Photostable sunscreen compositions containing dibenzoylmethane derivative, e.g., PARSOL TM 1789, and diesters of naphthalene dicarboxylic acid photostabilizers and enhancers of the sun protection factor (SPF)

摘要

A sunscreen composition containing a UV-A dibenzoylmethane derivative, such as 4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane (PARSOL TM 1789), and a stabilizer for the dibenzoylmethane derivative having structure (I): wherein each R', same or different, is an alkyl group, straight or branched chain, having 1 to 22 carbon atoms. These diesters of structure (I) are quite effective in stabilizing the dibenzoylmethane derivative UV-A filter compounds making them more effective, and effective for longer periods of time.