Solubility of cellulose in ionic liquids with addition of amino bases

A solution comprising cellulose, an ionic liquid comprising anions and cations as solvent and 6-30% by weight of a nitrogen-comprising base, based on the total weight of the solution, wherein the ionic liquid comprises at least one cation of formula (IVe)

• and oligomers comprising these structures, where
• the radical R is hydrogen, a carbon-comprising organic, saturated or unsaturated, acyclic or cyclic, aliphatic, aromatic or araliphatic radical which has from 1 to 20 carbon atoms and is unsubstituted or interrupted by from 1 to 5 heteroatoms or functional groups or substituted;
• and
• the radicals R1 to R4 are each, independently of one another, hydrogen, a sulfo group or a carbon-comprising organic, saturated or unsaturated, acyclic or cyclic, aliphatic, aromatic or araliphatic radical which has from 1 to 20 carbon atoms and is unsubstituted or interrupted by from 1 to 5 heteroatoms or functional groups or substituted, with the radicals R1 to R4 which are bound to a carbon atom (and not to a heteroatom) in the abovementioned formulae (IV) also being able to be halogen or a functional group;
• or
• two adjacent radicals from the group consisting of R1 to R4 can together also be a divalent, carbon-comprising organic, saturated or unsaturated, acyclic or cyclic, aliphatic, aromatic or araliphatic radical which has from 1 to 30 carbon atoms and is unsubstituted or interrupted by from 1 to 5 heteroatoms or functional groups or substituted,
• wherein the nitrogen-comprising base is a compound whose nitrogen atom or atoms is/are primary, secondary or tertiary and which is derived from the quaternary compounds of formula (IVe), with the radical R forming the quaternary nitrogen of the quaternary compounds not being present and R1-R4, independently of one another, are as defined above.