CA1140471A - Antiperspirant stick containing starch - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE
An antiperspirant stick composition that exhibits essentially no oily feel; the composition contains active antiperspirant materials, emollient oil and from about 1% to about 50% by weight of a starch and preferably from about 5% to about 35% by weight of said starch, the preferred starch being aluminum starch oetenylsuccinate.

Description

:114~9L71 ANTIPERSPIR~NT STICK CONTAINING STARCH

This invention relates to an antiperspirant stick composition. More particularly, it concerns antiperspirant stick composition that essentially eliminates the oily feel characteristics of such sticks.
The stick antiperspirants currently being marketed contain around 25% of antiperspirant active ingredients and the balance being waxes, oils and surfactants. The "actives" are generally either aluminum hydroxychloride or aluminum zirconium complexes and are solid powders suspended in the wax/oil matrix. Because o the large amount of oily components~ the sticks feel greasy and oily.
It has now been found that by incorporating a starch into the antiperspirant stick along with the "actives"
this greasy, oily feel can be eliminated. In addition, the starch gives the stick a silky feel. By incorporating the starch an equal amount of oil can be removed. Since the starch does not absorb oils or water, there is rela-tively little bulking of the stick during the molten stages before pouring.
It is accordingly an object of the present invention to provide an antiperspirant stick composition which does not exhibit an oily ~eel.
It is a further object o~ this invention to provide an antiperspirant stick which does not have an oily or greasy feel and yet feels smooth when applied.
Other and more detailed objects of this invention will be apparent from the following description and claims.
In the following description and claims, unless other-wise indicated, all percentages axe given in terms of percent by weight based on the total weight of the stick composition.

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~4~4~1 Any of a variety of natural starches or modiied starches (hereinafter referred collectively by the term starch) may be employed in formulating the stick antiper-~pirants of the present in~ention. By way of example, mention may be made of corn starch, rice starch, etc. ~~
In a preferred form of this invention, a modified starch known as aluminum starch ~tenylsuccinate is em~loyed. ~his is the aluminum salt of the reaction product of octenylsuccinic anhydride and starch~ A product of this character is sold on the market under the name DRY FLO (National Starch).
The quantities of starch that will be contained in the composition of this invention will vary somewhat.
Generally, it will cons~itute between about 1% to about 50 of the stick, with the preferred range being from about 5% to about 35%~
The antiperspirant sticks of this invention will also contain a quantity of oil which may serve as an emol-lient. Typical emollients that are use~ul for the present purposes include non-polar liguids which will ordinarily take the ~orm of a non-volatile oil. Suitable non-volatile oils for this purpose axe organic oily liquids which are non-polar in character and have (a) boiling point under atmospheric pressure not lower than about 120C; (b) a specific gravity between about 0.7 and 1.6 preferably between

2~ 0.7 and 12. These include such materials as liquid hydro-carbon (minera~ o11); fatty acid esters tisopropyl myristate, isopropyl palmitate), branched chain fatty acid esters (2-ethyl hexyl palmitate) diesters of dicarboxylic acids (diisopropyl adipate), dibutyl phthalate; polyoxy alkylene glycol esters (polypropylene glycol 2000 monoole~te);
propylene glycol diesters of short chain fatty acids (C8 -C10) (Neobee M20), polyoxyethylene ethers (polyoxyethylene(~) lauryl ether (Brij 30), polyoxyethylene fatty acids, poly-oxypropylene cetyl ether (procetyl); higher fatty alcohols (oleyl, hexadecyl, lauryl); Silicone Oils (dimethyl poly-siloxane, 10-1000 centistokes); Volatile Silicones (e.g.
*Trademark 1 ~ . , .

