Nonwoven fabric and textile product

Abstract

The nonwoven fabric has excellent secondary fabrication properties, specially, low temperature heat-sealing properties. The textile product is formed by using the nonwoven fabric. More specifically, the nonwoven fabric includes one or more layers, wherein the nonwoven fabric made of one layer, or at least one layer of the nonwoven fabric composed of two layers, or at least one layer of the two outermost layers of the nonwoven fabric of multi-layer consisting of three or more layers is formed by using a crystalline resin composition containing 1 to 99% by mass of a low crystalline olefin polymer satisfying the following expression (a): ΔH≧6×(Tm−140° C.) wherein ΔH represents a melt endotherm, and Tm represents a melting point.

1 . A nonwoven fabric comprising one or more layers, wherein
 at least one of the layers comprises a crystalline resin composition comprising 1 to 99% by mass of a low crystalline olefin polymer satisfying expression (a):
   Δ H≧ 6×( Tm− 140° C.)  (a)
 
   wherein ΔH represents a melt endotherm, and Tm represents a melting point, and   if the nonwoven fabric comprises three or more layers, then at least one of two outermost layers comprises the crystalline resin composition.   
     
     
         2 . A nonwoven fabric comprising one or more layers, wherein
 at least one of the layers comprises a core sheath composite fiber comprising a crystalline resin composition as a sheath component, wherein an amount of the sheath component is 1 to 99% by mass based on a total amount of a core component and the sheath component, and the crystalline resin composition comprises 1 to 99% by mass of a low crystalline olefin polymer satisfying expression (a):
   Δ H≧ 6×( Tm− 140° C.)  (a)
 
   wherein ΔH represents a melt endotherm, and Tm represents a melting point, and   if the nonwoven fabric comprises three or more layers, then an outermost layer comprises the core-sheath composite fiber.   
     
     
         3 . The nonwoven fabric of  claim 2 , wherein the amount of the sheath component is 1 to 49% by mass based on the total amount of the core component and the sheath component. 
     
     
         4 . The nonwoven fabric of  claim 1 , wherein the nonwoven fabric comprises three or more layers, and a ratio of the outermost layer comprising the crystalline resin composition to all the layers is 1 to 99% based on areal weight. 
     
     
         5 . The nonwoven fabric of  claim 4 , wherein the ratio of the outermost layer comprising the crystalline resin composition to all the layers is 1 to 60% based on areal weight. 
     
     
         6 . The nonwoven fabric of  claim 1 , wherein the crystalline resin composition comprises 1 to 49% by mass of the low crystalline olefin polymer. 
     
     
         7 . The nonwoven fabric of  claim 1 , wherein the low crystalline olefin polymer is a polypropylene polymer. 
     
     
         8 . The nonwoven fabric of  claim 1 , wherein the low crystalline olefin polymer is a low crystalline polypropylene polymer satisfying expressions (d) to (i):
   [ mmmm]= 20 to 60% by mol  (d)
     [ rrrr ]/(1−[ mmmm ])≦0.1  (e)
     [ rmrm]> 2.5% by mol  (f)
     [ mm]×[rr]/[mr]   2 ≦2.0  (g)
     weight-average molecular weight ( Mw )=10,000 to 200,000, and  (h)
     molecular weight distribution ( Mw/Mn )<4,  (i)
   
       wherein [mmmm] represents a mesopentad fraction, [rrrr] represents a racemic pentad fraction, [rmrm] represents a racemic-meso-racemic-meso pentad fraction, [mm] represents a mesotriad fraction, [rr] represents a racemic triad fraction, and [mr] represents a meso-racemic triad fraction. 
     
     
         9 . A textile product comprising the nonwoven fabric of  claim 1 . 
     
     
         10 . The nonwoven fabric of  claim 2 , wherein the nonwoven fabric comprises three or more layers, and a ratio of the outermost layer comprising the crystalline resin composition to all the layers is 1 to 99% based on areal weight. 
     
     
         11 . The nonwoven fabric of  claim 10 , wherein the ratio of the outermost layer comprising the crystalline resin composition to all the layers is 1 to 60% based on areal weight. 
     
     
         12 . The nonwoven fabric of  claim 2 , wherein the crystalline resin composition comprises 1 to 49% by mass of the low crystalline olefin polymer. 
     
     
         13 . The nonwoven fabric of  claim 2 , wherein the low crystalline olefin polymer is a polypropylene polymer. 
     
     
         14 . The nonwoven fabric of  claim 2 , wherein the low crystalline olefin polymer is a low crystalline polypropylene polymer satisfying expressions (d) to (i):
   [ mmmm]= 20 to 60% by mol  (d)
     [ rrrr ]/(1−[ mmmm ])≦0.1  (e)
     [ rmrm]> 2.5% by mol  (f)
     [ mm]×[rr]/[mr]   2 ≦2.0  (g)
     weight-average molecular weight ( Mw )=10,000 to 200,000, and  (h)
     molecular weight distribution ( Mw/Mn )<4,  (i)
   
       wherein [mmmm] represents a mesopentad fraction, [rrrr] represents a racemic pentad fraction, [rmrm] represents a racemic-meso-racemic-meso pentad fraction, [mm] represents a mesotriad fraction, [rr] represents a racemic triad fraction, and [mr] represents a meso-racemic triad fraction.