GB2299024A

GB2299024A - Antiperspirant containing an alkyl ester siloxane

Info

Publication number: GB2299024A
Application number: GB9605535A
Authority: GB
Inventors: Martinho Correia
Original assignee: Unilever PLC
Current assignee: Unilever PLC
Priority date: 1995-03-24
Filing date: 1996-03-15
Publication date: 1996-09-25
Anticipated expiration: 2016-03-15
Also published as: ZA961867B; AU4802496A; GB2299024B; AU695096B2; GB9506039D0; GB9605535D0

Abstract

An underarm composition suitable for topical application to the human skin, such as a cream, comprising an antiperspirant and/or deodorant active agent, a cosmetic vehicle, and an alkyl ester siloxane wax, preferably behenic acid silicone wax, of general formula (I); (Me 3 Si)O(SiMe 2 O) a Si(Me)(SiMe 3 )(CH 2 ) b -O-COR wherein ```a is an integer from O to 2 ```b is an integer from 2 to 4 ```Me is CH 3 ```R is straight or branched chain alkyl from C 10 H 21, to C 30 H 61 ```The composition may be an aerosol, cream or stick.

Description

UNDERARM COMPOSITIONS This invention relates to novel underarm compositions which contain a silicone wax material. More particularly, it refers to antiperspirant and deodorant compositions for topical application to the human skin, containing silicone ester wax compounds.

It is known for underarm compositions for topical application to contain non volatile silicone liquids. These compositions often contain polyorganosiloxanes, which impart desirable characteristics to the composition. In particular, they provide emolliency to the composition, and may also provide (in particular with antiperspirant compositions) a masking effect of any solids present in the composition once the volatile components have evaporated, but without causing any serious reduction in efficacy of the compositions.

Representative of this art is EP 28,853 (Procter & Gamble).

It is also known to include certain categories of alkyl siloxane waxes into underarm compositions. For example, in EP 549,223 (Dow Corning), there is described underarm formulations containing certain long chain alkyl silicone wax compositions. These waxes are alleged to provide the formulations with desirable characteristics, including modified hardness, reduced whitening, improved feel, and compatibility with other ingredients.

We have discovered that a further category of silicone wax compounds may advantageously be incorporated into underarm compositions for topical application. Such compositions may have superior properties to known compositions, in particular with regard to improved feel on application of the composition to the skin. Moreover, the compositions do not inhibit antiperspirant or deodorant efficacy.

Thus, according to a first aspect, the invention provides an underarm composition suitable for topical application to the human skin, comprising an antiperspirant and/or deodorant agent, a cosmetic vehicle, and an acyl ester siloxane wax of general formula (I); (Me3Si)O(SiMe20)Si(Me)(CH2) (OH)0C0R(SiMe3) wherein a is an integer from 0 to 2 b is an integer from 2 to 4 Me is CH3 R is straight or branched chain alkyl from C1oH2l to C30H61 Preferably, R is straight chain alkyl C19H39. In addition, preferably a is 1 and b is 3.

It has been found that antiperspirant and/or deodorant agent compositions containing the acyl ester siloxane wax described may have particularly good sensory properties, including good feel on the skin on application. The inclusion of such acyl ester siloxane waxes may also allow the compositions to be formulated without some of the other ingredients which are typically found in antiperspirant or deodorant compositions, or at least to reduce the amount of them required to produce an acceptable product. Such other ingredients, the amounts of which may be reduced or eliminated in the composition, include additional structurants, such as hydrophobic clays or silicas, volatile silicones, such as cyclomethicones, or non volatile silicones, such as dimethicones.

In addition, when the topical composition is in the form of an antiperspirant composition, the presence of the acyl ester siloxane wax may act to partially or totally mask any whiteness caused on the skin by the presence of the antiperspirant active salt.

Traditional underarm products often contain other ingredients to impart various characteristics to the final product.

These extra ingredients will also depend on the product form, which can typically be a stick, roll on lotion, cream, or propellant driven aerosol, to name a few.

