SMALL DIAMETER POLYOLEFIN FIBERS

摘要

Prepare a polyolefin fiber having a diameter of 10 microns or less by extruding a molten polyolefin through die holes having diameters in a range of 250 to 500 microns to produce molten polyolefin fibers; drawing the molten polyolefin fibers to achieve a molten draw ratio in a range of 150 to 500 at a temperature in a range of 200 to 250 degrees Celsius; and drawing the polyolefin fibers in a solid state to achieve a solid state draw ratio of 3.0 to 4.0 at a temperature in a range of 40 to 100 degrees Celsius to produce polyolefin fibers having a diameters of 10 microns or less; where the polyolefin is characterized by being a polyolefin copolymer of ethylene and one or more than one alpha-olefin and where the copolymer has a solid density of 0.870 or more and 0.96 or less as determined according to ASTM D792.

主权项

1. A process comprising:
(a) extruding a molten polyolefin through die holes of a die where the die hole diameters are in a range of 250 to 500 microns to produce fibers of molten polyolefin; (b) drawing the fibers of molten polyolefin to an extent characterized by a molten draw ratio in a range of 150 to 500 at a temperature in a range of 200 to 250 degrees Celsius; and (c) drawing the polyolefin fibers in a solid state to an extent characterized by a solid state draw ratio of 3.0 to 4.0 at a temperature in a range of 40 to 100 degrees Celsius to produce polyolefin fibers having a diameters of 10 microns or less;where the polyolefin is characterized by being a polyolefin copolymer of ethylene and one or more than one alpha-olefin and where the copolymer has a solid density of 0.870 or more and 0.96 or less as determined according to ASTM D792.