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| Number | Title | Issue Date |
| 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 |
| 6365638 | Process for preparation of hydrophilic or partially hydrophilic inorganic aerogels Process for preparation of hydrophilic or partially hydrophilic inorganic aerogels. The invention relates to a process for the preparation of hydrophilic or partially hydrophilic inorganic aerogels, which comprises pyrolyzing a hydrophobic inorganic aerog... | 04/02/2002 |
| 6360564 | Sol-gel method of preparing powder for use in forming glass A sol-gel method of preparing a powder for use in forming a glass is provided, along with methods of preparing glasses and glass fibers from the powder. The inventive method allows for the incorporation of a wide range of elements and compositions into a ... | 03/26/2002 |
| 6342193 | Amorphous silica particles having a double structure, process for producing the same and use The present invention provides the amorphous silica particles having a double structure of a core of the dense amorphous silica and a shell of the bulky amorphous silica, having a volume-based median diameter of from 1 to 5 μm and containing not more tha... | 01/29/2002 |
| 6339034 | Light-weight ceramic insulation Ultra-high temperature, light-weight, ceramic insulation such as ceramic tile is obtained by pyrolyzing a siloxane gel derived from the reaction of at least one organo dialkoxy silane and at least one tetralkoxy silane in an acid or base liquid medium. Th... | 01/15/2002 |
| 6334988 | Mesoporous silicates and method of making same A method of preparing mesoporous silica from a reaction mixture comprising a mineral acid such as HCl, an inorganic oxide source such as tetraethoxysilane, a surfactant such as cetyltrimethlyammonium bromide and water. The reaction mixture is mixed, e.g.,... | 01/01/2002 |
| 6315971 | Process for producing low density gel compositions Disclosed are processes for producing gel composition which may be utilized to produce low density gel compositions without the need for supercritical drying, thermal treatment or surface treatment. The processes comprise drying a wet gel comprising gel s... | 11/13/2001 |
| 6274112 | Continuous production of silica-based microgels A continuous process is provided for preparing silica microgels using carbon dioxide as a gel initiator at a pressure of at least about 172 kPa (about 25 psig). Consistent performance of microgel can be produced with varying production rates.... | 08/14/2001 |
| 6267942 | Method for producing spherical silica particles It is an object of the present invention to obtain solid spherical silica particles having no depression or crack on the surface. The present invention provides a process for producing spherical silica particles, which comprises dispersing silica gel part... | 07/31/2001 |
| 6239243 | Method for preparing hydrophilic silica gels with high pore volume A method for the preparation of hydrophilic silica gels with high pore volume. In the preferred method a hydrophilic silica hydrogel treated with an organosilicon compound to effect hydrophobing of the silica hydrogel is heated in the presence of an oxidi... | 05/29/2001 |
| 6228340 | Method for the production of macroporous ceramics Macroporous ceramics were produced using the droplets of an emulsion as the templates around which the ceramic is deposited through a sol-gel process. Subsequent aging, drying and calcination yields a ceramic with pores in the range of 0.1 to several micr... | 05/08/2001 |
| 6225245 | Silica gel, synthetic quartz glass powder and shaped product of quartz glass A synthetic quartz powder obtained by calcining a powder of silica gel, characterized in that white devitrification spots having sizes of larger than 20 μm in diameter formed in an ingot obtained by vacuum melting the synthetic quartz powder at a tempera... | 05/01/2001 |
| 6197270 | Process for producing aerogel There is provided a process for producing an aerogel which comprises lowering a pH of a water glass solution to obtain a sol, gelling the sol to obtain a hydrogel, replacing water in the gel with an organic solvent, reacting the gel with a hydrophobilizin... | 03/06/2001 |
| 6191173 | Process for the production of organofunctionalized aerogels The invention relates to a process for preparing organofunctionally modified aerogels by gelling a water glass by means of polycondensation and then converting it, by drying while retaining the structure of the gel, to give an aerogel, which process compr... | 02/20/2001 |
