Patent ID: 8361446

Claim:
A method for enhancing the photostability of cosmetic or dermatologic compositions comprising adding to said compositions an effective stabilizing amount of benzotriazole derivatives of formula wherein R 1 is a random statistical mixture of at least three isomeric branched secondary alkyl groups each having 8 to 30 carbon atoms and having the formula E 1 is a straight-chain C 1 -C 14 alkyl; E 2 is a straight-chain C 4 -C 15 alkyl; wherein the total number of carbon atoms in E 1 plus E 2 is from 7 to 29; and R 2 is C 1 -C 5 alkyl; wherein said compositions further comprise at least one further organic UV absorbers which are a combination of at least one of cinnamic acid derivatives and at least one of dibenzoylmethane derivatives.