| abstract |
It is excellent in adhesion with the electrode element and has little adherence to the electrode element or the object and deterioration of the adhesion property even if it absorbs moisture such as sweat and moisture and has an optimum adhesive force to the skin surface and The present invention also provides a hydrogel which does not give a hydrogel. A hydrogel (1) having a laminated structure of an A layer (10) and a B layer (20), wherein the A layer (10) contains a monomer-derived component, water, a humectant, a sticking water-insoluble polymer and an amphipathic polymer Wherein the amphipathic polymer is a polyvinyl alcohol having a degree of saponification of 50 to 75% and a content of the water-insoluble polymer is 0.05 to 5% by weight based on the total amount of the layer A, Insoluble polymer and polyvinyl alcohol which are sticky are substantially not contained and the amount of the water relative to the total amount of the B layer is less than the amount of the water of the A layer And the amount of the humectant relative to the total amount of the layer B is ± 10% by weight of the amount of the humectant relative to the total amount of the layer A. |