Artificial leather for automotive interior materials and method of manufacturing the same

Abstract

The present invention relates to an artificial leather for automotive interior materials and a method of manufacturing the same. More specifically, the artificial leather of the present invention is used in a covering process of automotive interior materials. According to the present invention, when the artificial leather of the present invention is used, transfer of the unevenness of an automotive interior material may be prevented, and wrinkling of the artificial leather may be prevented. In addition, the artificial leather of the present invention allows easy deployment of an airbag.

1 . An artificial leather for automotive interior materials, comprising a back layer ( 10 ), a pore layer ( 20 ), an adhesive layer ( 30 ), and a skin layer ( 40 ) laminated in order from bottom to top,
 wherein the back layer ( 10 ) comprises a circular knitted fabric, and   the artificial leather has an elongation of 80 to 180% in a length direction and an elongation of 110 to 290% in a width direction; has a tensile strength of 80 kgf/30 mm or less in a length direction and a tensile strength of 70 kgf/30 mm or less in a width direction; and is used in a covering process of automotive interior materials.   
     
     
         2 . The artificial leather according to  claim 1 , wherein the back layer ( 10 ) is a circular knitted fabric impregnated with polyurethane. 
     
     
         3 . The artificial leather according to  claim 1 , wherein the artificial leather has an elongation of 80 to 170% in a length direction and an elongation of 120 to 280% in a width direction. 
     
     
         4 . The artificial leather according to  claim 1 , wherein the artificial leather has a tensile strength of 70 kgf/30 mm or less in a length direction and a tensile strength of 60 kgf/30 mm or less in a width direction. 
     
     
         5 . The artificial leather according to  claim 1 , wherein a thickness ratio of the back layer ( 10 ) to the pore layer ( 20 ) is 1.5 to 3:1. 
     
     
         6 . The artificial leather according to  claim 1 , wherein a thickness ratio of the back layer ( 10 ) to the pore layer ( 20 ) is 0.5 to 1.5:1. 
     
     
         7 . The artificial leather according to  claim 1 , wherein the pore layer ( 20 ) is composed of a non-porous portion ( 21 ) positioned at a lower portion thereof and a porous portion ( 22 ) positioned at an upper portion thereof. 
     
     
         8 . The artificial leather according to  claim 7 , wherein an area of 70% or more of the pore layer ( 20 ) has a thickness ratio of the non-porous portion ( 21 ) to the porous portion ( 22 ) of 0.3 to 1.5:1. 
     
     
         9 . The artificial leather according to  claim 1 , wherein the artificial leather has a softness of 3.6 to 4.5. 
     
     
         10 . The artificial leather according to  claim 5 , wherein the artificial leather has a seam line on the back layer corresponding to a back thereof, and is used in a covering process of one or more automotive interior materials selected from the group consisting of a crash pad, a door trim, a console box, an armrest, a headrest, and a headliner. 
     
     
         11 . The artificial leather according to  claim 6 , wherein the artificial leather has no seam line on the back layer corresponding to a back thereof, and is used in a covering process of one or more automotive interior materials selected from the group consisting of a crash pad, a door trim, a console box, an armrest, a headrest, and a headliner. 
     
     
         12 . The artificial leather according to  claim 1 , wherein the artificial leather has a thickness of 0.85 to 1.5 mm. 
     
     
         13 . A method of manufacturing an artificial leather for automotive interior materials, the method comprising:
 back layer formation step S 1  of forming a back layer by impregnating a knitted fabric;   skin layer formation step S 1 ′ of forming a skin layer on an upper portion of a release paper;   pore layer formation step S 3  of forming a pore layer on an upper portion of the back layer;   adhesive layer formation step S 4  of forming an adhesive layer on an upper portion of the skin layer;   skin layer bonding step S 5  of bonding the skin layer on which the adhesive layer has been formed to an upper portion of the pore layer; and   release paper removal step S 7  of removing the release paper,   wherein the knitted fabric is a circular knitted fabric, and   the artificial leather has an elongation of 80 to 180% in a length direction and an elongation of 110 to 290% in a width direction; has a tensile strength of 80 kgf/30 mm or less in a length direction and a tensile strength of 70 kgf/30 mm or less in a width direction; and is used in a covering process of automotive interior materials.   
     
     
         14 . The method according to  claim 13 , wherein skin layer formation step S 1 ′ is a step of applying a skin layer composition onto an upper portion of a release paper and drying the release paper to form a skin layer,
 wherein the skin layer composition comprises 10 to 60 parts by weight of a solvent and 10 to 40 parts by weight of a pigment based on 100 parts by weight of a polyurethane resin. 
 
     
     
         15 . The method according to  claim 13 , wherein pore layer formation step S 3  is a step of applying a pore layer composition on an upper portion of a back layer, which is the impregnated knitted fabric, and then performing coagulation in an aqueous dimethylformamide solution and rinsing to form a pore layer,
 wherein the pore layer composition comprises 20 to 50 parts by weight of a solvent and 0.5 to 2 parts by weight of a pore control agent based on 100 parts by weight of a polyurethane resin.