Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1995-11-16
1997-08-05
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, 106465, 106471, 106491, 106499, 162135, 162158, 162162, 1621811, 1621814, 162183, C09C 102
Patent
active
056537956
ABSTRACT:
A method is disclosed for producing bulking and opacifying pigments for filling paper by the selective aggregation of fine particles in an anionically or cationically dispersed slurry, such that an aggregated structure is formed which contains within it a labyrinth of internal voids or pores. The aqueous slurry is formed at one to thirty percent solids. A low molecular weight agent of opposite ionic charge is then added to the slurry to selectively aggregate the fine particles present. The resultant aggregates are of larger mean particle size than the feed material and contain little or no fine and colloidal particles. The net charge present on the aggregated particles is lower than that of the feed material.
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Passaretti, et al., "Application of High-Opacity Precipitated Calcium Carbonate," Tappi Journal 76:135-140 (1993) (No Month).
Bell Mark L.
Columbia River Carbonates
Hertzog Scott L.
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