ZA200207805B - Soft solid deodorant and/or antitranspirant care product. - Google Patents

Description

Effective Soft Solid Personal Care Product

Field of the Invention :

This invention relates to soft solid products made as suspensions and suitable for use as antiperspirants and/or deodorants.

Background of the Invention

There is a continuing trend to develop new and superior cosmetic compositions especially for the reduction and/or elimination of wetness and/or odor under the arms.

Particular efforts include developing lower residue products especially with improved efficacy and aesthetics. Various product forms have included sticks (especially gel/sticks), gels, soft solids, roll-ons, aerosols and creams. Of these various forms the sticks, gels, soft solids creams and roll-ons are made with a liquid base material incorporating a solidifying agent and/or gelling agent and/or thickening agent.

Generally, these forms include a solution of the cosmetically active ingredient in a suitable vehicle, a suspension of the active ingredient in a catrier vehicle, or a . multiphasic dispersion or emulsion in which a solution of the active ingredient is dispersed or suspended in some continuous phase or in which the solubilized active ingredient constitutes the continuous phase. )

A variety of soft-solid formulations are known. These include formulations made with the following ingredients: (a) clay thickening agent and an activator for the clay: for example, U.S. Patent

Number 5,019,375 to Tanner et al; and U.S. Patent Number 4,526,780 to Marschner et al; . (b) particulate thickening agents such as fumed silica: for example, U.S. Patent © Number 5,069,897 to Orr; and U. S. Patent Number 4,937,069 to Shin; (c) selected volatile and/or non-volatile alkylmethylsiloxanes such as those including a structuring wax: for example, U.S. Patent Number 5,225,188 to Abrutyn et al; and PCT applications WO 97/16161 and 16162 both of which are assigned to

Unilever PLC; and (d) triglyceride gellants such as the glyceryl tribehenate described in U.S. Patent

Number 5,718,890 to Putnam et al.

The use of a class of compositions known as silicone elastomers in cosmetic compositions has shown some interesting results. PCT case WO 97/44010 and assigned to the same assignee as this application describes a silicone gel material made by combining (a) a volatile silicone material and (b) an organopolysiloxane material (or silicone elastomer) as a gelling agent wherein the organopolysiloxane material (silicone elastomer) can be a reaction product of a vinyl-terminated siloxane polymer and a silicon hydride cross-linking agent. Related technology is also disclosed in PCT case :

WO 98/00097, WO 98/00104 and 98/00105 assigned to Unilever PLC on cross-linked non-emulsifying elastomers.

U.S. Patent 5,599,533 to Stepniewski et al assigned to Estee Lauder describes a stable water-in-oil emulsion system formed with an organopolysiloxane elastomer, a vehicle in which the elastomer is dispersed or dispersible, a stabilizing agent , a surfactant and an aqueous component. A commercial product known as “REVELATION” retexturizing complex for hands and chest sold by the same assignee contains a silicone gel material with an organopolysiloxane component and octamethylcyclotetrasiloxane.

EP 0 787 758 Al teaches a method for solvent thickening by using a silicone latex having a plurality of crosslinked polysiloxane particles.

Another recent case assigned to the same assignee as this application is WO 99/51192 and U.S. Patent Application Serial Number 9/273152 which describes antiperspirant compositions with the use of broad categories of elastomers. Other examples of the use of elastomer type materials and/ or methods for processing such materials may be found in PCT cases WO 98/00097; WO 98/00104; WO 98/00105;

WO 98/18438; WO 98/42307 all of which are incorporated herein by reference.

Two major problems have been observed when the use of elastomer materials is included in soft solid formulations. The first problem is reduction in efficacy due to the formation of an occlusive elastomeric film which prevents the active from diffusing into the sweat duct. The second problem is the consistency of the product as evidenced by high viscosity and elastic behavior when applied to the surface of the skin. In order to reduce this high viscosity, emollients and solvents have to be added which may negatively impact efficacy of the deodorant and/or antiperspirant. It has been found that the use of a selected type of elastomer in soft solid formulations in combination with polyethylene beads as described herein overcomes these problems.

Thus, it is an object of the invention to provide improved cosmetic . compositions with the improvements as previously described and which are useful as antiperspirants and/or deodorants. These and other objects of the invention will be apparent from the following description of the invention.

