US 12,258,499 B2
Peeling method
Yosuke Shimizu, Ibaraki (JP)
Assigned to NITTO DENKO CORPORATION, Ibaraki (JP)
Appl. No. 18/032,446
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
PCT Filed Oct. 13, 2021, PCT No. PCT/JP2021/037973
§ 371(c)(1), (2) Date Apr. 18, 2023,
PCT Pub. No. WO2022/085546, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 2020-175486 (JP), filed on Oct. 19, 2020.
Prior Publication US 2023/0392044 A1, Dec. 7, 2023
Int. Cl. B32B 43/00 (2006.01); C09J 5/00 (2006.01); C09J 7/38 (2018.01); C09J 11/06 (2006.01)
CPC C09J 5/00 (2013.01) [B32B 43/006 (2013.01); C09J 7/385 (2018.01); C09J 11/06 (2013.01); B32B 2310/0825 (2013.01); C09J 2301/302 (2020.08); C09J 2301/408 (2020.08); C09J 2301/414 (2020.08); C09J 2301/416 (2020.08); C09J 2301/502 (2020.08); C09J 2400/146 (2013.01); C09J 2433/00 (2013.01); Y10T 156/1158 (2015.01); Y10T 156/1917 (2015.01)] 7 Claims
OG exemplary drawing
 
1. A method for peeling an adherend from a pressure-sensitive adhesive layer by irradiating a laminate in which the pressure-sensitive adhesive layer and the adherend are laminated with light, the method comprising:
a step of irradiating the pressure-sensitive adhesive layer with the light having a pulse width of 1 second or less and a light irradiation amount of 1,000 mJ/cm2 or more, wherein
the pressure-sensitive adhesive layer satisfies the following conditions (1) and (2) in terms of a minimum transmittance in a near-infrared region of a wavelength of 800 nm to 2,500 nm and a maximum transmittance in a visible light region of a wavelength of 380 nm to 780 nm, which are measured using a measurement sample in which a first non-alkali glass having a thickness of 0.7 mm is bonded to a first pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer and a second non-alkali glass having a thickness of 0.7 mm is bonded to a second pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer with the pressure-sensitive adhesive layer interposed between the first non-alkali glass and the second non-alkali glass:
(1) the minimum transmittance is 75% or less, and
(2) a value obtained by dividing the maximum transmittance by the minimum transmittance is 1.15 or more.