Compositions containing quaternary ammonium compounds
This invention relates to compositions containing quaternary ammonium compounds in which the nitrogen atom is substituted by at least one alkyl group having at least 12 carbon atoms, characterized in that said composition includes at least 20% in weight by weight of the total composition, of ammonium halides in which the nitrogen atom is substituted by at least one alkyl group having at least 14 carbon atoms and more than 5%, preferably more than 7% in weight by weight of the total composition, of ammonium halides in which the nitrogen atom is substituted by at least one alkyl group having at least 16 carbon atoms. This invention also relates to ophthalmic oil-in-water emulsions containing such compositions, said ophthalmic emulsions being useful for eye care or for the treatment of eye conditions.
1. A composition comprising
a) at least 20% in weight by weight of the total composition, of quaternary ammonium halides in which the nitrogen atom is substituted by one alkyl group of 14 carbon atoms and
b) more than 5% in weight by weight of the total composition, of quaternary ammonium halides in which the nitrogen atom is substituted by one alkyl group of 16 carbon atoms,
wherein the composition is ophthalmic, the composition does not include quaternary ammonium halides in which the nitrogen atom is substituted by 12 carbon alkyl chains, and a zeta potential of the composition increases with increasing alkyl group length.
2. The composition according to claim 1 , wherein said composition includes
a) at least 20% in weight by weight of the total composition, of quaternary ammonium halides in which the nitrogen atom is substituted by one alkyl group of 14 carbon atoms and
b) at least 10% in weight by weight of the total composition, of quaternary ammonium halides in which the nitrogen atom is substituted by one alkyl group of 16 carbon atoms.
3. The composition according to claim 1 , wherein said quaternary ammonium halides are benzyl dimethyl ammonium chlorides or bromides.
4. The composition according to claim 1 , comprising C14- and C16-alkyl benzyl dimethyl ammonium chloride.
5. The composition according to claim 1 , wherein said quaternary ammonium halide is a trimethyl ammonium chloride or bromide.
6. The composition according to claim 1 , wherein the amount of ammonium halides in which the nitrogen atom substituted by at least one alkyl group of 14 or 16 carbon atoms represents at least 50% w/w in dry weight of the weight of all ammonium halides present in the composition.
7. An oil-in-water emulsion comprising a composition comprising
a) at least 20% in weight by weight of the total composition, of quaternary ammonium halides in which the nitrogen atom is substituted by one alkyl group of 14 carbon atoms and
b) more than 5% in weight by weight of the total composition, of quaternary ammonium halides in which the nitrogen atom is substituted by one alkyl group of 16 carbon atoms,
said emulsion comprising 0.0005 to 0.1% of quaternary ammonium halides, and said emulsion being free of quaternary ammonium halides having 12 carbon alkyl chains.
8. The oil-in-water emulsion according to claim 7 , further comprising hydroxypropyl guar, polyethylene glycol-400 or a mixture of both.
9. The oil-in-water emulsion according to claim 7 , further comprising an oil phase comprising MCT, castor oil or mineral oil, surfactants selected from the group consisting of tyloxapol, poloxamer, tocopherol polyethyleneglycol succinate and polysorbate, and optionally antioxidants and/or isotonicity agents selected from the group consisting of glycerol and mannitol.
10. The oil-in-water emulsion according to claim 7 , said emulsion having a positive zeta potential.
11. The oil-in-water emulsion according to claim 7 , said emulsion having a droplet size of 100 to 500 nm.
12. The oil-in-water emulsion according to claim 7 , said emulsion being preserved.
13. The oil-in-water emulsion according to claim 7 , said emulsion being unpreserved.
14. The oil-in-water emulsion according to claim 7 , further comprising an active principle.
15. A cosmetic composition comprising the oil-in-water emulsion according to claim 7 .
16. A non-therapeutical process for caring for, removing makeup from and/or cleansing the skin, the lips and/or the eyes, and/or for hair care, comprising applying an oil-in-water emulsion according to claim 7 to the skin, the lips, the eyes, and/or the hair.
17. The emulsion according to claim 14 , wherein said active principle is selected from the group consisting of latanoprost and cyclosporine.