COATED SORBENTS AND METHODS OF MAKING

摘要

A sorbent compound for melt extrusion in a polymer includes a particulate porous sorbent having pores extending from the surface into the body of the particle. A lubricating coating that facilitates melt extrusion of the particles with a polymer compound covers the surface, but not the pores. The method includes the steps of hydrating the sorbent to fill the voids or pores in the sorbent with water or other substance that the sorbent is capable of absorbing, coating the hydrated gel with a lubricating material or other material, then removing the water or other substance so that the voids in the gel structure are free from water and not coated with the lubricating material. A substantial portion of the surface of the exterior of the gel particle is thereby coated with the coating material for easy feeding in a compounding feeder while leaving the pores essentially free from coating.