ADHESIVE TAPE OR SHEET, AND BASE MATERIAL THEREFOR

摘要

Provided is an adhesive tape or adhesive sheet that can be removed after use, wherein no special components are added to the adhesive agent, allowing freedom in the design of said adhesive agent. Also provided is a base material used in the aforementioned adhesive tape or adhesive sheet. The provided base material is a composite film that has a water-absorption ratio of at least 5% and contains a (meth)acryl polymer and a urethane polymer having a terminal acryloyl group. The (meth)acryl monomer that forms the aforementioned (meth)acryl polymer preferably contains a (meth)acrylate and/or a (meth)acryloyl morpholine.