US 11,696,975 B2
Hydrogel
Ryo Iizuka, Ibaraki (JP); and Kazuki Kato, Ibaraki (JP)
Assigned to SEKISUI PLASTICS CO., LTD., Osaka (JP)
Appl. No. 16/338,308
Filed by SEKISUI PLASTICS CO., LTD., Osaka (JP)
PCT Filed Sep. 22, 2017, PCT No. PCT/JP2017/034268
§ 371(c)(1), (2) Date Mar. 29, 2019,
PCT Pub. No. WO2018/062030, PCT Pub. Date Apr. 5, 2018.
Claims priority of application No. 2016-193679 (JP), filed on Sep. 30, 2016; and application No. 2017-031855 (JP), filed on Feb. 23, 2017.
Prior Publication US 2020/0016300 A1, Jan. 16, 2020
Int. Cl. A61L 31/14 (2006.01); A61L 31/04 (2006.01); B32B 27/18 (2006.01); B32B 27/30 (2006.01); C08F 222/38 (2006.01); C08J 3/075 (2006.01); C09J 7/30 (2018.01); C09J 11/04 (2006.01); C09J 11/06 (2006.01); A61B 5/259 (2021.01); A61B 5/296 (2021.01); A61B 5/398 (2021.01); A61B 18/16 (2006.01); A61B 18/00 (2006.01); A61N 1/04 (2006.01); A61B 5/291 (2021.01)
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
OG exemplary drawing
 
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 %.