| 6180076 | Readily dispersible precipitated silica Precipitated silica, having the following physico-chemical parameters: BET surface area 120-300 m2 /g CTAB surface area 100-300 m2 /g BET/CTAB ratio 0.8-1.3 Sear... | 01/30/2001 |
| 6174926 | Method of preparing organically modified silica The present invention provides a method of preparing lipophilic silica in an aqueous medium in the absence of added acids, bases, or organic solvents. In particular, the present inventive method of preparing lipophilic silica comprises (a) providing a mix... | 01/16/2001 |
| 6168773 | Rapid process for making silica gel and silicate polymer and low density gels made thereby This invention relates to a rapid process for the preparation of a silica gel or a silicate polymer comprising contacting at least one fluoroalkoxysilane with a solution comprising water, optionally in the presence of a solvent and/or a catalyst. Low dens... | 01/02/2001 |
| 6159539 | Process for preparing organically modified aerogels and use thereof The inventive process concerns the preparation of organically modified aerogels and their use. The process the invention comprises: a) introducing a siliceous lyogel or hydrogel, b) optionally subjecting the gel prepared in a) to complete or partial solvent ex... | 12/12/2000 |
| 6156223 | Xerogels and their preparation Thermally insulative xerogels and their preparation are described. To obtain these xerogels, an inorganic gel having hydroxyl moieties is reacted with a silicon-nitrogen compound which has a C1-6 hydrocarbon moiety on the silicon. Shrinkage of ... | 12/05/2000 |
| 6140377 | Process for preparing organically modified aerogels using alcohols The invention relates to a process for the preparation of aerogels having hydrophobic surface groups, consisting of a) taking a silicate-type lyogel, b) optionally subjecting the lyogel taken in Step a) to a solvent exchange with another solvent, c) surface-mo... | 10/31/2000 |
| 6129899 | Processes for producing synthetic quartz powder and producing shaped quartz glass A process for producing a synthetic quartz powder, which comprises a step of heat-treating a silica gel powder while permitting it to flow in a rotary kiln.... | 10/10/2000 |
| 6129949 | Process for preparing organically modified aerogels using alcohols, wherein the resultant salts are precipitated The invention concerns a process for preparing organically modified aerogels, in which a) a silicic acid sol with a pH ࣘ4.0 is produced from an aqueous potassium silicate solution using at least one organic and/or inorganic acid; b) the resultant silici... | 10/10/2000 |
| 6127306 | Organofunctionalized aerogels The invention relates to aerogels containing functional residues of the formula (I)--Y--Z, wherein Y is a straight-chained or branched alkylene group with 1 to 22 carbon atoms; Z is halogen, pseudohalogen, SR1, PR2 R3, col... | 10/03/2000 |
| 6110439 | Dry silica gel and process of preparation A wet silica gel can be prepared by a process comprising the steps of contacting a stable, aqueous, fluid, silica system having a pH greater than 7.5 with an ion exchange resin which removes metal ions and replaces them with H+ ions and thereby reduces th... | 08/29/2000 |
| 6110852 | Process for producing synthetic quartz glass powder A process for producing synthetic quartz powder which comprises calcining silica gel powder to produce a synthetic quartz glass powder, wherein dry air is used in the calcining process at least in the process of cooling from 800° C. to 200° C. This proc... | 08/29/2000 |
| 6103209 | Process for preparing porous spherical silica xerogels Process for preparing porous spherical silica particles substantially consisting in emulsifying an acidic silica sol in a dispersing media, gelifying the microdrops of the sol in the emulsified state and submitting the resulting gel to thermal treatment i... | 08/15/2000 |
| 6071997 | Three-dimensionally connected silica spheres-resin composite and method for production thereof A three-dimensional composite of silica spheres interconnected by resin is provided having a three-dimensional network structure including silica particles having the following structural and dynamic characteristics and a resin present in the internal por... | 06/06/2000 |
