Process for cleaning human keratinous materials

Abstract

A method for cleaning human keratinous materials, comprising the step of subjecting a surface of said keratinous materials to a cosmetic composition containing at least one surfactant, and to acoustic waves emitted by at least one ultrasonic transducer excited by a pulsed or non-pulsed electrical signal, having at least one frequency component between 20 kHz and 100 kHz, a duty cycle Ton / Toff when the signal is pulsed between 20 and 100%, a sound intensity Isata on said surface of at least 0.1 W / cm², and a pulse duration Ton when the signal is pulsed between 0.01 and 1 s, so as to generate bubbles within the cosmetic composition in the vicinity of the surface of said materials to be cleaned and to cause their collapse. Figure for the abstract: Fig. 1

Claims

Demands

1. A method for cleaning human keratinous materials, comprising the step of subjecting a surface to said keratinous materials to a cosmetic composition containing at least one surfactant, and to acoustic waves emitted by at least one ultrasonic transducer excited by a pulsed or non-pulsed electrical signal, having at least one frequency component between 20 kHz and 100 kHz, ratio Cyclic Ton / Toff when the signal is pulsed, between 20 and 100%. of Isata acoustic intensity on said surface comprising at least 0° 1 W / cm²? and pulse duration Ton when the signal is pulsed included between 0.01 and 1s, so as to generate within the composition cosmetic bubbles in the vicinity of the surface of said materials to clean and cause their collapse.

2. Method according to claim |, the acoustic intensity Isata being between 0.1 and 10 W / cm²? better | and 5 W / cm²? even better 3 and 4 W / em:.

3. Method according to any one of the preceding claims, said frequency being between 30 and 100 kHz, in particular between 30 and 45 kHz.

4. Method according to any one of the preceding claims, the electrical signal being pulsed, said pulse duration Ton being between 0.01s and 0.1s, preferably between 0.02 and 0.08 s.

5. Method according to any one of the preceding claims, the electrical signal being pulsed, said duty cycle being between 20% and 100%, Ideally, between 50% and 70%.

6. A method according to any one of the preceding claims, the com- position having a total concentration of surfactant(s) between 0.01% and 20% by weight relative to the total mass of the composition, better between 0.01% and 5%, even better still between 0.1% and 1.5%.

7. Method according to any one of the preceding claims, the distance between the transducer and said surface being between 1 and 30mm, preferably between 3 and 5mm.

8. A method according to any one of the preceding claims, said surface being subjected to acoustic waves for a duration between 0.2 and 10s, better between 2 and 5s.

9. A method according to any one of the preceding claims, in to which an activation voltage is delivered to the transducer allowing to obtain a peak acoustic intensity I greater than or equal to 5 W / cm2.

10. Method according to the preceding claim, with I between 5 and 10 W / cm2, better 6 and 7.5 W / cm2.

11. | Method according to any one of the preceding claims, said surface being subjected to acoustic waves for a duration equal to 4s + / - 0.45, the peak acoustic intensity being equal to 6.2 W / cm² + / - 0.6 W / cm², and: the composition having a total concentration of surfactant(s) between 0.8 and 1.5%, the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 50 and 67%, or, the composition having a total concentration of surfactant(s) equal to 0.5% + / - 0.1%, and the pulse duration Ton being between 0.025 and 0.080 s and the duty cycle being between 50 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 52 and 65%.

12. Method according to any one of claims 1 to 9, said surface being subjected to acoustic waves for a duration equal to 4 s + / - 0.4s, the peak acoustic intensity being equal to 6.8 W / cm² + / - 0.7 W / cm”, and: the composition having a total concentration of surfactant(s) equal to 0.5% + / - 0.1%, and the pulse duration Ton being between 0.027 and 0.080 s and the duty cycle being between 50 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 52 and 67%, Or the composition having a total concentration of surfactant(s) equal to 0.8% + / - 0.1%, and the pulse duration Ton being between 0.030 and 0.080 s and the duty cycle being between 50 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 52 and 67%, the composition having a total concentration of surfactant(s) equal to 1.0% ± 0.1%, and the pulse duration Ton being between 0.035 and 0.080 s and the duty cycle being between 50 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 52.5% and 67%, the composition having a total concentration of surfactant(s) equal to 1.2% ± 0.1%, and the pulse duration Ton being between 0.035 and 0.080 s and the duty cycle being between 51.5 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 54 and 67%, the composition having a total concentration of surfactant(s) equal to 1.5% ± 0.1%, and the pulse duration Ton being between 0.038 and 0.080 s and the duty cycle being between 54 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 57.5 and 67%.

13. | A method according to any one of claims 1 to 9, wherein said surface is subjected to acoustic waves for a duration of 4 s + / - 0.4 s, the peak acoustic intensity being 7.2 W / cm² + / - 0.7 W / cm², and: the composition having a total concentration of surfactant(s) equal to 0.5% + / - 0.1%, the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 50 and 67%, Or the composition having a total concentration of surfactant(s) equal to 0.8% ± 0.1%, and the pulse duration Ton being between 0.030 and 0.070 s and the duty cycle being between 51 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 52.5% and 67%, Or the composition having a total concentration of surfactant(s) equal to 1.0% + / - 0.1%, and the pulse duration Ton being between 0.030 and 0.070 s and the duty cycle being between 52.5 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 55 and 67%, Or the composition having a total concentration of surfactant(s) equal to 1.2% + / - 0.1%, and the pulse duration Ton being between 0.025 and 0.070 s and the duty cycle being between 56 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 59 and 67%, Or the composition having a total concentration of surfactant(s) equal to 1.5% + / - 0.1%, the pulse duration Ton being between 0.028 and 0.045 s and the duty cycle being between 59 and 63%.

