Color travel oxidized aluminum pigments
US9243147B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2013 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Aug 8, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/66
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The oxidized aluminum pigment comprises not more than 95% by weight metallic aluminum, wherein the pigment is a flaky particle, and has a color travel from the hue angle range of about 50° to about 100° at the aspecular observation angle of 15° to a hue angle range of about 200° to about 270° at the aspecular observation angle of 110°. The oxidized aluminum pigment may be made by the steps of: providing a flaky aluminum pigment, and oxidizing the aluminum pigment in a water-in-oil emulsion comprising a surfactant in the presence of a base. The water-in-oil emulsion comprises a mixture of water dispersed in a hydrocarbon solvent. The aluminum pigment is predominantly in the hydrocarbon solvent during the oxidation step, and the amount of water in the mixture is in the range of about 5% to about 40% of the total weight of the emulsion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.