METHOD FOR THE COSMETIC TREATMENT OF KERATIN MATERIALS EMPLOYING A RARE EARTH METAL COMPOSITION AND AN ALKALINE COMPOSITION

Abstract

The invention relates to a method for the cosmetic treatment of keratin materials, in particular human keratin materials, such as the skin or hair, comprising a stage of application of a composition comprising a compound of a metal belonging to the group of the rare earth metals, followed by a stage of application of an alkaline composition.

Claims

1. Method for the cosmetic treatment of keratin materials, comprising: a) a first stage of application, to the said keratin materials, of a composition (A) comprising from 0.5% to 15% by weight, with respect to the total weight of the composition (A), of one or more compounds of a metal belonging to the group of the rare earth metals, then b) a second stage of application, to the said keratin materials, of a composition (B) comprising one or more alkaline agents.

2. Method according to claim 1, characterized in that the metal of the metal compound(s) is chosen from cerium, yttrium, ytterbium, lanthanum or europium.

3. Method according to either claim 1, characterized in that the metal belonging to the group of the rare earth metals is in the +III oxidation state.

4. Method according to claim 1, characterized in that the metal compound(s) are chosen from salts of rare earth metals, complexes of rare earth metals or oxides of rare earth metals.

5. Method according to claim 1, characterized in that the metal compound(s) are chosen from compounds combined with a monoatomic or non-monoatomic monoanionic ion, compounds combined with a di- or trianionic ion, compounds combined with a ligand comprising one or more groups forming a coordination bond and a functional group forming an ionic bond, oxides of rare earth metals, and their mixtures; preferably from yttrium dihydroxyacetate, cerium chloride, yttrium chloride, lanthanum chloride, Ce(acetonate).sub.3, cerium oxide, lanthanum oxide, yttrium oxide, erbium oxide, scandium oxide, ytterbium oxide, europium oxide, and their mixtures.

6. Method according to claim 1, characterized in that the composition (A) exhibits an acidic pH, preferably of between 2 and 7, more preferentially still of between 2 and 5.

7. Method according to claim 1, characterized in that the alkaline agent(s) are chosen from organic alkaline agents, inorganic alkaline agents, and their mixtures; preferably from alkanolamines, such as monoethanolamine, ammonia and alkali metal carbonates and bicarbonates, such as sodium, potassium or ammonium carbonate or bicarbonate, and the mixtures of these compounds.

8. Method according to claim 1, characterized in that the content of the alkaline agent(s) ranges from 0.05% to 25% by weight, preferably from 0.5% to 15% by weight, with respect to the total weight of the composition (B).

9. Method according to claim 1, characterized in that the composition (B) exhibits a pH of greater than 7, preferably of between 8 and 10.

10. Method according to claim 1, characterized in that the composition (A) and/or the composition (B) additionally comprises one or more thickening agents, preferably chosen from organophilic clays, fumed silicas and their mixtures.

11. Method according to claim 1, characterized in that stages a) and b) are carried out successively without an intermediate stage of rinsing of the keratin materials.

12. Method according to claim 1, characterized in that stage b) is followed by a stage of final washing and/or rinsing of the said keratin materials.

Description

EXAMPLES

[0116] In the examples which follow, all the amounts are shown, unless otherwise indicated, as percentage by weight of active material, with respect to the total weight of the composition.

Example 1: Method for the Treatment of the Hair

[0117] Compositions

[0118] Compositions A1, A2, A3 and B1 to B4 were prepared from the ingredients, the contents of which are shown as active material in the tables below:

TABLE-US-00001 TABLE 1 Compositions A Ingredients A1 A2 A3 Cerium chloride•7H.sub.2O 5 — — (Sigma-Aldrich) Lanthanum chloride•7H.sub.2O — 5 — (Sigma-Aldrich) Yttrium hydroxyacetate — — 5 Water q.s. q.s. q.s. for 100 for 100 for 100

TABLE-US-00002 TABLE 2 Ingredients B1 20% Aqueous ammonia 25 Water q.s. for 100

[0119] Procedure

[0120] Locks of 2.7 g of bleached hair are styled/shaped beforehand.

[0121] The first three locks L1, L2 and L3 are treated with 0.75 g of composition A1, A2 and A3 per lock.

[0122] After a leave-in time of 15 minutes, the locks L1, L2 and L3 are subsequently treated, without intermediate rinsing, with 0.75 g of composition B1 per lock, followed by a leave-in time of 15 minutes.

[0123] The locks are subsequently washed/rinsed/superficially dried.

[0124] At the same time, three other locks L1′, L2′ and L3′ are treated with 0.75 g of composition B1 per lock.

[0125] After a leave-in time of 15 minutes, the locks L1′, L2′ and L3′ are subsequently treated, without intermediate rinsing, with 0.75 g of composition A1, A2 and A3 per lock, followed by a leave-in time of 15 minutes.

[0126] The locks are subsequently washed/rinsed/superficially dried.

[0127] Evaluation and Results

[0128] After free drying, the locks are evaluated visually. The cartonating effect is evaluated, which effect corresponds to the presence of zones in the lock where the hairs are stuck to one another or the absence of such stiff zones. If the lock does not exhibit cartonating zones, the grade is 0. If the lock is completely covered with cartonating zones, the grade is 5. The evaluations are carried out by steps of 0.5 point.

