Abstract: Heat-resistant, high-impact thermoplastic resin compositions comprising a graft copolymer (A) obtained by graft-copolymerizing an aromatic vinyl compound and an unsaturated carboxylic acid anhydride onto a rubbery polymer; a composite modifier (B) obtained by graft-copolymerizing an aromatic vinyl compound and a methacrylate ester monomer onto a diene rubber polymer; and an aromatic polycarbonate resin (C).

Abstract: A foamed body having an annular ring pattern in cross-section is prepared by blending a powdery or particulate styrene resin A and a powdery or particulate styrene resin B and molding the blend by extrusion or injection molding. The resin A particles have foaming components incorporated on the surfaces thereof, prior to blending same with resin B. The resin B has a lower fluidity than that of resin A by a difference of melt index of 1 to 20, it has a particle size larger than that of the resin A powder or particles, it is free of foaming component, it has a color different from that of powdery or particulate resin A, and it is compatible with resin A.