Sheet-shaped article and manufacturing method therefor

Abstract

A purpose of the present invention is to provide a sheet-shaped article and a manufacturing method therefor, said sheet-shaped article demonstrating both a supple texture and superior wear resistance. In order to achieve this purpose, a sheet-shaped article according to the present invention is a sheet-shaped article that includes, in a fibrous base material, a polymer elastic body with a hydrophilic group, said fibrous base material comprising extremely fine fibers with an average individual fiber fineness of 0.1 μm to 10 μm, wherein the sheet-shaped article has N-acylurea bonding or isourea bonding within the polymer elastic body, and a monovalent positive ion-including inorganic salt is present at a rate of 0.1 mass % to 5 mass % with regard to the mass of the polymer elastic body.

1 . A sheet-shaped article comprising a fibrous substrate including ultrafine fibers with an average individual fiber fineness of 0.1 μm or more and 10 μm or less, the fibrous substrate containing a hydrophilic group-having polymer elastic body,
 wherein an inside of the polymer elastic body has N-acylurea bonding and/or isourea bonding, and a monovalent positive ion-including inorganic salt is present at a rate of 0.1 mass % or more and 5 mass % or less, with regard to a mass of the polymer elastic body. 
 
     
     
         2 . The sheet-shaped article according to  claim 1 , wherein the monovalent positive ion-including inorganic salt is sodium chloride and/or sodium sulfate. 
     
     
         3 . The sheet-shaped article according to  claim 1 , wherein the polymer elastic body contains a polyether diol as a constituent. 
     
     
         4 . The sheet-shaped article according to  claim 1 , wherein the polymer elastic body includes a hydrophilic group-having polymer elastic body A containing a polyether diol as a constituent, and a hydrophilic group-having polymer elastic body B containing a polycarbonate diol as a constituent. 
     
     
         5 . The sheet-shaped article according to  claim 1 , wherein a bending resistance as specified in JIS L 1096: 2010 (a 45° cantilever method) is 50 mm or more and 180 mm or less, and an abrasion loss after 20,000 times of rubbing by a Martindale abrasion test as specified in JIS L 1096: 2010 is 10 mg or less. 
     
     
         6 . A method for manufacturing a sheet-shaped article, comprising:
 impregnating a fibrous substrate including ultrafine fibers with an average individual fiber fineness of 0.1 μm or more and 10 μm or less with an aqueous dispersion containing a hydrophilic group-having polymer elastic body, a monovalent positive ion-including inorganic salt, and a crosslinker; and   subjecting the fibrous substrate to a heat treatment at a temperature of 100° C. or more and 180° C. or less,   wherein a content of the monovalent positive ion-including inorganic salt in the aqueous dispersion is 10 mass % or more and 50 mass % or less with regard to a mass of a solid content of the hydrophilic group-having polymer elastic body.   
     
     
         7 . The method for manufacturing a sheet-shaped article according to  claim 6 , wherein the monovalent positive ion-including inorganic salt is sodium chloride and/or sodium sulfate. 
     
     
         8 . The method for manufacturing a sheet-shaped article according to  claim 6 , wherein the crosslinker is a carbodiimide-based crosslinker. 
     
     
         9 . The method for manufacturing a sheet-shaped article according to  claim 6 , wherein the hydrophilic group-having polymer elastic body contains a polyether diol as a constituent. 
     
     
         10 . The method for manufacturing a sheet-shaped article according to  claim 6 , wherein a hydrophilic group-having polymer elastic body X and a hydrophilic group-having polymer elastic body Y having compositions different from each other are contained in the aqueous dispersion, and the hydrophilic group-having polymer elastic body Y is coagulated after the hydrophilic group-having polymer elastic body X is coagulated.