Polyphosphazene polymers containing cyclic ketal substituents

Abstract From the Canadian patent

Polyphosphazene polymers are prepared which contain repeating units represented by the formulas: wherein X is represented by, wherein R1 and R2 are independently selected from a group consisting of substituted or unsubstituted alkphatic aryl, araryl, alkylaryl, and heterocyclic radicals or R1 and R2 can be linked to form a cyclic radical and R3 is an aliphatic hydrocarbon radical or hydrogen X' is a substituted or unsubstituted alkoxy aryloxy, amino or, mercapto substituent group or mixtures thereof which are compatible with an N-substituted amino substituent and are known in the state of the art of polyphosphazene technology; and 20 ? (w + y +z) ? 50,000 per polymer and (y + z) > 0. The …