AU5392901A - Methods of making low residue antiperspirant gel-solid stick compositions - Google Patents

Description

AUSTRALIA

Patents Act COMPLETE SPECIFICATION

(ORIGINAL)

Class Int. Class Application Number: Lodged: Complete Specification Lodged: Accepted: Published: Priority Related Art: Name of Applicant: The Procter Gamble Company Actual Inventor(s): John Michael Gardlik, Gerald John Guskey, Curtis Bobby Motley Address for Service: PHILLIPS ORMONDE FITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street Melbourne 3000 AUSTRALIA Invention Title: METHODS OF MAKING LOW RESIDUE ANTIPERSPIRANT GEL-SOLID STICK

COMPOSITIONS

Our Ref: 645693 POF Code: 44135/44135 The following statement is a full description of this invention, including the best method of performing it known to applicant(s): METHODS OF MAKING LOW RESIDUE ANTIPERSPIRANT GEL-SOLID STICK COMPOSITIONS The present application is a divisional application from Australian patent application number 56241/98 the entire disclosure of which is incorporated herein by reference.

TECHNICAL FIELD The present invention relates to methods of making antiperspirant compositions in the form of gelsolid sticks. In particular, the present invention relates to methods of making antiperspirant gel-solid sticks having a select product hardness, visible residue index, and rheology profile, and preferably having a crystalline gel matrix containing small and/or elongated crystalline particles. The antiperspirant gel-solid stick compositions made in accordance with the methods herein provide improved low residue performance. efficacy and aesthetics.

BACKGROUND OF THE INVENTION There are many types of topical antiperspirant products that are commercially available or otherwise known in the antiperspirant art. Most of these products are formulated as aerosol or pump sprays, roll-on liquids, creams, emulsions, gels, gel-solids, or other solid stick formulations, and comprise an astringent material, e.g. zirconium or aluminum salts or combinations thereof, incorporated into a suitable carrier. These products are designed to provide effective perspiration and odor control while also being cosmetically acceptable during and after application onto the axillary area or other areas of the skin.

Within this product group, solid antiperspirant sticks have become especially popular among consumers. These antiperspirant sticks comprise a solid matrix within which the antiperspirant active material is contained. The active can be solubilized in a liquid carrier comprising water. glycols and/or other alcohols, or maintained within a solid matrix as dispersed solids in an anhydrous system. The solid sticks which contain dissolved active often provide some low residue performance, but tend to be wet or sticky during and immediately after application to the skin. and more importantly, are often not as effective in providing antiperspirant and deodorant performance as solid sticks containing dispersed paniculate "active. Although the antiperspirant sticks which contain paniculate actives are more effective, they also tend to leave a higher visible residue on the skin.

There have been many attempts at producing anhydrous antiperspirant sticks which contain dispersed paniculate antiperspirant active, and which also provide improved efficacy and low residue performance during and after application to the skin, or which otherwise provide product clarity prior to (as a packaged product) or after such application (as a clear or low-residue film on the skin).

One such attempt involves the combination of paniculate antiperspirant active, gellants and liquid carrier in a gel stick, wherein all such components in the combination have matching refractive indices.

Refractive index matching allows for more passage of light through the gel stick with less scattering of the light, thus resulting in products which appear more clear or translucent as a packaged composition or when initially applied topically to the skin. These gel sticks, however, are expensive to make due to the cost of using raw materials having only select matching refractive indices. These compositions are also very difficult to formulate given that refractive index matching for a three component system (particulate active, solvent and gellant) is extremely difficult, and greatly limits the materials that can be used to prepare such a formulation.

Another attempt at making low residue antiperspirant sticks involves the use of gellants such as dibenzylidene alditols. These gellants, however, like many other gellants known in the an, are not acid stable and therefore tend to interact with the antiperspirant active due to the acidic nature of the active.

This interaction can result in reduced efficacy of the active, poor gel formation, and lower gel stability over extended periods during shipping or storage. This interaction may also cause processing difficulties at the temperatures and holding times often used during the formulation and manufacturing process. These gellants are also commonly used in combination with glycol carriers or other solvents which tend to be wet and sticky and irritating to the skin.

Yet another attempt at making low residue antiperspirant sticks involves the use of residue masking agents such as non-volatile paraffinic hydrocarbon fluids, phenyl trimethicone, low melting point waxes and combinations thereof. These agents are used in combination with stearyl alcohol or other high residue waxes commonly used in solid antiperspirant sticks. These agents help reduce visible residue during and immediately after application of the solid stick to the skin, but also tend to be associated with an oily or sticky skin feeling during application. Moreover, although the visible residue is reduced in such compositions, there remains a visible residue on the skin when used in combination with high residue waxes such as stearyl alcohol, and this reduced residue is still more visible or apparent than the topical Qresidue left by antiperspirant sticks which contain solubilized antiperspirant active.

Other attempts at improving low residue performance from an antiperspirant composition has focused on the use of anhydrous antiperspirant creams. These creams can be applied to the skin by conventional means, or by a cream applicator device, and results in very low residue during and immediately after application to the skin. These compositions comprise paniculate active dispersed throughout an anhydrous carrier, and either contained within a solid-like matrix or thickened with an inorganic or polymeric gellant or thickening agent. Many consumers, however, still prefer the convenience of using a solid antiperspirant stick, even if the solid stick tends to leave a higher visible residue on the skin.

A recent method of making low residue antiperspirant sticks is described in U.S. Patent 5,429,816, issued to Hofrichter et al. on July 4, 1995, which description is hereby incorporated by reference herein. The antiperspirant sticks provide low visible residue during and immediately after application to the skin, and are physically and chemically stable over extended periods of time. The improved antiperspirant sticks comprise a dual gellant system having a primary gellant such as 12hydroxystearic acid or esters or amides thereof and a secondary gellant such as n-acyi amino acid derivatives. Formation of such an antiperspirant stick with such a dual gellant system has been characterized as a "gel-solid" antiperspirant stick.

An antiperspirant gel-solid, such as that described by Hofrichter et. al.. is an antiperspirant stick having a three-dimensional. non-polymeric, gel network in which solvent is contained or trapped. These gel-solids are typically formed by solubilizing the gellant in the solvent at temperatures above the melt point of the gellant and at temperatures at which the melted gellant is soluble in the solvent, and then cooling the composition to form the desired gel-solid composition. The low residue gel-solids described by Hofrichter et al. are remarkably stable, both physically and chemically, and will maintain the desired product hardness over an extended period of time. The gel-solids described by Hofrichter et al.. however.

are limited to select dual gellant systems and do not include or otherwise describe any method of making a low-residue antiperspirant gel-solid stick containing any other gellant or gellant system.

It has now been found that other methods can be used for making low-residue gel-solids without reliance .upon the use of the select combinations'of gellants described by Hofrichter et al. The new method pertains to the formulation of an anhydrous system which comprises from about 0.5% to about 60% by weight of paniculate antiperspirant active: from about 1% to about 15% by weight of a solid nonpolymeric gellant that is substantially free of organic polymeric gellants, inorganic thickening agents, dibenzylidene alditol, or n-acyl amino acid derivatives: from about 10% to about 80% by weight of an anhydrous liquid carrier for the solid non-polymeric gellant having an average solubility parameter ((cal/cm3) 0 of from about 3 about 13: wherein the composition has a.visible residue index of from o" about II to about 30 L-value. a product hardness of from about 500 gram-force to about 5.000 gram-force.

a ratio of an elastic modulus to a viscous modulus of from about 0.1 to about 100. The method described herein does not require refractive index matching of the particulate antiperspirant active, the solid non-polymeric gellant, and the anhydrous liquid carrier to obtain low residue performance. The methods preferably result in compositions which comprise gellant crystalline particles having an average particle size of less than about 1 pm. and/or an elongated panicle morphology defined by an aspect ratio of grcatr than about 2.

It is therefore anaspect: of the present invention to provide a method for making an anhydrous antiperspirant gel-solid stick containing particulate antiperspirant active which provides improved low residue performance and improved antiperspirant efficacy, and further to provide such a method which does not rely upon the use of specific gellants such as dibenzylidene. alditols or dual gellant systems containing n-acyl amino acid derivatives. It is a further aspect of the present invention to provide such a method composition without reliance upon refractive index matching of component materials, or the use of solubilized antiperspirant active, to obtain product clarity or low residue performance. It is yet another aspect-of-the-present-invention to provide such a method wherein gellant crystalline size and morphology are controlled to achieve improved low residue performance, efficacy and aesthetics.

3a The discussion of documents, acts, materials, devices, articles and the like is included in this specification solely for the purpose of providing a context for the present invention. It is not suggested or represented that any or all of these matters formed part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed in Australia before the priority date of each claim of this application.

i 9 *o*o Document4 -4- SUMMARY OF THE INVENTION The present invention is directed to a method for making an anhydrous antiperspirant gel-solid stick composition, which method comprises the steps of: combining the following components: from about 0.5% to about 60% by weight of paniculate antiperspirant active; (ii) from about 1% to about 15% by weight of a solid non-polymeric gellant that is substantially free of organic polymeric gellants, inorganic thickening agents, dibenzylidene alditol, n-acyl amino acid derivatives or combinations thereof; and (iii) from about 10% to about 80% by weight of an anhydrous liquid carrier having an average solubility parameter of from about 3 to about 13 [cal/cm 3 5 and liquefying the solid non-polymeric gellant; and then solidifying the liquefied gellant in the presence of the anhydrous liquid carrier and paniculate antiperspirant active to form an antiperspirant gel-solid composition having a visible residue index of from about I to about 30 L-value, a product hardness of from about 500 gram-force to about 5,000 gram-force, and a ratio of an elastic modulus to a viscous modulus of from about 0.1 to about 100, wherein the refractive indices of the particulate antiperspirant active, the solid non-polymeric gellant, and the anhydrous liquid carrier are not matched.

It has been found that antiperspirant gel-solid stick compositions, when made in accordance with *:the methods of the present invention, can provide low residue performance without the need to use solubilized antiperspirant active, and without reliance upon select low residue gellants such as dibenzylidene alditols or select gellant combinations containing n-acyl amino acid derivatives. This is accomplished by formulating an anhydrous gel-solid stick composition having the select hardness and rheology profile preferably provided by a non-polymeric, three-dimensional crystalline gel network made up of small, elongated crystalline panicles having an average panicle size of less than about I ipm and/or a panicle morphology defined by an aspect ratio of at least about 2.

DETAILED DESCRIPTION OF THE INVENTION The methods of the present invention are directed to the formulation of antiperspirant gel-solid stick compositions which are anhydrous systems that are dispersions of particulate antiperspirant active held or contained within a non-polymeric crystalline gel-solid matrix.

The term "anhydrous" as used herein refers to the antiperspirant gel-solid stick compositions made in accordance with the methods herein, and also refers to the essential or optional components of such compositions other than the paniculate antiperspirant active, are substantially free of added or free water.

From a formulation standpoint, this means that the antiperspirant gel-solid stick compositions preferably contain less than about preferably less than about more preferably less than about most preferably zero percent, by weight of free or added water, other than the water of hydration typically associated with the particulate antiperspirant active prior to formulation.

The term "low residue" as used herein refers generally to the visible residue left on the applied areas of the skin during or immediately after application, and more specifically refers to the visible residue index of the composition as defined by the methodology described hereinafter.

The term "ambient conditions" as used herein refers to surrounding conditions under about one atmosphere of pressure, at about 50% relative humidity, and at about 25*C, unless otherwise specified.

The term "substantially free" as used herein, unless otherwise specified, refers to preferred negative limitations of the methods of the present invention, and are directed to the amount or concentration of inorganic thickening agents, organic polymeric thickening agents, dibenzylidene alditol gellants. n-acyl amino acid derivatives, or combinations thereof, resulting in the compositions herein. The term "substantially free" means that the compositions herein preferably contain less than an effective amount of such agents when used alone to provide any thickening or measurable viscosity increase to the composition. In this context, the negative limitations pertain only to those thickening or gelling agents which are also solid under ambient conditions, and which are not silicone containing materials or polymeric derivatives of 12-hydroxystearic acid. Generally, the compositions preferably contain less than preferably less than more preferably less than even more preferably less than most preferably zero percent, of such agents by weight of the composition. Examples of inorganic thickening agents to which the above-described negative limitations pertain include finely divided or colloidal silicas.

fumed silicas, and silicates, which includes montmorillonite clays and hydrophobically treated montmorillonites. bentonites, hectorites and colloidal magnesium silicates. Examples of organic polymeric gelling agents to which the above-described negative limitations pertain include organic polymers well known in the antiperspirant or personal care an for use in providing gelling or thickening or other physical or aesthetic benefits to a composition, specific examples of which include hydrogenated butylene/ethylene/styrene copolymer, polyethylene, oxidized polyethylene, polyamides, acrylic acid a polymers, ethylene acrylate copolymers, and other organic polymeric gelling agents described in Rheological Properties of Cosmetics and Toiletries, Edited by Dennis Laba, published by Marcel Dekker.

In., New York (1993), which description is incorporated herein by reference.

