CN116600769A - Antiperspirant Composition - Google Patents

Abstract

The present invention relates to an anhydrous antiperspirant (AP) composition comprising conventional metal-based AP actives, natural oils, antioxidants and selected nonionic surfactants when such compositions are applied to the body The composition ensures little or no yellow staining of fabrics worn by an individual through multiple use-wash-rinse-dry cycles when applied to areas such as the armpits.

Description

Antiperspirant Composition

technical field

The present invention relates to antiperspirant (AP) compositions. The present invention more particularly relates to anhydrous antiperspirant compositions comprising conventional metal-based AP actives and natural oils, which ensure protection against the skin of fabrics when such compositions are applied to parts of the body such as the armpits. There was little or no yellow staining of the fabric upon repeated use through several use-wash-rinse-dry cycles. The preferred form of such products is as an aerosol or in stick form.

Background technique

The present invention relates to substantially anhydrous compositions, such as those containing antiperspirant actives. Such actives are added to compositions to reduce perspiration applied to the surface of the body, particularly the underarm area of the human body, the armpits. The antiperspirant actives used hitherto are generally astringent metal salts, eg aluminum or zirconium salts, for example aluminum chlorohydrates or aluminum sesquichlorohydrates. Such compositions also include natural oils, such as sunflower oil, which may be unsaturated, for delivering skin care benefits. Because such oils are unsaturated, antioxidants are typically added to such compositions to minimize oxidation of these compounds, ensuring minimal color formation. Typically, antioxidants have been used such as ascorbic acid, butylated hydroxytoluene (BHT) and other commercially available compounds such as Tinogard TT (pentaerythritol tetra-di-tert-butyl hydroxyhydrocinnamate) or Tinogard Q (tris-(tetra methylhydroxy-piperidinol) citrate), both from BASF. The present inventors have found that when such compositions are applied to the underarm area, the fabrics that come into contact with the composition tend to suffer from repeated use (where the fabric can be washed, rinsed and dried between uses) ) is contaminated.

The inventors have found that when included in such anhydrous AP compositions such as those in stick or aerosol form, nonionic surfactants with a particular low HLB tend to make the nonionic surfactants Contamination problems are reduced to a minimum. Surfactants are usually included in aqueous compositions to emulsify oily components. To the best of the inventors' knowledge, there is no motivation to include nonionic surfactants in such anhydrous compositions, nor have nonionic surfactants been added.

The applicant has solved the problem of staining of fabrics when using antiperspirant compositions, which usually contain water and contain metal based antiperspirant Perspiration actives and natural oils. In the present invention, they provide a solution to this problem, especially for essentially anhydrous compositions, through the incorporation of nonionic surfactants with specific low HLB values.

Examples of already including nonionic surfactants in AP compositions are generally in aqueous compositions as emulsifiers, or in specific compositions where the nonionic surfactant has a high HLB value.

US2006115441 (Unilever) discloses in specific examples antiperspirant compositions containing aluminum chlorohydrate, sunflower oil, BHT, non-ionic surfactants stearth 2 and stearth 20, but this is at a water content above 60% composition.

US2009324317 (Unilever) discloses a dispenser for anhydrous cosmetic products configured to minimize photodamage to the ingredients therein, wherein in one embodiment a composition is disclosed comprising aluminum chloride hydroxy , sunflower oil, BHT and nonionic stearth 100 with an HLB of 18.8.

Therefore, there is no known prior art teaching a solution to the current problem of using low HLB (less than 11) nonionic surfactants in anhydrous AP compositions.

Accordingly, it is an object of the present invention to provide anhydrous antiperspirant compositions comprising metal-based antiperspirant actives and natural oils which, when combined by the use of such antiperspirants The problem of staining or yellowing of fabrics worn by individuals of clothing and subjected to repeated use-wash-rinse-dry cycles is minimized.

Contents of the invention

According to a first aspect of the present invention there is provided an antiperspirant composition comprising:

(a) metal-based antiperspirant actives;

(b) natural oils comprising glycerides of unsaturated carboxylic acids/fatty acids;

(c) antioxidant compounds;

(d) nonionic surfactants having an HLB of less than 11; and

(e) less than 10% by weight water.

