MXPA99004048A - Antiperspirant composition - Google Patents

Abstract

An antiperspirant stick composition suitable for topical application to human skin, comprising:i) an effective amount of an antiperspirant astringent;ii) a volatile silicone;iii) a structurant;and iv) a cross-linked or partially cross-linked non-emulsifying siloxane elastomer.

Description

ANTITRANSPIRANT COMPOSITION DESCRIPTION OF THE INVENTION The present invention relates to antimicrobial compositions suitable for topical application to human skin, particularly solid compositions suitable for use as a cosmetic stick together with a stick support. The market for deodorants and anti-stress products is dominated by products based on aluminum or zirconium saines, which are intended to prevent or at least control perspiration on the surfaces of the skin, particularly in the area of The axiia, while by regular io simultaneously provide a perceived degree of sodor elderly. Various physical forms of antiperspirant compositions are known, for example, in aerosol, lotion or solid form. When the antiperspirant is provided as a solid composition for use in the "bar" form, it is known to incorporate the active components, which may be present in the composition, such as, for example, the aluminum or zirconium salt and the others components of the composition, in a cosmetically acceptable vehicle comprising enormously silicone oils (either volatile or non-volatile), a matrix of long chain fatty alcohols, which act as a structuring agent. For example, in the U.S. Patent. 4, 126, 679 (Armor-Di al) describes the possibility of making solid-bar antistress compositions comprising powdered astringent metal salts, suspended in a matrix comprising volatile silicone oil, and from 15 to 75% of alcohols selected from aliphatic alcoaols insoluble in long chain water having from 16 to 22 carbon atoms in the chain. EP-B-117, 070 (Procter &Gamble) describes an antiperspirant composition in solid bar form, comprising from 5 to 20% of a long chain fatty alcohol having from 8 to 18 carbon atoms in its chain, 35 to 55% of a volatile polydimethyl silicone, 10 to 70% of an astringent antiperspirant salt, and 1 to 3% by weight of the total long chain fatty alcohol level of the composition of an additional long chain fatty alcohol selected of fatty alcohols of 20 to 26 carbon atoms, or mixtures thereof. A problem with existing solid stick formulations in general is the poor sensory properties as described by the user. Typically, the bars are perceived as being wet and / or greasy. The wet or oily sensation may be the result of silicon oil fiitration outside the matrix, with a subsequent loss of beneficial properties. It is already known that, generally speaking, silicone oils and long chain fatty alcohols in solid form are not compatible, the long chain alcohol tending to "compress" the silicone oils out of the matrix. According to the invention, there is provided an antiperspirant composition in the form of a stick suitable for topical application to the skin of the human being, comprising: i. an effective amount of an antiperspirant astringent; ii. a volatile silicone; iii. a structuring; and iv. a cross-linked or partially crosslinked non-emulsified siloxane elastomer.

The reticulated or partially reticulated non-emulsified siioxane elastomer comprises 0. 1 to 20% of the composition, preferably from 0.1 to 10% and more preferably from 0.1 to 5% of the composition according to the invention. Preferably, the crosslinked siloxane elastomer is formed from the hydroxylation of vinyl silicone fluids through hydroxy esters or MQ hydride fluids. More preferably the non-emulsified siloxane elastomer is a dimethicone / vinyl dimethicone cross-linked polymer. Conveniently, the antiperspirant astringent comprises 1-35% by weight of the composition. More preferably, the antiperspirant astringent comprises 5-30% of the composition. The structuring, which preferably is an aliphatic alcohol insoluble in long chain water, comprising up to 40% of the composition. Fatty alcohols suitable for use as a structure are those having about 12-22 carbon atoms. The volatile silicone is preferably a volatile linear or cyclic silicone comprising from 3 to 9 and preferably from 4-6 silicon atoms. The volatile silicone comprises from 1 to 85% and preferably from 5-70% of the composition. In a preferred embodiment, the invention provides an antiperspirant composition suitable for topical application to human skin comprising: i. 15-25% by weight of the total composition of an antiperspirant astringent; ii. 50-60% by weight of the total composition of a volatile linear or cyclic silicone; iii. 5 to 30% by weight of the total composition of long-chain water-insoluble aliphatic alcohols having 16-22 carbon atoms in the chain; iv. from 0.1 to 20% by weight of a cross-linked polymer elastomer of vini ldime t i cona / dime t icona. Surprisingly it has been found that through the use of crosslinked or partially crosslinked non-emulsified siloxane elastomers in combination with a volatile silicone, it is possible to produce an antiperspirant stick composition, which has improved and attractive cosmetic characteristics which are expected from said bars. A parameter that has to be very tightly controlled with the bar-shaped formulations is the hardness of the bar, it is important not only because it determines the storage properties of the bar, in particular the resistance of the bar to the degradation caused by temperatures extreme, but also because it determines the deposition of the antiperspirant composition that occurs when the bar is used for a given application stroke. Viewed against the prior art mentioned above, it has been found that cosmetic bars with desirable hardness, costs and skin feel can be made using siloxane elastomers as defined in combination. with fatty alcohols. The compositions according to the invention not only have useful hardness properties at room temperature, but also allow the antiperspirant composition to be easily formulated. It has also been found that bar formulations according to the invention tend to show a reduced tendency towards "flaking" and have an improved dry non-greasy feel, compared to other anti-transplants formulations where the vehicle comprises , for example, volatile silicone in the absence of an elastomer. An improved armpit bar can be obtained through the incorporation of a crosslinked or partially crosslinked non-emulsified siloxane elastomer in combination with an oily material, preferably a volatile silicone in the bar. A major advantage of the composition is when the elastomer swells in the volatile silicone (for example, cyclic ticone), the resulting material (hereinafter referred to as the "gel") prevents the filtration of the volatile silicone, which can result in as a result in a greasy feeling. In addition, the elastomer thickens to the cyclic ticone. The aesthetics of the resultant bar product is superior to that of the known products.The siloxane elastomers are polymer networks with crosslinked or partially crosslinked entangled tangles, preferably made through the reaction catalyzed by known Pt. as a hydroxy 1 ation of vinyl silicon fluid either through hydr oxy fluids or highly qualified MQ hydride fluids The control of the tektometry and the type of the vinyl silicon fluid and the silane crosslinker control the properties of Cured networks Additional vinyl reagents such as vinyl alkene can be introduced into the reagent medium to further modify the silicone network The selection of the reaction solvent is also a means to modify the properties of the resulting gels in a certain amount, that can be easily controlled, and is trapped in the polymer network giving different properties such as The average molecular weight of silicone elastomers is between 10,000 and 40 million and preferably between 10,000 and 20 ml 1 lone s. Typically, the cross-linked siloxane polymer networks swell substantially through oily materials, preferably silicone fluids such as silicone and / or dimethicone, to form gels, the characteristics of the gel depending on the degree of entanglement. The resulting gels are not weakened by normal shear stress (e.g., at 2000 rpm), heating or flotation on the skin and contain 0.1 and 50% of the crosslinked silicone polymer network, i.e., the elastomer.

