DK158137B - deodorant stick - Google Patents

Description

in

DK 158137 B

The invention relates to a stable, saturated fatty acid soap-based deodorant stick containing alkali metal carbonate as the essential deodorant.

5 Cosmetic pins with antipyretic and / or deodorizing effects and based on alcoholic soap gels and / or other propylene glycol soap gels are known in the art and are described in U.S. Patent Nos. 2,900,306, 2,857,315, 2,933 .433, No. 3,259,545, and No. 2,970,083, Canadian Pat.

10 567,499 and British Patent Specification No. 795,773. The deodorizing agents which have heretofore been incorporated into said soap gels include halogenated dihydroxydiphenylmethanes, especially hexachlorophenes, as disclosed in U.S. Pat.

2,900,306 and 2,970,083.

15

In addition to or in place of said deodorants, antipyretic agents, such as sodium zirconium lactate, aluminum hydroxide gel, aluminum chloride hydroxy complex, aluminum hydroxychloride, sodium aluminum chlorohydroxylactate complex or mixtures thereof, are added to the aforementioned product = 2q 433, No. 3,259,545 and No. 2,970,083.

Antiperspirants combat armpit odors by inhibiting transpiration through the action of astringent salts, such as aluminum and zinc salts, and can be irritating to a significant number of users. 2 On the other hand, deodorants neutralize the unwanted odors caused by the breakdown of the sweat components due to of chemical and microbial attack to smelly fatty acids. Deodorants do not inhibit sweat production but, on the contrary, neutralize the smelly degradation products of sweat either by their own scent properties or by inhibiting the decomposing effect of microbial effects on the fats in the sweat residues or by reacting with the smelly fatty acids or of these mechanisms. Consequently, they are not as irritating as the antiperspirants, so-called antiperspirants.

Sodium bicarbonate has long been known for its deodorizing «properties and has been commonly used as a deodorizing 5» - * · 3 5 2

DK 158137 B

means in refrigerators. In addition, plain powdered sodium bicarbonate or diluted with talcum, corn starch, fismel or other fillers has been used as a deodorant for use under the arms as set out in Journal of Investigative Dermatology Vol. 71946, 5 pages 131-133 and U.S. Patent Nos. 279,195 and 1,558,405.

U.S. Patent Nos. 2,900,306 and 2,933,433, Norwegian Patent No. 56061, and on page 185 of "Seifen-Ole-Fette-Vach-se", 99 (1973) disclose a gel-shaped, ethanol-containing antipyrescent pin. which contains a stabilizing agent and a bactericide such as hexachlorophen, aluminum hydroxide and sodium aluminum chlorohydroxylactate. Such ethanol-containing gel pins cause problems regarding their stability and therefore must contain a stabilizer to prevent shrinkage of the pin.

U.S. Patent No. 2,857,315 discloses a propylene glycol / sodium stearate-containing gel pen which contains sodium zirconium lactate as a sweat-reducing agent. However, the gel pen gel and active ingredient are incompatible with each other.

Norwegian Patent Nos. 5,3255 and 55031 disclose the use of sodium bicarbonate in an ointment, and US Patent No. 2,177,055 discloses the use of sodium bicarbonate 25 in a soap base.

However, the development of a practical and effective deodorant composition in pin form that will be acceptable to consumers presents many special considerations. It can be said that because sodium 30 and potassium bicarbonate have only limited solubility in water, alcohol and other solvents, the preparation of a composition suitable for use in staple form has been an exceptionally difficult and complicated problem. In addition to the problem of limited solubility of the sodium bicarbonate, its compatibility with other constituents of conventional pin compositions, the dimensional stability of the pin containing sodium bicarbonate, its aesthetic appearance and how it feels on the skin are just a few additional problems that exist in connection with with the preparation of an acceptable sodium = bicarbonate-containing deodorant pin.

DK 158137 B

p

Accordingly, the object of the present invention is first and foremost to provide a fatty acid soap-based deodorant stick which does not shrink, does not shrink, and which contains an effective amount of an alkali metal bicarbonate as the active deodorizing agent, the bicarbonate removing the need for bacteriostats as the deodorizing agent. agent.

