EXTRUSION PROCESS FOR DIFFICULTLY-MELT-PROCESSIBLE POLYMERS

摘要

Improved process for extruding through a die a difficultly-melt-processible polymer, especially a polymer containing an additive such as an antiblock agent. There is first extruded through the die a polymer resin containing 0.001 to 1 wt. % of a copolymer of tetrafluoroethylene and a functional-group-containing monomer that is terminated in a -CF2W group wherein W is selected from -SO2F, -SO2Cl, -SO3M, -COOR and -COOM, R is a C1-3 alkyl radical and M is H, a metal cation or an ammonium or quaternary ammonium cation, and thereafter there is extruded through the die the difficultly-melt-processible polymer admixed with 0.001-1 wt. % of a fluoropolymer process said having a fluorine to carbon ratio of at least 1:2.