COSMETIC EMULSION COMPRISING 1,2-DECANEDIOL

Abstract

The present invention relates to novel cosmetic emulsions, comprising 1,2-decanediol, advantageous uses thereof and methods for their production.

Claims

1. A cosmetic emulsion comprising: a continuous water phase; oil droplets distributed in the continuous water phase; and 1,2-decanediol; wherein the oil droplets distributed in the continuous water phase have an average volume-related diameter d.sub.v0.5 of from 1.0 to 10.0 μm. further preferably 5.0 to 10.0 μm.

2. The emulsion according to claim 1, wherein the emulsion is free of silica dimethylsilylate.

3. The emulsion according to claim 1, wherein the emulsion further comprises one or more emulsifier(s) different from 1,2-decanediol.

4. The emulsion according to claim 3, wherein the one or more emulsifier(s) different from 1,2-decanediol is/are selected from the group consisting of PEG-100 stearate, cetearyl glucoside, distearyldimonium chloride, palmitamidopropyl trimoniumchloride, glyceryl stearat citrate, glyceryloleate citrate, polyglyceryl-(3)-methylglucose distearate, cetearyl alcohol, potassium cetyl phosphate, sodium cetyl phosphate, acrylate/C.sub.10-C.sub.30-alkylacrylate-cross-polymer, ammoniumacryloyldimethyltaurate/beheneth-25 methacrylate-cross-polymer, polyglyceryl-4-caprate, polyglyceryl-4-caprylate/caprate, cetyl PEG/PPG-10/1 dimethicon, polyglyceryl-6 dioleate, polyglyceryl-2-stearate, PEG-30 dipolyhydroxystearate, sodium stearoyllactylate, PEG-40 hydrated castor oil, hydrated palmglycerides, and a mixture thereof.

5. The emulsion according to claim 4, wherein the one or more emulsifier(s) different from 1,2-decanediol is/are selected from the group consisting of cetearyl alcohol, glycerylstearat citrate, polyglyceryl-(3)-methylglucosedistearate, potassium cetyl phosphate, hydrated palmglycerides and a mixture thereof.

6. The emulsion according to claim 3, wherein the one or more emulsifier(s) different from 1,2-decanediol is/are present in the emulsion in a total amount of from 0.1 to 5.0 wt.-%, related relative to the total weight of the emulsion.

7. The emulsion according to claim 1, wherein 1,2-decanediol is present in the emulsion in an amount of up to 2.0 wt.-%, relative to the total weight of the emulsion.

8. The emulsion according to claim 7, wherein 1,2-decanediol is present in the emulsion in an amount in the range of from 0.005 to 0.1 wt.-%, relative to the total weight of the emulsion.

9. The emulsion according to claim 1, wherein the emulsion is a two-phase system of a cosmetic oil in water.

10. The emulsion according to claim 1, wherein the emulsion has less than 25 wt. % of silicon-containing oils, related relative to the total weight of the emulsion.

11. The emulsion according to claim 1 according to, wherein the oil droplets distributed in the water phase have an average volume-based diameter d.sub.v0.9 of from 1.0 to 10.0 μm, 8.0 μm, further preferably 3.0 to 5.5 μm, determined by laser diffraction spectroscopy.

12. The emulsion according to claim 1 Cosmetic emulsion according to any one of the preceding claims, wherein the oil droplets distributed in the water phase have an average volume-based diameter d.sub.v0.9 of from 1.0 to 30.0 μm, preferably 5.0 to 25.0 μm, further preferably 10.0 to 22.0 μm, even further preferably 10.0 to 16.0 μm, determined by laser diffraction spectroscopy.

13. (canceled)

14. (canceled)

15. A method for producing a cosmetic emulsion according to claim 1, comprising or consisting: a) providing an aqueous phase; b) providing an oil phase; c) combining the aqueous phase and the oil phase, wherein the aqueous phase and/or the oil phase comprises 1,2-decanediol.

16. The method according to claim 15, wherein the aqueous phase and/or the oil phase is/are heated before step c to a temperature of from 50 to 100° C.

17. The method according to claim 15, wherein the combined phases are homogenized after step c.

18. The emulsion according to claim 1, wherein the oil droplets distributed in the continuous water phase have an average volume-related diameter d.sub.v0.5 of from 3.0 to 10.0 μm, determined by laser diffraction spectroscopy.

19. The emulsion according to claim 1, wherein the oil droplets distributed in the continuous water phase have an average volume-related diameter d.sub.v0.5 of from 5.0 to 10.0 μm, determined by laser diffraction spectroscopy.

20. The emulsion according to claim 1, wherein the oil droplets distributed in the water phase have an average volume-based diameter d.sub.v0.1 of from 2.0 to 8.0 μm, determined by laser diffraction spectroscopy.

21. The emulsion according to claim 1, wherein the oil droplets distributed in the water phase have an average volume-based diameter d.sub.v0.9 of from 10.0 to 22.0 μm, determined by laser diffraction spectroscopy.

22. The emulsion according to claim 1 , wherein the oil droplets distributed in the water phase have an average volume-based diameter d.sub.v0.1 of from 3.0 to 5.5 μm, an average volume-related diameter d.sub.v0.5 of from 5.0 to 10.0 μm, and an average volume-based diameter d.sub.v0.9 of from 10.0 to 16.0 μm, determined by laser diffraction spectroscopy.

Description

[0127] FIG. 1 shows a light microscope picture of emulsion 1.

[0128] FIG. 2 shows a light microscope picture of emulsion 2.

[0129] FIG. 3 shows a light microscope picture of emulsion 3.

[0130] FIG. 4 shows a light microscope picture of emulsion 4.

[0131] FIG. 5 shows a light microscope picture of emulsion 5.

[0132] FIG. 6 shows a light microscope picture of emulsion 6.

[0133] FIG. 7 shows a light microscope picture of emulsion 7.

[0134] FIG. 8 shows a light microscope picture of emulsion 8.

[0135] FIG. 9 shows a light microscope picture of emulsion 9.

[0136] FIG. 10 shows a light microscope picture of emulsion 10.

[0137] FIG. 11 shows a light microscope picture of emulsion 11.

TABLE-US-00006 TABLE 6 Emulsion d.sub.v0,1 [μm] d.sub.v0,5 [μm] d.sub.v0,9 [μm]  1* 5.14 9.15 15.95  2  3.79 7.30 13.25  3  4.18 7.22 12.10  4  4.33 7.61 13.90  5* 5.67 10.05 16.65  6  5.35 9.59 15.90  7  4.21 7.58 12.85  8  4.56 8.02 13.60  9* 4.74 9.59 18.10 10  3.86 8.35 — 11  3.21 5.86 10.45 *comparative example

[0138] As shown in Table 6, the emulsions according to the invention (i.e. containing 1,2-decanediol) have a smaller oil droplet size and thus a higher (physical) stability than the comparative emulsions (emulsions 1, 5, 9).

[0139] Particularly, Table 6 and FIGS. 1 to 11 show that the presence of only 0.1 wt.-% or, respectively 0.05 wt.-% 1,2-decanediol allow to significantly (more than 30%) reduce the total amount of emulsifier without reducing the (physical) stability of the emulsion. This is particularly shown by a comparison of emulsions 3, 4 and 1*, of emulsions 7,8 and 5* as well as emulsions 11 and 9*. It was particularly surprisingly found that the emulsions containing 1,2-decanediol even showed a higher stability (i.e. lower oil droplet size) than the comparative emulsions despite the reduced total amount of emulsifier.