| 摘要 |
<p>A method by which a polyester and an unsaturated polyester can be rapidly depolymerized with a simple apparatus. One embodiment of the depolymerization method comprises irradiating a polyester with microwaves in the presence of an alkylene glycol in which fine titanium oxide particles having a bulk density of 0.3 g/cm<SUP>3</SUP> or lower have been dispersed. Another embodiment comprises irradiating a polyester or an unsaturated polyester with microwaves in the presence of a monohydric alcohol or polyhydric alcohol containing an alkali metal and/or alkaline earth metal. By using this depolymerization method, raw materials for a polyester, unsaturated polyester, or polyurethane, such as alkylene glycols and unsaturated dibasic acids, can be efficiently recovered.</p> |
