Class 516/82 - The silica is formed or grown by reaction of alkali silicate and non-siliceous inorganic acid (e.g., H2SO4)

Subclass of Class 516 - Colloid systems and wetting agents; subcombinations thereof; processes of
Definition: Subject matter in which said substantially pure silica is
No. of patents: 35
Last issue date: 03/09/2010

Number	Title	Issue Date
7674833	Composition prepared from silica sol and mineral acid The present invention relates to a method of preparing a composition comprising mixing a silica sol having an S-value from about 5 to about 50% and a mineral acid. The invention also relates to a composition obtainable by the method and a composition comprising a ne...	03/09/2010
7270803	High-cleaning, low abrasion, high brightness silica materials for dentrifices Unique abrasive materials that are in situ generated compositions of precipitated silicas and silica gels are provided. Such compositions exhibit different beneficial, particularly simultaneously high pellicle film cleaning properties and moderate dentin abrasion le...	09/18/2007
7267814	High-cleaning/low abrasive silica and materials and dentifrice containing such materials 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 mat...	09/11/2007
7255852	Precipitated silica product, dentifrices containing same, and processes Precipitated silica comprising porous silica particles having a cumulative surface area for all pores having diameters greater than 500 Å of less than 8 m2/g, as measured by mercury intrusion, and a percentage cetylpyridinium chloride (% CPC) Compatibil...	08/14/2007
7169261	Silica-based sols An aqueous sol containing silica-based particles which has an S-value within the range of from 10 to 45%, a viscosity within the range of from 5 to 40 cP, and a molar ratio of SiO2 to M2O, where M is alkali metal or ammonium, within the range o...	01/30/2007
7163358	Injection grouting The invention relates to the use of a composition for injection grouting obtainable by mixing an alkali metal silicate or an organic silicate, colloidal silica particles, and at least one gelling agent, wherein the weight ratio of colloidal silica to silicate is fro...	01/16/2007
7135429	Attrition resistant carrier product The present invention is directed to an attrition resistant carrier product such as silica. Further, this invention is directed to the use of a binder to improve the attrition resistance or reduce the friability of a carrier product such as silica. In an embodiment,...	11/14/2006
7015254	Description of an inorganic polymer “electret ”in a colloidal state along with the method of generating and applications The present invention includes an apparatus for generating an inorganic polymer electret in a colloidal state, the inorganic electret in a colloidal state itself, and applications for the inorganic electret in a colloidal state. The invention includes a method for g...	03/21/2006
6946119	Precipitated silica product with low surface area, dentifrices containing same, and processes Precipitated silica product having low surface area and enhanced flavor compatibility. The precipitated silica product is especially well-adapted for use in dentifrices containing cetylpyridinium chloride, which do not attach to the low surface area silica product i...	09/20/2005
6903040	Continuous process and apparatus for the efficient conversion of inorganic solid particles The invention pertains to a continuous process for the conversion of inorganic solid starting particles which either are amorphous or possess a degree of order into inorganic solid product particles which (a) when the starting particles are amorphous, p...	06/07/2005
6869256	Sealing composition and its use A method for sealing rock or soil comprising inserting a sealing composition obtained by mixing a silica sol and at least one gelling agent, wherein the silica sol has an S-value higher than about 72%, a method for preparing the sealing composition and the compositi...	03/22/2005
6857824	Sealing composition and its use The present invention relates to a method for sealing rock or soil comprising inserting a sealing composition obtained by mixing a silica sol and at least one gelling agent, wherein the silica sol has an S-value higher than about 72%, a method for preparing the seal...	02/22/2005
6569908	Dispersion of silica particle agglomerates and process for producing the same The present invention also provides a process for producing a colloidal dispersion of silica particle agglomerates having a specific surface area, as determined by nitrogen adsorption method, of 100 m2 /g to 400 m2 /g, an average sec...	05/27/2003
6486216	Stable colloidal silica aquasols A stable aquasol containing colloidal silica having a surface area of from about 700 m2 /g to about 1100 m2 /g, and an S-value of from about 20 to about 50; wherein the colloidal silica is not surface treated; wherein the molar ratio...	11/26/2002
6372806	Method of making colloidal silica Disclosed are stable, aqueous colloidal silicas having surface area of greater than 700 m2 /g and S-values of from 20-50. These colloidal silicas do not require treatment with surface treatment agents such as aluminum to achieve stability. Thes...	04/16/2002
6210751	Process for preparing organically modified aerogels in which the salts formed are precipitated out The present invention relates to a process for the preparation of organically modified aerogels, comprising a) the preparation of a silicic acid sol having a pH of ࣘ4.0 from an aqueous water glass solution, with the aid of at least one organic and/or in...	04/03/2001
6068694	Silica based aggregates, elastomers reinforced therewith and tire with tread thereof This invention relates to aggregates comprised of particles which contain silicon dioxide and to elastomers reinforced therewith. The invention also relates to tires having treads composed of such reinforced elastomers....	05/30/2000
