The purpose of the present invention is to provide: a surface treatment liquid that is capable of favorably hydrophilizing or hydrophobing surfaces of an object to be treated without having to include a film forming resin; and a surface treatment method using the surface treatment liquid. The present invention provides a surface treatment liquid which comprises (A) a resin and (C) a solvent, wherein as (A) the resin, a resin is used which has a weight average molecular weight of 100000 or more and contains a functional group I which comprises one group or more selected from the group consisting of a hydroxyl group, a cyano group, and a carboxyl group, and a functional group II which is a hydrophilic group or a hydrophobic group other than the functional group I.
本发明的目的是提供:一种表面处理液,它能够使待处理物体的表面亲
水或吸
水,而不必包括成膜
树脂;以及一种使用该表面处理液的表面处理方法。本发明提供了一种表面处理液,它由(A)
树脂和(C)溶剂组成,其中作为(A)
树脂,所使用的
树脂的重量平均分子量为 100000 或更大,并含有一个官能团 I,该官能团 I 包括一个或多个从羟基、
氰基和羧基组成的组中选出的基团,以及一个官能团 II,该官能团 II 是官能团 I 以外的亲
水基团或疏
水基团。