SE444643B - Bicarbonate-containing deodorant rod - Google Patents

Description

7810837-0 in U.S. Patents 2,857,315, 2,933,433, 3,259,545 and 2,970,083.

Antiperspirants combat odor from the armpits by inhibiting sweating through the action of astringent salts, such as aluminum and zinc salts, and can be irritating to a significant number of users. In other words, deodorants neutralize the remarkable odors that result from the breakdown of constituents in sweat into foul-smelling fatty acids due to chemical and microbial effects. The deodorants do not prevent sweating, but rather neutralize the foul-smelling degradation products of sweat, either by their own odor properties or by inhibiting the decomposition effect of the microbial effect on the fats in the sweat residues or by reaction with the foul-smelling fatty acids or by a combination of these mechanisms. Consequently, they are not as irritating as the antiperspirants.

Sodium bicarbonate has long been recognized for its deodorant properties and has been widely used as a deodorant in cold rooms. In addition, ordinary powdered sodium bicarbonate or diluted with talc, corn starch, rice flour or other filler has been used as an forearm deodorant as stated in the "Journal of Investigative Dermatology" Vol. 71946, p. 131-133 and in U.S. Patents 279,195 and 1,558,405.

The development of a practical and effective deodorant composition in bar form, which is accepted by the consumer, is faced by many. peculiar considerations. In other words, since sodium and potassium bicarbonate have only limited solubility in water, alcohol and other solvents, the preparation of a composition suitable for dispensing in rod form has been an extremely difficult and complicated problem. In addition to the problem of limited solubility of sodium bicarbonate, its compatibility with the other constituents of conventional compositions in bar form, the dimensional stability of the bar containing sodium bicarbonate, its aesthetic appearance and sensation on the skin, are just some of the additional problems which are present. 0 associated with the manufacture of an acceptable sodium bicarbonate-containing deodorant rod.

Accordingly, a principal object of the present invention is to provide a non-shrinking, non-scorching, stearate soap-based deodorant rod which contains an effective amount of an alkali metal bicarbonate as the active deodorant, the bicarbonate eliminating the need for bacteriostats as odor enhancers.

In accordance with the present invention, it has been found that a deodorant bar comprising at least 0.1 to 3% by weight and preferably at least 1 to 3% by weight, and up to 70% by weight, and preferably up to 50% by weight of an alkali metal bicarbonate dispersed or dissolved in water aqueous or anhydrous polyhydric alcohol by itself or in admixture with a monohydric alcohol which has been solidified with a small amount of sodium stearate or a combination of sodium and potassium stearates, has certain desirable properties.

The deodorant rod of the present invention is characterized in that it comprises at least 0.1 ~ 3 and up to 70% by weight of alkali metal bicarbonate as the main deodorant substance and 0 - 10% by weight of suspending agent, dispersed or dissolved in a polyhydric alcohol selected from the group consisting of glycene. and lower molecular weight lower alkylene glycols which are liquid at room temperature, or a mixture of a polyhydric alcohol and a lower alkanol solidified by 2 to 15% by weight of an alkali metal salt of a saturated C14 - C20 fatty acid gelling agent, which alcohol content constitutes 20 - 90% by weight of the total composition.

The alkali metal bicarbonate, which is included in the fatty acid soap-based rod, is generally sodium bicarbonate or potassium bicarbonate. It has been found that low levels of bicarbonate, up to about 3%, can be easily dissolved in an aqueous solution when preparing a transparent rod. Higher levels of about 8% potassium bicarbonate can also be used in the preparation of solid deodorant rods. However, larger amounts of sodium or potassium bicarbonate outside their range of solubility may also be incorporated into said rods using a suspending agent and micropulverized sodium or potassium bicarbonate powder having a particle size of about 5 to 100 microns and preferably 10 to 25 microns. The smaller the particles, the lighter it is to suspend them in the soap gel and the resulting bar gives a non-grainy, smoother feeling when applied to the skin.

