Coloured microstructured effect pigments
AssigneeMerck Patent Gesellschaft
InventorsReinhold Rüger, Kersten Dittmar, Johann Dietz, Ralf Tischer
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Abstract
Disclosed are colored flake-form effect pigments comprising one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, and to processes for the preparation thereof, and to the use thereof.
Claims28
Colored flake-form effect pigments comprising one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, wherein the groove or grid structure has 250 nm to 2000 nm separations between adjacent grooves or grids.
Colored flake-form effect pigments comprising one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, which comprise a colorless substrate layer comprising no colorants and having a groove or grid structure and to which one or more colorless layers or layers comprising no colorants have optionally been applied to at least one side, and which is encased with a polymer layer comprising one or more colorants, wherein the polymer is a crosslinked melamine-formaldehyde resin or a crosslinked polystyrene.
A process for preparing colored flake-form effect pigments comprising one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, comprising a) providing a body with a groove or grid structure which is coated with a colorless substrate layer or a substrate layer comprising no colorant, b) detaching the substrate layer from the body, and c) then optionally applying one or more colorless layers or layers comprising no colorants to the detached substrate layer, and d) then a polymer layer comprising one or more colorants is applied, wherein the polymer layer is formed by depositing crosslinking melamine-formaldehyde resins on the one or more layers, followed by curing or crosslinking of the melamine-formaldehyde resins.
A process for preparing colored flake-form effect pigments comprising one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, comprising a) providing a body with a groove or grid structure, which may be applied to a support, b) coating the body with one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant, and c) detaching the one or more layers from the body or separating the one or more layers from the support together with the body, wherein the groove or grid structure has 250 nm to 200 nm separations between adjacent grooves or grids.
Dependencies are inferred from the claim text.