ANHYDROUS SOLID COMPOSITION COMPRISING A MAGNESIUM SALT AND STARCH

Abstract

The present invention relates to an anhydrous solid cosmetic composition, particularly for treating body odors resulting from perspiration, comprising, in a cosmetically acceptable medium, from 5% to 25% by weight with respect to the total weight of the composition of at least one magnesium salt and from 15% to 40% by weight with respect to the total weight of the composition of starch.

Figure for the abstract: none

Claims

1. An anhydrous solid cosmetic composition comprising, in a cosmetically acceptable medium, from 5% to 25% by weight with respect to the total weight of the composition of at least one magnesium salt and from 15% to 40% by weight with respect to the total weight of the composition of starch.

2. The composition according to claim 1, wherein the magnesium salt is chosen from magnesium oxide, magnesium carbonate, magnesium hydroxide, magnesium bicarbonate and mixtures thereof

3. The composition according to claim 1, wherein the magnesium salt is magnesium oxide.

4. The composition according to claim 1, wherein the magnesium salt is present in a content ranging from 7 to 20% by weight, with respect to the total weight of the composition.

5. The composition according to claim 1, wherein the weight ratio between the magnesium salt(s) and the starch is less than or equal to 1.

6. The composition according to claim 1, comprises at least one fatty alcohol.

7. The composition according to claim 1, which comprises at least one wax chosen from hydrocarbon waxes; hydrogenated sunflower oil, hydrogenated castor oil, hydrogenated coconut oil, hydrogenated lanolin oil, and di-(trimethylo1-1,1,1 propane) tetrastearate.

8. The composition according to claim 1, which comprises at least one pasty compound chosen from isomerized jojoba oil, orange wax, cupuacu butter, shea butter, partially hydrogenated olive oil, cocoa butter, mango butter, shorea butter, murumuru butter, and mixtures thereof.

9. The composition according to claim 1, which comprises at least one oil.

10. The composition according to claim 1, which comprises less than 5% by weight of aluminum salt(s).

11. The composition according to claim 1, which is substantially free from silicone oil.

12. A product comprising a composition according to claim 1, packaged in a container made of plastic, cardboard, or paper.

13. A cosmetic method for treating body odors resulting from perspiration, comprising the application of a composition according to claim 1 on the skin.

14. The composition according to claim 2, wherein the magnesium salt is present in a content ranging from 7 to 20% by weight with respect to the total weight of the composition.

15. The composition according to claim 3, wherein the magnesium salt is present in a content ranging from 7 to 20% by weight with respect to the total weight of the composition.

16. The composition according to claim 2, wherein the weight ratio between the magnesium salt(s) and the starch is less than or equal to 1.

17. The composition according to claim 2, wherein the weight ratio between the magnesium salt(s) and the starch is less than or equal to 1.

18. The composition according to claim 3, wherein the weight ratio between the magnesium salt(s) and the starch is less than or equal to 1.

19. The composition according to claim 2, which comprises at least one fatty alcohol.

20. The composition according to claim 3, which comprises at least one fatty alcohol.

Description

EXAMPLE 1

Anhydrous Solid Composition According to the Invention and Deodorant Performance Evaluation

[0102] 1/ Anhydrous solid composition a according to the invention was prepared according to the following protocol:

[0103] Place the oily phase (phase A) in a beaker and place it in a water-bath at a set-point temperature of 100 C. until the fats have completely melted;

[0104] Set the set-point temperature of the melter to 90 C. After introducing phase A into the melter, set the rotor-stator to 400-500 rpm and mix;

[0105] Gradually add magnesium oxide (phase B) under stirring at 600 rpm for about 5 min, and allow to homogenize for 10 min;

[0106] Gradually add corn starch (phase C) under stirring at 800 rpm for about 5 min, and allow to homogenize for 5 min;

[0107] Stop stirring with the rotor-stator and place the mixture under stirring with a bar magnet; pour the sticks at a set-point temperature of 68-70 C.;

[0108] Place the sticks at 4 C. for 45 min until fully solidified.

TABLE-US-00001 TABLE 1 A Ingredient % (w/w) Phase CORN STARCH 22 C MAGNESIUM OXIDE 10 B CETYLSTEARYL ALCOHOL 15 A Caprylic/capric triglycerides Qs 100 A REFINED RAPESEED OIL A HYDROGENATED CASTOR OIL 4 A SHEA BUTTER 4 A

[0109] 2/ Formula A is compared to comparative compositions C1 (containing aluminum salts) and C2 below.

