Note: Descriptions are shown in the official language in which they were submitted.
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-- 1 --
STABLE, CLEAR ANTIPERSPIRANT
COMPOSITION AND METHOD OF USE :~:
Field of the Invention
This invention relates generally to antiperspirant
compositions and, in particular, to a stable, clear
antiperspirant composition that is available in stick
form. ~ -
Background of the Invention -
Antiperspirant stick compositions represent an
important and growing segment of the antiperspirant and
deodorant market as the demand for environmentally
unfriendly product forms such as aerosols wanes. Prior
art antiperspirant stick compositions often leave an
unsightly and unpleasant white residue on the skin.
This residue film can leave a mark or stain on clothing
worn in the area where the composition has been applied.
In recent years there has been a trend towards
clear products in many fields as clear products are
perceived to be less damaging to the environment. While
clear deodorant stick compositions have been formulated
successfully, the formulation of a clear antiperspirant
gel stick composition has proved to be more problematic.
The temperatures required for processing gel stick
compositions are high. Furthermore, typical
antiperspirant active agents are aggressive acids with a
pH of less than 5. In general, gellants degrade at high
temperatures and at a pH of less than about 7.
It would, therefore, be desirable to provide a
30 stable, clear antiperspirant gel stick composition. _ -
This invention provides a clear antiperspirant
composition.
This invention also provides a clear
antiperspirant gel composition.
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-- 2
This invention further provides a clear
antiperspirant composition with a sufficient amount of
an antiperspirant active agent to prevent perspiration.
This invention also provides a clear
antiperspirant gel composition with a pleasant feel.
This invention further provides a clear
antiperspirant gel composition that exhibits minimal
decomposition.
This invention also provides a stable, clear
antiperspirant gel composition that, in the absence of
fragrancing agents, has little or no odor.
This invention still further provides a clear
antiperspirant gel composition that`does not contain any
volatile organic compounds.
This invention even further provides a clear
antiperspirant gel composition that does not exhibit
syneresis or sweating.
Still other objects and advantages of the
invention will in part be obvious and will in part be
apparent from the specification.
Summary of the Invention
Generally speaking, a stable, clear antiperspirant
composition having an antiperspirant active, a dihydric
alcohol as a primary solvent, a cosolvent such as low
molecular weight polyethylene glycol (l.m.wt. PEG),
water, and/or glycerine, a buffering agent, and a
gelling agent is provided. The antiperspirant active is
preferably an aluminum salt or an aluminum and/or
zirconium complex. A method for reducing perspiration
using the composition is also provided.
The invention accordingly comprises a composition
of matter possessing the characteristics, properties,
and the relation of components which will be exemplified
2~ 2~t~3
.
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in the composition hereinafter described, and the scope
of the invention will be indicated in the claims.
Detailed Description of the Preferred Embodiments
The present invention is a stable, clear ~ -
antiperspirant gel stick composition including an
antiperspirant active, a dihydric alcohol as a primary
solvent, a cosolvent such as low molecular weight
polyethylene glycol (l.m.wt. PEG), water, and/or
glycerine, a buffering agent, and a gelling agent.
In the absence of fragrancing agents, the
composition of the invention has an acceptable odor. The
odor of a gel composition is a measùre of stability
since an almond odor that is characteristic of -
15 benzaldehyde will be present if there is degradation of --
the gelling agent. In general, an odor rated at less
than or equal to 3 on a scale of 0 to 5 wherein 0
represents no odor and 5 represents a distinctive odor
is considered acceptable.
The composition also has a satisfactory clarity.
Clarity is rated on a scale of 0 to 5 wherein 0
represents complete clarity and 5 represents opacity.
A clarity of less than or equal to 3 is considered
satisfactory. In addition, it is preferable if the
composition does not salt, i.e. become gritty, when it
is stored for a period of time.
