Deodorant cosmetic stick composition

This invention provides a deodorant cosmetic stick product which has a translucent or transparent light transmitting appearance. The cosmetic stick has a content of ingredients such as propylene glycol, sodium stearate, dimethicone copolyol, Triclosan, Pentadoxynol-200, and water. An invention deodorant cosmetic stick has excellent esthetics when applied underarm, such as smoothness and a comfortable dry feel, and without a visually perceptible residue.

CROSS-REFERENCE TO RELATED APPLICATIONS 
The subject matter of this patent application is related to that disclosed 
in copending patent application Ser. No. 08/503,939, filed Jul. 19, 1995; 
Ser. No. 08/526,269, filed Sep. 13, 1995; and Ser. No. 08/534,819, filed 
Sep. 27, 1995. 
BACKGROUND OF THE INVENTION 
Numerous solid antiperspirant and/or deodorant compositions have been 
described in the chemical and cosmetic literature. These compositions 
generally are emulsion sticks or suspensoid sticks. Emulsion sticks 
contain a solution of the antiperspirant ingredient incorporated into the 
stick via an emulsion. Although emulsion sticks are desirable in certain 
respects, they tend to be unstable, exhibit tackiness, and leave a visible 
residue on the skin after use. Suspensoid sticks contain the powdered 
antiperspirant ingredient suspended in the stick without the use of water 
or an emulsion. While suspensoids have stability, they tend to leave a 
white chalky residue on the skin after application. 
With respect to deodorant activity, sodium bicarbonate has long been 
recognized for its deodorant properties, and has commonly been used as a 
household deodorant. Plain powdered sodium bicarbonate, or sodium 
bicarbonate diluted with talc or other filler, has been used as an 
underarm deodorant as disclosed in U.S. Pat. No. 4,382,079. Other 
publications which describe cosmetic stick compositions containing a 
bicarbonate deodorant include U.S. Pat. No. 4,822,602 and U.S. Pat. No. 
4,832,945. 
However, the development of a practical and effective composition in 
cosmetic stick form which has a deodorization capacity, and which is 
capable of consumer acceptability, presents many factors which are unique. 
Because sodium and potassium bicarbonate have only limited solubility in 
water, alcohol and other solvents, the preparation of a composition 
suitable for dispensing in cosmetic stick form has involved many 
processing obstacles. In addition to the problem of limited solubility, 
sodium bicarbonate often is incompatible with other ingredients of 
conventional stick compositions. Also, the dimensional stability of the 
cosmetic stick containing sodium bicarbonate, and the esthetic appearance 
and the "feel" on the skin, are just a few of the additional difficulties 
encountered in the preparation of a low residue deodorant cosmetic stick 
product. 
A recent trend is toward the development of cosmetic sticks which have 
light transmitting properties, i.e., the cosmetic sticks are translucent 
or transparent in light transmitting properties, and engender a perceived 
appearance of purity. 
Cosmetic sticks which are soap-based and which have a content of sodium 
bicarbonate as a deodorant ingredient typically are opaque in appearance. 
U.S. Pat. No. 4,440,742 describes anhydrous and water-based deodorant 
cosmetic sticks which contain sodium bicarbonate, and which vary from 
opaque to transparent in appearance as determined by the proportions of 
sodium bicarbonate and water, in combination with other ingredients. 
There are difficulties associated with the preparation of water-based 
cosmetic stick products which contain sodium bicarbonate as a deodorant 
ingredient. Thus, the transparency properties do not have long-term 
stability. Acceptable degrees of hardness and smoothness are not readily 
achieved, and an unpleasant cool-wetness is experienced when the cosmetic 
stick is applied to a skin surface. 
There is continuing interest in the development of water-based deodorant 
cosmetic stick products which have a high degree of consumer acceptance. 
Accordingly, it is an object of this invention to provide a cosmetic stick 
product which is a water-based bicarbonate-free composition having an 
effective deodorizing content of a bacteriostat ingredient. 
It is another object of this invention to provide a deodorant cosmetic 
stick product having stable transparency and affording a comfortable dry 
feel when applied to a skin surface. 
Other objects and advantages of the present invention shall become apparent 
from the accompanying description and examples. 
