PROBLEM TO BE SOLVED: To provide a polymer capable of adding easy lubricity which is not reduced by rubbing washing to a medical device such as contact lens by a surface treatment, a compound as a monomer forming the polymer, a medical device having the polymer on a surface and easy lubricity added, further a humectant containing the polymer.SOLUTION: There is provided a copolymer containing a compound represented by formula [I] and a specific unsaturated compound as constitutional units. [I], where R1 to R3 are each independently H or an alkyl group, R4 is an alkyl group or a substituent containing a specific ether bond, m and n are each independently an integer of 0-6, and Z is a radical polymerizable group containing a vinyl group or an allyl group.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】表面処理により、コンタクトレンズのような医療デバイスに、こすり洗いによっても低下することのない易滑性を付与できるような高分子、また、前記高分子を形成するモノマーとしての化合物、また、上記高分子を表面に有し、易滑性が付与された医療デバイス、さらに、上記高分子が含まれてなる湿潤剤の提供。【解決手段】構成単位として式[I]で表される化合物と特定の不飽和化合物を含む共重合体。[R1~R3は夫々独立にH又はアルキル基;R4はアルキル基又は特定のエーテル結合を含む置換基;m及びnは、夫々独立に0~6の整数;Zは、ビニル基又はアリル基を含むラジカル重合可能な重合性基]【選択図】なし
