STABLE DISPERSIONS COMPRISING DROPS OF A PERFUMING AGENT

Abstract

The present invention relates to the use of at least one cross-linked polymer or a cross-linked copolymer, the polymer or copolymer comprising at least one unit derived from the polymerization of one of the monomers selected from the group consisting of acrylic acid, methacrylic acid, alkyl acrylate comprising from 1 to 30 carbon atoms and salts thereof, for stabilizing at least one perfuming agent in a composition comprising at least 3% by weight of perfuming agent(s), the perfuming agent being in the form of dispersed drops in an aqueous gel, the aqueous gel comprising water, a buffer having a pKa comprised from 4.0 to 9.0 and a base, and the size of the perfuming agent drops ranging from 0.2 μm to 5,000 μm.

Claims

1. A method for stabilizing at least one perfuming agent in a dispersion comprising at least 3% by weight of perfuming agent(s), the perfuming agent(s) being in the form of drops dispersed in an aqueous gel, said method comprising the addition of at least one cross-linked polymer or cross-linked copolymer into the dispersion, said polymer or copolymer comprising at least one unit derived from the polymerization of one of the monomers selected from the group consisting of acrylic acid, methacrylic acid, alkyl acrylate comprising from 1 to 30 carbon atoms and salts thereof, said aqueous gel comprising water, a buffer having a pKa comprised from 4.0 to 9.0 and a base and further preferably at least one carbomer different from said cross-linked polymer or cross-linked copolymer, and the size of the perfuming agent drops ranging from 0.2 μm to 5,000 μm.

2. A dispersion containing a dispersed phase comprising drops and a continuous aqueous phase as a gel, wherein: the drops comprise at least one perfuming agent and a shell, said shell comprising at least one carbomer and/or a cross-linked copolymer acrylates/C10-30 alkyl acrylate; the continuous aqueous phase comprises water, a buffer having a pKa comprised between 4.0 to 9.0, a base and at least one cross-linked polymer or cross-linked copolymer different from said carbomer and/or a cross-linked copolymer acrylates/C10-30 alkyl acrylate, said cross-linked polymer or cross-linked copolymer comprising at least one unit derived from the polymerization of one of the monomers selected from the group consisting of acrylic acid, methacrylic acid, alkyl acrylate comprising from 1 to 30 carbon atoms and salts thereof.

3. The dispersion according to claim 2, comprising from 0.1% to 10% by weight of cross-linked polymer(s) or cross-linked copolymer(s) based on the total weight of said dispersion.

4. The dispersion according to claim 2, wherein the cross-linked copolymer is selected from among the cross-linked copolymers of acrylic or methacrylic acid and of alkyl acrylates comprising from 1 to 4 carbon atoms.

5. The dispersion according to claim 2, comprising at least 3% by weight, of perfuming agent(s) based on the total weight of said dispersion.

6. The dispersion according to claim 2, wherein the drops further comprise at least one cationic polymer.

7. The dispersion according to claim 6, wherein the cationic polymer is a silicone polymer modified with a primary, secondary or tertiary amine function.

8. The dispersion according to claim 6, wherein the cationic polymer fits the following formula (I): ##STR00005## wherein: R.sub.1, R.sub.2 and R.sub.3, independent of each other, represent OH or CH.sub.3; R.sub.4 represents a group —CH.sub.2— or a group —X—NH— wherein X is a divalent C3 or C4 alkylene radical; x is an integer comprised between 10 and 5,000; y is an integer comprised between 2 and 1,000; and z is an integer comprised between 0 and 10.

9. The dispersion according to claim 6, wherein each drop comprises from 0.01% to 10% by weight of cationic polymer(s), based on the total weight of the drop.

10. The dispersion according to claim 2, wherein the average diameter of the drops of the dispersed phase is comprised from 0.2 μm to 3,000 μm.

11. The dispersion according to claim 2, comprising from 0.05% to 5% by weight of carbomer(s) and/or cross-linked copolymer(s) acrylates/C10-30 alkyl acrylate based on the total weight of said dispersion.

12. The dispersion according to claim 2, wherein the buffer is selected from the group consisting of phosphate buffers, of 2-(N-morpholino)ethane sulfonic acid, of 2-amino-2-hydroxymethyl-1,3-propanediol, of 2-(bis(2-hydroxyethyl)amino)acetic acid, of 4-(2-hydroxyethyl)-1-piperazine ethane sulfonic acid, of sodium citrate and mixtures thereof.

