Adhesive sheet, flexible image display device member, optical member, and image display device

Abstract

Provided is a flexible image display device member having a configuration in which two flexible members are adhered together via a novel adhesive layer that can firmly adhere to highly polar member sheets, and has excellent bendability, wherein the adhesive layer has a maximum value of a loss tangent (tan δ) obtained by dynamic viscoelasticity measurement in a shear mode at a frequency of 1 Hz being at −20° C. or lower, and in the Hansen solubility parameters (δd, δp, and δh) on the adhesive layer surface as measured by a contact angle method, the polar term δp is 2.0 MPa0.5 or more and the hydrogen bond term δh is 5.0 MPa0.5 or more.

Dependencies are inferred from the claim text.