US 12,221,571 B2
Pressure-sensitive adhesive layer and pressure-sensitive adhesive sheet
Shuhei Yamamoto, Osaka (JP); and Amane Sawamura, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Ibaraki (JP)
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
Filed on Aug. 8, 2022, as Appl. No. 17/882,753.
Claims priority of application No. 2021-137429 (JP), filed on Aug. 25, 2021.
Prior Publication US 2023/0079057 A1, Mar. 16, 2023
Int. Cl. C09J 7/38 (2018.01); C09J 7/26 (2018.01)
CPC C09J 7/385 (2018.01) [C09J 7/26 (2018.01); C09J 2301/302 (2020.08); C09J 2433/00 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A pressure-sensitive adhesive layer consisting of
a dried product of a water-dispersed pressure-sensitive adhesive composition, wherein
the water-dispersed pressure-sensitive adhesive composition contains a water-dispersible polymer, water, polyacrylic acid, and a leveling agent;
the polyacrylic acid content is above 0.1 parts by mass and below 2.5 parts by mass with respect to 100 parts by mass of the water-dispersible polymer, and the leveling agent content is 150 parts by mass or more and 500 parts by mass or less with respect to 100 parts by mass of the polyacrylic acid, or
the polyacrylic acid content is 2.5 parts by mass or more and 7 parts by mass or less with respect to 100 parts by mass of the water-dispersible polymer, and the leveling agent content is 10 parts by mass or more and below 150 parts by mass with respect to 100 parts by mass of the polyacrylic acid; and
a thickness of the pressure-sensitive adhesive layer is 10 μm or more and 40 μm or less.