| abstract |
A cross-linked polymer containing, in itsnmolecule, recurring units represented by the followingnformula (1), and having biodegradability and highnwater-absorbency:n nwherein R 1 is a pendant group having at least one functionalngroup selected from the group consisting ofnacidic groups and salts thereof, a glycino group andnsalts thereof, cationic groups and betaine groups; X 1 nis NH, NR 1 ', R 1 ' being an alkyl, aralkyl or aryl group,nO or S; and n 1 is 1 or 2. |