The term "substituted" as used herein, unless otherwise specified, refers to chemical moieties or substituents known or otherwise suitable for attachment to the compounds or other chemical materials described or referred to herein. These substituents include, but are not limited to, those listed and described in C. Hansch and A. Leo, Substituent Constants for Correlation Analysis in Chemistry and Biology (1979), which listing and description are incorporated herein by reference. Examples of such substituents include, but are not limited to, alkyl, alkenyl, alkoxy, hydroxy, oxo, nitro, amino, aminoalkyl aminomethyl, etc.), cyano, halo chlorine, fluorine, bromine, iodine), carboxy, alkoxyaceyl carboethoxy. etc.), thiol. aryl. cycloalkyl, heteroaryl, heterocycloalkyl piperidinyl, morpholinyl, pyrrolidinyl, etc.), imino, thioxo, hydroxyalkyl. aryloxy, arylalkyl, amides, esters, ethers, combinations thereof, and the like.

The term "n-acyl amino acid derivatives" refers to gellants selected from the group consisting of nacyl amino acid amides, n-acyl amino acid esters prepared from glutamic acid, lysine, glutamine, apanic acid, and combinations thereof, and which are specifically disclosed in U.S. Patent 5.429.816.

The terms "alkyl" and "alkenyl" as used herein, unless otherwise specified, refer to substituted or unsubstituted, branched, cyclic or linear, hydrocarbons having from I to about 22 carbon atoms.

The term "volatile" as used herein refers to materials which have a vapor pressure under ambient conditions of at least about 0.2 mm of Hg. Conversely, the term "non-volatile" as used herein refers to materials which have no measurable vapor pressure or which have a vapor of less than about 0.2 mm of Hg under ambient conditions.

The solid non-polymeric gellant, antiperspirant active and anhydrous liquid carrier components of the gel-solid stick compositions herein are preferably not refractive index matched, and more preferably have at least two of such components with refractive indices (rq) that differ by at least about 0.02. more preferably by at least about 0.04.

The methods of the present invention can comprise, consist of, or consist essentially of the Sessential elements and limitations of the invention described herein, as well as any of the additional or optional ingredients, components, or limitations described herein.

As percentages, pans and ratios are by weight of the total composition herein, unless otherwise •specified. All such weights as they pertain to listed ingredients are based on the specific ingredient level and. therefore, do not include solvents, carriers, by-products, filler or other minor ingredients that may be included in commercially available materials, unless otherwise specified.

Product Characteristics The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention are characterized in terms of product hardness, visible residue index, and a rheology profile defined by a ratio of an elastic to viscous moduli. Each of these characteristics is defined in accordance with the methodologies and other limitations described hereinafter.

a) Hardness The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention have a product hardness of from about 500 gram-force to about 5,000 gram-force, preferabli from'about 750 gram-force to about 2,000 gram-force, more preferably from about 800 gram-force to about _1.,400-gram-force.

The term "product hardness" as used herein is a reflection of how much force is required to move a penetration cone a specified distance and at a controlled rate into an antiperspirant gel-solid stick composition under the following test conditions. Higher values represent harder product, and lower values represent softer product. These values are measured at 27°C, 15% relative humidity, using a TA- XT2 Texture Analyzer, available from Texture Technology Corp., Scarsdale. New York, U.S.A. The product hardness value as used herein represents the amount of force required to move a standard 450 angle penetration cone through the composition for a distance of 10mm at a rate of 2mmisecond. The standard cone is available from Texture Technology Corp.. as part number TA-15, and has a total cone length of about 24.7 mm. angled cone length of about 18.3 mm, a maximum diameter of the angled surface of the cone of about 15.5 mm. The cone is a smooth, stainless steel construction and weighs about 17.8 grams.

b) Residue The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention have a visible residue index of from I to about 30 L-value. preferably from about II to about 25 L-value, more preferably from I I to about 20 L-value. The term "visible residue index" as used herein refers generally to the extent to which the antiperspirant gel-solid stick compositions herein are visibly apparent as a thin topical film after application to the skin, and more specifically refers to visible residue values (expressed as an L-value on the L, a, b color scale) as measured in accordance with the following methodology, performed at 27"C. under atmospheric pressure, and at 15% relative humidity on antiperspirant stick compositions having a product hardness of from about 500 gram-force to about 5.000 gram-force.

A piece of black felt, approximately 10 cm x 30 cm. is attached to a movable horizontal slide which is movably attached or fixed to a larger mechanical unit. An example of a suitable piece of black felt for use herein is Supreme Robe Velour. FN-6554, Color 404L, Style 31854. available from So-Fro Fabrics.

Evendale. Ohio. U.S.A. An example of a suitable mechanical assembly for use herein is the Release and Adhesion Tester, Serial No. A-14934, manufactured by Testing Machines, Inc., Amityville. New York.

or a Velmex Unislide Positioning System, Unislide assembly series (MB6000). available from Velmex, Inc., Bloomfield, New York, U.S.A. An antiperspirant stick composition contained within and partially extending out about 0.5 cm from a conventional package or container is positioned perpendicular to and above the attached piece of felt, such that the product extending out of the package or container is facing the piece of felt and the surrounding package is positioned away from the piece of felt. The surrounding package is positioned in place using a mechanical arm or other device suitable for applying the requisite movement to the product as described herein.

The antiperspirant gel-solid stick composition is then slowly moved toward and allowed to gently contact the attached piece of black felt. A 1,000 gram weight is placed on the product sample so that the product continuously contacts the piece of black felt during testing. The weighted sample is then moved repeatedly back and forth across the piece of felt at a fixed speed (about 3 cm/second), and with a fixed amount of applied pressure provided by the weighted product, until the about 1.75 grams of the antiperspirant stick composition is evenly applied over a 5 cm x 20 cm area of the piece of black felt. The piece of felt is then carefully removed from the apparatus.

A calibrated Minolta CR-300 chromameter (available from Minolta Corp., Ramsey, New Jersey, is then used to measure the L-value (on the L,a,b color scale) of the applied surface area. First, a template is placed on top of the piece of felt to facilitate the Minolta readings. Template dimensions are cm x 20 cm. The template has twelve circular openings (2.2 cm diameter) positioned within the template, each opening positioned centrally within adjacent 6.5 cm 2 areas of the template surface. The template is positioned over the applied surface area of the piece of felt such that each of the twelve circular openings covers a non-overlapping area of the applied surface. The chromameter's view port is fined into each of the circular openings and L-value measurements taken. An average L-value is then determined for the twelve measurements (standard deviation of less than about 0.8) which then corresponds to the visible residue index as described herein.

It has been found that there is a correlation between the visible residue index range defined herein and the average panicle size of the crystalline gellant particles in the antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention. Generally. as the average particle size of crystalline gellant particles in the composition decreases, low residue performance improves. In particular, it has been found that a visible residue index of from about i I to about 30 L-value correlates with an average crystalline gellant panicle size of less than about I pm, and/or a crystalline gellant particle morphology characterized by one dimensional crystalline growth such as that resulting in crystalline filaments, fibers, strings or other elongated particles, wherein the aspect ratio as defined by the major and minor axis of the cryitalline particle is greater than about 2, preferably greater than about 6.

o Conversely, solid compositions containing crystalline gellant panicles greater than I pm (average panicle diameter) have a visible residue index of greater than 30 L-value. In view of this correlation between visible residue index values and average crystalline panicle size or elongated panicle morphology, the visible residue index measurement can now be used as an alternative means for establishing average crystalline gellant panicle size or crystalline gellant morphology, at least to the extent that such average panicle size is less than about I pm.

c) Rheologv The antiperspirant stick compositions made in accordance with the methods of the present invehtion are gel-solids having the select rheology profile defined herein. This rheology profile is defined herein in terms of the elastic to viscous moduli ratio G' G" of the gel-solid stick composition.

To provide the requisite rheology, the gel-solid stick compositions must have a G' G" ratio of from about 0.1 to about 100, preferably from about 0. to about 50. more preferably from about I to about 20, even more preferably from about 5 to about 20. This ratio represents the extent to which the gel-solid stick compositions herein exhibit solid character and the extent to which the compositions exhibit liquid or fluid character, and specifically refers to the numerical ratio G' G" as determined by the following methodology.

The elastic modulus is a measurement which correlates with the solid character of the gel-solid stick compositions herein, and the viscous modulus is a measurement which correlates with the fluid or liquid character of the gel-solid stick compositions herein. Measurements for G' and G" for purposes of defining the composition of the present invention are determined under ambient conditions using conventional techniques well known in the formulation arts. For example, a Bohlin Stress-Strain Rheometer, available from Bohlin Reologi. Cranberry. New Jersey, can be used using a cone (about 1°) and plate configuration. About 1.0 mg of the product is carefully removed for the composition with minimal application of shear force and is then placed between the cone and plate fixtures for measurement of G' and G".

It has been found that the gel-solid stick compositions made in accordance with the methods of the present invention exhibit improved low residue performance when formulated as described herein, wherein the composition has the select ratio described hereinabove, especially when the defined rheology is associated with a crystalline gel matrix having a preferred small panicle size and/or panicle morphology as described herein. These gel-solid stick formulations spread smoothly over the skin. and shear quickly and melt during such spreading to form a thin. low residue film over the applied surface.

In particular, it has been found that the gel-solid stick compositions made in accordance with the methods of the present invention have rheology characteristics that result in improved performance, especially low residue performance. These select gel-solid compositions as defined herein behave as solids prior to application while maintained within a canister or other package, but behave more as liquids or fluids during or immediately after application to the skin. In other words, the solid compositions shear thin during application to the skin, melt or almost melt (except for paniculate active which remains unmelted) during the shear thinning application, thus resulting in a thin. low residue, liquid or fluid film on the skin during or immediately after topical application to the skin. The applied film is clear or has very low visible residue, and remains substantially as such over extended periods of time after application.

Antiperspirant Active The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention comprise particulate antiperspirant active suitable for application to human skin. These paniculate actives must remain substantially unsolubilized as dispersed or precipitated solids in the anhydrous or substantially anhydrous systems as described herein. The concentration of particulate active in the composition should be sufficient to provide the desired perspiration wetness and odor control from the antiperspirant gel-solid stick formulation selected.

The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention preferably comprise paniculate antiperspirant active at concentrations of from about to about 60%. more preferably from about 5% to about 35%. by weight of the composition. These weight percentages are calculated on an anhydrous metal salt basis exclusive of water and any complexing agents such as glycine, glycine salts, or other complexing agents. The particulate antiperspirant active as formulated in the composition are in the form of dispersed solid panicles having a preferred average panicle size or diameter of less than about 100 rpm. more preferably from about 15 pm to about 100 pm.

even more preferably from about 20 pm to about 100 jim. Also preferred are dispersed solid particulates having an average particle size or diameter of less than about 2 pm. even more preferably from less than about 0.4 pm. It has been found that antiperspirant active panicles within the preferred panicle size ranges provide lower visible residue performance from the gel-solid compositions herein than other less preferred panicle size ranges.

The antiperspirant active for use in the antiperspirant gel-solid stick compositions herein include any compound, composition or other material having antiperspirant activity. Preferred antiperspirant actives include the astringent metallic salts, especially the inorganic and organic salts of aluminum.

zirconium and zinc, as well as mixtures thereof. Particularly preferred are the aluminum and zirconium salts, such as aluminum halides. aluminum chlorohydrate. aluminum hydroxyhalides. zirconyl oxyhalides.

zirconyl hydroxyhalides, and mixtures thereof Preferred aluminum salts for use herein include those which conform to the formula: AIl(OH)a Cl b x H-, wherein a is from about 2 to about 5; the sum of a and b is about 6; x is from about I to about 6. and wherein a, b, and x may have non-integer values. Particularly preferred are the aluminum chlorhydroxides referred to as "5/6 basic chlorhydroxide", wherein a 5, and "2/3 basic chlorhydroxide". wherein a 4.

Processes for preparing aluminum salts are disclosed in U.S. Patent 3,887.692. Gilman. issued June 3.

1975; U.S. Patent 3.904,741, Jones et al.. issued September 9, 1975; U.S. Patent 4.359.456, Gosling et al., issued November 16, 1982; and British Patent Specification 2.048,229, Fitzgerald et al., published December 10, 1980, all of which are incorporated herein by reference. Mixtures of aluminum salts are described in British Patent Specification 1,347,950, Shin et al., published February 27, 1974, which description is also incorporated herein by reference.

Preferred zirconium salts for use herein include those which conform to the formula: ZrO(OH)2.aCla x H 2 0 wherein a is from about 1.5 to about 1.87; x is from about I to about 7; and wherein a and x may both have non-integer values. These zirconium salts are described in Belgian Patent 825,146, Schmitz, issued August 4, 1975, which description is incorporated herein by reference. Particularly preferred zirconium salts are II those complexes which additionally contain aluminum and glycine, commonly known as ZAG complexes.

These ZAG complexes contain aluminum chlorhydroxide and zirconyl hydroxy chloride conforming to the above described formulas. Such ZAG complexes are described in U.S. Patent 3,679,068, Luedders et al., issued February 12, 1974; Great Britain Patent Application 2,144,992, Callaghan et al., published March 1985: and U.S. Patent 4.120,948, Shelton, issued October 17, 1978, all of which are incorporated herein by reference.

The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention can also be formulated to comprise other dispersed solids or other materials in addition to or in place of the particulate antiperspirant active. Such other dispersed solids or other materials include any material known or otherwise suitable for topical application to human skin. The antiperspirant gel-solid stick compositions can also be formulated as gel-solid stick compositions which contain no antiperspirant or other active material, particulate or otherwise.

Gellant The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention comprise a solid non-polymeric gellant suitable for topical application to human skin, other than inorganic thickening agents, organic polymeric gellants or other gellants such as dibenzylidene alditol and n-acyl amino acid derivatives. These solid non-polymeric gellants must form within the composition a crystalline matrix within which an anhydrous liquid carrier or other liquid component of the composition is trapped or contained. These solid non-polymeric gellants preferably form crystalline particles having an average particle diameter and particle morphology as described hereinafter.

