Patent ID: 6489373
Filing Date: 2002-12-03
Classification: C08J,Y02P,Y02W

Abstract:
A method for decomposition of polyurethane resin from a product that contains a polyurethane resin member and a non-polyurethane resin member and recovery of decomposed products, which comprisesa step of treating the product with a solubilizing agent consisting essentially of polyamine compound at a temperature of 150 to 230Â° C. to dissolve polyurethane resin, a step of filtering insoluble material of the non-polyurethane resin member of the product from the resulting solution, a step of hydrolyzing the filtered solution with liquid water at a temperature of 250 to 300Â° C., in the absence of a catalyst, and under a pressure at which the heated water remains liquid, the filtered solution being fed continuously for hydrolyzing, and a step of recovering the polyamine compound and/or the polyol compound thus formed from the decomposition of the polyurethane, wherein the step of hydrolysis is conducted at a weight ratio of added water to the liquid to be hydrolyzed in the range of 0.3:1 to 5.0:1.