The invention thus relates to a deodorant pin comprising 0.1-15.0% of an alkali metal bicarbonate and 0-10% of a suspending agent dispersed in a soap-based gel comprising alcohol and gelled by a minor amount. of an alkali metal salt of a saturated fatty acid containing at least 14 and up to 20 carbon atoms, and the deodorant pin is characterized in that the soap-based gel comprises a polyhydric alcohol 15 or a mixture of a polyhydric alcohol and a monovalent alcohol, wherein the amount of the monovalent alcohol is not exceeds the amount of polyhydric alcohol.

The deodorant pin of the invention preferably comprises a smaller amount of sodium stearate, e.g. 2-15% by weight, as a gelling agent.

The alkali metal bicarbonate incorporated into the fatty acid soap based pin will generally be sodium bicarbonate.

25 It has been found that low concentrations of bicarbonate of up to approx. 3% can easily be dissolved in an aqueous solution in the preparation of a transparent pin. Higher concentrations of approx. 8% potassium bicarbonate can also be used in the preparation of solid deodorant pins. However, larger amounts of sodium or potassium bicarbonate, which amounts exceed their solubility limit, can also be incorporated into said pins using suspending agent and micropulverized sodium or potassium bicarbonate powder having a particle size of 5-100 µm and preferably 10-25µιη. . The smaller the parcels are, the easier they are suspended in the soap gel, and the resultant pin gives a grainier, smoother feel when applied to the skin.

4

DK 158137 B

Extra strength deodorant pins, ie. Consequently, containing more than 3% bi = carbonate can also be prepared by the addition of a suitable suspending agent, which are known volume-increasing compounds such as colloidal silica such as Cab-O-Sil® a pyrogenic silica having a particle diameter of between 0.001 and 0. , 03 µm, as disclosed in British Patent No. 987,301, colloid (fumed) alumina, finely divided hydrophobically treated clays such as a reaction product of a clay such as bentonite or hectorite with, for example, dimethyl distearyl = ammonium chloride, colloidal magnesium aluminum silicates, other 10 morillonite clays and hydrophobically treated montmorillonite clays.

The preferred suspending agents are the hydrophobically treated mont = morillonite or hectorite clays available under the trade name Bentone® and prepared by reacting a clay such as bento = 15 nite or hectorite in a cation exchange system with a variety of amines. Various amines are reacted to obtain different Bentone suspending agents which may also vary in SiC

MgO and A ^ O ^ r, all having a particle size below ca. 5 microns and marketed by NL Industries Inc. Suspension agents are used in amounts of 0.1-10% and preferably 0.5-2% by weight of the total mixture.

The transparency of the bicarbonate pin is reduced when the solubility of the bicarbonate in the soap gel is reduced because a portion of the bicarbonate is now in suspension, resulting in an opaque pin. These opaque sticks, which contain up to 15% bicarbonate, are very effective deodorant sticks and feel like a cream when applied to the skin, without affecting the stiffness properties of the sticks. Partial replacement of the bicarbonate with talcum provides an additional improvement in feel after the use of such pins.

It has further been found that the use of water-absorbent, insoluble filler materials in finely divided particulate form, such as talcum, corn starch and the like, instead of a portion of the bicarbonate content in an amount not exceeding bicarbonate.

DK 158137 B

s the amount of night, can also be incorporated into the soap-based gel pen to give the product a smooth character and / or water-absorbing properties. Such materials work by absorbing sweat under the armpit, which ensures a dry feel without altering the normal perspiration process.

It has also been found that sodium or potassium bicarbonate buffers and lowers the pH of the soap-based deodorant stick from 10 to 8.5-9 and 10.5 to 9.5, respectively, thereby possibly reducing skin sensitivity without the required hardness properties of the pin are adversely affected.

The sodium or potassium soap-based gel in which the aqueous bicarbonate solution or suspension is incorporated comprises a polyhydric alcohol or a mixture of a polyvalent and monovalent alcohol solidified or gelled by an alkali metal salt of a saturated fatty acid containing 14 -20 carbon atoms. Suitable polyhydric alcohols include glycerol and the lower molecular weight alkylene glycols which are liquid at room temperature such as ethylene = 20 glycol, diethylene glycol, butylene glycol and preferably propylene glycol. The alcohol content, which comprises the polyhydric alcohol and the monovalent alcohol (if included) (mainly constitutes the liquid constituent of the present material, from 20-76% by weight of the total material.

