Dissolution and processing of cellulose
AssigneeConvatec Technologies Inc.
InventorsDavid Kershaw, Simon Adams
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Abstract
The invention relates to a method for dissolving the components of gel forming materials suitable for use in wound care comprising the steps of admixing said components with an ionic liquid. The ionic liquid may be selected from the group of tertiary amine N-oxides, N,N-dimethyl formamide/nitrogen tetroxide mixtures, dimethyl sulphoxide/paraformaldehyde mixtures and solutions of limium chloride in N,N-dimethyl acetamide or N-methyl pyrrolidone.
Claims7
A solution consisting of a chemically modified cellulose dissolved in an ionic liquid wherein the chemically modified cellulose is carboxymethylcellulose, and the ionic liquid consists essentially of a liquid ionic compound which is liquid below 150 ° C., the liquid ionic compound having:
- (i) a cation with a structure selected from:
- wherein
- R1 and R2 are independently C1-C6 alkyl or C1-C6 alkoxyalkyl;
- and
- R3, R4, R5, R6, R7, R8, and R9 are independently H, C1-C6 alkyl, C1-C6 alkoxyalkyl, or C1-C6 alkoxy;
- and
- (ii) an anion selected from halogen, pseudohalogen, or C1-C6 carboxylate.
Dependencies are inferred from the claim text.