Light calcium carbonate, process for producing the same, and printing paper containing the same
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United States of America Patent
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Aug 28, 2012
Grant Date -
Mar 18, 2010
app pub date -
Nov 28, 2007
filing date -
Nov 30, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The light calcium carbonate in the form of microparticle aggregate of the present invention has a BET specific surface area not smaller than 10 m2/g and not larger than 25 m2/g, a pore volume of 0.05 cm3/g or larger for pores having a pore diameter of 0 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, and shows an oil absorption of 100 cc/100 g or more as determined by using liquid paraffin. By using this light calcium carbonate as a filler of printing paper, superior ink absorbing property and opacity (especially opacity after printing) can be imparted to the printing paper.
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