The extra strong deodorant rods, ie. consequently, containing more than 3% of bicarbonate, can also be prepared by adding a suitable suspending agent, which are known compounds which act as bulking agents, such as colloidal silica, such as "Cab-O-Sil"; a fumed silica having a particle diameter between about 0.001 and 0.03 microns as disclosed in British Patent 987,30l; colloidal (evaporated) alumina; finely divided hydrophobically treated clays such as a reaction product of a clay such as bentonite or hectorite , with, for example, dimethyl distearylammonium chloride; colloidal magnesium aluminum silicates; other montmorillonite clays; and hydrophobically treated montmorillonite clays. All patents mentioned in the present specification are incorporated herein by reference.

The preferred suspending agents are the hydrophobically treated montmorillonite or hectorite clays available under the trademark "Bentone", which are prepared by reacting a clay, such as bentonite or hectorite, in a cation exchange system with a variety of amines. Different amines are reacted to obtain different Bentone suspending agents, which may also differ in the proportions of SiO 2, MgO and Al 2 O 3, all of which have a particle size below about 5 microns and are commercially available from NL Industries, Inc.

The suspending agents are used in amounts of about 0.1 to 10% by weight and preferably 0.5 to 2% by weight of the total composition.

The transparency of the bicarbonate rod decreases as the solubility of the bicarbonate in the soap gel decreases, since some of the bicarbonate is now in suspension, resulting in an opaque rod. These opaque rods, which contain up to 70% by weight and preferably up to 50% by weight of bicarbonate, are very effective rod-shaped deodorants and feel like a cream when applied to the skin, without affecting the hardness properties of the rod. Upon partial replacement of the bicarbonate with talc, a further improvement in the aftertaste of such rods is obtained.

In addition, it has been found that an exchange of a portion of the bicarbonate content for water-absorbing insoluble filler materials in finely divided particulate form such as talc, corn starch and the like, but which exchange does not exceed the amount of bicarbonate, can also be used in the soap-based gel bar. give an even feeling and / or water-absorbing properties to the product. Such materials work to absorb sweat under the armpit, which ensures a dry feeling without changing the normal sweating process.

It has been found that sodium or potassium bicarbonate buffers and lowers the pH of the soap-based rod-shaped deodorant from about 10 to about 8.5 to 9 and from 10.5 to 9.5, respectively, thereby reducing any skin sensitivity. without adversely affecting the required hardness properties of the bar.

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 polyhydric and monohydric alcohol which has been solidified or gelled by means of an alkali metal salt of a saturated fatty acid containing about 14 - 20 carbon atoms. Suitable polyhydric alcohols include glycerin and the lower molecular weight lower alkylene glycols which are liquid at room temperature, such as ethylene glycol, diethylene glycol, butylene glycol and preferably propylene glycol. The alcohol content which includes the polyhydric alcohol and the monohydric alcohol (if included) constitutes the main liquid component of the present composition, from about 20% to 90% by weight of the whole composition.

The monohydric alcohol, which is a lower alkanol, such as ethanol or isopropyl alcohol, can be used instead of only a portion of the polyhydric alcohol so that it does not exceed 2.5 times the amount of the polyhydric alcohol and preferably does not exceed the amount of polyhydric alcohol. . These bars that contain combined alcohols are also effective as deodorant bars. However, the transparency of the alcoholic rod is significantly reduced, i.e. said rods are opaque, not transparent or translucent. The use of ethanol as the sole alcohol base has proved inappropriate due to its drying properties, ie. syneresis.

The polyhydric alcohol or combination of ethanol and the polyhydric alcohol, especially propylene glycol, is converted into a gel with a solidifying ingredient in a known manner to form the solid cosmetic product. In particular, it is preferred to use a stearic acid soap as a gelling agent, which is preferably formed in situ by mixing aqueous alkali, such as sodium or potassium hydroxide, with a hot solution of stearic acid in propylene glycol or mixing it with ethanol. The resulting mixture solidifies into a gel on cooling. Any type of high molecular weight saturated fatty acid can be used, although it is preferred to utilize the commercial stearic acid which comprises substantially a mixture of stearic and palmitic acids. The solidifying agent is used in minor amounts of about 2 to 15% by weight and preferably about 4 to 8% by weight. Although a sodium, potassium or sodium-potassium stearate is intended as a gelling agent, the sodium stearate is preferred.

