| abstract |
The present invention is a composite staple fiber comprising poly (ethylene terephthalate) and poly (trimethylene terephthalate), having an aspect ratio A: B of about 2: 1 to about 5: 1, where A is the fiber cross-sectional major axis length. , B is a fiber cross-sectional minor axis length), a cross-sectional structure selected from the group consisting of a substantially oval cross-sectional shape, a polymer interface substantially perpendicular to the major axis, side-by-side, and eccentric sheath-core Tenacity at 10% elongation of about 1.1 cN / dtex to about 3.5 cN / dtex, free fiber length retention of about 40% to about 85%, and tow crimp expression value of about 30% to 55% And a spun yarn including the composite staple fiber. |