Cellulose monoester fibres of high absorbency

Details Cellulose monoester fibres of high absorbency Cellulose monoester fibres of high absorbency

D - Textiles, Paper

01

F

18/597

D01F 2/28 (2006.01)

Patent

CA 1229208

ABSTRACT OF THE DISCLOSURE Production of the water insoluble fibres having high absorptivity for water and physiological fluids is carried out in that: a) a solution of activated cellulose in dimethyl acetamide or 1-methyl-2-pyrrolidone is produced at 20 to 80°C, the said solution containing 5 to 30% by weight of activated cellulose having an average degree of polymerization of 300 to 800 and con- taining 3 to 20% by weight of LiCl: b) this is reacted with a dicarboxylic acid anhydride of maleic, succinic or phthalic acid in a molar ratio of 1:0.20 to 1:4, at 20 to 120°C, in the presence of an esterifying catalyst, to a degree of esterification of 0.1 to 1.7, c) the cellulose monoester solutions are wet-spun in a coagulating agent; d) fibres made from cellulose monoesters of phthalic acid and, if necessary, those made from cellulose esters of maleic acid and succinic acid, are con- verted, in a substantially organic solvent, by reacting with alkali metal hydroxides and/or alcoholates, ammonia, or primary or secondary amines, partly or wholly into corresponding fibrous salts.

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