Effective antiperspirant active agents are
aggressive acids. The antiperspirant active is
generally an aluminum astringent antiperspirant salt or
an aluminum and/or zirconium astringent complex having a
pH of less than or equal to about 5. Aluminum salts are
not effective antiperspirant active agents at a pH of
greater than about 5 because the salt breaks down into
insoluble components. This breakdown of the salt into
insoluble components also causes the composition to
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-- 4
become cloudy, which is especially undesirable with
respect to the formulation of a clear composition.
The inherent pH of an unbuffered antiperspirant
active is between about 3.5 and 4.4. In the composition
provided in accordance with the invention, which is
buffered, the pH of the antiperspirant active is
preferably between about 4 and 4.9 and more preferably,
between about 4.5 and 4.8.
The antiperspirant active is preferably selected
from the group consisting of aluminum halides, aluminum
hydroxyhalides, aluminum sulfates, zirconyl oxyhalides,
zirconyl hydroxyhalides, and mixtures thereof. In a
more preferred embodiment, the antipèrspirant active is
aluminum chlorohydrex, which is a solid complex of
aluminum chlorohydrate and propylene glycol. It is
available from Reheis Chem. Co. of Berkeley Heights, NJ
and i9 sold under the trade name REHYDROL~.
The antiperspirant active is present in an amount
sufficient to prevent perspiration and is generally
present in an amount between about 10% and 30% by weight
of the composition. In a preferred embodiment, the
antiperspirant active is present in an amount between
about 10% and 25% by weight of the composition; in a
more preferred embodiment, the antiperspirant active is
present in an amount between about 15% and 25% by
weight; and, in a most preferred embodiment, the -
antiperspirant active is present in an amount between
about 18% and 25% by weight.
A significant percentage by weight of the
30 composition is a primary solvent for the antiperspirant -~
active agent. The primary solvent is a dihydric alcohol
preferably selected from the group consisting of
propylene glycol, hexylene glycol, dipropylene glycol,
pentanediol, and mixtures thereof. In a more preferred
embodiment, the primary solvent is propylene glycol.
-- 5
The primary solvent is present in an amount
sufficient to dissolve both the antiperspirant active
agent and the gelling agent and is generally present in
an amount between about 10~ and 70% by weight of the
composition. In a preferred embodiment, the solvent is
present in an amount between about 15% and 70~ by
weight.
A cosolvent for the gelling agent is also
present. The cosolvent is selected from the group
consisting of low molecular weight polyethylene glycol,
water, glycerine, and mixtures thereof. The cosolvent
is typically present in an amount between about 1% and
30~ by weight of the composition. ` ~ -
When low molecular weight polyethylene glycol --
15 (l.m.wt. PEG) is used in the composition, it is ``
effective to inhibit salting since materials that would
cause the composition to salt or become gritty are
generally soluble in l.m.wt. PEG. The l.m.wt. PEG also
functions as an emollient to cause the gel composition
to have a gliding effect on skin. Additionally, the PEG
causes the composition to feel "less sticky" than it
would if no l.m.wt. PEG were present.
The l.m.wt. PEG used in the composition as an
anti-salting agent is a liquid at room temperature with
an average molecular weight of less than or equal to
about 1,000. In a preferred embodiment, the l.m.wt. PEG
has an average molecular weight of less than or equal to
about 600 and in an especially preferred embodiment, the
l.m.wt. PEG has an average molecular weight of less than
or equal to about 400.
The l.m.wt. PEG is generally present in the
composition in an amount between about 1% and 20% by
weight of the composition. In a preferred embodiment,
the l.m.wt. PEG is present in an amount between about 5
and 15% by weight of the composition and in an
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especially preferred embodiment, the l.m.wt. PEG is
present in an amount between about 7~ and 13~ by weight.
Water can be included in the composition as an
alternate or additional cosolvent. Water functions to
prevent syneresis or sweating of the composition on
exposure to air. In addition, water can also be used to
give the composition a dry feel as opposed to a sticky
feel. When water is present in the composition, there
must be sufficient gelling agent to cause the
composition to solidify at a temperature of less than or
equal to about 90C so that the water does not boil off
durlng processing.
