Acidic Stick Deodorants

Abstract

Products and methods are disclosed relating to a deodorant stick comprising mandelic acid.

Claims

1. An acidic stick deodorant comprising a personal care composition comprising a solid or semi-solid waxy phase comprising one or more waxes, a starch, and mandelic acid associated with a thickener substantially uniformly dispersed in the waxy phase.

2. The acidic stick of claim 1, wherein the thickener is selected from one of a starch, a swellable mineral, and a gum.

3. The acidic stick of claim 1, having a viscosity at 25° C. of at least 100,000 cps, an effective pH between 2 and 5.5.

4. A method for preparing an acidic stick deodorant comprising:1) preparing a thickened aqueous phase comprising at least 3% mandelic acid and a thickener in an aqueous solution; 2) melting one or more waxes and at least one of an oil, a fatty acid, a fatty ester, a fatty alcohol, a soap, and a butter to form a molten waxy phase, 3) combining the thickened aqueous phase with the waxy phase, 4) combining a powder with the combination of the aqueous phase with the waxy phase.

5. The method of claim 4, having an effective pH between 2 and 6.

6. The method of claim 4, having an effective pH between 3 and 5.5.

7. The method of claim 4, further comprising combining caffeine with at least one of the aqueous phase and the oil phase.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 depicts a stick of deodorant in a dispenser according to certain embodiments of the present invention.

DETAILED DESCRIPTION

[0028] FIG. 1 depicts a stick dispenser 40 comprising a stick of a deodorant composition 42 contained within the walls of a container 44 having a turnable knob 46 attached to a threaded spindle 48 that drives the motion of an associated platform 49 on which the stick of a deodorant composition 42 rests. Thus, by turning the knob 46, the amount of the stick of a deodorant composition 42 rising above the walls of a container 44 can be adjusted. A cap for the container 44 is not shown. Such dispensers may be filled by pouring a slurry or melt into the dispenser and allowing the slurry to harden, or may be formed by packing solid or semi-solid material into the dispenser and then compressing it and/or heating it to form a suitable deodorant stick.

[0029] Further Details

[0030] Stick deodorants and related cosmetic stick products are known in a variety of forms, all of which may be suitably adapted for the various embodiments described herein. For example, cosmetic sticks having antiperspirant and/or deodorizing effects and based on alcoholic soap gels and/or propylene glycol soap gels are well known (e.g., see U.S. Pat. Nos. 2,900,306, “Cosmetic and Deodorant Sticks,” issued to Slater, Aug. 1959; 2,857,315, “Propylene Glycol Soap Gel Stick Anti-Perspirant,” issued Oct. 1958 to Teller; and U.S. Pat. No. 2,933,433, “Stable Anti-Perspirant Stick,” issued April 1960 to Teller et al.). A translucent stick product is described in U.S. Pat. No. 5,650,143, “Deodorant Cosmetic Stick Composition,” issued Jul. 22, 1997 to Bergmann.

