Electromagnetic wave absorber and electromagnetic wave absorber-attached molded article
US11806980B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2018 |
| Grant date | Nov 7, 2023 |
| Priority date | — |
| Expiry date | Mar 27, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2307/212
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An electromagnetic wave absorber (1) includes a dielectric layer (10), a resistive layer (20), and an electrically conductive layer (30). The resistive layer (20) is disposed on one principal surface of the dielectric layer (10). The electrically conductive layer (30) is disposed on the other principal surface of the dielectric layer (10) and has a sheet resistance lower than a sheet resistance of the resistive layer (20). The resistive layer (20) has a sheet resistance of 200 to 600Ω/□. When the resistive layer (20) is subjected to an immersion treatment in which the resistive layer (20) is immersed in a 5 weight % aqueous solution of NaOH for 5 minutes, an absolute value of a difference between a sheet resistance of the resistive layer (20) before the immersion treatment and a sheet resistance of the resistive layer (20) after the immersion treatment is less than 100Ω/□.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.