Patent ID: 8557885

Claim:
An extruded thermoplastic resin foam having: an apparent density of 20 to 50 kg/m 3 ; a closed cells ratio of 85% or more; and a thickness of 10 to 150 mm; and containing a non-halogen organic physical blowing agent, wherein: a thermoplastic resin composing the extruded foam contains a mixture of 100 parts by weight of a polystyrene resin (A) and 5 to 150 parts by weight of a polyester resin (B), which is a non-crystalline polyester copolymer containing a dicarboxylic acid component and a diol component, wherein a spiroglycol comprises 10 to 80 mol% of the entire diol component that is used to prepare said polyester resin (B) and an endothermic calorific value of the polyester resin (B) is from 0 to less than 5 J/g for fusion of the polyester resin on a DSC curve obtained by heat flux differential scanning calorimetry based on JIS K7122 (1987).