SK16032001A3 - Antiperspirant stick - Google Patents

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

The present invention relates to a solid antiperspirant of the anhydrous or low water dispersion bar type, wherein the sweat-reducing active ingredients are dispersed in a carrier consisting of a liquid, non-polar carrier material, strengthening fatty or waxy ingredients and surfactants.

BACKGROUND OF THE INVENTION

Various forms of cosmetics have been marketed to inhibit sweat secretion and to prevent body odor, of which solids are particularly popular for ease of use and practical use. The matrix of such solid preparations must, on the one hand, have a certain hardness and resistance to shape, but on the other hand, it must be able to spread well under the light pressure on the skin. These consistency properties can be achieved, for example, with gel-hardened water-alcohol or water-glycol preparations. Such solid formulations have the disadvantage that acidic aluminum salts, such as aluminum chlorohydrate, cannot be finally treated in such soap-gel bars.

Therefore, the so-called anhydrous dispersion solid preparations have become of particular importance. These compositions consist of a dispersion of fine particulate aluminum or zirconium astringent salts in a non-polar carrier liquid reinforced with gel-forming or wax-like fatty components. As non-polar carrier fluids, for example, hydrocarbons or silicone oils may be used, preferably those having boiling points below 200 ° C or some volatility, for example cyclic siloxanes (cyclomethicone) and mixtures thereof with skin-softening oil components.

Such anhydrous dispersion solid preparations occasionally have the disadvantage that the inhibitory effect of astringent salts on sweat formation does not act quickly and intensely enough. Although hydrophilicization of the solid mass has been achieved by the addition of surfactants, the washability of the skin or clothing remains has also been improved. For example, US-4,151,272 discloses solid antiperspirants containing up to 5% by weight of a polyglycol ether of a fatty alcohol. EP 491 843 B1 discloses solid antiperspirant compositions which contain an addition product of 10 moles of propylene oxide and butanediol to reduce the Weissel effect. EP 777 463 B1 discloses solid antiperspirants which contain 11,12-dihydroxystearic acid as a strengthening fatty or waxy component.

However, the known solids still have various disadvantages. For example, solids having a low content of reinforcing wax components tend to heat up in the heat. Solids whose liquid carrier components contain no polar components have too weak an antiperspirant effect. It has now been found that solid antiperspirant solids with a relatively high content of firming fatty or waxy ingredients also exhibit high potency and a rapid sweat inhibitory effect when the liquid carrier component contains a higher proportion of polar oil components such as liquid, branched alkanols, alkanedioids or liquid dialkyl ethers, in each case having from 12 to 24 carbon atoms.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION The present invention provides solid antiperspirants with perspiration-inhibiting astringent salts dispersed in a composition having a stable shape at 40 ° C and spreadable to the skin, comprising:

(A) 10 to 30% by weight of an aluminum, zirconium or zinc astringent salt, (B) 30 to 50% by weight of a liquid carrier component, (C) 18 to 30% by weight of reinforcing fatty or waxy components with a melting point of 40 to 80 ° C, (D) 1 to 20% by weight of water-soluble surfactants, wherein the liquid carrier component (B) comprises:

up to 40% by weight of a nonpolar oil, preferably a low boiling silicone oil or a volatile silicone oil,

-310 to 30% by weight of a polar oil selected from liquid branched alkanols, alkanediols, ether alcohols or dialkyl ethers having from 12 to 24 carbon atoms and addition products of from 2 to 30 moles of propylene oxide with mono- or polyhydric alkanols of 3 to 20 carbon atoms. All percentages are based on the entire antiperspirant mass.

Especially preferred are the astringent or protein coagulant salts of aluminum, zirconium or zinc. Preferred such antihydroticky active salts include aluminum chloride, alumíniumhydroxychlorid, sulfocarbolate, alumíniumseskvichlórhydrát, which the compounds, for example, 1,2-propylene glycol, alumíniumhydroxyalantoinátom, alumíniumchloridvínanom, Aluminiumsulfat, nátriumalumíniumlaktátom, káliumalumíniumsulfátom (K-alum), alumíniumzirkóniumtrichlórhydrátom, alumíniumzirkóniumtetrachlórhydrátom, and alumíniumzirkóniumpentachlórhydrátom which the compounds with amino acids such as glycine are, for example, aluminum zirconium tetrachloroglycine complex, sodium zirconium lactate, zinc sulfate and Zn-phenolsulfonate. The astringent salts should be fine-particle, their mean particle size should be less than 100 µm and preferably less than 50 µm. Particular preference is given to using an aluminum salt of aluminum hydroxide of the formula Α 2 (ΟΗ) δΟΙ · 2-3 H ₂ O in an amount of 15 to 25% by weight.

