| abstract |
(57) [Problem] To provide a novel biodegradable water-absorbing resin comprising a cross-linked poly-γ-glutamic acid. SOLUTION: This is a biodegradable water-absorbing resin comprising a crosslinked poly-γ-glutamic acid, and satisfies the following relationships (1) to (4). (1) Compound having two or more functional groups in the same molecule capable of reacting with (A) poly-γ-glutamic acid or (B) poly-γ-glutamate and (C) a carboxyl group derived from poly-γ-glutamic acid And a biodegradable water-absorbent resin. (2) The biodegradable water-absorbent resin according to (1), wherein (B) is obtained by reacting 0.5 to 1.0 equivalent of a basic compound with respect to 1 equivalent of the carboxylic acid of poly-γ-glutamic acid. (3) The biodegradable superabsorbent resin according to (1), wherein (C) is a polyepoxy compound. (4) 10 of (A) or (B) (1) The biodegradable superabsorbent resin according to (1), wherein 0.1 to 5.0 parts by weight of the polyepoxy compound is reacted with 0 parts by weight. |