Cold-preparable, low-viscosity and prolonged-stability cosmetic emulsions

Abstract

PEG-free, cold-preparable, prolonged-stability, low-viscosity, fine oil-in-water emulsions, their preparation from preferably clear oil phases or via preferably clear to transparent microemulsion-like concentrates, the corresponding oil phases or microemulsion-like concentrates and the use of the inventive emulsions for producing cosmetic, dermatological, pharmaceutical or industrial formulations, especially for the production of impregnating emulsions for wet wipes or for sprayable care emulsions are provided.

Description

Claims

1. A prolonged-stability, low-viscosity, fine oil-in-water emulsion comprising: A) an emulsifier mixture consisting of: a) at least one nonionic primary emulsifier, andb) at least one secondary emulsifier containing one or more acid functions;B) one or more cosurfactants; andC) one or more oils,

2. The oil-in-water emulsion as claimed in claim 1, wherein said water phase content is ≧80-≦99% by weight.

3. The oil-in-water emulsion as claimed in claim 1, wherein said emulsifier mixture (A), cosurfactants (B) and oils (C) are present in proportions by weight of ≧10-≦30 (A), ≧3-≦20 (B) and ≧50-≦87 (C).

4. The oil-in-water emulsion as claimed in claim 1, wherein the emulsifier mixture (A) is composed of ≧75-≦99.5% by weight of nonionic primary emulsifier component (a) and ≧0.5-≦25% by weight of emulsifier component (b).

5. The oil-in-water emulsion as claimed in claim 1, wherein the nonionic primary emulsifier component (a) in the emulsifier mixture (A) comprises one or more emulsifiers selected from the group consisting of: a1) glyceryl and polyglyceryl partial esters,a2) sorbitan or sorbitol partial esters,a3) carbohydrate esters,a4) (alkylpoly)glycosides,and mixtures thereof.

6. The oil-in-water emulsion as claimed in claim 1, wherein the nonionic primary emulsifier component (a) consists of a mixture of ≧25-≦100% by weight of polyglyceryl partial esters and ≧0-≦75% by weight of sorbitan esters which contain, as hydrophobic moieties, fatty acid radicals having a chain length of from ≧10 to ≦18 carbon atoms.

7. The oil-in-water emulsion as claimed in claim 1, wherein the nonionic primary emulsifier component (a) consists of polyglyceryl laurates or mixtures of polyglyceryl laurates with sorbitan laurates.

8. The oil-in-water emulsion as claimed in claim 1, wherein the emulsifier component (b) containing one or more acid functions comprises one or more emulsifiers which are selected from the group consisting of: b 1) optionally hydroxyl-containing di- or polycarboxylates, sulfated, sulfonated or phosphated carboxylates, malonates, malates, succinates, sulfosuccinates, citrates, tartrates, in each of which some of the acid groups have been esterified with aliphatic or aromatic, linear or branched, optionally unsaturated and/or hydroxy-functionalized alcohols having a chain length of from ≧6 to ≦22 carbon atoms,b2) optionally hydroxyl-containing di- or polycarboxylates, sulfated or sulfonated or phosphated carboxylates, malonates, malates, succinates, sulfosuccinates, citrates, tartrates, in each of which some of the acid groups have been esterified with polyols, polyol partial esters,b3) polyols, which have been partly esterified with aliphatic or aromatic, linear or branched, optionally unsaturated and/or hydroxy-functionalized mono-, di- or polycarboxylic acids having a chain length of from ≧2 to ≦22 carbon atoms, with the proviso that free, neutralizable acid groups are present in the molecule,b4) hydroxy-functional mono-, di- or polycarboxylic acids, at least some of whose hydroxyl groups have been reacted with aliphatic, linear or branched, optionally unsaturated and/or hydroxy-functionalized carboxylic acids having a chain length of from ≧6 to ≦22 carbon atoms,b5) N-acyl amino acids containing an aliphatic or aromatic, linear or branched, optionally unsaturated and/or hydroxy-functionalized radical having a chain length of from ≧6 to ≦22 carbon atoms,b6) carboxylates, sulfates, sulfonates, phosphonates or phosphates, containing an aliphatic or aromatic, linear or branched, optionally unsaturated and/or hydroxy-functionalized radical having a chain length of from ≧6 to ≦22 carbon atoms,and mixtures thereof.

9. The oil-in-water emulsion as claimed in claim 1, wherein the secondary emulsifier component b) used comprises partly neutralized or neutralized citric acid partial esters whose hydrophobic radicals each contain from ≧10 to ≦18 carbon atoms.

10. The oil-in-water emulsion as claimed in claim 1, wherein said at least one cosurfactant (B) is selected from the group consisting of n-pentanol, n-hexanol, 1,2-hexanediol, 1,2-heptanediol and 1,2-octanediol.

11. The oil-in-water emulsion as claimed in claim 1, wherein said at least one cosurfactant (B) is aromatic.

12. The oil-in-water emulsion as claimed in claim 11, wherein the aromatic cosurfactants (B) include phenoxyethanol, benzyl alcohol, alkylparaben esters alone or in mixtures with one another and/or customary preservatives.

13. The oil-in-water emulsion as claimed in claim 1, wherein the oils (C) are cosmetic ester or ether oils.

14. The oil-in-water emulsion as claimed in claim 1, wherein the oils (C) are at least one compound selected from the group consisting of ethylhexyl palmitate, ethylhexyl stearate, decyl cocoate, diethylhexyl carbonate, dioctyl carbonate, cetearyl ethylhexanoate, decyl oleate, isocetyl palmitate, cetearyl isononanoate, hexyl laurate, isopropyl isononanoate, isopropyl stearate, isopropyl palmitate, isopropyl myristate, isopropyl laurate, C12-15 alkyl benzoate, dicaprylyl ether, mineral oil, isohexadecane, cyclopentasiloxane, octyldodecanol and mixtures of these compounds.

15. An oil phase comprising: A) an emulsifier mixture consisting of: a) at least one nonionic primary emulsifier, andb) at least one secondary emulsifier containing one or more acid functions;B) one or more cosurfactants;C) one or more oils; andD) from ≧0 to <10% by weight, based on the overall oil phase, of one or more polar solubilizers.

16. The oil phase as claimed in claim 15, which is homogeneous and clear.

17. A process for preparing oil-in-water emulsions, which comprises adjusting an oil phase as claimed in claim 15 to a total water phase content of ≧70% by weight with an appropriate water phase.

18. A clear to transparent microemulsion-like concentrate comprising: A) an emulsifier mixture consisting of: a) at least one nonionic primary emulsifier, andb) at least one secondary emulsifier containing one or more acid functions;B) one or more cosurfactants; andC) one or more oils, with the proviso that the total water phase content of the microemulsion-like concentrates is from ≧10 to <70% by weight, based on the overall concentrate.

19. A process for preparing oil-in-water emulsions, which comprises adjusting clear to transparent microemulsion-like concentrates as claimed in claim 18 to a total water phase content of ≧70% by weight with an appropriate water phase.

20. A formulation comprising an oil-in-water emulsion as claimed in claim 1.

21. Impregnated wipes or in sprayable formulations for face- and bodycare, babycare, sun protection, makeup removers, antiperspirants/deodorants comprising the oil-in-water emulsion of claim 1.