Process for the polymerization of cyclic ethers
AssigneeE. I. Du Pont de Nemours and Company
InventorsNeville Everton Drysdale, Lin Wang, Zhen-Yu Yang
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Abstract
An improved process for the polymerization of cyclic ethers to polyethers using strong Bronsted acid catalysts is disclosed. The catalysts are fluorinated sulfonic acid containing polymers. The resulting polyethers are useful as monomers and in adhesives.
Claims19
A process for polymerizing a cyclic ether in the presence of a strong Bronsted acid catalyst, which comprises polymerizing a cyclic ether in the presence of a fluorinated sulfonic acid-containing polymer as the strong Bronsted acid containing at least about 0.05 equivalents of fluorinated sulfonic acid group per kg of said fluorinated sulfonic acid containing polymer;
- containing more hydrogen atoms bound to carbon than fluorine atoms bound to carbon;
- and said fluorinated sulfonic acid is contained within the grouping --CR.sup.1 R.sup.2 CR.sup.3 R.sup.4 SO.sub.3 H wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each independently fluorine or perfluoroalkyl.
Dependencies are inferred from the claim text.