Bulking pigments

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C - Chemistry, Metallurgy

09

D

6/216, 134/41, 4

C09D 17/00 (2006.01) D21H 17/69 (2006.01) D21H 19/40 (2006.01)

Patent

CA 1312989

ABSTRACT A highly bulked kaolin pigment is prepared by mixing a small but effective amount of a water-soluble cationic polyelectrolyte flocculant with a kaolin clay pigment in the presence of water to prepare a bulked clay pigment product. Upon dewatering, the resultant polyelectrolyte treated clay product can be dispersed to form high solids clay-water slurries useful in making aqueous coating colors suitable for manufacturing coating lightweight publication papers or the pigment can be used as a filler for paper webs. Slurries having stable viscosity at elevated temperature are prepared by using as the dispersant a combination of a polyacrylate salt and a nonionic surfactant.

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