According to another aspect of the present invention there is provided a method of minimizing staining or yellow staining of fabric worn by an individual, said method comprising the steps of: (a) applying a composition of the present invention to said individual A body part, preferably the armpits, followed by (b) washing the fabric, (c) rinsing the fabric and (d) drying the fabric.

Detailed ways

These and other aspects, features and advantages will become apparent to those of ordinary skill in the art from a reading of the following detailed description and the appended claims. For the avoidance of doubt any feature of one aspect of the invention may be used in any other aspect of the invention. The word "comprising" means "including," but not necessarily "consisting of" or "consisting of." In other words, the steps or options listed need not be exhaustive. It should be noted that the examples given in the following description are intended to clarify the present invention and are not intended to limit the present invention to the examples themselves. Similarly, all percentages are weight/weight percentages unless otherwise indicated. Except in the examples and comparative examples, or in the case where it is clearly stated otherwise, all numerical values expressing amounts of materials or conditions of reactions, physical properties of materials and/or uses in this specification and claims should be understood as "about" modification. Numerical ranges expressed in the format "from x to y" are understood to include x and y. When multiple preferred ranges are described in the format "from x to y" for a particular feature, it is to be understood that all ranges combining the different endpoints are also contemplated.

The compositions of the present invention are generally "personal care compositions" suitable for the uses detailed below. Furthermore, the use of the compositions of the invention is generally for cosmetic or non-therapeutic use.

In some embodiments of the invention, the composition is useful for the therapeutic treatment of hyperhidrosis (extreme sweating).

"Antiperspirant composition" as used herein is meant to include compositions intended for topical application to the skin of mammals, especially humans. Such compositions are preferably of the leave-on type. A leave-on composition refers to a composition that is applied to the desired skin surface and left on for a period of time (eg, 1 minute to 24 hours), after which it can be wiped or rinsed off with water, typically during the normal course of personal washing. The composition may also be formulated as a product applied to the human body for improved appearance, cleansing, odor control or general aesthetics. The composition of the invention may be in the form of a liquid, foam, spray, aerosol, gel or stick. "Skin" as used herein is meant to include skin on any part of the body (eg, neck, chest, back, arms, underarms, hands, legs, buttocks, and scalp), especially the underarms.

The compositions of the present invention are substantially anhydrous. "Anhydrous" means that the composition contains no added water. However, the composition may contain some water which is contained in the composition from the ingredients formulated to form the composition. The water content may also be the result of ingress of water from humidity in the atmosphere, which water content is in equilibrium with the components of the composition. In practice, the composition comprises less than 10%, preferably less than 5%, additionally preferably less than 2%, most preferably less than 0.5% by weight of water, based on the weight of said composition.

Antiperspirant compositions according to the present invention comprise a metal-based antiperspirant active. This may be selected from aluminum salts, zirconium salts or mixed aluminum/zirconium salts, preferably aluminum chloride hydroxy, aluminum tetrachlorohydrin-zirconium glycine complex, aluminum octachlorohydrin-zirconium glycine Aluminum-zirconium hydroxychloride, aluminum sesquichlorohydrin or mixtures thereof.

Antiperspirant actives for use herein are selected from aluminum, zirconium and mixed aluminum/zirconium salts, including both inorganic salts and salts with organic anions and complexes. Particularly preferred astringent salts are halohydrate salts, especially chlorohydrate salts, optionally activated. For aerosol compositions, the antiperspirant active is preferably free of zirconium.

Aluminum halohydrates are usually defined by the general formula Al ₂ (OH) _x Q _y .wH ₂ O, wherein Q represents a halogen selected from chlorine, bromine, iodine or a mixture thereof, and x is between 2 and 5 Varies, and x+y=6, while wH ₂ O represents a variable amount of hydration. Particularly effective aluminum halohydroxide salts known as activated aluminum chlorohydroxides are described in EP-A-6739 (Unilever NV et al), the content of which specification is incorporated herein by reference.

The term "aluminum chlorohydrate" as used herein includes materials having specific values of x and y, such as aluminum sesquichlorohydrate and materials in which the hydroxychloride exists as a complex. It should be recognized that alternative names are sometimes used to indicate the presence of hydroxy substitution, including aluminum hydroxychloride, aluminum oxychloride, or aluminum hydroxychloride.

