Graphene nanocomposites are one of the most promising candidates in the development of materials for the 21st century. This is due to the extraordinary properties of graphene such as modulus of 1.1 TPa, strength 130 GPa and thermal conductivity 5000 W / mK, which make graphene an interesting additive for numerous applications in polymer materials. The graphene-based nanocomposites have been investigated by a large majority in very small quantities, for example by in situ polymerization or dispersing processes in polymer solutions, whose implementation on an industrial scale currently seems illusory. On the other hand, there are very few publications on the preparation of GnP nanocomposites by melt processing. In a current project, therefore, methods and formulations were investigated with which graphene nanoplatelets can be introduced into a polymer matrix by melt compounding. By predispersing the graphene nanoplatelets in an ionic liquid with the aid of ultrasound, an improved dispersion of the graphene structures and a change in the crystallization behavior is achieved. Electron microscopy and rheological studies suggest that processing and sonication reduce the aspect ratio, which is important for many applications, but in no case graphene nanocomposites as lately defined with less than 20 layers were achieved.