US 12,446,201 B2
Electromagnetic wave noise suppression sheet and method for manufacturing the same
Hideaki Komiyama, Nagaoka (JP); and Atsushi Tamura, Nagaoka (JP)
Assigned to HOKUETSU CORPORATION, Nagaoka (JP)
Appl. No. 18/275,376
Filed by HOKUETSU CORPORATION, Nagaoka (JP)
PCT Filed Mar. 19, 2021, PCT No. PCT/JP2021/011477
§ 371(c)(1), (2) Date Aug. 1, 2023,
PCT Pub. No. WO2022/195871, PCT Pub. Date Sep. 22, 2022.
Prior Publication US 2024/0107733 A1, Mar. 28, 2024
Int. Cl. H05K 9/00 (2006.01); C08J 5/18 (2006.01); C08J 7/04 (2020.01); C08K 3/04 (2006.01); C08K 3/34 (2006.01)
CPC H05K 9/009 (2013.01) [C08J 5/18 (2013.01); C08J 7/0427 (2020.01); C08K 3/041 (2017.05); C08K 3/042 (2017.05); C08K 3/346 (2013.01); C08J 2301/28 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electromagnetic wave noise suppression sheet comprising:
a first layer consisting of carbon nanotubes, an inorganic filler, and sodium carboxymethylcellulose, and optionally thickener selected from the group consisting of celluloses and ammonium salts or alkali metal salts thereof, polycarboxylic acids and alkali metal salts thereof, a polyvinyl alcohol-based (co) polymer, a saponified product of a copolymer of unsaturated carboxylic acid with vinyl ester, and a polyacrylamide-based copolymer, wherein
the inorganic filler is at least one selected from the group consisting of graphite, carbon black, and an inorganic pigment, and
a ratio of a mass of the inorganic filler to a mass of the carbon nanotubes is ¼ or more and 2 or less.