HIGH PAY-OFF ANTI-PERSPIRANT STICK

BATON ANTISUDORIFIQUE TRES EFFICACE

English Abstract

ABSTRACT
This invention relates to a method for the preparation of an anti-
perspirant deodorant composition in the form of a compressed cylindrical pel-
let (hereafter referred to as compressed powder stick). In this method a
powdered mixture of talc, aluminum chlorhydroxide, magnesium stearate, kaolin,
calcium carbonate, rice starch and glycine is compressed between 600 and
3,000 p.s.i. using a hydraulic press. The resulting product exhibits remark-
ably high "pay-off" characteristics and strength (against breakage).

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for the preparation of an anti-perspirant and deodorant
composition in stick form and exhibiting high "pay-off" and strength, which
process comprises mixing together an anti-perspirant chosen from aluminum
chloride, aluminum sulphate and aluminum chlorhydroxide and mineral oil
as a first blend; rice starch and water as a second blend; and talc,
perfume, kaolin, an inorganic stearate chosen from magnesium stearate, zinc
stearate and calcium stearate, glycine, calcium carbonate, and a deodorant
agent as a third blend; mixing the three blends together; and thereafter
compressing the resulting mixture at a pressure of between 600 psi and
3,000 psi to form a unitary powder stick, the amounts of components used
in the three blends, and the amounts of each blend taken for compression
being sufficient to provide in the unitary powder stick an amount of each
component both falling within the following percentage weight ranges and
totalling to 100%:
<IMG>
2. A method according to claim 1 wherein the inorganic stearate
compound is magnesium stearate.
3. A method according to claim 1 wherein the aluminum anti-perspirant
compound is aluminum chlorhydroxide.
4. A method according to claim 1 in which the deodorant agent is
2,4,4'-trichloro-2'-hydroxy-diphenyl ether.

5. A method according to claim 1 in which the anti-perspirant is
aluminum chlorhydroxide, the inorganic stearate is magnesium stearate, the
deodorant compound is 2,4,4'-trichloro-2'-hydroxy-diphenyl ether, and the
amounts present in the powder stick are:
<IMG>
6. An anti-perspirant and deodorant composition in stick form
and exhibiting high "pay-off" which comprises 5 to 25% of talc; 20 to
about 77.8% of an anti-perspirant chosen from aluminum chloride, aluminum
sulphate and aluminum chlorhydroxide; 5 to 20% of an inorganic stearate
chosen from magnesium stearate, zinc stearate and calcium stearate; 1 to
10% of kaolin; 1 to 5% calcium carbonate; 10 to 40% of rice starch; zero
to 1.0% of mineral oil; zero to 3.0% of water; 0.1 to 5.0% of glycine;
0.001 to 1.0% of perfume and 0.01 to 1.0% of a deodorant agent, the whole
having been converted into a stick form by blending and molding at a
pressure of from 600 psi to 3,000 psi.
7. A composition according to claim 6 wherein the anti-perspirant is
aluminum chlorhydroxide.
8. A composition according to claim 6 wherein the inorganic stearate is
magnesium stearate.
9. A composition according to claim 6 wherein the deodorant agent is
2,4,4'-trichloro-2'-hydroxy-diphenyl ether.
10. A composition according to claim 6 in which the anti-perspirant is
aluminum chlorhydroxide, the inorganic stearate is magnesium stearate,

the deodorant compound is 2,4,4'-trichloro-2'-hydroxy-diphenyl ether, and
the amounts present in the powder stick are:
<IMG>

