Resin composition, the polymer, the cured film and the electronic component

A stretch excellent cured film can be formed of a resin composition on the physical properties, the preferred polymeric as containing component of the composition, the cured film formed from the composition, an electronic component having the cured film I will provide a. A polymer having a structural unit having a cationically polymerizable group represented by (A) a formula (a1) structural units and formula having a hydroxyl group represented by (a2), and (F) a solvent resin composition containing. .BACKGROUND