[0129] The evaluation of the locks L1, L2, L3, L1′, L2′ and L3′ and an untreated lock L0 shows a reduction in the cartonating effect when the protocol according to the invention is followed.

TABLE-US-00003 TABLE 3 Lock LI L1′ L2 L2′ L3 L3′ 0 3 0 2 2 3

Example 2: Method for the Treatment of the Hair

[0130] Demonstration of the Styling Effect and its Persistence

[0131] Procedure

[0132] Malleable heads are prepared by cutting the hair with a mid-length cut (thus arriving at the base of the neck).

[0133] On a first malleable head H1, an application is carried out on the right half head according to the following procedure:

[0134] 1. 1 g of composition A1 is applied with a pipette at the roots and then the hair is combed from the root to the ends in order to cause the composition to penetrate and to spread it. This is repeated nine times in a row, care being taken to treat the majority of the hairs of this part of the malleable head.

[0135] 2. Then, after a leave-on time of 15 minutes, the composition B1 is applied on the same part of the malleable head in a proportion of 2 g of composition B1. This application is repeated 10 times in total. Then, after a leave-on time of 15 minutes, the head of hair is copiously rinsed.

[0136] On the same head H1, the application is carried out on the left half-head according to the same process as before, except that the composition A1 is replaced by the composition A0, a composition comprising only water.

[0137] Evaluation and Results

[0138] A first evaluation is carried out.

[0139] To do this, the starting point is to dry the hair with a hairdryer, without carrying out blow drying (drying is carried out by the simple effect of the air of the hairdryer). Combing is then carried out, while trying to place the hair horizontally. To do this, each lock is taken in the teeth of the comb at the root and then the comb is slid towards the ends while forcing the hair towards the back.

[0140] It is observed that, in the two parts of the malleable head, the hair is indeed positioned (hair at the back) but, as soon as the hair is no longer held by the teeth of the comb, the shape given to the left half-head does not hold. The hair falls virtually immediately. Conversely, the shape given to the right half-head holds well; the hair remains in place towards the back of the head.

[0141] The same malleable head is washed five times. After each washing operation, the hold of the shaping of the hair towards the back of the head is evaluated.

[0142] There is again observed, on the left half-head, a difficulty in retaining the shape of the styled hair towards the back. On the right side of the malleable head, the possibility is observed of positioning the hair at the back in a lasting manner. After five other washing operations, as it is observed on the right side that the hold of the shape of the hairstyle towards the back of the head decreases, the treatment described above is again carried out in order to reactivate the possibility of the hair being styled at the back.

Example 3: Method for the Treatment of the Hair

[0143] Compositions

[0144] Compositions B2, B3 and B4 were prepared from the ingredients, the contents of which are shown as active material in the tables below:

TABLE-US-00004 TABLE 4 Compositions B Ingredients B2 B3 B4 B0 Ammonia (20% in 10% — — water) Sodium — 10% — — bicarbonate 10% Sodium — — 10% — hydroxide in water pH 11.2  8.3 13.2 6.9 Water q.s. q.s. q.s. q.s. for 100 for 100 for 100 for 100

[0145] Procedure

[0146] The same protocol as described for Example 2 is carried out.

[0147] On a malleable head H2, the protocol starting from the composition A1 and then from the composition B2 is applied on the right half-head and the protocol consisting in applying the composition A1 and then the composition B0 is applied on the left half-head.

[0148] On a malleable head H3, the same protocol starting from the composition A1 and then from the composition B3 is applied on the right half-head and the protocol consisting in applying the composition A1 and then the composition B0 is applied on the left half-head.

[0149] Results

[0150] A much greater styling power is observed, on the malleable head H2, on the right than that observed on the left half-head. A styling power is observed, on the malleable head H3, which is greater on the right than that obtained on the left half-head.

Example 4

[0151] Procedure

[0152] The same test is carried out as in Example 2, except that the rare earth metal compound of the first composition is replaced using the compositions A2 or A3.

[0153] The composition A2 and then the composition B1 are applied on the right half-head on a malleable head H4 and then rinsing is carried out. The composition A2 and then the composition B0 are applied on the left half-head and then rinsing is carried out.

[0154] The composition A3 and then the composition B1 are applied on the right half-head on a malleable head H5 and then rinsing is carried out. The composition A3 and then the composition B0 are applied on the left half-head and then rinsing is carried out.

[0155] Results

[0156] An ease of styling is observed on the right on the malleable head H4, making it possible to place the hair at the back.

[0157] An ease of styling is observed on the right on the malleable head H5.

Example 5

[0158] Compositions

[0159] The following comparative composition A4 is produced:

TABLE-US-00005 TABLE 5 Ingredients A4 Calcium chloride 10% dihydrate (Sigma- Aldrich) Water q.s. for 100

[0160] Procedure

[0161] The same test is carried out as in Example 2, except that the composition A1 and then the composition B1 are applied on the right half-head on a malleable head H6 and then rinsing is carried out. The composition A4 and then the composition B1 are applied on the left half-head and then rinsing is carried out.

[0162] Results

[0163] Retention of the shaping carried out at the time of the styling is observed on the right half-head: the hair remains positioned on the back of the head. Styling power is not encountered on the left half-head.