Cyclomethicone 251). Mixture~ of the about non-polar liquids are equally suitable for the purpose oX this in~en-tion.
Since the starch can be used to replace the oil, the quantity of oil present will vary in some inverse relation-ship with respect to the starch i.e. the greater the amount of oil, the less the starch and vica versa. Usually, however, the oil will comprise from about 20.0 % to about 70.0 % of the composition with the preferred range being from about 25.0% to about 45.0 %.
The principal active ingredient in the antiperspirant stick composition o this invention is, of course, the antiperspirant material. This will ordinarily take the form o~ an astringent aluminum or zirconium compound or mixtures thereof; that is, mixtures of alumin~m compounds or mixtures of zirconium compounds or mixtures of aluminum compounds with zirconium compounds. Vsually, the aluminum or zirconium compounds will take the form of astringent salts. Typical antiperspirant actives include impalpable aluminum chlorhydroxide and aluminum hydroxybromide, aluminum chloride as well as the aluminum/zirconium/glycine anti-perspirant complexes disclosed in U.S. Patent No. 3,792,068 issued ~ebru~ry 12, 1~74 to Luedders et al.
The preferred aluminum compound for preparation of the Luedders et al complex is aluminum chlorhydroxide of the formula A12(OH)5C12H2O. The preferred zirconium compound for preparation of the Luedders et al complex is æirconyl hydroxychloride having the formula ZrO(OH)C13H2O. The preferred amino acid for preparing the Luedders et al complex is glycine of the formula CH2(NH2)COOH. Salts of such amino acids can also be employ~d in such antiperspirant complexes.
Other suitable actives for use in the present invention comprise mixtures of aluminum chloride with othex aluminum salts less acidic than aluminum chloride e.g. alumin~

;) '7~

hydroxychloride (or aluminum chlorhydroxide). These are described i~ Canadian Patent 958,338 issued November 26, 1974.
The active antiperspirant material is generally present in the stick in powdered form suspended in the stick matrix. An antiperspirant active amount of this material will be employed. Ordinarily, this will consti-tute between about 10.0~ and about 50.0% of the stick with the pre~erred range being between about 15.0% and 35.0~.
The backbone of the antiperspirant sticks of the present invention will generally comprise a low melting point waxy material that is a waxy material having a melting point o~ from about 100F to 150F. Typical suitable low melting point waxes are fatty acids containing from about 8 to about 22 carbon atoms, fatty alcohols containiny from about 8 to about 22 carbon atoms, silicone waxes and glycerol monostearate. Especially useful materials of this type are the C8 to C22 fatty acids and C8 to C22 fatty alcohols. By way of example, the following may be mentioned:
cetyl alcohol, stearyl alcohol, myristyl alcohol, Lauryl alcohol and Behenyl alcohol. However, the preferred low melting point wax is stearyl alcohol.
The quantity of low melt:ing point wax that may be contained in the present antiperspirant stick compositions may also vary somewhat. Ordinarily, this will comprise about 1.0 % to about 30.0~ by weight based on the total weight o the composition and preferably about 5.0 by weight.
The low melting point wax may be replaced in whole or in part by a high melting point wax. Suitable waxes are water-insoluble waxes having a melting point of from about 150F to about 215F. Examples o~ suitable waxes are beeswax, spermaceti, carnauba, bayberry, candelilla, montan, ozokerite, ceresin, paraffin, synthetic waxes such ..

t71 as Fischer-Tropsh waxes,and microcrystalline wax. The present compositions may contain from about 1.0% to about 15.0 ~ of this wax. The preferred a~ount of high melting point wax is from about 3.0 ~ to about 10.0 %.
It is also advantageous to incorporate a surfactant in the antiperspirant stick composition of this invention.
This facilitates better contact between the antiperspirant material and the skin and helps to increase its activity.
Moreover, it also facilitates the removal of the product while washing or bathing. A number of sur~actants are known in the prior art which are suitable for the present purposes.
By way of example, mention may be made of the following:
*
Sorbitan fatty esters (Arlacel 20), Polyoxyethylene sorbitol lanolin derivatives (Atl~s G 1471), Polyoxyethylene lanolin deriv*ative (Atlas G-1795), Polyoxyethylene fatty ethers (Brij 35), Polyoxyethylene 25 propylene*glycol stearate (G-2162), Polyoxyethylene stearate tMyri 59), P~lyoxy~
ethylene sorbitan fatty ethers (Tween 20), Polyoxypropylene polyoxyethylene condensate (Pluronic F-127).
The quantity of surfactant that will be contained in the present composition may vary over a range. Generally, it will contain from about 1.0 ~ to about 20.0 % by weight based on the total weight of the composition and preferably about 5.0 % by weight.
The antiperspirant stick compositions of this inven-tion may also contain other ingredients commonly employed in other antiperspirant sticks or other forms o~ antiper-spirant compositions. Thus, anti-staining agents, suspending agents, gelling agentsr fillers, stabilizing agents, antioxidants, pigments, coloring agents, perfumes, preservatives, anti-bacterial agents, etc. may also con stitute part of the present sticks.
In preparing the compositions of the present inven-tion, the oil, waxes and other relatively low melting materials * Trademark are mixed together and heated until this mass is liquid.
The powdered active antiperspirant material and the starch are then thoroughly blended with the liquid. The perfume is then added and the mlxture is then poured into stick molds and allowed to cool.
The following Examples are given to furthex illus-trate the present invention. It is understood, however, that the invention is not limited thereto.
The following terms used in the specification and Examples have the meaning ascribed to them below:

WIKENOL 369 - Aluminum-Zirconium Tetrachlorohydrate Glycine Complex Al 15.0% ; Cl 17.8% ; Glycine 10%
DRY ~LO STARCH - A modified starch known as Aluminum Starch Octenylsuccinate which is the reaction product of o~tenyl~uccinic anhydride and starch.
PROCETYL AWS - Alkoxylated derivative of cetyl alcohol P.P.G. 5 Cetheth 20 SILICONE 251 - Volatile Silicone which is a mixture of low M.W. cyclomethicones 85% Tetramer D-4 ;
15% Pentamer D-5 FT-300 WAX - A paraffin wax with a melting point of 230F
G-2162 EMULSIPIER - Polyoxyethylene(25)Propylene Glycol Stearate IONOL C.P. - Butylated Hydroxytoluene SILICONE 2158 - Cyclomethicone, predominately Pentamer D-5 *
Az4 (MICRODRY) - Aluminum-Zirconium Trichlorohydrate TradeTnark ':.

~ by Wt.
(1) Montan Wax ~SW 4.
(2) Dibutyl phthalate 32.

(3) Wikenol 369 22.

(4) DR~ FLO Starch 32.

(5) Procetyl AWS 4.

(6) Silicone 251 5.

(7) Perume 1.

Ingredients 1, 2 t 5 and 6 are thoroughly mixed . together and heated to about 160F to form a fluid melt.
Ingredients 3 and 4 are then blended into the fluid melt to make a homogeneous mixture. The perfume (ingredient 7) is then added and.the mixture is poured into stick molds and allowed to cool~

% by Wt.
Stearyl alcohol 21 FT-300 Wax 2 G-2162 emulsifier 2 Ionol C.P. 0.05 Silicone 7158 41.55 i2 0.40 Az4 (MICRODRY) 22 D~Y FLO Starch 10 Perfume 7~1L

The procedure similar to that given in ~xample 1 is used in ~ormulating the stick.
Although the invention has been described with reerence to specific forms thereof, it will be understood that many changes and modifications may be made without departing from the spirit of this invention.

Claims (5)

1. WHAT IS CLAIMED IS:
   L. An antiperspirant stick composition comprising:
   (a) an antiperspirant effective amount of an active antiperspirant material;
   (b) emollient oil; and (c) from 1% to about 50% by weight based on the total weight of the stick composition of a starch, the relative amounts of oil and starch in said composition being such that it exhibits essentially no oily feel.
2. 2. A composition according to Claim 1 in which the active antiperspirant material is present in the form of solid particulate matter suspended in the stick.
3. 3. A composition according to Claim 2 in which said active antiperspirant material takes the form of an astringent aluminum or zirconium compound or complex or mixtures thereof.
4. 4. A composition according to Claim 3 in which:
   (a) said antiperspirant: material is present in the range of from about 10-0% to about 50-0 % by weight based on the total weight of the composition;
   (b) said starch is present in the range of from about 5% to about 35% by weight based on the total weight of the composition; and (c) said emollient oil is present in the range of from about 20.0% to about 70.0 % by weight based on the total weight of the composition.
5. 5. A composition according to Claim 4 in which said starch is aluminum starch octenylsuccinate.