Examples

[0031] The ingredients mentioned in the Examples below were drawn from the following, unless otherwise specified: [0032] almond oil:: Formulator Sample Shop, Iron Station, NC [0033] arrowroot starch: Bob's Red Mill, Milwaukie, Oregon [0034] beeswax: Sky Organics, Delray Beach, FL [0035] cacao butter: Cacao Butter Wafers, Terrasoul Foods, Fort Worth, Tex. [0036] caffeine: 200 mg capsules, Bulk Suplements, Henderson, NV [0037] candelilla wax: TKB Trading, Oakland, Calif. [0038] caprylic capric triglycerides MCT: Formulator Sample Shop, Iron Station, NC [0039] cetyl alcohol: Formulator Sample Shop, Iron Station, NC [0040] coconut oil: LouAna Coconut Oil, Ventura Foods, Brea, Calif. [0041] emulsifying wax: Milliard® Emulsifying Wax, Milliard Brands, Lakewood, N.J. [0042] laponite powder: Laponite XL21, BYK USA, Inc., Gonzales, TX [0043] lauryl laurate: TKB Trading, Oakland, Calif. [0044] Lip Stick Base: TKB Trading, Oakland, Calif. (a mixture of castor seed oil, cetyl stearyl alcohol, olive fruit oil, beeswax, hydrogenated castor oil, glycine soybean lipids, lauryl laurate, carnauba wax, candelilla wax) [0045] mandelic acid powder: Pure Health Botanicals, St. Charles, Ill. [0046] palmitic acid 98%, Acme-Hardesty, Blue Bell, PA [0047] shea butter (unrefined): TKB Trading, Oakland, Calif. [0048] Softisan: FSS Softisan 378, Formulator Sample Shop, Iron Station, NC (this material is a lanolin-like material made from a blend of triglycerides based on saturated even-numbered, unbranched natural fatty acids of vegetable origin) [0049] stearyl alcohol: Alcohol 1989 N F Pastilles, Acme-Hardesty, Blue Bell, PA [0050] tapioca starch: Erawan Marketing Co., Bangkok, Thailand [0051] TKB gelmaker CC: TKB Trading, Oakland, Calif. (this material is a blend of dicaprylyl carbonate, stearalkonium hectorite and propylene carbonate, and is used to create gels) [0052] water is distilled water unless otherwise specified [0053] xanthan gum: Carrington Farms, Closter, NJ

[0054] Example 1 was prepared without an added thickener from a relatively volatile solvent system. 0.398 g of mandelic acid powder was placed in a beaker with 4.11 g of 40% ethanol in water and 0.62 g of glycerin. The mandelic acid was then stirred to dissolve it completely in the solvent system. To this was added 2.60 g of cacao butter, 2.85 g of beeswax, 1.16 g of coconut oil, 1.25 g of caprylic capric triglycerides MCT, and 1.90 g of stearyl alcohol. This beaker was placed in a bath of hot water at about 80° C. After stirring, the aqueous phase was not mixing well with the oil phase, so 0.86 g of emulsifying wax was added and blended in, resulting in a good emulsion. The combination remained above 60° C. for about 5 minutes. As the combination cooled below 60° C., 3.0 g of tapioca starch was rapidly blended in with a whisk and the mixture was poured into a deodorant mold and allowed to cool. The resulting solidified material was a somewhat waxy solid with a smooth and pleasant texture having no hint of graininess. Rubbing a slight amount onto the fingers and then adding a drop of water, and touching that water to a pH strip indicated a pH around 3.

[0055] Example 2. An acid-starch paste was made by combining 17.5 g of mandelic acid with 50 ml of water and heating to dissolve. After heating and stirring, about 5 g of water were lost. This was Acid Solution 1.3.11 g of tapioca starch were then combined with 3.1 ml of water to form a uniform slurry at about 22° C. Then 25.0 g of Acid Solution 1 was blended into the starch in a beaker, a stirring rod was added and the mixture was placed on a magnetic stirrer hot plate and gradually heated and stirred. As the mixture rose above about 50° C., it began to form a thickened paste. This paste is Acid Paste 1.

[0056] Then 0.38 g palmitic acid was combined with 5.00 g lipstick base, 1.03 g lauryl laurate, 3.00 g coconut oil, 4.60 g stearyl alcohol, 2.43 g cacao butter, and 200 mg caffeine. This was melted in a double boiler. Then 1.26 g of Acid Paste 1 was blended in with a whisk, and as the mixture cooled to about 53° C., 4.5 g of arrowroot starch was blended in. The mixture was then spooned into a 15 ml oval deodorant stick/lip balm mold and allowed to solidify. The starch concentration seemed somewhat too high for this mixture, with some evidence that portions of the acidic paste were not fully dispersed by hand stirring with a whisk.

