Patent ID: 8389426

Claim:
A bicomponent fiber composed of a polyethylene-based resin (A) and a high-melting point resin (B) whose melting point is higher than that of the above polyethylene-based resin (A) by at least 10° C., the component ratio by weight of the polyethylene-based resin (A) to the high-melting point resin (B) being in the range of 50/50 to 10/90, and the polyethylene-based resin (A) forming at least part of the surface of the fiber longitudinally continuously wherein the polyethylene-based resin (A) is characterized by a Co-monomer Distribution Constant greater than about 45, a recrystallization temperature between 85° C. and 110° C., a tan delta value at 0.1 rad/sec from about 15 to 50, and a complex viscosity at 0.1 rad/second of 1400 Pa.sec or less, and a reaction producing the polyethylene-based resin (A) being initiated with a mixture of peroxides and the chain transfer agent being a mixture of methyl ethyl ketone and propylene.