| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject derivative which has excellent biodegradability and further has excellent water absorbability, by irradiating a mixture comprising an alkylcellulose derivative and water with radiations. SOLUTION: This method for producing a self-crosslinked alkylcellulose derivative comprises irradiating a mixture comprising (A) 100 pts.wt. of an alkylcellulose derivative as a raw material (the alkyl group has one to three carbon atoms and may be substituted by one or more hydroxyl groups, or the like) and (B) 5 to 2,000 pts.wt. of water with radiations. The component A is preferably a carboxyalkylcellulose, a hydroxyalkylcellulose, an alkylcellulose or their mixture, which has at least one hydroxyl group or carboxyl group per glucose unit. 20% or more of the total amount of the hydroxyl groups and carboxyl groups of the component A is especially preferably their alkali metal salts, ammonium salts or amine salts.
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