Low brightness functional pigment from process by-product
US5190615A · kind A · utility
9Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1992 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Apr 27, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31993
- 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.