Oxidized colored aluminium pigments, process for their production and their use
AssigneeEckart-Werke Standard Bronzepulver-Werke Carl Eckart GmbH & Co.
InventorWolfgang Reisser
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Abstract
The invention concerns oxidised aluminium or aluminium alloy pigments having a content of metallic aluminium of not more than 90% by weight with respect to the total weight, wherein the pigments are colored, flake-like, shiny and non-agglomerated, a process for the production thereof and use thereof as special-effect pigments and as base pigments for further colouring with organic or inorganic color pigments.
Claims28
An oxidized aluminum pigment, having a content of metallic aluminum of not more than 90% by weight with respect to total weight, wherein the pigment is colored, shiny, non-agglomerated, has a flaked particle configuration and, contains a substantially homogeneous oxide layer of a substantially uniform thickness.
A process for the production an oxidized aluminum pigment, comprising:
- oxidizing an aluminum pigment having a flaked particle configuration at a pH of between 7 and 12 in a mixture of water and at least one water-miscible solvent, wherein the proportion of water in the mixture is between 3% and 60% by weight with respect to the mixture, and wherein the amount of water in the mixture is between 10 and 120% by weight with respect to the metal,
- thereby providing an oxidized aluminum pigment having a content of metallic aluminum of not more than 90% by weight with respect to the total weight of the pigment.
An oxidized aluminum pigment, having a content of metallic aluminum of not more than 90% by weight with respect to the total weight, wherein the pigment is shiny and non-agglomerated, has a flaked particle configuration, contains a substantially homogeneous oxide layer of a substantially uniform thickness, and is of a color in the range from nickel, light-gold, gold, dark-gold, to bronze.
Dependencies are inferred from the claim text.