Wax dispersions
View Patent ↗The disclosed invention provides wax dispersions with an average particle size of 0.5 to 100 μm containing (a) a wax phase with a melting point above 25° C. which contains at least one oil or wax component selected from dialkyl(ene) ethers, dialkyl(ene) carbonates, dicarboxylic acids, hydroxyfatty alcohols, and mixtures thereof and at least one emulsifier, and (b) a water phase. The wax dispersions are particularly useful as a basis for cosmetic preparations and, more particularly, for impregnating and wetting utility and sanitary wipes used for personal hygiene and body care.
1. A wax dispersion having a particle size distribution such that 50% of the dispersed wax is <10 micrometers (μm), comprising:
(a) 10% to 75% by weight, based on the dispersion, of a wax phase with a melting point in the range of from above 25° C. to about 50° C., which comprises at least one oil or wax component selected from the group consisting of dialkyl(ene) carbonates, dicarboxylic acids, hydroxyfatty alcohols, and
mixtures thereof, and at least one emulsifier; and
(b) a water phase.
2. The wax dispersion according to claim 1 , wherein the at least one emulsifier of the wax phase is selected from the group of nonionic emulsifiers.
3. The wax dispersion according to claim 1 , wherein the average particle size is 5 to 50 μm.
4. The wax dispersion according to claim 1 , wherein the wax phase comprises less than 3% by weight of water, based on the total weight of the wax phase.
5. The wax dispersion according to claim 1 , wherein the wax phase contains at least one further component selected form the group consisting of an other wax-like lipid component and an other oil component.
6. The wax dispersion according to claim 5 , wherein the other wax-like lipid component is selected from the group consisting of C 12-24 fatty alcohols, mono-, di- or triesters of glycerol, C 12-24 fatty acids, mono- or diesters of ethylene glycol, C 12-24 fatty acids, and mixtures thereof.
7. The wax dispersion according to claim 1 , further comprising at least one polymer.
8. The wax dispersion according to claim 7 , wherein the polymer is selected from the group consisting of polyacrylates, polysaccharides, polyacrylamides, and mixtures thereof.
9. The wax dispersion according to claim 1 , wherein the wax phase further comprises at least one active component.
10. The wax dispersion according to claim 1 , further comprising at least one humectant.
11. A body care preparation comprising a wax dispersion according to claim 1 .
12. A wax dispersion having a particle size distribution such that 50% of the dispersed wax is <10 micrometers (μm) comprising:
(a) 10-25% by weight, based on the wax dispersion, of a wax phase with a melting point in the range of about 35 to about 50° C. which comprises:
(1) at least one oil or wax component selected from C 14-30 dialkyl(ene) carbonates, C 9-34 dicarboxylic acids or C 12-30 hydroxyfatty alcohols, and mixtures thereof,
(2) at least one other oil,
(3) at least one nonionic emulsifier, and
(4) at least one other wax-like lipid component; and
(b) 75-90% by weight, based on the wax dispersion, of a water phase.
13. The wax dispersion according to claim 12 , further comprising 0.01 to 5.0% by weight of at least one polymer, based on the overall wax dispersion.
14. The wax dispersion according to claim 13 , wherein the polymer is selected from the group consisting of polyacrylates, polysaccharides, polyacrylamides, and mixtures thereof.
15. The wax dispersion according to claim 12 , wherein the average particle size is 5 to 50 μm.
16. The wax dispersion according to claim 12 , wherein the wax phase comprises less than 3% by weight, based on the weight of the wax phase, of water.
17. The wax dispersion according to claim 12 , wherein the wax phase further comprises at least one active component.
18. The wax dispersion according to claim 12 , further comprising at least one humectant.
19. A body care preparation comprising a wax dispersion according to claim 12 .
20. A process for the production of a wax dispersion having a particle size distribution such that 50% of the dispersed wax is <10 micrometers (μm), and having (a) 10-75% by weight, based on the wax dispersion, of a wax phase with a melting point in the range of about 35 to about 50° C., which comprises at least one oil or wax component selected from the group consisting of dialkyl(ene) carbonates, dicarboxylic acids, hydroxyfatty alcohols, and mixtures thereof and at least one emulsifier; and (b) a water phase, said process comprising:
(1) providing a preliminary emulsion of the wax phase containing a water phase and having a temperature above the melting range of the waxes, and
(2) introducing said preliminary emulsion, under pressure, into a polymer-containing water phase which has a temperature in the range of about 1 to 30° C.
21. The process according to claim 20 , further comprising homogenizing the preliminary emulsion at least once before introducing it into the water phase of step (2).
22. The process according to claim 20 , further comprising cooling the preliminary emulsion in a heat exchanger before introducing it into the water phase of step (2).
23. The process according to claim 20 , wherein the preliminary emulsion also contains a polymer.
24. The process according to claim 23 , wherein the polymer is selected from the group consisting of polyacrylates, polysaccharides, polyacrylamides, and mixtures thereof.
25. The process according to claim 20 , wherein the preliminary emulsion is introduced into the water phase of step (B) by spraying under pressure through a nozzle.