Patent ID: 6515036
Filing Date: 2003-02-04
Classification: C08J,Y02W

Abstract:
A method of recovering a decomposition product from a polyurethane, the method comprising the steps of:thermally decomposing a polyurethane into a liquid containing a polyol and a urea compound which is soluble in the polyol, and solids containing a urea compound which is insoluble in the liquid, in the presence of a polyamine compound at a temperature of 120 to 250Â° C.; removing the solids; hydrolyzing the liquid with water at a temperature of 200 to 320Â° C. and under pressure sufficient to retain water in a liquid form, to form a mixture of a polyamine and a polyol; recovering the polyamine and/or polyol from the mixture; adding a polyamine compound to the removed solids to dissolve the solids in the polyamine compound; removing insolubles from the dissolved solids; hydrolyzing the dissolved solids with water at a temperature of 200 to 320Â° C. and under pressure sufficient to retain water in a liquid form, to form a polyamine; and recovering the polyamine.