are the vicinal diols obtainable from epoxyalkanes with 12-24 C atoms by ring opening with water. Suitable ether alcohols are e.g. the monoalkyl ethers of glycerol, ethylene glycol, 1,2-propylene glycol or 1,2-butanediol and other products obtainable by ring opening from epoxyalkanes with monohydric alcohols, insofar as they have 12 to 24 carbon atoms.

Suitable dialkyl ethers are, for example, the alkyl methyl ethers or the di-n-alkyl ethers, each with a total of 12-24 carbon atoms. A particularly useful di-n-alkyl ether is the commercial product Cetiol OE ^® (Henkel KGaA), a di-n-octyl ether.

Suitable addition products of propylene oxide with monohydric or polyhydric alcohols are, for example, PPG-3 myristyl ether (Witconol ^® APM), PPG-14 butyl ether (Ucon Fluid ^® AP), or PPG-15 stearyl ether (Arla ol ^® E), PPG- 9-butyl ether (Breox ^® B25) or PPG-10-butanediol (Macol ^® 57).

In a preferred embodiment, the antiperspirant stick compositions according to the invention contain a branched alkanol as polar oil, selected from 2-hexyl-decanol, 2-octyl-dodecanol and mixtures of these alcohols with addition products of 2-20 moles of propylene oxide onto alkanols with 3-20 C- Atoms.

The stick compositions according to the invention can furthermore contain customary auxiliaries and cosmetic dermatological active ingredients.

Inert, finely divided, inorganic or organic fillers are of particular importance. Such inert fillers can be, for example, silicas, clays, talc, Veegum or organic fillers such as polymer powder, starch or cellulose powder. The antiperspirant stick compositions according to the invention preferably additionally contain 1 to 20% by weight of a finely divided filler selected from talc, silica and mixtures thereof. Such fillers significantly improve the strength, the oil-binding capacity and the abrasion behavior of the pen. Further auxiliaries customary in deodorant and antiperspirant compositions are perfume oil, antioxidants, complexing agents, antimicrobial substances, esterase-inhibiting deodorant active substances and odor-absorbing polymers. Finally, dyes and colored or white pigments can also be added to increase the attractiveness of the pencils.

The following examples are intended to explain the subject matter of the invention in more detail without restricting it thereto.

Examples

Stick masses of formulations 1-5 were produced using the raw materials specified in the table by customary processes. For comparison, the pen masses VI, V2, V3 and V4 were made

- a lower proportion of polar oils (VI, N3) and / or a lower proportion of setting fat or wax components (V2) or

- did not contain any water-soluble surfactants (N4).

The antiperspirant effect was determined using the Bio Skin method (SÖFW Journal, 123.

Volume 10/97, pages 639 - 642). The sweat reduction after 3 days of application was determined and compared to an untreated test zone. The

Results were assessed as follows:

Sweat reduction: ++ very good + good - weak

The hardness of the antiperspirant sticks was assessed after storage at 50 ° C. for 3 days.

Hardness (50 ° C) ++ very good + satisfactory - greasy, oil leakage

The following commercial products were used

Siliconör DC 245 Fluid: Dimethylcyclopentasiloxane

Eutanol ^® G16: 2-hexyl decanol

Cetiol ^® OE: di-n-octyl ether

Ucon Fluid ^® AP: PPG-14 butyl ether

Cutina ^® HR: hydrogenated castor oil

Lorol ^® C 18: stearyl alcohol

Lanette ^® O: CetylJ stearyl alcohol (1: 1)

Eumulgin ^® B 3: PEG-30-CetylJ stearyl ether

Cutina ^® E 24 PF: PEG-20 glyceryl stearate

AHC (aluminum chlorohydrate): Micro Dry ^® UF (Reheis / Interorgana)

Claims

claims

1. Containing antiperspirant stick composition containing antiperspirant active ingredients which are dispersed in a composition which is stable at 40 ° C. and can be spread on the skin

(A) 10-30% by weight of an astringent aluminum, zirconium or zinc salt,

(B) 30-50% by weight of liquid carrier components,

(C) 18-30% by weight of setting fat or wax components with a melting point of 40-90 ° C, (D) 1-20% by weight of water-soluble surfactants, characterized in that the liquid carrier component (B) 20- 40 wt .-% of a non-polar oil, preferably a low-boiling or volatile

Silicone oil, 10 - 30% by weight of a polar oil, selected from liquid, branched alkanols,

Alkanediols, ether alcohols and dialkyl ethers, each with 12 to 24 C-

Contains atoms and addition products of 2 - 30 mol propylene oxide on mono- or polyhydric alkanols with 3 - 20 C atoms, each based on the total stick mass.

2. antiperspirant stick composition according to claim 1, characterized in that a low-boiling or volatile, linear or cyclic dimethylpolysiloxane is contained as the non-polar oil.

3. antiperspirant stick composition according to claim 1 or 2, characterized in that the polar oil is a mono-branched alkanol selected from 2-hexyl-decanol, 2-octyl-dodecanol and mixtures of these alcohols with adducts of 2 to 20 moles of propylene oxide with alkanols with 3 - 20 carbon atoms.

4. antiperspirant stick composition according to any one of claims 1-3, characterized in that as a fixing fat or wax component saturated linear fatty acids or fatty alcohols with 14-22 C atoms, triglycerides saturated fatty acids with 16-22 C- Atoms, saturated linear wax esters with 28-44 carbon atoms or mixtures thereof are contained.

5. antiperspirant stick composition according to any one of claims 1-4, characterized in that as the astringent salt an aluminum hydroxychloride of the formula Al ₂ (OH) ₅ Cl »2-3 H ₂ O in an amount of 15 - 25 wt. % is included.

6. antiperspirant stick composition according to one of claims 1-5, characterized in that in addition a finely divided filler, selected from talc, silica and mixtures is contained in an amount of 1 - 20 wt .-%.