COSMETIC HAIR COMPOSITION IN THE FORM OF A NANOEMULSION COMPRISING A PARTICULAR NON-IONIC SURFACTANT AND A PROPELLANT

Abstract

The present invention relates to a cosmetic composition in the form of a nanoemulsion comprising at least one particular non-ionic surfactant, at least one fatty substance, water and at least one propellant. The invention also relates to an aerosol device and also to a process for styling keratin fibres using such a composition.

Claims

1. A cosmetic composition in the form of a nanoemulsion of oil-in-water type, comprising: at least one non-ionic surfactant of formula (I):
R—O—(CH.sub.2—CH.sub.2—O).sub.n—H  (I) in which: R is a linear or branched C.sub.8-C.sub.40 alkenyl radical, n is an integer ranging from 6 to 20; (ii) one or more fatty substances having a melting point less than or equal to 35° C. at atmospheric pressure; (iii) one or more propellants; and (iv) water.

2. The composition according to claim 1, wherein R represents a linear or branched C.sub.16-C.sub.20 alkenyl radical; and/or n represents an integer ranging from 8 to 12.

3. The composition according to claim 1, wherein at least one non-ionic surfactant of formula (I) is chosen from oleyl alcohol comprising 8 mol of ethylene oxide, oleyl alcohol comprising 10 mol of ethylene oxide, oleyl alcohol comprising 12 mol of ethylene oxide.

4. The composition according to claim 1, wherein the total content of the non-ionic surfactant(s) of formula (I) is between 0.1% and 15% by weight relative to the total weight of the composition.

5. The composition according to claim 1, wherein the fatty substance(s) (ii) are chosen from fatty substances that are liquid at 28° C. and at atmospheric pressure.

6. The composition according to claim 1, wherein it comprises at least two fatty substances having a melting point less than or equal to 35° C. at atmospheric pressure, one of said fatty substances being chosen from hydrocarbons, and the other of said fatty substances from vegetable oils.

7. The composition according to claim 1, wherein the weight ratio of the content of non-ionic surfactant(s) of formula (I) to the content of the fatty substance(s) (ii), is inclusively between 0.05 and 20.

8. The composition according to claim 1, wherein the propellant(s) are chosen from volatile hydrocarbons which are optionally halogenated, dimethyl ether, and mixtures thereof.

9. The composition according to claim 1, wherein the total content of the propellant(s) is between 0.1% and 20% by weight relative to the total weight of the composition.

10. The composition according to claim 1, wherein that the propellant(s) used are entirely dispersed in the composition before the first use of the composition.

11. Composition according to claim 1, wherein it also comprises one or more fixing polymers chosen from non-ionic fixing polymers, amphoteric fixing polymers, anionic fixing polymers, cationic fixing polymers, and mixtures thereof; preferably chosen from non-ionic fixing polymers, anionic fixing polymers, and mixtures thereof; more preferentially chosen from non-ionic fixing polymers; even more preferentially chosen from vinyllactam homopolymers such as vinylpyrrolidone homopolymers and polyvinylcaprolactam, and vinyllactam copolymers, such as poly(vinylpyrrolidone/vinyllactam) copolymers and poly(vinylpyrrolidone/vinyl acetate) copolymers, and mixtures thereof; preferably in a total amount ranging from 0.1% to 20% by weight, more preferentially from 0.2% to 15% by weight, 0.5% to 10% by weight, better still from 1% to 5% by weight, relative to the total weight of the composition.

12. An aerosol device comprising a composition as defined according to claim 1, a container containing said composition, and a means for spraying said composition.

13. The aerosol device according to claim 12, which makes it possible to spray said composition in the form of a mousse.

14. The aerosol device according to claim 12, wherein the container is transparent.

15. A process for styling keratin fibres comprising the application to said fibres of the composition as defined in claim 1, this application being optionally followed by rinsing after an optional leave-on time.

16. The composition according to claim 2, wherein at least one non-ionic surfactant of formula (I) is chosen from oleyl alcohol comprising 8 mol of ethylene oxide, oleyl alcohol comprising 10 mol of ethylene oxide, oleyl alcohol comprising 12 mol of ethylene oxide.

17. The composition according to claim 2, wherein the total content of the non-ionic surfactant(s) of formula (I) is between 0.1% and 15% by weight relative to the total weight of the composition.

18. The composition according to claim 3, wherein the total content of the non-ionic surfactant(s) of formula (I) is between 0.1% and 15% by weight relative to the total weight of the composition.

19. The composition according to claim 2, wherein the fatty substance(s) (ii) are chosen from fatty substances that are liquid at 28° C. and at atmospheric pressure.