The amount of water used shoul`d be between about
1% and 20% by weight of the composition. In a
preferred embodiment, the amount of water is between
about 3% and 15% by weight of the composition; in a more
preferred embodiment, the amount of water is between
about 5% and 15% by weight; and, in an even more
preferred embodiment, the amount of water is between
about 5% and 13% by weight.
A third alternate or additional cosolvent is
glycerine. When used, glycerine functions as an
emollient to give the composition a smooth, gliding feel
on the skin.
The amount of glycerine used should be between
about 1% and 20% by weight of the composition. In a
preferred embodiment, the amount of glycerine is between
about 3% and 15% by weight of the composition and in an
especially preferred embodiment, the amount of glycerine
is between about 5% and 13% by weight.
A buffering agent or system is used in the
composition of the invention to prevent wide pH swings.
Ideally, the buffering agent is an acid/base system
having a pKa of from about 3.5 to about 5, preferably
from about 4.5 to about 5.
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-- 7
The buffering agent is selected from the group
consisting of phosphate buffers such as sodium or
potassium phosphate, phosphoric acid, potassium
hydroxide, potassium acid phthalate, triethanolamine,
citric acid, sodium citrate, aluminum lactate, lactic
acid and mixtures thereof. In a preferred embodiment, a
buffer solution of citric acid, sodium citrate and
potassium hydroxide is used.
In general, an inorganic buffering agent is more
heat stable. However, phosphate buffers, for example,
increase the amount of salting or grittiness that occurs
on standing due to breakdown of the antiperspirant
active salt into insoluble component`s.
The greater the amount of buffering agent in the
composition, the better the stability of the composition
and the better the pH is controlled. On the other hand,
lower amounts of buffering agents are preferred in order
to increase the clarity of the solution and decrease the
formation of insoluble components.
The buffering agent is generally present in an
amount between about 0.1% and 3~ by weight of the
composition of the invention. In a preferred
embodiment, the buffering agent is present in an amount
between about 0.2% and 2% by weight of the composition
and in an especially preferred embodiment, the buffering
agent is present in an amount between about 0.2~ and 1
by weight.
A material that functions as a gelling agent at a
low pH and at high temperatures of up to about 140C is
also present in the composition. The gelling agent is
selected from the group consisting of dibenzylidene
sorbitol resin, derivatives of dibenzylidene sorbitol
resin and mixtures thereof. In a preferred embodiment,
the gelling agent is dibenzylidene sorbitol resin. ~;;
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-- 8
In general, dibenzylidene sorbitol resin and its
derivatives degrade or decompose under acidic
conditions, specifically at a pH of less than about 7,
and at high temperatures to form sorbitol and
benzaldehyde. This decomposition can be confirmed by
the presence of benzaldehyde, which has a characteristic
sweet odor that is reminiscent of freshly crushed bitter
almonds. However, the presence of the buffering agent
in the composition of the invention slows the
degradation of the dibenzylidene sorbitol resin
considerably, thereby permitting the composition to have
little or no almond odor, which is considered
acceptable.
The gelling agent is preferably present in an
amount between about 1% and 5% by weight of the
composition. In a preferred embodiment, the gelling
agent is present in an amount between about 2% and 4% of
the composition.
Other optional components such as thickening
agents, liquid emollients, emulsifiers, dyes and
fragrancing agents can also be included in the
composition in amounts of between about 0.1% and 10% by
weight of the composition, more preferably, in amounts
between about 0.1% and 5% by weight.
Optional thickening agents include, for example,
solid esters. Solid esters include, but are not limited
to, high molecular weight polyethylene glycol,
polyethylene glycol laurates, polyethylene glycol
cocoates, polyethylene glycol myristates and solid
polyethylene glycol stearates.
One exemplary thickening agent is high molecular
weight polyethylene glycol (h.m.wt. PEG). As used
herein, h.m.wt. PEG is polyethylene glycol with an
average molecular weight of over about 1,000. High
molecular weight polyethylene glycol is a solid at room
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_ 9 -
temperature and therefore, is not useful as an
antisalting agent. The amount of h.m.wt. PEG needed to
perform a thickening agent function decreases as the
average molecular weight of the h.m.wt. PEG increases.
