FOAMED SHEET

摘要

The foamed sheet includes a foamed body having an average cell diameter of 10 to 200 μm, and a compression set at 80° C. of not more than 80% and an impact absorption change rate of not more than ±20% defined by:;Impact absorption change rate (%)={(an impact absorption rate b after high-temperature compression−an initial impact absorption rate a)/the initial impact absorption rate a}×100,;where the impact absorption rate a is an impact absorption rate (%) of a test piece A and the impact absorption rate b (%) after high-temperature compression is an impact absorption rate (%) acquired by storing the test piece A at 80° C. for 72 hours in the state of being compressed by 60% with respect to the initial thickness of the test piece A, thereafter releasing the compression state, and thereafter conducting measurement after a lapse of 24 hours at 23° C.

主权项

1. A foamed sheet, comprising a foamed body having an average cell diameter of 10 to 200 μm, and having a compression set at 80° C. of not more than 80% and an impact absorption change rate of not more than ±20% as defined by the following:
an impact absorption change rate (%)={(an impact absorption rate b after high-temperature compression−an initial impact absorption rate a)/the initial impact absorption rate a}×100, wherein the initial impact absorption rate a: an impact absorption rate (%) of a test piece A; the impact absorption rate b (%) after high-temperature compression: an impact absorption rate (%) acquired by storing the test piece A at 80° C. for 72 hours in the state of being compressed by 60% with respect to an initial thickness of the test piece A, thereafter releasing the compression state, and thereafter conducting measurement after a lapse of 24 hours at 23° C.; and the impact absorption rate: a value defined by the following expression in an impact absorption test (a weight of an impactor: 28 g, a swing-up angle: 40°) (23° C.) using a pendulum impact tester:
an impact absorption rate (%)={(F0−F1)/F0}×100 wherein F0 is an impact force when the impactor is made to collide with a support plate alone; and F1 is an impact force when the impactor is made to collide with the support plate of a structural body composed of the support plate and the test piece A.