Granular pigments useful to color concrete
US6758893B2 · kind B2 · utility
2Cited by
2References
17Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 20, 2002 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Jun 20, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/54
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for the preparation of pigment granules includes mixing at least one pigment selected from the group consisting of iron oxide and chromium oxides with 1-25 wt. % water to form a damp powder. The damp powder is then pressure extruded through at least one die to form granules. The granules are then dried so that the final water content of the granules is less than about 1%, crumble and sieved to form the final product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.