Suncare formulation

A polymer blend, comprising:

• (a) 25 to 95 wt %, based on weight solids of the polymer blend, of a single stage polymer,
• wherein the single stage polymer comprises:
• 90 to 99.8 wt % of structural units of a monoethylenically unsaturated non-ionic monomer, wherein the monoethylenically unsaturated non-ionic monomer is selected from the group consisting of a mixture of (i) 58 to 61 wt % of a C1-4 alkyl (meth)acrylate, wherein the C1-4 alkyl (meth)acrylate is a mixture of 33 to 35 wt % of methyl (meth)acrylate and 65 to 67 wt % of n-butyl (meth)acrylate;
• and (ii) 39 to 42 wt % of a C8-22 alkyl (meth)acrylate, wherein the C8-22 alkyl (meth)acrylate is 2-ethylhexyl acrylate;
• 0.19 to 10 wt % of structural units of a monoethylenically unsaturated carboxylic acid monomer, wherein the monoethyleneically unsaturated carboxylic acid monomer is methacrylic acid;
• and
• 0.01 to 2 wt % of structural units of a multiethylenically unsaturated monomer having at least two ethylenically unsaturated groups per molecule, wherein the multiethylenically unsaturated monomer having at least two ethylenically unsaturated groups per molecule is allyl methacrylate (ALMA);
• and
• (b) 5 to 75 wt %, based on weight solids of the polymer blend, of a silicone-grafted vinyl copolymer, wherein the silicone-grafted vinyl copolymer, comprises:
• 25 to 95 wt %, based on weight of the silicone-grafted vinyl copolymer, of structural units of a vinyl monomer, wherein the vinyl monomer is selected from the group consisting of methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, styrene and mixtures thereof;
• and
• 5 to 75 wt %, based on weight of the silicone-grafted vinyl copolymer, of structural units of a carbosiloxane dendrimer of formula (I)
• wherein each R1 is a methyl group;
• wherein each X is a silylalkyl group of formula (II)
• wherein R2 is a C2 alkylene group;
• wherein each R3 is independently a C1-10 alkyl group;
• wherein each Z is independently selected from the group consisting of a hydrogen, a C1-10 alkyl group, an aryl group and a silylalkyl group of formula (II);
• wherein a is 0;
• wherein Y is of formula (III)
• wherein each R4 is a methyl group;
• wherein R5 is a C3 alkylene group.