Polymerization of, and depolymerization to, cyclic ethers using

Details Polymerization of, and depolymerization to, cyclic ethers using Polymerization of, and depolymerization to, cyclic ethers using

1996-12-09

1998-06-23

Nagumo, Mark

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

528234, 528235, 528236, 528237, 528238, 528409, 528410, 528411, 528412, 528413, 528414, 528416, 528365, C08G 400, C08G 6520, C08G 6526, C08G 6516

Patent

active

057706786

ABSTRACT:
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.

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