Polyolefin fiber and method of producing the same

Details Polyolefin fiber and method of producing the same Polyolefin fiber and method of producing the same

2011-01-11

2011-01-11

Salvatore, Lynda (Department: 1786)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Noninterengaged fiber-containing paper-free web or sheet...

C264S164000, C264S171110

Reexamination Certificate

active

07867607

ABSTRACT:
A polyolefin fiber includes 0.2 to 5.0 wt % of hydrophilic additive, and 0.05 to 3.00 wt % of titanium dioxide (TiO2). The polyolefin fiber may further include 0.2 to 1.0 wt % of spin finish provided on a surface thereof. The polyolefin fiber is spun to have a circular section, a modified cross-section including an X-shaped section, a Y-shaped section, a deltaic section, an oval section, a diamond section, a bladebone-shaped section, and a combined section thereof, or a combined section of the circular section and the modified cross-section. A method of producing a polyolefin fiber includes (a) melt extruding a composition which contains 93 to 99 wt % of polyolefin resin, 0.2 to 5.0 wt % of hydrophilic additive, and 0.05 to 3.00 wt % of any one titanium dioxide (TiO2) of rutile titanium dioxide, anatase titanium dioxide, and brookite titanium dioxide at 240 to 300° C. and performing winding at a spin speed of 500 to 2,000 mpm to produce a undrawn yarn, and (b) drawing the undrawn yarn at a draw ratio of 1.0 to 5.0, crimping the drawn yarn to 5.5 to 9.0 ea/cm by using a crimper, attaching 0.2 to 1.0 wt % of spin finish to a surface of the fiber by spraying or dipping, heat setting the spin finish at 100 to 130° C. for 3 to 10 min, and cutting the resulting polyolefin fiber to predetermined lengths.

REFERENCES:
patent: 6177191 (2001-01-01), Gupta et al.
patent: 2004/0043209 (2004-03-01), Schnurer et al.
patent: 2007/0167549 (2007-07-01), Bornemann et al.

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