PRODUCTION OF ULTRAFINE OLEFIN FIBER

摘要

PURPOSE:To obtain the subject ultrafine fiber suitable for high performance filter and liquid filter by spinning an olefinic polymer at a specific shearing rate under a specific apparent viscosity condition. CONSTITUTION:The objective ultrafine fiber can be produced e.g. by a melt-blow spinning or jet spinning process of an olefinic polymer having a viscosity of 0.6-1.3 under spinning condition to keep the shearing rate (gamma sec<-1>) of 1000<=gamma<=5X10<4> and an apparent viscosity (eta) of 5300gamma<-8.57=eta<=51300gamma<-8.57> (poise) and preferably using a spinning orifice having an L/D ratio of >=5 (L is length and D is diameter of the orifice) without using a decomposition assistant.