Polyester urethanes
The present invention relates to polyester urethanes comprising polypentadecalactone segments. These polyester urethanes do show good properties which may be adjusted in a controlled manner. In preferred embodiments the polyester urethanes display additionally polycaprolactone segments. Such polymer may show shape memory effects.
1. A polyester urethane comprising segments of polypentadecalactone units.
2. A polyester urethane according to claim 1 further comprising at least one further segment comprising ester units or ether units different from the polypentadecalactone units.
3. A polyester urethane according to claim 2 , wherein the further segment is a partially crystalline segment comprising a polyester segment, a polyether ester segment, or polyether segments, or glassy segments comprising polyester or copolyester.
4. A polyester urethane according to claim 2 , wherein the further segment comprises polycaprolactone segments (PCL), polycaprolactone-co-polytetrahydrofuran segments (PCL-co-pTHF), tetrahydrofliran segments (pTHF), polypropyleneglycol segments (PPG) or polyethyleneglycol segments (PEG).
5. A polyester urethane according to claim 2 , wherein the further segment comprises poly-L-lactide-co-glycolide(ran) (PLGA) or poly-DL-lactide (P-DL-LA).
6. A polyester urethane according to claim 1 , wherein the segments of the polypentadecalactone units have a number average molecular weight of from 1000 to 20000 g/mol.
7. A polyester urethane according to claim 1 , wherein the further segment has a number average molecular weight of from 1000 to 20000 g/mol.
8. A polyester urethane according to claim 1 , having a number average molecular weight in the range of from 50000 to 250000 g/mol.
9. A polyester urethane according to claim 1 , obtained by reacting macrodiols with an aliphatic dilsocyanate.
10. A polyester urethane according to claim 1 , comprising 10 to 80 wt.-% polypentadecalactone units.
11. A polyester urethane according to claim 1 , having shape memory properties.
12. A polyester urethane according to claim 11 , comprising 20 to 80 wt.-% caprolactone units and 80 to 20 wt.-% polypentadecalactone units, wherein the segments of caprolactone units have a number average molecular weight of from 3000 to 11000 g/mol and wherein the segments of polypentadecalactone units have a number average molecular weight of from 1000 to 10000 g/mol.
13. A blend comprising at least one polyester urethane according to claim 1 and at least one further component selected from the group consisting of polyethylene, polypropylene, polystyrene, PVC, fillers, colorants and medicaments.
14. A process for preparing a foam comprising at least one polyester urethane according to claim 1 , the process comprising the step:
compounding at least one polyester urethane according to claim 1 with a foaming agent and extruding the foam; or
dissolving at least one polyester urethane according to claim 1 in a solvent and subjecting the solution to a thermally induced phase separation in order to prepare porous structures.