High bulking pigment and method of making the same

Details High bulking pigment and method of making the same High bulking pigment and method of making the same

C - Chemistry, Metallurgy

09

C

6/211, 117/228

C09C 1/42 (2006.01) C09D 17/00 (2006.01) D21H 17/69 (2006.01) D21H 19/40 (2006.01)

Patent

CA 1275151

ABSTRACT OF THE DISCLOSURE A pigment comprising particles of uncalcined kaolin clay combined in the absence of a binder with an amount of an added source of zirconium ion, such as ammonium zirconium carbonate, at least sufficient to enhance optical character of a dried composition containing the pigment. In applica- tion, the pigment may be utilized in a coating for paper or other fibrous web substrate to produce sheet materials of enhanced opacity. Alternatively, the pigment may be employ- ed as a filler in a fibrous web substrate to provide improv- ed optical character of the material. Also disclosed is a method preparing a pigment, including preparing a dispersed slurry of clay particles in an aqueous medium, wherein the improvement comprises utilizing an uncalcined kaolin clay and introducing into the slurry in the absence of a binder the source of zirconium ion in an amount at least sufficient to enhance the optical character afforded by the pigment.

512406

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