| abstract |
Provided are a cured product (for example, a film), in which the balance between hydrophilicity and abrasion resistance is superior, decrease in hydrophilicity by water is minimal, and the weather resistance is also superior, as well as a polymer and a polymer composition that can yield such a cured product. A polymer of the invention is a specific copolymer (i) having a sulfonic acid-containing group, an epoxy group, and a specific alkoxysilyl group in a molecule. |