CA2373504A1

CA2373504A1 - Antiperspirant stick composition

Info

Publication number: CA2373504A1
Application number: CA002373504A
Authority: CA
Inventors: Bernhard Banowski; Armin Wadle; Dieter Hengstermann
Original assignee: Henkel AG and Co KGaA
Current assignee: Individual
Priority date: 1999-05-07
Filing date: 2000-04-28
Publication date: 2000-11-16
Also published as: EP1178775A1; DE19921192A1; CZ20014011A3; JP2002544153A; SK16032001A3; PL351592A1; NO20015425L; NO20015425D0; AU4753000A; HUP0201339A2; WO2000067713A1; CN1349400A

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

Article 34 Amendment Antiperspirant Stick This invention relates to an antiperspirant stick of the water-free or substantially water-free type in which the perspiration-inhibiting agents (perspiration inhibitors) are dispersed in a carrier consisting of a liquid nonpolar carrier material, solidifying fatty or wax components and surfactants.
There are various commercially available cosmetic preparations for inhibiting perspiration and for controlling body odor. Among these various preparations, sticks are particularly popular because they are simple and convenient to handle. The gel base of stick preparations is expected on the one hand to have a certain hardness and dimensional stability but, on the other hand, to be able to be rubbed onto the skin under light pressure.
These consistency properties can be achieved, for example, by aqueous/alcoholic or aqueouslglycolic preparations solidified with soaps to form a gel. Corresponding sticks have the disadvantage that acidic aluminium salts, for example aluminium chlorohydrate, cannot be made up into such soap gel sticks.
For this reason, so-called water-free dispersion sticks have acquired particular significance. Sticks of this type consist of a dispersion of fine-particle astringent aluminium or zirconium salts in a nonpolar carrier liquid solidified by gel formers or wax-like fatty components. Suitable nonpolar carrier liquids are, for example, hydrocarbons or silicone oils, preferably those with boiling points below 200°C or with a certain volatility, for example cyclic siloxanes (cyclomethicone) and mixtures thereof with skin-softening oil components.
Water-free dispersion sticks of the type in question occasionally have the disadvantage that the onset of the perspiration-inhibiting effect of the astringent salts is not sufficiently quick or intensive.

The stick composition has already been hydrophilicized by the addition of surfactants which also improves the removal of residues from the skin or articles of clothing by washing. For example, US 4,151,272 describes antiperspirant sticks which contain up to 5% by weight of a fatty alcohol polyglycol ether. EP 491 843 B1 discloses antiperspirant stick compositions which contain an addition product of 10 mol propylene oxide onto butanediol for reducing the "white patch" effect. EP 777 4fi3 B1 describes antiperspirant sticks which contain an 11,12-dihydroxystearic acid as the solidifying fatty or wax component.
Unfortunately, the known stick compositions mentioned above still have various disadvantages. Thus, stick compositions with too low a content of solidifying wax components tend to secrete oil in heat. Stick compositions whose liquid carrier component does not contain any polar components have too weak an antiperspirant effect. It has now been found that antiperspirant stick compositions, including those with a relatively high content of solidifying fatty or wax components, are extremely effective and rapidly develop their perspiration-inhibiting effect providing the liquid carrier component contains a relatively high percentage of polar oil components selected from liquid branched alkanols, alkane diols or liquid dialkyl ethers containing 12 to 24 carbon atoms.
Accordingly, the present invention relates to antiperspirant stick compositions which contain perspiration-inhibiting astringent salts dispersed in a paste dimensionally stable at 40°C but spreadable on the skin, said compositions containing (A) 10 to 30% by weight of an astringent aluminium, zirconium or zinc salt, (B) 30 to 50% by weight of a liquid carrier component, (C) 18 to 30% by weight of solidifying fatty or wax components with a melting point of 40 to 80°C, (D) 1 to 20% by weight of water-soluble surfactants, characterized in that the liquid carrier component (B) contains 20 to 40% by weight of a nonpolar oil, preferably a low-boiling or liquid silicone oil, to 30% by weight of a polar oil selected from liquid branched alkanols, 5 alkane diols, ether alcohols or dialkyl ethers containing 12 to 24 carbon atoms and addition products of 2 to 30 mol propylene oxide onto mono- or polyfunctional alkanols containing 3 to 20 carbon atoms, all the above percentages by weight being based on the stick composition as a whole.
10 Suitable perspiration inhibitors are, above all, astringent or protein-coagulating aluminium, zirconium or zinc salts. Suitable antihydrotic salts such as these are, for example, aluminium chloride, aluminium hydroxychloride, aluminium dichlorohydrate, aluminium sesquichloro-hydrate, complex compounds thereof with, for example, 1,2-propylene glycol, aluminium hydroxyallantoinate, aluminium chloride tartrate, aluminium sulfate, sodium aluminium lactate, potassium aluminium sulfate (K alum), aluminium zirconium trichlorohydrate, aluminium zirconium tetrachlorohydrate, aluminium zirconium pentachlorohydrate and complex compounds thereof with amino acids such as, for example, glycine, for example aluminium zirconium tetrachloroglycine complex, sodium zirconium lactate, zinc sulfate and Zn phenol sulfonate. The astringent salts should be finely particulate with a mean particle size below 100 pm and preferably below 50 pm. In a particularly preferred embodiment, the astringent salt is an aluminium hydroxychloride with the formula AI2(OH)5CI
~ 2-3 H20 present in a quantity of 15 to 25% by weight.
In the interests of a rapid onset of effect and high effectiveness, it has proved to be particularly advantageous for the astringent salts to be coated or impregnated with a water-soluble nonionic surfactant.
Surfactants which have proved to be particularly suitable for this purpose are alkyl (oligo)glycosides which are applied to the surface of the salt particles in quantities of 0.1 to 5% by weight.
Suitable solidifying fatty or wax components are more or less any saturated linear fatty acids and fatty alcohols containing 14 to 22 carbon atoms, triglycerides of saturated fatty acids containing 14 to 22 carbon atoms, saturated linear wax esters (fatty acidlfatty alcohol esters) containing 28 to 44 carbon atoms or mixtures thereof. A mixture of 1 part by weight of hydrogenated castor oil and 2 to 4 parts by weight of a cetyl or stearyl alcohol has proved to be most particularly suitable.
Suitable water-soluble surfactants are, basically, any surfactants which form a 1 % by weight solution in the system at 20°C and an at least 1 % by weight solution in water at 20°C. Although the structure and ionicity are basically irrelevant, nonionic surfactants, particularly the addition products - solid at normal temperature (20°C) - of ethylene oxide onto fatty molecules containing at least one alkoxylatable group, appear to be particularly suitable. Suitable surfactants of this type are, for example, the addition products of 10 to 40 mol ethylene oxide onto linear fatty alcohols containing 16 to 22 carbon atoms, onto fatty acids containing 12 to 22 carbon atoms, onto fatty acid alkanolamides, onto fatty acid monoglycerides, onto sorbitan fatty acid monoesters, onto fatty acid alkanolamides, onto fatty acid glycerides, for example onto hydrogenated castor oil, onto methyl glucoside monofatty acid esters and mixtures thereof.
The liquid carrier component consists of nonpolar and polar oil components. The principal component is a nonpolar oil, for example a silicone oil or a hydrocarbon oil. The nonpolar oil is preferably a low-boiling or volatile, linear or cyclic dimethyl polysiloxane. Particularly suitable volatile silicone oils are the cyclic polydimethyl siloxanes with the formula [(CH3)2-Si0]~ where n - 4, 5 or 6. Products such as these are commercially available, for example under the name of Dow Corning~ 200, 244, 245, 344 or 345.

