Structured pigment from high TiO.sub.2 /Fe.sub.2 O.sub.3 kaolinite reject material
US5147458A · kind A · utility
7Cited by
4References
6Claims
0Family size
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Key dates
| Filing date | Jan 18, 1991 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Jan 18, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/82
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A low brightness pigment and method is provided from a heretofore rejected waste kaolin stream. Kaolin processing rejects are high in iron-stained TiO.sub.2. After separating the stained TiO.sub.2 from the high brightness kaolin and concentrating the resulting fraction, the material can be processed to produce a low brightness pigment suitable of many applications where lower brightness is desirable, such as coating paper board without mottling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.