FUNDAMENTALS OF MELT FRACTURE ELIMINATION USING FLUOROPOLYMER PROCESS AIDS

摘要

Fluoropolymer process aids are widely used in polyolefin blown films to eliminate melt fracture. These process aids function by depositing a thin fluoropolymer layer on internal die surfaces, and promoting slip at the fluoropolymer - polyethylene interface. The present work describes how the morphology of fluoropolymer -polyethylene blends can be controlled to increase fluoropolymer deposition rate by using a new, rheology-modified fluoropolymer in combination with an interfacial agent.