Description

106B2~5
This invention relates to a method for the preparation of a powdered
anti-perspirant deodorant composition in the form of a compressed cylindrical
stick, having a dome shape at one end of the cylinder. This invention also
includes within its scope the resulting anti-perspirant deodorant compressed
powder stick.
Anti-perspirant compositions have been used to inhibit perspiration
as well as provide deodorant properties to the human body. Heretofore these
compositions have been available in the form of aqueous sprays, roll-ons, gel
sticks, creams and the like. These compositions are generally quite unsatis-
factory to use because they have the tendency to stick to the clothing. InBritish Patent 996,560, there is described an an~i-perspirant and deodorant
composition in the form of a dry stick. Such a composition, while represent-
ing some improvement over previously known forms, is still not quite satis-
factory because: 1. The stick is too brittle or fragile if compressed
according to the patent (60 - 150 p.s.i.). 2. The ingredients are not
readily released upon rubbing on the body surface area, if compressed at
higher pressure (1000 - 3000 p.s.i.) in order to reduce the brittleness.
The term "pay-off" used herein and in the specification and in the
claims denotes the phenomenon in which compressed powder in stick form will
release the ingredients under gentle friction. For example, a good "pay-off"
would indicate that the powder stick, when applied under gentle pressure,
will release the ingredients evenly and provide a good protective coating `
upon the body surface area.
According to the present invention, there is provided a method for
the preparation of an anti-perspirant and deodorant composition in stick form
and exhibiting high "pay-off" and strength, which process comprises mixing
together an anti-perspirant chosen from aluminum chloride, aluminum sulphate
and aluminum chlorhydroxide and mineral oil as a first blend; rice starch and
water as a second blend; and talc, perfume, kaolin, an inorganic stearate
`30 chosen from magnesium stearate, zinc stearate and calcium stearate, glycine,
calcium carbonate, and a deodorant agent as a third blend; mixing the three
blends together; and thereafter compressing the resulting mixture at a
- 1 -
'~''`'~ ~

1068Z15
pressure of between 600 psi and 3,000 psi to form a unitary powder stick,
the amounts of components used in the three blends, and the amounts of each
blend taken for compression being sufficient to provide in the unitary powder
stick an amount of each component both falling within the following percentage
weight ranges and ~otalling to 100%:
talc: 5% to 25% aluminum chlorhydroxide: 20% to about
77.8%
magnesium stearate: 5% to 20% kaolin: 1% to 10%
calcium carbonate: 1% to 5% rice starch: 10% to 40%
mineral oil: 0.0% to 1.0% water: 0.0% to 3.0%
glycine: 0.1% to 5.0% perfume: 0.001% to 1.0%
deodorant agent: 0.01% to 1.0%
To enhance consumer acceptance, small amounts of fragrance such as
perfume varying between 0.0001 to 1% may also be included.
In a typical practice of this invention, the aforementioned ingred-
ients are blended together until an homogeneous mixture is obtained. To the
blended mixture a small amount of water is added followed by further mixing
to ensure proper mixture. Typically, the ingredients are passed through a
suitable blender such as a Fitzmill* fitted with a suitable screen so that
` the resulting powder will exhibit uniform particle size. The powder is then
fed into a dome-shaped mold about 1.5" in diameter and about 3 to 4" in
height. A pressure of at least 600 to 3,000 p.s.i. is applied to the powder
for about 10-30 seconds, compressing the powder into a stick, about 1.5" in
,. .
`~ diame~er and about l.l" in height, which is readily released fromthe mold.
~ In a modified practice the powder is compressed directly onto a
:, :
supporting round disk which has a conical cross-shaped insert for holding
~; the stick.
'~
' In another example the mineral oil is blended with the anti-perspir-
ant deodorant compound (aluminum chlorhydroxide) and the blend passed through
,~
;i.,
l~ *Trade Mark of the Fitzpatrick Co., Philadelphia, Pa., U.S.A.
. .
- 2 -
.: ~