When h.m.wt. PEG is used in the composition, it is -
incorporated in an amount between about 0.5~ and 8~ by
weight. In a preferred embodiment, the h.m.wt. PEG is
used in an amount between about 0.5~ and 5% by weight of
the composition and, in a more preferred embodiment, the
h.m.wt. PEG is used in an amount between about 0.5~ and
2~ by weight.
When used, the amount of h.m.wt. PEG determines
the amount of buffering agent that i`s required. For
example, the optimum amount of buffering agent is in
inverse proportion to the amount of high molecular
weight polyethylene glycol in the composition. When a
large amount of high molecular weight polyethylene
glycol is used, a relatively small amount of buffering
agent is required; conversely, when a small amount of
h.m.wt. polyethylene glycol is used, a relatively large
amount of buffering agent is required.
The clear antiperspirant gel compositions of the
invention are prepared by dissolving the antiperspirant
active resin agent in a first portion of the dlhydric ~-
alcohol solvent, e.g. propylene glycol, or in a mixture
of low molecular weight PEG and a portion of the
dihydric alcohol solvent to yield a first solution.
A second portion of the dihydric alcohol solvent,
the cosolvent, and at least part of the buffering agent
are dissolved separately and heated to a temperature
between about 95 and 140C, preferably between about
110 and 130C, to yield a second solution. The gelling
agent is added to the second solution.
The first solution is heated to a maximum
35 temperature of 100C and added to the second solution so ~-~
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- 10 -
that the temperature does not drop below about 95c. If
water is used as the cosolvent, it can be heated to a
temperature of up to about 95C and added at this point
rather than earlier as indicated above. Any other
optional ingredients can also be added at an elevated
temperature. The solution is packed at about 90C and
allowed to cool.
The compositions prepared in accordance with the
invention are evaluated for odor, clarity and salting.
The following scale was used to evaluate odor:
o No odor
1 Threshold odor
2 Very slight odor
3 Slight odor
4 Moderate odor
Strong odor
An acceptable odor is an odor rated at about 3 or less.
Odor is evaluated on the basis of the almond odor that
is characteristic of benzaldehyde. The presence of
benzaldehyde is an indication of instability of the
composition.
The following scale was used to evaluate
clarity:
0 Completely clear (equivalent to the
?5 clarity of water)
1 Threshold translucence
2 Very slight translucence
3 Slight tranlucence
4 Moderate translucence
Opaque _
A satisfactory clarity is a clarity rated at about 3 or
less.
In addition, the compounds were observed to
determine if they salted or became gritty during
storage.
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~ 11 ~
The composition of the invention can be used as an
antiperspirant by applying an effective amount to
decrease perspiration to the skin of a mammal that
exhibits perspiration. The composition dries on the
skin and has a pleasant feel.
The following non-limiting Examples are presented
for purposes of illustration only and are not to be
construed in a restrictive sense.
Example 1
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 25.00 parts by
weight of propylene glycol in a stainless steel
container equipped with a Lightnin mixer and a hot water
bath. Stirring was continued for 10 minutes and the
solution-was heated to ~0C. Stirring was continued
until the solution became clear.
In a separate container, 19.30 parts by weight of
propylene glycol, 1.50 parts by weight of potassium
hydroxide, and 15.00 parts by weight of polyethylene
glycol 200 were combined and heated to 125C. Three and
two-tenths (3.20) parts by weight of dibenzylidene
sorbitol was feathered into the mixture with rapid
stirring. Stirring was continued until the
dibenzylidene sorbitol was dissolved.
The aluminum chlorohydrex solution in the
stainless steel container was heated to 95C and added
to the solution in the separate container.
