US 12,187,886 B2
Hydrogel
Eisaku Sato, Osaka (JP); and Takahiko Fujita, Osaka (JP)
Assigned to SEKISUI KASEI CO., LTD., Osaka (JP)
Appl. No. 17/042,107
Filed by SEKISUI KASEI CO., LTD., Osaka (JP)
PCT Filed Mar. 25, 2019, PCT No. PCT/JP2019/012413
§ 371(c)(1), (2) Date Sep. 26, 2020,
PCT Pub. No. WO2019/188936, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-069422 (JP), filed on Mar. 30, 2018.
Prior Publication US 2021/0102059 A1, Apr. 8, 2021
Int. Cl. C08L 33/26 (2006.01); A61L 26/00 (2006.01); A61L 31/04 (2006.01); A61L 31/14 (2006.01); C08L 5/00 (2006.01); C08L 71/02 (2006.01); C09J 7/38 (2018.01); C09J 11/06 (2006.01); C09J 133/14 (2006.01); C09J 133/26 (2006.01)
CPC C08L 33/26 (2013.01) [A61L 26/0052 (2013.01); A61L 26/0071 (2013.01); A61L 26/008 (2013.01); A61L 31/041 (2013.01); A61L 31/141 (2013.01); A61L 31/145 (2013.01); C08L 5/00 (2013.01); C08L 71/02 (2013.01); C09J 7/385 (2018.01); C09J 11/06 (2013.01); C09J 133/14 (2013.01); C09J 133/26 (2013.01); C08L 2203/02 (2013.01)] 3 Claims
 
1. A hydrogel comprising:
a polymer matrix formed from a copolymer of
a monofunctional monomer having one ethylenically unsaturated group, the monofunctional monomer comprising acrylamide and diacetoneacrylamide, the monofunctional monomer being present at 25-40% by weight with respect to 100% by weight of the hydrogel and
a crosslinkable monomer, the crosslinkable monomer comprised of N,N′-methylenebisacrylamide and being present at 0.03 to 0.2% by weight with respect to 100% by weight of the hydrogel,
water, and
a plasticizer consisting of polyoxyethylene methyl glucoside having 10 to 20 oxyethylene units,
in which the plasticizer is present at 21.12% to 54.23% by weight, with respect to 100% by weight of the hydrogel,
wherein:
the plasticizer loss ratio is less than 2,
the swelling rate is 115% or less when the hydrogel is exposed to the environment of 40° C. and 90% RH for 1 hour, and
the initial adhesive force to a Bakelite plate is 100 gf/20 mm or more in an environment of 23° C. and 55% RH.