[0057] Example 3. An acidic paste was made from 1.351 g laponite powder and 0.226 g xanthan gum with 25.7 g of Acid Solution 1. This was also stirred and heated on a magnetic stirrer plate until it reach a temperature of 45° C. This was Acid Paste 2, 1.00 g of which was stirred into an oil phase formed by heating the following on a double boiler to about 75° C.: 200 mg of caffeine combined with 0.60 g shea butter, 7.00 g lipstick base, 4.50 g stearyl alcohol, 1.13 g beeswax, 1.48 g cacao butter, 0.51 g candelilla wax, and 1.03 g of almond oil. After Acid Paste 2 was blended with the oil phase using a whisk, 3.00 g of arrowroot starch were blended in and the mixture was spooned into a 15 ml deodorant/lip balm container and cooled. The white, opaque solid had a very firm texture and may have had slightly too much starch for easy dispensing onto the skin, or the laponite and gum combination may have increased the viscosity of the stick relative to some other mixtures with starch. When a small quantity was blended with water and placed on Hydrion® 3.0 to 6.0 pH paper, a pH of about 4.0 was indicated.

[0058] Example 4. Acid Paste 3 was prepared by diluting Acid Paste 1 with about 15% added water to reduce viscosity and improve blending. An oil phase was prepared using 1.50 g Softisan, 2.50 g caprylic capric triglycerides MCT, 2.10 g stearyl alcohol, 2.65 g lipstick base, 5.00 g coconut oil, 0.79 g emulsifying wax, and 200 mg caffeine. The oil phase, heated in a double boiler at about 75° C., was blended with 0.92 g of Acid Paste 3 and then after about several minutes of stirring and gradual cooling, 2.13 g of arrowroot starch was blended in at about 55° C. A smooth, slick, pleasant-feeling solid was obtained after cooling that readily dispenses against the skin, with no hint of graininess. The effective pH was estimated at about 4.4 to 4.8. One problem, though, is that some clear zones apparently from Acid Paste 3 remained at the bottom of the small container used to mix the composition, suggesting that mixing was inadequate and perhaps emulsifying wax would have helped. The pH may have been lower had all the starch blended in more completely.

[0059] Example 4. An oil phase was prepared using 7.00 g caprylic capric triglycerides MCT, 3.5 g stearyl alcohol, 2.00 g cacao butter, 2.21 g coconut oil, 2.5 g emulsifying wax, 1.00 g shea butter, and 200 mg caffeine. This was combined at 74° C. and then 2.12 g of Acid Paste 3 was blended in. Following slight cooling, 3.85 g of arrowroot starch was blended in. The resulting solid had a firm, smooth texture that could dispense well against the skin. Each of 3 different pH papers (0 to 14, 0 to 6, and 3.0 to 5.5) suggested the effective pH after being rubbed with water was near 3.0.

[0060] Example 5. An oil phase was prepared by combining 4.00 g of caprylic capric triglycerides MCT, 5.00 g cetyl alcohol, 3.50 g shea butter, 0.50 g cacao butter, 1.05 g coconut oil, and 200 mg caffeine. It was mixed at 74° C. 2.00 g of Acid Paste 3 was blended in and then, after slight cooling, 2.70 g of arrowroot starch was added. This run showed some slight separation in the bottom of the container, suggesting emulsifying wax or more intense mixing may have been helpful.

[0061] Example 6. Acid Paste 4 was made by combining 13 g mandelic acid in 100 ml of water with 8.35 g arrowroot starch and cooking in a frying pan to create a translucent paste. Then 9.0 g almond oil was combined with 4.26 g stearyl alcohol, 2.68 g cacao butter, 0.200 g caffeine and 1.57 g emulsifying wax. After melting, 2.15 g of Acid Paste 4 was blended in, and then, after slight cooling, 3.68 g of arrowroot starch was blended in. A portion of the hot composition was poured into a 15 ml deodorant/lip balm container. The cooled result had a smooth tactile feel but was also on the firm side.

