	US 12,435,249 B2
	Method for separating joined object
Naofumi Kosaka, Ibaraki (JP); Yosuke Shimizu, Ibaraki (JP); and Kenta Kumakura, Ibaraki (JP)
Assigned to NITTO DENKO CORPORATION, Ibaraki (JP)
Appl. No. 18/040,474
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
PCT Filed Jul. 13, 2021, PCT No. PCT/JP2021/026290 § 371(c)(1), (2) Date Feb. 3, 2023, PCT Pub. No. WO2022/030198, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 2020-133217 (JP), filed on Aug. 5, 2020.
Prior Publication US 2023/0312990 A1, Oct. 5, 2023
Int. Cl. C09J 7/38 (2018.01); B32B 43/00 (2006.01)

CPC C09J 7/38 (2018.01) [B32B 43/006 (2013.01); C09J 2203/318 (2013.01); C09J 2301/302 (2020.08); C09J 2301/312 (2020.08); C09J 2301/416 (2020.08); C09J 2301/502 (2020.08); C09J 2400/143 (2013.01)]

12 Claims

1. A method for separating a joined object for display device, wherein

the joined object comprises two members of the display device which are joined with a pressure-sensitive adhesive comprising a hydrophilicity enhancer, the hydrophilicity enhancer being liquid at 25° C.,

the method comprises a step of peeling the pressure-sensitive adhesive from at least one of the two members by supplying steam towards the pressure-sensitive adhesive,

the steam is supplied by spraying, and

the steam has a temperature of 70° C. or higher and below 100° C. at a distance of 1 cm from a nozzle orifice discharging the steam.