Polyphenylene sulfide composite fiber and nonwoven fabric

Abstract

A polyphenylene sulfide composite fiber which consists primarily of component A and component B, the component A being a resin primarily containing polyphenylene sulfide made from p-phenylene sulfide as a primary unit, the component B being a resin primarily containing a copolymerized polyphenylene sulfide made from at least one kind of copolymerization unit other than p-phenylene sulfide, wherein at least one part of a fiber surface is made of component B. A thermally adhesive composite fiber and a nonwoven fabric which are made of a resin consisting primarily of polyphenylene sulfide and are excellent in heat resistance, flame retardancy and chemical resistance can be provided.

1 . A polyphenylene sulfide composite fiber consisting primarily of component A and component B, wherein the component A is a resin primarily containing polyphenylene sulfide made from p-phenylene sulfide as a primary unit while the component B is a resin primarily containing a copolymerized polyphenylene sulfide made from at least one kind of copolymerization unit other than p-phenylene sulfide, wherein at least one part of a fiber surface is made of the component B. 
     
     
         2 . The polyphenylene sulfide composite fiber according to  claim 1 , wherein the component A is a core component of a core-sheath type composite fiber while the component B is a sheath component thereof. 
     
     
         3 . The polyphenylene sulfide composite fiber according to  claim 1 , wherein the component B contains the copolymerized polyphenylene sulfide of which repeating unit has 70 to 97 mol % of p-phenylene sulfide and 3 to 30 mol % of m-phenylene sulfide. 
     
     
         4 . The polyphenylene sulfide composite fiber according to  claim 1 , wherein melting point Tm (A) of the component A and melting point Tm (B) of the component B satisfy the following formula:
   5[° C.]≦ Tm ( A )− Tm ( B )≦80[° C.],
   
     
     
         5 . A nonwoven fabric which has been made from the polyphenylene sulfide composite fiber according to  claim 1 . 
     
     
         6 . The nonwoven fabric according to  claim 5 , wherein the nonwoven fabric is a spunbonded nonwoven fabric. 
     
     
         7 . The nonwoven fabric according to  claim 5 , wherein the polyphenylene sulfide composite fiber has been integrated by a thermobonding. 
     
     
         8 . The nonwoven fabric according to  claim 5 , wherein a warp tensile strength retention rate in a heat exposure test at 180° C. for 1,300 hours is 80% or greater.