There is provided a coating agent that may form a base film having excellent adhesiveness to a substrate of a plastic such as a cycloolefin resin and having transparency and a high refractive index. A coating agent comprising a polymer consisting of only a repeating unit derived from a monomer represented by formula (I) (wherein Ar represents a C6 to C10 aryl group optionally having a substituent and Ar is the same or different; X represents an oxygen atom or -NR-; R represents a hydrogen atom or a C1 to C6 alkyl group; and Y represents a polymerizable functional group.)
本发明提供了一种涂层剂,可形成基膜,该基膜与环烯烃
树脂等塑料基材具有良好的粘合性,并具有透明度和高折射率。一种涂层剂,其聚合物仅由由式(I)代表的单体衍生的重复单元组成(其中Ar代表C6至C10芳基,可选择具有取代基,且Ar相同或不同;X代表氧原子或-NR-;R代表氢原子或C1至C6烷基;Y代表可聚合官能团)。