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

Filed on

1995-04-19

Date issued

1997-06-03

Examiner

Delmendo, Romulo H.

Patent Class

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

SubClass

Synthetic resins

SubSubClass

From carboxylic acid or derivative thereof

Other Related Categories

528271, 528310, 528312, 528313, 528327, 528365, C08G 63685

Type

Patent

Status

active

Patent number

056355858

Description

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 of 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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