Oil-in-water emulsion containing an amphiphilic polymer

A composition suitable for topical application to a keratin material, in the form of an oil-in-water emulsion, comprising

• an oily phase dispersed in an aqueous phase and:
• (a) one or more nonionic emulsifiers with a melting point of less than 45° C., and
• (b) one or more non-crosslinked polymers comprising (A) 80 mol % to 99 mol % of 2-acrylamido-2-methylpropanesulfonic acid units of formula (I):
• in which X+ is a proton, an alkali metal cation, an alkaline-earth metal cation or an ammonium ion;
• and (B) 1 mol % to 20 mol % of units of formula (II) below:
• in which n and p, independently of each other, denote a number ranging from 0 to 30, with the proviso that n+p is less than or equal to 30;
• R1 denotes a hydrogen atom or a linear or branched C1-C6 alkyl radical, and R2 denotes a linear or branched alkyl radical containing from 16 to 30 carbon atoms,
• wherein the amount of polymer(s) (b) is greater than zero but less than or equal to 0.6% by weight relative to the total weight of the composition, the weight ratio between the amount of polymer(s) (b) and the amount of emulsifier(s) (a) ranges from 0.7 to 1.3,
• and the oily phase is present in an amount greater than zero but less than 40% by weight relative to the total weight of the composition.