Mixture of fatty acid esters of natural origin and its use in cosmetic preparations based on olive oil derivatives
Mixture comprising esters of saturated C 16 -C 18 fatty acid and unsaturated C 16 -C 18 fatty acids with 2-ethyl-hexyl alcohol, said esters being in an amount ranging from 90% to 100% by weight with respect to the total weight of the mixture. The cosmetic compositions containing such a mixture formulated in topical form have a moisturizing, emollient, elasticizing and skin compactness and smoothness improving action.
1. A mixture comprising esters of saturated C 16 -C 18 fatty acids and unsaturated C 16 -C 18 fatty acids with 2-ethyl-hexyl alcohol and an unsaponifiable component, said esters being in an amount ranging from 90% to 100% by weight with respect to the total weight of the mixture and said unsaponifiable component being in an amount ranging from 0.2% to 2.0% by weight with respect to the total weight of the mixture.
2. The mixture according to claim 1 wherein said esters are in an amount ranging from 97.0% to 99.9% by weight with respect to the total weight of the mixture.
3. The mixture according to claim 1 wherein said saturated C 16 -C 18 fatty acids and unsaturated C 16 -C 18 fatty acids are oleic acid, linoleic acid, palmitic acid and stearic acid.
4. The mixture according to claim 1 wherein the aforementioned mixture of esters consists of 55.0 to 83.0% by weight of oleic acid ester, 3.5 to 21% by weight of linoleic acid ester, 7.5 to 20.0% by weight of palmitic acid ester and 0.5 to 5.0% by weight of stearic acid ester.
5. The mixture according to claim 4 wherein the aforementioned mixture of esters consists of 60.0 to 75.0% by weight of oleic acid ester, 5.0 to 12.0% by weight of linoleic acid ester, 13.0 to 17.0% by weight of palmitic acid ester and 3.0 to 5.0% by weight of stearic acid ester.
6. The mixture according to claim 1 , characterised in that it also comprises esters of 2-ethyl-1-hexyl alcohol with polyunsaturated C 18:3 fatty acids and C 20 -C 24 fatty acids, both saturated and unsaturated, such esters being in an amount of between 0.1% and 1.5% by weight with respect to the total weight of such a mixture.
7. Process for preparing the mixture according to claim 1 , comprising the following stages:
stage (a): comprising saponification of the esters of olive oil that takes place using strong bases and operating at a high temperature, subsequent acidification with a strong acid and separation of the organic phase; and
stage (b): comprising esterification of free fatty acids obtained in stage (a) with 2-ethyl-1-hexyl alcohol.
8. A cosmetic preparation comprising the mixture according to claim 1 in an amount varying from 1 to 15% by weight with respect to the weight of the total preparation.
9. The preparation of claim 8 wherein the mixture is in an amount of between 2 and 10% by weight with respect to the weight of the total preparation.
10. The preparation according to claim 8 formulated in cream form.
11. The preparation of claim 10 formulated in the form of an oil in water emulsion or a water in oil emulsion.
12. A method of stabilizing a cosmetic preparation comprising adding a stabilizing amount of the mixture of claim 1 to the cosmetic preparation, wherein the amount of said mixture is from 1 to 15% by weight with respect to the weight of the total preparation.
13. A method of maintaining skin's hydration and/or elasticity comprising topically applying the preparation of claim 8 to skin.
14. The mixture according to claim 1 , wherein said esters are in an amount ranging from 98.5% to 99.9% by weight with respect to the total weight of the mixture.
15. A method of improving skin compactness and/or skin smoothness comprising topically applying the preparation of claim 8 to skin.