Patent · US Expired

EMI shielding pigments, a process for their preparation and their use

US5266109A · kind A · utility

7Cited by

5References

24Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Werner Voelker · Bad Vilbel, DE
Wilan Jerke · Bad Vilbel, DE
Kai Dorer · Heusenstamm, DE
Bernd Dorbath · Alzenau, DE
Karl-Anton Starz · Rodenbach, DE
Norbert Giesecke · Bruchköbel, DE

Key dates

Filing date	Jul 23, 1992
Grant date	Nov 30, 1993
Priority date	—
Expiry date	Jul 23, 2012

Classification

Technology area (CPC H)Electricity
CPC primaryH01B1/22
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.