A PROCESS FOR PRODUCING MELTBLOWN POLYOLEFIN FIBRES FOR MECHANICAL FILTRATION

摘要

A process for producing meltblown polyolefin fibres having an effective diameter of less than 5 microns, comprising providing a polyolefin having a melt flow index of at least 1000, mixing a fluorocarbon with the polyolefin in order to increase the melt flow index of the polyolefin to at least 2000, and meltblowing the polyolefin with the fluorocarbon in order to produce the meltblown polyolefin fibres, and the polyolefin being such that during the meltblowing the fluorocarbon is able to migrate to the surface of the formed polyolefin fibres without the need for a separate annealing step.