DESCRIPTION OF THE INVENTION 
One or more objects of the present invention are accomplished by the 
provision of a deodorant cosmetic stick product with transparency which 
comprises (1) about 40-70 weight percent of polyhydric alcohol ingredient, 
(2) about 2-8 weight percent of hydrophilic silicone-polyol 
clarifier-surfactant ingredient, (3) about 3-10 weight percent of C.sub.14 
-C.sub.22 fatty acid salt ingredient, (4) about 0.01-0.5 weight percent of 
bacteriostat ingredient, and (5) about 24-64 weight percent of water; 
wherein the weight ratio of water:silicone polyol ingredients is between 
about 3-12:1, and wherein the deodorant stick product has a penetration 
value between about 2-6. 
The term "transparency" as employed herein refers to invention cosmetic 
stick products which have translucent or transparent light transmitting 
properties. 
The term "transparent" refers to a clear body which has the property of 
transmitting light without appreciable scattering, so that objects beyond 
are entirely visible. 
The term "translucent" refers to a body which is partly transparent. The 
body admits and diffuses light, so that objects beyond cannot be clearly 
distinguished. 
The term "opaque" refers to a body which is impervious to visible light. An 
opaque body lacks any degree of transparency. 
The polyhydric alcohol ingredient is selected from organic compounds which 
contain about 2-6 carbon atoms, and about 2-6 hydroxy groups. Illustrative 
of polyhydric alcohols are ethylene glycol, propylene glycol, trimethylene 
glycol, butylene glycol, diethylene glycol, dipropylene glycol, glycerin, 
sorbitol, and the like, and mixtures thereof. Preferred polyhydric 
alcohols are those which are water-miscible in all proportions such as 
ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 
and glycerin. 
An essential aspect of a present invention cosmetic stick product is a 
content of a hydrophilic silicone-polyol clarifier-surfactant ingredient. 
The silicone-polyol ingredient is selected from a specific structural type 
of silicone nonionic surfactant polymers, having multiple polyoxyalkylene 
sidechains which impart hydrophilic properties to the clarifier-surfactant 
ingredient. 
The term "hydrophilic" as employed herein refers to a water-dispersible 
silicone-polyol ingredient which has a water-solubility of at least about 
two grams per one hundred grams of water at 25.degree. C. 
Illustrative of hydrophilic silicone-polyol clarifier-surfactant 
ingredients are dimethicone copolyol type of polymers, which include 
commercial products such as Dow Corning 193, GE SF-1288, Abil B 8847 
(Goldschmidt), Alkasil NE 58-50 (Rhone-Poulenc), Amersil DMC-287 
(Americol), KF 353A (Shin Etsu), Masil i066D (PPG/Mazer), Silicone 
Copolymer F-754 (Wacker), Sibwet L-7000 (Union Carbide), and the like; and 
similar hydrophilic silicone-polyols as listed in the CFTA International 
Cosmetic Ingredient Dictionary (Fourth Edition), incorporated by 
reference. 
The hydrophilic silicone-polyol clarifier-surfactant ingredient contributes 
important advantages to a present invention cosmetic stick product. The 
silicone-polyol ingredient enhances the transparency of the cosmetic 
stick, and stabilizes the degree of clarity over an extended period of six 
months or longer under normal storage and usage conditions. 
The silicone-polyol ingredient has a gelling effect, and increases the 
hardness of the cosmetic stick. The silicone polyol ingredient also 
functions as a compatibility enhancing agent, which improves the 
homogeneity of the diverse inorganic and organic constituents in the solid 
matrix. 
Other advantages of the silicone-polyol ingredient are apparent when an 
invention cosmetic stick product is applied to an underarm skin area. 
There is ease and smoothness of application, because of the physical 
glidability of the silicone-polyol ingredient. There is an improvement in 
other esthetic values as well, such as a reduction in the unpleasant 
cool-wetness typical of cosmetic stick usage. The silicone-polyol 
ingredient also is a contributing factor to the absence of a visually 
perceptible residue as characteristic of a present invention cosmetic 
stick product after application. 
Because of the absence of a bicarbonate salt ingredient, a present 
invention cosmetic stick product can exhibit excellent clarity and 
dimensional stability, and provide improved esthetic appearance and 
"feel". 
A present invention cosmetic stick product includes a hardener ingredient, 
which preferably is selected from C.sub.14 -C.sub.22 fatty acid salts. 
Suitable fatty acid salts include alkali metal, alkaline earth metal, 
aluminum, ammonium and amine salts of fatty acids such as myristic, 
palmitic, stearic, behenic, oleic, linoleic, linolenic, and the like, and 
mixtures thereof. Illustrative of specific fatty acid salts are sodium 
stearate, potassium stearate, aluminum monostearate, sodium oleate, sodium 
palmitate, sodium behenate, diethylamine stearate, triethylamine stearate, 
triethylamine oleate, and the like. 