Zirconium astringent salts useful herein as metal-based antiperspirant actives can generally be represented by the empirical general formula ZrO(OH) _2n-nz B _z .wH ₂ O, where z is a variable from 0.9 to 2.0 such that 2n -nz has a value of zero or a positive value, n is the valency of B, and B is selected from chloride, other halide, sulfamate, sulfate, or mixtures thereof. Possible different degrees of hydration values are indicated by _wH2O . Preferably, B represents chloride. Preferably, the variable z is in the range of 1.5 to 1.87. In practice, such zirconium salts are generally not used alone, but as components of combined aluminum and zirconium based antiperspirant actives.

The aforementioned aluminum and zirconium salts may have coordination water and/or bound water in various amounts, and/or may exist in the form of polymeric substances, mixtures or complexes. In particular, zirconium hydroxy salts generally represent a series of salts with different amounts of hydroxyl groups. Aluminum zirconium chlorohydrin may be particularly preferred.

Antiperspirant complexes based on the above-mentioned astringent aluminum and/or zirconium salts are useful as metal-based antiperspirant actives. Complexes generally use compounds with carboxylate groups, which are advantageously amino acids. Examples of suitable amino acids include dl-tryptophan, dl-β-phenylalanine, dl-valine, dl-methionine and β-alanine, and preferably have the formula _CH2 ( _NH2 ) Glycine of COOH. Some of these Al/Zr complexes are commonly referred to in the literature as ZAG. ZAG actives generally contain aluminum, zirconium and chloride, have an Al/Zr ratio of 2 to 10, especially 2 to 6, an Al/Cl ratio of 2.1 to 0.9 and variable amounts of glycine. Such preferred types of actives are available from Westwood, from Summit and from Reheis. Alternatively, the complexes may be preformed with polyaliphatic alcohols such as propylene glycol or glycerol. The complex with chlorohydrate is usually called chlorohydrex.

Mixtures of two or more astringent salts can be used, however, particular preference is given to using zirconium-free astringent salts, such as the aluminum chlorohydroxides and the so-called activated aluminum chlorohydrates.

According to a particularly preferred aspect of the present invention, the antiperspirant active is aluminum chlorohydrate, aluminum sesquichlorohydrex or mixtures thereof. The metal based antiperspirant active preferably comprises from 1% to 50%, more preferably from 2% to 25%, most preferably from 2% to 15% by weight of the composition.

The antiperspirant composition comprises natural oils. The natural oil is preferably at least one selected from coriander seed oil, borage seed oil, evening primrose oil, corn oil, sunflower oil, safflower oil, coconut oil, algae oil or mixtures thereof. More preferred natural oils are sunflower oil, algae oil or coconut oil, preferably sunflower oil. The natural oil is preferably present in an amount of 1% to 10% by weight, more preferably 1% to 5% by weight of the composition.

The antiperspirant composition includes an antioxidant compound. Suitable and conventional antioxidants normally included in such compositions may be added in the present invention. Such antioxidants are preferably selected from one or more of the following: butyl hydroxytoluene or its derivatives, pentaerythritol tetra-di-tert-butyl hydroxyhydrocinnamate (sold as Tinogard TT), or dilauryl Alcoholthiodipropionate (sold as Tinogard DA), tetramethylhydroxypiperidinol citrate (sold as Tinogard Q), tocopheryl acetate or ascorbic acid and its derivatives. The antiperspirant composition preferably comprises 0.001% to 10% by weight of the composition, more preferably 0.01% to 5% by weight, most preferably 0.01% to 2% by weight of an antioxidant .

The compositions of the present invention comprise a nonionic surfactant, preferably selected from the group consisting of polyoxyethylene sorbitan alkyl esters (sold as Tween Surfactants), fatty alcohol ethoxylates (sold as Tween Surfactants), Brij surfactants) or sorbitan monoesters (sold as Span surfactants), alkyl polyglucosides, or _C8 - _C16 fatty alcohol glycosides; the nonionic surfactants have an HLB of less than 11.0.

Accordingly, any nonionic surfactant having an HLB value of less than 11.0 may be used in the compositions of the present invention.

HLB is the hydrophilic-lipophilic balance, calculated using Griffin's method, where HLB = 20 x Mh/M, where Mh is the molecular weight of the hydrophilic portion of the molecule and M is the molecular weight of the entire molecule, given on an arbitrary scale from 0 to 20 result.

