The instant invention refers to the use of a concentrated aqueous polymer dispersion with an average particle size of less than 1000 nm comprising (a) a polymer carrier prepared by heterophase radical polymerization of at least one ethylenically unsaturated monomer in the presence of (b) an oil-soluble organic UV absorber selected from the class of p-aminobenzoic acid derivatives； salicylic acid derivatives； benzophenone derivatives； diphenyl acrylate derivatives； benzofuran derivatives； polymeric UV absorbers, comprising one or more organosilicon radicals； cinnamic acid derivatives； camphor derivatives； s-triazine derivatives； trianilino-s-triazine derivatives； menthyl anthranilates； and benzotriazole derivatives； wherein the weight ratio of the oil-soluble organic UV absorber (b) to polymer carrier (a) is greater than 50 parts UV absorber per 100 parts of carrier； for the protection of human and animal hair and skin against the damaging effect of UV radiation.The concentrated aqueous polymer dispersions show unexpectedly high sunscreen effects and a positive skin feeling.本發明係關於平均粒徑小於1000nm的濃縮水性聚合物分散物的用途，其包括(a)聚合物載體，其係藉由至少一種乙烯系不飽和單體及在油溶性紫外線吸收劑之存在下進行雜相自由基聚合反應而製備(b)油溶性有機紫外線吸收劑係選自對－胺基苯甲酸衍生物；水楊酸衍生物；二苯甲酮衍生物；二苯基丙酸酯衍生物；苯並呋喃衍生物；聚合紫外線吸收劑，其包括一或多種有機矽基團；肉桂酸衍生物；樟腦衍生物；s－三嗪衍生物；三苯胺基－s－三嗪衍生物；鄰胺基苯甲酸薄荷酯；以及苯並三唑衍生物；其中油溶性有機紫外線吸收劑(b)對聚合物載體(a)的重量比例為每100份載體大於50份紫外線吸收劑；其係用於保護人和動物毛髮以及皮膚抗紫外線照射的損害效應。