[0062] Example 7.7.36 g of the remaining composition from Example 6 was combined with 0.84 g cacao butter, 0.79 g beeswax, 0.34 g shea butter, and 1.37 g arrowroot starch. The resulting mix had a pH of about 5.5. This was melted again and 1.25 g of Acid Paste 4 was blended in to lower the pH.

[0063] Example 8. An oil phase was made from 8.9 g caprylic capric triglycerides MCT, 0.91 g cacao butter, 1.00 g shea butter, 2.47 g beeswax, 5.25 g stearyl alcohol, 3.00g emulsifying wax, 200 mg caffeine, and 1.10 g almond oil. After melting, 4.0 g of Acid Paste 4 was blended in, and then 6.2 g of arrowroot starch was added. The result was too starchy and lacked the strength expected in a waxy composition. A portion of the result, 13.4 g, was melted and combined with 2.1 g stearyl alcohol, 1.15 g almond oil, and 1.35 g candelilla wax. The pH was tested and was on the high side, so the mix was remelted and 4.9 g of Acid Paste 4 was blended in. The result had a more acceptable feel and gave an effective pH when wetted of about 3-3.5.

[0064] A wide variety of other examples were also carried out. Initialy demonstration of the mandelic acid stick concept was made by blending combinations of corn starch and mandelic acid to form a viscous paste with mandelic acid concentrations from 6% to 15%, using starch concentrations from about 4% to 7%. This was then blended with various oil phases, including combinations with emulsifying wax, beeswax, and other waxes, with added TKB gelmaker CC in some cases. Then, rather than stirring in starch or other solids, the mix of the oil phase and acid paste was blended in with roughly an equal part of molten commercial deodorant or antiperspirant. Some of the best results in this early phase were obtained with aluminum-free deodorants with a waxy base in which caprylic capric triglycerides were the lead ingredient, such as Women Mitchum®'s Natural Power Bamboo Powder deodorant, comprising caprylic capric triglycerides, corn starch, coconut oil, stearyl alcohol, tapioca starch, arrowroot starch, sodium bicarbonate, and other ingredients. When the acid paste was combined with the alkaline Mitchum® deodorant, the bicarbonate reacted with the mandelic acid releasing small bubbles of carbon dioxide that caused the molten mixture to foam up, changing its texture and appearance significantly, but after cooling, good results were obtained with a firm texture and, due to excess acid, a pH in the range of 3 to 4. More challenging were attempts using Native® natural deodorant and other products with larger amounts of sodium bicarbonate or in which alkaline magnesium hydroxide was the lead ingredient. Acidic mixes could be made with the starch-acid method, but the final results in some cases were not satisfying in their texture. Better results were obtained by making the composition from scratch, rather than seeking to turn non-acidic compositions into an acidic mixture.

[0065] Among the efforts to combine an acidified waxy phase with an existing deodorant stick, a silicone-based antiperspirant was used, Degree® brand from Unilever, with cyclopentasiloxane as the primary ingredient. This was melted down and combined with 1.48 g of Acid Paste 4, giving an acidic mix. However, the volatile nature of the cyclopentasiloxane resulted in mass loss from the material. But the final result, after resolidification, did not show obvious signs of failure.

REMARKS

[0066] When introducing elements of aspects of the invention or the embodiments thereof, the articles “a,” “an,” “the,” and “said” are intended to mean that there are one or more of the elements, and thus may include plural referents unless the context clearly dictates otherwise. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements.

[0067] Having described aspects of the invention in detail, it will be apparent that modifications and variations are possible without departing from the scope of aspects of the invention as defined in the appended claims. As various changes could be made in the above compositions, products, and methods without departing from the scope of aspects 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.

[0068] While the foregoing description makes reference to particular illustrative embodiments, these examples should not be construed as limitations. The inventive system, methods, and products can be adapted for other uses or provided in other forms not explicitly listed above, and can be modified in numerous ways within the spirit of the present disclosure. Thus, the present invention is not limited to the disclosed embodiments, but is to be accorded the widest scope consistent with the claims below.