公开(公告)号：US5770678A

公开(公告)日：1998-06-23

申请号：US762813

申请日：1996-12-09

申请人： Neville Everton Drysdale ,  Richard Edmund Bockrath ,  Norman Herron ,  Joel David Citron

发明人： Neville Everton Drysdale ,  Richard Edmund Bockrath ,  Norman Herron ,  Joel David Citron

IPC分类号： C07D307/06 ,  C07D307/08 ,  C07F7/00 ,  C07F17/00 ,  C08G63/42 ,  C08G63/58 ,  C08G63/685 ,  C08G65/16 ,  C08G65/18 ,  C08G65/20 ,  C08G65/26 ,  C08G65/32 ,  C08G65/321 ,  C08G65/323 ,  C08G65/337 ,  C08G4/00

CPC分类号： C07D307/08 ,  C07D307/06 ,  C07F17/00 ,  C07F7/006 ,  C08G63/42 ,  C08G63/58 ,  C08G63/6856 ,  C08G65/16 ,  C08G65/18 ,  C08G65/20 ,  C08G65/2645 ,  C08G65/2648 ,  C08G65/266 ,  C08G65/32 ,  C08G65/321 ,  C08G65/323 ,  C08G65/337

摘要： A process for polymerizing oxiranes, oxetanes, oxepanes, dioxolanes, trioxanes, and tetrahydrofurans to their respective polymers by contacting them with a selected metal compound is disclosed; and also a process for depolymerizing polytetrahydrofurans to monomeric tetrahydrofurans by contacting the polymer with a selected metal compound at a temperature of about 100.degree. C. to about 250.degree. C. The catalysts may be in solution or part of a heterogeneous solid, and selected organic compounds are used as accelerators in the polymerizations. The polymeric products, some of which are novel, may be used as polyether monomers for further polymerization, as by reaction with isocyanates to produce polyurethanes, and other useful polymers. Some of the polymeric products are relatively high in molecular weight and are suitable for direct use, for instance as spandex fibers.