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 oil-in-water emulsion comprising: (a) a continuous water phase; (b) oil droplets distributed in the continuous water phase having an average volume-related diameter d.sub.v0.5 of 1.0 to 10.0 μm, determined by laser diffraction spectroscopy; (c) 0.005 to 0.1 wt.-% of 1,2-decanediol; and (d) 0.1 to 5.0 wt.-% of an emulsifier other than the 1,2-decanediol; wherein all percentages by weight are based on a total weight of the emulsion.

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

3. The emulsion according to claim 1, wherein the one or more emulsifier(s) different from the 1,2-decanediol is/are selected from 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.

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

5. The emulsion according to claim 1, wherein the emulsion is a two-phase system.

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

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

8. The emulsion according to claim 1, wherein the oil droplets distributed in the water phase have an average volume-based diameter d.sub.v 0.9 of 1.0 to 30.0 μm, determined by laser diffraction spectroscopy.

9. A method for producing a cosmetic emulsion according to claim 1, comprising: 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.

10. The method according to claim 9, wherein the aqueous phase and/or the oil phase is/are heated before c) to a temperature of 50 to 100° C.

11. The method according to claim 9, wherein the combined phases are homogenized after c).

12. 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 3.0 to 10.0 μm, determined by laser diffraction spectroscopy.

13. 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 5.0 to 10.0 μm, determined by laser diffraction spectroscopy.

14. 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 2.0 to 8.0 μm, determined by laser diffraction spectroscopy.

15. 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 10.0 to 22.0 μm, determined by laser diffraction spectroscopy.

16. 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 3.0 to 5.5 μm, an average volume-related diameter d.sub.v0.5 of 5.0 to 10.0 μm, and an average volume-based diameter d.sub.v0.9 of 10.0 to 16.0 μm, determined by laser diffraction spectroscopy.

Description

(1) FIG. 1 shows a light microscope picture of emulsion 1.

(2) FIG. 2 shows a light microscope picture of emulsion 2.

(3) FIG. 3 shows a light microscope picture of emulsion 3.

(4) FIG. 4 shows a light microscope picture of emulsion 4.

(5) FIG. 5 shows a light microscope picture of emulsion 5.

(6) FIG. 6 shows a light microscope picture of emulsion 6.

(7) FIG. 7 shows a light microscope picture of emulsion 7.

(8) FIG. 8 shows a light microscope picture of emulsion 8.

(9) FIG. 9 shows a light microscope picture of emulsion 9.

(10) FIG. 10 shows a light microscope picture of emulsion 10.

(11) FIG. 11 shows a light microscope picture of emulsion 11.

(12) 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

(13) 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).

(14) 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.