20. The composition according to claim 3, wherein the fatty substance(s) (ii) are chosen from fatty substances that are liquid at 28° C. and at atmospheric pressure.

Description

EXAMPLES

[0392] The following nanoemulsions of oil-in-water type A, B, C and D were prepared from the ingredients detailed in the table below, in which all the amounts are indicated as weight percentages of active material (AM) relative to the total weight of the composition.

TABLE-US-00001 Composition A: Content (weight Ingredients % of AM) Oleth-10 14.25 Coconut oil 8.08 Liquid paraffin 8.08 Isobutane/propane/butane mixture 5 Water qs 100

TABLE-US-00002 Composition B: Content (weight Ingredients % of AM) Oleth-10 14.25 Coconut oil 8.08 Liquid paraffin 8.08 Vinylpyrrolidone/vinyl acetate 0.48 copolymer Isobutane/propane/butane mixture 5 Water qs 100

TABLE-US-00003 Composition C: Content (weight Ingredients % of AM) Oleth-10 14.25 Coconut oil 8.08 2-Ethylhexyl stearate 8.08 Isobutane/propane/butane mixture 5 Water qs 100

TABLE-US-00004 Composition D: Content (weight Ingredients % of AM) Oleth-10 14.25 Coconut oil 8.08 2-Ethylhexyl stearate 8.08 Vinylpyrrolidone/vinyl acetate 0.48 copolymer Sodium chloride 0.04 Isobutane/propane/butane mixture 5 Water qs 100

TABLE-US-00005 Composition E: Content (weight Ingredients % of AM) Oleth-10 3.56 Coconut oil 2.02 Liquid paraffin 2.02 Vinylpyrrolidone/vinyl acetate copolymer 1.9 Cetyltrimethylammonium chloride 0.9 Oleocetyldimethylhydroxyethylammonium 0.57 chloride Quaternium-80 0.48 Glycerin 4.75 Propylene glycol 0.47 Isobutane/propane/butane mixture 5 Water qs 100

TABLE-US-00006 Composition F: Content (weight % Ingredients of AM) Oleth-10 9.98 Coconut oil 5.65 Liquid paraffin 5.65 Isobutane/propane/butane mixture 5 Water qs 100

[0393] The compositions above have been prepared according to a phase inversion (PIT) process comprising the following steps: [0394] the non-ionic surfactant of formula (I) and the water are mixed and heated to 50° C.; then [0395] the fatty substances (ii), having a melting point less than or equal to 35° C. at atmospheric pressure, are added to the mixture and heated to 80° C.; then [0396] the solution obtained is cooled to 25° C. by thermal shock; then [0397] the other ingredients are added to the solution, and optionally the solution can be diluted up to 25% for example.

[0398] At this stage of the process, the oil particles of the prepared solutions have a number-average size of about 11.5 nm, and the turbidity of the prepared solutions is about 70 NTU units, measured at ambient temperature (25° C.) and atmospheric pressure.

[0399] The number-average size of the particles (or oil drops) has been determined according to the known Dynamic Light Scattering (DLS) method with the Zetasizer Nano ZS granulometer from Malvern Instrument. This granulometer is equipped with a standard laser (Helium-Neon) of 4 mW of power at a wavelength λ of 633 nm.

[0400] For this purpose, the prepared solutions have been previously diluted with distilled water with a dilution ratio of 1:100, and the temperature of each sample has been regulated at 25° C.

[0401] The NNLS (Non-Negatively Least Squares) correlation function is used to analyse the data.

[0402] The turbidity measurements of the prepared solutions have been carried out with a turbidimeter, model HI 88713-ISO from the company Hanna Instruments.

[0403] Then, the mixture of C.sub.3-C.sub.5 alkanes is emulsified into the prepared solutions, to obtain the compositions according to the invention. The mixture of C.sub.3-C.sub.5 alkanes is entirely dispersed in the composition and does not form a separate layer.

[0404] The nanoemulsions of oil-in-water type A, B, C, D and E above are clear, with a single-phase appearance.

[0405] The single-phase appearance and the clarity of the composition are stable over time. In particular, after 2 months of storage at ambient temperature (25° C.), the appearance of the composition has not changed.

[0406] Each composition A, B, C, D and E above was packaged in an aerosol device comprising a container containing said composition, and a means for spraying said composition (Equipment: a Valve Precision P14105 or GI 2×0.51 mm, and a diffuser DMPR229).

[0407] On spraying, a firm, creamy mousse is obtained, which spreads easily on the head of hair and gives good styling and cosmetic properties, in particular with long-lasting fixing and a pleasant feel. The hair is soft, and has volume. The hairstyle obtained is natural, with no helmet effect.