| abstract |
An object of the present invention is to provide a cross-linked polymer which is excellent in liquid absorbing ability and which can sufficiently undergo gel breakage. The present invention is an N-vinyl lactam-based cross-linked polymer, characterized in that the N-vinyl lactam-based cross-linked polymer has a structural unit derived from an N-vinyl lactam-based monomer and a As for the structural unit of triallyl urate, the ratio of the structural unit derived from triallyl cyanurate is 0.12 to 0.48 mol % with respect to 100 mol % of all the structural units. |