Polyurethanes based on terminal diol- and diaminopolyphosphazenes and their hydrogels
AssigneeCovestro Deutschland AG
InventorsJan Suetterlin, Heike Heckroth, Frank Richter, Ian Teasdale, Oliver Brueggemann, Oliver Plavcan
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Abstract
The present invention relates to polyphosphazenes, polyurethanes based on these polyphosphazenes, methods for their manufacture and hydrogels based on the polyurethanes. The invention further relates to the use of the hydrogels in medical, veterinary and agricultural applications. The terminal ends of the polyphosphazenes bear NCO-reactive hydrogen atoms for reaction with polyisocyanates.
Claims15
A polyphosphazene of the general formula (I):
- where:
- each radical R is, independent of other radicals R, an organic radical which does not contain a terminal group with an NCO-reactive hydrogen atom;
- each radical R1 is, independent of other radicals R1, an organic rest;
- each radical X is, independent of other radicals X, an organic rest;
- n is zero or a positive integer;
- characterized in that
- each radical ZH is, independent of other radicals ZH, a group comprising an NCO-reactive hydrogen atom.
A method of manufacturing a polyphosphazene according to the general formula (II), comprising reacting a C═C double bond-carrying compound of the general formula (III) with an element-hydrogen bond-carrying compound of the general formula H-E-L-ZH:
- where:
- each radical E is, independent of other radicals E, B, Si or S;
- each radical L is, independent of other radicals L, an organic radical;
- each radical ZH is, independent of other radicals ZH, a group comprising an NCO-reactive hydrogen atom;
- each radical R is, independent of other radicals R, an organic radical which does not contain a terminal group with an NCO-reactive hydrogen atom;
- each radical R1 is, independent of other radicals R1, an organic rest;
- each radical Y is, independent of other radicals Y, an organic rest and
- n is zero or a positive integer.
Dependencies are inferred from the claim text.