US 12,457,724 B2
Electromagnetic wave absorbing sheet
Arinobu Katada, Tokyo (JP); Tomoko Yamagishi, Tokyo (JP); and Mitsugu Uejima, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 17/420,719
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed Jan. 28, 2020, PCT No. PCT/JP2020/002871
§ 371(c)(1), (2) Date Jul. 6, 2021,
PCT Pub. No. WO2020/158692, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-012300 (JP), filed on Jan. 28, 2019.
Prior Publication US 2022/0071068 A1, Mar. 3, 2022
Int. Cl. H05K 9/00 (2006.01); C01B 32/159 (2017.01); C01B 32/174 (2017.01)
CPC H05K 9/0071 (2013.01) [C01B 32/159 (2017.08); C01B 32/174 (2017.08)] 5 Claims
OG exemplary drawing
 
1. An electromagnetic wave absorbing sheet comprising: a sheet-shaped fibrous substrate; and a plurality of carbon nanotubes attached to the sheet-shaped fibrous substrate, wherein
the sheet-shaped fibrous substrate is a non-woven fabric,
an attached amount of the carbon nanotubes is 5 mass % or more and less than 70 mass %,
the carbon nanotubes are attached to fibers located at a surface of the non-woven fabric and the carbon nanotubes are attached to fibers located inward of the surface in a thickness direction of the non-woven fabric,
the electromagnetic wave absorbing sheet has a surface resistance of 20 Ω/sq. or more and 1,200 Ω/sq. or less, and
the sheet-shaped fibrous substrate is non-woven fabric having a basis weight of 2 g/m2 or more and 50 g/m2 or less.