Spunbonded nonwoven fabric

Abstract

A spunbonded nonwoven fabric of the present invention is characterized by being composed of a polyolefin fiber, wherein the average pore diameter of the nonwoven fabric surface is 0.1-25 μm, the maximum pore diameter is 50 μm or less, and the water pressure resistance per unit basis weight is 7 mmH 2 O/(g/m 2 ) or more.

1 . A spun-bonded nonwoven fabric composed of polyolefin fibers, wherein a surface of the nonwoven fabric has an average pore diameter of 0.1 to 25 μm, and a maximum pore diameter of 50 pm or less, and the nonwoven fabric has water pressure resistance per unit basis weight of 7 mmH 2 O/(g/m 2 ) or more. 
     
     
         2 . The spun-bonded nonwoven fabric according to  claim 1 , wherein the fiber constituting the nonwoven fabric has an average single fiber diameter of 6.5 to 11.9 μm. 
     
     
         3 . The spun-bonded nonwoven fabric according to  claim 1 , wherein a kinetic friction coefficient between the fibers constituting the nonwoven fabric is 0.01 to 0.3. 
     
     
         4 . The spun-bonded nonwoven fabric according to  claim 1 , wherein the fiber constituting the nonwoven fabric has an MFR of 155 to 850 g/10 min. 
     
     
         5 . The spun-bonded nonwoven fabric according to  claim 1 , wherein the fiber constituting the nonwoven fabric comprises a fatty acid amide compound having 23 or more and 50 or less carbon atoms. 
     
     
         6 . The spun-bonded nonwoven fabric according to  claim 5 , wherein an addition amount of the fatty acid amide compound is 0.01% to 5.0% by mass. 
     
     
         7 . The spun-bonded nonwoven fabric according to  claim 5 , wherein the fatty acid amide compound is ethylene bisstearic acid amide. 
     
     
         8 . The spun-bonded nonwoven fabric according to  claim 6 , wherein the fatty acid amide compound is ethylene bisstearic acid amide. 
     
     
         9 . The spun-bonded nonwoven fabric according to  claim 2 , wherein the fiber constituting the nonwoven fabric comprises a fatty acid amide compound having 23 or more and 50 or less carbon atoms. 
     
     
         10 . The spun-bonded nonwoven fabric according to  claim 9 , wherein an addition amount of the fatty acid amide compound is 0.01% to 5.0% by mass. 
     
     
         11 . The spun-bonded nonwoven fabric according to  claim 9 , wherein the fatty acid amide compound is ethylene bisstearic acid amide. 
     
     
         12 . The spun-bonded nonwoven fabric according to  claim 10 , wherein the fatty acid amide compound is ethylene bisstearic acid amide.