Surface-reacted precipitated calcium carbonate, process to make same, and uses thereof
US10280309B2 · kind B2 · utility
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Key dates
| Filing date | Dec 2, 2008 |
| Grant date | May 7, 2019 |
| Priority date | — |
| Expiry date | Mar 3, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of a surface-reacted precipitated calcium carbonate (PCC) pigment having an insoluble, at least partially crystalline calcium salt on its surface. In the process of the present invention, a PCC containing pigment is contacted with H3O+ ions and a solubilized anion in an aqueous medium in the presence of excess solubilized calcium ions to form the surface-reacted PCC having an insoluble, at least partially crystalline calcium salt of the anion formed on its surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.