Oxidizing composition for treating keratin fibres, comprising a scleroglucan gum and a phosphorus-based sequestrant

Abstract

The present invention relates to a cosmetic composition for treating keratin fibres, preferably human keratin fibres such as the hair, comprising, in a cosmetically acceptable medium: —one or more chemical oxidizing agents, —one or more scleroglucan gums, —one or more phosphorus-based sequestrants. The present invention also relates to a process for treating keratin fibres, preferably human keratin fibres such as the hair, comprising the application of the composition to the keratin fibres. The process according to the invention is preferably a process for bleaching, dyeing or permanently reshaping keratin fibres.

Claims

1. A cosmetic composition for treating keratin fibres comprising, in a cosmetically acceptable medium: hydrogen peroxide representing from 2% to 20% by weight relative to the total weight of the composition, one or more scleroglucan gums representing from 0.2% to 5% by weight relative to the total weight of the composition, one or more phosphorus sequestrants comprising one or more phosphorus atoms chosen from tetrasodium pyrophosphate, etidronic acid, tetrasodium etidronate and mixtures thereof representing from 0.01% to 0.5% by weight relative to the total weight of the composition, and wherein the composition does not comprise any oxidation dye or any direct dye.

2. The composition according to claim 1, wherein the pH of the composition ranges from 1 to 7.

3. A process for treating keratin fibres comprising the application to the keratin fibres of the composition as claimed in claim 1.

4. The process according to claim 3, characterized in that it is a process for bleaching keratin fibres.

5. The process according to claim 3, characterized in that it is a process for permanently reshaping keratin fibres.

6. The composition according to claim 1 which is an oxidizing composition.

Description

EXAMPLES

Example 1

(1) Preparation of the Compositions

(2) Compositions A and B are prepared with the ingredients and in the contents as indicated in Table I below.

(3) Composition A is comparative and comprises xanthan gum. Composition B is according to the invention and comprises scleroglucan gum.

(4) The amounts are indicated as grams of active material, unless otherwise indicated.

(5) TABLE-US-00001 TABLE I Ingredients A (comp.) B (inv.) Xanthan gum 1.5 — Scleroglucan gum — 1.5 Tetrasodium etidronate 0.06 0.06 Tetrasodium pyrophosphate 0.04 0.04 Sodium salicylate 0.035 0.035 Hydrogen peroxide 4.5 4.5 Phosphoric acid qs pH = 2.2 ± 0.2 qs pH = 2.2 ± 0.2 Deionized water qs 100 qs 100

(6) T0 for the characterizations of the compositions (cf. below) corresponds to the state of the system 24 hours after adjusting the pH.

(7) Characterizations of the Compositions

(8) The viscosity is measured in the following manner (at atmospheric pressure): ThermoHaake RS600 rheometer equipped with a titanium C60/1° geometry (0.055 mm gap) flow at 25° C. in stages at a shear rate of 10 s.sup.−1 the viscosity of the compositions is measured each week.

(9) Results

(10) FIG. 1a shows the change in viscosity of composition A at room temperature (A1) and at 45° C. (A2) as a function of time (indicated in weeks).

(11) FIG. 2a shows the change in viscosity of composition B at room temperature (B1) and at 45° C. (B2) as a function of time (indicated in weeks).

(12) It is found that composition B according to the invention which comprises scleroglucan gum has a viscosity which varies very little over time, both at room temperature and at 45° C., unlike comparative composition A whose viscosity varies more substantially, especially at 45° C.

(13) Composition B according to the invention is thus more stable than comparative composition A which comprises xanthan gum.

Example 2

(14) Preparation of the Compositions

(15) Compositions C and D are prepared with the ingredients and in the contents as indicated in Table II below.

(16) Composition C is comparative and comprises a non-phosphorus-based sequestrant. Composition D is according to the invention and comprises a phosphorus-based sequestrant.

(17) The amounts are indicated as grams of active material, unless otherwise indicated.

(18) TABLE-US-00002 TABLE II Ingredients C (comp.) D (inv.) Scleroglucan gum 1.5 1.5 Hydrogen peroxide 12 12 Tetrasodium salt of EDTA 0.06 — Tetrasodium etidronate — 0.06 Phosphoric acid qs pH = 2.0 ± 0.2 qs pH = 2.0 ± 0.2 Deionized water qs 100 qs 100

(19) Characterizations of the Compositions

(20) Macroscopic Characterization

(21) Once compositions C and D were prepared, they were stored, either at room temperature or at 45° C.

(22) On the day after preparation, comparative composition C shows bubbles, in a markedly larger number than in composition D according to the invention, manifestly on account of the decomposition of hydrogen peroxide (release of oxygen), this taking place at both storage temperatures.

(23) Viscosity Measurement

(24) The viscosity is measured in the following manner: ThermoHaake RS600 rheometer equipped with a titanium C60/1° geometry (0.055 mm gap) flow at 25° C. in stages at the following shear rates and times: 1 s.sup.−1 (10 min), 10 s.sup.−1 (5 min), 100 s.sup.−1 (2 min) and 1000 s.sup.−1 (30 s).

(25) The viscosity recorded at a given flow rate is that which corresponds to the first stabilized flow rate at less than 1% of the nominal value (for example 1.01) and at equilibrium.

(26) T0 for the characterizations of the compositions (cf. below) corresponds to the state of the system 24 hours after adjusting the pH.

(27) The compositions are stored at 45° C. and the viscosity is measured at T0, at one day (T1), one week (T2) and two weeks (T3).

(28) The viscosity values are given in Tables III and IV below.

(29) TABLE-US-00003 TABLE III Composition C (comparative) Viscosity (in Pa .Math. s) Shear rate (s.sup.−1) T0 T1 T2 T3 1 27.3 28.2 13.0 0.008 10 3.61 3.70 2.42 0.006 100 0.46 0.46 0.36 0.0055 1000 0.075 0.070 0.054 0.0050

(30) TABLE-US-00004 TABLE IV Composition D (invention) Viscosity (in Pa .Math. s) Shear rate (s.sup.−1) T0 T1 T2 T3 1 25.7 29.3 29.1 25.4 10 3.36 3.78 3.97 3.73 100 0.42 0.47 0.49 0.48 1000 0.069 0.073 0.073 0.066

(31) It is found that composition D according to the invention has a low variation in viscosity over time, irrespective of the shear rate, unlike comparative composition C.

(32) Composition D according to the invention is stable over time. On the other hand, comparative composition C is unstable and becomes entirely liquid after a few weeks.