After coating of pearl luster pigments with hydrophobic coupling reagents
US6488757B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 2001 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | Nov 6, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/84
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a pearl luster pigment on the basis of a platelet-shaped substrate coated with metal oxides and a top layer which is located on the metal oxide layer and can possess a multilayer structure, comprising a first layer, containing a hydroxide or oxide hydrate of the elements aluminum or silicon, a second layer, containing at least one hydroxide or oxide hydrate of the elements aluminum, silicon, cerium or zirconium, with the exception of the hydroxide or oxide hydrate which forms the first layer, and a third layer, containing at least one organic hydrophobic coupling agent. The present invention also relates to a preparation process and the use of pigments in paints, inks, plastics, coatings and cosmetics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.