The disclosed subject matter relates to a superomniphobic fiber including a core having a surface and at least one channel and a plurality of nanoparticles disposed in the material core at least partially protruding from the surface of the material core.

Disclosed is a napped artificial leather napped including: a non-woven fabric that is an entangle body of ultrafine fibers; and an elastic polymer impregnated into the non-woven fabric, the napped artificial leather having, at least on one side thereof, a napped surface formed by napping the ultrafine fibers, wherein the ultrafine fibers contain 0.5 mass % or more of a pigment (A), the elastic polymer contains 0 to 0.01 mass % of a pigment (B), and the ultrafine fibers and the elastic polymer are undyed; the napped surface has a lightness L* value of 25 or less in a color coordinate space (L*a*b* color space); and a ratio of an area occupied by the elastic polymer, observed on the napped surface, to a total area of an area occupied by the ultrafine fibers and the area occupied by the elastic polymer is 0.5% or less.

Provided is a sea-island composite fiber having excellent spinnability and thermoplastic deformability. The sea-island composite fiber comprises an island component and a sea component having a lower melting point than that of the island component, wherein the fiber has an aspect ratio of from 2.0 to 5.0 in a fiber cross section; and the sea component has a sea component thickness of from 0.2 to 2.0 μm, the sea component thickness being defined as a distance between an outer periphery of the fiber and an island component closest to the outer periphery on a minor axis of the fiber cross section.

Provided is a sea-island composite fiber having excellent spinnability and thermoplastic deformability. The sea-island composite fiber comprises an island component and a sea component having a lower melting point than that of the island component, wherein the fiber has an aspect ratio of from 2.0 to 5.0 in a fiber cross section; and the sea component has a sea component thickness of from 0.2 to 2.0 μm, the sea component thickness being defined as a distance between an outer periphery of the fiber and an island component closest to the outer periphery on a minor axis of the fiber cross section.

A sea-island composite fiber includes island component fibers having a circumscribed circle diameter of 10 to 1000 nm, a circumscribed circle diameter variation of 1 to 20%, a non-circularity of 1.2 to 5.0, and a non-circularity variation of 1 to 10%.

A sea-island composite fiber includes island component fibers having a circumscribed circle diameter of 10 to 1000 nm, a circumscribed circle diameter variation of 1 to 20%, a non-circularity of 1.2 to 5.0, and a non-circularity variation of 1 to 10%.

A sheet material has good mechanical properties, flexibility, lightweight properties, and quality, and also relates to a production method therefor. The sheet material includes, as constitutional components, an elastic polymer and nonwoven fabric composed mainly of ultrafine hollow fiber with an average monofilament diameter in the range of 0.05 to 10 μm, the ultrafine hollow fiber containing 2 to 60 hollows.

A sheet material includes a polymeric elastomer and a fiber-entangled body including, as a constituent element, a nonwoven fabric including ultrafine fibers having an average single fiber diameter of 1.0 μm or more and 10.0 μm or less. The ultrafine fibers include a polyester-based resin including a black pigment (a.sub.1). The black pigment (a.sub.1) has an average particle diameter of 0.05 μm or more and 0.20 μm or less and has a coefficient of variation (CV) of the average particle diameter of 75% or less. The polymeric elastomer includes a polyurethane including a black pigment (b). The sheet material has a nap coverage of 70% or more and 100% or less on a surface having a nap.

A composite fusion filament is disclosed that includes a polymer encasement and one or more mesogenic reinforcement bodies contained within the polymer encasement. The polymer encasement is comprised of a thermoplastic polymer, which has a melting temperature, and each of the one or more mesogenic reinforcement bodies is comprised of a thermotropic liquid crystal polymer, which has a clearing temperature. The melting temperature of the thermoplastic polymer included in the polymer encasement is less than the clearing temperature of the thermotropic liquid crystal polymer included in the one or more mesogenic reinforcement bodies. Additionally, the thermotropic liquid crystal polymer of each mesogenic reinforcement body has a plurality of organized crystalline fibrils that are aligned lengthwise along a longitudinal axis of the polymer encasement. A method of using the composite fusion filament to form a bond with a substrate that includes a thermoplastic polymer is also disclosed.

Disclosed is a napped artificial leather including: an artificial leather base material that includes a non-woven fabric of polyester fibers having a Young's modulus of 1 to 6 GPa, an average fiber-toughness of 8 to 40 cN.Math.%, and a crystallinity of 35% or less, and an elastic polymer, the artificial leather base material having, on at least one surface thereof, a napped surface on which the polyester fibers are napped. Also disclosed are polyester fibers having a Young's modulus of 1 to 6 GPa, an average fiber-toughness of 8 to 40 cN.Math.%, and a crystallinity of 35% or less, and a non-woven fabric including the polyester fibers.