Precipitated calcium carbonate, a method for its manufacture and uses thereof
AssigneeImerys
InventorsJean-Luc Rico, Cédric Raboteau, Alexandra Jakob
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Abstract
Dry precipitated calcium carbonate and a slurry of precipitated calcium carbonate (“PCC”) particles at least partially in the form elongated entities, especially of nanofibers or nanochain like agglomerates constituted by at least two interconnected primary particles, and preferably, with a content of scalenohedron particles, is provided having opacifying properties. The slurry may be produced on site of its use and, due to its high concentration of CaCO3, may be applied directly after its manufacture.
Claims18
A precipitated calcium carbonate comprising scalenohedron particles and
- particles which are at least partially in the form of nanofibers or nanochain like agglomerates constituted by at least two interconnected primary particles, wherein
- at least a part of the scalenohedron particles and the nanofibers or nanochain like agglomerates form microshells.
A process for the manufacture of precipitated calcium carbonate which is suitable as opacifier, which process comprises
- a) reacting CaO with water to form dry Ca(OH)2,
- b) contacting the dry Ca(OH)2 of step a) with water to form a slurry;
- and
- c) carbonating the slurry of Ca(OH)2 from step b) with CO2 to form scalenohedron particles.
Dependencies are inferred from the claim text.