METHOD FOR PRODUCING PAPER COATING SOLUTION AND COATED PAPER COATED WITH THE PAPER COATING SOLUTION PRODUCED BY THE METHOD

摘要

A coating solution comprising: (A) an aragonite-type light calcium carbonate microparticle having an average major axis diameter of 1.0 to 2.8 m and an average minor axis diameter of 0.15 to 0.3 m, 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 60ºC 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.