Compositions – Electrically conductive or emissive compositions – Free metal containing
Patent
1998-08-19
2000-01-11
Gupta, Yogendra
Compositions
Electrically conductive or emissive compositions
Free metal containing
252514, H01B 122
Patent
active
060132035
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 components and electronic components made using the method and paint composition of the invention.
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Chasse Mark P.
Paneccasio, Jr. Vincent
Enthone-OMI Inc.
Gupta Yogendra
Hamlin D G
Mueller Richard P.
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