PROBLEM TO BE SOLVED: To provide a functional fiber sufficiently utilizing photocatalyst functions of a metal oxide having a photocatalyst activity and having various functions such as deodorizing, antimicrobial, mildewproofing and anti-staining properties.
SOLUTION: The functional fiber is characterized as follows. The fiber has a multilayer structure comprising porous layers and dense layers alternately arranged and metal oxide fine particles having the photocatalyst activity are contained in the dense layers. The pore surface area of the fiber is preferably within the range of 10-40 m<SP>2</SP>/g and the metal oxide fine particles are preferably titanium oxide. The particle diameter of the metal oxide fine particles is preferably 10-100 nm.
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