Sekisui Kasei Co., Ltd.

Nichiban Company Limited

Inoac Technical Center Co.. Ltd.

Eisaku Sato

Kazutoshi Haraguchi

Takahiko Fujita

Yoshiko Koike

Ryuji Saito

Tomonori Ikai

The hydrogel of the present invention is a hydrogel comprising a polymer matrix, water and a plasticizer, wherein the hydrogel is characterized in that 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 the environment of 23° C. and 55% RH. The plasticizer is preferably polyoxyalkylene alkyl ether and/or sugar. The initial high adhesive force is retained by suppressing the swelling of the gel due to invasion of water from the outside and reducing the loss of a plasticizer.

Hydrogel

Growing community of inventors

Osaka, Japan

Eisaku Sato