Cosmetic composition for coating keratin fibres

1. A cosmetic composition, comprising:

an aqueous phase,

a surfactant system present at a total content of greater than or equal to 15% by weight relative to the total weight of the composition, the surfactant system comprising:

i) a nonionic surfactant with an HLB value at 25° C. of less than 8, and

ii) a nonionic surfactant with an HLB value at 25° C. of greater than or equal to 8, together forming a lamellar phase Lβ, wherein the nonionic surfactant with an HLB value at 25° C. of less than 8 and/or the surfactant with an HLB value at 25° C. of greater than or equal to 8 has a formula (I):

(ALK-[C(O)] a [O] b ) c —X  (I)

wherein:

ALK is a C 7 -C 23 alkyl group,

a and b are integers from 0 to 100, with the proviso that when a or b is 0, both a and b are 0,

c is an integer from 1 to 100, and

X is a (poly)oxyalkylene group optionally substituted and/or terminated with a hydroxyl group,

wherein the nonionic surfactant with an HLB value at 25° C. of less than 8 and the nonionic surfactant with an HLB value at 25° C. of greater than or equal to 8 are present in a total content of greater than or equal to 15% relative to the total weight of the composition, and

an aqueous dispersion of particles of at least one film-forming polymer,

wherein the composition optionally comprises a wax in a total content of less than 10% by weight relative to the total weight of the composition.

2. The composition of claim 1 , wherein X is (i) or (ii):

HO-(ALK-O) z —CH 2 —CH[(OALK) y —OH]—CH 2 —(O-ALK) x -(*)  i)

wherein:

ALK, which may be identical or different, represent a C1-C6 alkylene group, and

x, y and z are each an integer from 0 to 200, wherein x+y+z is not 0;

H-(ALK-O) x —(*) or H—(O-ALK) x -(*),  ii)

wherein:

ALK, which may be identical or different, represent a C1-C6 ethylene group, and

x is an integer other than 0.

3. The composition of claim 1 , wherein the nonionic surfactant with an HLB value at 25° C. of less than 8 and/or the nonionic surfactant with an HLB value of greater than or equal to 8 has a formula (I′):

ALK-(O—CH 2 —CH 2 ) n —OH  (I′)

wherein:

ALK is a C 8 -C 24 alkyl group,

n is an integer from 1 to 200 for the nonionic surfactant with an HLB value at 25° C. of less than 8, and from 10 to 200 for the nonionic surfactant with an HLB value at 25° C. of greater than or equal to 8.

4. The composition of claim 1 , wherein the nonionic surfactant with an HLB value at 25° C. of less than 8 is:

an ester or ether of a monosaccharide which is optionally (poly)oxyalkylenated;

an ester of a fatty acid and of a polyol, which is optionally (poly)oxyalkylenated;

an alcohol which is optionally (poly)oxyalkylenated;

or a mixture thereof.

5. The composition of claim 1 , wherein the nonionic surfactant with an HLB value at 25° C. of less than 8 is an ether of a C 8 -C 24 fatty alcohol and of polyethylene glycol, the ether comprising from 1 to 10 ethylene glycol units.

6. The composition of claim 1 , wherein the nonionic surfactant with an HLB value at 25° C. of greater than or equal to 8 is:

a (poly)oxyalkylenated glycerol ether,

a (poly)oxyalkylenated alcohol,

a fatty acid ester of a (poly)oxyalkylenated polyethylene glycol,

a fatty acid ester of a (poly)oxyalkylenated glyceryl ether,

a fatty acid ester of a (poly)oxyalkylenated sorbitol ether,

or a mixture thereof.

7. The composition of claim 1 , wherein the nonionic surfactant with an HLB value at 25° C. of greater than or equal to 8 is at least one C 8 -C 24 fatty alcohol ether of polyethylene glycol, the ether comprising more than 10 ethylene glycol units.

8. The composition of claim 1 , wherein the aqueous phase is present in an amount ranging from 30% to 70% by weight relative to the total weight of the composition.

9. The composition of claim 1 , wherein the nonionic surfactant with an HLB value at 25° C. of greater than or equal to 8 is present in a content of greater than or equal to 5% by weight relative to the total weight of the composition.

10. The composition of claim 1 , wherein the nonionic surfactant with an HLB value at 25° C. of less than 8 is present in a content of greater than or equal to 5% by weight relative to the total weight of the composition.

11. The composition of claim 1 , wherein the nonionic surfactant with an HLB value at 25° C. of less than 8 and the nonionic surfactant with an HLB value at 25° C. of greater than or equal to 8 are present in a respective total content such that the weight ratio of the nonionic surfactant with an HLB value at 25° C. of less than 8 to the nonionic surfactant with an HLB value at 25° C. of greater than or equal to 8 ranges from 1:5 to 5:1.

12. The composition of claim 1 , wherein the particles of film-forming polymer present in the aqueous dispersion are synthetic polymers, polymers of natural origin, or a mixture thereof.

13. The composition of claim 1 , wherein the aqueous dispersion is an acrylic polymer dispersion, a polyurethane dispersion, a sulfopolyester dispersion, a dispersion of vinyl homopolymer, a dispersion of vinyl copolymer, a dispersion of polyurethane/polyacrylic hybrid polymers, a dispersion of core-shell particles, or a mixture thereof.

14. The composition of claim 1 , wherein the total content of film-forming polymer particles and the total content of surfactant system are such that the weight ratio of the film-forming polymer particles/the surfactant system is less than or equal to 1.75:1.

15. The composition of claim 1 , further comprising a pulverulent substance colorant.

16. The composition of claim 1 , having a viscosity at 25° C. ranging from 5 to 50 Pa·s.

17. A process for coating a keratin fiber, comprising applying the composition of claim 1 to the keratin fiber.

18. The composition of claim 1 , further comprising a wax in a total content of less than 10% by weight relative to the total weight of the composition.