Polyamide-based fiber for artificial hair having exceptional dripping resistance upon combustion

Abstract

Polyamide-based fiber for artificial hair that is excellent in drip resistance, texture, and productivity is provided. According to the present invention, provided is fiber for artificial hair, including a resin composition containing: aliphatic polyamide; semi-aromatic polyamide with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid; and a bromine-based flame retardant.

The invention claimed is: 
     
       1. Fiber for artificial hair, comprising a resin composition containing: aliphatic polyamide (A); semi-aromatic polyamide (B) with a skeleton obtained by polycondensation of aliphatic diamine and aromatic dicarboxylic acid; and a bromine-based flame retardant (C), wherein the bromine-based flame retardant (C) is added in amount of 3 to 40 parts by mass based on a total of 100 parts by mass of an amount of the aliphatic polyamide (A) and an amount of the semi-aromatic polyamide (B); wherein the semi-aromatic polyamide (B) includes at least one selected from polyamide 6T, polyamide 9T, and polyamide 10T; and the aliphatic polyamide (A) and the semi-aromatic polyamide (B) are mixed at a ratio ranging from 50 parts by mass/50 parts by mass to 99 parts by mass/1 part by mass. 
     
     
       2. The fiber of  claim 1 , wherein the aliphatic polyamide (A) includes at least one selected from polyamide 6 and polyamide 66. 
     
     
       3. The fiber of  claim 1 , wherein the aliphatic polyamide (A) has a weight average molecular weight Mw from 65 thousand to 150 thousand. 
     
     
       4. The fiber of  claim 1 , wherein the bromine-based flame retardant (C) is at least one selected from the group consisting of a brominated phenol condensate, a brominated polystyrene-based flame retardant, a brominated benzyl acrylate-based flame retardant, a brominated epoxy-based flame retardant, a brominated phenoxy-based flame retardant, a brominated polycarbonate-based flame retardant, and a bromine-containing triazine-based compound. 
     
     
       5. The fiber of  claim 1 , wherein the bromine-based flame retardant (C) includes a compound structure represented by a chemical formula (1) below 
       
         
           
           
               
               
           
         
       
     
     
       6. The fiber of  claim 1 , wherein the bromine-based flame retardant (C) is added in an amount from 3 to 30 parts by mass based on a total of 100 parts by mass of an amount of the aliphatic polyamide (A) and an amount of the semi-aromatic polyamide (B). 
     
     
       7. The fiber of  claim 1 , further comprising an auxiliary flame retardant (D). 
     
     
       8. The fiber of  claim 7 , wherein the auxiliary flame retardant (D) is at least one selected from the group consisting of antimony trioxide, antimony tetroxide, antimony pentoxide, sodium antimonate, zinc borate, and zinc stannate. 
     
     
       9. The fiber of  claim 7 , wherein the auxiliary flame retardant (D) has an average particle size ranging from 1 to 10 μm. 
     
     
       10. The fiber of  claim 7 , wherein the auxiliary flame retardant (D) is added in an amount from 0.1 to 10 parts by mass based on a total of 100 parts by mass of an amount of the aliphatic polyamide (A) and an amount of the semi-aromatic polyamide (B). 
     
     
       11. The fiber of  claim 1 , further comprising organic microparticles (E). 
     
     
       12. The fiber of  claim 11 , wherein the organic microparticles (E) are at least one selected from crosslinked nitrile rubber, a crosslinked acrylic resin, crosslinked polyester, crosslinked polyamide particles, a crosslinked silicone resin, a crosslinked polystyrene resin, and a crosslinked polyethylene resin. 
     
     
       13. The fiber of  claim 11 , wherein the organic microparticles (E) are crosslinked nitrile rubber. 
     
     
       14. The fiber of  claim 11 , wherein the crosslinked nitrile rubber has an AN ratio ranging from 30 to 50 mass %. 
     
     
       15. The fiber of  claim 11 , wherein the organic microparticles (E) are added in an amount from 3 to 30 parts by mass based on a total of 100 parts by mass of an amount of the aliphatic polyamide (A) and an amount of the semi-aromatic polyamide (B).