It has been found to be particularly advantageous for the rapid onset of action and high efficacy when the astringent salts are coated or impregnated with a water-soluble, nonionic surfactant. Particularly preferred surfactants for this purpose have been shown to be alkyl (oligo) -glycosides which have been applied in an amount of 0.1 to 5% by weight on the surface of the salt particles.

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

As water-soluble surfactants, preferably all surfactants which dissolve in the system at 20 ° C to 1% by weight and which dissolve in water at 20 ° C to at least 1% by weight are preferred. Although the structure and ionogenicity are negligible in themselves, nonionic surfactants appear to be particularly advantageous, which are solid addition products of ethylene oxide with a fatty acid molecule having at least one alkoxylated group, especially at normal temperature (20 ° C). Such preferred surfactants are, for example, the addition products of 10 to 40 moles of linear fatty alcohols having from 16 to 22 carbon atoms, fatty acids of 12 to 22 carbon atoms, fatty acid alkanolamides, fatty acid monoglycerides, sorbitan and fatty acid monoesters, fatty acid alkanolamides, fatty acid glycerides, for example, hardened castor oil, methyl glucoside monomeric fatty acid esters, and mixtures thereof.

The liquid carrier component consists of nonpolar and polar liquid oil components. The main component is a non-polar oil, which may be, for example, silicone oil or hydrocarbon oil. Preferably, low-boiling dimethylpolysiloxane or volatile dimethylpolysiloxane, linear or cyclic dimethylpolysiloxane is used as the nonpolar oil. Particularly preferred volatile silicone oils are cyclic polydimethylsiloxanes of the formula [(CH ₃ ) 2-SiO] _n where n = 4, 5 or 6. Such products are commercially available 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 behavior with respect to the technique of use, in particular on the spontaneous effect of the solid antiperspirant. These components are preferably liquid, branched alkanols, alkanediols, ether alcohols and dialkyl ethers having in each case 12 to 24 carbon atoms or addition products of 2 to 30 moles of propylene oxide having mono- or polyhydric alkanols having 3 to 20 carbon atoms. It is also possible according to the invention to use ethylene oxide and propylene oxide addition products with these alkanols or polyols, such as glycerin.

Suitable liquid branched alkanols are, for example, single-branched guerbet alcohols on carbon 2, for example 2-hexyldecanol or 2-octyldodecanol. Other preferred liquid alcohols are, for example, isotridecanol, isohexadecanol and mixtures of these alcohols.

Preferred alkanediols are vicinal diols obtained from C 12 -C 24 epoxyalkanes by ring-opening with water. Preferred ether alcohols are, for example, monoalkyl ether of glycerine, ethylene glycol, 1,2-propylene glycol or 1,2-butanediol, as well as other products obtained by ring-opening of epoxyalkanes with monohydric alcohols, provided they have 12 to 24 carbon atoms.

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

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

In a preferred embodiment, the solid antiperspirants according to the invention comprise as a polar oil a branched alkanol selected from 2-hexyldecanol, 2-octyldodecanol and mixtures of these alcohols with addition products of 2 to 20 moles of propylene oxide having 3 to 20 carbon atoms.

Furthermore, the solid compositions according to the invention may contain conventional adjuvants and cosmetic-dermatological active substances.

Of particular importance here are inert, fine-particle, inorganic or organic fillers. Such inert fillers may be, for example, silicas, clays, talc, veegum or organic fillers, such as a polymer powder, starch or cellulose powder. The solid antiperspirants according to the invention preferably contain additionally 1 to 20% by weight of a fine particulate filler selected from talc, silicic acid and mixtures thereof. These fillers greatly improve the strength, oil-binding and mass-abrasion properties.

Other common adjuvants in deodorants and antiperspirant preparations are perfume oil, antioxidants, complexing agents, antimicrobials, esterase-inhibiting deodorants and odor absorbing polymers. Finally, dyes and colored or white pigments may also be added to increase the attractiveness of the antiperspirant compositions.

