Precipitated calcium carbonate
US5558850A · kind A · utility
25Cited by
11References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1994 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Aug 9, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The calcium carbonate is prepared by: PA0 (a) slaking quicklime in an aqueous medium; PA0 (b) carbonating and neutralising the suspension of slaked lime formed in step (a) using a gas comprising carbon dioxide; and PA0 (c) separating the precipitated calcium carbonate formed in step (b) from the aqueous medium in which it is suspended. There is added 0.1% to 2% by weight, based on the weight of dry calcium oxide, of a reagent having one or more active hydrogen atoms (or a salt thereof), to the aqueous medium in which the quicklime is slaked in step (a).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.