CPC A61L 31/145 (2013.01) [A61L 31/041 (2013.01); B32B 27/18 (2013.01); B32B 27/306 (2013.01); C08F 222/385 (2013.01); C08J 3/075 (2013.01); C09J 7/30 (2018.01); C09J 11/04 (2013.01); C09J 11/06 (2013.01); A61B 5/259 (2021.01); A61B 5/291 (2021.01); A61B 5/296 (2021.01); A61B 5/398 (2021.01); A61B 18/16 (2013.01); A61B 2018/00601 (2013.01); A61B 2562/0215 (2017.08); A61B 2562/0217 (2017.08); A61N 1/0428 (2013.01); A61N 1/0456 (2013.01); C08J 2335/00 (2013.01); C08J 2435/00 (2013.01)] | 7 Claims |
1. A hydrogel having a laminate structure of layer A and layer B, wherein
layer A
comprises a monomer-derived component, water, a humectant, a water-insoluble polymer having tackiness and an amphiphilic polymer,
the water-insoluble polymer is comprised in a proportion of 3 to 20 wt %, and water is comprised in a proportion of 13 to 40 wt %, based on a total amount of the layer A, and
the amphiphilic polymer is a polyvinyl alcohol having a saponification degree of 50 to 75% and is comprised in a proportion of 0.05 to 5 wt % based on the total amount of the layer A;
layer B
comprises a monomer-derived component, water and a humectant and
is substantially free of a water-insoluble polymer having tackiness and a polyvinyl alcohol;
an amount of the water based on a total amount of the layer B is the amount of water based on the total amount of the layer A±10 wt %; and
an amount of the humectant based on the total amount of the layer B is an amount of the humectant based on the total amount of the layer A±10 wt %.
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