Stabilised solutions of polysaccharide
AssigneeCourtaulds Fibres (Holdings) Limited
InventorPeter George Urben
Life of this patent
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Abstract
The use together of (1) an aromatic compound containing a benzene ring bearing at least two substituents selected from the group consisting of hydroxy groups, primary amino groups and secondary amino groups and (2) a sulphur-containing compound containing an --SH group or an anion or precursor thereof, not being a carbocyclic arenethiol, is effective in stabilising solutions of polysaccharides such as cellulose in tertiary amine N-oxides against thermal degradation. Such solutions are useful for the manufacture of extruded articles such as fibers and films.
Claims19
A solution of a polysaccharide in a hydrated tertiary amine N-oxide, comprising (1) an aromatic compound containing a benzene ring bearing at least two substituents selected from the group consisting of hydroxy groups, primary amino groups and secondary amino groups and (2) a sulphur-containing compound containing an --SH group or an anion thereof or a precursor of such a compound, provided that the said sulphur-containing compound is not a carbocyclic arenethiol.
A process for making a shaped article of a polysaccharide including the steps of:
- (a) dissolving the polysaccharide in a hydrated tertiary amine N-oxide to form a solution;
- (b) extruding the solution through a die to form a shaped member;
- (c) passing the shaped member through at least one water-containing bath, thereby removing the solvent from the shaded member and forming the shaped article;
- and
- (d) drying the shaped article,
- characterised by incorporating in the solution (1) an aromatic compound containing a benzene ring bearing at least two substituents selected from the group consisting of hydroxy groups, primary amino groups and secondary amino groups and (2) a sulphur-containing compound containing an --SH group or an anion thereof or a precursor of such a compound, provided that the said sulphur-containing compound is not a carbocyclic arenethiol.
Dependencies are inferred from the claim text.