A non-exhaustive list of nonionic surfactants having an HLB value of less than 11 is given below, where the HLB value is in parentheses.

Ethylene Glycol Distearate (1), Sorbitan Trioleate (1.8), Propylene Glycol Isostearate (2.5), Ethylene Glycol Stearate (2.9), Sorbitan Times Hemioleate (3.7), Glyceryl Stearate (3.8), Lecithin (4), Sorbitan Oleate (4.3), Sorbitan Monostearate NF (4.7), Sorbitan Sugar Alcohol Stearate (4.7), Sorbitan Isostearate (4.7), Steareth-2 (Steareth-2) (4.9), Oleth-2 (Oleth-2) (4.9), Glyceryl Laurate (5.2), Ceteth-2 (Ceteth-2) (5.3), PEG-30 Dipolyhydroxystearate (5.5), Glyceryl Stearate SE (5.8 ), Sorbitan Stearate (and) Sucrose Cocoate (6), PEG-4 Dilaurate (6), Methyl Glucose Sesquistearate (6.6), PEG-8 Dilaurate Oleate (8), Sorbitan Laurate (8.6), PEG-40 Sorbitan Whole Oleate (9), Laureth-4 (Laureth-4) (9.7), PEG- 7 Glyceryl Cocoate (10), PEG-20 Almond Glycerides (10) and PEG-25 Hydrogenated Castor Oil (10.8).

The most preferred nonionic surfactants for use in the present invention are selected from the group consisting of polyethylene glycol lauryl ether (sold as Brij L4), steareth-2 (sold as Brij S2), tris(oxyethylene) Lauryl ether (sold as EO3), or a combination of EO3 and hepta(oxyethylene)lauryl ether (sold as EO7). Nonionic surfactants preferably comprise from 0.5% to 5% by weight of the composition.

Without wishing to be bound by theory, the inventors believe that the hydrophilic-lipophilic balance (HLB) of surfactants plays a role in the solubilization of oil during decontamination due to reduced interfacial tension and oil/water/fiber contact points. important role. Surfactants with low HLB values are expected to effectively solubilize oils compared to surfactants with high HLB values, which interact with certain ingredients in the composition to provide this benefit. Benefits of Invention.

The compositions of the invention are preferably delivered as a product in aerosol form or in stick form.

The compositions of the present invention preferably comprise a topically acceptable carrier, which in the present invention is anhydrous. To achieve this, the anhydrous carrier preferably contains silicone compounds, alcohols or waxes. Alcohols, when used, may be low boiling point ( _C2 to _C4 ) alcohols or polyols, preferably polyols.

The compositions of the invention preferably comprise polyols. Polyhydric alcohol (polyhydric alcohol) is also referred to as polyol (polyol). The polyols according to the invention are compounds having two or more hydroxyl groups. Suitable classes of polyols that may be included in the compositions of the invention are monomeric polyols, polyalkylene glycols or sugars. Preferred monomeric polyols are glycols; alkylene glycols, such as propylene glycol; glycerol; or xylitol, more preferably propylene glycol.

Suitable polyalkylene glycols are polyethylene glycol or polypropylene glycol. The saccharides used for inclusion in the present invention may be in monomeric, dimeric, trimeric or polymeric form. Preferred sugars include glucose, fructose, mannose, sucrose, threitol, erythritol, sorbitol, mannitol, galactitol, adonitol, dextran or cyclodextrin. Among them, more preferable sugars are glucose, fructose, sucrose, sorbitol, mannitol, adonitol, dextran or cyclodextrin.

Other ingredients commonly included in conventional antiperspirant compositions may also be incorporated into the compositions of the present invention. These components include skin care agents such as emollients, moisturizers and skin barrier boosters; skin appearance modifying agents such as skin lightening and skin smoothing agents; antimicrobial agents, especially organic antimicrobial agents, and preservatives.

Broadly speaking, the antiperspirant composition can be cosmetically and topically applied to the skin by one of two methods. Some consumers prefer one method, others the other. In one method, sometimes called the contact method, the composition is wiped on the surface of the skin, depositing a portion of the composition as it passes. In a second method, sometimes called the non-contact method, the composition is sprayed from a dispenser held adjacent to the skin, usually in an area of about 10 ^cm2 to 20 ^cm2 . The spray can be formed by a mechanical device that generates pressure on the contents of the dispenser, such as a pump or a squeezable sidewall, or by internally generated pressure caused by volatilization of a portion of the liquefied propellant, which is commonly referred to as a for the sprayer.