Ten (10.00) parts by weight of deionized water and
5.00 parts by weight of a 40~ aqueous solution of
aluminum lactate with a pH of 5 were combined, heated to
95C, and added to the solution in the separate
container. One ~1.00) part by weight of fragrance was
added at 95C. The solution was packed at 90C and
allowed to cool.
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The resulting clear gel antiperspirant stick had a -
threshold almond odor rated at 1 on a scale of 0 to 5.
The clarity of the resulting clear gel stick was rated
as 0.5 on a scale of 0 to 5. Salting was observed on
storage.
Example 2
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 30.00 parts by
10 weight of propylene glycol in a stainless steel -
container equipped with a Lightnin mixer and a hot water
bath. Stirring was continued for 10 minutes and the
solution was heated to 40C. Stirring was continued
until the solution became clear. -
In a separate container, 23.40 parts by weight of
propylene glycol, 1.50 parts by weight of 99
triethanolamine, and 6.00 parts by weight of
methoxypolyethylene glycol 5000 were combined and heated
to 125C. Three (3.00) parts by weight of dibenzylidene
sorbitol was feathered into the mixture with rapid
stirring. Stirring was continued until the
dibenzylidene sorbitol was dissolved.
The aluminum chlorohydrex solution in the
stainless steel container was heated to 95C and added
to the solution in the separate container.
Thirteen (13.00) parts by weight of deionized
water, 2.00 parts by weight of 0.5M potassium phosphate
and 5.5~ phosphoric acid in water, and 0.10 part by
weight of 1% F,D & C Blue #1 in water were combined,
heated to 95C, and added to the solution in the
separate container. One (1.00) part by weight of
fragrance was added at 95C. The solution was packed at
90C and allowed to cool.
The resulting clear gel antiperspirant stick had a
pH of 4.5 and was-light blue-green in color. It had a
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- 13 -
threshold almond odor rated at 1 on a scale of 0 to 5.
The clarity of the resulting clear gel stick was rated
as l on a scale of 0 to 5. Salting was observed on
storage.
Example 3
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 25.00 parts by
weight of propylene glycol as described in Examples 1
and 2. In a separate container, 35.55 parts by weight -
of propylene glycol, 1.70 parts by weight of 50%
potassium hydroxide, and 0.75 parts by weight of
polyethylene glycol 5000 were combined and heated to
125C. Two (2.00) parts by weight of dibenzylidene
sorbitol was feathered into the mixture with rapid
5tirring and dissolved as described. The aluminum
chlorohydrex solution in the stainless steel container
was heated to 95C and added to the solution in the
separate container.
Twelve (12.00) parts by weight of deionized water,
0.90 parts by weight of lM citric acid and 2.00 parts by
weight of lM dipotassium phosphate were combined, heated
to 95C, and added to the solution in the separate
container. Ore (1.00) part by weight of fragrance was
added at 95C. The solution was packed at 90C and
allowed to cool.
The resulting clear gel antiperspirant stick
had a pH of 4.5. It had a barely noticeable almond odor
rated at 0.5 on a scale of 0 to 5. The clarity of the
resulting clear gel stick was rated as 3 on a scale of 0
to 5. Salting was observed on storage.
Example 4
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 25.00 parts by
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- 14 -
weight of propylene glycol as described. In a separate ~ -
container, 31.90 parts by weight of propylene glycol,
1.70 parts by weight of 50~ potassium hydroxide, and
1.20 parts by weight of polyethylene glycol 5000 were
5 combined and heated to 125C. Two and seven-tenths
(2.70) parts by weight of dibenzylidene sorbitol was
feathered into the mixture and dissolved as described.
The aluminum chlorohydrex solution in the stainless
steel container was heated to 95C and added to the
solution in the separate container.
Five (5.00) parts by weight of deionized
water, 10.00 parts by weight of 0.5M potassium acid
phthalate and 1.50 parts by weight of 50~ potassium
hydroxide were combined, heated to 95C, and added to
the solution in the separate container. One (1.00) part
by weight of fragrance was added at 95C. The solution
was packed at 90C and allowed to cool. ;
The resulting clear gel antiperspirant stick
had a pH of 4.5. It had a very slight almond odor rated
at 2. The clarity of the resulting clear gel stick was
rated as 2. Salting was observed on storage.
