Composite fiber, multifilament, woven article, and textile product

Abstract

A composite fiber is provided in which two types of segments A and B are present in a fiber transverse section, where the segment B has a cross-sectional area smaller than a cross-sectional area of the segment A, and is formed of two types of polymers combined in a side-by-side type or an eccentric core-sheath type; and where a multifilament is composed of two types of filaments A and B, in which one or more of the filaments B are present between any two of the filaments A in the multifilament; and where a woven or knitted fabric is subjected to water repellent finish and includes a multifilament composed of two types of filaments A and B, in which one or more of the filaments B are present between any two of the filaments A in the multifilament.

1 . A composite fiber in which two types of segments A and B are present in a fiber transverse section, wherein the segment B has a cross-sectional area smaller than a cross-sectional area of the segment A, and is formed of two types of polymers combined in a side-by-side type or an eccentric core-sheath type. 
     
     
         2 . The composite fiber according to  claim 1 , wherein three or more of the segments B are disposed on an outer periphery of the segment A in the fiber transverse section. 
     
     
         3 . The composite fiber according to  claim 1 , wherein a cross-sectional area S B  per segment B is 1 μm 2 ≤S B <65 μm 2  in the fiber transverse section. 
     
     
         4 . The composite fiber according to  claim 1 , wherein the composite fiber is a sea-island composite fiber including the segments A and B as island components, and a sea component is formed of a polymer having a highest dissolution rate in a solvent among polymers constituting the sea-island composite fiber. 
     
     
         5 . A multifilament obtained by dividing the segments A and B from the composite fiber according to  claim 1 . 
     
     
         6 . A fiber product at least partially comprising the multifilament according to  claim 5 . 
     
     
         7 . A multifilament composed of two types of filaments A and B, wherein one or more of the filaments B are present between any two of the filaments A in the multifilament, and the filament B has a smaller fiber diameter than a fiber diameter of the filament A and is formed of two types of polymers combined in a side-by-side type or an eccentric core-sheath type. 
     
     
         8 . The multifilament according to  claim 7 , wherein a fiber diameter D B  of the filament B is 1 μm≤D B <9 μm. 
     
     
         9 . A woven or knitted fabric at least partially comprising the multifilament according to  claim 7 . 
     
     
         10 . The woven or knitted fabric according to  claim 9 , wherein the woven or knitted fabric is subjected to water repellent finish. 
     
     
         11 . A woven or knitted fabric subjected to water repellent finish, comprising a multifilament composed of two types of filaments A and B, wherein one or more of the filaments B are present between any two of the filaments A in the multifilament, the filament B has a smaller fiber diameter than a fiber diameter of the filament A and is formed of two types of polymers combined in a side-by-side type or an eccentric core-sheath type, and a sliding angle of water drop is 1 to 20 degrees. 
     
     
         12 . The woven or knitted fabric according to  claim 11 , wherein a difference between the sliding angles of water drop before and after repeating washing in accordance with JIS L1930-2014-C4M method and drying in accordance with JIS L1930-2014-A method (line dry) 20 times is 0 to 20 degrees. 
     
     
         13 . The woven or knitted fabric according to  claim 11 , wherein a fluorine content in combustion-ion chromatography is 25 ng/g or less.