Fibers for artificial hair, fiber bundle for artificial hair, and hair decoration product

Abstract

A fiber for artificial hair, the fiber containing a vinyl chloride polymer and an aromatic vinyl polymer, the fiber having a heat shrinkage rate at 100° C. of 7% or more. A fiber bundle for artificial hair having the fiber for artificial hair. A hair decoration product having the fiber bundle for artificial hair.

1 . A fiber for artificial hair, the fiber comprising a vinyl chloride polymer and an aromatic vinyl polymer,
 the fiber having a heat shrinkage rate at 100° C. of 7% or more.   
     
     
         2 . The fiber for artificial hair according to  claim 1 , wherein the heat shrinkage rate is 7 to 25%. 
     
     
         3 . The fiber for artificial hair according to  claim 1 ,
 wherein a content of the vinyl chloride polymer is 60 to 95% by mass, and   a content of the aromatic vinyl polymer is 5 to 40% by mass.   
     
     
         4 . The fiber for artificial hair according to  claim 1 , wherein the aromatic vinyl polymer has a styrene-based compound and (meth)acrylonitrile as monomer units. 
     
     
         5 . The fiber for artificial hair according to  claim 4 , wherein the styrene-based compound includes styrene. 
     
     
         6 . The fiber for artificial hair according to  claim 4 , wherein a proportion of the monomer unit of the styrene-based compound is 74 to 88% by mass and a proportion of the monomer unit of the (meth)acrylonitrile is 12 to 26% by mass on the basis of the entire aromatic vinyl polymer. 
     
     
         7 . A fiber bundle for artificial hair, comprising the fiber for artificial hair according to  claim 1 . 
     
     
         8 . The fiber bundle for artificial hair according to  claim 7 , further comprising a fiber different from the fiber for artificial hair. 
     
     
         9 . A hair decoration product comprising the fiber bundle for artificial hair according to  claim 7 . 
     
     
         10 . The fiber for artificial hair according to  claim 1 , wherein the heat shrinkage rate is 11% or more. 
     
     
         11 . The fiber for artificial hair according to  claim 1 , wherein the heat shrinkage rate is 20% or more. 
     
     
         12 . The fiber for artificial hair according to  claim 1 ,
 wherein the aromatic vinyl polymer has a styrene-based compound as a monomer unit, and   a proportion of the monomer unit of the styrene-based compound is more than 70% by mass on the basis of the entire aromatic vinyl polymer.   
     
     
         13 . The fiber for artificial hair according to  claim 1 ,
 wherein the aromatic vinyl polymer has a styrene-based compound as a monomer unit, and   a proportion of the monomer unit of the styrene-based compound is more than 85% by mass on the basis of the entire aromatic vinyl polymer.   
     
     
         14 . The fiber for artificial hair according to  claim 1 ,
 wherein the aromatic vinyl polymer has a (meth)acrylonitrile as a monomer unit, and   a proportion of the monomer unit of the (meth)acrylonitrile is less than 15% by mass on the basis of the entire aromatic vinyl polymer.   
     
     
         15 . The fiber for artificial hair according to  claim 1 ,
 wherein the aromatic vinyl polymer has a (meth)acrylonitrile as a monomer unit, and   a proportion of the monomer unit of the (meth)acrylonitrile is more than 25% by mass on the basis of the entire aromatic vinyl polymer.   
     
     
         16 . The fiber for artificial hair according to  claim 4 ,
 wherein a total amount of the monomer unit of the styrene-based compound and the monomer unit of the (meth)acrylonitrile is 90% by mass or more on the basis of the entire aromatic vinyl polymer.   
     
     
         17 . The fiber for artificial hair according to  claim 4 ,
 wherein a total amount of the monomer unit of the styrene-based compound and the monomer unit of the (meth)acrylonitrile is 99% by mass or more on the basis of the entire aromatic vinyl polymer.