| abstract |
A method of preparing viscosity-stabilized toluene diisocyanate distillation residues comprising contacting toluene diisocyanate distillation residue with a material suitable for purging chloride-containing vapors under reaction conditions suitable to remove chloride-containing vapors from the toluene diisocyanate distillation residues. The material may be, for example, an aromatic solvent and/or a gas which associates, physically, chemically, or a combination thereof, with the vapors but not with significant amount of other components that may be present in the toluene diisocyanate distillation residue. The viscosity-stabilized and reactive residue can then be used alone or blended with one or more other isocyanate products, such as polymeric methylene diphenylisocyanate, to prepare materials such as polyurethane, polyisocyanurate, polyurethane-polyurea or polyurea compositions including, for example, foams. |