Core-shell particles comprising low bulk density carbon in the shell.

Core-shell particles comprising low bulk density carbon, especially graphene, in the shell are disclosed, also dis - closed is a method for producing such core-shell particles, a method for preparing a polymer containing low bulk density carbon, es - pecially graphene, a polymer obtainable by this method and the use of this polymer as or for producing a gas barrier material, an electrically conductive material, a thermally conductive material or a mechanically reinforced material.