| abstract |
Provided is an optical double-sided adhesive sheet having excellent adhesion to bending, torsional and torsional stresses. The optical double-sided adhesive sheet of this invention has the adhesive layer whose storage elastic modulus (80 degreeC) is 2 * 10 < 4> Pa or more, and the loss elastic modulus (80 degreeC) is 1 * 10 < 4> Pa or more, and the peeling force by an L-shaped peeling test It is 0.16 Mpa or more, The peeling distance by a static load peel test is 50 mm or less, It is characterized by the above-mentioned. In the L-shaped peeling test, the L-shaped stainless steel jig and the acrylic plate are bonded through a double-sided adhesive sheet and treated at 50 ° C and 5 atmospheres for 15 minutes, and then the stainless steel jig is stretched in a direction perpendicular to the surface of the acrylic plate. And peeling force is measured. In the static load peeling test, a double-sided pressure-sensitive adhesive sheet was attached to the acrylic plate and treated at 50 ° C and 5 atmospheres for 15 minutes, and then a load of 100 gf was applied to one end in the longitudinal direction of the double-sided pressure-sensitive adhesive sheet in the direction perpendicular to the surface of the acrylic plate. In addition, the peeling distance of the double-sided adhesive sheet after 3 hours progress is measured. |