Opacifying kaolin pigments and process for making same by reacting with sodium hydroxide in water
US5089056A · kind A · utility
8Cited by
30References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1989 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Apr 21, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An opacifying pigment with enhanced light scattering properties for use as a paper coating or filler material is produced by reacting kaolin in the presence of water with sodium hydroxide or potassium hydroxide at a temperature in excess of 60.degree. C. The kaolin is reacted with the hydroxide in a concentration to produce a molality of at least 0.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.