In addition to the essential components of the present composition, minor amounts of such components, such as perfumes, colorants, may also be incorporated therein. , ultraviolet light absorbers which increase the color, and the like to improve the aesthetic value and acceptability of con- Other optional constituents in minor amounts can be incorporated into the present composition without adversely affecting the side of the sum. its beneficial properties, such as potassium, aluminum and emollients and emulsifiers, such as silicic fatty alcohols, ethoxylated amine soaps; compounds, fatty esters, fatty amides, fatty alcohols and acids. These emulsifiers help so that, when they are part of a melting rod, upon contact with the skin a layer of the composition is deposited on the skin. Preferred emulsifiers include alkoxylated cetyl alcohol, such as polypropylene glycol of the condensate of cetyl alcohol with 20 moles of ethylene oxide, oleyl alcohol, ethoxylated lanolin, especially Solulan, which is a polyethylene glycol ether of lanolin alcohols (average 16 moles of ethylene).

Another optional ingredient which has beneficial effects on the present deodorant rods is thickeners or viscosity enhancing agents which alone or in combination with suspending agents delay the solidification of the materials before the gel solidifies. Particularly useful thickeners include cellulose derivatives such as hydroxyethylcellulose, hydroxypropylcellulose, sodium carboxymethylcellulose (CMC) and Methocel which is a hydroxypropylmethylcellulose containing about 23-32% hydroxypropyl groups, about 16.5-20% methyl groups and about 5% NaCl and having a 4000 - 6000 centipoises.

Known bacteriostats can also be added, although the bicarbonate-containing rod itself is effective as a deodorant without the use of additional bacteriostats.

The process of making the aqueous bicarbonate-containing deodorant rod of the present invention generally comprises mixing an aqueous dispersion (3, 8 persion or solution of the bicarbonate plus the suspending agent (when used) with a hot or heated solution of polyvalent alcohol, stearic acid and alkali metal hydroxide, preferably at about 70 DEG C., accompanied by the addition of perfume, colorants and other optional ingredients (if they are to be included), to form a homogeneous liquid product, after which the hot liquid is poured into molds and cools to room temperature.

During the cooling period, gel formation takes place and the resulting product assumes a solid form, which can be applied to the skin by light rubbing, whereby a thin film of this composition is deposited on the desired areas of the skin. The resulting solid bar is transparent or opaque depending on the amount of bicarbonate added and the particular ingredients used. This rod is stable, ie. there is no separation of specific constituents, and it has good storage properties, ie. no syneresis or shrinkage occurs.

Another method of making the aqueous bicarbonate-containing rods of the present invention involves adding the powdered bicarbonate and filler such as talc (if desired) directly to the hot liquid soap base with stirring, after which the hot pourable mixture is poured. in containers to harden into deodorant rods.

A preferred way of making said bicarbonate-containing rod is to combine the stearic acid with sodium carbonate or potassium carbonate to form the sodium or potassium soap and the sodium or potassium bicarbonate in situ. This reaction is shown by the following equation, wherein R represents the stearyl radical: OOHH RC-OH + Na CO 3 - ~ 9 RC ~ ONa + NaHCO 3 The method of preparing the anhydrous soap-based rods comprises dissolving the alkali metal soap, such as the stearate, in hot polyhydric alcohol. containing a suspending agent, each after which the bicarbonate is added with stirring followed by the addition of the water-absorbent materials, perfume, colorant, etc., and finally the resulting mixture is poured into containers to cool and solidify.

The following specific examples further illustrate the present invention, but it is to be understood that the invention is not limited to these examples. All quantities of the various constituents indicate weight unless otherwise stated.

