Process for producing water-absorbent cross-linked, carboxyalkyl

Details Process for producing water-absorbent cross-linked, carboxyalkyl Process for producing water-absorbent cross-linked, carboxyalkyl

1996-08-01

1998-03-10

Diamond, Alan

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

Cellulose fibers

81157, 81161, 8191, 8193, 8181, 8194, 162 9, 1621576, 162182, 162146, 162100, 162 95, 162142, 162148, 162 72, 162 74, D04H 164, A61L 1500

Patent

active

057256012

ABSTRACT:
A water absorbent cross-linked, carboxyalkylated cellulose-containing material is produced by impregnating a cellulose-containing material with an aqueous reaction solution including a carboxyalkylating agent, an alkali metal hydroxide, and a cross-linking agent dissolved in water in an initial content of 50 to 90% by weight, the molar ratio of the carboxylating agent to glucose groups of cellulose being 0.7 to 2.0; adjusting the water content of the aqueous reaction solution impregnated in the cellulose-containing material to 20 to 60% by weight and of at least 5% by weight below the initial water content by evaporating a portion of water; and subjecting the water content-adjusted cellulose-containing material to a simultaneous cross-linking and carboxylating reaction procedure at 50.degree. to 110.degree. C., while maintaining the water content at 20 to 60% and of at least 5% by weight below the initial water content.

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patent: 5071681 (1991-12-01), Manning et al.
patent: 5470964 (1995-11-01), Qin
Research Disclosure, 17060; Jun. 1978; E I du Pont de Nemours & Co., Inc. "Composite of Synthetic-Fiber Web and Paper".

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