13. The dispersion according to claim 2, comprising from 0.1% to 10% by weight of buffer(s), based on the total weight of said dispersion.

14. The dispersion according to claim 2, wherein the base is NaOH.

15. The cosmetic composition comprising a dispersion according to claim 2, associated with a physiologically acceptable medium.

16. A non-therapeutic method for cosmetic treatment of the skin comprising a step for applying on a keratinous material, of at least one layer of a dispersion according to claim 2.

17. A non-therapeutic method for cosmetic treatment of the skin comprising a step for applying on a keratinous material of a cosmetic composition according to claim 15.

Description

EXAMPLES

[0312] Raw Materials

TABLE-US-00001 Name INCI name Provider Carbomer 340FD Carbomer (carbomer) Evonik Carbopol ® 981 Carbomer (carbomer) Lubrizol Fixate Superhold Polyacrylate-2 Crosspolymer Lubrizol Fixate Freestyle Acrylate crosspolymer-3 Lubrizol Polymer Carbopol ® Aqua SF1 Acrylate copolymer Lubrizol Carbopol ® Aqua SF2 Acrylate crosspolymer-4 Lubrizol KF8004 Amodimethicone Shin-Etsu Soda Sodium hydroxide Panreac Microcare ® PE Phenoxyethanol Thor Microcare ® Emollient Pentylene glycol Thor PTG Edeta ® BD Disodium EDTA BASF Hepes-Luv Hydroxyethylpiperazine Ethane Hopax Sulfonic Acid Hydro (HEPES) Perfume Fragrance Givaudan DUB ININ Isononyl Isononanoate Stéarinerie Dubois Water Aqua —

[0313] The perfume used comprises 4% by weight of linear and/or branched alcohols linéaires and 96% by weight of other perfume ingredients (and therefore 0% by weight of aldehydes and 0% by weight of ingredients with C log P<2.1).

Example 1: Preparation of a Perfume Dispersion without Coacervation

[0314] This example consisted in preparing a gel suspending perfume droplets without stabilization of the latter by a coacervate membrane.

[0315] The composition of Example 1 consists of the following ingredients (cf. table below):

TABLE-US-00002 Name INCI name % w/w Osmosed water Aqua 83.68%  Perfume Fragrance   10% Crosspolymer Acrylate crosspolymer-4 2.70% Carbopol Aqua SF2 Microcare ® PE Phenoxyethanol 0.72% Microcare ® emollient Pentylene glycol 1.80% PTG Hepes Hydroxyethylpiperazine 0.90% Ethane Sulfonic Acid Hydro Edeta ® BD Disodium EDTA 0.01% NaOH Sodium Hydroxide 0.19% Total 100.00% 

[0316] The composition of Example 1 is prepared according to the following procedure:

[0317] The final half-water mixture is mixed with the preservatives. Stirring is performed by means of a de-flocculating type blade for 15 min at 300 rpm.

[0318] The Crosspolymer is added while maintaining mild stirring.

[0319] A solution is prepared separately with Hepes, the soda and the remainder of water which will be added slowly to the previous solution still with stirring.

[0320] Finally, the perfume is slowly incorporated and stirring is continued until total dispersion.

TABLE-US-00003 Time (in days) 0 7 14 21 28 pH 7.17 7.1 6.78 6.74 6.45 Viscosity 1,576 1,620 1,712 1,660 1,308 (mPa .Math. s)

[0321] The viscosity is measured according to the method indicated above in the description.

[0322] This composition proves to be advantageously stable for at least one month at 50° C. Even if the pH was lowered, the viscosity of the gel remained stable over time and at 50° C.

[0323] This example therefore gives the possibility of showing that the use of a cross-linked copolymer or of a cross-linked polymer according to the invention advantageously gives the possibility of stabilizing the compositions comprising a high amount of perfume.

Example 2: Preparation of a Perfuming Composition

[0324] The perfuming composition of Example 2 (perfume serum) is a pumpable perfumed product which is stable over time.

