Transparent double-sided adhesive sheet for image display device and image display device using the same

摘要

A novel transparent double-sided adhesive sheet for image display device is provided, that, under the constraint of holding down the thickness of the adhesive sheet to 250 μm or less, can relieve a distortion arising within the adhesive sheet after laminating even if a member has a stepped portion of 50 μm to 100 μm in height on the laminating surface.;Proposed is a transparent double-sided adhesive sheet for image display device which is used for the purpose of laminating an image display device constitutive member having on a laminating surface a stepped portion of 50 μm to 100 μm in height and a flat surface portion, and another image display device constitutive member, wherein a thickness of the maximum thickness portion of the adhesive sheet is 250 μm or less, and a gel fraction (a) at a position in contact with a stepped portion after laminating is 10% or greater and smaller than a gel fraction (b) at a position in contact with a flat surface portion.

主权项

1. A transparent double-sided adhesive sheet, comprising:
a first portion having a gel fraction of 10% or greater, and a second portion having a gel fraction that is greater than the gel fraction of the first portion, wherein the transparent double-sided adhesive sheet is suitable for laminating an image display device constitutive member comprising a stepped portion of 50 μm to 100 μm in height on a laminated surface thereof and a flat surface portion to another image display device constitutive member, a maximum thickness of the adhesive sheet is 250 μm or less, the first portion is suitable for contacting the stepped portion when laminated, the second portion is suitable for contacting the flat surface portion when laminated, and a difference between the gel fraction of the first portion and the gel fraction of the second portion is from 5 to 30%.