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US 3,939,111 AGranted
Stable polyurethane solutions
AssigneeThe B. F. Goodrich Company
InventorsCharles S. Schollenberger, Kornelius Dinbergs
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Abstract
Viscosity stable polyurethane solutions in polar solvents as N,N-dimethylformamide are obtained when such solutions contain small amounts of ammonium salts of strong acids, such salts include ammonium chloride and nitrate.
Claims7
A solution of polyurethane in a solvent having the general formula ##EQU4## wherein the R's are hydrogen or alkyl containing a viscosity stabilizing amount of about 0.01 to about 2% of an ammonium salt of an inorganic acid selected from the group consisting of ammonium chloride, ammonium nitrate, and ammonium sulfate.
Dependencies are inferred from the claim text.