EXAMPLES 1 - 5 (Sodium soap - propylene glycol - aqueous) Example _ 1 2 3 Part 1 Propylene glycol 53.45 53.35 52.45 Stearic acid 6.00 6.00 6.00 19.1% Na 2 O, caustic soda 3.60 3, 60 3.60 Part 2 Deionized water 35.6 35.6 35.6 Sodium bicarbonate - 0.1 1.0 Sodium bicarbonate _ _ _ (micropulverised) Bentone LT - - - Part 3 Perfume 1.0 1.0 1.0 Triciosan Uvinul 400 (ultraviolet light absorber) 0.05 0.05 0.05 N: - 50.45 6.00 3.60 35.6 3.0 1.0 0.10 0.05 | U1 45.45 6 .00 3.60 7810837-0 Example (continued) Part 4 FDC Blue No. 1.0% solution 0.20 0.20 0.20 0.20 0.20 l00.00 100.00 100.00 10000 .00 100.00 Visual appearance genome-trans-trans- genome-opaque lysane-parent parent luminous de-opaque-containing solution) 1. 4.2 ', 4'-trichloro-2-hydroxydiphenyl ether 2. 2,4-dihydroxybenzophenone Stearic acid and the propylene glycol is mixed and heated to 71, 10 ° C, after which the caustic soda is added.

The bentone component is gradually added to the water with rapid and / or high shear mixing, after which the sodium bicarbonate is added.

The two solutions are mixed together and cooled to 51.1 - 54.4 ° C.

The perfume, bacteriostate and uvinol are mixed together and added to the above mixture, after which the colorant is added.

The total mixture is poured into molds and cooled to solidify into stable deodorant rods.

These examples clearly show the buffering effect of the sodium bicarbonate as well as the improved transparency of the rod at concentrations of 0.1 to 3% by weight of bicarbonate content. The pH measurements are made by dissolving 10 g of the rod-shaped deodorant in 90 g of deionized water by heating and then cooling to room temperature before the readings are made.

EXAMPLES 6 and 7 7810837-0 (Sodium soap - propylene glycol - ethanol -water-based) Example Part 1 Propylene glycol Ethanol (95%) Stearic acid (B quality) 19.1% Na 2 O, caustic soda Part 2 Deionized water Sodium bicarbonate Part 3 Perfume Triclosan (bacteriostate) Uvinul 400 Butyl stearate Part »4 FDC Blue No. 1. 0.1% aqueous solution Visual appearance pH of 32.80 35.75 6.00 3.60 20.00 1.00 0.10 0.05 0.50 0.20 100 .00 l 32.80 32.75 6.00 3.60 20.00 3.00 1.00 0.10 0.05 0.50 The same procedure as in Examples 1-5 is followed.

These examples also show the buffering effect of the bicarbonate in the presence of a mixture of ethanol and propylene glycol. : lill 7010037-0 W EXAMPLES 8 and 9 (fCombination of stearic acid and sodium carbonate) Example § 2 Part 1 'É Propylene glycol V 53.45 52.00; Stearic acid (B quality) 6.00 6.00 _ Trichlorocarbanilide (TCC) V 0.15 - Part 2 Deionized water ~ V 36.6 33.75 _ Sodium carbonate u _ '2.4 V 2.40 å Sodium bicarbonate - _ 3 , 00 'Bentone LT - 0.50 É Methocel (thickener) l - 0.40 å Part 3: Perfume 1.00 § 1.00 uvinul 400 0.05 0.05 É Triclosan (bacteriostate) 0.05 - É flour 4 É F00 Blue No.1 0.1% aqueous solution 0.30 0.30 É 100.00 100.00 ï Visual appearance transparent opaque pH (10% aqueous solution) 9.0 8.80 l. Hydroxypropyl methylcellulose Part 1 is prepared by heating and dissolving the TCC component and the stearic acid in propylene glycol at 71,10C.

