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US 7,678,449 B2Granted
Iridescent magnetic effect pigments comprising a ferrite layer
AssigneeBASF Catalysts LLC
InventorSteven Jones
Life of this patent
Estimating the term…
Abstract
Iridescent magnetic pigments are produced by depositing a ferrite layer and a second metal oxide layer in succession on a substrate. The substrate may be platy and is coated with the ferrite, which is then coated with the second metal oxide layer to provide interference color effect. At least one of the layers is magnetic. The magnetic pigment may be used in coatings such as paints.
Claims21
A magnetic effect pigment comprising:
- (a) a substrate;
- (b) at least one ferrite layer deposited on said substrate;
- and
- (c) deposited on said ferrite layer, at least one non-ferrite metal oxide layer being an interference color imparting layer and being formed by calcination at about 600-800° C.
1 more element
A method of creating a magnetic pigment comprising the steps of:
- (a) providing a substrate;
- (b) coating a ferrite layer on the substrate;
- and
- (c) coating an interference color imparting layer containing a non-ferrite metal oxide on the ferrite layer, said non-ferrite metal oxide being formed by calcination at up to about 700° C.
1 more element
Dependencies are inferred from the claim text.