Heat-fusible composite fiber and non-woven fabric using same

Abstract

The purpose of the present invention is to provide a heat-fusible composite fiber that reduces the consumption of fossil resources and imparts both bulkiness and flexibility to non-woven fabrics, and a non-woven fabric using the heat-fusible composite fiber. Provided is a heat-fusible composite fiber in which a first component is configured from a polyester resin and a second component is configured from a polyethylene resin having a lower melting point than the first component, the mixing ratio (weight ratio) of a biomass-derived polyethylene resin and a fossil-resource-derived polyethylene resin in the polyethylene resin being 20:80 to 90:10.

1 . A heat-fusible composite fiber comprising:
 a first component configured from a polyester resin; and   a second component configured from a polyethylene resin having a lower melting point than that of the first component,   wherein a mixing ratio (weight ratio) of a biomass-derived polyethylene resin and a fossil-resource-derived polyethylene resin in the polyethylene resin is 20:80 to 90:10.   
     
     
         2 . The heat-fusible composite fiber according to  claim 1 , wherein a biomass-derived carbon content in the polyethylene resin is 20% to 90%. 
     
     
         3 . The heat-fusible composite fiber according to  claim 1 , wherein a biomass-derived carbon content in the heat-fusible composite fiber is 10% or more. 
     
     
         4 . The heat-fusible composite fiber according to  claim 1 , wherein a biomass-derived carbon content in the polyester resin is 30% or less. 
     
     
         5 . The heat-fusible composite fiber according to  claim 1 , wherein a fineness of the heat-fusible composite fiber is 2.2 dtex or less. 
     
     
         6 . The heat-fusible composite fiber according to  claim 1 , wherein a heat of fusion of the polyester resin in the heat-fusible composite fiber is 24 J/g or more. 
     
     
         7 . The heat-fusible composite fiber according to  claim 1 ,
 wherein the heat-fusible composite fiber is a sheath-core type heat-fusible composite fiber comprising:   the first component as a core component; and   the second component as a sheath component.   
     
     
         8 . The heat-fusible composite fiber according to  claim 1 , wherein the polyester resin is polyethylene terephthalate, and the polyethylene resin is high-density polyethylene. 
     
     
         9 . A non-woven fabric, comprising the heat-fusible composite fiber according to  claim 1 . 
     
     
         10 . An absorbent article, using the heat-fusible composite fiber according to  claim 1 .