Granular pigments
US6562120B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2002 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Jun 17, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/90
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a method for the preparation of pigment granules that are readily dispersible, robust, and have a reduced liability to dusting, preferably without the use of substantial quantities of binder, if any at all. The method comprises mixing at least one pigment selected from the group consisting of iron oxides, chromium oxides, cobalt blues, mixed metal oxides, carbon blacks and titanium oxides, with water to form a mixture having a dough-like consistency. The mixture is then extruded through at least one die to form extruded granules, thereby also compacting the mixture, which increases the strength of the granules. The extruded granules are then dried so that the final water content of the granules is less than substantially 5%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.