Solvay (societe Anonyme)

Imertech Sas

Imerys Sa

Gaëlle Rodary

Ferdinand Hardinghaus

Karine Cavalier

Didier Sy

Roberto Rosa

Marc Lacroix

Ardechir Momtaz

Jean-Raphael Caille

Karl Köhler

Julien Pineau

Benoît Lefevre

Christian Jourquin

Alkaline earth metal carbonate exhibiting a resistance to acids expressed as pH of less than 7 measured after suspending 1.0 g of the particles in a mixture made of 20 ml of toluene and 80 ml of an aqueous phase consisting of deionized water, 11.76 g/L of citric acid monohydrate, 2.57 g/L of NaCl and 0.068 mol/L of NaOH, after 35 minutes of stirring at 25&#xb0; C. and at 1 000 rpm, or expressed as a moisture pick-up lower than or equal to 2 g water/kg of calcium carbonate after one week of storage at 22&#xb0; C. and 50% relative humidity, or as a Differential Scanning Calorimetry (DSC) spectrum showing at least one peak between 170 and 190&#xb0; C. when measured at a heating rate of 10&#xb0; C./min under nitrogen atmosphere from 25 to 250&#xb0; C. in open cells. Process for the preparation of said particles, compositions containing said particles and the use thereof.

Acid resistant particles of an alkaline earth metal carbonate

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Gaëlle Rodary