Patent ID: 8951508
Filing Date: 2015-02-10
Classification: A61K,A61Q,C08G,C08L

Abstract:
1. A method to enhance solubility of butyl methoxydibenzoylmethane and/or bis-ethylhexyloxyphenol methoxyphenyl triazine in cosmetic oils suitable as solvents for butyl methoxydibenzoylmethane and/or bis-ethylhexyloxyphenol methoxyphenyl triazine which comprises adding a solubility enhancing effective amount of a polyglycerol-based UV filter to a composition comprised of butyl methoxydibenzoylmethane and/or bis-ethylhexyloxyphenol methoxyphenyl triazine and a cosmetic oil suitable as a solvent therefore, wherein the polyglycerol-based UV filter is obtained by a process comprising the steps of: a) ring-opening polymerization of x mol equivalents of glycidol using 1 mol equivalent of a polyol starter unit with y mol equivalents hydroxyl-groups, followed by b) block copolymerization with z X (x+y) mole equivalents of propyleneoxide to form a hyperbranched polyether-polyol backbone carrying (x+y) mol equivalents hydroxyl-groups, followed by c) partial or total esterification of the hydroxyl groups with p-dimethylamino benzoic acid, wherein x is an integer from 3-16, y is an integer from 1-6, and z is an integer from 0-10, wherein 30 to 80% of the hydroxyl groups of the hyperbranched polyether-polyol backbone are esterified with p-dimethylamino benzoic acid, and wherein residual terminal hydroxyl groups are linked to a capping group which is a 2-ethyl hexanoyl group, an acetyl group and/or a 3,5,5-trimethylhexanoyl group; and wherein the cosmetic oil is diisopropyl sebacate or a C12-15 alkyl benzoate.