25

The monovalent alcohol which is a lower alkanol such as ethanol or isopropylal carbon may be used in place of a portion of the polyhydric alcohol and in an amount not exceeding the polyhydric alcohol. These combined alcohol-containing 30 pins are also effective as deodorant pins. However, the transparency of the alcoholic stick is significantly reduced, ie. said pins are opaque, not transparent or translucent. The use of ethanol as the sole alcohol base has been found to be undesirable due to its desiccant properties, viz. syneresis.

The polyhydric alcohol or the combination of ethanol with the polyhydric alcohol, especially propylene glycol *, is converted into a gel having a 6

DK 158137 B

solidifying component in known manner to form the solid cosmetic product. It is particularly preferred to use a stearic acid soap as the gelling agent which is formed preferably in situ by mixing aqueous alkali such as sodium or potassium hydroxide with a hot solution of stearic acid in propylene glycol or a mixture thereof with ethanol. The resulting mixture is solidified to a gel upon cooling. Any type of high molecular weight saturated fatty acid may be used, although it is preferred to use the commercial stearic acid which essentially comprises a mixture of stearic and palmitic acid. The solidifying agent is used in smaller amounts of approx. 2-15% and preferably approx. 4-8% by weight. Although a sodium, potassium or sodium potassium stearate can be used as a gelling agent, the sodium stearate is preferred.

In addition to the necessary components of the present product, smaller amounts of such components as perfumes, coloring agents, ultraviolet absorbents for enhancing color and the like may be included to enhance the aesthetic value and acceptability of the consumer.

Other minor constituents, if any, may be incorporated into the present composition without adversely affecting its beneficial properties such as the potassium, aluminum and amine soaps, emollients and emulsifiers such as silicones, fatty esters, fatty amides, fatty alcohols, ethoxylated fatty acids alcohols and acids.

These emulsifiers help to make the pins a melting pin, so that the pin contacts the skin upon contact with the skin. Preferred emulsifiers include alkoxylated cetyl alcohol, such as polypropylene glycol of the condensate of cetylal = alcohol with 20 moles of ethylene oxide, oleyl alcohol, ethoxylated lanolin, especially ).

Other optional ingredients which have a beneficial effect on the present deodorant stick are thickeners or viscosity builders, which alone or in combination with the suspending agents inhibit precipitation of materials before the gel solidifies. Particularly useful thickeners include cellulose derivatives such as hydroxyethyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose (CMC) 7

DK 158137 B

and Methocel®, which is a hydroxypropylmethylcellulose containing 23-32% hydroxypropyl groups, 16.5-20% methyl groups and approx. 5% NaCl with a viscosity of 4000-6000 centipoise, 5

Known bacteriostatic agents may also be added, although the bicarbonate-containing pin per se is effective as a deodorant without the use of added bacteriostatic agents.

The process for preparing the aqueous bicarbonate-containing deodorant pin generally comprises mixing an aqueous dispersion or solution of the bicarbonate plus suspending agent (when used), with a hot or heated solution of polyhydric alcohol, stearic acid and alkali metal hydroxide, preferably by ca. 71 ° C, followed by the addition of perfume, dyes and other optional ingredients (if included) to form a homogeneous liquid product. The hot liquid is then poured into molds and cooled to room temperature. During the cooling period, the gelling 20 takes place and the resulting product assumes a rigid form that can be applied to the skin by gently rubbing it over the skin, thereby depositing a thin film of said material on the desired areas of the skin. The resulting rigid pin is transparent or opaque depending on the amount of bicarbonate added and the particular ingredients used. The pin is stable, ie. there is no separation of specific constituents and it has a good storage resistance, ie, no syneresis occurs and it does not shrink.

Another method of preparing the aqueous bicarbonate-containing sticks comprises adding the powdered bicarbonate and filler such as talcum (if desired) directly to the hot liquid soap base with stirring, and pouring the hot liquid mixture into curing containers. deodorant sticks.

A preferred method of preparing said bicarbonate-containing pin is to combine the stearic acid with sodium carbonate or carbonate.

