Rhone-poulenc Chimie

Claude Richard

Adrien Dromard

Stable aqueous suspensions of precipitated silica, well adopted as coatings for the papermaking industry, include an aqueous suspension of a slaked precipitated silica filter cake and an effective amount of a stabilizer therefor, which stabilizer contains (a) aluminum or an aluminum compound, and (b) an anionic dispersing agent.

Aqueous suspensions of precipitated silica with anionic dispersant and

Stable, non-gelling and pumpable aqueous suspensions of precipitated silica particulates, well adapted for the coating of paper and cardboard substrates, include an effective stabilizing amount of at least one biogum heteropolysaccharide and at least one quaternary ammonium, sulfonium or phosphonium compound (cationic surfactant).

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Lyons, France

Claude Richard