Artificial leather substrate, grain-like-finish artificial leather, method for producing artificial leather substrate, and modifying agent for artificial leather substrate

Abstract

Provided is an artificial leather substrate including: an entangled fiber body; a filler and a non-volatile oil in liquid form added into the entangled fiber body by impregnation; and preferably, an elastic polymer. Preferably, the content of the non-volatile oil is 0.5 to 10 mass % relative to the entangled fiber body. Further preferably, the artificial leather substrate further includes a smoothing layer for smoothing the substrate surface, the smoothing layer being a layer including a second elastic polymer and a second filler and having a thickness of 10 to 100 μm.

1 . An artificial leather substrate comprising:
 an entangled fiber body; and   a first filler and a non-volatile oil in liquid form, both added into the entangled fiber body by impregnation.   
     
     
         2 . The artificial leather substrate in accordance with  claim 1 , wherein the first filler includes at least one of an inorganic filler and an organic filler. 
     
     
         3 . The artificial leather substrate in accordance with  claim 1 , wherein the non-volatile oil includes at least one selected from liquid paraffin, silicone oil, mineral oil, and phthalate esters. 
     
     
         4 . The artificial leather substrate in accordance with  claim 1 , wherein the entangled fiber body is a non-woven fabric of ultrafine fibers with a fineness of 0.9 dtex or less. 
     
     
         5 . The artificial leather substrate in accordance with  claim 1 , wherein a content of the first filler relative to the entangled fiber body is 1 to 60 mass %. 
     
     
         6 . The artificial leather substrate in accordance with  claim 1 , wherein a content of the non-volatile oil relative to the entangled fiber body is 0.5 to 10 mass %. 
     
     
         7 . The artificial leather substrate in accordance with  claim 1 , wherein 0 to 15 mass % of a first elastic polymer relative to the entangled fiber body, are further added by impregnation. 
     
     
         8 . The artificial leather substrate in accordance with  claim 7 , wherein a content of the first filler, the non-volatile oil, and the first elastic polymer in total, relative to the entangled fiber body, is 10 to 30 mass %. 
     
     
         9 . The artificial leather substrate in accordance with  claim 7 , wherein a content of the non-volatile oil in a total amount of the first filler, the non-volatile oil, and the first elastic polymer, is 3 to 70 mass %. 
     
     
         10 . The artificial leather substrate in accordance with  claim 9 , wherein a content of the first filler in the total amount of the first filler, the non-volatile oil, and the first elastic polymer, is 30 to 97 mass %. 
     
     
         11 . The artificial leather substrate in accordance with  claim 10 , wherein a content of the first elastic polymer in the total amount of the first filler, the non-volatile oil, and the first elastic polymer, is 1 to 20 mass %. 
     
     
         12 . The artificial leather substrate in accordance with  claim 1  having an apparent density of 0.60 g/cm 3  or more. 
     
     
         13 . The artificial leather substrate in accordance with  claim 1  further comprising a smoothing layer for smoothing a surface,
 the smoothing layer being a layer including a second elastic polymer and a second filler and having a thickness of 10 to 100 μm. 
 
     
     
         14 . The artificial leather substrate in accordance with  claim 13 , wherein the smoothing layer includes 1 to 50 mass % of the second filler. 
     
     
         15 . The artificial leather substrate in accordance with  claim 13 , wherein a surface water absorption rate in compliance with the water drop method of JIS L1907-7.1.1 is 100 seconds or more. 
     
     
         16 . A grain-like-finish artificial leather formed by further stacking a resin layer on the smoothing layer in the artificial leather substrate in accordance with  claim 13 . 
     
     
         17 . The grain-like-finish artificial leather in accordance with  claim 16 , wherein a stiffness measured by a softness tester is 1.8 to 2.5 mm. 
     
     
         18 . A production method of artificial leather substrate, the method being for the artificial leather substrate in accordance with  claim 13  and comprising:
 a step of preparing an original fabric of the artificial leather substrate in accordance with  claim 1 ; and 
 a step of forming the smoothing layer with the thickness of 10 to 100 μm, by applying a smoothing-layer-forming coating liquid to a surface of the original fabric, followed by drying, 
 the smoothing-layer-forming coating liquid including the second elastic polymer and the second filler, as a solid content; and having a thixotropic index of 2 to 4, the thixotropic index being a ratio between a viscosity η 0.6  and a viscosity η 3.0  (η 0.6 /η 3.0 ), the viscosity η 0.6  measured at 0.6 rotation/sec and the viscosity η 3.0  measured at 3 rotations/sec by using a B-type rotational viscometer at a temperature of 25° C. 
 
     
     
         19 . The production method of artificial leather substrate in accordance with  claim 18 , wherein a solid content in the smoothing-layer-forming coating liquid includes 1 to 50 mass % of the second filler. 
     
     
         20 . A modifying agent for artificial leather substrate, the modifying agent comprising:
 3 to 90 mass of a non-volatile oil in liquid form as a non-volatile component; and   10 to 97 mass % of a formulation including: a first filler being at least one selected from an inorganic filler and an organic filler; and a first elastic polymer.