| 摘要 |
Provided is a method by which a polyester polyol can be produced by depolymerizing a starting material polyester within a short time without using a tin-based metal catalyst. A method for producing a polyester polyol, which is characterized by comprising a step wherein a starting material polyester is depolymerized by heating a mixture that contains, as essential ingredients, the starting material polyester, a polyol component, and a non-tin-based metal catalyst or a non-metal basic catalyst. It is preferable that the non-tin-based metal catalyst is a compound that is selected from the group consisting of zinc compounds, manganese compounds, lithium compounds and calcium compounds. |
