公开(公告)号：US20220056310A1

公开(公告)日：2022-02-24

申请号：US17417232

申请日：2019-12-23

Applicant: NITTO DENKO CORPORATION

Inventor： Hajime YAMAMOTO ,  Hiroki KIGAMI ,  Marie AIZUKA

IPC: C09J7/10 ,  C09J7/25 ,  C09J7/24

Abstract: An air-permeable adhesive sheet has air permeability in a thickness direction thereof and including an adhesive agent layer having first through holes extending in the thickness direction, wherein at least one surface of the adhesive agent layer forms an adhesive surface, the through holes have an average opening diameter of 1.0 to 50 μm and an average interval of 5 to 400 μm, and a variation in air permeability in the thickness direction is 22% or less as represented by a coefficient of variation of an air permeability measured according to Method B for air permeability measurement (Gurley method) specified in JIS L 1096: 2010, with an effective measurement area as a predetermined value selected from 0.5 to 2.0 mm2. The air-permeable adhesive sheet is a sheet capable of obtaining good characteristics such as air permeability even when being made into a sheet having a small area.