.
~m~le 5
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 25.00 parts by
weight of propylene glycol as described. In a separate
container, 33.70 parts by weight of propylene glycol,
1.50 parts by weight of triethanolamine, and 1.20 parts
by weight of polyethylene glycol 5000 were combined and
heated to 125C. Two and one-half (2.50) parts by
weight of dibenzylidene sorbitol was feathered into the
mixture and dissolved as described. The aluminum
chlorohydrex solution in the stainless steel container
was heated to 95~C and added to the solution in the
separate container.
- 15 -
Thirteen and eight-tenths (13.80) parts by weight -
of deionized water, 0.40 parts by weight of lM citric
acid, and 0.90 parts by weight of lM sodium citrate were
combined, heated to 95C, and added to the solution in
the separate container. One (1.00) part by weight of
fragrance was added at 95C. The solution was packed at
90C and allowed to cool.
The resulting clear gel antiperspirant stick had a
pH of 4.2. It had a slight almond odor rated at 3. The
clarity of the resulting clear gel stick was rated at 2.
Salting was observed on storage.
Example 6
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 30.00 parts by
weight of propylene glycol as described. In a separate
container, 24.30 parts by weight of propylene glycol,
15.00 parts by weight of glycerine and 1.00 part by
weight of 99% triethanolamine were combined and heated
to 120C. Three (3.00) parts by weight of dibenzylidene
sorbitol was feathered into the mixture and dissolved as
described. The aluminum chlorohydrex solution in the
stainless steel container was heated to 90C and added
to the solution in the separate container.
Five (5.00) parts by weight of deionized water,
0.40 parts by weight of 99~ triethanolamine, 0.20 parts
by weight of monopotassium phosphate, and 0.10 parts by
weight of 1~ F, D & C Blue #1 in water were combined,
heated to 90C, and added to the solution in the
8eparate container. One (1.00) part by weight of
fragrance was added at 90C. The solution was packed at
85C and allowed to cool.
The resulting clear gel antiperspirant stick had a
pH of 4.7 and was light blue-green in color. It had a
no almond odor and was rated as 0. The clarity of the
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- 16 -
resulting clear gel stick was rated at 3. Salting was
observed on storage.
Example 7
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 30.00 parts by
weight of propylene glycol. In a separate container, ;~
19.30 parts by weight of propylene glycol, 15.00 parts
by weight of glycerine and 1.40 parts by weight of 99~ -
triethanolamine were combined and heated to 120C. Three
(3.00) parts by weight of dibenzylidene sorbitol was
feathered into the mixture with rapid stirring and
dissolved. The aluminum chlorohydrex solution in the
stainless steel container was heated to 90C and added
to the solution in the separate container.
Ten (10.00) parts by weight of deionized water,
0.30 parts by weight of 99% triethanolamine, 0.20 parts
by weight of 85% phosphoric acid, and 0.10 parts by
weight of 1~ F, D & C Blue #l in water were combined,
heated to 90C, and added to the solution in the
separate container. One (1.00) part by weight of
fragrance was added at 90C. The solution was packed at
85C and allowed to cool.
The resulting clear gel antiperspirant stick had a
pH of 4.5 and was light blue-green in color. It had a
threshold almond odor rated at 1. The clarity of the
resulting clear gel stick was rated at 1. Salting was
observed on storage.
E~ample 8
Twenty (20.00) parts by weight of aluminum _
chlorohydrex was rapidly stirred into 30.00 parts by
weight of propylene glycol. In a separate container,
19.3 parts by weight of propylene glycol, 15.00 parts by
weight of glycerine and 1.00 part by weight of 99
triethanolamine were combined and heated to 120C.
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- 17 -
Three (3.00) parts by weight of dibenzylidene sorbitol
was feathered into the mixture and dissolved. The
aluminum chlorohydrex solution in the stainless steel
container was heated to soC and added to the solution
in the separate container.
