Dissolution and processing of cellulose

Patent metadata

Field	Value
Publication number	US-2016251451-A1
Application number	US-201615147739-A
Country	US
Kind code	A1
Filing date	May 5, 2016
Priority date	Nov 24, 2006
Publication date	Sep 1, 2016
Grant date	—

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.

First claim

1 ) 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.

2 ) A method as claimed in claim 1 wherein the gel forming material is a gel forming fibre.

3 ) A method as claimed in claim 2 wherein the gel forming fibre is a modified cellulose fibre.

4 ) A method as claimed in any preceding claim wherein the ionic liquid is selected from the group of tertiary amine N-oxides, N,N-dimethyl formamide/nitrogen tetroxide mixtures, dimethyl sulphoxide/paraformaldehyde mixtures and solutions of lithium chloride in N,N-dimethyl acetamide or N-methyl pyrrolidone.

5 ) A method as claimed in any preceding claim wherein the components of gel forming materials suitable for use in wound care are a carboxymethylcellulose powder.

6 ) A solution comprised of a chemically modified cellulose in an ionic liquid.

7 ) A solution as claimed in claim 6 wherein the ionic liquid is selected from the group of tertiary amine N-oxides, N,N-dimethyl formamide/nitrogen tetroxide mixtures, dimethyl sulphoxide/paraformaldehyde mixtures and solutions of lithium chloride in N,N-dimethyl acetamide or N-methyl pyrrolidone.

8 ) A solution as claimed in claims 6 and 7 wherein the chemically modified cellulose is carboxymethylcellulose powder.

9 ) A method for regeneration of chemically modified cellulose that comprises admixing a solution of chemically modified cellulose in an ionic liquid with a liquid non-solvent for the chemically modified cellulose that is miscible with said ionic liquid, said admixing causing the cellulose and ionic liquid to form solid and liquid phases.

10 ) A method for electrospinning a chemically modified cellulose that comprises spinning a solution of chemically modified cellulose in an ionic liquid into a bath of a liquid non-solvent for the chemically modified cellulose that is miscible with the ionic liquid, said spinning causing the cellulose and ionic liquid to form fibres and a liquid phase.

Assignees

• Convatec Technologies Inc

Inventors

• Kershaw David
• Adams Simon

Classifications

• D01D5/06

  Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title

• C08L1/286

  substituted with acid radicals, e.g. carboxymethyl cellulose [CMC] (C08L1/282 takes precedence) · CPC title

• D01D5/0046

  the fibre formed by coagulation, i.e. wet electro-spinning · CPC title

• C08B11/20

  Post-etherification treatments of chemical or physical type, {e.g. mixed etherification in two steps}, including purification · CPC title

• A61K31/717

  Celluloses · CPC title