Polyureaurethane material and method of producing a polyureaurethane material
The present invention relates to a linear polyureaurethane polymer, produced without the use of any chain extender. The hard block of the resulting polymer thus consists of diisocyante groups linked to each other via without the presence of any chain extender component. The hard block of the polyureaurethane material is preferably synthesized by using diisocyante groups in the form of lysine diisocyanate (LDI). The soft block component of the polyureaurethane material is preferably poly(epsilon-caprolactone) (PCL). The invention also relates to a method of producing a polyureaurethane polymer, which in short comprises the steps of reacting a soft block component with a diisocyante group in order to prepare a prepolymer component, combining the prepolymer component with a catalyst in order to define a reaction solution and adding water to the reaction solution, preferably carried to the reaction solution in vapour phase.
1 . A non-crosslinked polyureaurethane material comprising at least one soft block component and at least one hard block synthesized by using diisocyante groups characterized in that the polyureaurethane material is produced without the use of any chain extender, whereupon in the at least one hard block, one diisocyante derived group is linked to another diisocyanate derived group without the presence of any chain extender component.
2 . A non-crosslinked polyureaurethane material according to claim 1 , characterized in that the diisocyante groups used are in the form of one of lysine diisocyanate (LDI), hexamethylene-diisocyanate (HDI), 4,4′-methylene-bis(phenyl isocyanate) (MDI), 4,4′-methylenebis(cyclohexane isocyante) (HMDI) and 2,4-toluene diisocyante (TDI).
3 . A non-crosslinked polyureaurethane material according to claim 1 , characterized in that the diisocyante groups used are in the form of lysine diisocyanate (LDI).
4 . A non-crosslinked polyureaurethane material according to claim 1 , characterized in that the mean value of the number of diisocyanate derived groups in the at least one hard block is at least 2.3.
5 . A non-crosslinked polyureaurethane material according to claim 1 , characterized in that the mean value of the number of diisocyanate derived groups in the at least one hard block is in the range from at least 2.3 to at least 11.6.
6 . A non-crosslinked polyureaurethane material according to claim 1 , characterized in that the at least one soft block component is a polyester or a polyether.
7 . A non-crosslinked polyureaurethane material according to claim 6 , characterized in that the polyester is made from any of the monomers glycolide, lactide, epsilon-caprolactone, trimethylene carbonate, paradioxanone or any copolymer thereof.
8 . A non-crosslinked polyureaurethane material according to claim 6 , characterized in that the polyester is made from any dicarboxylic acid, a diol or alcohole terminated polyether.
9 . A non-crosslinked polyureaurethane material according to claim 8 , characterized in that the dicarboxylic acid is succinic acid, glutaric acid, adipic acid, maleic acid or fumaric acid and that the diol is ethyleneglycol, propyleneglycol, butandiol, polyethyleneglycol, polypropyleneglycol or various copolymers between ethyleneoxide and propyleneoxide
10 . A non-crosslinked polyureaurethane material according to claim 6 , characterized in that the polyether is made from diols, polyethyleneglycol, polypropyleneglycol, or copolymers of ethyleneoxide and propyleneoxide.
11 . A non-crosslinked polyureaurethane material according to claim 1 , characterized in that the at least one soft block component is a biomolecule or that the material is linked to a biomolecule.
12 . A non-crosslinked polyureaurethane material according to claim 11 , characterized in that the biomolecule is a carbohydrate
13 . A non-crosslinked polyureaurethane material according to claim 1 , characterized in that the material swell in water and possess gel like properties.
14 . Method for producing a polyureaurethane material, such as the material according to claim 1 , comprising:
reacting a soft block component with a diisocyante group in order to prepare a prepolymer component and defining a reaction solution,
adding water to the reaction solution.
15 . Method according to claim 14 , wherein the water is brought to the reaction solution in vapour phase.
16 . Method according to claim 14 , characterized in that the water is brought to liquid phase in the reaction solution.
17 . Method according to claim 14 , characterized in that the soft block component is selected among the group consisting of polyethers and polyesters.
18 . Method according to claim 14 , characterized in that the diisocyanate group is selected among the group consisting of lysine diisocyanate (LDI), hexamethylene-diisocyanate (HDI), 4,4′-methylene-bis(phenyl isocyanate) (MDI), 4,4′-methylenebis(cyclohexane isocyante) (HMDI) and 2,4-toluene diisocyante (TDI).