EMI shielding pigments, a process for their preparation and thei

Details EMI shielding pigments, a process for their preparation and thei EMI shielding pigments, a process for their preparation and thei

1992-07-23

1993-11-30

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106457, 106456, 252514, C09C 124

Patent

active

052661091

ABSTRACT:
New electromagnetic interference (EMI) shielding pigments based on silver coated carrier pigments are disclosed which have a wider activity spectrum and are more economically available than previously known shielding pigments. The carrier pigments used are platelet shaped, ferro- or ferrimagnetic, Fe-containing, naturally occurring or synthetically produced laminar minerals. The Ag coating amounts to 5 to 25% by weight, based on the carrier pigment. Shielding pigments, which may be prepared by conventional chemical deposition of Ag or by sputtering, may be used for the production of EMI protective coatings and EMI protective films.

REFERENCES:
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patent: 4382981 (1983-05-01), Stoetzer et al.
patent: 4517118 (1985-05-01), Stoetzer
patent: 4518524 (1985-05-01), Stoetzer
patent: 4867795 (1989-09-01), Ostertag et al.
Patent abstract of Japan, vol. 12, No. 333, (C-526) to Agency of Ind. Science & Technol., Sep. 8, 1988.
Database WPIL, Derwent Publications Ltd., AN-89-359956 to Ishihara Sangyo Kaisha, Apr. 20, 1988.

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