Appliation of Fluoropolymer Based Processing Aids in Polypropylene and Thermoplastic Rubber, 1998 Polymers, Laminations & Coatings Conference Proceedings
The use of fluoropolymer based polymer processing aids (PPA) to eliminate melt fracture in polyethylene has been thoroughly reported in the literature. For other polyolefins, like polypropylene, the use of this type of processing aid has had a limited discussion in the literature and is mentioned only briefly in patents and product literature with little or no supporting data. The traditional application of PPA to eliminate melt fracture is less important in polypropylene film extrusion. Shear thinning and oxidative degradation lower the polymer melt viscosity, making it less susceptible to melt fracture. Yet, the use of PPA can be effective for lowering extrusion pressure - increasing polymer throughput, and eliminating die drool (die lip build-up).
Appliation of Fluoropolymer Based Processing Aids in Polypropylene and Thermoplastic Rubber, 1998 Po