The antiperspirant gel-solid stick compositions are substantially free of inorganic thickening agents.

organic polymeric thickening agents, and gellants selected from the group consisting of dibenzylidene alditols, and n-acyl amino acid derivatives. In this context, "substantially free" means that the compositions contain less than an effective amount of such agents that when used alone would provide any thickening or measurable viscosity increase to the composition under ambient conditions. Generally. the compositions preferably contain less than more preferably less than even more preferably less than most preferably zero percent, of such agents by weight of the composition.

The antiperspirant gel-solid compositions are preferably substantially free of fatty alcohols that are solids under ambient conditions and which contain from 12 to 40 carbon atoms. More specifically, the compositions herein preferably contain no more than about preferably from zero to about by weight of such fatty alcohol materials. Minimal concentrations of such materials may be used, however.

in the composition as a nucleating agent as described hereinafter.

The concentration of the gellants in the compositions may vary with each selected antiperspirant -gel-solid stick-fo-inulatioii7-speciall-with each selected anhydrous liquid carrier of the formulation, but such concentrations will generally range from about 0.1% to about 20%, preferably from about 1% to 12 about 15%, more preferably from about 3% to about 12%, by weight of the composition. The nonpolymeric gellants must be solids under ambient conditions.

The solid non-polymeric gellants for use in the antiperspirant gel-solid stick compositions are those which can melt and form a solution or other homogenous liquid or liquid dispersion with the selected anhydrous liquid carrier, and at the selected gellant and liquid carrier concentrations, at a processing temperature of from about 28 0 C to about 250°C, preferably from about 28 0 C to about 100 0 C, more preferably from about 28 0 C to about 78*C. The melted non-polymeric gellant is typically dissolved by or dispersed throughout the selected liquid carrier to thus form a solution or other homogenous liquid. The solution or other homogenous liquid, and other essential and optional ingredients, are preferably combined in accordance with the manufacturing method described herein or other conventional or otherwise known technique, and then placed in a suitable package as a flowable solution or homogenous liquid, and then allowed to solidify and form the desired solid gel matrix within the composition as the temperature returns to ambient temperature and drops to below the solidification point of the composition.

In selecting a combination of solid non-polymeric gellant and liquid carrier for use in the antiperspirant gel-solid stick compositions, the selected combination should allow for the development of a crystalline gellant matrix within the composition wherein the component crystalline panicles preferably *have an average panicle size of less than about 1 pm, more preferably less than about 0.4 pm. even more preferably less than about 0.2 pm, most preferably from about 0.001 pm to about 0.2 pm, and/or wherein "the crystalline panicles have the requisite elongated morphology described herein, wherein panicle size is measured or determined by the methods described herein or by methods well-known to those skilled in the an such as light or electron microscopy. The gel-solid stick compositions can be prepared by methods well known in the formulation art for making gel-solids having minimal crystalline panicle size or the preferred elongated particle morphology. The gel-solid stick compositions are preferably prepared by the select methods described hereinafter directed to minimizing crystalline panicle size and/or establishing the preferred crystalline particle morphology.

Solid non-polymeric gellants suitable for use in the antiperspirant gel-solid stick compositions include fatty acid gellants, esters and amides of fatty acid gellants, hydroxy acids, hydroxy fatty acids.

cholesterolic materials, lanolinolic materials, and other amide gellants known for use as gelling agents or which are otherwise described in detail hereinafter. Other crystalline gellants can be used in the gel-solid stick compositions of the present invention provided that such other gellants can be formulated to provide the requisite crystalline gel matrix and product and rheology characteristics defined herein.

Other solid non-polymeric gellants suitable for use in the antiperspirant gel-solid stick compositions herein include fatty acid gellants which include, but are not limited to, fatty acid and hydroxy or alpha hydroxy fatty acids, having from about 10 to about 40 carbon atoms, examples of which include 12-hydroxystearic acid, 12-hydroxylauric acid, 16-hydroxyhexadecanoic acid, behenic acid, eurcic acid, 13stearic acid. caprylic acid, lauric acid, isostearic acid, and combinations thereof. Preferred fatty acid 2ellants are those having the fatty acid dimer to monomer ratio as described hereinafter.

Preferred solid non-polymeric gellants suitable for use in the antiperspirant gel-solid stick compositions include 12-hydroxystearic acid, esters of 12-hydroxystearic acid, amides of 12hydroxystearic acid and combinations thereof. These preferred gellants include those which correspond to the following formula: 0

H

I1 R,-C CH 2

C-CH

2

CH

3

OH

wherein R I is OR 2 or NR2R 3 and R 2 and R 3 are hydrogen, or an alkyl, aryl, or arylalkyl radical which is branched linear or cyclic and has from about I to about 22 carbon atoms; preferably, from about I to about 18 carbon atoms. R 2 and R 3 may be either the same or different: however, at least one is preferably a hydrogen atom. Preferred among these gellants are those selected from the group consisting of 12hydroxystearic acid. 12-hydroxystearic acid methyl ester, 12-hydroxystearic acid ethyl ester. 12hydroxystearic acid stearyl ester. 12-hydroxystearic acid benzyl ester. 12-hydroxystearic acid amide, isopropyl amide of 12-hydroxystearic acid, butyl amide of 12-hydroxystearic acid, benzyl amide of 12hydroxystearic acid. phenyl amide of 12-hydroxystearic acid. t-buryl amide of 12-hydroxystearic acid.

cyclohexyl amide of 12-hydroxystearic acid. I-adamantyl amide of 12-hydroxystearic acid. 2-adamanryl amide of 12-hydroxystearic acid, diisopropyl amide of 12-hydroxystearic acid. and mixtures thereof: even more preferably, 12-hydroxystearic acid. isopropyl amide of 12-hydroxystearic acid, and combinations thereof. Most preferred is 12-hydroxystearic acid.

Suitable amide gellants include disubstituted or branched monoamide gellants. monosubstituted or branched diamide gellants, triamide gellants, and combinations thereof, excluding the n-acyl amino acid derivatives selected from the group consisting of n-acyl amino acid amides, n-acyl amino acid esters prepared from glutamic acid, lysine, glutamine, aparic acid, and combinations thereof, and which are specifically disclosed in U.S. Patent 5,429,816.

Preferred amide gellants for use herein include alkyl amides of di- and/or tri-basic carboxylic acids or anhydrides, concentrations of which are preferably from about 0.1% to about 25%, preferably of from about 1% to about 15%, more preferably from about 1% to about 10%, by weight of the composition.

Alkyl amides suitable for use in the antiperspirant gel-solid stick compositions herein include those which conform to the formula: -14 R 9 0 R.i R C -N -R, at R7 R 3-X -Y -Z -R 8 3

RR

wherein a backbone is formed from the linkag~e of C" and X and wherein a) R 1 is nil. hydroxy. hydrogen. aryl. siloxane or saturated or unsaturated, substituted or unsubstitute d, straight. branched or cyclic chain C 1 alkyl. alkenyl. C 1 2 alkoxy. C 1 alkyl esters. C 1 alkyl ethers. or C 1 alkyl substituted aryl. preferably C 4 -Cl 8 alkyl. C 4

-C

1 8 alkenyl, C 4

-C

18 alkoxy. C 4

-C

18 alkyl esters. C 4

.CI

8 alkyl ethers, or C 4

-C

18 alkyl substituted aryl. more preferably C 1 2-CIS alkyl. C 1

-CI

8 alkenyl. C 1 2-C 18 alkoxy, C 1 2,.C 18 alkyl esters, C 1 2--C 18 alkyl ethers, or C I 2-C 18 alkyl substituted aryl.

b) R 4

R

5 and R, 6 are independently or together. hydrogen. hydroxy. aryl. siloxane or saturated or *unsaturated, substituted or unsubstituted. straight, branched or cyclic chain C I-C-v, alkyl, C alkenyl. C 1 alkoxy. C 1 alkyl esters, C 1 alkyl ethers, or C 1 alkyl substituted aryl. preferably C 4 -C 10 alkyl, C 4 -C 10 alkenyl. C 4 -C 10 alkoxy, C 4 -C 10 alkyl esters. C 4 -C 10 alkyl o ethers. or C 4

-C

10 alkyl substituted aryl. more preferably C 4

-C

8 alkyl. C 4

-C

8 alkenyl, C 4

.C

8 0.0 alkoxy, C 4 -Cg alkyl esters. C 4 -Cg alkyl ethers, or C 4 -C8 alkyl substituted aryl; C) R 3 is nil, hydroxy, hydrogen. saturated or unsaturated. substituted or unsubstituted. straight.

eeooo: ~~branched or cyclic chain C 1

-C

4 alkyl. C I-C 4 alkenyl. C I-C 4 alkoxy, C I-C 4 alkyl esters orCI-4 *..000alkyl ethers, preferably a C 1

-C

4 alkoxy, hydroxy or hydrogen. more preferably a hydroxy or hydrogen; 0 0 d) R 7 and R8 are independently or together, nil, hydrogen. hydroxy. aryl, siloxane or saturated or .000 unsaturated, substituted or unsubstituted. straight, branched or cyclic chain C I alkyl. C *alkenyl, C 1

-C

22 alkoxy, C 1 alkyl esters, alkyl ethers, or C 1 alkyl substituted aryl, preferably C 4 -C 10 alkyl, C 4 -C 10 alkenyl. C 4 -C 10 alkoxy, C 4 -C 10 alkyl esters. C 4 -C 10 alkyl ethers, or C 4

-CI

0 alkyl substituted aryl, more preferably C 4

-C

8 alkyl, C 4

-C

8 alkenyl. C 4 -Cg alkoxy, C 4

-C

8 alkyl esters, C 4

-C

8 alkyl ethers, or C 4

-C

8 alkyl substituted aryl; e) R 9 is nil or hydrogen; f) RIO and R, I are independently or together, nil, hydrogen, hydroxy, aryl, siloxane or saturated or unsaturated, substituted or unsubstituted. straight, branched or cyclic chain C 1

-C

6 alkyl, CI-C 6 alkenyl, C -C 6 alkoxy, C -C 6 alkyl esters, C -C 6 alkyl ethers. or C -C 6 alkyl substituted aryl.

preferably C -C 4 alkyl, C 1 I -C 4 alkenyl, CI -C 4 alkoxy, C I-C 4 alkyl esters, C I-C 4 alkyl ethers, C 1

C

4 alkyl substituted aryl or hydrogen, more preferably a hydrogen; 15 g) X is nil. nitrogen, aryl or n where n is an integer from I to 6, preferably "(fCHn where n is an integer from I to 3; h) Y is nil, acyl or carbonyl; i) Z is nil, hydrogen, hydroxy, aryl, siloxane, nitrogen or saturated or unsaturated, substituted or unsubstituted, straight, branched or cyclic chain Cl-C-2 alkyl, CI-C-2 alkenyl. CI-C22 alkoxy.

CI-C

22 alkyl esters, Cl-C 2 2 alkyi ethers, or CI-C22 alkyl substituted aryl, preferably C 4

-C

10 alkyl. C 4

-C

10 alkenyl. C 4

-C

1 0 alkoxy, C 4

-C

10 alkyl esters, C 4

.C

10 alkyl ethers, or C 4

-C

10 alkyl substituted aryl. more preferably C 4

-C

8 alkyl. C 4

-C

8 alkenyl, C 4 -Cg alkoxy, C 4

-C

8 alkyl esters,

C

4

-C

8 alkyl ethers, or C 4

-C

8 alkyl substituted aryl; and j) is a double or single bond provided: when X is nil, Y, Z, R 3

R

7 and Rg are nil. C' is bonded directly to C" and R is not a hydrogen; (ii) when X and Z are not nil and Y is nil. X is directly bonded to Z; (iii) when Z is nil, a hydrogen or a hydroxy, R 7 and Rg are nil; and (iv) when is a double bond, R 3 and R 9 are nil.

Alkyl amides of di- and tri-basic carboxylic acids or anhydrides suitable for use in the antiperspirant gel-solid stick composition include alkyl amides of citric acid. tricarballylic acid, aconitic acid. nitrilotriacetic acid, succinic acid and itaconic acid such as 1.2.3-propane tributylamide. 2-hydroxy- 1.2.3-propane tributylamide, I-propene-l.2.3-trioctylamide. N,N'.N"-tri(acetodecylamide)amine, 2dodecyl-N,N'-dihexylsuccinamide, and 2 dodecyl-N.N'-dibutylsuccinamide. Preferred are alkyl amides of di-carboxylic acids such as di-amides of alkyl succinic acids, alkenyl succinic acids, alkyl succinic anhydrides and alkenyl succinic anhydrides, more preferably 2-dodecyl-N.N'-dibutylsuccinamide.

S The alkyl amide gelling agents, preferably, have opposing and substantially parallel terminal chains extending outward from the gelling agent backbone. It is believed that this spacial arrangement, or "tuning fork" structural configuration, facilitates the formation of networks essential to the formulation of gel or gel-solid stick compositions. By the phrase "tuning fork configuration", as used herein means any configuration resembling an article or implement having a handle portion which extends longitudinally at one end to form two prongs. It is also preferred that the terminal chains be linked to the gelling agent backbone by means of acyl-amide linkages wherein the acyl portion of the acyl-amide linkage is directly attached to the gelling agent backbone.

