Thermoplastic resin fiber, production method therefor, and fabric thereof

Abstract

Disclosed herein is a thermoplastic resin fiber that uses highly versatile resin raw materials but exhibits high extensibility that is conventionally unknown. With a view to providing a method for producing the fiber and a fabric using the fiber, the thermoplastic resin fiber includes a thermoplastic resin containing a polyolefin resin, a polyamide resin, and a compatibilizer, and has a fracture elongation of 50% or more, wherein the compatibilizer is a modified elastomer having a reactive group that reacts with the polyamide resin. The fabric uses the thermoplastic resin fiber. The method includes a spinning step in which a thermoplastic resin composition obtained by melt-kneading a melt-kneaded product of the polyamide resin and the modified elastomer and the polyolefin is spun into a fiber.

1 . A thermoplastic resin fiber comprising a thermoplastic resin containing a polyolefin resin, a polyamide resin, and a compatibilizer, and having a fracture elongation of 50% or more, wherein
 the compatibilizer is a modified elastomer having a reactive group that reacts with the polyamide resin.   
     
     
         2 . The thermoplastic resin fiber according to  claim 1 , which has a breaking strength of 0.5 cN/dtex or more but 3.0 cN/dtex or less. 
     
     
         3 . The thermoplastic resin fiber according to  claim 1 , wherein when a breaking strength before drawing is defined as S 0  (cN/dtex) and a breaking strength after drawing is defined as S 1  (cN/dtex), the ratio between them (S 0 /S 1 ) is 0.3 or more but 1.15 or less. 
     
     
         4 . The thermoplastic resin fiber according to  claim 1 , wherein when a fiber diameter before drawing is defined as D 0  (mm) and a fiber diameter after drawing is defined as D 1  (mm), Do is larger than D 1 . 
     
     
         5 . The thermoplastic resin fiber according to  claim 1 , wherein the polyolefin resin forms a continuous phase (A), and
 the polyamide resin and the modified elastomer form a dispersed phase (B) dispersed in the continuous phase (A).   
     
     
         6 . The thermoplastic resin fiber according to  claim 5 , wherein the dispersed phase (B) has a fine dispersed phase (B 2 ) dispersed in the dispersed phase (B). 
     
     
         7 . A fabric comprising the thermoplastic resin fiber according to  claim 1 . 
     
     
         8 . A method for producing the thermoplastic resin fiber according to  claim 1 , the method comprising
 a spinning step in which a thermoplastic resin composition obtained by melt-kneading a melt-kneaded product of the polyamide resin and the modified elastomer and the polyolefin resin is spun into a fiber.