For example, if the product according to the invention is an antiperspirant composition, the composition will typically include an antiperspirant salt. Typically used antiperspirant salts include inorganic and organic salts of aluminium and zirconium, and mixtures thereof. Particularly preferred are the aluminium, zirconium salts of aluminium halides, aluminium hydroxhalides, aluminium zirconium salts and mixtures thereof. Particularly preferred antiperspirant salts include so called activated aluminium chlorohydrate compounds, as for example are described in EP 6,739 (Unilever NV et al). Further antiperspirant active materials are described in EP 28,853, the contents of both of these applications being incorporated by reference.

For use in antiperspirant compositions, preferably the antiperspirant salt is present at a level of 5-30% by weight of the composition.

Compositions according to the invention may also preferably contain a volatile silicone material. Typically used volatile silicone materials include cyclic or linear polydimethylsiloxanes. Preferred cyclic polydimethylsiloxanes have from 3-6 silicone atoms, and a viscosity of less than 10 mm2s1(cSt) at 250C. Preferred linear polydimethylsiloxanes have from 3-9 silicone atoms, and a viscosity of less than 5 mms-l(cSt) at 250C. Preferred polydimethylsiloxanes are available for example from Dow Corning Corporation, under such names as Dow Corning 344 and 345. Preferably, if used in compositions according to the invention, the volatile silicone is present at a level of 3060% by weight, more preferably 40-60% by weight.

The silicone wax used in compositions according to the invention is an acyl ester silicone wax. The inclusion of this wax in the formulation may impart some emolliency to the composition; it may therefore be possible to do without, or reduce, the amount of emollient materials, such as volatile or non-volatile silicones, which are conventionally included in such compositions. In addition, the acyl ester waxes when used in compositions according to the invention may impart some structure to the composition, thereby avoiding the need for other structurants, or at least reducing the amounts that are needed.

A particularly preferred wax for use in compositions according to the invention is a behenic acid silicone wax, which in general structure I has a value for a of 1 and for b of 3, and in addition has R as C19H39. Such a wax is available from Rhone Poulenc under the tradename Mirasil-B 71649 wax.

Preferably, such acyl ester waxes are present in the composition at a level of 1-30%, more preferably 2-25% by weight of the composition.

Compositions according to the invention may take any convenient product form, including lotion, stick, cream, pump spray, or propellant driven aerosol.

A convenient form is a solid stick, which may conveniently be contained in a suitable holder or dispenser to enable it to be applied.

An alternative form is a lotion, which may conveniently be used in a roll ball dispenser, fitted with a ball valve, which may be applied to the skin in a conventional manner. A further possible composition would be a liquid suitable for dispensing from a finger operated pump spray or hand operated pump spray, which can deliver without the use of propellant gases a fine spray to the skin.

The composition can also take the form of a cream which is suitable or adapted for topical application to the skin.

A further possible product form is in the form of a liquid, which is suitable for application from a propellant driven aerosol by use of a suitable propellant, examples of which are well known in the art. It should be noted that, when the composition is in the form of a liquid to be applied from a propellant driven aerosol, the percentages of the components of the composition referred to, in particular the amount of alkyl ester siloxane wax in the composition, refer to the socalled "concentrate composition, before its dilution with propellant and dosage into the aerosol container.

Propellant driven aerosol compositions according to the invention will be packaged with an aerosol propellant. The propellant gas can be any liquefiable gas known in the art for use in aerosol containers. Examples of suitable propellants include trichlorofluoromethane, trichlorotrifluorethane, monochlorodifluorormethane, difluoroethane, propane, butane, isobutane, used singly or in combination. In such product forms, the composition according to the invention may typically comprise 5-45, and the propellant 55-95% by weight of the total composition.

Particularly preferred product forms of compositions according to the invention are creams, lotions, and sticks.

