PURPOSE: To provide the titled compsn. giving moldings which has an improved rigidity at a high temp., a high impact strength at a low temp. and a fine surface and does not cause surface peeling, by blending a specified polycarbonate with a modified PP.

CONSTITUTION: 1W100pts.wt. 4,4'-dioxydiphenylalkane polycarbonate such as 4,4'- dioxydiphenylmethane polycarbonate is melt-mixed with 100pts.wt. unsaturated carboxylic acid-modified PP such as maleic acid-modified PP. The mixture is pelletized. This PP resin compsn. gives moldings which has a greatly improved rigidity particularly at a high temp., a high impact strength at a low temp. and a fine surface and no fear of causing surface peeling without causing problems that the compsn. is expanded during extrusion to thereby lower the strength, the appearance of the moldings is damaged or silver streak is formed during injection molding.