A copolymer includes a repeating unit of Formula (I) and a repeating unit of Formula (II), a composition includes the copolymer, and an optical film has a layer formed of the composition,
in the Formulae (I) and (II), R1 and R2 represent a hydrogen atom or an alkyl group, L3 and L1 represent a divalent linking group, L2 represents a single bond or a divalent linking group, and L4 represents a single bond or a divalent linking group, L4 does not represent a linking group including —O(C═O)—NH—, X represents a perfluoropolyether group, an alkyl group having a branched structure in which hydrogen is all substituted into fluorine, an alkenyl group, or an alkynyl group, and Y represents a crosslinking group.
一种共聚物包括式(I)的重复单元和式(II)的重复单元,一种组合物包括该共聚物,一种光学薄膜具有由该组合物形成的层、
在式 (I) 和 (II) 中,R1 和 R2 代表氢原子或烷基,L3 和 L1 代表二价连接基团,
L2 代表单键或二价连接基团,L4 代表单键或二价连接基团、L4不代表包括-O(C═O)-NH-在内的连接基团,X代表
全氟聚醚基团、具有支链结构的烷基(其中氢被全部取代为
氟)、烯基或炔基,Y代表交联基团。