HIGH CONCN. LOW VISCOSITY CALCIUM CARBONATE AQUEOUS DISPERSION AND COATING COMPOSITION THEREFOR

摘要

PURPOSE:To obtain the high concn. low viscosity calcium carbonate aqueous dispersion by compounding a dispersant and an inorg. electrolyte to two kinds of calcium carbonates which have specific uniform particle sizes and a particle shapes respectively and of which particle sizes are differet to each other. CONSTITUTION:To 100pts.wt. mixed calcium carbonate consisting of 60-95wt% precipitated calcium carbonateIwith an average particle size of 0.1-1mum and 5-40wt% precipitated calcium carbonate II having an average particle size 0.2-0.8 times of the above described average particle size, 0.1-10pts.wt. high molecular polycarboxilic acid type dispersant such as polyacrilic acid or the like and 0.01-10pts.wt. inorg. electrolyte such as calcium hydroxide or the like are compounded. By this method, filling density of mutual calcium carbonate particles is enhanced and the high concn. low viscosity calcium carbonate aqueous dispersion is obtained.