Dispersions comprising at least one non-volatile hydrocarbon oil
A dispersion containing a dispersed phase comprising drops and a continuous aqueous phase, preferably in the form of gel, in which the drops comprise a fatty phase containing at least one gelling agent, and in which the fatty phase comprises at least one non-volatile hydrocarbon oil H1 containing more than 90%, and preferably more than 95%, fatty acids having at least 18 carbon atoms and preferably at least 20 carbon atoms.
1. A dispersion containing a dispersed phase comprising drops and a continuous aqueous phase, wherein the drops comprise a fatty phase containing at least one gelling agent, and wherein the fatty phase comprises at least one non-volatile hydrocarbon oil H1 containing more than 90% of fatty acids having at least 20 carbon atoms, wherein oil H1 comprises more than 90% of fatty acids selected from the group consisting of: eicosenoic acid, docosanoic acid, docosadienoic acid, and mixtures thereof.
2. The dispersion of claim 1 , wherein at least 60% of the drops have a mean diameter larger than or equal to 100 μm.
3. The dispersion of claim 1 , wherein the drops having a diameter larger than or equal to 100 μm represent a volume greater than or equal to 60% of the total volume of the dispersed phase.
4. The dispersion of claim 1 , wherein the drops comprise a shell.
5. The dispersion of claim 1 , wherein the fatty phase comprises between 1% and 50% by weight of oil(s) H1 relative to the total weight of said fatty phase.
6. The dispersion of claim 1 , wherein oil H1 is selected from among vegetable oils.
7. The dispersion of claim 1 , wherein the gelling agent is selected from the group consisting of: organic or mineral, polymeric or molecular lipophilic gelling agents; fats solid at ambient temperature and pressure, and mixtures thereof.
8. The dispersion of claim 1 , comprising from 0.5% to 99% by weight of gelling agent(s) relative to the total weight of the fatty phase.
9. The dispersion of claim 1 , characterized in that it does not comprise a surfactant.
10. A composition comprising a dispersion of claim 1 , in association with a physiologically acceptable medium.
11. The dispersion of claim 1 , wherein the drops comprise a shell, said shell comprising at least one anionic polymer and at least one cationic polymer.
12. The dispersion of claim 11 , wherein the cationic polymer is a silicone polymer modified by a primary, secondary or tertiary amine function.
13. The dispersion of claim 11 , wherein the anionic polymer is a polymer comprising monomer units including at least one carboxylic acid chemical function.
14. The dispersion of claim 11 , wherein the cationic polymer has the following formula:
where:
R 1 , R 2 and R 3 are each independently OH or CH 3 ;
R 4 is a group —CH 2 — or group —X—NH— where X is a C3 or C4 divalent alkylene radical;
x is an integer of between 10 and 5 000;
y is an integer of between 2 and 1 000; and
z is an integer of between 0 and 10.
15. The dispersion of claim 11 , wherein the anionic polymer is selected from among carbomers and acrylates/C 10-30 alkyl acrylate crosslinked copolymers.
16. The composition of claim 1 , wherein the non-volatile hydrocarbon oil H1 contains more than 95% of fatty acids having at least 20 carbon atoms.
17. A method for preparing a dispersion of claim 1 , comprising the following steps:
optionally, heating an oily fluid FI to a temperature of between 40° C. and 150° C.;
contacting an aqueous fluid FE with the oily fluid FI; and
forming drops of fatty phase composed of the oily fluid FI dispersed in a continuous aqueous phase composed of fluid FE, said drops optionally comprising a shell isolating the core of fatty phase drops of the dispersion,
wherein:
the oily fluid FI comprises at least one gelling agent and at least one non-volatile hydrocarbon oil H1 containing more than 90% of fatty acids having at least 20 carbon atoms and optionally at least one cationic polymer, and
the aqueous fluid FE at least comprises water and optionally at least one anionic polymer.
18. A non-therapeutic method for the cosmetic treatment of keratin material, comprising a step of applying to said keratin material a dispersion of claim 1 .
19. A method to (i) improve the transparency of a dispersion of claim 1 by reducing or preventing:
the opacification phenomenon of the continuous aqueous phase,
the leakage of material from the dispersed phase towards the continuous aqueous phase,
the drop adhesion onto the walls of packaging, and/or
the drop aggregation, and (ii) to maintain or improve the stability over time and the visual impact of said dispersion,
said method involving the use of at least one non-volatile hydrocarbon oil H1 containing more than 90% of fatty acids having at least 20 carbon atoms.
20. The method of claim 19 , wherein the material comprises oil(s) and/or gelling agent(s).
21. A non-therapeutic method for the cosmetic treatment of keratin material, comprising a step of applying to said keratin material at least one layer of a cosmetic composition of claim 10 .