| 6071487 | Method of manufacturing a silica powder In the method, a suspension of silica particles in water is provided, the suspension is gelled, the resulting gel is dried under microwaves, the dried gel is fractioned into silica granules having a diameter lying in the range 10 μm to 1000 μm, having a... | 06/06/2000 |
| 6060523 | Continuous process for preparing microgels Silica deposits formed during a continuous process for preparing polysilicate microgel are removed and purged form the process by elastically deforming the vessel walls, reducing plugging.... | 05/09/2000 |
| 6047568 | Method of manufacturing a silica powder and use of such a powder in making an optical fiber preform A method of manufacturing a silica powder using a sol-gel technique, wherein a suspension consisting of synthetic silica soot, having a specific surface area of less than 80 m2 /g, is made in water to form a concentration of 50% to 75% by weigh... | 04/11/2000 |
| 6017505 | Method of producing inorganic aerogels under subcritical conditions Preparation of inorganic aerogels based on oxides of the metals magnesium, aluminum, silicon, tin, lanthanum, titanium, zirconium, chromium and/or thorium by producing a hydrogel in a sol/gel process, replacing the water in the hydrogel by an organic solv... | 01/25/2000 |
| 6007685 | Deposition of highly doped silicon dioxide films The specification describes sputtering processes for the deposition of silicon dioxide films doped with high levels of oxides or other materials to alter the optical and/or electrical characteristics of the films. Sol gel methods are used to prepare compo... | 12/28/1999 |
| 6004436 | Processes for the chemical modification of inorganic aerogels A process is described to modify the chemical structure of an aerogel under conditions which inhibit plasma formation within the aerogel pores, which process includes; (a) providing an aerogel with a pore size of less than 0.1μ; (b) exposing the initial ... | 12/21/1999 |
| 5989524 | Silica compatible with flavors, process for its preparation and dentifrice compositions containing it Silica compatible with flavors, exhibiting, at an RP/DA abrasivity lower than or equal to 10, a compatibility with flavors which is higher than 10% and, at an RP/DA abrasivity higher than 10, a compatibility with flavors of at least 30%. Process for the p... | 11/23/1999 |
| 5958577 | Transparent bulk silica porous material with uniform pore size and distribution The method for producing a bulk silica porous material is presented. The obtained material has a large crystal size serving to reduce light scattering, and uniform and adjustable pore size. This can be utilized for optical and electronic functional materi... | 09/28/1999 |
| 5958127 | Process for the preparation of precipitated silica, new precipitated silicas containing zinc and their use for the reinforcement of elastomers The invention relates to a new process for the preparation of precipitated silica which has a good dispersibility and very satisfactory reinforcing properties. It also relates to new precipitated silicas which are in the form of powder, of substantially s... | 09/28/1999 |
| 5942590 | Process for making hydrophobic silica with reduced surface area under neutral conditions The present invention is hydrophobic silica gels having a reduced surface area and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of a mixture comprising a silica hydrosol and colloi... | 08/24/1999 |
| 5919726 | Method for producing photocatalyst material A primary object of the present invention is to easily and securely fix a photocatalyst to a substrate. According to the invention, there is provided a process for preparing a photocatalyst material, the process comprising a first step of forming an under... | 07/06/1999 |
| 5900450 | Three-dimensionally connected silica sphere-resin composite and method for production thereof A method for preparing a three dimensionally connected silica spheres-resin composite, which comprises hydrolyzing and polymerizing a low molecular weight polyalkoxysilane in the presence of an acid catalyst in a mixed solution of the low molecular weight... | 05/04/1999 |
| 5888425 | Process for the preparation of modified aerogels, and their use The invention relates to a process for the production of modified SiO2 aerogels in which a) a silicatic lyogel is prepared, b) if desired, the lyogel prepared in step a) is subjected to a solvent exchange with another organic solvent, c) the gel obt... | 03/30/1999 |
