Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Patent
1996-07-01
1997-12-09
Lewis, Michael
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
C01F 1118
Patent
active
056957335
ABSTRACT:
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 the lime and carbon dioxide are adjusted to control the solution conductivity of the reaction minute 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 3.5 microns and a specific surface area of between about 2.0 and 9.0 m.sup.2 /g. At least about 25% of the particles of said clusters have a prismatic form.
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Fairchild George H.
Kroc Vicki J.
Hendrickson Stuart L.
Lewis Michael
Minerals Technologies Inc.
Morris Terry B.
Powell Marvin J.
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