Precipitated siliceous products and methods for their use...

Details Precipitated siliceous products and methods for their use... Precipitated siliceous products and methods for their use...

C - Chemistry, Metallurgy

01

B

23/194, 167/320.

C01B 33/12 (2006.01) A61K 8/25 (2006.01) A61K 47/02 (2006.01) A61Q 11/00 (2006.01) C01B 33/193 (2006.01) C08K 3/36 (2006.01) C09C 1/28 (2006.01) D21H 17/68 (2006.01)

Patent

CA 1093789

NOVEL PRECIPITATED SILICEOUS PRODUCTS AND METHODS FOR THEIR USE AND PRODUCTION ABSTRACT OF THE DISCLOSURE A method for producing a precipitated silicon dioxide is disclosed. The pigments are produced by acidulating a solution of an alkali metal silicate with an acid under controlled precipitation conditions. The aqueous reaction medium comprising the precipitated silica is then post conditioned by introducing a second silicate solution into the reaction vessel and thereafter adding additional acid to react with the said second silicate solution. A product is obtained which has a unique combination of physical and chemical properties including reduced wet cake moisture content, high surface areas and oil adsorptions, improved surface activity, friability, and wetting characteristics. The product has utility as a rubber reinforcing agent because of its increased surface activity and oil absorption. The product may be used in paints, paper, detergents, dentifrice compositions, molecular sieves, and polymeric compositions. In one particularly advantageous embodiment, an adduct material, such as aluminum, is added to control the refactive index and surface area of the product.

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