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US 6,582,781 B1Granted
Multilayer cholesteric pigments
AssigneeBASF SE
InventorsPeter Schuhmacher, Norbert Schneider, Volker Richter, Harald Keller, Günter Bettinger, Peter Blaschka, Peter Heilmann, Frank Meyer, Wolfgang Best
Life of this patent
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Abstract
A platelet-shaped cholesteric multilayer pigment which comprises the layer sequence A1/B/A2 where A1 and A2 are identical or different and each comprise at least one cholesteric layer, and B is at least one interlayer which separates the layers A1 and A2 from one another and which absorbs all or some of the light transmitted by the layers A1 and A2, processes for its preparation, and its use are all described.
Claims14
A platelet-shaped cholesteric multilayer pigment which comprises the layer sequence A1/B/A2,
- wherein
- A1 and A2 are identical or different and each comprise at least one cholesteric layer wherein the thickness of each cholesteric layer is about 0.5 to 2 μm, and
- B is at least one interlayer which separates the layers A1 and A2 from one another and which absorbs all or some of the light transmitted by the layers A1 and A2.
Dependencies are inferred from the claim text.