Process for the elongation and/or densification of fibers

Abstract

The present invention relates to a process for the elongation and/or densification of fibers, on a keratin material, characterized in that it employs a composition, especially a cosmetic composition, in particular a makeup composition, comprising at least: —one volatile hydrocarbon-based oil, —particles of at least one polymer surface-stabilized with a stabilizer, and —a hydrophobic film-forming polymer, chosen from hydrocarbon-based block copolymers, hydrocarbon-based resins, and mixtures thereof.

Claims

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.sub.1-C.sub.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.sub.1-C.sub.4 alkyl (meth)acrylate present in an isobornyl (meth)acrylate/C.sub.1-C.sub.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.sub.1-C.sub.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.sub.1-C.sub.4 alkyl (meth)acrylate present in an isobornyl (meth)acrylate/C.sub.1-C.sub.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.sub.1-C.sub.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.

Description

I. EXAMPLES OF PREPARATION OF DISPERSIONS

Example 1

(1) In a first step, 1300 g of isododecane, 337 g of isobornyl acrylate, 28 g of methyl acrylate and 3.64 g of tert-butyl peroxy-2-ethylhexanoate (Trigonox 21S from Akzo) were placed in a reactor. The isobornyl acrylate/methyl acrylate mass ratio is 92/8. The mixture was heated to 90° C. under argon with stirring.

(2) After 2 hours of reaction, 1430 g of isododecane were added to the reactor feedstock and the mixture was heated to 90° C.

(3) In a second step, a mixture of 1376 g of methyl acrylate, 1376 g of isododecane and 13.75 g of Trigonox 21S were run in over 2 hours 30 minutes, and the mixture was left to react for 7 hours. 3.3 liters of isododecane were then added and part of the isododecane was evaporated off to obtain a solids content of 50% by weight.

(4) A dispersion of methyl acrylate particles stabilized with a statistical copolymer stabilizer containing 92% isobornyl acrylate and 8% methyl acrylate in isododecane was obtained.

(5) The oily dispersion contains in total (stabilizer+particles) 80% methyl acrylate and 20% isobornyl acrylate.

(6) The polymer particles of the dispersion have a number-average size of about 160 nm.

(7) The dispersion is stable after storage for 7 days at room temperature (25° C.).

Example 2

(8) A dispersion of polymer in isododecane was prepared according to the preparation method of example 1, using:

(9) Step 1: 275.5 g of isobornyl acrylate, 11.6 g of methyl acrylate, 11.6 g of ethyl acrylate, 2.99 g of Trigonox 21, 750 g of isododecane; followed by addition, after reaction, of 750 g of isododecane.

(10) Step 2: 539.5 g of methyl acrylate, 539.5 g of ethyl acrylate, 10.8 g of Trigonox 21S, 1079 g of isododecane. After reaction, addition of 2 liters of isododecane and evaporation to obtain a solids content of 35% by weight.

(11) A dispersion in isododecane of methyl acrylate/ethyl acrylate (50/50) copolymer particles stabilized with an isobornyl acrylate/methyl acrylate/ethyl acrylate (92/4/4) statistical copolymer stabilizer was obtained.

(12) The oily dispersion contains in total (stabilizer+particles) 40% methyl acrylate, 40% ethyl acrylate and 20% isobornyl acrylate.

(13) The dispersion is stable after storage for 7 days at room temperature (25° C.).

Example 3

(14) A dispersion of polymer in isododecane was prepared according to the preparation method of example 1, using:

(15) Step 1: 315.2 g of isobornyl acrylate, 12.5 g of methyl acrylate, 12.5 g of ethyl acrylate, 3.4 g of Trigonox 21, 540 g of isododecane, 360 g of ethyl acetate; followed by addition, after reaction, of 540 g of isododecane and 360 g of ethyl acetate.

(16) Step 2: 303 g of methyl acrylate, 776 g of ethyl acrylate, 157 g of acrylic acid, 11 g of Trigonox 21S, 741.6 g of isododecane and 494.4 g of ethyl acetate. After reaction, addition of 3 liters of an isododecane/ethyl acetate mixture (60/40 weight/weight) and total evaporation of the ethyl acetate and partial evaporation of the isododecane to obtain a solids content of 44% by weight.

(17) A dispersion in isododecane of methyl acrylate/ethyl acrylate/acrylic acid (24.5/62.8/12.7) copolymer particles stabilized with an isobornyl acrylate/methyl acrylate/ethyl acrylate (92/4/4) statistical copolymer stabilizer was obtained.

(18) The oily dispersion contains in total (stabilizer+particles) 10% acrylic acid, 20% methyl acrylate, 50% ethyl acrylate and 20% isobornyl acrylate.

(19) The dispersion is stable after storage for 7 days at room temperature (25° C.).

Example 4

(20) A dispersion of polymer in isododecane was prepared according to the preparation method of example 1, using:

(21) Step 1: 315.2 g of isobornyl acrylate, 12.5 g of methyl acrylate, 12.5 g of ethyl acrylate, 3.4 g of Trigonox 21, 540 g of isododecane, 360 g of ethyl acetate; followed by addition, after reaction, of 540 g of isododecane and 360 g of ethyl acetate.

(22) Step 2: 145 g of methyl acrylate, 934 g of ethyl acrylate, 157 g of acrylic acid, 12.36 g of Trigonox 21S, 741.6 g of isododecane and 494.4 g of ethyl acetate. After reaction, addition of 3 liters of an isododecane/ethyl acetate mixture (60/40 weight/weight) and total evaporation of the ethyl acetate and partial evaporation of the isododecane to obtain a solids content of 44% by weight.

