Solvents for fluorinated polymers
AssigneeE. I. Du Pont de Nemours and Company
InventorWilliam H. Tuminello
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Abstract
Perfluorinated cycloalkanes, perfluorinated aromatic compounds and perfluorotrialkyl amines having a critical temperature greater than 150.degree. C. are solvents for certain carboxylic fluorinated polymers having an equivalent weight greater than 900 and dissolve the polymers more readily and completely at low temperatures than previously known solvents. A process for dissolution of the polymers and the solutions that are formed is disclosed. The solutions are useful for making polymer films and ion exchange membranes, particularly membranes for use in chloroalkali cells or fuel cells.
Claims5
A composition comprising a solution of a carboxylic fluorinated polymer having an equivalent weight of more than about 900 and containing tetrafluoroethylene units dissolved in a solvent which is selected from the group consisting of (i) a perfluorinated cycloalkane, (ii) perfluorinated aromatic compounds, or (iii) perfluorotrialkylamines;
- said solvent having a critical temperature of greater than about 150.degree. C.
Dependencies are inferred from the claim text.