| abstract |
The present invention relates to a method of producing artificial leather comprising a top coat, a polyurethane layer and an optional substrate layer, the method comprising i) providing a release layer, ii) top coating one or more layers a layer is applied to the release layer until the thickness of the total top coat is in the range of 1 μm to 500 μm, iii) the first polyurethane comprising the isocyanate component (A) and the polyol component (B) a system component is applied to the topcoat layer to form a first polyurethane layer, wherein the isocyanate index of the first polyurethane system component ranges from 101 to 140, iv) Whereas other polyurethane system components are applied to the first polyurethane layer to form additional polyurethane layers, v) substrate layers are optionally applied to the polyamines On the carbamate system component, vi) curing the polyurethane system components to form a polyurethane layer, and vii) separating the release layer from the topcoat, wherein The first and optionally other polyurethane layers have a total thickness in the range of from 0.01 mm to 20 mm and the polyurethane system components are free of solvent. The invention further relates to the use of artificial leather obtainable by such a method and the artificial leather as an upper material for footwear. |