granulated forms of various active ingredients can be prepared with a small amount of a dissolvable polymer and a solvent for that polymer . the solvent dissolves at least a portion of the polymer . this dissolved polymer acts as a particle lubricant for the extrusion process and , when the solvent is removed , as a binder for the final extrudate . a poly is preferred and , in the presence of a small amount of solvent , dissolves sufficiently to provide lubricity to the extrusion mixture that the solids can be extruded with little friction and associated local temperature rise thru the extrusion die .