Artificial leather, production method therefor, and artificial leather backing material

Abstract

An artificial leather is provided having excellent flame retardancy and moderate air permeability and a flexible texture, where the artificial leather feels like natural suede and has an elegant appearance, the artificial leather including a fiber entanglement including an ultrafine fiber having an average single fiber diameter of 0.1 μm or more and 10 μm or less, and an elastomer, in which one surface is a napped surface having a raised nap, the other surface is a flame retardant surface having a flame retardant, and the following requirements 1 and 2 are satisfied: requirement 1: at least the flame retardant surface has a plurality of opening portions; requirement 2: the flame retardant has a tackiness of 0.1 N/cm 2 or more and 2.0 N/cm 2 or less.

1 . An artificial leather comprising:
 a fiber entanglement including an ultrafine fiber having an average single fiber diameter of 0.1 μm or more and 10 μm or less; and   an elastomer,   wherein one surface is a napped surface having a raised nap, the other surface is a flame retardant surface having a flame retardant, and the following requirements 1 and 2 are satisfied:   requirement 1: at least the flame retardant surface has a plurality of opening portions, and   requirement 2: the flame retardant has a tackiness of 0.1 N/cm 2  or more and 2.0 N/cm 2  or less.   
     
     
         2 . The artificial leather according to  claim 1 , wherein an opening ratio of the flame retardant surface is 1% or more and 40% or less. 
     
     
         3 . The artificial leather according to  claim 1 , wherein the artificial leather has a plurality of opening portions in each of the napped surface and the flame retardant surface, and at least some of the opening portions are through opening portions formed to penetrate from the napped surface to the flame retardant surface. 
     
     
         4 . The artificial leather according to  claim 1 , wherein the fiber entanglement is formed by integrating a fiber entanglement including the ultrafine fiber and a woven/knitted fabric (a). 
     
     
         5 . The artificial leather according to  claim 1 , wherein the flame retardant surface is a surface formed by stacking a woven/knitted fabric (b). 
     
     
         6 . The artificial leather according to  claim 1 , wherein a presence ratio of the flame retardant in a thickness direction satisfies the following formula:
   0.001≤ W/W   0 ≤0.7
   wherein W is a thickness (mm) from the flame retardant surface where the flame retardant is present, and W 0  is a thickness (mm) of the entire artificial leather.   
     
     
         7 . The artificial leather according to  claim 1 , wherein the flame retardant contains a phosphorus-based compound. 
     
     
         8 . The artificial leather according to  claim 1 , wherein the fiber entanglement including the elastomer has a density of 0.20 g/cm 3  or more and 0.50 g/cm 3  or less. 
     
     
         9 . A production method for the artificial leather according to  claim 1 , comprising:
 applying a flame retardant having a tackiness of 0.1 N/cm 2  or more and 2.0 N/cm 2  or less to one surface of a napped sheet-shaped article including a fiber entanglement including ultrafine fibers having an average single fiber diameter of 0.1 μm or more and 10 μm or less and an elastomer to form a flame retardant surface; and   providing a plurality of opening portions on at least the flame retardant surface.   
     
     
         10 . An artificial leather or a backing material of the artificial leather comprising:
 a fiber entanglement including an ultrafine fiber having an average single fiber diameter of 0.1 μm or more and 10 μm or less; and   an elastomer,   wherein one surface is a napped surface having a raised nap, the other surface is a functional surface having a functional agent, and the functional agent has a tackiness of 0.1 N/cm 2  or more and 2.0 N/cm 2  or less.   
     
     
         11 . An artificial leather or a backing material of the artificial leather comprising:
 a fiber entanglement including an ultrafine fiber having an average single fiber diameter of 0.1 μm or more and 10 μm or less; and   an elastomer,   wherein one surface is a napped surface having a raised nap, the other surface is a functional surface having a functional agent, the functional surface has a Kinetic friction coefficient of 0.15 or more and 0.60 or less, and the artificial leather or the backing material of the artificial leather has a stiffness of 30 mm or more and 150 mm or less.   
     
     
         12 . An artificial leather or a backing material of the artificial leather comprising:
 a fiber entanglement including an ultrafine fiber having an average single fiber diameter of 0.1 μm or more and 10 μm or less; and   an elastomer,   wherein one surface is a napped surface having a raised nap, the other surface is a functional surface having a functional agent, and an adhesion amount of the functional agent is 2 to 30% by mass with respect to the artificial leather or the backing material of the artificial leather.