Summary of the Invention 1t has been found that an improved soft solid cosmetic product may be made as a suspension formed with: (a) a cyclomethicone (and) dimethicone crosspolymer made with an =Si-H containing polysiloxane and an alpha, omega-diene of formula CH,=CH(CH,),CH=CH, » Where x=1-20, to form a gel by crosslinking and addition of =Si-H across double bonds in the alpha, omega diene, which crosspolymer has a viscosity in the range of . 50,000-3,000,000 centipoise (particularly 100,000-1,000,000; more particularly 250,000-450,000 centipoise; and most particularly 350,000 centipoise), preferably with a nonvolatiles content of 8-18% (particularly 10-14% and most particularly 12-13%) in cyclomethicone (for example a D4 or D5 cyclomethicone), (an example of such a crosspolymer composition being DC-9040 from Dow Coming Corporation (Midland,

MI) with other types of such crosspolymers (also called elastomers) being described in

U.S. Patent 5,654,362, incorporated by reference herein as to the description of such : polymers and methods of making such polymers); 3 oo

(b) polyethylene beads having a density in the range of 0.91-0.98 grams/cm’ and a particle size in the range of 5-40 microns, wherein the polyethylene beads are used in an amount of at least 2% by weight based on the total weight of the composition; (c) a volatile silicone; (d) an emollient (or a mixture of two or more emollients) which may include a non-volatile silicone and an additional amount of a volatile silicone; and (€) an effective amount of an antiperspirant active material in an amount : sufficient to have an antiperspirant and/or a deodorant effect.

The soft solid antiperspirant and/or deodorant product of this invention is an opaque product which leaves little or no white residue when applied and which exhibits improved efficacy and stability as compared to other formulations with different types of elastomers. Reduction of sweat of at least 40% can be achieved with the compositions of the invention as compared to typical levels of 15% for other products.

Detailed Description of the Invention

The stable, high efficacy, low residue cosmetic compositions of this invention . are made by combining: (a) 40-75% (particularly 45-60%, and, more particularly, 46-53%) of a volatile silicone (especially a D5 cyclomethicone); (b) 1-20% (particularly 2-18% and, more particularly, 5-15%) of an emollient or a mixture of two or more emollients (for example, 0.1-5% (particularly 0.3-4.0%, more particularly 0.4-2.0% and even more particularly 0.4-1.5%) of a non- volatile silicone such as phenyltrimethicone; or 1-12% C12-15 alkyl benzoate); (c) 0.5-20% (on a solids basis) (particularly 1-15% and more particularly 1-10%) of ) the cyclomethicone (and) dimethicone crosspolymer composition as described above; (d) 0.1-20% (particularly10-20% to get an antiperspirant effect) of an antiperspirant active based on an anhydrous, buffer-free antiperspirant active;

(e) 2-15% (particularly 2-10% and, more particularly, 2-8% ) of polyethylene beads having a particle size in the range of 5-40 microns and a density in the range of 0.91-0.98 g/cm?; ® 0-5% antimicrobial agent; and (g 0-5% fragrance; wherein all percents are in percents by weight based on the total weight of the composition unless otherwise indicated.

The silicone materials used in forming the compositions of the present invention may be selected from the group consisting of conventional cyclic and linear volatile and non-volatile silicones which act as a swelling agent for the suitable elastomer.

Illustratively, and not by way of limitation, the volatile silicones are one or more members selected from the group consisting of cyclic polydimethylsiloxanes such as those represented by Formula I: : CH, [-Si-Ol, :

Cm :

Formula I ] where nis an integer with a value of 3-7, particularly 5-6. By volatile silicone material is meant a material that has a measurable vapor pressure at ambient temperature. For example, DC-245 fluid from Dow Corning Corporation (Midland, Michigan) is a type of cyclomethicone which can be used. These include a tetramer (or octylmethyloyclotetrasiloxane) and a pentamer (or decamethylcyclopentasiloxane).

The nonvolatile and volatile linear silicones are one or more members selected from the group consisting of linear polydimethylsiloxanes such as those represented by Formula

It:

CH, : | CH, - [8-0], - CH, dn,

Formula IT and t is selected so that the molecular weight ranges from 800-260,000 and the viscosity ranges from 5-600,000 centistokes, for example Dimethicone DC 200 from

Dow Corning.

Emollients are a known class of materials in this art, imparting a soothing effect tothe skin. These are ingredients which help to maintain the soft, smooth, and pliable appearance of the skin. Emollients are also known to reduce whitening on the skin and/or improve aesthetics. Examples of chemical classes from which suitable emollients can be found include: (a) fats and oils which are the glyceryl esters of fatty acids, or triglycerides, pormally found in animal and plant tissues, including those which have been hydrogenated to reduce or eliminate unsaturation. Also included are synthetically prepared esters of glycerin and fatty acids. Isolated and purified fatty acids can be esterified with glycerin to yield mono-, di-, and triglycerides. These are relatively pure fats which differ only slightly from the fats and oils found in nature. The general structure may be represented by Formula ITI:

CH,-COOR!

