CA1097223A - Fatty acid salt and aliphatic c in16 xx alcohol as antiperspirant stick - Google Patents

Abstract

ABSTRACT

A solid, wax-like antiperspirant stick composition comprising from about 20 to 50 weight percent ethanol, from about 15 to 25 weight percent aluminum chlorhydrate, from about 15 to 60 weight percent of one or more straight or branched chain aliphatic alcohols containing 16 carbon atoms and from about 0 to 10 weight percent of a magnesium or calcium salt of a long chain fatty acid.

Description

~ 26,454 ~7~3 This invention relates to solid, wax-like antiperspirant stlck compositions and, more particularly, to alcohol-based antiperspirant stick compositions.
Heretofore, alcohol-based an-tiperspirant stick S compositions have been difflcult to make and also relatively ineffective~ In general, they haven contained sodium stearate to provide an adequate degree of hardness and, since sodium stearate is a strongly alkaline soap it reacts with and deactivates aluminum chlorhydrate.
Thus, it has been necessary to utilize less than effective amounts of less effective active ingredient, such as al~minum chlorhydrate lactate. ;
A highly effective solid antiperspirant stick composition combining stearyl alcohol, a highly ethoxy-lated stearyl alcohol and a volatlle silicone is disclosed by Geary et al. in a commonly assigned Canadian copending application, serial number 282r590 filed July 12, 1977. These compositions are readily compatible with effective antiperspirant amounts of aluminum chlorhydrate and do not require strong alkaline soaps, such as sodium stearate, to achieve a desirable degree of hardness. Nevertheless, they are relatively ~ expensive compos~ltions and efforts~have continued toward `~ the preparation of efficacious alcohol-based compositions.

Neither the stearyl alcohol nor the hlghly ethoxylated stearyl alcohol of the aforementioned application are sufficiently soluble in ethanol to ~: : :
provide a desirable antispirant stick composition.
The present invention is based on our discovery that straight or branched chain Cl6 -aliphatic alcohols are readily soluble in ethanol to provide a solîd, wax-like antlperspirant stick composition containing effective amounts of aluminum chlorhydrates. ~

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`~ 37~Z;3 Thus, in accordance with the invention an efective solid antiperspirant stick composition is obtained by a :

