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The present invention relates to topical compositions in the form of an oil-in-water (O/W) emulsion comprising an oil phase dispersed in an aqueous phase in the presence of a polyglyceryl fatty ester surfactant, characterized in that the topical composition further comprises a phosphate ester co-sur

The present invention relates to topical compositions in the form of an oil-in-water (O/W) emulsion comprising an oil phase dispersed in an aqueous phase in the presence of a polyglyceryl fatty ester surfactant, characterized in that the topical composition further comprises a phosphate ester co-surfactant. Furthermore, the invention relates to the use of a phosphate ester surfactant to reduce the viscosity of a topical composition in the form of an O/W emulsion comprising an oil phase dispersed in an aqueous phase in the presence of a polyglyceryl fatty ester surfactant.

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1. Topical composition in the form of an oil-in-water (O/W) emulsion comprising an oil phase dispersed in an aqueous phase in the presence of a polyglyceryl fatty ester surfactant, wherein the topical composition further comprises a phosphate ester co-surfactant. 2. The topical composition according

1. Topical composition in the form of an oil-in-water (O/W) emulsion comprising an oil phase dispersed in an aqueous phase in the presence of a polyglyceryl fatty ester surfactant, wherein the topical composition further comprises a phosphate ester co-surfactant. 2. The topical composition according to claim 1, wherein the amount of the polyglyceryl fatty ester surfactant is selected in the range of 0.1 to 10 wt.-%, preferably in the range of 0.3 to 5 wt. %, most preferably in the range of 0.5 to 3 wt.-% based on the total weight of the topical composition. 3. The topical composition according to claim 1, wherein the amount of the phosphate ester co-surfactant is selected in the range of 0.01 to 3 wt.-%, preferably in the range of 0.05 to 2 wt.-%, most preferably in the range of 0.1 to 1 wt.-% based on the total weight of the topical composition. 4. The topical composition according to claim 1, wherein the wt.-ratio between the polyglyceryl fatty ester surfactant and the phosphate ester co-surfactant is selected in the range of 8:1 to 1:1, preferably in the range of 6:1 to 2:1, most preferably in the range of 5:1 to 3:1. 5. The topical composition according to claim 1, wherein the polyglyceryl fatty ester surfactant is obtainable by esterification of a fatty acid having 12-22 carbon atoms to one or several hydroxyl groups of a polyglycerol. 6. The topical composition according to claim 1, wherein the phosphate ester surfactant is a compound of formula (I) whereinR1, R2 and R3 are independently of each other hydrogen, C1-22 alkyl, or a C1-22 alkoxylated alkyl having 2 to 25 moles ethylene oxide, with the proviso that at least one of R1, R2 and R3 is an alkyl or an alkoxylated alkyl having at least 6 alkyl carbons in said alkyl or alkoxylated alkyl group. 7. The topical composition according to claim 6, wherein the phosphate ester surfactant is potassium cetyl phosphate. 8. The topical composition according to claim 1, wherein the polyglycerol fatty ester is a compound of formula (II) whereinR4, R5 and R6 are independently of each other hydrogen, a stearoyl and/or an isostearoyl group with the proviso that at least one of R4, R5 and R6 is a stearoyl- and/or an isostearoyl-group andn is an integer selected from the group of 1 to 12, preferably from 2 to 10. 9. The topical composition according to claim 8, wherein the polyglycerol fatty ester is selected from the group consisting of polyglyceryl-3-stearate, polyglyceryl-10-stearate, polyglyceryl-2-diisostearate, polyglyceryl-6-distearate and polyglyceryl-10 diisostearate. 10. The topical composition according to claim 1, wherein the polyglyceryl fatty ester surfactant has an HLB of 5 or greater. 11. The topical composition according to claim 10, wherein the HLB is selected in range of 6 to 15, preferably in the range of 9 to 14. 12. The topical composition according to claim 1, wherein the topical composition is in the form of a serum, an emulsion spray, a milk, a lotion or a cream. 13. Use of a phosphate ester surfactant to reduce the viscosity of a topical composition in the form of an O/W emulsion comprising an oil phase dispersed in an aqueous phase in the presence of a polyglyceryl fatty ester surfactant. 14. A method for reducing the viscosity of a topical composition in the form of an oil-in-water (O/W) emulsion comprising an oil phase dispersed in an aqueous phase in the presence of a polyglyceryl fatty ester surfactant, said method comprising the addition of a phosphate ester co-surfactant. 15. A method of preserving the long-term thermal storage stability of a topical composition in the form of an oil-in-water (O/W) emulsion comprising an oil phase dispersed in an aqueous phase in the presence of a polyglyceryl fatty ester surfactant, said method comprising the addition of a phosphate ester co-surfactant.