Polyurethanes based on side chain diol- and diaminopolyphosphazenes and their hydrogels
AssigneeCovestro Deutschland AG
InventorsHeike Heckroth, Frank Richter, Jan Suetterlin, Ian Teasdale, Oliver Brueggemann, Jan-Patrick Bachmann, Christoph Ulbricht, Susanne Kimeswenger, Florian Hartmann
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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.
Claims14
A polyphosphazene comprising the structural unit according to general formula (I):
- where:
- each radical ZH is, independent of other radicals ZH, a group comprising an NCO-reactive hydrogen atom;
- each radical X is, independent of other radicals X, an organic rest;
- each radical R1 is, independent of other radicals R1, hydrogen or an organic radical;
- each radical R is, independent of other radicals R, halogen, an organic radical or the radical group NR1—X—ZH,
- n is a positive integer and
- wherein at least one radical X comprises one of the following groups:
- —B—CH2—CH2—, —Si—CH2—CH2—or —S—CH2—CH2—, wherein the —CH2—CH2— groups are located between the B, Si or S atoms and an N atom to which radicals R1 are bond.
A method of manufacturing a polyphosphazene comprising the structural unit according to general formula (II), the method comprising reacting a C═C double bond-carrying compound comprising the structural unit of general formula (III) with an element-hydrogen bond-carrying compound according to 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 R1 is, independent of other radicals R1, hydrogen or an organic radical;
- each radical R2 is, independent of other radicals R2, halogen, an organic radical or the radical group NR1—Y—;
- each radical Y is, independent of other radicals Y, an organic rest and
- n is a positive integer.
Dependencies are inferred from the claim text.