Abstract: Apparatus for the high-speed mixing and degasification of viscous materials, especially synthetic resins with and without fillers, wherein two or more reactive components are mixed in an upright container having a downwardly converging portion extending over the lower one third of the vessel, by mixing vanes rotated along the frustoconical wall and carried by a worm or screw extending vertically through a sleeve or mixing tube orbited by the vanes. The screw carries the material to be mixed continuously upwardly through the tube and dispenses it along a downwardly and outwardly diverging apron in a thin layer. The continuous path is heated in sections and the vessel is evacuated.