Illustrative examples of gels are materials with the CTFA name of crosslinked polymer of cyclohexone / dimetho cona / vini 1 dimethicone containing about 0.1 to 50%, preferably 1 to 20% and more preferably 1 to 8% of the polymer crosslinked dime ti cona / vini 1 dimethicone (elastomer) and known as KSG-15 ex Shin-Etsu. Other suitable cross-linked siloxane elastomers and gels are also available from Witco Corporation, Dow Corning and General Electric. The composition according to the invention comprises an antiperspirant astringent. Examples of suitable astringents include aluminum salts, zirconium salts, aluminum and / or zirconium complexes, for example aluminum halides, hydroxy aluminum halides, zirconium oxides, zirconium hydroxyhalides, and mixtures thereof. same. Useful zirconium salts include zirconium hydroxide and zirconium oxychloride. Other astringents generally used will be known to those skilled in the art. Preferred astringents include AAZG (Aluminum-Zirconium-Activated Glycine), ZAG (C i rconium-Aluminum-Glycine), and AACH (Activated Aluminum Clohydrate).

Examples of suitable volatile silicones include polydimethyl silicic acid, which have a viscosity of less than 10mm.sup.2, examples of which are DOW CORNING 344 and 244 fluids (tetramers) and DOW CORNING fluids 245 and 345 (pentamer). Other suitable silicones include hexa eti 1 di si loxane having a viscosity not greater than 0.65mm2s_1, for example the DOW CORNING 200 fluid, which has a viscosity of 0.65mm2s_1 as determined according to a method provided in the data sheets provided by the manufacturer with respect to these comps st. The preferred volatile silicones are the cyclic forms. The composition according to the invention may optionally comprise other ingredients, in addition to those already identified, depending on the nature and form of the finished product. Examples of other ingredients, which may optionally be present in the composition according to the invention, include: emollients, such as non-volatile silicones, hydrocarbons or mineral oils; non-volatile silicones including po 1 idime t i 1 s i 1 oxano having a viscosity in an excess of 5mm s ~, for example 50 to lOOOmm s, such as the DOW CORNING 200 fluids (standard viscosities of 50 - 100mm2s_1). Other emollients include PEG 400 distearate, and condensation products of ethylene oxide and / or propylene oxide having the following formula: RO (C2H40) a (C3H60) bH wherein R is either hydrogen or a hydrocarbon chain having from about 2 to carbon atoms, and a_ and b_ each are from about 0 to 35, and a_ + b is from about 5 to 35. An example of said emollient is Fluid AP or Ethylflo, a condensate of about 14 moles of propylenic acid with about 1 mole of butyl alcohol sold by Union Carbide; still other emollients suitable for use in the solid stick compositions herein include esters of fatty acid and fatty alcohol and water insoluble ethers; thickeners, such as clays, for example Bentona 38, silica, for example Aerosil 200; skin feeling improvers, such as talcum and finely divided polyethylene, an example of which is ACUMIST B18; cosmetically acceptable vehicles, such as anhydrous ethanol and other emollients; perfumes; conservatives; and other conventionally associated cosmetics used in deodorant products in the form of stick. A preferred optional component includes a wax such as castor wax, Synchrowax HRC, Carnaubau, beeswax, silicone waxes and glycerol monoethers and mixtures thereof, at levels of about 1 to 10%, preferably 2%. to 8%. If present, it is believed that the wax improves the structural ability of the composition in the molten state. The ingredients that optionally may be present in the composition may conveniently form the remainder of the composition. The composition according to the invention can take the form of a solid product suitable for or adapted for topical application to the skin of the human being. A convenient form of the composition according to the invention is a solid stick, usually contained in a suitable support or spout to allow it to be applied to the skin area, particularly the underarm area where transpiration and deodorance control is required. The invention also provides the use of an anti-oxidant composition in the form of a solid stick, according to the invention, as defined herein for the control of perspiration, after topical application to the skin of the human being.

