Patent ID: 8268444

Claim:
A crimping conjugate fiber, comprising a first component and a second component, wherein the first component comprises a polymer blend containing at least 60 mass % and no greater than 95 mass % of polybutene-1 with at least 5 mass % and no greater than 40 mass % of olefin-based polymer different from the polybutene-1, the second component comprises a polymer having a melting peak temperature higher than that of the polybutene-1 by at least 20° C., or a polymer having a melting initiation temperature of at least 120° C., in a cross section of the fiber, the first component occupies at least 20% of the surface of the conjugate fiber, and the centroid position of the second component is shifted from the centroid position of the conjugate fiber, the conjugate fiber is an actualized crimping conjugate fiber in which three-dimensional crimps have been developed or a latently crimpable conjugate fiber in which three-dimensional crimps are developed by heating, and the three-dimensional crimps are at least one type of crimps selected from the group consisting of wavy crimps and spiral crimps.