GB2076290A - Antiperspirant stick containing starch - Google Patents

Abstract

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

Description

SPECIFICATION Antiperspirant stick containing starch This invention relates to an antiperspirant stick composition. More particularly, it concerns an antiperspirant stick composition that essentially eliminates the oily feel characteristic of such sticks.

The stick antiperspirants currently being marketed contain around 25% of antiperspirant active ingredients, or 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 of 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 relatively little bulking of the stick during the molten stages before pouring.

It is accodingly an object of the present invention to provide an antiperspirant stick composition which does not exhibit an oily feel.

It is a further object of 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 otherwise indicated, all percentages are given in terms of percent by weight based on the total weight of the stick composition.

Any of a variety of natural starches or modified starches (hereinafter referred collectively by the term starch) may be employed in formulating the stick antiperspirants of the present invention. 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 octenylsuccinate is employed. This 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 constitute 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 emolient. Typical emollients that are useful for the present purposes include non-polar liquids which will ordinarily take the form of a non-volatile oil. Suitable non-volatile oils for this purpose are organic oily liquids which are non-polar in character and have (a) boiling point under atmospheric pressure not lower than about 1 20to; (b) specific gravity between about 0.7 and 1.6 preferably between about 0.7 and 12.These include such materials as liquid hydrocarbon (mineral oil); fatty acid esters (isopropyl 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 monooleate); propylene glycol diesters of short chain fatty acids (C8-C1 0) (Neobee M20); polyoxyethylene fatty acids, polyoxypropylene cetyl ether (procetyl); higher fatty alcohols (oleyl, hexadecyl, lauryl); Silicone Oils (dimethyl polysiloxane, 10-1000 centistokes); Volatile Silicones (e.g. Cyclomethicone 251). Mixtures of the about non-polar liquids are equally suitable for the purpose of this invention.

Since the starch can be used to replace the oil, the quantity of oil present will vary in some inverse relationship with respect to the starch i.e. the greater the amount of oil, the less the starch and vice 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 of this invention is, of course, the antiperspirant material. This will ordinarily take the form of an astringent aluminum or zirconium compound or mixtures thereof; that is, mixtures of aluminum compounds or mixtures of zirconium compounds or mixtures of aluminum compounds with zirconium compounds. Usually, 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 chloride as well as the aluminum/ zirconium/glycine anti-perspirant complexes disclosed in Patent No. 3,792,068 issued February 12, 1974 to Luedders et al.

The preferred aluminum compound for preparation of the Luedders et al complex is aluminum chlorhydroxide of the formula Al 2(OH)5C1 2H20. The preferred zirconium compound for prepartion of the Luedders et al complex is zirconyl hydroxychloride having the formula ZrO(OH) Cl 3H2O. 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 employed in such antiperspirant complexes.

Other suitable actives for use in the present invention comprise mixtures of aluminum chloride with other aluminum salts less acidic than aluminum chloride e.g. aluminum hydroxychloride (or aluminum chlorhydroxide). These are described in 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 constitute betwen about 10.0% and about 50.0% of the stick with the preferred 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 of from about 1 00"F to 150"F. Typical suitable low melting point waxes are' fatty acids containing from about 8 to about 22 carbon atoms, fatty alcohols containing 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, myristyi alcohol, Lauryl alcohol and Behenyl alcohol. However, the preferred low melting point wax is stearyl alcohol.

The quantity of low melting 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 of 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 150"F to about 21 5"F. Examples of suitable waxes are beeswax, spermaceti, carnauba, bayberry, candelilla, montan, ozokerite, ceresin, paraffin, synthetic waxes such as Fischer-Tropsh waxes, and microcrytalline wax. The present composition may contain from about 1.0% to about 1 5.0% of this wax. The preferred amount 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 åntiperspirant 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 surfactants 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 (Atlas G-1471), Polyoxyethylene lanolin derivative (Atlas G-1795), Polyoxyethylene fatty ethers (Brij 35), Polyoxyethylene 25 propylene glycol stearate (G-2162), Polyoxyethylene stearate (Myrj 59), Polyoxyethylene sorbitan fatty ethers (Tween 20), Polyoxypropylene poly'oxyethylene condensate (Pluronic F127).

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 anti'perspirant stick compositions of this invention may also contain other ingredients commonly employed in other antiperspirant sticks or other forms of antiperspirant compositions.

Thus, anti-staining agents, suspending agents, gelling agents, fillers, stabilizing agents, antioxidants, pigments, coioring agents, perfumes, preservatives, anti-bacterial agents, etc. may also constitute part of the present sticks.

In preparing the composition of the present invention, the oil, waxes and other relatively low melting materials 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 mixture is then poured into stick molds and allowed to cool.

The following Examples are given to further illustrate the present invention. It is understood, however, that the invention is not limited thereto.

The following terms in the specification and Examples have the meaning ascribed to them below: WIKENOL 369-Aluminum-Zirconium Tetrachlorohydrate Glycine Complex Al 15.0%; C1 17.8%; Glycine 10% DRY FLO STARCH-A modified starch known as Aluminum Starch Octenylsuccinate which is the reaction product of octenylsuccinic 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 MW. cyclomethicones 85% Tetramer D-4; 15% Pentamer D-5 FT-300 WAX-A paraffin wax with a melting point of 230 F G-2162 EMULSIFIER-Polyoxyethylene (25) Propylene Glycol Stearate IONOL C.P.-Butylated Hydroxytoluene SILICONE 21 58-Cylcomethicone, predominately Pentamer D-5 Az4 (MlCRODRY)-Aluminum-Zirconium Trichlorohydrate EXAMPLE 1 % by Wt.

(1) Montan Wax WSW 4.

(2) Dibutyl phthalate 32.

(3) Wikenol 369 22.

(4) DRY FLO Starch 32.

(5) Procetyl AWS 4.

(6) Silicone 251 5.

(7) Perfume 1.

Ingredients 1, 2, 5 and 6 are thoroughly mixed together and heated to about 160"F 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.

EXAMPLE 2 % by Wt.

Stearyl alcohol 21 FT-300 Wax 2 G-2162 emulsifier 2 lonol C.P. 0.05 Silicone 7158 41.55 TiO2 0.40 Az4 (MICRODRY) 22 DRY FLO Starch 10 Perfume 1 The procedure similar to that given in Example 1 is used in formulating the stick.

Although the invention has been described with reference to specific forms thereof, it will be understood that many changes and modifications may be made without departing from the scope of this invention.

Claims (6)

1. 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. 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. A composition according to Claim 1 or 2 in which said active antiperspirant material takes the form of an astringent aluminum or zirconium compound or complex or mixtures thereof.

4. A said composition according to Claim 1, 2 or 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. A composition according to Claim 1, 2, 3 or 4 in which said starch is aluminum starch octenylsuccinate.

6. A composition according to claim 1, substantially as described in either of the foregoing Examples.