The alkyl amides gellants may be synthesized using either of the following one or two step reaction procedures. The one step procedure involves direct amidation of the di- or tri-basic organic acid or anhydride with the appropriate alkyl amine under reaction temperatures typically at or near the boiling point of the alkyl amine, preferably from about 30*C to about 200*C, followed by removal of excess amine. Certain reactions, do to their exothermic nature, may not require external heating.

The alkyl amides gellants may also be synthesized using a two step procedure which involves esterification of the di- or tri-basic organic acid or anhydride with methanol using a boron trifluoride or other Lewis Acid catalyst at a temperature of from about 30*C to about 100°C followed by removal of the excess methanol and catalyst. The resulting trimethyl ester is then amidated as described in the one step process above using the appropriate alkylamine followed by removal of excess amine. The alkyl amides are preferably non-polymeric.

These solid non-polymeric gellants described herein are especially effective when used in combination with select anhydrous carriers such as volatile silicones, especially volatile cyclomethicone.

These gellants are most preferably used in combination with a liquid carrier comprising a volatile silicone and a non-volatile silicone non-volatile dimethicones or other organofunctional siloxanes well known in the art) and/or a non-volatile organic carrier.

Preferred enantomeric Rellants Preferred solid non-polymeric gellants for use herein include those enantomeric compounds or materials containing at least one asymmetric (chiral) carbon atom. Non-limiting examples of these

S

preferred enantomeric gellants include 12-hydroxystearic acid. other hydroxy acids such as alpha hydroxy acids, cholesterols. lanolin, and derivatives thereof.

It has been found that these preferred enantomeric gellants, when used in the anhydrous antiperspirant gel-solid stick compositions herein, provide the composition with the requisite product 00* hardness, visible residue index values and rheological properties It is believed that these enantomeric gellants are especially effective in forming one-dimensional elongated panicles in the form of filaments, fibrils or strings which are intertwined or twisted to form a stable, three-dimensional crystalline matrix in the gel-solid composition. These elongated panicles have an aspect ratio of greater than about 2.

preferably greater than about 6. It is believed that these gellants form elongated crystalline panicles that result in a stable crystalline matrix that in pan because of the small size and elongated morphology of these particles, cause less scattering of light when applied to the skin in the antiperspirant composition.

which then results in low visible residue after such application.

S

Preferred panicle morphology The solid non-polymeric gellants for use herein include those crystalline gellants that inherently form, or can be formulated or otherwise made to form, elongated crystalline particles having an aspect ratio greater than about 2, preferably greater than about 6. These elongated crystals preferably have an average particle size as measured along a minor axis of the elongated crystal of less than 1 more preferably less than about 0.4 pm, even more preferably less than about 0.2 gm, most preferably from about 0.2 pm to about 0.001 pm.

-17- The "aspect ratio" as used herein to define preferred embodiments of the gel-solid stick compositions herein can be determined by measuring or otherwise determining the ratio of the length of the major axis of the crystalline particles to the length of the minor axis of the crystalline panicles. This length ratio of the major to minor axis is characterized as the aspect ratio referred to herein. The aspect ratio can be determined by conventional or otherwise known light or electron microscopy methods, wherein the crystalline panicles are measured for major and minor axis dimensions, or are otherwise observed by such methods to clearly have an apparent elongated crystalline structure with an aspect ratio substantially greater than about 2, preferably greater than about 6.

It has been found that these crystalline gellants having the select aspect ratios defined herein.

provide the antiperspirant gel-solid stick compositions a three-dimensional crystalline structure that can provide the composition with the requisite low residue performance, elastic to viscous moduli ratio, and product hardness as defined herein. It is believed that this crystalline morphology is especially effective in providing a crystalline matrix within the composition that provides for a strong interlocking gel-solid matrix network, but which also comprises crystalline panicles that are sufficiently small in size so as to contribute minimally to visible residue when applied topically to the skin.

e* It has also been found that the preferred crystalline matrix helps provide the gel-solid stick compositions with a melt profile that contributes to low residue performance. This preferred melt profile refers to the temperature at which the antiperspirant gel-solid stick composition begins to melt, and the temperature range within which the composition is completely melted, except for any dispersed antiperspirant paniculates or other high melting point components. The temperature at which the composition begins to melt is determined by measuring a Differential Scanning Calorimeter (DSC) onset temperature. The temperature range within which the composition is completely melted is determined by no additional heat infusion. Preferred embodiments of the gel-solid stick compositions herein have a DSC onset temperature of from about 25°C to about 85°C, preferably from about 27*C to about 65°C, more preferably from about 30*C to about 60*C. even more preferably from about 35*C to about 50*C. These preferred compositions having the select melt profile provide improved cosmetics or aesthetics when applied topically to the skin. and especially provide reduced feeling of wetness, stickiness or product softness during and immediately after application. The select melt profile also helps to further reduce the °visible residue index of the composition, thus further improving lower residue performance.

Preferred dimer to monomer ratio The solid non-polymeric gellant of the antiperspirant gel-solid stick compositions herein, made in accordance with the methods herein, preferably comprise a fatty acid gellant having a select dimer-tomonomer ratio. Thefatty-cid gellants having the requisite-dimer-to-monomer ratio may be used alone or in combination with an additional or secondary gellant in the composition. The select dimer-to-monomer ratio helps provide the gel-solid stick compositions herein with improved low residue performance.

18efficacy and aesthetics, and especially provides for improved low residue performance and improved product hardness.

The fatty acid gellants in the antiperspirant gel-solid stick composition, when used in combination with an additional or secondary gellant. has a select dimer-to-monomer ratio of from about 1:1 to about 25:1, preferably from about 1.5:1 to about 25:1. more preferably from about 2.5:1 to about 20:1, even more preferably from about 3:1 to about 10:1. The higher dimer-to-monomer ratios are preferred.

The dimer-to-monomer ratio of the fatty acid gellant can be determined by methods or techniques known in the formulation arts, including infrared methods such as Fourier Transform Infared (FTIR) Spectroscopy. Such methods are disclosed in The Infared Spectra of Complex Molecules. L.J.

Bellamy. 2nd Edition, 1958, Introduction to Infared and Roman Spectroscopy, N.B. Colthup, et. al.. 3rd Edition. 1990, and Fourier Transform InfarcdSpectroscop.y P.R. Griffiths, et.al.. 1986, all disclosures of which are incorporated by reference herein. In accordance with such methods or techniques. fatty acids are usually characterized by their carbonyl stretching frequencies which are measured as absorption bands between 1740 cm-1 and 1680 The fatty acid gellant of the antiperspirant composition of the present invention comprises fany acid dimers and fatty acid monomers which are components of the carbonyl absorption band. However, due to the formation of hydrogen bonded dimers, the fatty acid dimer component can be shifted as far as 30 cm- 1 frequencies lower than the fatty acid monomer Sfrequency.

By use of infrared spectra data, the dimer-to-monomer ratio is determined by calculating the ratio of the peak area of the hydrogen bonded dimer second derivative band near 1696 cm- 1 to the peak area of the fatty acid monomer second derivative band near 1712 cm- 1 In accordance with the following *i methodology, an infrared spectra is recorded using a 45* ZnSc Attenuated Total Reflectance ("ATR" herein) crystal and a horizontal ATR apparatus (available from Spectra Tech. Inc., Shelton, Connecticut.

attached to a Nicolet 20scx FTIR Spectrometer. The Nicolet 20scx FTIR Spectrometer is available from Nicolet Instrument Corporation, Madison. Wisconsin, The Nicolet 205scx FTIR Spectrometer is equipped with a narrow band mercury cadmium Telluride detector whereby an average of 256 scans are co-added to generate the infrared spectra. The infrared spectra is then imported into a computer software program such as GRAMS/386 (available from Galactic Industries Corporation. Salem.

New Hampshire, to calculate the dimer-to-monomer ratio using a 5 point second derivative algorithm which is a mathematical procedure defined by Savitsky-Golay.

The requisite dimer-to-monomer ratio may be established with the fatty acid gellants described herein, which includes alpha-hydroxy fatty acids and fatty acids having from about 10 to about 40 carbon atoms, examples of which include 12-hydroxystearic acid, 12-hydroxylauric acid. 16hydroxyhexadecanoic acid, behenic acid, eurcic acid, stearic acid, caprylic acid, lauric acid, isostearic acid, and combinations thereof. Examples of some suitable fatty acid gellants are described in U.S. Patent 5,429,816, issued to Hofrichter et al. on July 4, 1995; and U.S. Patent 5,552,136, issued to Motley on -19- September 3, 1996. which descriptions are incorporated herein by reference. Most preferred is 12hydroxystearic acid.

The requisite dimer-to-monomer ratio may also be established with the fatty acid gellants described herein in combination with an additional or secondary gellant, wherein the molar ratio of the fany acid gellant to the additional or secondary gellant is from about 1:2 to about 20:1, preferably from about 1:1 to about 10:1, more preferably from about 2:1 to about 7:1, and even more preferably from about 3:1 to about 5:1. One of average skill in the chemical or formulation arts can formulate these fatty acid gellant systems to control or otherwise obtain the described ratio. The additional or secondary gellants suitable for use in formulating the requisite dimer-to-monomer ratio include the solid non-polymeric gellants described herein.

Anhydrous Liquid carrier The anhydrous antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention comprise an anhydrous liquid carrier for the crystalline gellant described hereinbefore. The anhydrous liquid carrier is liquid under ambient conditions, and preferably has a low viscosity to provide for improved spreading on the skin.

i Concentrations of the anhydrous liquid carrier in the gel-solid stick compositions will vary primarily with the type and amount of the anhydrous liquid carrier, the solid non-polymeric gellant. and the solubility of the solid non-polymeric gellant in the anhydrous liquid carrier. Preferred concentrations of the anhydrous liquid carrier are from about 10% to about 800%, preferably from about 30% to about more preferably from about 45% to about 70%. by weight of the composition.

The anhydrous liquid carrier comprises one or more liquid carriers suitable for topical application to human skin. These liquid carriers may be organic, silicone-containing or fluorine-containing, volatile or non-volatile, polar or non-polar, provided that the liquid carrier forms a solution or other homogenous liquid or liquid dispersion with the selected non-polymeric gellant at the selected gellant concentration at a temperature of from about 28°C to about 250*C. preferably from about 28°C to about 100*C. preferably from about 280C to about 78°C.

The anhydrous liquid carrier has a solubility parameter of from about 3 to about 13 (cal/cm 3 0 i preferably from about 5 to about II (cal/cm 3 0 5 more preferably from about 5 to about 9 (cal/cm 3 0 5 Solubility parameters for the liquid carriers or other materials, and means for determining such parameters.

are well known in the chemical arts. A description of solubility parameters and means for determining them are described by C.D. Vaughan, "Solubility Effects in Product, Package, Penetration and Preservation" 103 Cosmetics and Toiletries 47-69, October 1988; and C. D. Vaughan, "Using Solubility Parameters in Cosmetics Formulation", 36 J. Soc. Cosmetic Chemists 319-333,-September/October, 1988.

which descriptions are incorporated herein by reference.

The anhydrous liquid carrier preferably comprises a modified or organofunctional silicone carrier seiected from the group consisting of polyalkylsiloxanes. polyalkyarylsiloxanes, polyestersiloxanes, polyethersiloxane copolymers, polyfluorosiloxanes, polyaminosiloxanes, and combinations thereof. These modified silicone carriers must be liquid under ambient conditions, and have a viscosity of less than about 100.000 centistokes, preferably less than about 500 centistokes, more preferably from about I centistoke to about 50 centistokes, and even more preferably from about I centistoke to about 20 centistokes. These modified silicone carriers are generally known in the chemical arts, some examples of which are described in I Cosmetics. Science and Technology 27-104 Balsam and E. Sagarin ed. 1972); U.S. Patent 4.202.879. issued to Shelton on May 13, 1980; U.S. Patent 5.069,897. issued to Orr on December 3, 1991; which descriptions are incorporated herein by reference.

The modified silicone carriers suitable for use in the antiperspirant gel-solid stick compositions include, but are not limited to. compounds or materials as defined hereinabove and which are generally characterized as follows: silicone polyethers or silicone glycols (such as dimethicone copolyol); silicone alkyl-linked polyethers (such as Goldschmidt EM.90 or EM-97); siloxane surfactants of a pendant/rake/comb configuration, silicone surfactants of a trisiloxane configuration, and silicone surfactants of an ABA/alpha-omega block copolymers (such as polyoxyalkylenes, polyoxyethylene or ethoxylated, polyoxyethylene/polyoxypropylene or ethoxylated/propoxylated); aromatic substituted silicone emollients (such as phenyl, alpha-methyl styryl, styryl, methylphenyl, alkylphenyl); silicone copolymers with other functional groups include: hydrogen, alkyl, methyl, amino, trifluoropropyl, vinyl.

alkoxy, arylalkyl. aryl. phenyl, styryl. polyethers. esters, carboxylics: alkylmethyl siloxanes or silicone waxes (such as hexyl, octyl, lauryl, cetyl. stearyl): nonionic functional siloxane copolymers with terminal groups being silanol or trimethylsiloxy; nonionic functional siioxanes with backbone groups being trisiloxane or methicone linked; nonionic silicone surfactants; tetraethoxysilane; tetramethoxysilane: hexamethoxysilicone; oxmethoxytrisiloxane; silicone emulsifiers; silicone or siloxane resins, alkyl silicone resins, polyoxyalkylene silicone resins: MQ Resins such as Shiseido/Shin-etsu Japanese Patent Publication JP86143760 or from Walker Chem. 6MBH (described in EP722970); alkoxysiloxanes; alkoxysilanes; methicones (polymethylalkylsiloxanes); and combinations thereof.