DK 158137 B

lium carbonate to form the sodium or potassium soap and sodium or potassium bicarbonate in situ. This reaction is shown by the following equation in which R represents the stearyl radical: 5 0 0

Il H

RC-0H + Na2CO3 -> RC-ONa + NaHCC> 3

The process for preparing the aqueous soap-based sticks 10 comprises dissolving alkali metal soaps such as the stearate in hot polyhydric alcohol containing a suspending agent, adding the bicarbonate thereto with stirring, followed by the addition of the water-absorbing materials, perfumes, staining agents, etc. and pouring the resulting mixture into containers for cooling and solidifying.

The following specific examples further illustrate the present invention. All amounts of the various constituents are by weight unless otherwise indicated.

20

Examples 1-5.

(sodium soap - propylene glycol - water based).

25

Eksempel_1_2_3_4_5

Part 1.

Propylene glycol 53.45 53.45 52.45 50.45 45.45

Stearic acid 6.00 6.00 6.00 6.00 6.00 30.1% Na 2 O Caustic soda 3.60 3.60 3.60 3.60 3.60

Part 2.

Deionized water 35.60 35.60 35.60 35.60 28.20

Sodium Bicarbonate - 0.1 0.1 3.0 Sodium Bicarbonate _ _ _ _ ιςηη (micropulverized) ~ 1 hour

Bentone® LT - - - - 0.50 9

DK 158137 B

Part 3.

Perfume 1.00 1.00 1.00 1.00 1.00 "Triclosan" (not, eg, trademark nin n, n

in DK) (bacteriostat) 1 U'10 ° 'iU U'1U U'iU

(ul? r «ioiet absorbed2 ° '05 ° '05 ° '05 ° '05 ° '05

Example_1_2_3_4_5 *

Part 4.

1 ° FDC Blue No. 1 0.1% 0.20 0.20 0.20 0.20 0.20 solution 100.00 100.00 100.00 100.00 100.00 partially irregular- Visual appearance see-through-see-through-see-through-view viscous opaque pH (10% aqueous solution) 10.32 9.7 9.1 8.9 8.5 20 1. 4.2 ', 4'-trichloro 2-hydroxydiphenyl ether.

2. 2,4-dihydroxybenzophenone.

The stearic acid and propylene glycol are mixed and heated to 7 ° C, followed by addition of the caustic soda.

2 5

Bentone ® is gradually added to the water under rapid and / or vigorous shear mixing, followed by the addition of the sodium = bicarbonate.

3 ° o o

The two solutions are mixed and cooled to 51 ° C - 54 ° C. Perfume, bacteriostat and uvinol ® are mixed and added to the above mixture followed by the addition of the coloring agent.

The combined mixture is poured into molds and cooled to solidify to stable deodorant pins.

These examples clearly show the buffering effect of the sodium bicarbonate as well as the improved transparency of the pin at concentrations of 0.1-3% bicarbonate content.

10

DK 158137 B

The pH measurements are made by dissolving 10 g of deodorant pin in 90 g of deionized water by heating and then cooling to room temperature before taking readings.

Examples 6 and 7.

(sodium soap - propylene glycol - ethanol - water based)

Example_6_7_ 10 Part 1.

Propylene Glycol 32.80 32.80

Ethanol (95%) 35.75 32.75

Stearic acid (B grade) 6.00 6.00 19.1% N 2 O caustic soda 3.60 3.60 15

Part 2.

Deionized water 20.00 20.00

Sodium bicarbonate - 3 "00 20"

Part 3.

Perfume 1.00 1.00

Triclosan (bacteriostat) 0.10 0.10

Uvinul ® 400 0.05 0.05 25 Butyl Stearate 0.50 0.50

Part 4.

FDC Blue No. 1 .0.1¾ aqueous solution 0.20 0.20 30 100.00 100.00

Visually looking opaque opaque opaque 35 pH 9.5 8.8

The same procedure as in Examples 1-5 is followed.

These examples also show the buffer effect of the bicarbonate in the presence of a mixture of ethanol and propylene glycol.

11

DK 158137 B

Examples 8 and 9.

(combination of stearic acid with sodium carbonate)

Example _ 8_9_ 5 Part 1.

Propylene glycol 53.45 52.60

Stearic acid (B grade) 6.00 6.00

Trichlorocarbanilide (TCC) 0.15 10

Part 2.

Deionized water 36.60 33.75

Sodium carbonate 2.40 2.40

Sodium bicarbonate ~ 3.00 Bentone ® LT “0.50

Methocel® (thickening agent) 1 - 0.40

Part 3.

