Ester solvents derived from 4-carboxy-2-pyrrolidinone formulated into UV-screening cosmetic compositions

A stable UV-screening cosmetic composition comprising at least one ester solvent derived from 4-carboxy-2-pyrrolidinone, having the formula (I):

• in which:
• R1 is a linear or branched C1-C20 alkyl radical, and
• R2 is a linear or branched C1-C20 alkyl radical optionally containing a C5-C6 ring member, the phenyl radical, the benzyl radical or the phenethyl radical, and at least one liquid fatty phase and at least one lipophilic UV-screening active agent, said at least one ester derivative comprising a solvent for said at least one active agent in said at least one liquid fatty phase and/or comprising an agent for enhancing the solubility of said at least one active agent in said fatty phase, formulated into a topically applicable, cosmetically acceptable medium therefor.