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97~23 combination of rom about ~0 to 50 weiyht percent ethanol, about 15 to 25 weight percent aluminum chlorhydrate, from ~Ibout lS ~o 60 weight percent o~ one or more straight or branch-ed chain C16 aliphatic alcohols, and up to about 10 weight percent oE one or a mixture of aluminum, zinc, magnesium or calcium salts of a long chain fatty acid.
In preferred embodiments of the invention cetyl alcohol is used as the aliphatic alcohol, combined with a sufficient amount of the fatty acid salt to provide a desirable degree of hardnes~ and to improve the gel or set time of the composition.
In especialIy preferred embodiments of the inven-tion a combination of cetyl alcohol and a highly ethoxylated cetyl alcohol comprise the Cl5 -alcohol. In these compositions sufficient alcohol is used to~dissolve aluminum chlorhydrate to provide from about lS to 25 weight percent thereof in the ;~
antiperspirant compositlon, and a combination of cetyl alcohol and ethoxylated cetyl alcohol dissolved thereln. ~ ~ ;
The antiperspirant compositions of the invention ;
will contain from about 20 to 50 weight percent~ethanol.
The amount of ethanol may vary within the above range depending on the concentration of aluminum chlorhydrate used and on the aoount of Cl6 -alcohol, or mixture thereof,~and ~atty acid salt~used to obtain desired propertles, i.e., hardness and transluscence, ranging from clear sticks to those approa~hing opacity.
The Cl~-aliphatic alcohol may be a straight chain alcohol, iOe., cetyl alcohol, or a branched chain alcohol, such as 2-hexadecanol, or a mixture thereof. Cetyl alcohol is preferred. The compositions may contain cetyl alcohol alone in amounts up to 60 weight percent, in which case it - may be desirable to incorporate up to about lO weight percent ~7;2Z,~ -of fa~ty acid salt to achieve the desired hardness. Alterna-tively, the compositions may contain branch~d chain C16 -alcohols or mixtures thereof with cetyl alcoholO
In preferred embodiments the C16 -alcohol is com-S bined with lesser amounts of a highly ethoxylated C16 alcohol.
Highly ethoxylated cetyl alcohol is preEerred. The term highly ethoxylated means a straight or branched chain C16 -alcohol having from about 100 to 200 moles of ethylene oxide combined therewith. These compounds are represented by the formula:
1 0 , ,,, C16 H33 O ~ CH2 CH2 O ~ ll n where n is an integer from about 100 to 200 Ethoxylated cetyl alcohol in which the integer n is about 100 is preferred, aIthough cetyl alcohol ethoxylated to a higher degree or highly ethoxylated branched chain C16 -alcohols, or mixtures of highly ethoxylated Cl~-alcohols, may be used.
As already mentioned hereinabove, the compositions may con-tain only the straight or branched chain C16 -aloohol, or mixtures thereof, or combinations of straight or branched chain C16 -alcohols and highly ethoxylated straight or branched chain C16 -alcohols. ThP highly ethoxylated C16 -alcohoIs provide increased hardness to the composition and the amount added in combination with the straight or ~ranched chain C16 -alcohol may vary according to the hardness desired and also on the amount of atty acid salt added for a similar purpose.
The weight ratio of C16 -alcoho] to highly ethoxylated C16 -alcohol may vary from 100/0 to 3/1, respectively. ~atios of about 3/1 to 6/1 are preferred. A calcium, aluminum, zinc - or magnesium salt of a long chain fatty acid may ~e added thereto, depending on properties d~sired, from none to as ~ 7ZZ3 much as 10 weigh-t percent.
In addition to the highly ethoxylated C15 -alcohol and/or C16 -alcohol, minor amounts of less highly ethoxylated C16 -alcohols, i.e., those having from about 2 to 50 moles of combined ethylene. oxide, may be added, or, minor amounts of propoxylated C16 -alcohols may also be included. These less ethoxyla~ed C16 -alcohols are optional.
The aluminum, zinc, magnesium or calcium salt of a long chain fatty acid is added, if necessary, to adjust hardness and set or gel time of the composition or both.
Addition of magnesium s~earate, for example, wil} often permlt the composition to gel at higher temperatures, thereby obviat~
ing the need for cooling. Representative fatty acids~ include stearic acid, myristic acid, palmitic acid, lauric acid, and ~lS the like. Magnesium stearate~is preferred.
The active astrinyent is preferably aluminum~chlor-hydrate. The term aluminum chlorhydrate is intended to include the various aluminum chlorhydrate salts~used in ant1perspirants, ~ ~ particularly those~in whlch the aluminum/chloride ratio is ;~20 be~ween 2/1 to 1/2, for example, Al~OH3C12, Al(OH)2Cl, Alz(OH) Cl, etc. Also useful is baslc aluminum~bromide .- . .
In addition to the major ingredients discussed above, other additives may be incorporated in minor amounts, such as~waxes, for éxamp'e, ~ontan wax or hydrogenated castor ~S ~oil; emollients, such as isopxopylmyristate; silicones; fragran-ces, dyes, and the like.
:
~ The invention is illustrated in more detail by : :
~ the following exemplary formulations~
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Example 1 .
-Parts by wei~ht ~luminum chlorhyclrate 25.0 Cetyl alcohol 22.0 ;
100 P.O.F. Cetyl alcohol (1) 8.0 Montan wax 4.0 Ethoxylated cetyl alcohol ( ~ 3.5 . Ethanol 37-5 . 100. 0 (1) C~13 (C112)~4 C~12.--~Cll2cH2 ~

(2) C~3 (CH2)14 C~12 --tC~12C~20 t7~-:
Example 2:~
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Parts:hy wei~ht : ~luminum chlorhydrate ~ ~: 25.0 Cetyl alcohol ~15.5 100 P.O.E. Cetyl alcohol : 4.0 Hydrogenated castor oil 4.0 : ; Magnesium stearata ~ 10.0 Ethoxylated cetyl alcoho} (3) ~ ~ 1.5 ` Pro~oxylated cetyl alcohol~:4)~ ~ 2.5 ; Ethanol 37.5 ~ . ~ 100.0 : ~ (3) C~13 (CH2jl4 C112 o--tCH2CH2 ~ H
(4) CH3 (CH2)14 CH2 O--~CHCH2 )1~ H

: 3 :
.

