A composition for an adhesive hydrogel, comprising at least: a polymeric matrix former water and a polyhydric alcohol the polymeric matrix former comprising at least: (a) (meth)acrylic acid, a (meth)acrylic acid derivative or a vinyl derivative having 2 carboxyl groups and 4 or 5 carbon atoms (b) (meth)acrylamide or a (meth)acrylamide derivative (c) N-vinyl-2-caprolactam and/or N-vinyl-2-valerolactam and (d) a cross-linkable monomer, wherein the content percentage of the (b) in the composition for an adhesive hydrogel is 2 to 20% by weight.
