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专利名称：Precipitated siliceous products used in
paper
发明人：Satish K. Wason,Robert K. Mays申请号：US05/949720申请日：19781010公开号：US04260454A公开日：19810407
摘要：A method for producing a precipitated silicon dioxide having a new combinationof physical and chemical properties is disclosed. The pigments are produced by
acidulating a solution of an alkali metal silicate with an acid under controlled precipitationconditions. 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. By varyingthe amount of the silicate employed in the post-conditioning step, a product is obtainedwhich has a unique combination of physical and chemical properties including reducedwet cake moisture content, high surface areas and oil absorptions, improved surfaceactivity, friability, wetting characteristics, and the like. The product has particular utilityfor use as a rubber reinforcing agent because of its increased surface activity and oilabsorption, etc. The product, however, may be used in paints, paper, detergents,dentifrice compositions, molecular sieves, and polymeric compositions. An unexpecteddiscovery of the invention involves the production of a rubber reinforcing silica which hasa decreased wet cake moisture content. In one particularly advantageous embodiment,an adduct material, such as aluminum, is added to control the refractive index and surface
area of the product.
申请人：J. M. HUBER CORPORATION
代理人：Robert L. Price,Ernest A. Schaal,Harold H. Flanders
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