Calcium carbonate pigments for coating paper and paper board

Details Calcium carbonate pigments for coating paper and paper board Calcium carbonate pigments for coating paper and paper board

1995-12-29

1997-10-14

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

106416, 106419, 106437, 106445, 106447, 106448, 106460, 106464, 106471, 106491, 162135, C09C 102

Patent

active

056767471

ABSTRACT:
A method for producing structured calcium carbonate pigments for coating paper is disclosed. An aqueous slurry of anionically dispersed calcium carbonate particles is formed at 1 to 30 percent solids. A low-molecular-weight cationically charged aggregating agent is then added to the slurry to selectively aggregate fine and ultra-fine particles. The resultant aggregates are of larger mean particle size than the mixture of particles in the original slurry and contain little or no fine and colloidal particles. The net charge present on the aggregated particles is lower than that of the original mineral particles. The low solids suspension of the aggregated mineral particles is then dewatered, or increased in solids to form a slurry with a solids content greater than 60 percent by weight.

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