| 摘要 |
<p>Decomposiing polyurethane foams by treating such polyurethane materials with ammonia or ammonium hydroxide, preferably in the presence of a suitable organic solvent such as a glycol or polyol, or the decomposition product of a polyurethane. Treatment of the polyurethane material with ammonia or ammonium hydroxide, particularly in combination with such solvent, is carried out preferably at elevated temperature, and results in decomposition of the polyurethane. The resulting reaction product containing polyol fragments from such decomposition or depolymerization, can be incorporated with fresh polyurethane reactants, including polyisocyanate, or polyol and polyisocyanate, to produce new urethane polymer, thus permitting recovery and re-use of otherwise useless scrap polyurethane materials.</p> |
