Method for producing paper coating solution and coated paper coated with the paper coating solution produced by the method
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United States of America Patent
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Issued Date -
Feb 4, 2010
app pub date -
Oct 2, 2007
filing date -
Oct 2, 2006
priority date (Note) -
Abandoned
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Abstract
A coating solution comprising: (A) an aragonite-type light calcium carbonate microparticle having an average major axis diameter of 1.0 to 2.8 μm and an average minor axis diameter of 0.15 to 0.3 μm, which is produced by diluting a calcium hydroxide slurry that has been treated by high-speed shearing until the slurry has a viscosity of 1000 cP or more at a concentration of 400 g/l to a concentration more than 50 g/l and then blowing carbon dioxide into the diluted slurry at a reaction starting temperature of 20 to 60° C. and at a rate of 1 to 3 l/min per kg of calcium hydroxide; and (B) a pigment comprising a wet heavy calcium carbonate cake. The coating solution enables to provide a coated paper having an excellent degree of brilliance and an excellent degree of whiteness, despite containing no kaolin.
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