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| Number | Title | Issue Date |
| 8048400 | Process for preparation of alumina powder and precursor thereof There is provided a process for the preparation of a alumina precursor powder from aluminum hydroxide powder obtained by hydrolysis of aluminum alkoxide which precursor enables to provide alumina powder with a high volumetric efficiency. Such process comprise... | 11/01/2011 |
| 7976820 | Composition and method for improved aluminum hydroxide production An improved method and composition for producing aluminum hydroxide crystals in a Bayer process pregnant liquor, involve the addition of an emulsified crystallization modifier comprising a C8-C10 fatty acid, precursors, salts or blends thereof.... | 07/12/2011 |
| 7976821 | Composition and method for improved aluminum hydroxide production An improved method and composition for producing aluminum hydroxide crystals from precipitation liquor, involves the addition of an emulsified crystal growth modifier comprising a C8-C10 fatty acid, precursors, salts or blends thereof. The emul... | 07/12/2011 |
| 7959895 | Process for the production of aluminum hydroxide Process for the production of aluminum hydroxide flame-retardants by wet-miling and spray-drying an aluminum hydroxide containing slurry. ... | 06/14/2011 |
| 7955589 | Composition and method for improved aluminum hydroxide production An improved method and composition for producing aluminum hydroxide crystals in a Bayer process pregnant liquor, involve the addition of a crystallization modifier comprising a C8-C10 fatty acid, precursors, salts or blends thereof. The alkyl c... | 06/07/2011 |
| 7811546 | Aluminum hydroxide aggregated particles, process for producing the same, vessel used therefor, and process for producing aluminum hydroxide powder Aluminum hydroxide aggregated particles which have an average particle diameter of not less than 40 μm, an average particle diameter as determined after pressing at 1,000 kg/cm2 of not more than 35 μm, and an L value of slurry obtained by mixing 20 ml o... | 10/12/2010 |
| 7438977 | Gibbsite type aluminum hydroxide particles having high oil absorption The present invention provides gibbsite type aluminum hydroxide particles having a primary particle diameter of from 0.01 μm to 0.3 μm and a DOP oil absorption of from 90 mL/100 g to 300 mL/100 g. ... | 10/21/2008 |
| 7425313 | Reinforcing aluminum-based filler and rubber composition comprising such a filler A reinforcing aluminum-based filler which can be used for reinforcing diene rubber compositions intended for the manufacture of tires, comprising an aluminum (oxide-)hydroxide corresponding, with the exception of any impurities and the water of hydration, to the gen... | 09/16/2008 |
| 7390343 | Drinking water filtration device The invention is a device for purifying drinking water that has at least one fibrous structure. Preferably, there is an upstream and downstream fibrous structure. Each fibrous structure is a mixture of nano alumina fibers and second fibers arranged in a matrix to cr... | 06/24/2008 |
| 7311752 | Electrostatic air filter The invention is a filter for gaseous media in which nano alumina fibers and second fibers are arranged in a matrix to create asymmetrical pores. The filter is a high efficiency, high capacity particulate filter that intercepts pathogens and other particulate matter... | 12/25/2007 |
| 7247292 | Aluminum hydroxide and production process thereof A method for producing aluminum hydroxide includes a step of elevating a temperature of a slurry of aluminum hydroxide suspended in a sodium aluminate solution from 70° C. or lower to 85° C. or higher, and a step of applying a centrifugal force to the slurry. The ... | 07/24/2007 |
| 7208446 | Quasi-crystalline boehmites containing additives The present invention pertains to a quasi-crystalline boehmite containing additive in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group of alkaline earth metals, alkaline metals, rare earth metals, transiti... | 04/24/2007 |
| 7144941 | Flame retardant polymer composition A flame retardant polymer composition consists of a) 20–60 percent by weight of a thermoplastic and/or cross-linked or cross-linkable elastomer and b) as a flame retardant agent 40–80 percent by weight either o... | 12/05/2006 |
| 7101529 | Aluminum hydroxide and production process thereof A method for producing aluminum hydroxide, comprises the steps of: elevating a temperature of a slurry having agglomerated secondary particles of aluminum hydroxide obtained through the Bayer's process suspended in a sodium aluminate solution from not more than 70°... | 09/05/2006 |
| 7067106 | Aluminum hydroxide, made via the bayer process, with low organic carbon A composition of matter which is aluminum hydroxide, produced using the Bayer Process, wherein the aluminum hydroxide produced has a Total Organic Carbon of less than about 0.5 milligrams Total Organic Carbon/gram aluminum hydroxide. ... | 06/27/2006 |
| 6919294 | Method for preparing hydrogenation purification catalyst A method for producing a hydrorefining catalyst is used to produce the hydrorefining catalyst which contains an inorganic oxide carrier and a hydrogenation-active metal and which has such a bimodal pore characteristic that pores having pore diameters of not more tha... | 07/19/2005 |
