Topic
Precipitated silica
About: Precipitated silica is a research topic. Over the lifetime, 1401 publications have been published within this topic receiving 20992 citations.
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24 Nov 2004
TL;DR: In this article, an in situ, simultaneously produced precipitated silica/silica gel combination provides such unexpectedly effective low abrasion and high cleaning capability and different thickening characteristics as compared to physical mixtures of such components.
Abstract: Unique abrasive and/or thickening materials that are in situ generated compositions of precipitated silicas and silica gels are provided. Such compositions exhibit different beneficial characteristics depending on the structure of the composite in situ generated material. With low structured composites (as measured via linseed oil absorption levels from 40 to 100 ml oil absorbed/100 g composite), simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels are possible in order to accord the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces. Increased amounts of high structure composite materials tend to accord greater viscosity build and thickening benefits together with such desirable abrasion and cleaning properties, albeit to a lesser extent than for the low structure types. Thus, mid-range cleaning materials will exhibit oil absorption levels from an excess of 100 to 150, and high thickening/low abrasion composite exhibit oil absorption properties in excess of 150. Such an in situ, simultaneously produced precipitated silica/silica gel combination provides such unexpectedly effective low abrasion and high cleaning capability and different thickening characteristics as compared to physical mixtures of such components. Encompassed within this invention is a unique method for making such gel/precipitated silica composite materials for such a purpose, as well as the different materials within the structure ranges described above and dentifrices comprising such.
12 citations
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22 Dec 1969
TL;DR: PRECIPITATED SILICA PIGMENTS are PELLETIZED EMPLOYING from about 0.25 to about 3.0 percent by WEIGHT of a SURFACE ACTIVE AGENT AS A BINDING AGENT as mentioned in this paper.
Abstract: PRECIPITATED SILICA PIGMENTS ARE PELLETIZED EMPLOYING FROM ABOUT 0.25 TO ABOUT 3.0 PERCENT BY WEIGHT OF A SURFACE ACTIVE AGENT AS A BINDING AGENT. THE BOLK DENSITY OF THE SILICA IS THEREBY INCREASED, AND BY MEANS OF THESE PELLETS THE SILICA CAN BE INCORPORATED INTO RUBBER MUCH FASTER AND WITH GREATLY REDUCED FLY-LOSS.
12 citations
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TL;DR: In this paper, results of the paper coating and printing trials are presented and discussed, in terms of their contribution to the coating color rheology and coated and printed paper quality.
Abstract: Ink‐jet (IJ) printing is a fast developing non‐impact printing technique, which depends on three key parameters: e.g. paper, printer, and ink. Surface of the papers for high‐end segment is treated with coatings consisting of specialty pigments, such as silica, precipitated calcium carbonate (PCC) and polyvinyl alcohol (PVOH). Fumed and precipitated silica and PCC are known for their high‐specific surface area, quick water absorption and high fidelity of IJ prints. In this article, results of our paper coating and printing trials are presented and discussed. Behaviour of individual pigments is examined in terms of their contribution to the coating colour rheology and coated and printed paper quality. Advantages of silica‐based pigments and their disadvantages in comparison with PCC are pointed out.
12 citations
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20 Nov 1987TL;DR: In this article, dry set mortar compositions have improved non-sag properties, while retaining properties such as workability, adhesion and long open time, achieved by the use of finely divided silica such as fumed or precipitated silica, as an anti-Sag agent in combination with certain carbohydrate polymers, as water retention agents such as cellulose ethers or mixtures thereof with natural gums, such as the polygalactomannan gums.
Abstract: Disclosed are dry set mortar compositions having improved non-sag properties, while retaining properties such as workability, adhesion and long open time. In particular, these properties are achieved by the use of finely divided silica, such as fumed or precipitated silica, as an anti-sag agent in combination with certain carbohydrate polymers, as water retention agents such as cellulose ethers or mixtures thereof with natural gums, such as the polygalactomannan gums. The mortar composition is also comprised of the usual Portland cement and an inert filler such as sand and may also contain latex binders found in many conventional mortar compositions.
12 citations