Multiple extruder assembly and process for continuous reactive extrusion

A multiple extruder reactor apparatus for modifying in the melt state the chemical, rheological or chemical and rheological properties of a polymer or polymers that comprises in combination:

• a. two or more extruders serially connected such that the output of each extruder flows directly into the feed zone of the next extruder and such that the polymer modification and transport process in the connected extruder assembly is continuous from one extruder to the next;
• b. an assembly of mechanical connections and seals between the inter-connected extruders such that no un-stirred, un-contained or unregulated temperature or pressure region exists between any two so connected extruders or anywhere along the flow path of the polymer melt;
• C. an assembly of mechanical connections between the multiple individual extruders and a single continuous supporting base plate or pad such that the thermal expansion and contraction of all extruder barrel and screw assemblies is not restrained along the axis of the extruder barrel and such that all rotational movement of the extruder barrels is restrained;
• d. separate and independently controlled drive motors and gear reduction assemblies for each extruder allowing for equal or differing screw rpm's in each extruder during operation;
• e. a vertical side mounted access port on the connecting zone of the downstream extruders directly opposite to the entry location of the screw shafts of the upstream extruders for the removal of the upstream extruder screw shafts and the addition or removal of liquids, solids or gases during operation;
• and
• f. multiple ports located anywhere along the extruder apparatus for the addition or removal of liquids, solids or gases.