Cushioning adhesive sheet and cushioning structure

摘要

A cushioning adhesive sheet for which the cushioning ability is not likely to be deteriorated with time, by applying an airtight space having a comparatively large volume on an adherend and maintaining the airtight space stably with time. The cushioning adhesive sheet comprises: i) a base part; and ii) a convex part consisting of a crosslinked adhesive polymer and having an adhesive surface, which is provided on at least one major surface of the base part so as to enclose a plurality of concave parts having a geometric shape; wherein a volume of the concave part is 0.8 to 600 mm3, a modulus G of the convex part measured according to a dynamic viscoelasticity measuring method at a frequency of 1 rad/second under shear mode at 25 DEG C is within a range of 5 x 105 to 4 x 106 dynes/cm2, and a decrease of log10G within a range of 25 to 125 DEG C is less than 1.0.