H.COOR? hat -cooe

Formula III wherein each of R', R? and R® may be the same or different and have a carbon chain length (saturated or unsaturated) of 7 to 30. Specific examples include peanut oil, sesame oil, avocado oil, coconut, cocoa butter, almond oil, safflower oil, corn oil, cotton seed oil, castor oil, hydrogenated castor oil, olive oil, jojoba oil, cod liver oil, palm oil, soybean oil, wheat germ oil, linseed oil, and sunflower seed oil; (b) hydrocarbons which are a group of compounds containing only carbon and hydrogen. These are derived from petrochemicals. Their structures can vary widely and include aliphatic, alicyclic and aromatic compounds. Specific examples include paraffin, petrolatum, hydrogenated polyisobutene, and mineral oil.

(c) esters which chemically, are the covalent compounds formed between acids and alcohols. Esters can be formed from almost all acids (carboxylic and inorganic) and any alcohol. Esters here are derived from carboxylic acids and an alcohol. The general structure would be R*CO-OR’. The chain length for R* and R® can vary from 7 to 30 and can be saturated or unsaturated, straight chained or branched.

Specific examples include isopropyl myristate, isopropyl palmitate, isopropyl stearate, isopropyl isostearate, butyl stearate, octyl stearate, hexyl laurate, cetyl stearate, diisopropyl adipate, isodecyl oleate, diisopropyl sebacate, isosteary! lactate, C,,., alkyl benzoates, myreth-3 myristate, dioctyl malate, neopentyl glycol diheptanoate, neopentyl glycol dioctanoate, dipropylene glycol dibenzoate, C,, 5 alcohols lactate, isohexyl decanoate, isohexyl caprate, diethylene glycol dioctanoate, octyl isononanoate, isodecyl octanoate, diethylene glycol diisononanoate, isononyl isononanoate, isostearyl isostearate, behenyl behenate, C , 5 alkyl fumarate, laureth-2 benzoate, propylene glycol isoceteth-3 acetate, propylene glycol ceteth-3 acetate, octyldodecyl myristate, 16 cetyl ricinoleate, myristyl myristate. ) (d) saturated and unsaturated fatty acids which are the carboxylic acids obtained by hydrolysis of animal or vegetable fats and oils. These have general structure R°COOH with the R® group having a carbon chain length between 7 and 30 , straight chain or branched. Specific examples include lauric, myristic, palmitic, stearic, oleic, linoleic and behenic acid. (e) saturated and unsaturated fatty alcohols (including guerbet alcohols) with general structure R’COH where R’ can be straight or branched and have carbon length of 7 to 30. Specific examples include lauryl, myristyl, cetyl, isocetyl, stearyl, isostearyl, oleyl, ricinoleyl and erucyl alcohol; ® lanolin and its derivatives which are a complex esterified mixture of high molecular weight esters of (hydroxylated) fatty acids with aliphatic and alicyclic alcohols and sterols. General structures would include R*CH,-(OCH,CH,),OH where

R® represents the fatty groups derived from lanolin and n=5 to 75 or R°CO-

(OCH, CH,),0H where R’CO- represents the fatty acids derived from lanolin and n=5 to 100. Specific examples include lanolin, lanolin oil, lanolin wax, lanolin alcohols, lanolin fatty acids, isopropyl lanolate, ethoxylated lanolin and acetylated lanolin alcohols. (8) alkoxylated alcohols wherein the alcohol portion is selected from aliphatic alcohols having 2-18 and more particularly 4-18 carbons, and the alkylene portion is selected from the group consisting of ethylene oxide, and propylene oxide having a number of alkylene oxide units from 2-53 and, more particularly, from 2-15.

