Polymer polyol and composition thereof and application

The invention relates to polymer polyol and a composition thereof and an application. The polymer polyol is a copolymer which is obtained through copolymerization of acrylic ester containing hydroxyl and acrylic ester free of the hydroxyl. The composition comprises matrix resin, the polymer polyol and a photochromic compound; and the solid content of the hydroxyl in the composition is 1.0-6.0%. The composition is a photochromic coating compound (or named a photochromic coating) which is good in weather resistance and good in compatibility with other functional coatings (such as a prganosilane hard coating or/and an anti-reflective coating). The composition is suitable for preparation of a photochromic coating product for pphthalmic use. 本发明涉及种聚合物多元醇及其组合物和用途。所述聚合物多元醇是：由合羟基的丙烯酸酯与不合羟基的丙烯酸酯经共聚获得的共聚物。所述组合物包括：基体树脂、本发明所述的聚合物多元醇和光致变色化合物，且所述组合物中羟基固含量为1.0％～6.0％。本发明提供的组合物是种耐候性好及与其它功能性涂层(如有机硅烷硬涂层或/和防反射涂层等)相容性好的光致变色涂层组合物(或称为光致变色涂层)，其适合于制备眼科用途的光致变色涂层制品。