JP2005133250A5 - - Google Patents

Claims (9)

  The sheath component is a core-sheath composite fiber composed of a polymer alloy, and the polymer alloy part forms a sea-island structure in which the hardly soluble polymer is the sea and the easily soluble polymer is the island, and the island has a diameter of 200 nm or more occupying the entire island. A core-sheath composite fiber having an area ratio of 3% or less. The core-sheath conjugate fiber according to claim 1, wherein the average diameter of the island of the polymer alloy part of the sheath component is 1 to 100 nm.   The core-sheath conjugate fiber according to claim 1 or 2, wherein the easily soluble polymer of the polymer alloy part is an alkali easily soluble polymer.   The core-sheath conjugate fiber according to any one of claims 1 to 3, wherein Worcester spots are 0.1 to 5%. The core-sheath composite fiber according to any one of claims 1 to 4, wherein the core component is polyamide. The core-sheath composite fiber according to any one of claims 1 to 4, wherein the core component is polyester. The core-sheath composite fiber according to any one of claims 1 to 4, wherein the core component is a polyolefin. The core-sheath composite fiber according to any one of claims 1 to 7, wherein the sea polymer of the core component polymer and the sheath component polymer alloy part are of the same type. A fiber product having at least a part of the core-sheath conjugate fiber according to any one of claims 1 to 8 .