EXTRUSION PROCESS FOR DIFFICULTLY-MELT-PROCESSIBLE POLYMERS

摘要

Greatly improved extrusion of compositions comprising difficultly-melt-processible polymers containing fluoropolymer process aids blended therein is achieved by the process of this invention wherein, prior to extrusion of the composition through the extruder and the die, another composition comprising a polymer resin containing a functionalized fluorinated copolymer that is comprised of copolymerized units of tetrafluoroethylene and a functional-group-containing fluoromonomer is first passed through the extruder and the die.