Nonlimiting examples of suitable modified silicone carriers for use in the antiperspirant gel-solid stick compositions herein include the following modified silicones available from Dow Coming: DC-556 Cosmetic Grade Fluid (phenyl trimethicone); DC-704 Diffusion Pump Fluid (Tetramethyl-Tetraphenyl- Trisiloxane); DC-705 Diffusion Pump Fluid; DC-1784 Emulsion; DC-AF Emulsion; DC-1520-US Emulsion; DC-593 Fluid (Dimethicone [and] Trimethylsiloxysilicate); DC-3225C Fluid (Cyclomethicone [and] Dimethicone Copolyol); DC-190 Fluid (Dimethicone Copolyol); DC-193 Fluid (Dimethicone Copolyol); DC-1401 (Cyclomethicone [and] Dimethiconol); DC-5200 Fluid (Laurylmethicone Copolyol); DC-6603 Polymer Powder; DC-5640 Powder; DC-Q2-5220 (Dimethicone Copolyol); DC Q2-5324 (Dimethicone Copolyol); DC-2501 Cosmetic Wax (Dimethicone Copolyol); DC-2502 Fluid (Cetyl -21 Dimethicone), DC-2503 Wax (Stearyl Dimethicone); DC-1731I Volatile Fluid (Caproyl Trimethicone).

DC-580 Wax (Stearo xytrimeth yls ilane [and] Stearyl Alcohol); DC-1-3563 (Dimethiconal); DC-X2-1286 (Dimethiconol); DC-X2-l 146A (Cylcomethicone [and] Dimethiconol); DC-8820 Fluid (Amino functional ized); DC Q5-0l58A wax (stearoxytrimethyIsi lane); DC-Q2-8220 (Trimethylsilylamodimethicone) DC-7224 (Trimethylsilylamodimethicone);, DC-X- 1318 Fluid (Cyclomethicone land] Vinyldimethicone); DC-QFI-3593A fluid (Trimethylsiloxysilicate) and combinations thereof.

Other nonlimiting examples of suitable modified silicone carriers for use in the antiperspirant gelsolid stick compositions herein include the following m~dified silicones available from General Electric: GE SF- 1023 (Dimethyl-Diphenyl-Siloxane); GE CF-I 1142 (Methylphenyl Siloxane Fluid); GE SF-I 1153 (Dimethyl-Diphenyl-Siloxane); GE SF- 1265 (Diphenyl-Dimethyl-Siloxane), GE SF- 1328; GE SF- 1188 (Dimethicone copolyol); GE SF-I 188A (Silicone polyether copolymer): GE SF-1288 (silicone polvether copolymer. dimethyl-methyl 3-hydroxypropyi ethoxylated); GE SF-1318 (Methylester Siloxane): GE SF- 1328 (silicone surfactant, dlimethyl-methyl 3-hydroxypropyl ethoxylated-propoxylated); GE SF- 1550 (methylphenyl siloxane, hexaniethyl-3-phenyl-3-[jtrimethylsilyljoxy]tisiloxate) GE SF- 1632 (silicone wax). GE SS-4267 (Dimethicone landi Trimethylsiloxysilicate) and combinations thereof.

Other nonlimiting examples of suitable modified silicone carriers for use in the antiperspirant gelsolid stick compositions herein include the following modified silicones available from Goldschmidt: Abil EM-90 (silicone emulsifier); Abil EM-97 (polyether siloxane); Abil Wax 9810 (silicone wax or C24-28 methicone); Abil Wax 2434 (Stearoxy Dimethicone); Abil Wax 9800D (Stearyl Dimethicone); Tegomer H-Si 2111, H-Si 2311. A-Si 2120, A-Si 2320. C-Si 214 1. C-Si 234 1. E-Si 2130. E-Si 2330. V-Si 2150, V- Si 2550, H-Si 6420. H-Si 6440, H-Si 6460 (Alpha-Omega Dimethicone Copolymers) and combinations thereof.

Other nonlimiting examples of suitable modified silicone carriers for use in the antiperspirant gelsolid stick compositions herein include the following: Masil 756 from PPG Industries (Tetrabutoxypropyl Trisiloxane); bi-phenylhexamethicone (available as Silbione Oils 70633 V30 from Rhone-Poulenc): Silbione Oils 70646 (dimethicone copolyols from Rhone-Poulenc). Silicone L-71 1. L-720. L-721I and L722 (dirnethicone copolyols from Union Carbide); Silicone L-7000. L-7001, L-7002. L-7004. L-7500. L- 7600, L-7662, L-7604, L-7605, and L-7610 (dimethicone copolyols from Union Carbide); Unisil SF-R (dimethiconol from UPI). Silicate Cluster from Olin (Tris[tributoxysiloxyjmethylsilane), silicone copolymner F-754 (dimethicone copoly from SWS Silicones); and combinations thereof.

The anhydrous liquid carrier preferably comprises a volatile silicone carrier. These volatile silicone carriers may be cyclic, linear or branched chain silicones having the requisite volatillity defined herein.

Non-limiting examples of suitable volatile silicones are descnb~wd in Todd et al7"Vollale Silicone Fluids for Cosmetics", Cosmetics and Toiletries, 91:27-32 (1976), which descriptions are incorporated herein by reference. Preferred among these volatile silicones are the cyclic silicones having from about 3 to about 7.

more preferably from about 4 to about 5, silicon atoms. Most preferably are those which conform to the formula:

CH

3 Si-O

CH

3 n wherein n is from about 3 to about 7, preferably from about 4 to about 5, most preferably 5. These volatile cyclic silicones generally have a viscosity value of less than about 10 centistokes. All viscosity values described herein are measured or determined under ambient conditions, unless otherwise specified.

Suitable volatile silicones for use herein include, but are not limited to, Cyclomethicone (commercially available from G. E. Silicones): Dow Coming 344. and Dow Coming 345 (commercially available from Dow Coming Corp.); GE 7207. GE 7158 and Silicone Fluids SF-1202 and SF-1173 (available from General Electric SWS-03314. SWS-03400. F-222, F-223. F-250. F-251 (available from SWS Silicones Corp.); Volatile Silicones 7158. 7207. 7349 (available from Union Carbide); Masil SF-V available from Mazer) and combinations thereof.

The anhydrous liquid carrier may also comprise a non-volatile silicone carrier other than or in addition to the preferred modified silicone carriers described hereinbefore. These non-volatile silicone carriers are preferably linear silicones which include, but are not limited to, those which conform to either .of the formulas: CH CH 3

CH

3 H CH3 I I I I I I SCH Si CH 3-SiSi- i--CH 3

CH

3 CH3 CH 3 CH3 CH 3

CH,

n or n "wherein n is greater than or equal to I. These linear silicone materials will generally have viscosity values of up to about 100,000 centistoke. preferably less than about 500 centistoke. more preferably from about I centistoke to about 200 centistoke, even more preferably from about I centistoke to about 50 centistoke. as measured under ambient conditions. Examples of non-volatile, linear silicones suitable for use in the antiperspirant compositions include, but are not limited to, Dow Coming 200, hexamethyldisiloxane.

Rhodorsil Oils 70047 available from Rhone-Poulenc, Masil SF Fluid available from Mazer, Dow Coming 225. Dow Coming 1732, Dow Coming 5732, Dow Coming 5750 (available from Dow Coming Corp.): SF-96, SF-1066 and SF18(350) Silicone Fluids (available from G.E. Silicones); Velvasil and Viscasil (available from General Electric and Silicone L-45, Silicone L530, Silicone L-531 (available from Union Carbide), and Siloxane F-221 and Silicone Fluid SWS-101 (available from SWS Silicones).

-23- The anhydrous liquid carrier may further comprise, but is preferably substantially free of, organic, water-immiscible. polar liquid carriers or solvents. It has been found that the antiperspirant and deodorant efficacy of the gel-solid stick compositions are improved by minimizing or eliminating the amount of polar, organic, water-immiscible, liquid carriers or solvents in the composition. In this context, the term "substantially free" means that the gel-solid stick compositions preferably contain less than more preferably less than about even more preferably zero percent, by weight of an organic, waterimmiscible, polar liquid carrier or solvent. These polar solvents are liquid under'ambient conditions and include mono and polyhydric alcohols, fatty acids, esters of mono and dibasic carboxylic acids with mono and polyhydric alcohols, polyoxyethylenes, polyoxypropylenes, polyalkoxylates ethers of alcohols, and combinations thereof, provided that such solvents are also water-immiscible liquids under ambient conditions. Examples of some anhydrous liquid, water-immiscible, polar organic liquid carriers or solvents are described in Cosmetics, Science, and Technology. Vol. 1, 27-104. edited by Balsam and Sagarin (1972); U.S. Patent 4.202,879 issued to Shelton on May 13, 1980; and U.S. Patent 4.816.261 issued to Luebbe et al. on March 28, 1989, which descriptions are incorporated herein by reference.

The anhydrous liquid carrier may comprise anhydrous, water-miscible, polar organic liquid carriers .or solvents, examples of which include short chain alcohols such as ethanol. These and other polar organic carriers or solvents can be used as co-solvents for the solid non-polymeric gellant component of the antiperspirant gel-solid stick compositions herein. Non-limiting examples of polar co-solvents suitable for use herein are described in U.S. Patent 5,429.816. Other suitable polar co-solvents include those described hereinabove, which are preferably water-immiscible organic solvents, and other co-solvents such as phthalate co-solvents, benzoate co-solvents, cinnamate esters, secondary alcohols, benzyl acetate.

phenyl alkane and combinations thereof.

The anhydrous liquid carrier may comprise other non-polar carriers such as mineral oil. petrolatum.

isohexadecane, isododecane, various hydrocarbon oils such as the Isopar or Norpar series available from Exxon Corp. or Permethyl series available from Persperse. and any other polar or non-polar, watermiscible, organic carrier liquid or solvent known or otherwise safe and effective for topical application to human skin.

The anhydrous liquid carrier may also comprise fluorochemicals such as fluorosurfactants.

•fluorotelemers. and perfluoropolyethers, some examples of which are described in Cosmetics Toiletries.

Using Fluorinated Compounds in Topical Preparations. Vol. 11l, pages 47-62, (Oct. 1996) which description is incorporated herein by reference. More specific examples of such liquid carriers include, but are not limited to, perfluoropolymethyl isopropyl ethers, perfluoropolypropylethers, acrylamide fluorinated telomer, fluorinated amide surfactants, perfluorinated thiol surfactants. Other more specific examples include, but are not limited to, the polyperfluoroisopropyl ethers available from Dupont Performance Chemicals under the trade name Fluortess PFPE oils, and the series fluorosurfactants from Dupont Performance Chemicals under the trade name Zonyl Fluorosurfactants.

24- Optional Nucleating Agent The antiperspirant gel-solid stick compositions herein, made in accordance with the methods of the present invention, preferably further comprise a nucleating agent. The nucleating agent is used to minimize gellant particle size, and/or for obtaining the preferred gellant particle morphology described herein.

The nucleating agent for use herein must be a solid material under ambient conditions and have I) a melting point near the melting point of the selected gellant. 2) a solubility in the anhydrous liquid carrier that is less than the solubility of the solid non-polymeric gellant in the anhydrous liquid carrier, or 3) be in the form of an inorganic, insoluble, micronized particulate. Examples of suitable nucleating agents are described hereinafter.

The concentration of the nucleating agent in the composition is typically from about 0.0001% to about preferably from about 0.001% to about more preferably from about 0.01% to about 1%.

wherein the molar ratio of the solid non-polymeric gellant to the nucleating agent is from about 10:1 to about 1000:1. preferably from about 10:1 to about 100:1. Preferred nucleating agents are those having a melt point of from about 40 0 C below to about 200 0 C above, more preferably from about 20*C below to about 100C above, the melting point of the selected solid non-polymeric gellant.

*eo The antiperspirant compositions containing the nucleating agent are preferably prepared by 1) combining the solid non-polymeric gellant, anhydrous liquid carrier and a nucleating agent as described herein, 2) heating components or the combination of components to form a solution or other •homogeneous liquid or liquid dispersion, and 3) solidifying the combination of components by cooling the combination to below the solidification point of the solid non-polymeric gellant to form the antiperspirant composition of the present invention. During this process, the solid non-polymeric gellant is preferably melted or otherwise liquefied, and then allowed to solidify in the presence of the anhydrous liquid carrier and the nucleating agent. Also during this process, the nucleating agent is typically melted or otherwise liquefied (except for micronized, inorganic nucleating agents), and then in the presence of the anhydrous liquid carrier and the melted or liquefied gellant. the liquified nucleating agent crystallizes.

gels or otherwise solidifies and acts as a seed or nucleus to promote formation of small gellant nuclei during the crystallization of the gellant in the anhydrous liquid carrier.

The nucleating agent for use in the antiperspirant compositions include fatty alcohols, esters of fatty alcohols, ethoxylated fatty alcohols, esters or ethers of fatty acids including waxes, and triglycerides.

silica, titanium dioxide, solid polyol carboxylic acid polyesters, and mixtures thereof.

Suitable fatty alcohols for use as nucleating agents include monohydric alcohols, ethoxylated fatty alcohols, and fatty alcohol esters. Specific examples of commercially available fatty alcohol nucleating agents include, but are not limited to, Unilin 550, Unilin 700, Unilin 425, Unilin 400, Unilin 350. and Unilin 325, all supplied by Petrolite. Suitable ethoxylated fatty alcohols include, but are not limited, Unithox 325, Unithox 400, and Unithox 450, Unithox 480, Unithox 520, Unithox 550.