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~97~23 l~lrt ~y_we1gllt ~luminum chlorhydrate 25.0 Cetyl alcohol 12.5 100 P.O.E. Cetyl alcohol 4.0 Hydrogenated castor oil ~0 Magnesium stearate 13.0 Ethoxylated cetyl alcohol (3) 1.5 Isopropyl myristate 2.S
Ethanol 37.5 :100. O.

Æxample 4 :~

~ ~ ; Parts by welght~
Aluminum chlorhydrate : ~ 13.9 :
Cetyl alcohol : 55.7 :~
: Magnesium stearate~ : ~: 9.4 .-: E-thanol ~ 21.0 ~ :
: 20 100.0~ -.
: - F.xam~,le 5 :~ :~: ~ : : . .

~ Par-ts by weight ;~ : 25 ~ Aluminum chlorhydrate ~19.6 ~ :
Cetyl alcohol 42.0 : : Magnesium stearate 8.6 : L-45 Silicone (5) 0O5 Ethanol : 29.3 100.0 , ~

7;~3 .:
(5) Dim~thicone, mixture of Eu.l.ly mctl~yl~to~ o;
slluxane polymers ~nd block~d witll ~rim~thy~
oxy units:
C'113 ~ c~i}l3 ~ clll3 C~13 - Si - o - - Si - ~ - Si- CH3 CH3 _ C~13 C1~3 n ~xample 6 ~ ~ :
' .: .. ' Par ts by w~ht " '' Aluminum chlorhydra-te 25.0 : .
Cetyl alcohol 17.8 ~ : ;
Magnesium stearate~ 7.2 .
E~hanol E~xample 7 / . . ~ ,.
Parts b~_welght ~ .
Aluminum ch1orhydrate ~ 25~0 Cetyl alcohol: ~ 20.7 ;~
.
Magnesium stearate~ 8.3 Ethanol ~ : : 4&.0 i ~ 30 : :
:

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~9~'~Z3 E'xamE?le 8 bv ~
~luminum chlorhyclra-te 25. a Cetyl alcohol 25 . 0 l~laynesium stearate 10.0 ~thanol ~-`100. 0 , ' ' ~, .
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Claims (4)

26,454 WE CLAIM:

1. A solid, wax-like antiperspirant stick composition comprising from about 20 to 50 weight percent ethanol, from about 15 to 25 weight percent aluminum chlorhydrate, from about 15 to 60 weight percent of one or more straight or branched chain aliphatic alcohols containing 16 carbon atoms and from about 0 to 10 weight percent of a magnesium or calcium salt of a long chain fatty acid.

2. A composition according to Claim 1 wherein said aliphatic alcohol is cetyl alcohol and said fatty acid salt is magnesium stearate.

3. A solid wax-like antiperspirant stick composition comprising from about 20 to 50 weight percent ethanol, from about 15 to 25 weight percent aluminum chlorhydrate, from 15 to 60 weight percent of a combination of one or more straight or branched chain aliphatic alcohols containing 16 carbon atoms and one or more ethoxylated straight or branched chain aliphatic alcohols containing 16 carbon atoms, and up to about 10 weight percent of a magnesium or calcium salt of a long chain fatty acid; the weight ratio of said C16 alcohols being in the range of from about 100:0 to 3:1 and said ethoxylated C16alcohol being represented by the formula:
wherein n is an integer from about 100 to 200.

4. A composition according to Claim 3 wherein said C16alcohol is cetyl alcohol, said ethoxylated C16 alcohol is ethoxylated cetyl alcohol, wherein n is about 100, and said weight ratio ranges from about 3:1 to 6:1.