A polymer blend is provided comprising: a single stage polymer and a silicone-grafted vinyl copolymer； wherein the single stage polymer comprises: structural units of a monoethylenically unsaturated non-ionic monomer； structural units of a monoethylenically unsaturated carboxylic acid monomer； and structural units of a multiethylenically unsaturated monomer having at least two ethylenically unsaturated groups per molecule； and wherein the silicone-grafted vinyl copolymer, comprises: structural units of a vinyl monomer； and structural units of a carbosiloxane dendrimer of formula (I). Also provided is a suncare formulation comprising the polymer blend in a dermatologically acceptable carrier with a suncare active.提供一種聚合物摻合物，其包含：一段聚合物及聚矽氧接枝乙烯基共聚物；其中該一段聚合物包含：單乙烯系不飽和非離子單體之結構單元；單乙烯系不飽和羧酸單體之結構單元；及每分子具有至少兩個乙烯系不飽和基團之多乙烯系不飽和單體之結構單元；且其中該聚矽氧接枝乙烯基共聚物包含：乙烯基單體之結構單元；及式(I)之碳矽氧烷樹枝狀聚合物之結構單元。亦提供一種防曬配方，其包含在皮膚學上可接受之載劑中的聚合物摻合物及防曬活性成分。
