JP2004169261A5 - - Google Patents

Claims (13)

It is a sea-island structure fiber composed of at least two kinds of organic polymers having different solubility, wherein the island component is composed of a hardly soluble polymer, the sea component is composed of an easily soluble polymer, and the number average diameter of the island domain is 1-150 nm. A polymer alloy fiber in which 60% or more of the area ratio of the domain is in the range of 1 to 150 nm in diameter.
Area of the island domains ratio: the area of the island domains as _{S i,} to the total sum and the total area _{(S 1 + S 2 + ···} S n). Further, the frequency (number) of island domains having the same area S is counted, and the product of the area and frequency divided by the total area is defined as the area ratio of the island domains. Polymer alloy fiber according to claim 1, wherein the area ratio of the island domains in the range of 30nm straight diameter difference is 60% or more.   The polymer alloy fiber according to claim 1 or 2, wherein the sea polymer has a melting point of -20 to + 20 ° C of the melting point of the island polymer.   The polymer alloy fiber according to any one of claims 1 to 3, wherein the sea polymer has a melt viscosity of 100 Pa · s or less.   The polymer alloy fiber according to any one of claims 1 to 4, wherein the sea polymer is an alkaline aqueous solution and / or a hot water-soluble polymer.   The polymer alloy fiber according to any one of claims 1 to 5, wherein the melting point of the island polymer and / or the sea polymer is 165 ° C or higher.   Worcester spot is 15% or less, The polymer alloy fiber of any one of Claims 1-6.   The polymer alloy fiber according to any one of claims 1 to 7, wherein the strength is 1 cN / dtex or more.   A composite fiber composed of a polymer alloy and another polymer, wherein the polymer alloy has a sea-island structure composed of at least two differently soluble organic polymers, where the island component is a hardly soluble polymer and the sea component is a readily soluble polymer. The polymer alloy fiber in which the number average diameter of the island domains is 1 to 150 nm, and 60% or more of the island domains are 1 to 150 nm in diameter The polymer alloy fiber according to claim 9, wherein the core component is a core / sheath composite fiber composed of a polymer alloy, or the core component is a core / sheath composite fiber composed of a polymer alloy.   A fiber product having at least a part of the polymer alloy fiber according to claim 1.   The fiber product according to claim 11, wherein the fiber product is a woven or knitted fabric, a felt or a non-woven fabric.   A method for producing a fiber product comprising nanofibers having a number average diameter of 1 to 150 nm, wherein a sea polymer is eluted from the polymer alloy fiber according to claim 1 or the fiber product according to claim 11 or 12.