[0325] The composition of Example 2 consists of the following ingredients (cf. table below):

TABLE-US-00004 % by weight based on the total weight of Name INCI name the composition Osmosed water Aqua 83.72% Phase A Isononyl 10.45% 1.05% Isononanoate Perfume 89.10% 8.91% Amodimethicone 0.45% 0.05% Total 100.00% Carbomer Carbomer 0.18% Carbopol 981 from Lubrizol Crosspolymer Acrylate crosspolymer-4 1.80% Microcare ® PE Phenoxyethanol 0.90% Microcare ® emollient Pentylene glycol 2.25% PTG Hepes Hydroxyethylpiperazine 0.90% Ethane Sulfonic Acid Hydro Edeta ® BD Disodium EDTA 0.01% NaOH Sodium Hydroxide 0.23% Total 100.00%

[0326] The composition of Example 2 is prepared according to the following procedure:

[0327] Half of the water and the preservatives are mixed. Stirring is performed by means of a de-flocculating type blade for 15 min at 300 rpm.

[0328] The stirring is stopped for incorporating the carbomer, one waits for 1h for the hydration of the latter in order to next stir by means of a de-flocculator rapidly but without incorporating any air bubbles for 2h.

[0329] The crosspolymer is added and is stirred until complete dispersion.

[0330] A solution with the Hepes, the soda and the remainder of water which has just been slowly added to the preceding solution always with stirring is prepared separately.

[0331] Finally, the phase A is prepared by mixing isononyl isononanoate, amodimethicone and perfume. This phase A is then incorporated to the aqueous phase with moderate stirring.

[0332] Alternatively, the solution with Hepes, the soda and the remainder of water may be added after dispersion of the phase A into the carbomer solution.

[0333] The final composition of the perfuming composition of Example 2 is the following:

TABLE-US-00005 Flow rate Fluid Composition (g/min) % w/w IF 99.50% Perfume 3.97 9.48% 0.5% Amodimethicone MF 100% DUB ININ 0.4 0.96% OF 0.25% Carbomer 30 71.65% 1% Microcare ® PE 2.5% Microcare ® PTG 0.01% Edeta ® QSP 100% deionized water Crosspolymer 13.39% Acrylates crosspolymer-4 5.6 13.37% 0.019% NaOH QSP 100% deionized water Base 4.81% NaOH 1.9 4.54% 19.77% Hepes QSP 10% deionized water

[0334] The stability of this composition was studied at 50° C. for several days. The results in terms of pH and of viscosity are provided in the following table:

TABLE-US-00006 Time (in days) 0 7 14 21 27 pH 7.4 7.18 6.92 6.76 6.67 Viscosity 2,450 2,580 2,760 2,470 2,360 (mPa .Math. s)

[0335] The viscosity is measured according to the method described in Example 1.

[0336] This composition prove to be advantageously stable for at least one month at 50° C. Indeed, the viscosity and the pH did not vary much over time and at 50° C. Consequently, the gel is not very acidified and has retained its suspensive properties.

[0337] Furthermore, the composition according to Example 2 has an olfactory profile similar to the one of a conventional perfuming composition, i.e. hydroalcoholic and comprising an identical perfume content.

Example 3: Preparation of a Perfuming Composition

[0338] The perfuming composition of Example 3 (perfume serum) is a perfumed product (which may be powdered) which is stable over time.

[0339] The composition of Example 3 consist of the following ingredients (cf. table below):

TABLE-US-00007 % by weight based on the total weight of Name INCI name the composition Osmosed water Aqua 86.21%  Phase A Isononyl 16.12% 1.47% Isononanoate Perfume 83.41% 7.28% Amodimethicone 0.46% 0.04% Total 100.00% Carbomer Carbomer 0.14% Crosspolymer Acrylates crosspolymer-4 1.38% Microcare ® PE Phenoxyethanol 0.74% Microcare ® emollient Pentylene glycol 1.84% PTG Hepes Hydroxyethylpiperazine  0.7% Ethane Sulfonic Acid Hydro Edeta ® BD Disodium EDTA 0.01% NaOH Sodium Hydroxide 0.14% Total 100.00% 

[0340] The composition of Example 3 is prepared according to the procedure of Example 2.

