RESIN FOAM SUITABLE AS ENERGY ABSORPTION MATERIAL

摘要

Disclosed is a form which has the same level of impact absorption property as that of a hard polyurethane foam, shows a little increase in volume when absorbs moisture, and is suitable as an energy absorption material such as a bumper core and a side impact material. Specifically disclosed is a thermoplastic resin foam, which is characterized by having a ratio between a load at 70% deformation (F<SUB>70%</SUB>) and a load at 20% deformation (F<SUB>20%</SUB>) (i.e., a (F<SUB>70%</SUB>)/(F<SUB>20%</SUB>) ratio) as determined by a dynamic compression test of 0.70 to 1.30 inclusive, and more preferably having an anisotropy ratio for each cell of 1.1 to 3.0 inclusive.