Compositions according to the invention may also include various optional ingredients, which will depend on the product type and form of the cosmetic product. Such optional ingredients include; - non-volatile silicones, such as dimethyl cyclosiloxanes or polydimethyl siloxane, eg, DOW CORNING 200 fluids; - deoperfumes and deodorant compounds which can act as antimicrobial agents, and generally provide the composition with a deodorant active capability; - skin feel improvers, such as talc and finely divided polyethylene, an example of which is Acumist B18; - humectants, such as polyols, for example glycerol; - hydrocarbon emollients, such as polydecenes; - hydrophobic oils such as liquid paraffins, or isopropyl myristate;; - thickening and gelling agents, such as clays, for example, Bentone 38, silicas, for example, Aerosil 200, organic waxes, such as castor wax, beeswax, or paraffin wax, silicone waxes, stearyl alcohol, fatty alcohols having 14-24 carbon atoms, fatty acids having 16-36 carbon atoms, and polyethylene; - perfumes; - preservatives and antioxidants; - skin benefit agents, such as allantoin; - colours; - other cosmetic adjuncts conventionally employed in stick, roll-on lotion, liquid spray, propellant driven aerosol, and cream products.

Preferably the composition is essentially anhydrous; that is it contains less than about 1% by weight of water.

Such optional ingredients conveniently make up the balance of the composition, and as such may typically comprise 10-95% by weight of the composition.

Examples The invention will now be described by way of example only.

Example 1 The following examples may be prepared by conventional techniques, and all provide satisfactory compositions according to the invention.

Suspension Cream Antiperspirant Component tw/w AZAG(1) 24.0 Behenic Acid Silicone Wax(2) 15.0 Cyclomethicone 55.0 Talc 6.0 (1) Q5-7167, activated aluminium zirconium glycinate, ex Summit.

(2) Mirasil-B 71649 wax, ex Rhone Poulenc.

Cream Antinerstirant Component %w/w AZAG(1) 24.0 Polyethylene 14.0 Behenic Acid Silicone Wax(2) 12.0 Cyclomethicone 50.0 Cream Antinerstirant Component %w/w AZAG(1) 26.0 Silica(3) 2.5 Propylene Carbonate 0.5 Cyclomethicone 63.0 Behenic Acid Silicone Wax 8.0 (3) Aerosil 200, ex Degussa.

Aerosol AntitersDirant /Deodorant Inaredient % wt.

Activated aluminium chlorohydrate 8.00 Bentone 38 4.00 Behenic Acid Silicone Wax (2) 6.00 Fragrance 4.00 Cyclomethicone 78.00 Base (concentrate) used as 25% by weight of formulation with 75% hydrocarbon propellant.

Shiah Efficacv Aerosol Antiterstirant Inaredient % wt.

Activated aluminium chlorohydrate 40.00 Bentone 38 4.00 Behenic Acid Silicone Wax (2) 6.00 Fragrance 4.00 Cyclomethicone 46.00 Base (concentrate) used as 25% by weight of formulation with 75% hydrocarbon propellant.

Aerosol Antisersclrant Inaredient % wt.

Aluminium chlorohydrate 30.00 Bentone 38 8.00 Behenic Acid Silicone Wax (2) 25.00 Fragrance 10.00 Isopropyl Myristate 2.00 Cyclomethicone 25.00 Base (concentrate) used as 23% by weight of formulation with 77% hydrocarbon propellant.

Aerosol Antiterstirant Inaredient % wt.

Activated aluminium chlorohydrate 8.00 Bentone 38 2.00 Ethanol 7. 50 Urea 0.50 Behenic Acid Silicone Wax (2) 2.00 Perfume 1.00 Pentane 36.00 CAP30 hydrocarbon propellant 43.00 High Efficacv Roll-On Antiterstirant Inaredient % wt.

Activated aluminium zirconium 25.00 tetrachlorohydrex glycine complex Behenic Acid Silicone Wax (2) 6.00 Volatile Silicone 57.50 Clay 3.00 Polyethylene 6.00 Propylene carbonate 1.00 Fumed silica 0.50 Fragrance 1.00 Roll-On Antiperspirant Inaredient wt.

Zirconium aluminium pentachlorohydrate 15.00 Clay 2.00 Ethanol 2.50 Fragrance 0.50 Behenic Acid Silicone Wax (2) 5.00 Cyclomethicone 75.00 Hiah Efficacv Stick Antinersnirant Ingredient t wt.

Activated aluminium zirconium 25.00 tetrachlorohydrex glycerine complex Behenic Acid Silicone Wax (2) 4.00 Cyclomethicone pentamer blend 43.00 Stearyl alcohol 20.00 Hydrogenated castor oil 4.00 PPG-14 Butyl ether 2.00 Magnesium aluminium silicate 1.00 Perfume 1.00 Unfraaranced Stick Antiperspirant Inaredient wt.

