The present invention provides a resin modifier capable of obtaining a coating film having satisfactory basic performances such as antistatic properties, water resistance and transparency, a method for producing a coating film using the resin modifier, and a coating film obtained by the production method. The resin modifier of the present invention is a resin modifier represented by R
31
—O-(AO)
n
—SO
3
−
, R
32
—OSO
3
−
, or R
33
—SO
3
−
and an ammonium ion that has a polymerizable unsaturated group.
本发明提供了一种
树脂改性剂,能够获得具有良好基本性能,如抗静电性能、耐
水性和透明性的涂层膜,以及使用该
树脂改性剂生产涂层膜的方法和通过该生产方法获得的涂层膜。本发明的
树脂改性剂是由R31—O-(AO)n—SO3−、
R32—OSO3−或R33—SO3−和具有聚合可不饱和基团的
铵离子表示的
树脂改性剂。