Abstract: Dispersions of titanium dioxide pigments with improved long-term resistance to pigment settling and precipitation are disclosed. The pigment dispersions are formed by chemically grafting vinyl and/or acrylic polymers to nitrocellulose in dispersions of nitrocellulose and titanium dioxide pigments. Nitrocellulose forms a loose association with titanium dioxide in dispersion. The chemical grafting improves the precipitation and settling resistance of nitrocellulose, and thus the precipitation and settling resistance of the associated titanium dioxide.
Type:
Grant
Filed:
June 25, 1985
Date of Patent:
July 28, 1987
Assignee:
Forsythe Cosmetic Group, Ltd.
Inventors:
Carl Horowitz, John M. Ryan, Mohan L. Sanduja, Kenneth K. Sugathan, Paulose P. Thottathil