Cationically processed calcined kaolin clay
US5112782A · kind A · utility
39Cited by
30References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1991 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | May 23, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for producing a low abrasion calcined kaolin pigment which comprises forming an aqueous pulp of crude kaolin dispersing the pulp by adding thereto sufficient water-soluble organic cationic dispersant to impart a positive zeta potential to said particles and, preferably, an acidic pH to said pulp, removing coarse particles from said dispersed pulp and fractionating the dispersed pulp to separate a fine particle size fraction of mineral particles from coarser particles. The fine particle size fraction is dried, pulverized, calcined and repulverized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.