Unithox 720. Unithox 750, all of which are available from Petrolite. Non-limiting examples of suitable esters of fatty alcohols include tri-isostearyl citrate. ethyleneglycol di-12-hydroxystearate. tristearylcitrate, stearyl octanoate, stearyl heptanoate, trilaurylcitrate.

Suitable fatty acid esters for use as nucleating agents include ester waxes, monoglycerides, diglycerides, triglycerides and mixtures thereof. Preferred are the glyceride esters. Non-limiting examples of suitable ester waxes include stearyl stearate. stearyl behenate, palmityl stearate. stearyl octyldodecanol. cetyl esters, cetearyl behenate, behenyl behenate, ethylene glycol distearate. ethylene glycol dipalmitate, and beeswax. Examples of commercial ester waxes include Kester waxes from Koster Keunen. Crodamol SS from Croda and Demalcare SPS from Rhone Poulenc.

Preferred triglyceride nucleating agents include, but are not limited to, tristearin, tribehenate.

behenyl palmityl behenyl triglyceride. palmityl stearyl palmviyl triglyceride, hydrogenated vegetable oil.

hydrogenated rape seed oil. castor wax. fish oils. tripalmiten. Syncrowax HRC and Syncrowax HGL-C (Syncrowax is available from Croda. Inc.). Other suitable glycerides include, but are not limited to.

glyceryl stearate and glyceryl distearate.

Preferably, the nucleating agent is a solid polyol carboxylic acid polyester. Suitable solid polyol carboxylic acid polyesters include those which are polyol esters or polyesters wherein the carboxylic acid ester groups of the polyester comprise a combination of: long chain unsaturated carboxylic acid moieties or a mixture of long chain unsaturated carboxylic acid moieties and short chain saturated carboxylic acid moieties, and long chain saturated carboxylic acid moieties, the ratio of to (b) being from about I to 15 to about 2 to I. At least about 15%. preferably at least about 30%. more preferably at least about 50%. and most preferably at least about 60% by weight of the total carboxylic acid moieties of the polyesters are C20 or higher saturated carboxylic acid moieties. The long chain unsaturated carboxylic acid moieties are typically straight chain and contain at least about 12, preferably about 12 to about 26, more preferably about 18 to about 22 carbon atoms. The most preferred unsaturated carboxylic acids are the C18 mono and/or di unsaturated carboxylic acids. The short chain saturated carboxylic acids are typically unbranched and contain about 2 to about 12, preferably about 6 to about 12, and most preferably about 8 to about 12 carbon atoms. The long chain saturated carboxylic acids are typically straight chain and contain at least about 20, preferably about 20 to about 26. and most preferably about 22 carbon atoms. The molar ratio of Group carboxylic acid moieties to Group (b) carboxylic acid moieties in the polyester molecule is from about 1:15 to about 2:1, preferably about 1:7 to about 5:3, and more preferably about 1:7 to about 3:5. The average degree of esterification of these carboxylic acid esters is such that at least about 2 of the hydroxyl groups of the polyol are esterified. In the case of sucrose polyesters from about 7 to about 8 of the hydroxyl groups of the polyol are preferably -26esterified. Typically, substantially all. at least about 85%, preferably at least about 95%, of the hydroxyl groups of the polyol are esterified.

Preferred polyols of the solid polyol carboxylic acid esters are sugars, including monosaccharides and disaccharides and trisaccharides, containing from about 4 to about 11 hydroxyl groups. Most preferred sugars are those which contain about 4 to about 8. more preferably about 6 to about 8 hydroxyl groups. Examples of those containing four hydroxyl groups are the monosaccharides xylose, arabinose, and combinations thereof. Suitable five hydroxyl group-containing polyols are the monosaccharides galactose, fructose, mannose, glucose, and combinations thereof. Examples of disaccharide polyols which can be used include maltose. lactose, sucrose, and combinations thereof, all of which contain eight hydroxyl groups. The preferred polyol is sucrose.

Examples of long chain unsaturated carboxylic acid moieties include, but are not limited to.

lauroleate. myristoleate, palmitoleate, oleate, elaidate, erucate, linoleate, linolenate. arachidonate.

eicosapentaentoate. and docosahexaenoate. For oxidative stability, the mono- and diunsaturated fatty acid moieties are preferred.

Examples of suitable short chain saturated carboxylic acid moieties include, but are not limited to. acetate, caproate, caprylate, caprate, and laurate.

Examples of suitable long chain saturated carboxylic acid moieties include, but are not limited to. arachidate. behenate. lignocerate, and cerotate.

Of course, the long chain unsaturated carboxylic acid moieties can be used singly or in mixtures with each other or in mixtures with the short chain saturated carboxylic acid moieties. in all proportions.

Likewise, the long chain saturated carboxylic acid moieties can be used in combination with each other in all proportions. Mixed carboxylic acid moieties from source oils which contain substantial amounts of *0 the desired unsaturated or saturated acids can be used as the acid moieties to prepare compounds for use as nucleating agents herein. The mixed carboxylic acids from the oils should contain at least about preferably at least about 50%, and most preferably at least about 80% of the desired unsaturated or saturated acids. For example, rapeseed oil fatty acids or soybean oil fatty acids can be used instead of pure C12-C16 unsaturated fatty acids. Hardened, i.e. hydrogenated, high erucic rapeseed oil fatty acids can be used instead of pure C20-C26 saturated acids, Preferably the C20 and higher acids, or their derivatives, e.g. methyl or other low alkyl esters, are concentrated for example by distillation. The fan.

acids from palm kernal oil or coconut oil can be used as a source of C8 to C12 acids, An example of the use of source oils to make solid polyol polyesters for use in the antiperspirant compositions herein is the preparation of solid sucrose polyester, employing the fatty acids of high oleic sunflower oil and substantially completely hydrogenated high erucic rapeseed oil. When sucrose is substantially completel'.

esterified with a 1:3 by weight blend of the methyl esters of the fatty acids of these two oils, the resulting sucrose polyester will have a molar ratio of unsaturated C18 acid radicals to C20 and higher saturated -27acid radicals of about 1:1 and about 28.6 weight percent of the total fatty acids in the polyester will be C22 fatty acids.

The higher the proportions of the desired unsaturated and saturated acids in the carboxylic acid stocks used in making the solid polyol polyester, the more efficient the ester will be in its ability to function as a nucleating agent.

Examples of solid polyol carboxylic acid polyester nucleating agents for use in the antiperspirant composition herein include, but are not limited to, the octaester of raffinose in"which the esterifying carboxylic acid moieties are linoleate and behenate in a 1:3 molar ratio: the heptaester of maltose wherein the esterifying carboxylic acid moieties are sunflower seed oil fatty acids and lignocerate in a 3:4 molar ratio; the octaester of sucrose wherein the esterifying carboxylic acid moieties are oleate and behenate in a 2:6 molar ratio; and the octaester of sucrose wherein the esterfying carboxylic acid moieties are laurate.

linoleate and behenate in a 1:3:4 molar ratio. A preferred material is sucrose polyester in which the degree of esterification is 7-8, and in which the fatty acid moieties are C18 mono- and/or di-unsaturated and behenic, in a molar ratio of unsaturates:behenic of 1:7 to 3:5. A particularly preferred polyol ester nucleating agent is the octaester of sucrose in which there are about 7 behenic farty acid moieties and about I oleic moiety in the molecule.

The solid carboxylic acid polyesters herein can be made according to prior an known methods for preparing polyesters of polyols. See. for example U.S. Patent No. 5,306.516, to Leton et al.. issued April 26. 1994; U.S. Patent No. 5,306,515, to Letton et al.. issued April 26. 1994; U.S. Patent No.

5.305.514. to Letton et al., issued April 26. 1994; U.S. Patent No. 4.797.300, to Jandacek et al.. issued January 10. 1989; U.S. Patent No. 3.963.699. to Rizzi et al., issued June 15. 1976; U.S. Patent No.

4.518,772. to Volpenhein. issued May 21, 1985; and U.S. Patent No. 4.517.360. to Volpenhein, issued May 21, 1985; all of which are incorporated by reference herein in their entirety.

Suitable inorganic, micronized. non-solubilized nucleating agents for use in the antiperspirant .::compositions include materials such as silica, titanium dioxide and combinations thereof. These materials contain submicron panicles (average panicle size generally less than about I pm) which aid in the production of small gellant crystals or particles.

Preferred nucleating agents, and preferred concentrations of the nucleating agents, for use in the "antiperspirant compositions include C18 succinic acid 1.9-nonanedioc acid Teflon silica polysiloxane copolymer sucrose octabehenate 0.75%, Unilin 350 Unilin 550 Unilin 700 trihydroxystearin and combinations thereof.

Optional Components The antiperspirant gel-solid stick compositions made in accordance with the methods of the present -invention may further-comprise one-or more optional components which may modify the physical, chemical or aesthetic characteristics of the compositions or serve as additional "active" components when deposited on the skin. The compositions may also further comprise optional inen ingredients. Many such -28 optional materials are known in the antiperspirant art and may be used in the antiperspirant compositions herein, provided that such optional materials are compatible with the essential materials described herein, or do not otherwise unduly impair product performance.

Non-limiting examples of optional materials include active components such as bacteriostats and fungiostats, and "non-active" components such as colorants, perfumes, emulsifiers, chelants, distributing agents, preservatives, residue masking agents, process aides such as viscosity modifiers, and wash-off aids.

Examples of such optional materials are described in U.S. Patent 4.049,792. Elsnau. issued September 1977; Canadian Patent 1.164.347, Beckmeyer et al., issued March 27, 1984: U.S. Patent 5.019.375, Tanner et al., issued May 28, 1991: and U.S. Patent 5.429,816. Hofrichter et al., issued July 4, 1995; which descriptions are incorporated herein by reference.

The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention can also be formulated to comprise other dispersed solids or other materials in addition to or in place of the particulate antiperspirant active. Such other dispersed solids or other materials include any material known or otherwise suitable for topical application to human skin. The antiperspirant gel-solid stick compositions can also be formulated as gel-solid stick compositions which contain no antiperspirant or other active material, particulate or otherwise.

Method of Manufacture The antiperspirant gel-solid stick compositions herein are prepared in accordance with the methods herein. These methods preferably include any known or otherwise effective techniques suitable for making a crystalline matrix containing elongated non-polymeric gellant crystals having an aspect ratio of greater than about 2, preferably greater than about 6, and/or an average panicle diameter that is minimized "(preferably to less than about 1 pm). Techniques for minimizing crystalline panicle size in a the antiperspirant gel-solid compositions herein include the use of nucleating agents, formulation with select carriers or gellants or carrier/gellant combinations, controlling rates of crystallization including controlling formulation, controlling process flow rate. and processing temperatures, and other methods described herein. All such methods should be applied to the formulation to preferably control or minimize gellant crystal particle size, and/or to form the desired elongated crystalline particles, to thus form the desired crystalline matrix of the compositions herein.

Crystalline particle size in the compositions herein can be determined by techniques well known in the art, which includes light or electron microscopy of the composition, wherein the composition is formulated for analysis purposes without particulate antiperspirant active or other solid particulates Without such reformulation, it is more difficult to directly determine and distinguish crystalline gellant particle size and morphology from the particle size and morphology contributed from other non-gellant particulates. The reformulated composition is then evaluated by light or electron microscopy or other similar method.

Method of Use 29 The antiperspirant gel-solid stick compositions made in accordance with the methods of the present invention may be applied topically to the axilla or other area of the skin in an amount effective to treat or reduce perspiration wemess and malodor. The composition is preferably applied in an amount ranging from about 0.1 gram to about 20 grams, more preferably from about 0.1 gram to about 10 grams. even more preferably from about 0.1 gram to about I gram, to the desired area of the skin. The compositions are preferably applied to the axilla or other area of the skin, one or two times daily, preferably once daily.

to achieve effective antiperspirant and malodor control over an extended period.

Throughout the description and claims of this specification the word "comprise", and variations of the word such as "comprising" and "comprises", is not intended to exclude other additives or components or integers or steps. E. XAMPLES The following non-limiting examples illustrate specific embodiments of the antiperspirant gel-solid stick compositions herein, made in accordance with the methods of the present invention.

Each of the exemplified compositions are prepared by combining all of the listed components except the antiperspirant active and other materials such as perfumes. The combined components are heated to about 100*C with agitation to form a hot liquid. after which all other materials are added to the heated liquid. The heated liquid is allowed to cool with agitation until just before the point of solidification, at which point the cooled, liquid composition is filled into applicator packages and allowed to cool and solidify to the requisite product hardness.

Each of the exemplified compositions comprise a crystalline gel matrix containing crystalline particles having an aspect ratio of greater than about 6. and an average crystalline gellant panicle size of less than about I pm. Each of the exemplified compositions also have a visible residue index of between about I I and about 30 L-value. a product hardness of between about 500 and 5.000 gram-force. and a ratio of between about 0.1 and about 100. Each of the exemplified antiperspirant compositions are applied topically to the axilla area of the skin. in accordance with the methods of use described herein, and provide improved low residue performancec efficacy and aesthetics.

