Invention Grant
- Patent Title: Method for depolymerizing polyester and unsaturated polyester, and method for recovering polyester monomer using the depolymerization
- Patent Title (中): 聚酯和不饱和聚酯的解聚方法以及使用解聚反应来回收聚酯单体的方法
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Application No.: US12096458Application Date: 2006-09-29
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Publication No.: US07897651B2Publication Date: 2011-03-01
- Inventor: Kazutoshi Ikenaga
- Applicant: Kazutoshi Ikenaga
- Agency: The Webb Law Firm
- Priority: JP2005-355701 20051209; JP2006-104823 20060406
- International Application: PCT/JP2006/319534 WO 20060929
- International Announcement: WO2007/066446 WO 20070614
- Main IPC: C08J11/10
- IPC: C08J11/10 ; C08J11/00 ; C08J11/04 ; C08J11/22 ; C08J11/28 ; C08F2/46 ; C08F2/24
Abstract:
A method for rapidly depolymerizing a polyester and an unsaturated polyester by irradiating the polyester with microwaves in the presence of an alkylene glycol in which a titanium oxide fine powder having a bulk density of not more than 0.3 g/cm3 has 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 an alkaline earth metal. As a result, raw materials of a polyester, an unsaturated polyester or a polyurethane, such as an alkylene glycol and an unsaturated dibasic acid, can be recovered efficiently.
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