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US 5,475,069 AGranted
Polymerization of vinyl ethers
AssigneeE. I. Du Pont de Nemours and Company
InventorNeville E. Drysdale
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Abstract
Process for the polymerization of selected vinyl ethers catalyzed by yttrium or rare earth metal perfluoroalkylsulfonates. A preferred perfluoroalkylsulfonate anion is triflate (trifluoromethanesulfonate). The resulting polymers are useful as tackifiers in adhesives as well as in other uses (e.g., plasticizers, viscosity modifiers).
Claims13
A process for the polymerization of vinyl ethers, comprising, contacting a yttrium or rare earth metal perfluoroalkylsulfonate with a vinyl ether of the formula CH.sub.2 .dbd.CHOR.sup.1 wherein R.sup.1 is hydrocarbyl or substituted hydrocarbyl, provided that:
- said yttrium or rare earth metal is trivalent;
- R.sup.1 has no more than one halogen atom alpha or beta to a vinyl ether oxygen atom;
- and
- said vinyl ether is in the liquid phase.
1 more element
Dependencies are inferred from the claim text.