Page(s) 4-2. -47 -are claims pages They appear after the table listings so Table I IComponent No. I No2 No.3 No. -4 No. 5 1No. 6 No. 7 No.81 Cvclomethicofle 1 47.8 47.8 48 48 48 40.5 47.8 45.5 f- Perlau 15.75 Ocr-vldodecanol 14.0 14.0 114.01 14.0 14.0 14.0 12-HvdroxysteariC Acid 9.0 7.0 7.5 8-0 7.0 6.75 C20-40 alcohols 2 0.5 0..5 0.5 0.5 0.5- 0.5 j Dimethicone Copolyol 3 2.0 C20-40 Pareth- 10 4 1.25 -1.25 1.25 .1.25 1.25 1.25 C20-40 Pareth-40 5 1.25 1.25 1.25 -1.25 1.25 1.25 N-isopropyl- 12-hydroxy 9.0 stearamide Sodium EDTA 0.2 0.2 0.2 C 12-15 Alkvibenzoate 6 25 Triacetin. Soybean oil 1-vrxvstearamide 9.0 AlI Zr tri chlorohydrex 26 26.0 26 26 26 26 26 26 Residue (-value) 29.5 27 24 30 29 30 29 IHardness (aram-force) 1480 1150 2500 800 650 900 1090 1000 IG'G ratio 10 10 _20 _L 5 5 10 10 a.

a.

a a a a e a a a a a a. a I Dow Coming 245 Fluid. General Electric SF-120: 2 Petrolite Unilin 425 3- Dow Coming 3225C 4 Petrolite Unithox 450 Petrolite Unithox 480 6 Finsolv TN from Finetex

LLJ

-31 _____Table 2 Component No. I No. 2 No.3 No. 4 1No. 5 No.6 No.7 Cvclomethicone 115 19.5 45 40 I 60 19.7 19.7 Petrolatum 44.3 46.3 12-Hvdroxvstearic acid 7.0 3.5 7.0 1 7.0 8.0 8.0 1 2-Dodecyl-N.N'- 2 1 2 2 dibutvisuccinamide________ Polyether siloxane 2 5.0 Dimethicone copolyol 3 50 50 Dimethyl-diphenyl- 20 siloxane 4 Silicone polyether 25 copolymer Stearvi alcohol 1.0 Sucrose polyester 6 1.0 1.0 Al Zr trichiorohydrex glyc 26 26 26 26 26 26 26 Residue (L-Value) 23.5 24 23 21 29 23 27 Hardness (gram-Force) 2300 1200 850 750 1230 1250 990 G_ IS 1 10 10 510 10 j S S 0 0* 0 S *0 0S S. 0 @0 5 0 0 @9 0 S 0e. *500

S

S S 0000 0

OSSS

0@ OS@@00 I Dow Corning 245 Fluid: General Electric SF- 1202 2 EM-97 from Goldschmidt 3 DC-3225C from Dow Coming 4 SF- 1023 from G.E. Silicones 5- SF- I I 88a from G.E. Silicones 6 Sucrose octaester esterified predominately with behenic acid moieties 32 Table 3 Component No. I No. 2 No. o. 4 No. 5 No. 6 Cyclomethicone 115 19.5 45 40 60 47.8 I 2-Hydroxystearic acid 7.0 3.5 7.0 7.0 8.0 7 2-Dodecyl-N.N'- 2 1 2 dibutylsuccinamide Polvether siloxane 2 5.0 Dimethicone copolyol 3 50 50 Dimethyl-diphenyl- 20 slioxane 4 Silicone polyether 25 copolymer Sucrose polyester 6 L0 Octodocecanol 14 Dimethicone copolyol 7 Disodium EDTA 0.2 C20-C40 Alcohol 8 C20-C40 Pareth 10 9 1.25 C20-C4O Pareth 40 1 0 1.25 Al Zr trichlorohydrex glyc 26 26 26 216 26 26 Residue (L-Value) 23 .5 24 23 21 29 Hardness (gram-Force) 2300 11200 850 750 1230 G' G 1 10 10 5 a a a a a. I Dow Coming 245 Fluid; General Electric SF- 1202 2 EM-97 from Goldschmidt 3 DC-322SC from Dow Coming 4 SF-1023 from G.E. Silicones SF- I IS88a firom G.E. Silicones 6 Sucrose octaester esterified predominately with behenic acid moieties 7- DC- 1401 from Dow Coming 8 Unilin 425 from Petrolite 9- Unithox 450 from Petrolite Unithox 480 from petrolite 33 Table 4 IComponents No. I No.2 No. 3 No. 4 Cyclomethicone D51 58.0 48.0 47.8 47.8 Ocrvldodecanol- 14.0 14.0 13.0 14.0 12-Hvdroxvstearic Acid 3 9.0 9.0 7.0 2 dodececyl-N.N'-dibutylsuccinamide 4 -2.0 2 dodececyl-N.N'-dihexylsuccinamide. C20-40 alcoholst)- 0.5 0.5 C20-40 Pareth-lO 10 1.25 1.25 1.25 C20-40 Pareth-403 1.25 1.25 1.25 Al Zr tri chiorohydrex glycinate 2) 26. 0 26.0 26.0 Disodium EDTA I' u 0.2 0.2 Perfume -1.0 Residue L-value) 30.0 28.0 24.0 25.0 Hardness (gram-force) 850 1100 1300 1000 Dimer-to-monomer Ratio 1 .9 2.0 6.0 I Dow Corning 245 Fluid; General Electric SF. 1202 2 Jarchem Jarcol 1-20 3 Acme Hardesty 4 Procter Gamble Procter Gamble 6 Petrolite Unilin 425 7 Petrolite Unithox 450 8 Petrolite Unithox 480 Supplied by Westwood Chemical Corporation 10 Supplied by Ciba-Geigy I I Procter Gamble 12 Aldrich 13 Procter Gamble W4 Witco -34 Table Component No. I No. 2 No. 3 No. 4 Cvclomethicone D5 1 47.8 47.8 47.8 49_T. 7 OcrvldodecanoV- 14.0 14.0 14.0 14.0 12-Hydroxystearic Acid-' 7.0 7.0 7.0 2- Hydrox y-I1.2,3-propane trioctylamide 2.0 Beeswax I 2.0 2-Hydrox y-l.2,3-propane trihxylaide 2.0 C20-40 alcohols6 0.5 0.5 0.5 C20-40 Pareth- 10 1.25 1 1.25 1.25 1.25 C20-40 Pareth-405 1.25 1.25 1.25 1.25 Al Zr tri chlorohydrex glycinateli 26.0 26.0 26.0 26.0 Disodium EDTA IU 020.2 Stearyl Alcohol' 4- 0.1 Residue L-value) 30.0 30.0 22.0 27.0 Hardness (gram-force) 750 1200 .1200 990 Dimer-to-monomer Ratio 2.0 1.2 7.0 1 Dow Coming 245 Fluid; General Electric SF. 1202 2 Jarchem Jarcol 1-20 3 Acme Hardesty 4 Procter Gamble Procter Gamble 6 Petrolite Unilin 425 7 Petrolite Unithox 450 8 Perrolite Unithox 480 9 Supplied by Westwood Chemical Corporation 10 Supplied by Ciba-Geigy I I Procter Gamble 12 Aldrich 13 Procter Gamble 14 Witco 35 Table 6 Component No. 1 No.2 No.3 No.4 C~clomethicone D51 5. 45.8 19. 19.7__ Octvidodecanol-' 16.4 16.4 Petrolatum-' 44.3 46.3 12-Hydroxystearic Acid" 8.0 8.0 8.0 C20-40 alcohols-) 0.5 Sucrose Polyestero 1.0 1.0 1.0 C2 0-40 Pareth- 10 1 1.25 1.25 C20-40 Parcth405 1.25 1.25 Stearvl Alcoho19 1.0 Perfume 0.1 0.1 A] Zr tri chiorohvdrex glycinae lu 26. 0 26.0 260 2.

Disodium EDTA' 02 0.2 Residue CL-value) 25.0 24.0 23.0 27.0 Hardness (gramn-force) 1.300 L .250 1250 990

C

C

C

36 Table *7 r I No.1 I No.2 No. 3 f- ^npnt I No. I i No.2 No. 3 N4 I rstl Cyc~OmCtflIC0flC L~Y Ocwvldodecanol-' 16. 5 16.5 16.5 16.5 l2.Hvdroxvstearic Acid4 8.0 9.0 j 0.0 11.0 C20-40 alcoholsy- 0.5 0.5 j 0.5 Sucrose Polvesterli 1.0 1.0 1 1.0 C20-40 Pareth- 10' 1.25 71.25 1.25 C20-40 Pareth-& 1.25 1.25 1.25 1.25 Al Zr tri chiorohydrex glycinate IU 26.0 26.0 26.0 26.0 Disodium EDTA' 0.2 0.2 0.2 Residue (Lvalue) 25.0 27.0 I27.5 28.0 Hrness tgrani-force) 1170 1450 1660 1910

S

Table Cornponent No. I No.2 No.- 3 No.4 Cyclomethicone DS' 1 49.7 49.7 49.7 49.7 Ocrv IdodecanoI-' 14.0 14.0 14.0 14.0 I 2.Hydroxystearic Acid 4 7.0 7.0 7.0 C20-C40 Acohols' 0.5 0.5 0.5 C20-40 PareT-lO' 1.25 1.25 1.25 1.25 C20-40 Pareth-400 1.25 1.25 1.25 1.25 Al Zr tri chlorohydrex glycinateivU 26.0 26.0 26.0 26.0 Disodiurn EDTA Fl 0.2 0.2 0.2 0.2 2.Stearvbuanedioc Acid 1. 0.1 1.9-Nonanedioc Acid I 0.1 Polyfluorocarbon 0.1 Silica' I 0.1 Residue (L-value) 29.0 30.0 29.0 27.5 Hardness (gram-force) 11200 1200 1110 1150 Table 9 Componenet No. I No. 2 No.3 No.4 Cyclomethicone D51 49.3 48.8 I49.05 45.3 IOcrvldodecanol-4 14.0 14.0 14.0 16.5 12-Hydroxystearic Ai 4 7.0 7.0 7.0 8.99 C20-C40 Alcohols-' 0.5 0.5 0.5 C20-40 Pareth-101 1.25 1.25 1.25 1.25 C20-40 Pareth-408 1 .25 1.25 1.25 1.25 Al Zr tri chlorohydrex glycinate" 26. 0 26.0 26.0 26.0 Disod ium EDTA 1 0.2 0.2 0.2 0.2 Sucrose Poiycsterb 0.5 1.0 0.75 0.1 Residue (L-value) 27.5 25.0 28.0 27.0 Hardness (gram-force) 1480 1150 1100 2700 Table Component No. I No. 2 No. 3 Cyclomethicone D51 49.7 49.7 49.7 OctvldodecanoF- 14.0 14.0 14.0 12-Hydroxystearic Acid~' 7.0 7.0 C20-C40 Alcohols.) 0.5 0.5 C20-40 Pareth.I0 1 1.25 1.25 1.25 C20-40 Pareth-405 1.25 1.25 1.25 Al Zr tri chiorohydrex glycinatc IV 26.0 26.0 26.0 Disodium EDTA I 0.2 0.2 0.2) C20-C40 Alcohols' 0.1 C20-C40 Alcohols I 0.1 C20-C40 A icohols 1 0.1 Residue (L-value) 28.5 29.0 29.0 Hardness (gram-force) 1140 1140 11050 *5 S

S

S. SW

SS

S. S -38 Table I I IComponent N o. 1. No. 2 No. 3 Cyclomethicone D51 49.7 49. 49.7__ OcrNvldodecano-2 14.0 14.0 14.0 12-Hydroxvstearic Acid4 7.0 7.0 C20-C40 Alcohols.) 0.5 0.5 0.5 1 C20-40 Pareth-10 1 1.25 1.25 1.25 C20.40 Pareth-4013 1.25 1.25 1.25 Al Zr tri chiorohydrex glycinatelu- 26.0 26.0 26.0 Disodiumn EDTA I 0.2 0.2 0.2 Trihvdroxystearin 1 0.1

I

Stearyl Alcoholy 0.1 I_ Cetearvl Alcohol"--- 0.1 Residue (L-value) 30.0-F -27.0 27.0 Hardness (gram-force) 1000 990 990 Table 12 Cornponent No. I No. 2 No. 3 No. 4 Cyclomethicone D51 45.3 45.8 19.7 19.7 Octvldodecanol- 16.4 16.4 Perrolatumi 44.3 45.3 N-lauroyl-glutamic acid dibutyl amide'I 8.0 8.0 8.0 12-Hydroxystearic Acd C20-40 alcohols-) 0.5 Sucrose PolyesterO 1 .0 1 .0 C20-40 Pareth-1O' 1.25 1.25 C20.40 Pareth-40 8 1.25 1.25- Stearyl Alcoholv 1.0 Perfume 0.1 AlI Zr tri chiorohydrex glycinate IU 26.0 26.0 26.0 26.0 Disodiurn EDA 0.2 0.2 Residue (L-value) 25.0 24.5 22.0 19.0 Hardness (gramn-force) 1000 1000 1250 1500 a. a

A

a..

