Granulation of powders of thermoplastic polymer e.g. polyolefin, comprises adding preset amount of organic solvent or suspension medium to polymer powder and melting, homogenizing, pressing and granulating obtained mixture

摘要

The thermoplastic polymer powder prepared in a polymerization reactor is mixed with 0.001-20 wt.% of organic solvent or suspension medium based on total weight of polymer powder and solvent or suspension medium. The obtained mixture is introduced to an extruder, melted and homogenized. The homogeneous mixture is then pressed through an extrusion die and granulated. Independent claims are included for the following: (1) method for increasing throughput of thermoplastic polymer powder through an extruder; and (2) method for decreasing energy consumption of extruder.