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AssigneeBASF SE
InventorsVeit Stegmann, Klemens Massonne, Matthias Maase, Eric Uerdingen, Michael Lutz, Frank Hermanutz, Frank Gaehr
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A solution system for biopolymers in the form of carbohydrates based on a molten ionic liquid, additives optionally being contained in the solution system, is described. This solution system contains a protic solvent or a mixture of several protic solvents, and in the case where the protic solvent is solely water, this is present in the solution system in an amount of more than about 5 wt. %. Carbohydrates can be incorporated into the solution system, in particular in the form of starch, cellulose and derivatives thereof, and it can then be used for regeneration of the carbohydrates contained therein. A particularly advantageous process for the preparation of the solution system containing the carbohydrates and for the preparation of regenerated carbohydrates, in particular in the form of regenerated cellulose fibers, is moreover described. The invention accordingly also provides such spun fibers as are distinguished in that they are non-fibrillating. The invention offers in particular economic advantages over the systems of the prior art.
A process for the preparation of regenerated biopolymers in the form of carbohydrates, using a solution system containing comprising the biopolymers, wherein the solution system is based on a molten ionic liquid and a protic solvent or a mixture of several protic solvents, wherein, in the case where the protic solvent is solely water, the water is present in the solution system in an amount of more than 5 wt. %, the biopolymers dissolved in the solution system are precipitated in a coagulation medium, the coagulation medium comprising a solvent which does not dissolve the biopolymers and is miscible with the molten ionic liquid.
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A spun fiber based on regenerated cellulose having a wet fibrillation rating of less than or equal to 2.
A spun fiber based on regenerated cellulose which is non-fibrillating and has a content of sulfur of less than 1 mg/g and a copper content of less than 20 μg/g.
A solution system for biopolymers in the form of carbohydrates based on a molten ionic liquid and a protic solvent or a mixture of several protic solvents, additives optionally being present in the solution system, wherein the molten ionic liquid has a melting point of from −100 to +150° C. and, in the case where the protic solvent is solely water, the water is contained present in the solution system in an amount of more than about 5 wt. %.
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Dependencies are inferred from the claim text.