Resin foam, resin foam sheet, adhesive tape, vehicle member, and building member

A resin foam having a multitude of cells, the resin foam comprising:

• a thermoplastic resin;
• and
• a plasticizer,
• the resin foam having an open cell ratio of 20% or higher,
• the resin foam having a minimum loss factor of a primary anti-resonance frequency in the range of 20° C. to 60° C. of 0.005 or higher and a secondary anti-resonance frequency in the range of 20° C. to 60° C. of 300 to 800 Hz as measured by mechanical impedance measurement (MIM) in conformity with JIS K7391.

A resin foam having a multitude of cells, the resin foam comprising:

• a thermoplastic resin;
• and
• a plasticizer,
• the resin foam having an open cell ratio of 20% or higher,
• the resin foam having a maximum loss factor of a primary anti-resonance frequency in the range of 0° C. to 50° C. of 0.20 or higher and a secondary anti-resonance frequency in the range of 0° C. to 30° C. of 800 Hz or lower as measured by mechanical impedance measurement (MIM) in conformity with ISO 16940.