Process for preparing calcium carbonate

Details Process for preparing calcium carbonate Process for preparing calcium carbonate

1997-09-08

1999-06-08

Marcheschi, Michael

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

423432, 4234191, C09C 102, C01F 524

Patent

active

059102144

ABSTRACT:
A process for producing calcium carbonate particles having an average size of 0.3.+-.0.1 .mu.m, the process comprising the steps of preparing light calcium carbonate particles of 0.6.+-.0.4 .mu.m in average size by carbonating calcium hydroxide suspended in water, drying and pulverizing the light calcium carbonate particles, admixing the dry powders thereof with a dispersing agent, and wet-grinding the slurry. The final product imparts high opacity and brightness to coated papers when it is used as a pigment.

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patent: 5750086 (1998-05-01), You
patent: 5833747 (1998-11-01), Bleakley et al.

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