Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
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, 106465, 106471, 106491, 162135, C09C 102
Patent
active
056767480
ABSTRACT:
A method for producing bulking and opacifying kaolin fillers for filling cellulosic products is disclosed. An aqueous slurry of anionically dispersed kaolin particles is formed at 1 to 30% solids. A low-molecular-weight cationic aggregating agent is then added to the dispersed slurry to selectively aggregate fine and ultra-fine particles. The resultant aggregates are of larger mean particle size than the feed material and contain little or no fine and ultra-fine or colloidal particles. The net charge present on the aggregated particles is lower than that of the feed material. The aggregated structure contains within it a labyrinth of internal voids or pores. These mineral aggregates are then of a suitable size and surface charge to be retained well in a fiber web, and provide added bulk and opacity to the cellulosic products.
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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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