Methods for the preparation of crosslinked carboxyalkyl cellulose fibers having permanent and non-permanent crosslinks
AssigneeWeyerhaeuser NR Company
InventorsMengkui Luo, S. Ananda Weerawarna, Jian Qin, James H Wiley
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Abstract
Methods for making substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers, wherein the fibers have a surface having the appearance of the surface of a cellulose fiber, and wherein the fibers include a plurality of non-permanent intra-fiber metal crosslinks and a plurality of permanent intra-fiber crosslinks.
Claims20
A method for making substantially water-insoluble, water-swetlable, carboxyalkyl cellulose fibers, comprising:
- (a) treating cellulose fibers with a carboxyalkylating agent in a carboxyalkylating medium to provide carboxyalkyl cellulose fibers;
- and
- (b) treating the carboxyalkyl cellulose fibers with a multi-valent metal ion crosslinking agent and a second crosslinking agent to provide substantially water-insoluble, water-swellable, carboxyalkyl cellulose fibers, wherein the second crosslinking agent imparts permanent crosslinks to the fibers, and
- wherein the fibers retain their fibrous form throughout the method.
A method for making substantially water-insoluble, water-swellable, carboxyalkyl cellulose fibers, comprising:
- (a) treating cellulose fibers with a carboxyalkylating agent and a crosslinking agent that imparts permanent crosslinks to the fibers to provide crosslinked carboxyalkyl cellulose fibers;
- and
- (b) treating the crosslinked carboxyalkyl cellulose fibers with a multi-valent metal ion crosslinking agent to provide substantially water-insoluble, water-swellable, carboxyalkyl cellulose fibers,
- wherein the fibers retain their fibrous form throughout the method.
A method for making substantially water-insoluble, water-swellable, carboxyalkyl cellulose fibers, comprising:
- (a) treating crosslinked cellulose fibers with a carboxyalkylating agent to the fibers to provide crosslinked carboxyalkyl cellulose fibers;
- and
- (b) treating the crosslinked carboxyalkyl cellulose fibers with a multi-valent metal ion crosslinking agent to provide substantially water-insoluble, water-swellable, carboxyalkyl cellulose fibers, wherein the fibers retain their fibrous form throughout the method.
Dependencies are inferred from the claim text.