Broadly speaking, there are two classes of contact compositions, one of which is liquid and is usually applied using a roll-on dispenser, or may be absorbed into or onto the wipe, and in which In the second class, the antiperspirant active is distributed in a carrier liquid which forms a continuous phase which has gelled. In one variant, the carrier liquid contains the solvent for the antiperspirant, while in a second variant the antiperspirant maintains a particulate solid suspended in an oil, usually a blend of oils.

stick or soft solid composition

Many different materials have been proposed as gelling agents for the continuous oil phase, including waxes, small molecule gelling agents, and polymers. Each of these has its advantages, the most popular class of gelling agents has included waxes, at least in part due to their ready availability and ease of processing, particularly linear fatty alcohol wax gelling agents. Gel antiperspirant compositions are applied topically to the skin by rubbing it over the skin and contacting the skin, thereby depositing a film on the skin.

The nature of the film depends largely on the gelling agent used. Although waxy fatty alcohols have been used as gelling agents for many years and are effective for gelling purposes, the resulting products are rather ineffective in improving the visual appearance of the skin to which the composition has been applied, particularly underarm skin. This problem has been addressed by the inclusion of ameliorating materials such as di- or polyhydroxy humectants and/or triglyceride oils.

Ball type

Broadly speaking, liquid compositions that can be applied from a roll-on can be divided into two categories, namely those in which the antiperspirant active is suspended in a hydrophobic carrier such as a volatile silicone, and those in which the antiperspirant active is dissolved. those in a carrier liquid. The latter has proven to be more popular. There are mainly two types of dissolving carrier liquids, namely mainly alcoholic carriers, ie most dissolving carrier liquids contain ethanol, and the second type, wherein the carrier liquid is mainly water. Since the present invention relates to hydrophobic compositions, the former is used. The former is very popular because ethanol is a mild fungicide in its own right.

Aerosol composition

The antiperspirant composition may be delivered by an aerosol composition comprising, in addition to the other ingredients described above, a propellant. Typically, the propellant is used in a weight ratio to the base formulation of 95:5 to 5:95. Depending on the propellant, in such aerosol compositions the ratio of propellant to base formulation is usually at least 20:80, usually at least 30:70, especially at least 40:60, in many formulations, by weight The ratio is 90:10 to 50:50. A ratio range of 70:30 to 90:10 is sometimes preferred.

Propellants in this context are generally one of three classes; i) low boiling gases liquefied by compression, ii) volatile ethers and iii) compressed non-oxidizing gases.

Class i) are generally low boiling substances, usually boiling below -5°C, usually below -15°C, especially alkanes and/or halogenated hydrocarbons. Such propellants typically liquefy under pressure in an aerosol can and vaporize to generate pressure to expel the composition from the can. Examples of suitable alkanes include in particular propane, butane or isobutane. The second class of propellants includes very volatile ethers, of which the most widely used ether by far is dimethyl ether. Such propellants may advantageously be used at relatively low weight ratios of propellant to base formulation, for example as low as 5:95. It can also be used in admixture with, for example, compressible/liquefiable alkane gases. A third class of propellants includes compressed non-oxidizing gases, especially carbon dioxide or nitrogen. Inert gases such as neon are theoretical alternatives.

The compositions of the present invention may comprise a wide variety of other optional components. CTFA Personal Care Ingredient Handbook, Second Edition, 1992 describes a wide variety of non-limiting personal care and pharmaceutical ingredients commonly used in the skin care industry, which are suitable for use in the compositions of the present invention , the entire contents of which are incorporated herein by reference. Examples include binders, biological additives, buffers, colorants, thickeners, polymers, astringents, fragrances, conditioners, exfoliants, pH adjusters, preservatives, natural extracts, essential oils, skin sensates (sensate), skin soother and skin healer.

According to another aspect of the present invention there is provided a method of minimizing staining or yellow staining of fabrics, said method comprising the steps of: (a) applying a composition of the present invention, preferably to the armpits of an individual, followed by (b) washing the fabric, (c) rinsing the fabric and (d) drying the fabric.