Part 2 is prepared by dissolving the sodium carbonate and / or sodium bicarbonate in water while mixing and heating Example Propylene glycol Stearic acid TCC Deionized water Caustic soda (19.1%) NaCl Sodium bicarbonate Diisopropyl adipate Benzyl alcohol Lavender FDC Blue Nr.l {O, l% 400 DP 300 53.45 6.00 0.15 33.4 3.6 0.1 1.0 53.45 6.00 0.15 33.4 3.6 0.1 1.0 1.0 1, Example 12 is significantly more transparent than Examples 10 and 11 and retains its transparency after 20 minutes at 17.8 ° C in a freezer box, while the other bars become slightly misty after freezing. , which thereby shows the superior stability of the bicarbonate-containing rod. In addition, the rod of Example 12 retains its transparency after standing overnight, while the other rods become less transparent.

EXAMPLES 13 and 14 Cream rods Example lay lg Base 5 Q Part l Propylene glycol V 55.0 "75.73 Stearic acid (of double pressed quality) 6.0 - Stearic acid (of triple pressed quality) - 5.00 j Bentone LT 2.0 1 .00 5 Tallow fatty acid - 'V 1,00 J in Part 2 Å water 26,48 10,0! Calcined soda (sodium carbonate) 2,40 s 2,37 Part 3 j Perfume 1,0 1,0 in Glycerol monostearate - 0, Procetyl AWS (emulsifier) l 7.0 3.0 t D & C Green 8 (2.75%) 0.08 - 0 if FDC Green 3 (0.1%) 0.04 - g D & c Red 19 (o, 1%) i -, 0,4 "" »: -,: .-« «.-.- <» - »._ ~.«.. fi _ '15 7810837-o Example (f0rtS-) BGS läflä 50% cream bar base ä. 50% burnt soda (micropulverized) 100% Hïlï 50% cream bar base'C 25% burnt soda (micropulverized) 25% Italian talc .___-_- 100% l. Polypropylene glycol (5 moles) of condensate of cetyl alcohol with 20 moles of ethylene oxide.

The ingredients of Part 1 are mixed and heated to 71 L, 10C and added to the aqueous solution of Part 2 at a temperature of 71.10C. The mixture is cooled to 60 ° C and a mixture of the ingredients of Part 3 is added thereto while mixing to form the creamy rod base.

The micro-powdered burnt soda alone or in combination with the talcum powder is mixed with the hot liquid cream base at a temperature of at least 51,700. The hot pourable mixture is poured into containers and cooled to form a solid rod.

These high-strength bar-shaped deodorants are applied to the skin as a cream. The talc and burnt soda containing the bars give a particularly smooth feeling when rubbed on the skin. 7810837-0 16 EXAMPLES 15 AND 16 (Use of Potassium Bicarbonate) Example Lä »Part I Propylene Glycol 52.3 44.3 Sodium Stearate _ 8.0 8.0 á ~ § Procetyl Aws 3, 0 3, o Part 2 Deionized Water 35 .0 35.0 Potassium bicarbonate 0 8.0 Part 3 Sodium chloride 0.2 0.2 Perfume 1.5 1.5 100.0 in 1oø, o Appearance Transparent Transparent 'to trans- to trans- parent parent pH (10% - aqueous solution) 10.5 9.5 Sodium stearate and procetyl AWS are dissolved in hot propylene glycol at a temperature of about 82.2 ° C. Potassium bicarbonate is dissolved in hot deionized water. Part 2 is added to Part 1 while mixing and the ingredients of Part 3 are mixed.

The results show the buffering effect of potassium bicarbonate and its usefulness at 8% in solution. 731Û837 “0 'Example 17 Example 11 (Anhydrous bar) Propylene glycol ~ 75.8 Sodium stearate Procetyl AWS 4 Sodium bicarbonate (micropulverized) 10 Bentone LT V 0.5 Perfume 1.5 FDC Green No.3 (0.1% in ethanol) 0 .2 100.0 Appearance -Greenish opaque (with good aesthetic properties) Bentone LT is dispersed in propylene glycol and the solution of procetyl AWS under rapid mixing. Sodium stearate dissolves in the mixture at about 85 ° C. The temperature is lowered to 71l and 10C and the sodium bicarbonate powder is mixed together followed by perfume and dye. The product is poured into containers and cooled to form a solid rod.

