Procedure for the preparation of modified cellulose

Details Procedure for the preparation of modified cellulose Procedure for the preparation of modified cellulose

1985-12-16

1987-08-25

Bell, James J.

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

8120, 8193, 8DIG8, 428913, A61F 1316

Patent

active

046890459

ABSTRACT:
A dry fibrous product made from modified cellulose, having improved properties of absorption and water and physiological liquid retention, as well as its production procedure. The cellulose contained in a cellulose paste is activated, acrylonitrile is grafted to the cellulose while its dry content is sufficient to obtain a grafting rate of about 200%; the grafted cellulose paste is hydrolyzed with an alkali; the product is washed with water until a state of maximum expansion is reached; the product is acidified to a pH which brings it to a state of minimum expansion after the water is removed; the product is converted to its salt form in the presence of a water-miscible liquid, and under an agitation which is sufficient to prevent the clustering of the fibers; this is effected so that the quantity of water, expressed by volume, does not exceed about 10% of the liquid phase; the product is dried.

REFERENCES:
patent: 4036588 (1977-07-01), Williams
patent: 4151130 (1979-04-01), Adams

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