EXAMPLES The invention is further illustrated through the following examples: COMPARATIVE EXAMPLE: % by weight Volatile Silicone (DC345) 52.80 AZAG (Active) 24.00 Stearic Alcohol 14.00 Isopropyl Myristate 1.00 Fr aganc i a 1.00 Talc 3.20 Castor wax MP80 4.00 Ceno polymer 100.00 Elastomer content 0.0 Total The bar was prepared according to conventional known techniques. For example, the volatile silicone, stearyl alcohol and castor wax were melted together in a vessel at a temperature of 65-80 ° C with stirring. Other ingredients (for example, talcum, emollients and preservatives) were added slowly with agitation, and subsequently the AAZG was added slowly with stirring, the temperature of the vessel while the AAZG was added was maintained at about 65 ° C. Finally, the perfume was added to the composition with agitation. The molten composition could then be cast into bars of the desired shape and cooled. The resulting bar had a slightly moist, greasy, greasy feel.

EXAMPLE 1 This example illustrates an antiperspirant stick product according to the invention. The bar had the following formulation: by weight Volatile Silicone (DC344) 27.80 GE Gel 25.00 AZAG (Active) 24.00 Stearilic Alcohol 14.00 Isopropyl Myristate 1.00 Fr aganci a 1.00 Talc- 3.20 Castor wax MP80 4.00 Po 1 i ceno 100.00 Elastomer Content 1.25 Total The bar was prepared in accordance with. the same method as in Example 1, except that the gel was added with the talc, emollient and preservatives. A bar according to the above composition obtained a satisfactory feeling of dryness during use, and acceptable storage conditions.

EXAMPLE 2 An antiperspirant stick having the following formulation was prepared: % by weight Volatile Silicone (DC344) 40.30 GE Gel 12.50 AZAG (Active) 24.00 Stearilic Alcohol 14.00 Isopropyl Myristate 1.00 Fragrance at 1.00 Talc 3.20 Castor wax MP80 4.00 Poly decene 100.00 Elastomer Content 0.625 Total The bar was prepared according to Example 1. The resulting bar had a dry and hard feel.

EXAMPLE 3 An antiperspirant was prepared having the following formulation: % by weight Volatile Silicone (DC344) 26.30 GE Gel 12.50 AZAG (Active) 24.00 Stearilic Alcohol 14.00 Isopropyl Myristate 1.00 Fr aganci a 1.00 Talc 3.20 Castor wax MP80 4.00 Poly decene 14.00 100.00 Elastomer Content 0.625 Total The bar was prepared according to Example 1. The resulting bar had a silky / soft feel, was less greasy than the comparative example and had fewer visible deposits. The bar was also easily rubbed, therefore, the addition of polydecene also improved the cosmetic properties.

Claims (8)

1. A nitrile antiperspirant composition suitable for topical application to human skin, comprising: i. an effective amount of an antiperspirant astringent; ii. a volatile silicone; iii. a structuring; and iv. a cross-linked or partially crosslinked non-emulsified siloxane elastomer.

2. The composition according to claim 1, wherein the cross-linked siloxane elastomer is formed from the hydroxy-1-acyone of vinyl silicone fluids through hydrous loxane or MQ hydride fluids.

3. The composition according to claim 2, characterized in that the elastomer is a cross-polymer of dime t i cona / vini 1 dime t i -cona.

4. The antiperspirant composition according to any of claims 1 to 3, wherein the antiperspirant astringent comprises 5-30% by weight of the composition.

5. The antiperspirant stick composition according to any one of claims 1 to claim 4, further comprises a non-volatile emollient.

6. The antiperspirant stick composition according to claim 5, wherein the non-volatile emollient is a hydrocarbon.

7. An antiperspirant composition suitable for topical application to human skin, comprising: i. 15-25% by weight of the total composition of an antiperspirant astringent; ii. 50-60% by weight of the total composition of a volatile linear or cyclic silicone; iii.5 to 30% by weight of the total composition of long-chain water-insoluble aliphatic alcohols having 16-22-carbon atoms in the chain; and iv. from 0.1 to 20% by weight of a vinyl cross-linked polymer elastomer Idime t i cona / dime t i cona.

8. The use of a crosslinked or partially crosslinked elastomer in the manufacture of an antiperspirant stick containing volatile silicone to prevent filtration of the silicone.