Resin foam and foam sealing material

摘要

There is provided a resin foam excellent in dustproof performance, particularly dustproof performance in a dynamic environment. The resin foam of the present invention has a thickness recovery ratio of 65% or more, wherein the thickness recovery ratio is defined as a ratio of a thickness 1 second after releasing a compressed state to an initial thickness, when the resin foam is compressed for 1 minute in the thickness direction so as to give a thickness equal to 20% of the initial thickness in a 23° C. atmosphere; and then the compressed state is released in a 23° C. atmosphere.

主权项

1. A resin foam having a thickness recovery ratio of 65% or more, wherein the thickness recovery ratio is defined as a ratio of a thickness 1 second after releasing a compressed state to an initial thickness, when the resin foam is compressed for 1 minute in the thickness direction so as to give a thickness equal to 20% of the initial thickness in a 23° C. atmosphere; and then the compressed state is released in a 23° C. atmosphere,
wherein the resin foam has an average cell diameter of 10 to 180 μm, a repulsive stress at 50% compression of 0.1 to 3.0 N/cm2, and an apparent density of 0.01 to 0.10 g/cm3, wherein the repulsive stress at 50% compression is defined as a repulsive load when the resin foam is compressed in the thickness direction so as to give a thickness equal to 50% of the initial thickness in a 23° C. atmosphere, wherein a resin constituting the resin foam includes a thermoplastic resin, and wherein the resin foam has a dynamic dustproofness expressed by less than 100 mm2 and less than 1500 Pixel×Pixel of the total particle area of both the particles adhering to the black acrylic sheet on the side of the aluminum sheet and the particles adhering to the black acrylic sheet on the side of the cover plate.