TABLE-US-00002 TABLE 2 C1 C2 (comparative) (comparative) Ingredient % (w/w) % (w/w) MAGNESIUM OXIDE 7 CETYLSTEARYL ALCOHOL 25 25 C12-C15 alkyl benzoate Qs 100 Qs 100 Isopropyl myristate 26.7 26.7 HYDROGENATED CASTOR OIL 4 8 Perlite 0.2 Aluminum salts 15 (ALUMINUM ZIRCONIUM TETRACHLOROHYDREX GLY)

[0110] An efficacy test is conducted by a panel of 5 experts:

[0111] The deodorant efficacy of each formula at 24 h and 48 h is evaluated after a single standardized application on the treated armpit compared to the untreated armpit by sensory evaluation (sniff-test).

[0112] The subjects have an average perspiration odor intensity on the armpits between 5 and 8 with a difference in intensity between the two armpits less than or equal to 1 (on a scale ranging from 0 to 10).

[0113] They perform 5 back-and-forth applications of composition under one armpit (average quantity deposited 0.400.05 g).

[0114] The results show that after a standardized application on the treated armpit versus the untreated armpit, a significant reduction in perspiration odor intensity is observed at 24 h and at 48 h for formula A.

[0115] The reductions observed are however not significantly different from the reductions observed with formulas C1 and C2.

[0116] In conclusion, the formula according to the invention is as effective as formulas comprising 15% aluminum salts (formula C1).

[0117] The combination of ingredients with a large quantity of starch, as is the case of formula A according to the invention, results in less greasy and drier sensory properties.

[0118] 3/ Formula A according to the invention is also evaluated in terms of stick hardness, quantity deposited and stability (at 24 h at ambient temperature (AT), after 2 months at AT and after 2 months at 4 C.).

[0119] Stick hardness is measured according to the protocol described in the description.

[0120] Stick deposition was evaluated via an application on Wipall wipes (substrate mimicking armpit skin).

[0121] On each wipe, 5 stick passages are applied; 2 wipes are used for each formula to mimic both armpits. The quantity deposited is measured by weighing on a precision balance, before and after the 10 passages (it is estimated that a standard deposition is 0.4 g/armpit in vivo).

[0122] The appearance of the deposition is evaluated visually, in order to detect the presence of any white stains and/or particles.

[0123] The hardness values and quantities deposited are compared with two competitor products (1 and 2), which are commercial sticks based on natural raw materials.

[0124] The results are as follows:

TABLE-US-00003 TABLE 3 Competitor Competitor product 1 product 2 Formulas A (comparison) (comparison) Hardness (N) 9.32 7.69 3.39 Deposition (g) 0.6 0.6 1.0 Stability: at 24 h at AT Compliant after 2 months at AT Compliant after 2 months at 4 C. Compliant

[0125] The deposited quantities are compliant and the quality of the depositions of both sticks according to the invention is better than the competitor products.

[0126] The formulas according to the invention thus offer the best compromise between stick stability, sufficient deposition, and deodorant performance.

EXAMPLE 2

Anhydrous Solid Compositions According to the Invention

[0127] Anhydrous solid compositions F1 to F7 according to the invention were prepared according to the protocol in example 1.

TABLE-US-00004 TABLE 4 F1 F2 F3 Ingredient % (w/w) % (w/w) % (w/w) Phase CORN STARCH 22 22 22 C MAGNESIUM OXIDE 10 10 10 B CETYLSTEARYL ALCOHOL 11.9 10.7 21.2 A REFINED RAPESEED OIL Qs 100 Qs 100 Qs 100 A HYDROGENATED 6.2 8 4.3 A CASTOR OIL SHEA BUTTER 4.6 4.1 3.2 A

TABLE-US-00005 TABLE 5 F4 F5 F6 F7 Ingredient % (w/w) % (w/w) % (w/w) % (w/w) Phase CORN STARCH 22 22 22 22 C MAGNESIUM OXIDE 10 10 10 10 B CETYLSTEARYL 15 15 15 15 A ALCOHOL REFINED Qs Qs Qs Qs A RAPESEED OIL 100 100 100 100 CANDELILLA WAX 4 A SUNFLOWER WAX 4 10 A RICE BRAN WAX 4 A SHEA BUTTER 4.6 4.1 3.2 3.2 A

[0128] Formulas F1 to F3 according to the invention were packaged in plastic packaging, and formulas F1, F4 to F7 were packaged in cardboard packaging.

[0129] F1 to F3 according to the invention packaged in plastic packaging, and F1 packaged in cardboard packaging, were also evaluated in terms of stick hardness and deposited quantity:

TABLE-US-00006 TABLE 6 F1 F1 (packaged (packaged in plastic in cardboard Formulas packaging) packaging) F2 F3 Hardness (N) 14.73 7.85 12.63 24.49 Deposition (g) 0.5 0.5 0.5 0.35

[0130] The formulas according to the invention offer a good compromise between stick stability and sufficient deposition.