| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for purifying a polyurethane resin by which a high-purity purified polyol can be produced without requiring special treatment, in which the yield of distillation residue is excellent, and by which the reduction of a required energy can be achieved. <P>SOLUTION: The purified polyol is obtained by adding a decomposing agent comprising an amine compound and a derivative thereof in a molar ratio of 1/1.25 to 10/1 based on a urethane bond contained in the polyurethane resin to chemically decompose the polyurethane resin, separating the obtained polyurethane-decomposed product, and distilling a crude polyol layer which is the upper layer under a reduced pressure. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