Specific examples include PPG-14 butyl ether, PPG-53 butyl ether, and PPG-3 myristyl ether. (h) silicones and silanes which are organo-substituted polysiloxanes which are selected from polymers of silicon/oxygen having general structures: (1) (R'),SiO(Si (R'),0),Si(R'?); where R'’, R"' and R'* can be the same or different and are each independently selected from the group consisting of ’ 15 phenyl and C1-C60 alkyl; (2) HOR), SiO(Si (R**),0),Si(R™),0H, where R", R"* and R'® can be the same or different and are each independently selected from the group consisting of phenyl and C1-C60 alkyl; or (3) organo substituted silicon compounds of formula R'’Si(R'*)OSiR" which are not polymeric where R'”, R'® and R" can be the same or different and are each independently selected from the group consisting of phenyl and C1-

C60 alkyl optionally with one or both of the terminal R groups also containing an hydroxyl group. Specific examples include dimethicone (for example, dimethicone having a viscosity of 0.5-1.5 centistokes), dimethiconol behenate,

C,,.45 alkyl methicone, stearoxytrimethylsilane, phenyl! trimethicone and steary] dimethicone. 0) mixtures and blends of two or more of the foregoing. _8-

Emollients of special interest include C12-15 alkyl benzoate (FINSOLV TN from Finetex Inc., Elmwood Park, NJ); phenyltrimethicone, isopropyl myristate; and neopentyl glycol diheptanoate. ~The emollient or emollient mixture or blend thereof incorporated in compositions according to the present invention can, illustratively, be included in amounts of 0.5 - 50 %, preferably 1 - 25 %, more preferably 3 -'12 %, by weight, of : the total weight of the composition.

One particular elastomer of interest is DC-9040 from Dow Corning

Corporation.

The antiperspirant active can be selected from the group consisting of any of the known antiperspirant active materials. These include, by way of example (and not of a limiting nature), aluminum chlorohydrate, aluminum chloride, aluminum sesquichlorohydrate, zirconyl hydroxychloride, aluminum-zirconium glycine complex (for example, aluminum zirconium trichlorohydrex gly, aluminum zirconium pentachlorohydrex gly, aluminum zirconium tetrachlorohydrex gly and aluminum : zirconium octochlorohydrex gly), aluminum chlorohydrex PG, aluminum chlorohydrex

PEG, aluminum dichlorohydrex PG, and aluminum dichlorohydrex PEG. The aluminum-containing materials can be commonly referred to as antiperspirant active aluminum salts. Generally, the foregoing metal antiperspirant active materials are antiperspirant active metal salts. In the embodiments which are antiperspirant compositions according to the present invention, such compositions need not include aluminum-containing metal salts, and can include other antiperspirant active materials, including other antiperspirant active metal salts. Generally, Category I active antiperspirant ingredients listed in the Food and Drug Administration's Monograph on antiperspirant drugs for over-the-counter human use can be used. In addition, any new drug, not listed in the Monograph, such as aluminum nitratohydrate and its combination with zirconyl hydroxychlorides and nitrides, or aluminum-stannous chlorohydrates, can : -0- oo be incorporated as an antiperspirant active ingredient in antiperspirant compositions according to the present invention.

Particular types of antiperspirant actives include aluminum zirconium trichlorohydrex and aluminum zirconium tetrachlorohydrex either with or without glycine. A particular antiperspirant active is aluminum trichlorohydrex gly such as

AZ7-902 SUF (from Reheis Inc., Berkley Heights, NJ); Westchlor 30BDM XF (from

Westwood Chemical Co., Middletown, NY). Particular tetrachlorohydrex salts include

AZP 902 SUF from Reheis and Westchlor 35BDM XF from Westwood. Any of these salts can be processed to obtain 98% of the particles less than 10 microns in size; 95% of the particles less than 10 microns in size; 90% of the particles less than 10 microns in size; or 85% of the particles less than 10 microns in size.

Antiperspirant actives can be incorporated into compositions according to the present invention in amounts in the range of 0.1 — 25% of the final composition, but the amount used will depend on the formulation of the composition. For example, at amounts in the lower end of the broader range (for example, 0.1 - 10% on an actives basis), a deodorant effect may be observed. At lower levels the antiperspirant active material will not substantially reduce the flow of perspiration, but will reduce malodor, - for example, by acting as an antimicrobial material. At amounts of 10-25% (on an actives basis) such as 15 - 25%, by weight, of the total weight of the composition, an antiperspirant effect may be observed.

The antiperspirant active material is desirably included as particulate matter suspended in the composition of the present invention in amounts as described above, but can also be added as solutions or added directly to the mixture.