The following examples are intended to illustrate the invention without limiting it.

-6Examples of embodiments of the invention

Solids with recipes 1 to 5 were produced with the raw materials listed in the table by conventional methods. For comparison, the solids V1, V2, V3 and V4 were produced, containing:

a small proportion of polar oils (V1, V3) and / or

a minor proportion of strengthening fatty or waxy ingredients (V2), or

- contain no water-soluble surfactants (V4).

The antiperspirant effect was investigated by comparison with the Bio Skin method (SF Journal, 123, Volume 10/97, pages 639-642). The reduction in sweat after 3 days of application was determined and compared with the test area where the preparation was not applied. The results were assessed as follows:

Sweat reduction: ++ very good + good - weak

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

Stiffness (50 ° C): ++ very good + satisfactory - oily, oil secretion

1 2 3 4 5 V1 V2 V3 V4 DC® Silicone 245 28 28 23 23 23 38 42 47 31 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®C18 20 20 20 - 20 20 - - 20 Lanette® 0 - - - 20 - - 10 12 - Eumulgin® B 3 3 3 3 3 3 3 3 3 - Cutina® E 24 PF - - - - 5 - - - - AHC 20 20 20 20 20 20 20 20 20 talc 8 8 8 8 8 8 8 8 8 Sweat reduction ++ ++ ++ + ++ + + + - Stiffness (50 ° C, 72 h) ++ ++ ++ ++ ++ ++ - + ++

-7The following commercial products were used:

Silicone® DC 245 Fluid: Eutanol® G16:

Cetiol® OE:

Ucon Fluid® AP:

Cutina® HR:

Lorol®C 18:

Lanette® O:

Eumulgin® B 3:

Cutina® E 24 PF:

AHC (aluminum chlorohydrate) dimethylcyclopentasiloxane

2-hexyldecanol di-n-octyl ether

PPG-14-butyl ether hydrated castor oil stearyl alcohol cetyl / stearyl alcohol (1: 1)

PEG-30-cetyl / stearyl ether

PEG-20 glyceryl stearate

Micro Dry® UF (Reheis / Inorganic)

Claims (6)

A solid antiperspirant comprising sweat inhibiting active ingredients dispersed in a mass having a stable shape at 40 ° C and spreadable on the skin, comprising: (A) 10 to 30% by weight of an aluminum, zirconium or zinc astringent salt, (B) 30 to 50% by weight of a liquid carrier component, (C) 18 to 30% by weight of reinforcing fatty or waxy components, m.p. (D) 1 to 20% by weight of water-soluble surfactants, characterized in that the liquid carrier component (B) comprises: 20 to 40% by weight of a nonpolar oil, preferably a low boiling silicone oil or a volatile silicone oil, 10 to 30% by weight of a polar oil selected from liquid, branched alkanols, alkanediols, ether alcohols and dialkyl ethers having from 12 to 24 carbon atoms each and from 2 to 30 moles of propylene oxide containing from 3 to 20 carbon atoms of mono- or polyhydric alkanols to the whole solid. Solid antiperspirant according to claim 1, characterized in that it contains as low-boiling dimethylpolysiloxane or volatile dimethylpolysiloxane, linear or cyclic dimethylpolysiloxane as a nonpolar oil. Solid antiperspirant according to claim 1 or 2, characterized in that it contains, as a polar oil, a single branched alkanol selected from 2-hexyldecanol, 2-octyldodecanol or mixtures of these alcohols with addition products of 2 to 20 moles of propylene oxide with alkanols. C 3 -C 20 carbon atoms. A solid antiperspirant according to any one of claims 1 to 3, characterized in that it contains saturated linear fatty acids or fatty alcohols having 14 to 22 carbon atoms as reinforcing fatty or waxy component, 9 9 triglycerides of saturated fatty acids of 14 to 22 carbon atoms, saturated linear wax esters of 28 to 44 carbon atoms or mixtures thereof. Solid antiperspirant according to any one of claims 1 to 4, characterized in that it contains as an astringent salt aluminum hydroxide of the formula Al 2 (OH) 5d * 2-3 H 2 O in an amount of 15 to 25% by weight. Solid antiperspirant according to any one of claims 1 to 5, characterized in that it additionally contains a fine particle filler selected from talc, silicic acid and mixtures in an amount of 1 to 20% by weight.