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US 5,328,946 AGranted
Solvents for tetrafluoroethylene polymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsWilliam H. Tuminello, Robert J. Cavanaugh
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Abstract
Perfluorinated cycloalkane solvents for dissolving high melting polymers containing tetrafluoroethylene, are disclosed. These solvents dissolve such polymers more rapidly, and/or are more stable, than previously known solvents. Also disclosed is a process for dissolution of the polymers and their resulting solutions. The solutions are useful for making polymer films, coatings and for encapsulating objects.
Claims13
A composition, comprising, a solution of a polymer containing tetrafluoroethylene units dissolved in a solvent which is a perfluorinated cycloalkane provided that:
- said solvent may be substituted with one or more perfluoroalkyl and perfluoroalkylene groups, but the total number of carbon atoms in said perfluoroalkyl and perfluoroalkylene groups is less than the total number of ring carbon atoms in said solvent;
- the critical temperature of said solvent is above 340.degree. C.;
- and
- the melting point of said polymer is about 250.degree. C. or more.
1 more element
Dependencies are inferred from the claim text.