Perfume 1.00 1.00 20 Uvinul ® 400 0.05 0.05

Triclosan (bacteriostat) 0.05

Part 4.

FDC Blue no. 1 0.1 aqueous solution 0.30 0.30 2.5 5.00 100.00

Visual appearance transparent transparent 30 pH (10% aqueous solution) 9.0 8.8 1. Hydroxypropyl methylcellulose.

Part 1 is prepared by heating and dissolving TCC and the stearic acid in prc pylene glycol at 71 ° C.

Part 2 is prepared by dissolving the sodium carbonate and / or sodium = the bicarbonate in water with stirring and heating to 71 ° C. Methoce® is gradually added with vigorous stirring followed by

DK 158137 B

got some addition of Bentone.

Part 1 is gradually added to part 2 and cooled to approx. 54 ° C.

5 Part 31 s constituents are mixed and added to the above liquid mixture followed by the addition of the color. This homogeneous mixture is poured into molds and cooled.

These examples are specific to the preferred process for forming the sodium bicarbonate in situ by the addition of stearic acid to the sodium carbonate. The pin containing less than 3% bicarbonate is transparent, whereas the larger amount of bicarbonate provides an opaque pin.

In Example 9, the total amount of sodium bicarbonate formed exceeds the solubility thereof in the system, so that the excess amount precipitates as fine particles on the BentonevS? Suspension agent.

Examples 10-12.

20

Eksempel_1Ό_11_12_

Propylene glycol 53.45 53.45 53.45

Stearic acid 6.00 6.00 6.00 TCC 0.15 0.15 0.15 25 Deionized water 33.50 33.40 33.40

Caustic soda (19.1%) 3.60 3.60 3.60

NaCl - 0.1

Sodium bicarbonate - - 0.1

Diisopropyl adipate 1.0 1.0 1.0 Benzyl alcohol 1.0 1.0 1.0

Lavender 1.0 1.0 1.0 FDC Blue No. 1 (0.1¾) 0.2 0.3 0.3

Uvinul® 400 0.05 0.05 0.05 DP 300 0.05 0.05 0.05 35

Example 12 is significantly more transparent than Examples 10 and 11 and retains its transparency after 20 minutes at 18 ° C in a freezer, whereas the other pins become slightly cloudy after freezing, demonstrating the better stability of the bicarbonate-containing pin. Example 12 also retains its transparency after Stage 13

DK 158137 B

overnight, whereas the other pins become less transparent.

Examples 13 and 14.

Cream Founder.

5

Eksempel_13_14

Base A C

Part 1.

Propylene Glycol 55.00 75.73

Stearic acid 6 00 (double pressed quality) '

Stearic Acid _ 5 00 (Triple Pressed Quality) Λ c Bentone ^ LT 2.00 1.00 1 o

Saturated fatty acid - 1.00

Part 2.

Water 26.48 10.00 20 Sodas (sodium carbonate) 2.40 2.37

Part 3.

Perfume 1.00 1.00

Glycerol Monostearate - 0.50 2 5 1

Procetyl AWS (emulsifier) 7.00 3.00 D&C Green 8 (2.75¾) 0/08 FDC Green 3 (0.1%) 0.04 D&C. Red 19 (0.1%) - 0.40 30 100.00 100.00 50% cream pencil 50% cream pencil

Base A Base C

3- 50% baking soda 25% baking soda (micropul- (micropulverized) verified) 25% Italian talcum 100% 100% 14

DK 158137 B

1. Polypropylene glycol (5 moles) of cetyl alcohol condensate with 20 moles of ethylene oxide.

The components of Part 1 are mixed and heated to .71 ° C and added to the aqueous solution of Part 2 at 71 ° C.

The microp powdered baking soda per se or together with the talcum powder is mixed with the hot liquid cream base at a temperature of at least

10 Q

51..C. The hot pourable mixture is poured into containers and cooled to form a solid pin. These very firm deodorant pins are distributed on the skin like a cream. The talcumbage soda pins give a particularly smooth feel when rubbed on the skin.

15

Examples 15 and 16.

(Use of potassium bicarbonate)

Example_15_16_ 20 Part 1.

Propylene glycol 52.30 44.30

Sodium stearate 8.00 8.00

Procetyl AWS 3.00 3.00 25

Part 2.

