Patent ID: 8252413
Filing Date: 2012-08-28
Classification: C01F,C01P,D21H,Y10T

Abstract:
1. Light calcium carbonate in the form of microparticle aggregates of primary microparticles, each aggregate having a BET specific surface area not smaller than 10 m 2 /g and not larger than 25 m 2 /g, a pore volume of 0.05 cm 3 /g or larger for pores having a pore diameter up to 1000 Å as determined by the nitrogen adsorption method, and a pore volume ratio of 25% or more for pores having a pore diameter of 250 Å or smaller based on the total pore volume as determined by the nitrogen adsorption method, having an aggregate particle diameter of 4.0 to 6.0 μm and showing an oil absorption of 100 cc/100 g or more as determined by using liquid paraffin and wherein the primary particles have a particle diameter of 0.05 to 0.20 μm.