Patent ID: 8513146

Claim:
A polyester bicomponent staple fiber comprising poly(trimethylene terephthalate) and at least one polymer selected from the group consisting of poly(ethylene terephthalate), poly(trimethylene terephthalate), and poly(tetramethylene terephthalate) or a combination of such members, said bicomponent staple fiber having: a) a scalloped oval cross-section shape having an aspect ratio a:b of about 2:1 to about 5:1 wherein ‘a’ is a fiber cross-section major axis length and ‘b’ is a fiber cross-section minor axis length: b) a polymer interface substantially perpendicular to the major axis; c) side-by-side cross-section configuration; d) a plurality of longitudinal grooves selected from the group consisting of four grooves, six grooves and eight grooves; and e) a groove ratio of about 1.05:1 to about 1.9:1.