Aqueous dispersions

Details Aqueous dispersions Aqueous dispersions

C - Chemistry, Metallurgy

09

C

134/46

C09C 1/36 (2006.01) C09D 17/00 (2006.01)

Patent

CA 1151499

CASE 383 ABSTRACT AQUEOUS DISPERSIONS Aqueous pastes have been prepared by dispersing dried particulate material in water in the presence of a dispersing agent. A new process for the manufacture of aqueous pastes involves two-stage filtration in which a first stage filter cake is mixed with a dispersing agent in an amount sufficient to render the cake free-flowing which is then subjected to a second stage pressure filtration and the cake is then homogenised. Preferably the cake is of titanium dioxide and the cake from the first filtration is mixed with the dispersing agent in a sand mill. A membrane pressure filter is preferably used in the first and second filtration stages. During homogenisation preferably a further amount of the dispersing agent is mixed with the filter cake. Aqueous paste prepared by this new process can have solids contents in excess of 70% by weight.

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