A present invention cosmetic stick product also includes between about 
0.01-0.5 weight percent, preferably about 0.1-0.4 weight percent, of a 
bacteriostat ingredient. The bacteriostat functions as a deodorant by 
preventing bacterial generation of malodorous degradation byproducts from 
perspiration. Typical bacteriostatic compounds include Triclosan 
(Ciba-Geigy), Chloracel (Reheis Chemical Company), zinc phenolsulfonate, 
dichloro-m-xylenol, sodium N-lauroyl sarcosine, and the like. 
A present invention cosmetic stick product can contain one or more optional 
ingredients such as clarifying agents, antiperspirants, fragrances, 
colorants, and the like. 
Between about 0.5-5 weight percent of a clarifying agent can be included as 
an optional ingredient. Suitable clarifying agents include 
Pentadoxynol-200 (RTD Chemicals Corp.), tetra(hydroxypropyl)diamine 
(Quadrol, BASF), 2-amino-2-methylpropanol (AMP, Angus Chemical Company), 
2-amino-2-hydroxymethyl-1,3-propanediol (Tromethamine, Sigma Chemical 
Company), and the like. 
Between about 0.1-3 weight percent of a fragrance can be included as an 
optional ingredient. The selected fragrance ingredient is one which does 
not adversely affect the clarity of the cosmetic stick product, and 
preferably which contributes an odorant masking effect. Fragrances 
typically are organic compounds of specific type structures, which include 
phenolic materials, essential oils, synthetic oils, aldehydes and ketones, 
polycyclic compounds, esters, and alcohols. Specific fragrances are 
illustrated by linalyl acetate, isopropyl myristate, cedryl acetate, 
myrcenyl acetate, and other compounds such as those listed in U.S. Pat. 
No. 5,114,717; incorporated by reference. 
Between about 0.005-0.0025 weight percent of a colorant can be included as 
an optional ingredient. Typical colorants are exemplified by FD&C-type 
dyes and lakes as illustrated in the Examples. 
A present invention deodorant cosmetic stick product can be produced by 
blending the ingredients in a prescribed order of addition. 
In a general procedure, the silicone-polyol, fatty acid salt, bacteriostat 
and optional ingredients are added to propylene glycol with heating to 
form a solution. The propylene glycol solution then is blended with water 
at about 90.degree. C. to form a homogeneous liquid medium. The warm 
liquid medium is poured into molds, and the molded units are cooled to 
room temperature to form rigid structures. 
The hardness of a present invention cosmetic stick can have a value which 
varies in the range between about 2-6, and preferably is in the range 
between about 2.3-3.3. 
The penetration values (in millimeters) of the cosmetic stick products 
described herein are measured with a Universal Penetrometer, Model 
TS-73510 AN-2 (Precision Scientific Inc.). 
The penetration values are obtained by following a standardized procedure 
in accordance with ASTM Method D217-94.

The following examples are further illustrative of the present invention. 
The components and specific ingredients are presented as being typical, 
and various modifications can be derived in view of the foregoing 
disclosure within the scope of the invention. 
EXAMPLE I 
This Example illustrates the preparation of a translucent deodorant 
cosmetic stick product in accordance with the present invention. 
______________________________________ 
Ingredients Weight percent 
______________________________________ 
Part 1 
D.I. water 35.00 
Part 2 
propylene glycol 50.27 
Irgasan DP300.sup.(1) 
0.28 
Dow Corning 193.sup.(2) 
4.00 
Part 3 
Clarit PDP-200.sup.(3) 
2.50 
OP-100V.sup.(4) 6.00 
Part 4 
D&C Green #5 (0.1% solution) 
0.50 
fragrance.sup.(5) 1.45 
______________________________________ 
.sup.(1) Triclosan (CibaGeigy). 
.sup.(2) Hydrophilic dimethicone copolyol. 
.sup.(2) Pentadoxynol200 (RTD Chemicals Corp.). 
.sup.(4) Sodium stearate (RTD Chemicals Corp.). 
.sup.(5) Sobica Deofresh RH 1160 Mod (Takasago). 
