Coated Slag

Abstract

The invention relates to coated slag, which is coated with a layer of a hydrophobic polyurethane.

1 . A coated slag, which is coated with a layer of a hydrophobic polyurethane. 
     
     
         2 . The coated slag according to  claim 1 , wherein the layer of the polyurethane is not more than 5 mm thick. 
     
     
         3 . The coated slag according to  claim 1 , wherein the layer of the polyurethane is from 0.1 to 5 mm thick. 
     
     
         4 . The coated slag according to  claim 1 , wherein the particles of the slag are bound by the polyurethane to give a molding. 
     
     
         5 . The coated slag according to  claim 1 , wherein the preparation of the polyurethanes is effected by reacting polyisocyanates with compounds having at least two active hydrogen atoms. 
     
     
         6 . The coated slag according to  claim 5 , wherein the compounds having at least two active hydrogen atoms comprise at least one hydroxy-functional component known from fat chemistry. 
     
     
         7 . The coated slag according to  claim 5 , wherein the compounds having at least two active hydrogen atoms comprise at least one phenol-modified indene/cumarone resin. 
     
     
         8 . A process for the production of coated slag, wherein the slag is wetted with the liquid starting components of a hydrophobic polyurethane which cure on the surface of the slag. 
     
     
         9 . The process according to  claim 8 , wherein the wetting of the slag with the liquid starting components of the hydrophobic polyurethane is effected by spraying. 
     
     
         10 . The process according to  claim 8 , wherein the wetting of the slag with the liquid starting components of the hydrophobic polyurethane is effected by pouring. 
     
     
         11 . The process according to  claim 8 , wherein the wetting of the slag with the liquid starting components of the hydrophobic polyurethane is effected in a mixer.