EXAMPLE 18 Example was (Exchange of propylene glycol for glycerin) Part 1 Glycerin 50.00 Stearic acid (of double-pressed quality) 6.00 Part 2 Deionized water 35.83 Calcined soda (sodium bicarbonate) 2.40 7s1o8s7 ~ o 18 Example (continued) Part 3 Perfume A 1.50 Triclosan (bacteriostate) 0.15 Procetyl AWS 4.00 D&C Green No.8 (2.75%) 0.08 FDC Green No.3 (0.1%) 0.04 l00, Appearance Transparent Part 1 is prepared by dissolving the stearic acid in the glycerin at 71.1 ° C.

Part 2 is prepared by dissolving the calcined soda in deionized water at 71.10 ° C.

Part 1 is gradually added to Part 2 with mixing and cooled to e2, s ° c.

The ingredients of Part 3 are mixed together and the solution is poured into containers and cooled to form a solid bar.

Other polyhydric alcohols may be used in place of propylene glycol partially or completely in the above examples, such as ethylene glycol, butylene glycol, etc. Similarly, the ethanol may be replaced by other monohydric alcohols, such as isopropyl alcohol.

Likewise, other fatty acid soaps can be used instead of the stearate soap.

All rods containing bicarbonate have been shown to be highly effective deodorants - without the use of bacteriostats - which are stable and do not sting and do not shrink.

Although the present invention has been described and illustrated with reference to specific examples, it is to be understood that modifications and variations of composition and procedures are intended to fall within the scope of the appended claims.

Claims (9)

7810837-0 19 P a t e n t k r a v Stable cosmetic deodorant bar, characterized in that it comprises at least 0.1 to 3% and up to 70% by weight of alkali metal bicarbonate as the main deodorant and 0 to 10% by weight of suspending agent, dispersed or dissolved in a polyhydric alcohol , selected from the group consisting of glycerin and lower molecular weight lower alkylene glycols, which are liquid at room temperature, or a mixture of a polyhydric alcohol and a lower alkanol, solidified by 2 to 15% by weight of an alkali metal salt of a monounsaturated C14 - C20 fatty acid gelling agent, which alcohol content constitutes 20-90% by weight of the total composition. A deodorant rod according to claim 1, characterized in that the content of lower alkanol does not exceed the content of polyhydric alcohol. Deodorant bar according to Claims 1 or 2, characterized in that the polyhydric alcohol is propylene glycol and the monohydric alcohol is ethanol. Deodorant rod according to one of the preceding claims, characterized in that the gelling agent is sodium stearate and constitutes about 2 - 15% by weight. Deodorant bar according to one of the preceding claims, characterized in that the polyhydric alcohol constitutes 20-90% by weight of propylene glycol and that the gelling agent constitutes about 2-15% by weight. Deodorant rod according to any one of the preceding claims, characterized in that it contains an alkali metal bicarbonate powder having a particle size of about 5 - 100 microns, and about 0.1 - 10% by weight of a suspending agents selected from a group consisting of colloidal silica, colloidal alumina, colloidal magnesium alumina silicates and finely divided hydrophobic clays. A deodorant rod according to claim 6, characterized in that said clay is selected from a group consisting of the hydrophobically treated reaction products of bentonite or hectorite. Deodorant rod according to any one of the preceding claims, characterized in that it contains a finely divided particulate water-absorbent filler material in combination with said bicarbonate powder in a substantially anhydrous soap gel. Deodorant rod according to any one of the preceding claims, characterized in that the alkali metal bicarbonate is formed in situ simultaneously with the alkali metal stearate option by reaction between stearic acid and alkali metal carbonate.