Patent ID: 7736564
Filing Date: 2010-06-15
Classification: D01F,D02J,Y10T

Abstract:
1. A process for producing a high strength polyolefin filament, comprising: melt-extruding a non-drawn polyolefin filament without using a mixture of a polymer and a solvent for the polymer as a melt-extrusion material at a ratio of spinning speed to velocity of fluid product issuing from a spinneret of 100 or more; drawing the non-drawn polyolefin filament at a temperature not higher than 65° C. to produce a high strength polyolefin filament, wherein the polyolefin of the non-drawn polyolefin filament is a polyethylene consisting essentially of ethylene and having a weight-average molecular weight of 60,000-300,000, and a ratio of a weight-average molecular weight to a number-average molecular weight (Mw/Mn) of 4.5 or less, and wherein the total draw ratio from spinning to drawing is 3,000 or more.