Ten (10.00) parts by weight of deionized
water, 0.40 parts by weight of 99% triethanolamine, `
0.20 parts by weight of monopotassium phosphate, and
0.10 parts by weight of 1% F, D & C Blue #1 in water
were combined, heated to 90C, and added to the solution
in the separate container. One (1.00) part by weight of
fragrance was added at 90C. The solution was packed at
85C and allowed to cool.
The resulting clear gel antiperspirant stick had a
pH of 4.7 and was light blue-green in color. It had a
slight almond odor rated at 3. The clarity of the
resulting clear gel stick was rated at 3. Salting was
observed on storage.
Example 9
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 30.00 parts by
weight of propylene glycol. In a separate container,
23.50 parts by weight of propylene glycol, 15.00 parts
by weight of glycerine and 1.40 parts by weight of 99
triethanolamine were combined and heated to 120C.
Three (3.00) parts by weight of dibenzylidene sorbitol
was feathered into the mixture with rapid stirring and
dissolved. The aluminum chlorohydrex solution in the
stainless steel container was heated to 90C and added
to the solution in the separate container.
Five (5.00) parts by weight of deionized water,
0.50 parts by weight of 99% triethanolamine, 0.50 parts
by weight of lactic acid, and 0.10 parts by weight of 1%
F, D & C Blue #1 in water were combined, heated to soc,
2 ~ 3 .~ ~
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- 18 -
and added to the solution in the separate container.
One (1.00) part by weight of fragrance was added at
so~C. The solution was packed at 85C and allowed to
cool.
The resulting clear gel antiperspirant stick had a
pH of 4.7 and was light blue-green in color. It had a
barely noticeable almond odor rated at 0.5. The clarity
of the resulting clear gel stick was rated at 1. Salting
was observed on storage.
Example 10
Twenty (20.00) parts by weight of aluminum
chlorohydrex was rapidly stirred into 25.00 parts by
weight of propylene glycol. In a separate container,
28.50 parts by weight of propylene glycol, 1.40 parts by
weight of 50% potassium hydroxide and 10.00 parts by
weight of polyethylene glycol 200 were combined and
heated to 125C. Three and two-tenths (3.20) parts by
weight of dibenzylidene sorbitol was feathered into the
mixture and dissolved as described. The aluminum
chlorohydrex solution in the stainless steel container
was heated to 95C and added to the solution in the
separate container.
Ten (10 00) parts by weight of deionized water,
0.30 parts by weight of lM citric acid, 0.60 parts by
weight of lM sodium citrate, and 0.1 parts by weight of
1% F, D & C Blue #l in water were combined, heated to -
95C, and added to the solution in the separate
container. One (1.00) part by weight of fragrance was
heated to 95C and added. The solution was packed at
90C and allowed to cool.
The resulting clear gel antiperspirant stick had a
pH of 4.7 and was light blue-green in color. It had a
threshold almond odor rated at 1. The clarity of the
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- 19 -
resulting clear gel stick was rated at 2.s. Saltiny was
not observed on storage.
As can be seen, the composition formulated in
accordance with the invention provides a stable, clear
gel antiperspirant stick with a sufficient amount of an
antiperspirant active agent to prevent perspiration. The
composition exhibits minimal decomposition; has minimal
odor and contains no volatile organic compounds.
It will thus be seen that the objects set
forth above, among those made apparent from the
preceding description, are efficiently attained and,
since certain changes may be made in the above
composition of matter without departing from the spirit
and scope of the invention, it is intended that all
matter contained in the above description shall be
interpreted as illustrative and not in a limiting sense.
It is also to be understood that the
following claims are intended to cover all of the
generic and specific features of the invention herein
described and all statements of the scope of the
invention which, as a matter of language, might be said
to fall therebetween.
Particularly it is to be understood that in
said claims, ingredients or compounds recited in the
singular are. intended to include compatible mixtures of
such ingredients wherever the sense permits.
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