5964693	Continuous preparation of silica sols which contain large particles A process is provided for the preparation of aqueous silica sols having a particle size of 27 to 72 nm. by adding fresh acidic silica sol into the reactors of a multi stage cascade reactor wherein the reactors contain aqueous solution of colloidal silica ...	10/12/1999
5866027	Process for producing fiber-reinforced xerogels and their use The invention relates to a process for producing modified, fiber-reinforced xerogels having porosities greater than 60% and xerogel matrix densities below 0.6 g/cm3 and to their use as thermal insulating material....	02/02/1999
5738801	Hydrophobic silica aerogels Hydrophobic silica aerogels obtainable by reacting a waterglass solution with an acid at a pH of from 7.5 to 11, substantially removing ionic constituents from the resulting silica hydrogels by washing with water or dilute aqueous solutions of inorganic b...	04/14/1998
5695730	Process for preparing silicic acid hydrate The present invention provides silicic acid hydrate having a large pore volume and tiny particle diameters, and a process for preparing it. There is disclosed silicic acid hydrate obtained by neutralizing an aqueous solution of sodium silicate with a mine...	12/09/1997
5647903	Microporous high structure precipitated silicas and methods Precipitated silicas having wet cake moisture values in excess of 85%, BET surface areas of 600-700 m2 /g, oil absorption values of 50 to 60 cc/100 g, total intruded volume of about 1.2 to 0.8 cc/g, and a median pore radius of 50 Å to 20 Å ar...	07/15/1997
5571494	Temperature-activated polysilicic acids A temperature-activated polysilicic acid is prepared by heating an acidified aqueous alkali metal silicate. The temperature-activated polysilicic acid is used in the production of paper for improvement of retention and water removal....	11/05/1996
5447604	Silica sols, a process for the production of silica sols and use of the sols Silica sols which have a large alkali excess, i.e. a low molar ratio SiO2 to M2 O, and which contain silica particles with a high specific surface area. The silica sols can be prepared through acidification of a water glass solution ...	09/05/1995
5368833	Silica sols having high surface area Silica sols having a high content of microgel and aluminum modified particles with high specific surface area. The sols can be prepared by a process comprising acidification of a water glass solution, alkalization at a certain dry substance content, parti...	11/29/1994
5279807	Method for preparing low-concentration polysilicate microgels An improved method and apparatus for preparing low-concentration polysilicate microgels from a water soluble silicate and a strong acid in which the silicate and acid are mixed at a rate to produce a Reynolds number of at least 4000, the mixture is aged a...	01/18/1994
5236623	Process for the production of a silica colloid Silica colloids having a spherical form, a mean diameter of between about 10 and 100 nm and a polydispersity index between about 1 and 4. A process for making silica colloids is also provided comprising a) forming a reaction medium by simultaneously addin...	08/17/1993
5100581	Method of preparing high-purity aqueous silica sol A high-purity stable aqueous silica sol is prepared which has an SiO2 concentration of from 30 to 50% by weight and which is substantially free from any other polyvalent metal oxides than silica and in which the colloidal silica has a mean part...	03/31/1992
5066420	Production of silica colloids Silica colloids having a spherical form, a mean diameter of between about 10 and 100 nm and a polydispersity index between about 1 and 4. A process for making silica colloids is also provided comprising a) forming a reaction medium by simultaneously addin...	11/19/1991
4343717	Process for the preparation of stable silica sol Stable, colloidal, silica sol is provided by a process which comprises vigorously mixing a slurry of calcium silicate with a dilute acid having a pKa value of less than about 8, such as sulfuric acid, and thereafter separating the sol from the ...	08/10/1982
4248600	High solids aqueous silica dispersion A method for increasing the bulk density of silica. Acid is added to an aqueous silica wet cake slurry to bring the pH to about 1.8 to 4.0, and dry fine particle silica is added with an agitator rpm of at least 2000 rpm. The acid and silica are alternatel...	02/03/1981
3969266	Microporous membrane process for making concentrated silica sols Aqueous silica sols having a pH from 8 to 11 containing 1 to 40% by weight of colloidal silica and soluble salts can be purified and concentrated by filtering the soluble salt from the sol using a microporous membrane filter while maintaining the salt con...	07/13/1976
3962111	Process for the production of silico-formic acid granules containing an alkali catalyst A dry alkaline earth metal metasilicate or an alkali metal metasilicate is chemically reacted with a concentrated mineral acid or an alkali metal hydrogen salt to produce silico-formic acid and a salt. The silico-formic acid is washed with water to remove...	06/08/1976
3962067	Process for the production of an aqueous solution of silicoformic acid Silicoformic acid granules will go into solution when mixed in a dilute aqueous solution of an alkali metal hydroxide or an alkali metal salt of a weak acid....	06/08/1976
3960747	Process for the production of an acidic aqueous solution of silico-formic acid An acidic solution of silico-formic acid is obtained by adding a solution of silico-formic acid in a dilute alkali metal hydroxide solution or an alkali metal silico-formate solution slowly into an acid solution. The pH must remain below 5....	06/01/1976

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Class 516/82 - The silica is formed or grown by reaction of alkali silicate and non-siliceous inorganic acid (e.g., H2SO4)