Purification of polyphosphazene polyacids

Details Purification of polyphosphazene polyacids Purification of polyphosphazene polyacids

C - Chemistry, Metallurgy

08

G

C08G 79/02 (2006.01)

Patent

CA 2289130

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.

La présente invention se rapporte à un procédé de purification d'un polyacide de polyphosphazène, ou d'un sel acide de celui-ci, dans lequel un polyacide de polyphosphazène, ou un sel acide de celui-ci, est dissous dans une solution aqueuse concentrée d'un sel d'ions monovalents. La solution aqueuse résultante du polyacide de polyphosphazène, ou du sel acide de celui-ci, et dudit sel d'ions monovalents est ensuite diluée pour réduire la concentration dudit sel d'ions monovalents, le polyacide de polyphosphazène ou le sel acide de celui-ci étant précipité. Le polyacide de polyphosphazène ou le sel acide de celui-ci est alors récupéré.

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