Hydrogel
AssigneeSekisui Plastics Co., Ltd.
InventorsRyo Iizuka, Kazuki Kato
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Abstract
A hydrogel 1 having a laminate structure of layer A 10 and layer B 20, wherein layer A 10 contains a monomer-derived component, water, a humectant, a water-insoluble polymer having tackiness and an amphiphilic polymer, the water-insoluble polymer is contained in a proportion of 3 to 20 wt % based on a total amount of layer A, and the amphiphilic polymer is a polyvinyl alcohol having a saponification degree of 50 to 75% and is contained in a proportion of 0.05 to 5 wt % based on the total amount of layer A; layer B 20 contains a monomer-derived component, water and a humectant and is substantially free of a water-insoluble polymer having tackiness and a polyvinyl alcohol; and an amount of the water based on a total amount of layer B is the amount of water based on the total amount of layer A±10 wt %.
Claims7
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 %.
Dependencies are inferred from the claim text.