Polyphosphazene polymers containing cyclic ketal substituents and process for producing them.

摘要

Polyphosphazene polymers are prepared which contain repeating units of the formulas:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="19" wi="54" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein X is represented by
<Chemistry id="chema02" num="0002"><Image id="ia02" he="15" wi="46" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein R, and R<Sub>2</Sub> independently are substituted or unsubstituted aliphatic, aryl, araryl, alkylaryl or heterocyclic radicals or R, and R<Sub>2</Sub> can be linked to form a cyclic radical and R<Sub>3</Sub> is an aliphatic hydrocarbon radical or hydrogen, X' is chlorine, a substituted or unsubstituted alkoxa, aryloxy, amino or mercapto substituent group or mixtures thereof which are compatible with an N-substituted amino substituent; and 20 ≤ (w+y+z) ≤ 50,000 per polymer and (y+z) > 0.

The polymers may be prepared by reacting a poly(di- chlorphosphazene) of formula -(NPCl<Sub>2</Sub>)<Sub>n</Sub>- ; wherein n is from 20 to 50,000, with a cyclic ketal containing a hydroxy group in the presence of a tertiary amine, optionally followed by addition of an alkanol, phenol, amine, or mercaptan.

The polymers of the invention can be utilized in forming protective films and also in applications such as molding, coatings, foams and the like.