| abstract |
PROBLEM TO BE SOLVED: To provide a foamed sheet that exhibits excellent shock absorption even when the thickness is very small. SOLUTION: The foamed sheet of the present invention has a thickness of 30 to 500 μm, a density of 0.2 to 0.4 g / cm 3 and a storage elastic modulus at an angular frequency of 1 rad / s in dynamic viscoelasticity measurement. The loss tangent (tan δ), which is the ratio of the loss modulus, is made of a foam having a peak top in the range of −30 ° C. or higher and 30 ° C. or lower. The average cell diameter of the foam is, for example, 10 to 150 μm. The maximum value of the loss tangent (tan δ) in the foam in the range of −30 ° C. to 30 ° C. is preferably 0.2 or more. [Selection figure] None |