The composition is preferably applied to the armpits. The method is also preferably non-therapeutic or for cosmetic applications.

The invention will now be illustrated with the aid of the following non-limiting examples.

Example

Antiperspirant aerosol compositions were prepared as shown in Table 1 below:

Table 1

Element weight% Cyclopentasiloxane 2.5 PPG 14 butyl ether 3 Sunflower seed oil 0.5 BHT 0.1 Aluminum Chlorohydrate 5.5 Distearyldimethylammonium Hectorite 0.6 Propylene carbonate 0.015 C12-15 Alkyl Benzoate 0.5 Octyldodecanol 0.12 Nonionic Surfactant, Type and Concentration See table below; 2 Butane, Isobutane, Propane to 100

Examples A, B, 1-3: Effect of HLB of Nonionic Surfactants

The effect of including different types of nonionic surfactants as in Table-2 in the compositions as given in Table-1 was studied and the cleaning efficacy was measured following the protocol given below. Also given in Table 2 are the measurements of the yellowing Δb* after 2 wash cycles.

Scenarios for Evaluation

In this study, fabric samples of 10 × 10 ^cm2 were taken. 0.3 g of APA base formulation containing 0.05 g of the model sebum mixture was applied to a central circular area corresponding to 33 cm ² . The study was repeated five times. The treated samples were incubated in a hot air oven at 45 °C for 12 h.

The treated fabrics were washed in an IFB front load washing machine programmed with a wash and two rinses. The treated fabric was stapled to clean, air-dried polycotton ballast to obtain a load of approximately 2±0.1 kg and placed into the washing machine. Water hardness was maintained at 24fH water 2:1, Ca:Mg. Add 36g of either Surf Excel QuickWash powder detergent or Persil Non-Bio Liquid detergent to the ingredients compartment. The samples were dried at room temperature (25° C.) for 10 days using a wire drying method.

A Konika Minolta Spectrophotometer Model-2600d was used to measure the staining intensity on the samples. L*, a*, b* were measured at three different areas of the stained and untreated fabric. Δb* and ΔE* were subsequently calculated.

Table 2:

The data in the table above show, as evidenced by the low Δb* values, that non-ionic compounds with an HLB of less than 11 The combination of surfactants provided much better whitening.

Examples C-E, 4: Increases obtained with other nonionic surfactants in experiments completing four wash cycles white

Experiments similar to those in Table 2 above were performed with other surfactants and with four wash cycles. The data is summarized in Table-3 below:

table 3

The INCI name of Brij 58 is Ceteth-20

The data in Table-3 above also confirm the same finding, compared to compositions with high HLB (>11) surfactants or no surfactants at all, compositions containing nonionic surfactants with an HLB of less than 11 The composition provides much better stain removal.

Examples F-H, 5-7: Experiments with different ratios of non-ionic surfactants in the completion of three wash cycles Whitening obtained by combination of agents

Experiments similar to those in Table 3 above were performed with three wash cycles using certain surfactants at different ratios. The data is summarized in Table-4 below:

Table 4

Example Surfactant Surfactant (weight%) HLB Δb f - - - 3.70 G EO7 2 12.0 2.00 h EO3:EO7 (1:3) 2 11.0 2.53 5 EO3 2 8.2 1.60 6 EO3:EO7 (1:1) 2 10.0 1.24 7 EO3:EO7 (3:1) 2 9.12 1.74

The data in Table-4 confirm the same findings as in the previous tables.

Example J, 8-10: Experiments with different concentrations of nonionic surfactant in two wash cycles The combination of whitening obtained

Experiments similar to those in Table 4 above were performed with two wash cycles using combinations of surfactants at different concentrations. The data is summarized in Table-5 below:

table 5

Example Surfactant Surfactant (weight%) HLB Δb* J - - - 3.89 8 EO3:EO7 (1:1) 0.5 10.1 2.82 9 EO3:EO7 (1:1) 1.0 10.1 1.95 10 EO3:EO7 (1:1) 2.0 10.1 1.44

The data in Table-5 above show that combinations comprising different concentrations of nonionic surfactants give the desired whitening effect, with higher concentrations of 1-2% by weight being preferred.

