Leather-like sheet and method for manufacturing the same

Abstract

An object of the present invention is to provide a urethane resin composition for forming a skin layer of a leather-like sheet having a sufficient level of durability, including perspiration resistance and oil resistance, not to result in a poor appearance of the leather-like sheet or peeling of the skin layer from the support over time, for example, when perspiration or oil adheres thereto. The present invention is a leather-like sheet including a skin layer (C) formed from a urethane resin composition containing a urethane resin (A) having two or more hydroxyl groups on at least one end thereof and an aqueous medium (B); an adhesive layer (D); and a support layer (E).

1 . A leather-like sheet comprising:
 a skin layer (C) formed from a urethane resin composition containing a urethane resin (A) having two or more hydroxyl groups on at least one end thereof and an aqueous medium (B);   an adhesive layer (D); and   a support layer (E).   
     
     
         2 . The leather-like sheet according to  claim 1 , wherein the urethane resin (A) is prepared by reacting a polyol (a1) including a polycarbonate polyol, a polyisocyanate (a2), and optionally a chain extender (a3) to prepare a urethane prepolymer having an isocyanate group on each end thereof and then reacting the isocyanate group of the urethane prepolymer with an amino group of a polyalkanolamine. 
     
     
         3 . The leather-like sheet according to  claim 1 , wherein the adhesive layer (D) is formed from an adhesive (d) containing a compound (d-1) having hydroxyl groups and a compound (d-2) having isocyanate groups. 
     
     
         4 . The leather-like sheet according to  claim 3 , wherein some or all of the isocyanate groups of the compound (d-2) react with the hydroxyl groups of the urethane resin (A) contained in the skin layer (C) to form urethane bonds. 
     
     
         5 . A method for manufacturing a leather-like sheet comprising:
 applying and drying a urethane resin composition containing a urethane resin (A) having two or more hydroxyl groups on at least one end thereof and an aqueous medium (B) on a release paper;   applying the adhesive (d) to the surface to which the urethane resin composition is has been applied;   placing a support on the surface to which the adhesive (d) has been applied; and   then heating the adhesive (d).