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US 10,479,901 B2Granted
Magnetic multilayer pigment flake and coating composition
AssigneeViavi Solutions Inc.
InventorsVladimir P. Raksha, Paul T. Kohlmann, Cornelis Jan Delst, Paul G. Coombs
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Abstract
The present invention provides a magnetic multilayer pigment flake and a magnetic coating composition that are relatively safe for human health and the environment. The pigment flake includes one or more magnetic layers of a magnetic alloy and one or more dielectric layers of a dielectric material. The magnetic alloy is an iron-chromium alloy or an iron-chromium-aluminum alloy, having a substantially nickel-free composition. The coating composition includes a plurality of the pigment flakes disposed in a binder medium.
Claims20
A symmetric pigment flake, comprising:
- a plurality of semi-transparent absorbing magnetic layers;
- a plurality of dielectric layers;
- and
- a plurality of opaque reflecting magnetic layers;
- and
- wherein two opaque reflecting magnetic layers of the plurality of opaque reflecting magnetic layers have a larger physical thickness than that of two other opaque reflecting magnetic layers.
3 more elements
Dependencies are inferred from the claim text.