Clustered precipitated calcium carbonate particles

Details Clustered precipitated calcium carbonate particles Clustered precipitated calcium carbonate particles

C - Chemistry, Metallurgy

01

F

C01F 11/18 (2006.01) C09C 1/02 (2006.01) D21H 17/67 (2006.01) D21H 21/52 (2006.01)

Patent

CA 2133472

ABSTRACT OF THE DISCLOSURE Novel precipitated calcium carbonate particles in clustered form, which when used as fillers impart improved strength, opacity and other advantages to paper, are prepared by a process involving adding lime and carbon dioxide to a reaction mixture containing seed material having a scalenohedral morphology, the lime and carbon dioxide being added simultaneously. The flow rates of lime and carbon dioxide are adjusted to control the solution conductivity of the reaction mixture to between about 2.0 and about 4.0 mS to form the clusters of calcite particles, the clusters having an average equivalent spherical diameter of between about 1.5 and 305 microns and a specific surface area of between about 2.0 and 9.0 m2/g. At least about 25% of the particles of said clusters have a prismatic form.

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