Composite titania-calcined kaolin opacifying pigments and method

Details Composite titania-calcined kaolin opacifying pigments and method Composite titania-calcined kaolin opacifying pigments and method

1991-05-08

1992-10-06

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

106416, 106417, 106436, 106442, 106446, 106447, C09C 136

Patent

active

051528355

ABSTRACT:
Novel titania-calcined kaolin composite pigments wherein structuring and adhesion of titania and calcined kaolin particles is achieved by use of a cationic polyelectrolyte. Methods for compositing titania and calcined kaolin pigments which feature the presence of at least one polyanionic dispersant (such as sodium polyacrylate, sodium silicate, sodium condensed phosphate or mixtures thereof) in the pigment slurry into which cationic polyelectrolyte is introduced and the use of strongly alkaline pH (e.g., above 9).

REFERENCES:
patent: 3726700 (1973-04-01), Wildt
patent: 3846147 (1974-11-01), Tapper
patent: 4738726 (1988-04-01), Pratt et al.
patent: 5078793 (1992-01-01), Caton
Hawley's Condensed Chemical Dictionary, 11th Ed., Van Nostrand Rheinhold, 1987, pp. 232, 528.

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