Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1992-08-28
1994-03-01
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524236, 524288, 524366, C08K 517, C08K 502
Patent
active
052908461
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.
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Article "Solubility Characteristics of Perfluorinated Polymers with Sulfonyl Fluoride Functionality" by G. H. McCain and M. J. Covitch, J. Electrochem. Soc.: Electrochemical Science and Technology (Jun. 1984) pp. 1350-1352.
E. I. Du Pont de Nemours and Company
Levitt Cary A.
Schofer Joseph L.
Smith Jeffrey T.
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