[0341] The final composition of the perfuming composition of Example 3 is the following:

TABLE-US-00008 Flow rate Fluid Composition (g/min) % w/w IF 90% Perfume 14.82  7.96% 0.5% Amodimethicone 9.5% DUB ININ MF 100% DUB ININ 1.28  0.7% OF 0.19% Carbomer 135 72.05% 1% Microcare ® PE 2.5% Microcare ® PTG 0.01% Edeta ® 0.005% NaOH QSP 100% deionized water Crosspolymer 10.04% Carbopol ® Aqua SF2 25.22 13.55% 0.0194% NaOH QSP 100% deionized water Base 3.70% NaOH 7  3.76% 19.77% Hepes QSP 100% deionized water

[0342] The stability of the composition of Example 3 was studied at 50° C. for several days. The results in terms of pH and viscosity are provided in the following table:

TABLE-US-00009 Time (in days) 0 7 14 21 28 pH 7.36 7.11 7.24 7.04 7.02 Viscosity 1,180 1,236 1,492 1,188 1,196 (mPa .Math. s)

[0343] This composition proves to be advantageously stable for at least one month at 50° C. Indeed, the viscosity and the pH did not vary much over time and at 50° C. Consequently, the gel is not very acidified and retained its suspensive properties.

[0344] Furthermore, the composition according to Example 3 has an olfactory profile similar to that of a conventional perfuming composition, i.e. hydroalcoholic and comprising an identical perfume content.

Example 4: Comparative Example

[0345] This example consisted in preparing two compositions which differ at the aqueous gel level suspending the droplets of perfume stabilized with a coacervate membrane.

[0346] The compositions of Example 4 consist of the following ingredients (the indicated percentages are expressed based on the total weight of the relevant phase):

TABLE-US-00010 Composition A Composition B (Invention) (Comparative) Phase Name INCI name % w/w % w/w Aqueous Osmosed water Aqua qsp qsp phase Carbopol 981 Carbomer  0.2%  0.2% (phase A) Crosspolymer Acrylates crosspolymer-4   2%   0% Carbopol Aqua SF2 Microcare ® PE Phenoxyethanol  0.8%  0.8% Microcare ® emollient Pentylene glycol   2%   2% PTG Hepes Hydroxyethylpiperazine   1%   1% Ethane Sulfonic Acid Hydro Edeta ® BD Disodium EDTA 0.01% 0.01% NaOH Sodium Hydroxide 0.17% 0.25% Dispersed Perfume Perfume 99.5% 99.5% phase KF8004 Amodimethicone  0.5%  0.5% (phase B) Total 100.00%  100.00% 

[0347] The final compositions comprise 90% by weight of aqueous phase A and 10% by weight of dispersed phase B as described above, based on the total weight of said composition.

[0348] The compositions of Example 4 are prepared according to the following procedure:

[0349] Phase A:

[0350] Half of the water and the preservatives are mixed. Stirring is performed by means of a de-flocculator type blade for 15 min at 300 rpm.

[0351] The carbomer is incorporated with stirring and then this stirring is maintained for 1 h in order to ensure hydration of the latter.

[0352] For the composition A, the crosspolymer is added and stirring is performed until complete dispersion.

[0353] A solution is prepared separately with Hepes, the soda and the remainder of water which has just been added slowly to the preceding solution always with stirring.

[0354] Phase B:

[0355] In parallel, the phase B is prepared by mixing the amodimethicone and the perfume. This phase B is then incorporated to the aqueous phase A with moderate stirring.

[0356] Alternatively, the solution with Hepes, the soda and the remainder of water may be added after dispersion of phase B in phase A.

[0357] The stability of the compositions of Example 4 was studied at 50° C. for several days. The results in terms of pH and of viscosity are provided in the following tables:

TABLE-US-00011 Time Loss (in days) (absolute 0 30 loss) pH Composition A 7.14 6.47 −0.67 (invention) Composition B 7.17 5.94 −1.23 (comparative)

TABLE-US-00012 Time (in days) Loss 0 30 (in %) Viscosity Composition 2,172 2,149 −1.06% (mPa .Math. s) A (invention) Composition B 1,128 648 −42.55% (comparative)

[0358] The viscosity is measured according to the method indicated above in the description.

[0359] As compared with the comparative composition B, the composition A according to the invention prove to be significantly more stable for at least one month at 50° C. Even if the pH of the composition A has decreased, the viscosity of the gel has remained stable over time and at 50° C.

[0360] This example therefore gives the possibility of showing that the use of a cross-linked copolymer or cross-linked polymer according to the invention advantageously gives the possibility of stabilizing compositions comprising a high amount of perfume.

[0361] Furthermore, the composition A according to Example 4 has an olfactory profile similar to that of a conventional perfuming composition, i.e. hydroalcoholic and comprising an identical perfume content.