Pressure-sensitive adhesive layer for optical applications, pressure-sensitive adhesive layer-attached optical film, and image display device

A pressure-sensitive adhesive layer-attached optical film, comprising an optical film;

• and a pressure-sensitive adhesive layer for optical applications provided on at least one side of the optical film, wherein
• the optical film is a polarizing film,
• the polarizing film has a transparent protective film only on one side of a polarizer,
• the pressure-sensitive adhesive layer for optical applications is provided on the polarizer opposite to a side on which the transparent protective film is provided,
• the pressure-sensitive adhesive layer for optical applications is made from a pressure-sensitive adhesive for optical applications comprising a base polymer (A), wherein the base polymer (A) is a (meth)acryl-based polymer comprising an alkyl (meth)acrylate monomer unit, and
• the pressure-sensitive adhesive layer for optical applications of the pressure-sensitive adhesive layer-attached optical film for optical applications comprises 0.02 to 1 atomic % of iodine and/or iodide ions (B),
• wherein the polarizing film is an iodine-based polarizing film comprising an iodine-based polarizer and wherein the iodine-based polarizer contains iodine and/or iodide ions (B), and
• wherein the (meth)acryl-based polymer comprises butyl (meth)acrylate as the alkyl (meth)acrylate monomer unit, and
• wherein the content of the iodine and/or iodide ions (B) of the pressure-sensitive adhesive layer for optical applications is such that the ratio of the iodine and/or iodide ions (B) to a butyl (meth)acrylate-derived ion is from 0.01 to 3.