The triclosan and dimethicone copolyol are added to the propylene glycol, 
and the mixture is heated to 90.degree. C. The Part 3 ingredients are 
added to the propylene glycol, and heating at 90.degree.-105.degree. C. is 
maintained until a solution is formed. 
The propylene glycol solution and water are blended, and the colorant and 
fragrance ingredients are blended with the liquid medium 
(65.degree.-70.degree. C.). 
The fluid blend is poured into Plastek 2 oz. bottom-fill cosmetic stick 
containers. The container contents are cooled to a room temperature solid 
stick over a period of 45 minutes. The solid stick is translucent in light 
transmitting appearance, and has an average hardness value of 2.4 
millimeters (ASTM Method 217-94). 
EXAMPLE II 
This Example illustrates the preparation of a transparent deodorant 
cosmetic stick product in accordance with the present invention. 
______________________________________ 
Ingredients Weight percent 
______________________________________ 
Part 1 
D.I. water 40.00 
Part 2 
propylene glycol 41.77 
dipropylene glycol 3.00 
Irgasan DP300.sup.(1) 
0.28 
Dow Corning 193.sup.(2) 
5.00 
Part 3 
Clarit PDP-200.sup.(3) 
3.00 
OP-100V.sup.(4) 5.00 
Part 4 
D&C Green #5 (0.1% solution) 
0.50 
fragrance.sup.(5) 1.45 
______________________________________ 
.sup.(1) Triclosan (CibaGeigy). 
.sup.(2) Hydrophilic dimethicone copolyol. 
.sup.(3) Pentadoxynol200 (RTD Chemicals Corp.). 
.sup.(4) Sodium stearate (RTD Chemicals Corp.). 
.sup.(5) Sobica Deofresh RH 1160 Mod (Takasago). 
The ingredients are blended in the manner described in Example I to form a 
batch of packaged cosmetic stick products. 
The solid stick is transparent in light transmitting appearance, and has an 
average hardness value of 2.9 millimeters (ASTM Method D217-94). 
EXAMPLE III 
This Example illustrates the preparation of a translucent deodorant 
cosmetic stick product in accordance with the present invention. 
______________________________________ 
Ingredients Weight percent 
______________________________________ 
Part 1 
D.I. water 35.00 
Part 2 
propylene glycol 50.27 
Irgasan DP300.sup.(1) 
0.28 
GE SF-1288.sup.(2) 4.00 
Part 3 
Clarit PDP-200.sup.(3) 
2.50 
OP-100V.sup.(4) 6.00 
Part 4 
D&C Green #5 (0.1% solution) 
0.50 
fragrance.sup.(5) 1.45 
______________________________________ 
.sup.(1) Triclosan (CibaGeigy). 
.sup.(2) Hydrophilic dimethicone copolyol. 
.sup.(3) Pentadoxynol200 (RTD Chemicals Corp.). 
.sup.(4) Sodium stearate (RTD Chemicals Corp.). 
.sup.(5) Sobica Deofresh RH 1160 Mod (Takasago). 
The ingredients are blended in the manner described in Example I to form a 
batch of packaged cosmetic stick products. 
The solid stick is translucent in light transmitting appearance, and has an 
average hardness value of 2.4 millimeters (ASTM Method D217-94). 
EXAMPLE IV 
This Example illustrates the preparation of a transparent deodorant 
cosmetic stick product with an increased bicarbonate content in accordance 
with the present invention. 
______________________________________ 
Ingredients Weight percent 
______________________________________ 
Part 1 
D.I. water 42.00 
Part 2 
propylene glycol 37.77 
glycerin 5.00 
Irgasan DP300.sup.(1) 
0.28 
GE SF-1288.sup.(2) 4.00 
Part 3 
Clarit PDP-200.sup.(3) 
4.00 
OP-100V.sup.(4) 5.00 
Part 4 
D&C Green #5 (0.1% solution) 
0.50 
fragrance.sup.(5) 1.45 
______________________________________ 
.sup.(1) Trichlosan (CibaGeigy). 
.sup.(2) Hydrophilic dimethicone copolyol. 
.sup.(3) Pentadoxynol200 (RTD Chemicals Corp.). 
.sup.(4) Sodium stearate (RTD Chemicals Corp.). 
.sup.(5) Sobica Deofresh RH 1160 Mod (Takasago). 
The ingredients are blended in the manner described in Example I to form a 
batch of packaged cosmetic stick products. 
The solid stick is transparent in light transmitting appearance, and has an 
average hardness value of 3.1 millimeters (ASTM Method D217-94).