Table 13 Component 1No. I No. 2 No. 3 No. 4 Cvclomethicone D51 45.3 45.8 36.3 60.0 Octvldodecanol- 16.4 16.4 16.4 2 dodececy l-N. N-d iburyIsucc inam ide5, 8.0 N-isopropyl- I 2-hydroxystearamide-' 8.0 l2-Hvdroxystearic Acid 4 16.0 C20-40 alcohols:) 0.5 0.5 Sucrose Polvestero I .0 1.0 2.0 C20-40 Pareth-10 J 1.25 1.25 1.25 C20-40 Pareth-4015 1.25 1.25 1.25 Perfume 0.1 0.1 0.1 Al Zr tri chiorohydrex glycinate' 26.0 26.0 26.0 26.0 Disodium EDTA 1 1 0.2 0.2 0.2 Polyether siloxane, 4 Residue (L-value) 25.0 28.0 24.0 29.5 Hardness (gram-force) 1000 1500 2500 1050 f For Tables 6-131 1 Dow Corning 245 Fluid; General Electric SF-1202 2 Jarchem Jarcol 1-20 3 Witco White Perfecta 4 Acme Hardesty Petrolite Unilin 425 6 Sucrose octaester esterified predominately with behenic acid moieties 7 Petrolite Unithox 450 8 Perrolite Unithox 480 *9 Q-Witco 10.- Supplied by Westwood Chemical Corporation Supplied by Ciba-Geigy 12 Humphrey Chemicals 13 Aldrich 14 -Aldrich Cabot 16.- Petrolite Unilin 350 17 Pntolite Unilin 550 -Witco 21 Ajinimoto 22 Procter Gamble 23 Starks Associates 24 Goldschmidt EM-97 Wv 76/14 IVDA 40 14 Component No. I No. 2 No.3 No..4 Cvclomethicone 1 45.9 48.0 47.8 42.3 Ocrvldodecanol 2 13.4 14.0 14.0 Petrolatum .16.5 12-Hvdroxvstearic Acid 4 9.8 6.8 6.8 C20-40 alcohols 5 0.5 0.5 2-Dodecyl-N.N- 3.2 9.0 2-.2 1.1 dibutvlsuccinam ide 2-Dodecyl-N.N'- -1.1 dihexvlsuccinamide C2 0-4O0Pareth-10 6 1.2 1.25 1.25 C20-40 Pareth-40 '7 1.2 1.25 1.25 C20-40 Pareth-3 8 Perfume Al Zr tri chlorohydrex 24.8 26.0 26.0 26.0 glycinate 9 Disodium EDTA 10 0.2 0.2 Stearyl Alcohol I I I -Dow Coming 245 Fluid; General Electric SF- 1202 2 Jarchem Jarcol 1-20 3 Witco White Perfecta 4 Acme Hardesty 5 Petrolite Urtilin 423 6 Petrolite Unithox 450 7 Petrolite Unithox 480 8 Petroliwe Unithox 320 9 Supplied by Westwood Chemical Corporation 10 Supplied by Ciba-Geigy I I Witco a a.

a. -41 Table Component No. I No. 2 No. 3 No. 4 Cv-clomethicone 157.6 58.0 55.8 52.8 Ocrvldodecanol 2 13.4 14.0 14.0 Petrolatum 3 16.5 I 2-Hvdroxystearic Acid 4 0.7 C20-40 alcohols 5 0.5 2-Dodecyl-N.N'- 0.3 2.0 0.2 diburvisuccinamide 2-Dodecyl-N.N'- dihexvlsuccinamide C20-40 Pareth- 10 6 1.2 1.25 C20-40 Pareth~0 7 1.2 1-I.25 C20-40 Pareth-3 8 Perfume Al Zr tri chlorohydrex 24.8 26.0 26.0 20.0 glycinate 9 Disodium EDTA 10 0.2 0.2 Stearvl Alcohol I I I Dow Corming 245 Fluid. General Electric SF-1202 2- Jarchem Jarcol 1.20 3, Witco White Perfecta 4 Acme Hardesty 5 Petrolite Unilin 425 6 Pevolite Unithox 450 7- Petrolite Unithox 480 8 Petrolite Unithox 320, 9 Supplied by Westwood Chemical Corporation 10 Supplied by Ciba-Geigy I I Witco a 9 a *aao a.

a. a

Claims (20)

1. A method for making an anhydrous antiperspirant gel-solid stick composition, which method comprises the steps of: combining the following components: from 0.5% to 60% by weight of particulate antiperspirant active; (ii) from 1% to 15% by weight of a solid non-polymeric gellant that is substantially free of organic polymeric gellants, inorganic thickening agents, dibenzylidene alditol, n-acyl amino acid derivatives or combinations thereof; and (iii) from 10% to 80% by weight of an anhydrous liquid carrier having an average solubility parameter of from 3 to 13 (cal/cm 3 5 and liquefying the solid non-polymeric gellant; and then solidifying the liquefied gellant in the presence of the anhydrous liquid carrier and particulate antiperspirant active to form an antiperspirant gel-solid composition having a visible residue index of from 11 to 30 L- value, a product hardness of from 500 gram-force to 5,000 gram-force, and a ratio of an elastic modulus to a viscous modulus of from 0.1 to 100, wherein the refractive indices of the particulate antiperspirant active, the solid 20 non-polymeric gellant, and the anhydrous liquid carrier are not matched.

2. A method for making an anhydrous antiperspirant gel-solid stick composition according to claim 1 wherein said liquefied gellant is solidified in the S. presence of the anhydrous liquid carrier and particulate antiperspirant active to form an antiperspirant gel-solid composition having a product hardness of from 750 gram-force to 2000 gram-force.

3. A method for making an anhydrous antiperspirant gel-solid stick composition according to any one of claims 1 to 2 wherein said antiperspirant gel- solid composition has a ratio of an elastic modulus to a viscous modulus from 0.1 to W:\Efsabeth\PJX\WORKU588230P.DOC 43

4. A- method- forr making n- anhydrous antiperspirant gel-solid stick composition according to any one of claims 1 to 3 wherein the refractive indices of the particulate antiperspirant active, the solid non-polymeric gellant, and the anhydrous liquid carrier differ by at least 0.04. A method for making an anhydrous antiperspirant gel-solid stick composition according to any one of claims 1 to 4 wherein said antiperspirant gel- solid composition is substantially free of solid fatty alcohols having from 12 to carbon atoms.

6. A method according to any one of claims 1 to 5 wherein the solid non- polymeric gellant is selected from the group consisting of fatty acid gellants, esters and amides of fatty acid gellants, hydroxy fatty acids, cholesterolic materials, lanolinolic materials, and combinations thereof.

7. A method according to claim 6 wherein the solid non-polymeric gellant is selected from the group consisting of 12-hydrostearic acid, esters of 12- hydroxystearic acid, amides of 12-hydroxystearic acid and combinations thereof. 20 8. A method according to claim 6, wherein the solid-non-polymeric gellant is selected from the group consisting of 12-hydroxystearic acid, 12-hydroxystearic acid methyl ester, 12-hydroxystearic acid ethyl ester, 12-hydroxystearic acid stearyl ester, 12-hydroxystearic acid benzyl ester, 12-hydroxy stearic acid amide, isopropyl amide of 12-hydroxystearic acid, butyl amide of 12-hydroxystearic acid, benzyl amide of 12-hydroxystearic acid, phenyl amide of 12-hydroxystearic acid, t-butyl amide of 12-hydroxystearic acid, cyclohexyl amide of 12-hydroxystearic acid, 1-adamantyl amide of 12-hydroxystearic acid, 2-adamantyl amide of 12- hydroxystearic acid, diisopropyl amide of 12-hydroxystearic acid, and combination thereof.

9. A method according to claim 6 wherein the solid non-polymeric gellant is

12-hydroxystearic acid. W:EiabePJCXWMORKU5M30DO J, 44 A method according to any one of claims 1 to 5 wherein the solid non- polymeric gellant comprises a gellant conforming to the formula: R 9 0 R I ii I R -C N -R, I a R 7 R 3-X -Y -Z -R 8 i o1 R C -C -N-R 4 I I R R 6b wherein R 6 a) R, is nil, hydroxy, hydrogen, aryl, siloxane or saturated or unsaturated, substituted or unsubstituted, straight, branched or cyclic chain C,-C2 alkyl, C,-C2 alkenyl, C,-C22 alkoxy, C,-C22 alkyl esters, Cl-C2 alkyl ethers, or C1-C2 alkyl substituted aryl; b) R 2 R Rs and R 6 are independently or together, hydrogen, hydroxy, aryl, siloxane or saturated or unsaturated, substituted or unsubstituted, straight, branched or cyclic chain C-C22 alkyl, C,-C2 alkenyl, C,-C2 alkoxy, C-C22 alkyl esters, C,-C22 alkyl ethers, or C,-C22 alkyl substituted aryl; c) R 3 is nil, hydroxy, hydrogen, saturated or unsaturated, substituted, or unsubstituted, straight, branched or cyclic chain C,-C 4 alkyl, C,-C4 alkenyl, C,-C4 20 alkoxy, C,-C4 alkyl esters or C,-C4 alkyl ethers; d) R 7 and R 8 are independently or together, nil, hydrogen, hydroxy, aryl, siloxane or saturated or unsaturated, substituted or unsubstituted, straight, branched or cyclic chain C,-C2 alkyl, C,-C2 alkenyl, C,-C2 alkoxy, C,-C2 alkyl esters, C,-C22 alkyl ethers, or C,-C22 alkyl substituted aryl; e) R, is nil or hydrogen; f) R 10 and are independently or together, nil, hydrogen, hydroxy, aryl, siloxane or saturated or unsaturated, substituted or unsubstituted, straight, branched or cyclic chain C,-C6 alkyl, alkenyl, alkoxy, C,-C6 alkyl esters, C,-C6 alkyl ethers, or C1-C6 alkyl substituted aryl; g) X is nil, nitrogen, aryl or -(CH 2 where n is an integer from 1 to 6; h) Y is nil, acyl or carbonyl; i) Z is nil, hydrogen, hydroxy, aryl, siloxane, nitrogen or saturated or unsaturated, substituted or unsubstituted, straight, branched or cyclic chain C,-C22 W:\Elisabeth\PJCWORKUW88230P.DOC alkyl, C,-C22 alkenyl, C,-C2 alkoxy, C,-C22 alkyl esters, C,-C22 alkyl ethers, or C,- C22 alkyl substituted aryl; and j) is a double or single bond, provided: when X is nil, Y, Z, R 3 R, and R 8 are nil, C' is bonded directly to C" and R, is not a hydrogen; (ii) when X and Z are not nil and Y is nil, X is directly bonded to Z; (iii) when Z is nil, a hydrogen or a hydroxy, R, and R 8 are nil; and (iv) when is a double bond, R 3 and R 9 are nil. 11. A method according to any one the preceding claims wherein the solid non-polymeric gellant are in the form of elongated crystalline particles having an aspect ratio of at least 2. 12. A method according to claim 11 wherein the solid non-polymeric gellant are in the form of elongated crystalline particles having an aspect ratio of at least 6.

13. A method according to any one of the preceding claims wherein the solid non-polymeric gellant are in the form of crystalline particles having an average 20 particle size of less than 1 pim,

14. A method according to claim 13 wherein the solid non-polymeric gellant are in the form of crystalline particles having an average particle size of less than .0.2 pm. i* 15. A method according to any one of the preceding claims wherein the composition has a Differential Scanning Calorimeter onset temperature of from 25°C to 850C. *e

16. A method according to claim 15 wherein the composition has a Differential Scanning Calorimeter onset temperature of from 30°C to w-\Efiabetm\PJCWORKU530P.DOC 46

17. A method according to any one of the preceding claims wherein the anhydrous liquid carrier comprises a -fluorochemical selected from the group consisting of fluorosurfactants, fluorotelemers, perfluoropolyethers, and combinations thereof.

18. A method according to any one of the preceding claims wherein the composition further comprises from 0.001% to 2% by weight of a solid nucleating agent.

19. A method according to claim 18 wherein said solid nucleating agent is selected from the group consisting of fatty alcohols, fatty acid esters, fatty acid ethers, solid polyol carboxylic acid polyesters, and mixtures thereof. A method according to claim 18 wherein said solid nucleating agent is a solid polyol carboxylic acid polyester having a polyol moiety and at least 2 carboxylic acid moieties wherein the polyol moiety contains at least 4 hydroxyl groups, wherein the carboxylic acid moiety consists essentially of C12 or higher unsaturated carboxylic acid moieties, and C20 or higher saturated Scarboxylic acid moieties, the molar ratio of to being from 1:7 to 3:5, and 20 wherein at least 2 of the hydroxyl groups of the polyol moiety are esterified with carboxylic acid moieties.

21. A method according to any one of the preceding claims wherein the polyol *moiety of the solid polyol carboxylic acid polyester has from 4 to 8 hydroxyl groups, and the unsaturated carboxylic acid moieties of the solid polyol carboxylic acid polyester have from 12 to 26 carbon atoms, and the saturated carboxylic acid moiety of the solid polyol carboxylic acid polyester has from 20 to 26 carbon atoms.

22. A method according to claim 21 wherein the polyol moiety of the solid polyol carboxylic acid polyester is a sugar. W:ElisabethPJC\WORKI588230P.DOC 47

23. A method according to claim 22 wherein said sugar has from 6 to 8 hydroxyl groups.

24. A method according to any one of the preceding claims wherein the solid polyol carboxylic acid polyester is a sucrose octaester having one oleoc moiety and seven behenic moieties. A method according to claim 24 wherein the molar ratio of the solid non- polymeric gellant to the solid nucleating agent is from 10:1 to 1000:1.

26. A product of the method according to any one of claims 1 to

27. A method for making an anhydrous antiperspirant gel-solid stick composition according to claim 1 substantially as hereinbefore descried with reference to any one of the examples. DATED: 15 June 2001 PHILLIPS ORMONDE FITZPATRICK C C 20 Attorneys for: THE PROCTER GAMBLE COMPANY CS X:Elisabeth\PJCWORK\1588230P.doc