Activated aluminium zirconium 17.00 tetrachlorohydrex glycerine complex Behenic Acid Silicone Wax (2) 14.00 Cyclomethicone pentamer-tetramer blend 53.00 Hydrogenated castor oil 4.00 Glyceryl tribehenate 2.00 PPG-8 distearate 1.00 Stearyl alcohol 9.00 Stick Antiserssirant Inaredient t wt.

Aluminium chlorohydrate powder 20.00 Behenic Acid Silicone Wax (2) 20.00 Cyclomethicone tetramer blend 39.50 Behenyl alcohol 14.00 Silicone dioxide 1.00 C18-C36 triglycerides 4.00 Fragrance 1.50 Example 2 The following cream formulation was prepared; Component % w/w AZAG(1) 24.0 Behenic Acid Silicone Wax(2) 15.0 Talc Suprafino 6.0 Perfume 1.0 Volatile Silicone(4) 54.0 (4) DC Q2/1465, ex Dow Corning.

This composition is a cream, with good stability and sensory properties.

In contrast, a similar formulation containing DC580 (Stearoxytrimthyl silane and stearyl alcohol), in place of the Mirasil B71649, did not thicken well, or provide a cream with good properties.

Example 3 Comtarative Example Cream formulations A,B,C,D as described in Table I were prepared. Formulations A,B and C contained an acyl silicone wax while Formulation D contained an alkyl silicone wax.

The formulations were compared for sensory properties using a "smoothness to touch" attribute. A Quantitative Descriptive Analysis test was employed on a sensory profiling panel of users. The users applied a set target dose to their axilla and scored the attribute on a scale of 0-100.

The results are tabulated in Table II. As can be seen from Table II formulations A,B and C containing an acyl ester wax achieved significantly higher scores than Formulation D containing an alkyl silicone wax.

Example 4. Comnarative Example The following formulations were examined: % w/w Ingredient E F G H Behenic Acid Silicone Wax (2) 15 15 - AZAG 24 24 24 24 Volatile Silicone (4) 54 52 66 72 Talc 6 6 - Fragrance 1 1 - Silica - 2 - 4 Castorwax - - 10 Efficacy of each of the formulations was compared in standard tests carried out on users under Hot Room conditions.

The results are shown in tabular form in Table III. As shown in the Table Formulation E and F based on the acyl ester wax exhibited higher efficacy than formulations G and H based on castorwax and volatile silicone respectively. Moreover, the formulations E and F show that the use of an acyl ester wax is not detrimental to efficacy when compared with a simple silica/silicone based composition.

Example 5. Comcarative Example Formulations A and C were compared with an ethanol control roll-on for efficacy in terms of deodorancy. Scores were allotted by users for malodour after 24 hours. The results are given below: Formulation Malodour Score (Control) A 1.42 (2.46) C 1.35 (2.35) Accordingly, the acyl silicone ester products had lower malodour scores than the control thereby indicating a lack of interference in deodorant efficacy.

Claims

1. An underarm composition suitable for topical application to the human skin, comprising an antiperspirant and/or deodorant agent, a cosmetic vehicle, and an acyl ester siloxane wax of general formula (I); (Me3Si)0(SiMe0)Si(Me) (CH2)0C0R(SiMe3) wherein a is an integer from 0 to

2 b is an integer from 2 to 4 Me is CH R is straight or branched chain alkyl from C10H to C* oH, 2. An underarm composition according to claim 1, where the composition is an antiperspirant composition containing 5-30% by weight of an antiperspirant agent.

3. An underarm composition according to claim 1 or claim 2, wherein R is straight chain alkyl Cl9 H39, a is 1 and b is 3.

4. An underarm composition according to any of the preceding claims, wherein the composition additionally comprises 30-60% by weight of a volatile silicone.

5. An underarm composition according to any of the preceding claims, wherein the acyl ester siloxane wax is present at a level of 1-30% by weight of the composition.

6. An underarm composition according to any of the preceding claims, wherein the composition is in the form of a cream, lotion or stick.