US 12,120,832 B2
Air-permeable member with removable protective film for covering ventilation hole
Hiroki Kigami, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Osaka (JP)
Appl. No. 17/442,242
Filed by NITTO DENKO CORPORATION, Osaka (JP)
PCT Filed Mar. 18, 2020, PCT No. PCT/JP2020/012161
§ 371(c)(1), (2) Date Sep. 23, 2021,
PCT Pub. No. WO2020/196211, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-059433 (JP), filed on Mar. 26, 2019.
Prior Publication US 2022/0159852 A1, May 19, 2022
Int. Cl. H05K 5/02 (2006.01); B01D 63/08 (2006.01); B01D 65/00 (2006.01); B01D 69/10 (2006.01); B01D 71/36 (2006.01)
CPC H05K 5/0214 (2022.08) [B01D 63/081 (2013.01); B01D 65/003 (2013.01); B01D 69/1071 (2022.08); B01D 71/36 (2013.01); H05K 5/0213 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A member for a ventilation hole, the member to be placed to cover a ventilation hole in order to allow passage of gas between an outside and an inside of a housing through the ventilation hole of the housing and prevent dust and/or a liquid from entering the inside from the outside through the ventilation hole, the member comprising:
a porous membrane having air permeability in a thickness direction; and
a provisional protective film joined to the porous membrane to cover the porous membrane from the outside side, wherein
the provisional protective film is air-impermeable in a thickness direction or has lower air permeability in the thickness direction than the air permeability of the porous membrane,
the provisional protective film and the porous membrane are joined to each other in such a manner that the provisional protective film is removable from the porous membrane,
wherein the provisional protective film is joined to the porous membrane with an adhesive whose adhesive strength decreases by an external stimulus, and
wherein the external stimulus is heat and/or light.