Suncare compositions

A suncare formulation, comprising:

• a dermatologically acceptable organic carrier;
• a UV radiation absorbing agent;
• an SPF booster, wherein the SPF booster comprises a multistage polymeric particle, comprising:
• (i) a core, wherein the core comprises, as polymerized units, 20 to 60 wt %, based on weight of the core, of a monoethylenically unsaturated carboxylic acid core monomer;
• and 40 to 80 wt %, based on weight of the core, of a non-ionic ethylenically unsaturated core monomer;
• (ii) an inner shell, wherein the inner shell comprises, as polymerized units, 90 to 99.9 wt %, based on weight of the inner shell, of a non-ionic ethylenically unsaturated inner shell monomer;
• 0.01 to 9.95 wt %, based on weight of the inner shell, a monoethylenically unsaturated carboxylic acid inner shell monomer;
• and 0.05 to 9.99 wt %, based on weight of the inner shell, of an aliphatic inner shell monomer selected from the group consisting of allyl acrylate, allyl methacrylate and mixtures thereof;
• (iii) an outer shell, wherein the outer shell comprises, as polymerized units, 10 to 45 wt %, based on weight of the outer shell, of a non-ionic ethylenically unsaturated outer shell monomer;
• 50 to 88.9 wt %, based on weight of the outer shell, of an aliphatic outer shell monomer selected from the group consisting of allyl acrylate, allyl methacrylate and mixtures thereof;
• 0.1 to 10 wt %, based on weight of the outer shell, of a monoethylenically unsaturated non-carboxylic acid outer shell monomer;
• and, 1 to 25 wt %, based on weight of the outer shell, of an ethylenically unsaturated surfactant outer shell monomer;
• wherein the core, when dry, contains at least one void;
• and wherein the multistage polymeric particle has an average particle size, when dry, of 50 to 1,000 nm.