Patent ID: 6342100
Filing Date: 2002-01-29
Classification: B82Y,C01F,C01P,C08K,C09C,C09D,C09K,Y10T

Abstract:
Coated crystalline calcium carbonate particles comprising calcium carbonate particles having coated and uncoated surface areas, wherein the coated surface area is in the form of a double layer and comprises 20 to 60% of the crystalline surface, said coated calcium carbonate being obtained by contacting uncoated calcium carbonate particles in an aqueous system with an amount of coating agent determined according to the equationcoating agent(g)=degree of coverage(g/m2)Ã—(5.99/(dÃ—dp))(m2/g)Ã—CaCO3(g) where (dp) represents the average particle diameter of the calcium carbonate particles, and (d) represents the density of the calcium carbonate.