The invention relates to a polymer blend composed of a polypropylene and/or of a polypropylene copolymer and of another polymer which is incompatible with the polypropylene and/or with the polypropylene copolymer. The polymer is obtained via mixing of the melts of the two polymers with high energy input. After cooling, and also after remelting and further processing via, for example, injection molding, it shows no separation of the phases. The invention further relates to a polymer blend which can be obtained by the inventive process, and also to a molding composed of the polymer blend.