Novel skin tanning composition

Abstract

A skin tanning composition comprising (a) 5 to 50% by weight of an oil fraction of straight or branched paraffinic oils of 10 to 30 carbon atoms with a boiling range of 100° to 500° C. at atmospheric pressure and a viscosity of at most 35 centistokes at 25° C., optionally containing up to 6% by weight of esters of optionally unsaturated higher natural fatty acids and optionally unsaturated natural aliphatic alcohols of up to 20 carbon atoms, (b) 1 to 10% by weight of an emulsifying system comprising (1) 1 to 10% by weight of mono and/or diglycerides of higher optionally unsaturated natural fatty acids and (2) ethoxylated glycerides esterified with fatty acids of the formula ##STR1## wherein n is an integer from 5 to 20 and the R's are individually an optionally unsaturated fatty acid residue derived from animal or vegetable oils with a ratio of 10 to 100 parts by weight of (1) per part by weight of (2), (c) .Iadd.(.Iaddend.1.0 to 5% by weight of a mixture.Iadd.) .Iaddend..Iadd.1 to 5% by weight of panthenol and 0.5 to 5% by weight of tyrosine or tyrosine precursor in a molar ratio .Iaddend.of 2:1 to 1:3 of tyrosine or tyrosine precursor to panthenol, (d) sufficient alkali to maintain the pH of the aqueous phase at 4 to 7, (e) 0.2 to 4% by weight of a montmorillonite stablizer with free oxygen sites occupied by quaternary groups, (f) 0.5 to 1.0% by weight of a preservative for the formed continuous phase and (g) water to make up 100% by weight, the weights being based on the weight of the entire composition to effect relatively fast skin tanning upon exposure to natural sun light or from artificial sun tanning equipment such as sunbeds and solaria while avoiding exposure to compounds which can disturb the biological equilibrium of the skin.

What is claimed is: 
     
       1. A skin tanning composition comprising (a) 5 to 50% by weight of an oil fraction of straight or branched paraffinic oils of 10 to 30 carbon atoms with a boiling range of 100° to 500° C. at atmospheric pressure and a viscosity of at most 35 centistokes at 25° C., containing 0 to 6% by weight of esters of saturated or unsaturated higher natural fatty acids and saturated or unsaturated natural aliphatic alcohols of up to 20 carbon atoms, (b) 1 to 10% by weight of of an emulsifying system comprising (1) to 10% by weight mono and/or diglycerides of higher saturated or unsaturated natural fatty acids and (2) ethoxylated glycerides esterified with fatty acids of the formula ##STR4## wherein n is an integer from 5 to 20 and the R's are individually a saturated or unsaturated fatty acid residue derived from animal or vegetable oils with a ratio of 10 to 100 parts by weight of (1) per part by weight of (2), (c) .[.1.0 to 5% by weight of a mixture.]..Iadd.1 to 5% by weight of panthenol and 0.5 to 5% by weight of tyrosine or tyrosine precursor in a molar ratio .Iaddend.of 2:1 to 1:3 of tyrosine or tyrosine precursor to panthenol, (d) sufficient alkali to maintain the pH of the aqueous phase at 4 to 7, (e) 0.2 4% by weight of a montmorillonite stabilizer with free oxygen sites occupied by quaternary groups, (f) 0.05 to 1.0% by weight of a preservative for the formed continuous oily phase and the dispersed aqueous phase and (g) water to make up 100% by weight, the weights being based on the weight of the entire composition. 
     
     
       2. A composition of claim 1 wherein (a) the paraffinic oils have 15 to 25 carbon atoms and the oil fraction is 10 to 40% by weight of the composition, (b) η is an integer from 7 to 15, (c) the panthenol is D-panthenol .Iadd.in an amount of 2 to 4% by weight and the tyrosine is L-tyrosine and the amount .[.of each of those components is 0.5 to 5%.]. .Iadd.is 1 to 4%by weight, .Iaddend.(d) the pH is 4 to 6 and the alkaline agent is sodium citrate and/or sodium hydroxide. 
     
     
       3. A composition of claim 1 wherein it further contains at least one ingredient selected from the group consisting of vitamin E is an amount of 0.05 to 5% by weight, glycerol in an amount of 0.5 to 5.0% by weight, alkanol in an amount of 0.1 to 1.0% by weight, sodium lactate in an amount of 0.1 to 5% by weight, gel forming agent in an amount of 0.1 to 5% by weight, perfume in an amount of 0.1 to 0.5% by weight and antioxidants in an amount of 0.01 to 3% by weight, calculated on the weight of the complete composition. 
     
     
       4. A composition of claim 1 wherein it contains an oil fraction in an amount of 10 to 40% by weight. 
     
     
       5. A composition of claim 1 wherein the oil fraction is mixed with oleyl oleate or oleyl decalate in an amount of 2 to 5% by weight, calculated on the weight of the complete composition. 
     
     
       6. A composition of claim 1 wherein the emulsifying system is composed of ethoxylated triglycerides derived from linoleic acid, oleic acid, linolenic acid or mixtures thereof mixed with mono and/or diglycerides derived from linoleic acid, linolenic acid, oleic acid, palmitic acid, lauric acid, myristic acid, stearic acid, eleostearic acid and mixtures thereof. 
     
     
       7. A composition of claim 1 wherein the ratio between mono and/or diglycerides and ethoxylated triglycerides is 25 parts mono and/or diglycerides per part of ethoxylated triglycerides. 
     
     
       8. A composition of claim 1 wherein the preservative in the oily phase is at least one ester of p-hydroxybenzoic acid in an amount of 0.2 to 4% by weight. 
     
     
       9. A process for the preparation of a composition of claim 1 comprising preparing an oily phase by addition of the emulsifying system, preservative and stabilizer to the oily components with stirring and heating until gelation after addition of alcohol followed by cooling to at most 30° C. and addition of the aqueous phase composed of water, preservative, glycerol, panthenol, tyrosine or tyrosine providing compound sufficient alkali and carraghenate. 
     
     
       10. In a method of tanning skin, the improvement comprising applying 20 to 100 ml/m 2  skin area of a composition of claim 1 to the skin area involved and then subjecting the skin to the exposure of natural or artificial sunlight.