The polyethylene beads useful with this invention have a density in the range of 0.91-0.98 g/cm? and a particle size in the range of 5-40 microns, with one particular type of polyethylene having a particle size of 20 microns. All particle sizes are averages. Several types of suitable polyethylene beads that are commercially available are MICROTHENE FN 510 from Equistar Chemicals LP (Houston, Texas); ACUMIST

Claims (9)

1. Claims We Claim: 1 A low residue antiperspirant and/or deodorant compositions comprising: (a) 40-75% of a volatile silicone; (b) 1-20% of an emollient which may be a single emollient or a mixture of emollients; (© 0.5-20% on a solids basis a cyclomethicone (and) dimethicone crosspolymer

   10 . made with an =Si-H containing polysiloxane and an alpha, omega-diene of + formula CH,=CH(CH,),CH=CH, , where x=1-20, to form a gel by crosslinking and addition of =Si-H across double bonds in the alpha, omega diene, which crosspolymer has a viscosity in the range of 50,000-3,000,000 centipoise and a nonvolatiles content of 8-18% in cyclomethicone; (d) 0.1-20% of an antiperspirant active based on an anhydrous, buffer-free basis; (e) 2-15% of polyethylene beads having a particle size in the range of 5-40 microns } and a density in the range of 0.91-0.98 g/cm’; (© 0-5% antimicrobial agent; and (® 0-5% fragrance; wherein all percents are in percents by weight based on the total weight of the composition unless otherwise indicated.
2. 2. An antiperspirant and/or deodorant composition according to Claim 1 comprising 45-60% of a volatile silicone. -25 Co :
3. 3. An antiperspirant and/or deodorant composition according to Claim 1 or 2 wherein the volatile silicone is cyclomethicone. :
4. 4. An antiperspirant and/or deodorant composition according to Claim 1 comprising 2-18% of an emollient wherein thé emollient comprises one or more members selected from the group consisting of (a) fats and oils which are the glyceryl esters of fatty acids or triglycerides of Formula III: CH,-COOR!

   : H.COOR? be, -coor? Formula III wherein each of R', R?, and R® may be the same or different and have a carbon chain length (saturated or unsaturated) of 7 to 30; (b) hydrocarbons; (c) esters of formula R*CO-OR?® , wherein the chain length for each of R* and R® is from 7 to 30 and can be saturated or unsaturated, straight chained or branched; (d) saturated and unsaturated fatty acids having a formula R°COOH wherein R® has a carbon chain between 7-30 and can be straight or branched chain; . (e) saturated and unsaturated fatty alcohols having a formula R’COH wherein R’ has a carbon chain between 7-30 and can be straight or branched chain; (f) lanolin and its derivatives; (g) alkoxyated alcohols wherein the alcohol portion is selected from aliphatic alcohols having 2-18 and more particularly 4-18 carbons, and the alkylene portion is selected from the group consisting of ethylene oxide, and propylene oxide having a number of alkylene oxide units from 2-53; (h) silicones and silanes which are members of the group consisting of polymers of sificon/osygen having general structures:

   (1) R19),Si0(Si R'),0),Si(R'?), where R'%, R'" and R'? can be the same or different and are each independently selected from the group consisting of phenyl and C1-C60 alkyl; (2) HOR),Si0(Si R™),0),Si(R'*),0H, where R'", R'"* and R'® can be the same or different and are each independently selected from the group consisting of phenyl and C1-C60 alkyl; or (3) organo substituted silicon compounds of formula R'’Si(R")OSiR which are not polymeric where R', R'® and R'"” can be the same or different and are each independently selected from the group consisting of phenyl and C1- C60 alkyl optionally with one or both of the terminal R groups also containing © an hydroxyl! group; and (i) mixtures and blends of two or more of (a)-(h).
5. 5. An antiperspirant and/or deodorant composition according to Claim 4 wherein the emollient is one or more members selected from the group consisting of dimethicone, dimethiconol behenate, Cs, ,s alkyl methicone, stearoxytrimethylsilane, phenyl trimethicone and stearyl dimethicone.
6. 6. An antiperspirant and/or deodorant composition according to Claim 1 comprising 1-15% of the cyclomethicone (and) dimethicone crosspolymer.
7. 7. An antiperspirant and/or deodorant composition according to Claim 1 : comprising 10-20% of an antiperspirant active.
8. 8. An antiperspirant and/or deodorant composition according to Claim 1 comprising particularly 2-10% of polyethylene beads.
9. 9. An antiperspirant/deodorant composition according to Claim 1 which is made as a soft solid and which comprises: (a) 1-20% of cyclomethicone; " (b) 1-20% of an emollient component comprising 1-8% of C12-15 alkyl benzoate; 0.5- 5% neopentyl glycol diheptanoate; 0.5-2% isopropyl myristate; 0.4-1.5% of phenyltrimethicone; (c) 40-60% cyclomethicone (and) dimethicone crosspolymer in cyclomethicone; (d) 15-25% antiperspirant active; (e) 3-10% polyethylene beads; and (f) optionally 0.5-1.5% fragrance.