Process for the elongation and/or densification of fibers

1. A method for the elongation and/or densification of fibers, on a keratin material, comprising applying an adhesive cosmetic composition to the fibers and/or to the keratin material;

wherein the composition comprises:

one volatile hydrocarbon-based oil,

particles of at least one polymer that is surface-stabilized with a stabilizer, the polymer of the particles being a C 1 -C 4 alkyl (meth)acrylate polymer; the stabilizer being an isobornyl (meth)acrylate polymer chosen from isobornyl (meth)acrylate homopolymer and statistical copolymers of isobornyl (meth)acrylate and of C 1 -C 4 alkyl (meth)acrylate present in an isobornyl (meth)acrylate/C 1 -C 4 alkyl (meth)acrylate weight ratio of greater than 4; and

a hydrophobic film-forming polymer.

2. The method as claimed in claim 1 , wherein said particles are in dispersion in a non-aqueous medium containing at least the volatile hydrocarbon-based oil.

3. The method as claimed in claim 1 , wherein the hydrocarbon-based oil(s) is(are) present in the composition in a content ranging from 20% to 70% by weight relative to the total weight of the composition.

4. The method as claimed in claim 1 , wherein the particles of the polymer(s) are present in an amount ranging from 3% to 40% by weight relative to the total weight of the composition.

5. The method as claimed in claim 1 , wherein the polymer(s) of the particles is(are) one (or more) methyl acrylate and/or ethyl acrylate polymer(s).

6. The method as claimed in claim 1 , wherein the polymer(s) of the particles comprise(s) an ethylenically unsaturated acid monomer or the anhydride thereof.

7. The method as claimed in claim 1 , wherein the polymer(s) of the particles comprise(s) from 80% to 100% by weight of C 1 -C 4 alkyl (meth)acrylate and from 0% to 20% by weight of ethylenically unsaturated acid monomer, relative to the total weight of the polymer, the polymer(s) of the particles being selected from the group consisting of:

methyl acrylate homopolymers,

ethyl acrylate homopolymers,

methyl acrylate/ethyl acrylate copolymers,

methyl acrylate/ethyl acrylate/acrylic acid copolymers,

methyl acrylate/ethyl acrylate/maleic anhydride copolymers,

methyl acrylate/acrylic acid copolymers,

ethyl acrylate/acrylic acid copolymers,

methyl acrylate/maleic anhydride copolymers and

ethyl acrylate/maleic anhydride copolymers.

8. The method as claimed in claim 1 , wherein the stabilizer(s) is(are) a statistical copolymer of isobornyl (meth)acrylate and of C 1 -C 4 alkyl (meth)acrylate present in an isobornyl (meth)acrylate/C 1 -C 4 alkyl (meth)acrylate weight ratio of greater than or equal to 5.

9. The process as claimed in claim 1 , wherein the stabilizer(s) is(are) selected from the group consisting of:

isobornyl acrylate homopolymers,

statistical copolymers of isobornyl acrylate/methyl acrylate,

statistical copolymers of isobornyl acrylate/methyl acrylate/ethyl acrylate, and

statistical copolymers of isobornyl methacrylate/methyl acrylate.

10. The method as claimed in claim 1 , wherein the combination of the stabilizer(s)+polymer(s) of the particles comprises from 10% to 50% by weight of polymerized isobornyl (meth)acrylate and from 50% to 90% by weight of polymerized C 1 -C 4 alkyl (meth)acrylate, relative to the total weight of the combination of the stabilizer+polymer of the particles.

11. The method as claimed in claim 1 , wherein the composition comprises less than 5% by weight of water relative to the total weight of the composition.

12. The method as claimed in claim 1 , wherein the hydrophobic film-forming polymer is a hydrocarbon-based diblock copolymer.

13. The method as claimed in claim 1 , wherein the hydrophobic film-forming polymer is a hydrocarbon-based block copolymer present in the composition in a content ranging from 0% to 18% by weight relative to the total weight of the composition.

14. The method as claimed in claim 1 , wherein the hydrophobic film-forming polymer is a hydrocarbon-based resin selected from the group consisting of indene hydrocarbon-based resins, aliphatic pentadiene resins, mixed resins of pentanediene and of indene, diene resins of cyclopentanediene dimers, diene resins of isoprene dimers and mixtures thereof.

15. The method as claimed in claim 1 wherein the hydrophobic film-forming polymer is a hydrocarbon-based resin(s) present in a content ranging from 0% to 70% by weight relative to the total weight of the composition.

16. The method as claimed in claim 1 , wherein the composition further comprises a styrene-ethylene/propylene diblock copolymer and an indene hydrocarbon-based resin.

17. The method as claimed in claim 1 , wherein the composition further comprises at least one colorant.