Deionized water 35.00 35.00

Potassium bicarbonate 0.00 8.00 30 The - * - 3.

Sodium chloride 0.20 0.20

Perfume 1.50 1.50 100.00 100.00 35

Appearance partially transparent transparent transparent to transparent to transparent pH (10% aqueous solution) 10.5 9.5 15

DK 158137 B

Sodium stearate and procetyl AWS are dissolved in hot propylene glycol at ca. 82 ° C. Potassium bicarbonate is dissolved in hot deionized water. Part 2 is added to part 1 while mixing and the components of part 3 are mixed.

The results show the buffer effect of potassium bicarbonate and its usefulness at 8% in solution.

Example 17

Example 17 10 -k .-- (Anhydrous pin)

Propylene glycol 75.80

Sodium stearate 8.00

Procetyl AWS 4.00 Sodium bicarbonate (microp powder) 10.00

Bentone ® LT 0.50

Perfume 1.50 FDC Green Nr. 3 (0.1% in ethanol) 0.20 100.00 20

Appearance Greenish opaque (extremely aesthetic)

(S

Bentone® LT is dispersed in propylene glycol and procetyl AWS solution under vigorous mixing. Sodium stearate is dissolved in the mixture at ca.

25 n n 85 C .. The temperature is reduced to 71 ° C and the sodium bicarbonate powder mixed with perfume and color. The product is poured into containers and cooled to form a solid pin.

Example 18.

30 -c- (using glycerol instead of propylene glycol)

Eksempel_18_

Part 1.

Glycerol 50.00 35 Stearic acid (double pressed quality) 6.00

Part 2.

Deionized water 35.83

Sodium ash (sodium carbonate) 2.40 16

DK 158137 B

Part 3.

Perfume 1.50

Triclosan (bacteriostat) 0.15 Procetyl AWS 4.00 D&C Green no. 8 '(2-, 75¾) 0.08 FDC Green No-4 3 (0.1¾) 0.04 100.00 10 appearance transparent

Part 1 is prepared by dissolving stearic acid in glycerine at 7 ° C.

Part 2 is prepared by dissolving soda ash in deionized water at 71 ° C. 15

Part 1 is gradually added to part 2 under mixing and cooled to 62 ° C.

Part 3 ingredients are mixed and the solution is poured into containers and cooled to form a solid pin.

Other polyhydric alcohols can be used instead of propylene glycol partially or completely in the above examples, such as ethylene glycol, butylene glycol, etc. The ethanol can also be replaced with 25 other monovalent alcohols such as isopropyl alcohol. Other fatty acid = soaps can also be used instead of stearate soap.

All the bicarbonate-containing pins have been found to be a highly effective deodorant without the use of bacteriostatic agents, as well as being stable, non-stinging and non-shrinking.

Example 19.

The following tests were performed to demonstrate the peculiarity and surprising properties of the present deodorant pins which include alkali metal bicarbonate as deodorant.

17

DK 158137 B

A. Various active deodorizing / anti-transparent constituents were examined to determine their compatibility in a deodorant pin which included propylene glycol / sodium stearate.

The following active ingredients were tested at a 5% concentration in the pin.

A. Sodium bicarbonate.

B. Potassium bicarbonate.

10 C. Ammonium bicarbonate.

D. Zinc castor oleate.

E. Aluminum Chlorohydrate.

F. 2 parts "Beckanol" (unregistered trademark in Denmark) Z aluminum chlorohydrate, 1 part zirconyl hydroxy chloride (2 parts A120H5C1, 2.33 H2 O + 1 part 20 ZrO (OH) (Cl, 3H20).

G. Zinc phenol sulfonate.

The pin included: 25 Water 34.36%

Propylene glycol 52.31%

Bentone® LT 0.50%

4.33% sodium stearate

Procetyl AWS 3.00% Perfume 0.50%

The water and propylene glycol were mixed with each other. The Bentone® used was added with stirring and heating to 60 ° C. The active ingredient was then added and heated to 71 ° C, then the sodium stearate was added and mixed until dissolved. "Procetyl AWS" was added which was mixed and cooled to ca. 60 ° C. Perfume 18

DK 158137 B

was finally added and the mixture was cooled in a water bath to solidify.

The following observations were made after cooling and during preparation.

