Purification of polyphosphazene polyacids
AssigneeVirus Research Institute
InventorsAlexander K. Andrianov, Mark P. LeGolvan, Yuri Svirkin, Sameer S. Sule
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Abstract
A method for purification of a polyphosphazene polyacid or acid salt thereof in which a polyphosphazene polyacid or acid salt thereof is dissolved in a concentrated aqueous solution of a salt of monovalent ions. The resulting aqueous solution of the polyphosphazene polyacid or acid salt thereof and the at least one salt of monovalent ions then is diluted to reduce the concentration of the at least one salt of monovalent ions, whereby the polyphosphazene polyacid or acid salt thereof is precipitated. The precipitated polyphosphazene polyacid or acid salt thereof then is recovered.
Claims10
A method for purification of a polyphosphazene polyacid or acid salt thereof, comprising:
- a. dissolving said polyphosphazene polyacid or acid salt thereof in an aqueous solution of at least one salt of monovalent ions, wherein said salt of monovalent ions is present in said aqueous solution in an amount of at least 10% by weight;
- b. diluting said aqueous solution of said polyphosphazene polyacid or acid salt thereof and said at least one salt of monovalent ions, such that the concentration of said salt of monovalent ions is less than that in step (a), thereby precipitating said polyphosphazene polyacid or acid salt thereof;
- and
- c. recovering said precipitated polyphosphazene polyacid or acid salt thereof.
Dependencies are inferred from the claim text.