(23) A dispersion in isododecane of methyl acrylate/ethyl acrylate/acrylic acid (11.7/75.6/12.7) copolymer particles stabilized with an isobornyl acrylate/methyl acrylate/ethyl acrylate (92/4/4) statistical copolymer stabilizer was obtained.

(24) The oily dispersion contains in total (stabilizer+particles) 10% acrylic acid, 10% methyl acrylate, 60% ethyl acrylate and 20% isobornyl acrylate.

(25) The dispersion is stable after storage for 7 days at room temperature (25° C.).

Example 5

(26) A dispersion of polymer in isododecane was prepared according to the preparation method of example 1, using:

(27) Step 1: 48 g of isobornyl acrylate, 2 g of methyl acrylate, 2 g of ethyl acrylate, 0.52 g of Trigonox 21, 57.6 g of isododecane, 38.4 g of ethyl acetate; followed by addition, after reaction, of 540 g of isododecane and 360 g of ethyl acetate.

(28) Step 2: 98 g of methyl acrylate, 73 g of ethyl acrylate, 25 g of maleic anhydride, 1.96 g of Trigonox 21S, 50.4 g of isododecane and 33.60 g of ethyl acetate. After reaction, addition of 1 liter of an isododecane/ethyl acetate mixture (60/40 weight/weight) and total evaporation of the ethyl acetate and partial evaporation of the isododecane to obtain a solids content of 46.2% by weight.

(29) A dispersion in isododecane of methyl acrylate/ethyl acrylate/maleic anhydride (50/37.2/12.8) copolymer particles stabilized with an isobornyl acrylate/methyl acrylate/ethyl acrylate (92/4/4) statistical copolymer stabilizer was obtained.

(30) The oily dispersion contains in total (stabilizer+particles) 10% maleic anhydride, 30% methyl acrylate, 40% ethyl acrylate and 20% isobornyl acrylate.

(31) The dispersion is stable after storage for 7 days at room temperature (25° C.).

Example 6

(32) A dispersion of polymer in isododecane was prepared according to the preparation method of example 1, using:

(33) Step 1: 48.5 g of isobornyl methacrylate, 4 g of methyl acrylate, 0.52 g of Trigonox 21, 115 g of isododecane; followed by addition, after reaction, of 80 g of isododecane.

(34) Step 2: 190 g of methyl acrylate, 1.9 g of Trigonox 21S, 190 g of isododecane. After reaction, addition of 1 liter of isododecane and partial evaporation of the isododecane to obtain a solids content of 48% by weight.

(35) A dispersion in isododecane of methyl acrylate polymer particles stabilized with an isobornyl methacrylate/methyl acrylate (92/8) statistical copolymer stabilizer was obtained.

(36) The oily dispersion contains in total (stabilizer+particles) 80% methyl acrylate and 20% isobornyl methacrylate.

(37) The dispersion is stable after storage for 7 days at room temperature (25° C.).

II. EXAMPLES OF COMPOSITIONS FOR FIBERS

(38) The following compositions 1 to 6 in accordance with the invention were prepared as described below, in order to be employed in a process in accordance with the invention in order to elongate and/or densify fibers.

(39) The components are mixed, then dispersed under hot conditions at a temperature of 80-85° C., with Rayneri stirring for 1 hour.

(40) TABLE-US-00001 (Methyl acrylate)-co- Styrene/ethylene- (isobornyl acrylate) propylene diblock Hydrogenated (80.7/19.3) copolymer copolymer (37/63) styrene/methylstyrene/indene dissolved in isododecane (Kraton G1701 EU copolymer (Regalite R1100 Isododecane (Oily dispersion SQR 1111 sold by CH Hydrocarbon Resin sold (Isododecane sold according to example 1) Kraton Polymer) by Eastman Chemical) by Ineos) Formula 1 according to the invention 48% 0%  8% 44% Formula 2 according to the invention  8% 2% 24% 66% Formula 3 according to the invention 68% 3% 28%  1% Formula 4 according to the invention 16% 6% 32% 46% Formula 5 according to the invention  8% 7% 52% 33% Formula 6 according to the invention  8% 16%   8% 68%

(41) Measurements Performed and Results

(42) Method for Evaluation Adhesion During Drying:

(43) The adhesion during drying is evaluated at 20° C. by means of the texture analyzer sold under the name TA-TX2i by the company Rheo.

(44) A 30 μl drop of formulation, when pipettable, is deposited on a contrast card (Byko). A flat steel bead then comes into contact with the drop at an approach speed of 5 mm.Math.s.sup.−1 and a force of 1 N for a contact time of 5 seconds. The bead is then retracted at the same speed of 5 mm.Math.s.sup.−1. This operation is repeated 50 times.

(45) The adhesion is considered to be sufficiently high when the value is greater than 2.5 N.

(46) Viscosity Measurement

(47) The viscosity of the compositions was measured qualitatively. Thus, it was determined qualitatively whether the composition tested is liquid, viscous or very viscous.

(48) Thus, the consistency of the compositions tested was observed by means of a pipette at room temperature.

(49) TABLE-US-00002 Viscosity Qualitative Adhesion during Measurements measurement drying Formulation 1 Liquid 2.91 Formulation 2 Liquid 2.6 Formulation 3 Viscous 2.88 Formulation 4 Very viscous 2.6 Formulation 5 Very viscous 2.9 Formulation 6 Very viscous 2.8

(50) The compositions according to the invention range from liquid to very viscous, and can therefore be applied to the skin and the fibers.

(51) The measurements of adhesion during drying are very good. They are all greater than 2.5.

(52) Thus, the compositions may be used advantageously in a process according to the invention making it possible to elongate and/or densify the fibers.