Patent ID: 6720467
Filing Date: 2004-04-13
Classification: C08J,Y02W

Abstract:
A process for reclaiming waste polystyrene plastic materials, said process comprising the steps of(1) dissolving the waste polystyrene material in a reusable polystyrene solvent in a dissolve unit, (2) transferring the resulting solution of polystyrene material to a preheater unit, (3) superheating the solution of polystyrene material to a temperature of less than 190Â° C. in the preheater unit, (4) transferring the superheated solution of polystyrene material to an extruder, (5) devolatilizing the solution of polystyrene material at different points as it moves through the extruder while maintaining its temperature at less than 190Â° C., and (6) recovering the extrudate reclaimed polystyrene material in solid form.