Patent ID: 8324301
Filing Date: 2012-12-04
Classification: B82Y,C01P,C09C,Y10T

Abstract:
1. A coated particle comprising an alkaline earth metal carbonate core coated with: a first coating agent selected from the group consisting of alkylsulfates, carboxylic acids, their salts, and mixtures thereof, and a second coating agent selected from the group consisting of alkylsulfates, carboxylic acids, their salts, and mixtures thereof, wherein said coated particle exhibits a resistance to acids such that when 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° C. and at 1 000 rpm, the pH value of the mixture is below 7.00.