MIXING

摘要

The invention describes a process for the production of a polysiloxane containing mass, incorporating surface treated filler material, by continuously feeding materials to a screw extruder (12) in which they are mixed and conveyed to an outlet (14) with removal of gaseous materials therefrom. The screw extruder (12) has at least two screws (22) located in communicating chambers distributed radially about a common axis (26) and extending with the axis of each screw parallel to the common axis (26). The materials being mixed in the extruder typically comprise: a) a polysiloxane, b) a reinforcing filler and c) a hydrophobing agent. Each material is fed into the extruder (12) as the material itself or in admixture with any one or more of the others of (a), (b) and (c).