A content of polar liquid carrier components has a particularly large bearing on the performance behavior and especially the spontaneous effect of the antiperspirant stick composition. Preferred polar liquid carrier components are liquid branched alkanols, alkanediols, ether alcohols and dialkyl ethers containing 12 to 24 carbon atoms or addition products of 4 to 30 mol propylene oxide onto mono- or polyfunctional alkanols containing 3 to 20 carbon atoms. Addition products of ethylene oxide and propylene oxide onto these alkanols or polyols, for example glycerol, may also be used in accordance with the invention.
Suitable liquid branched alkanols are, for example, Guerbet alcohols with a single branch at carbon atom 2, for example 2-hexyl decanol or 2-octyl dodecanol. Other suitable liquid alcohols are, for example, isotridecanol, isohexadecanol and mixtures of such alcohols.
Suitable alkanediols are the vicinal diols obtainable from C~2_24 epoxyalkanes by ring opening with water. Suitable ether alcohols are, for example, the monoalkyl ethers of glycerol, ethylene glycol, 1,2-propylene glycol or 1,2-butanediol and other products obtainable by ring opening of epoxyalkanes with monohydric alcohols providing they contain 12 to 24 carbon atoms.
Suitable dialkyl ethers are, for example, the alkyl methyl ethers or the di-n-alkyl ethers containing a total of 12 to 24 carbon atoms. A
particularly suitable di-n-alkyl ether is the commercial product Cetiol~ OE
(Henkel KGaA), a di-n-octyl ether.
Suitable addition products of propylene oxide onto mono- or polyhydric alcohols are, for example, PPG-3-myristyl ether (Vllitconol~
APM), PPG-14-butyl ether (Ucon Fluid~ AP) or PPG-15-stearyl ether (Arlamol~ E), PPG-9-butyl ether (Breox~ B 25) or PPG-10-butanediol (Macol~ 57).
In one preferred embodiment, the antiperspirant stick compositions contain as the polar oil a branched alkanol selected from 2-hexyldecanol, 2-octyldecanol and mixtures of these alcohols with addition products of 2 to 20 mol propylene oxide onto C3_2o alkanols.
The stick compositions according to the invention may additionally contain typical auxiliaries and active skin-care ingredients.
Inert, fine particle, inorganic or organic fillers are particularly important in this regard. Inert fillers such as these are, for example, silicas, clays, talcum, Veegum or organic fillers such as, for example, polymer powders, starch or cellulose powders. In a preferred embodiment, the antiperspirant stick compositions according to the invention additionally contain 1 to 20% by weight of a fine-particle filler selected from talcum, silica and mixtures thereof. Fillers such as these distinctly improve the strength, oil-binding capacity and rubbing behavior of the stick.
Other auxiliaries typically encountered in deodorant and antiperspirant compositions are perfume oil, antioxidants, complexing agents, antimicrobial agents, esterase-inhibiting deodorizers and odor-absorbing polymers. Finally, dyes and colored or white pigments may also be added to increase the attractiveness of the sticks.
The following Examples are intended to illustrate the invention without limiting it in any way.
Examples Stick compositions corresponding to formulations 1 to 5 were conventionally produced from the raw materials listed in the Table. Stick compositions C1, C2, C3 and C4 containing - a lower percentage of polar oils (C1, C3) andlor - a lower percentage of solidifying fatty or wax components (C2) or - no water-soluble surfactants (C4) were produced for comparison.
The antiperspirant effect was comparatively tested by the Bio Skin method (SOFW Journal, 123, Vol. 10197, pages 639-642). The reduction in perspiration after application for 3 days was determined and compared with an untreated test zone. The results were assessed as follows:
reduction in perspiration: ++ = very good, + = good, - = weak.
The hardness of the antiperspirant sticks was evaluated after storage for 3 days at 50°C:
hardness (50°C): ++ = very good, + = satisfactory, - = greasy, oil secretion Silikonol DC~ 245 28 28 23 23 23 38 42 47 31 Fluid Eutanol~ G 16 10 - - 15 10 - 10 - 10 Cetiol~ OE - 10 15 - - - - -Ucon Fluid~ AP 5 5 5 5 5 5 5 5 5 Cutina~ HR 6 6 6 6 6 6 2 5 6 Lorol~ C 18 20 20 20 - 20 20 - - 20 Lanette~ 0 - - - 20 - - 10 12 Eumulgin~ B3 3 3 3 3 3 3 3 3 Cutina~ E 24 PF - - - - 5 - - - -Talcum 8 8 8 8 8 8 8 8 8 Reduction in perspiration++ ++ ++ + ++ + + +

