WEB COMPOSED OF ULTRAFINE FIBER OF POLYPHENYLENE SULFIDE AND PRODUCTION OF THE SAME WEB

摘要

PURPOSE:To obtain the subject ultrafine fiber having excellent flexibility and uniform thickness and suitable as a filter, etc., by forming a fiber having a specific average diameter using a melt-blow method. CONSTITUTION:The objective web composed of ultrafine fibers having an average fiber diameter of 0.5-10mum is produced by melting a polyphenylene sulfide containing p-phenylene sulfide unit as =90% of the recurring unit and having a melt viscosity of preferably 200-1,200 poise at 320 deg.C, extruding the molten polymer through an orifice of a nozzle into a hot gas stream and spraying the fibrillated polymer on a collecting face.