Coatings for EMI/RFI shielding
US6013203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Aug 19, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/095
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electrically conductive paint for providing EMI/RFI shielding for housings of electronics components comprises a cross-linked organic resin binder containing cross-linkable functional groups such as OH groups, electrically conductive metallic particles, preferably a mixture of silver flakes and silver-coated copper flakes, a solvent, a cross-linking agent which cross-links with itself and with the functional groups of the organic binder and preferably a catalyst which accelerates cross-linking of the cross-linking agent and organic binder. Using such a paint formulation it has been found that thinner coatings can be used while still exceeding the properties needed for EMI/RFI shielding of housing for electronic components. A rheological additive which is an organic derivative of castor oil is preferably used to control the viscosity and spraying characteristics of the paint especially in a paint composition containing silver coated copper flakes. The conductive paint provides a sprayed coating which is durable, has low resistivity and is smooth and has both cohesive and adhesive strength. A method is also provided for forming EMI/RFI shielding on housings for electronic componen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.