~0682~5
a Fitzmill. The water is sprayed into the rice starch, and the wet rice
starch passed through a Fitzmill*. All the other ingredients are blended
together and passed through a Fitzmill*. The three blends are then combined
and mixed until homogeneous. The powder is then compressed as mentioned
above.
We have found the use of magnesium stearate or its equivalent
such as zinc stearate or calcium stearate essential to control the "pay-off"
which is further illustrated in the following example.
Furthermore, we have also found the use of rics starch, or other
finely powdered starch, essential to impart strength or binding to the
compressed stick, without impairing the "pay-off" of the product.
A commonly used deodorant compound such as 2,4,4'-trichloro-2'-
hydroxy-diphenyl ether may be included in the formulation to broaden the
spectrum of the resulting composition.
It may also be desirable to include other doedorant compounds with
a view to reducing odor-forming bacteria on the skin. These include, for
example, 2,2'-thio-bis-(4,6-dichlorophenol) or bis-3,4,6-trichloro-2-hydroxy- -~
phenyl) methane in an amount of 0.1 to 10% depending upon the ingredients
selected to be included in the formulation.
As described above, the present composition includes glycine.
The inclusion of glycine is advantageous because it acts as a buffer to
neutralize the acid formed through the hydrolysis of the aluminum-containing
antl-perspirant compound.
The invention will now be illustrated by way of the following
examples.
EXAMPLE 1
A homogenous mixture is prepared from the following ingredients:
INGREDIENT % FORMULA
Magnesium Stearate USP 12.5
~:
30 ~ Talc USP, Alp~ne No. 123* 16.07
* Trade Marks
.
-- 3 --

1068215
INGREDIENT ~ FORMULA
Floral Fragrance 8311-X 0.03
Kaolin Colloidal NF 5.0
Aluminum Chlorhydroxide, Micro Dry 40.0
Mineral Oil Light NF 0.5
Irgasan DP-300* (Micronized) 0.2
Glycine NF* (Micronized) 2.0
Calcium carbonate USP, Light Precip. 2.5
Water (Hot) 1.2
Rice Starch 20.0
After the water is added, the mixture is passed through a Fitzmill*
at high speed, having attached thereto a "000" screen. The mixture is mixed
until homogenous. Alternatively, the mineral oil is blended with the alum-
inum chlorhydroxide, and the blend passed through a Fitzmill* (or similar mill).
The water is sprayed into the rice starch, and the wet rice starch passed
through a Fitzmill*. All other ingredients are blended together and passed
through a Fitzmill*.
The three blends are then combined and mixed until homogenous.
About 32.0 grams of the resulting powder is compressed into dome-
shaped sticks by utilizing a mold about 1.5" in diameter and about 3 - 4" in
height at a pressure of about 2,000 p.s.i. After holding the pressure at
2,000 p.s.i. for about 20 seconds, there is obtained a unitary anti-perspir-
and composition exhibiting exceptional "pay-off" and strength. To further
increase the strength of the stick, the powder may be compressed directly
onto a supporting disk which has a conical cross shaped insert for holding
the stick.
EXAMPLE 2
In order to illustrate further the advantages of the present stick,
a comparlson is made against a composition described in said British Patent
996,560. The formulations are as follows:
* Trade Marks
-- 4 --

`~ 1068215
PRESENT FORMULATION OF BRITISH
FORMULATION PATENT NO . 996, 560
Talc 16.07 % 40 - 70 %
All~inum Chlorhydroxide 40.0 % 12 - 25 %
Kaolin 5.0 % 14 - 40 %
Zinc Stearate - 0.5 - 5 %
Magnesium Stearate 12.5 %
Mineral Oil 0.5 % 1.0 - 8 %
Glycine 2.0 % -
10 Magne~ium Carbonate - 0.5 - 5%
Calcium Carbonate 2.5 %
Water 1.2 %
Rice Starch 20.0 % - :
Hexachlorophen 0.1 - 0.5 % ;.
2,4,4'-trichloro-2!- 0 2 %
hydroxy aiphenyl ether
Pigment - O.25 - 1.0 %
,:
Perfume 0.03 % 0.10 - 1.0 %
, .,
The present formulation exhibits a consistant high degree of
"pay-off" without being brittle.
" ~ ~
c.,: ~
'. S
'.' ~
.~