Sample A.

This one formed a reasonably hard pin with good aesthetic properties. There were no difficulties during the manufacturing process. Some bicarbonate was suspended.

Sample B.

15 This was a somewhat softer stiff than A, but of good quality.

No difficulties arose during manufacture. All bicarbonate was apparently dissolved.

Sample C.

20

Heavy foaming occurred during the release of ammonia as the ammonium bicarbonate was added. The salt was apparently completely decomposed during the release of ammonia and CO2 from the hot solution.

25

Sample D.

A cheese-like substance was formed during preparation and the mixture was liquid after cooling. The active ingredient 30 was incompatible.

Sample E.

A cheese-like substance was formed in the same manner as for samples D, 35 and without solidification. The active ingredient was also incompatible.

19

DK 158137 B

Sample F.

A cheese-like substance was also formed in the solution. No solidification took place. The active ingredient was also incompatible.

Sample G.

A cheese-like substance formed in the solution. No solidification 10 occurred. The active ingredient, zinc phenol sul phonate, was also incomparable.

A sample H which comprised 35.03% water, 52.31% propylene glycol, 0.5% Bentone® LT, 4.33% sodium stearate, 3.0% Procetyl AWS, 0.5% perfume and 4, 33% ZrOCl2, 6H2O as the active ingredient, was prepared by the same method used for the samples AG. No solidification of the sample H occurred and a cheese-like substance was present in the formed liquid, which also suggested that the active ingredient was incompatible.

20

Thus, it can be concluded that only sodium or potassium bicarbonate were compatible as deodorizing agents in a sodium soap-based deodorant pen comprising a polyhydric alcohol.

These results clearly show the peculiar and surprising compatibility properties of the sodium and potassium bicarbonate, and these properties are not exhibited by various known, known, active deodorizing agents / antitransparent agents, but these properties are necessary in the preparation of a deo-3Q dorant pin. .

B. Comparative experiments were performed with the following deodorant pins on evaporation rates to examine their stability upon standing, i.e. the storage stability of the product, which has a significant impact on whether the product 3 & aesthetically acts on the users.

20

DK 158137 B

Pin with a propylene type pin. U.S. Pat. Nos. Alcoholic Tent No. Carbonate Bicar- 2,900,306 and Acc. oponate alcohol * finding stiff,

Component weight% weight% weight% SD 40 alcohol 83.0 - 58.5 Sodium stearate 7.0 4.33 5.0

Deionized water 5.0 34.32 20.0

Bentone® LT - 0.50 2.0

Sodium Bicarbonate - 10.00 10.0 "Triclosan" ("DP-300)" 0.5 Propylene Glycol 3.0 46.00 3.0

Perfume 1.5 1.50 1.5

Colorant - 0.110 "Procetyl AWS" - 3.0

Preservative - 0.2 20 _

Evaporation loss in grams 18.8 3.0 8.4

Standing (hours) 24 24 16 25 Condition after standout Heavy Ratio Shrinkage shrinkage show little observed, shrinkage observed Hard over- (both downward face and inward) due to 30 drying out during sight-travel.

35 * The myristate salt was not added as the stability of the pin is attributed to the presence of this salt (see US Patent Specification, column 2, lines 27-33).

Claims (5)

A deodorant stick comprising 0.1-15.0% of an alkali metal bicarbonate and 0-10% of suspension dispersed in a soap-based gel comprising alcohol and gelled by a minor amount of an alkali metal salt of a saturated fatty acid containing at least 14 and up to 20 carbon atoms, characterized in that the soap-based gel comprises a polyhydric alcohol or a mixture of a polyhydric alcohol and a monovalent alcohol, wherein the amount of the monovalent alcohol does not exceed the amount of the polyhydric alcohol. 2. Deodorant pin according to claim 1, characterized in that the polyhydric alcohol is selected from glycerol and lower molecular weight glycols liquid at room temperature, and the monovalent alcohol is a lower alkanol, said total alcohol amount being 20%. 76% by weight. Deodorant pin according to claim 1 or 2, characterized in that the polyhydric alcohol is propylene glycol and the monovalent alcohol is ethanol. DK 158137B Deodorant pin according to claims 1-3, characterized in that the polyhydric alcohol is 20-76% propylene glycol. 5 10 15 20 25 30 35