Process for drying polymer-modified cellulose fibres and product

Details Process for drying polymer-modified cellulose fibres and product Process for drying polymer-modified cellulose fibres and product

1975-06-24

1977-05-24

Woodberry, Edward M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

128284, 128285, 128290R, 128296, C08L 102, C08L 126

Patent

active

040254720

ABSTRACT:
An economic process is provided for effectively drying wet, highly swollen, polymer-modified, cellulosic fibres to provide fibres having enhanced properties of both water and physiological liquid retention. The essential steps of the drying process are as follows: First, the hydrolyzed fibres are thoroughly washed with water, thus rendering them to a substantially maximum swollen state. The fibres are then acidified to a low, critical pH whereby the water previously retained by the alkaline fibre is released and filtered off, thus rendering them to a substantially minimum swollen state. The product may be subjected to an optional non-shearing stirring step while in a low consistency dispersion prior to the acidification step. Further treatment with an alkali non-swelling solvent mixture renders the fibres substantially water-free in their alkaline salt form. A final wash and drying step using substantially water-free solvent and heat complete the process to yield dry, polymer-modified, cellulosic fibres having enhanced properties of both water and physiological liquid retention. New fibres can be produced having water retention values above 40g/g and aqueous salt retention values above 16 g/g.

REFERENCES:
patent: 3935099 (1976-01-01), Weaver et al.

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