14. A method according to any one of the preceding claims, wherein said surface is subjected to acoustic waves for a duration of 3 s + / - 0.35, the peak acoustic intensity being 6.2 W / cm² + / - 0.6 W / cm², and: the composition having a total concentration of surfactant(s) equal to 0.5% ± 0.1%, and the pulse duration Ton being between 0.070 and 0.080 s and the duty cycle being between 54 and 60.5%, or the pulse duration Ton being between 0.055 and 0.078 s and the duty cycle being between 56 and 62%, Or the composition having a total concentration of surfactant(s) equal to 0.8% + / - 0.1%, and the pulse duration Ton being between 0.040 and 0.080 s and the duty cycle being between 51 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 56 and 67%, Or the composition having a total concentration of surfactant(s) equal to 1.0% + / - 0.1%, and the pulse duration Ton being between 0.035 and 0.080 s and the duty cycle being between 51.5 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 54 and 67%, Or the composition having a total concentration of surfactant(s) equal to 1.2% ± 0.1%, and the pulse duration Ton being between 0.040 and 0.080 s and the duty cycle being between 51.5 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 54 and 67%, Or the composition having a total concentration of surfactant(s) equal to 1.5% ± 0.1%, and the pulse duration Ton being between 0.035 and 0.080 s and the duty cycle being between 55 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 57 and 67%.

15. A method according to any one of the preceding claims, wherein said surface is subjected to acoustic waves for a duration of 3 s + / - 0.35, the peak acoustic intensity being 6.8 W / cm² + / - 0.7 W / cm², and: the composition having a total concentration of surfactant(s) equal to 0.5% ± 0.1%, and the pulse duration Ton being between 0.020 and 0.065 s and the duty cycle being between 56 and 67%, or the pulse duration Ton being between 0.035 and 0.075 s and the duty cycle being between 53.5% and 64%, the composition having a total concentration of surfactant(s) equal to 0.8% ± 0.1%, and the pulse duration Ton being between 0.030 and 0.072 s and the duty cycle being between 53 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 55 and 64.5%, the composition having a total concentration of surfactant(s) equal to 1.0% ± 0.1%, and the pulse duration Ton being between 0.032 and 0.070 s and the duty cycle being between 54 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 56 and 64.5%, the composition having a total concentration of surfactant(s) equal to 1.2% ± 0.1%, and the pulse duration Ton being between 0.032 and 0.070 s and the duty cycle being between 55.5 and 67%, or the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 58 and 64%, Or the composition having a total concentration of surfactant(s) equal to 1.5% + / - 0.1%, and the pulse duration Ton being between 0.025 and 0.063 s and the duty cycle being between 61.5 and 67%, or the pulse duration Ton being between 0.030 and 0.058 s and the duty cycle being between 60 and 607%.

16. A method according to any one of the preceding claims, wherein said surface is subjected to acoustic waves for a duration of 3 s + / - 0.35, the peak acoustic intensity being 7.2 W / cm² + / - 0.7 W / cm², and: the composition having a total concentration of surfactant(s) equal to 0.5% ± 0.1%, and the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 57 and 65%, or the pulse duration Ton being between 0.030 and 0.065 s and the duty cycle being between 55 and 67%, Or the composition having a total concentration of surfactant(s) equal to 0.8% + / - 0.1%, and the pulse duration Ton being between 0.020 and 0.080 s and the duty cycle being between 58 and 67%, or the pulse duration Ton being between 0.020 and 0.068 s and the duty cycle being between 55 and 67%, Or the composition having a total concentration of surfactant(s) equal to 1.0% + / - 0.1%, and the pulse duration Ton being between 0.020 and 0.0725 s and the duty cycle being between 58.5 and 67%, or the pulse duration Ton being between 0.020 and 0.0575 s and the duty cycle being between 56 and 67%, Or the composition having a total concentration of surfactant(s) equal to 1.2% ± 0.1%, and the pulse duration Ton being between 0.020 and 0.060 s and the duty cycle being between 61 and 67%, or the pulse duration Ton being between 0.020 and 0.046 s and the duty cycle being between 58.5 and 67%.

17. A device for treating human keratinous materials, in particular for carrying out the process according to any one of the preceding claims, the device comprising at least one ultrasonic transducer arranged to emit acoustic waves in a fluid present in the vicinity of said materials to be cleaned, the transducer being powered by a current generator delivering to it an electrical signal, pulsed or non-pulsed, this electrical signal preferably having: at least one frequency component between 20 kHz and 100 kHz, a duty cycle Ton / Toff ratio when the signal is pulsed between 20 and 100%, and / or a pulse duration (Ton) when the signal is pulsed between 0.01 and 1s, the acoustic intensity Isata on the surface of said keratinous materials being preferably at least 0.1 W / cm?.