Examples K-N and 11: Whitening obtained with anhydrous compositions of the present invention compared to high water content compositions

High water content roll-on compositions were prepared as shown in Table-6 below:

Table-6

Element weight% Aluminum Chlorohydrate 12.0 Sunflower seed oil 2.0 Silica dimethyl silylate 0.7 Tinogard TT 0.05 essence 1.0 water to 100 Nonionic Surfactant, Type See Table-7 below

Using the base formulation of Table-1 (aerosol, anhydrous composition) or the base formulation of Table-6 (aqueous roll-on composition), the following compositions were prepared. As already mentioned above, the whitening provided by the respective compositions was measured and the Δb* data are summarized in Table 7 below:

Table-7:

Example combination Surfactant (weight%) Δb* K as in table-1 - 5.38 L as in Table-6 - (**) m As in Table-6 + Brij S2 2.6 2.46 N As in Table-6 + Brij S2 5.2 2.27 11 As in Table-1 + Brij S2 2.6 1.97

(**) Due to the absence of surfactant in the aqueous and oily formulations, the formulations were unstable. Surfactants are necessary to stabilize the emulsion.

The data in the above Table-7 shows that the present invention is effective only on anhydrous compositions (Example-11), but not on aqueous compositions (Examples M and N).

Claims (14)

1. An antiperspirant composition comprising:

a) Metal-based antiperspirant actives;

b) A natural oil comprising glycerides of unsaturated carboxylic acids/fatty acids;

c) An antioxidant compound;

d) A nonionic surfactant having an HLB of less than 11; and

e) Less than 10% by weight of water.

2. The antiperspirant composition of claim 1, wherein the nonionic surfactant is selected from polyoxyethylene sorbitan alkyl esters (sold as Tween surfactants), fatty alcohol ethoxylates (sold as Brij surfactants) or sorbitan monoesters (sold as Span surfactants), alkyl polyglucosides, or C8-C16 fatty alcohol glycosides; the nonionic surfactant has an HLB of less than 11.0.

3. The antiperspirant composition of claim 2, wherein the nonionic surfactant is selected from Brij L4, brij S2, EO3, or a combination of EO3 and EO 7.

4. An antiperspirant composition according to any of the preceding claims, wherein the nonionic surfactant is present in an amount of from 0.5 to 5% by weight of the composition.

5. The antiperspirant composition according to any of the preceding claims, wherein the metal-based antiperspirant active is selected from aluminium salts, zirconium salts or mixed aluminium/zirconium salts, preferably selected from aluminium chlorohydroxy, aluminium-zirconium glycine complexes, aluminium-zirconium octachlorohydroxy glycine complexes, aluminium-zirconium pentachlorohydroxy, aluminium sesquichloride or mixtures thereof.

6. The antiperspirant composition of claim 5, wherein the metal-based antiperspirant active is aluminum hydroxychloride, or a mixture thereof.

7. The antiperspirant composition according to any of the preceding claims, comprising from 1 to 50% by weight of the composition of a metal-based antiperspirant active.

8. The antiperspirant composition according to any of the preceding claims, wherein the natural oil is selected from at least one of coriander seed oil, borage seed oil, evening primrose oil, corn oil, sunflower oil, safflower oil, coconut oil, and algae oil.

9. An antiperspirant composition according to claim 8, wherein the natural oil is sunflower oil, algae oil or coconut oil, preferably sunflower oil.

10. The antiperspirant composition according to any of the preceding claims, comprising from 0.1 to 10% by weight of the composition of natural oil.

11. The antiperspirant composition according to any of the preceding claims, wherein the antioxidant is selected from butyl hydroxytoluene, pentaerythritol tetra-di-t-butyl hydroxyhydrocinnamate (sold as Tinogard TT), or dilaurylthiodipropionate (sold as Tinogard DA).

12. The antiperspirant composition according to any of the preceding claims, comprising from 0.01 to 2% by weight of the composition of an antioxidant compound.

13. The antiperspirant composition according to any of the preceding claims, delivered in stick form or in an aerosol canister.

14. A method of minimizing staining or yellow coloration of fabric worn by an individual, the method comprising the steps of: (a) applying the composition according to any of the preceding claims to a body part, preferably an armpit, of the individual, followed by (b) washing the fabric, (c) rinsing the fabric and (d) drying the fabric.