THERMOPLASTIC RESIN FOAM AND FOAM-BASED SEALING MATERIAL

摘要

One of the purposes of the present invention is to provide a resin foam having excellent processability by imparting remarkable shear fracture anisotropy in a specific direction with the flexibility kept. The other of the purposes thereof is to provide a foam-based sealing material. The present invention pertains to a resin foam which comprises a thermoplastic resin, said resin foam being characterized in that: the maximum breaking strength (Smax) of the foam is 0.1 to 3MPa; and the Smax/Smin ratio thereof is 1.5 to 6 [wherein Smin is the breaking strength of the foam in the direction perpendicular to the direction in which the maximum breaking strength is observed]. Further, it is preferable that the breaking elongation (SSmax) of the foam in the direction in which the maximum breaking strength is observed is 200% or less with the SSmax/SSmin ratio being 1.5 to 6 [wherein SSmin is the breaking elongation of the foam in the direction perpendicular to the direction in which the maximum breaking strength is observed].