Hardness (50/72 ++ ++ ++ ++ ++ ++ - + ++
h) The following commercial products were used:
Silikonol~ DC 245 Fluid: dimethyl cyclopentasiloxane Eutanol~ G 16: 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: cetyllstearyl alcohol (1:1 ) Eumulgin~ B 3: PEG-30-CetyIIStearylether Cutina~ E 24 PF: PEG-20-Glycerylstearate AHC (aluminium chlorohydrate): Micro Dry~ OF (Reheisllnterorgana)

Claims

1. An antiperspirant stick composition which contains perspiration-inhibiting agents dispersed in a paste dimensionally stable at 40°C but spreadable on the skin, said composition containing (A) 10 to 30% by weight of an astringent aluminium, zirconium or zinc salt, (B) 30 to 50% by weight of liquid carrier components, (C) 18 to 30% by weight of solidifying fatty or wax components with a melting point of 40 to 90°C, (D) 1 to 20% by weight of water-soluble surfactants, characterized in that the liquid carrier component (B) contains - based on the stick composition as a whole -20 to 40% by weight of a nonpolar oil, preferably a low-boiling or liquid silicone oil, to 30% by weight of a polar oil selected from liquid branched alkanols, alkane diols, ether alcohols and dialkyl ethers containing 12 to 24 carbon atoms and addition products of 2 to 30 mol propylene oxide onto mono- or polyfunctional alkanols containing 3 to 20 carbon atoms.

2. An antiperspirant stick composition as claimed in claim 1, characterized in that a low-boiling or volatile, linear or cyclic dimethyl polysiloxane is present as the nonpolar oil.

3. An antiperspirant stick composition as claimed in claim 1 or 2, characterized in that a single-branch alkanol selected from 2-hexyl decanol, 2-octyl dodecanol and mixtures of these alcohols with addition products of 2 to 20 mol propylene oxide onto C3-20 alkanols is present as the polar oil.

4. An antiperspirant stick composition as claimed in any of claims 1 to 3, characterized in that saturated linear fatty acids or fatty alcohols containing 14 to 22 carbon atoms, triglycerides of saturated fatty acids containing 14 to 22 carbon atoms, saturated linear wax esters containing 28 to 44 carbon atoms or mixtures thereof are present as the solidifying fatty or wax component.

5. An antiperspirant stick composition as claimed in any of claims 1 to 4, characterized in that an aluminium hydroxychloride with the formula Al2(OH)5Cl - 2-3 H2O is present as the astringent salt in a quantity of 15 to 25% by weight.

6. An antiperspirant stick composition as claimed in any of claims 1 to 5, characterized in that a fine-particle filler selected from talcum, silica and mixtures thereof is additionally present in a quantity of 1 to 20% by weight.