Extruded thermoplastic resin foam

Abstract

The present invention relates to an extruded thermoplastic resin foam, particularly relates to a board extruded thermoplastic resin which has low heat conductivity, an excellent heat insulating property over a long period of time, high flame retardancy, and excellent mechanical strength. The extruded thermoplastic resin foam having an apparent density of 20 to 50 kg/m3, 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 the 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), and an endothermic calorific value of the polyester resin (B) less than 5 J/g (including 0) for fusion of the polyester resin on a DSC curve obtained by heat flux differential scanning calorimetry based on JIS K7122 (1987).

Dependencies are inferred from the claim text.