| 6887454 | Process for the production of aluminium hydroxide Gibbsite type aluminium hydroxides are obtained by seeding a Bayer liquor with bayerite crystals. The gibbsite type aluminium hydroxide show excellent properties as fire retardant fillers in synthetic resins. ... | 05/03/2005 |
| 6878357 | Method for particle size distribution control in a bayer circuit decomposition chain, comprising an agglomeration phase In a BAYER circuit, a process for controlling precipitation in which particle size quality of alumina hydrate produced in the circuit and circulating in feed tanks is monitored utilizing a calibration step and a control step. In the calibration step, cumulative perc... | 04/12/2005 |
| 6838005 | Nanosize electropositive fibrous adsorbent Aluminum hydroxide fibers approximately 2 nanometers in diameter and with surface areas ranging from 200 to 650 m2/g have been fount to be highly electropositive. When dispersed in water they are able to attach to and retain electronegative particles. Whe... | 01/04/2005 |
| 6828272 | Catalyst systems for polycondensation reactions The invention pertains to new catalyst systems for polycondensation reactions, for example for producing polyethylene terephthalate. In accordance with the invention, complex compounds with hydrotalcite-analogous structures of general formula [M(II)1−xM... | 12/07/2004 |
| 6827923 | Process for the production of aluminum hydroxide of improved whiteness Aluminium hydroxide of high whiteness is produced by (i) heating aluminium hydroxide obtained from the Bayer process to a temperature of 300 to 700° C. (ii) dissolving the soluble fraction of the thus obtained activated product at 85 to 275° C. in aqueous sodium h... | 12/07/2004 |
| 6764672 | Thermally stable alumina particulates Thermally stable transitional alumina particulates retaining high specific surface area after calcination at 1000° C. suitable for the use as catalysts or catalysts supports are produced by treating an aqueous solution containing Al3+ and optionally a do... | 07/20/2004 |
| 6649661 | Dispersions of alumina hydrate A dispersion of alumina hydrate comprises an alumina hydrate containing 0.1 to 1.0% by weight of a nitrate anion and having an average pore radius of 20 to 200 Å and a half breadth of pore radius distribution of 20 to 150 Å and deionized water. Another ... | 11/18/2003 |
| 6610261 | Reinforcing aluminum-based filler and rubber composition comprising such a filter A reinforcing aluminum-based filler which can be used for reinforcing diene rubber compositions intended for the manufacture of tires, comprising an aluminum (oxide-)hydroxide corresponding, with the exception of any impurities and the water of hydration,... | 08/26/2003 |
| 6599332 | Process for the production of aluminum hydroxide Aluminium hydroxide of improved thermal stability is produced by spray-drying of an aqueous slurry of aluminium hydroxide at 400 to 600° C. drying gas temperature. The resulting aluminium hydroxide is suitable as a flame retardant filler in polymeric sys... | 07/29/2003 |
| 6589908 | Method of making alumina having bimodal pore structure, and catalysts made therefrom A method for making alumina having a pore structure characterized by the absence of macropores, no more than 5% of the total pore volume in pores greater than 350 Å, a high pore volume (greater than 0.8 cc/g measured by mercury intrusion) and a bi-modal ... | 07/08/2003 |
| 6555496 | Micro-crystalline boehmites containing additives A microcrystalline boehmite containing additive in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group consisting of alkaline earth metals, alkaline metals, rare earth metals, transition metals, ac... | 04/29/2003 |
| 6514477 | Thermally stable aluminum hydroxide Printed circuit board laminates which have improved thermal stability. The improved properties are attributed to the use of a novel aluminium hydroxide which is described by the molecular representation: Al2 O3.multidot.nH.sub.2 O wh... | 02/04/2003 |
| 6508999 | Aluminum trihydroxide phase A phase of aluminum trihydroxide and supports and catalysts made therefrom. This invention also relates to methods of producing this phase of aluminum trihydroxide and catalysts made therefrom, and to a method for improving the activity of and for regener... | 01/21/2003 |
| 6503867 | Quasi-crystalline boehmites containing additives The present invention pertains to a quasi-crystalline boehmite containing additive in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group of alkaline earth metals, alkaline metals, transition metal... | 01/07/2003 |
| 6440187 | Alumina powder, process for producing the same and polishing composition Production of an alumina powder characterized by having a single or multiple crystal structure selected from the group consisting of γ, δ and θ-forms, a primary particle size of 10 to 50 nm, a mean secondary particle size of 100 to 500 nm, and a granul... | 08/27/2002 |
| 6440552 | Boehmite and base coat layer for magnetic recording medium The present invention provide a boehmite in which (i) a crystallite diameter in the direction perpendicular to the plane (020) is about 65 angstrom or longer and (ii) a ratio of a crystallite diameter in the direction perpendicular to the plane (002) to a... | 08/27/2002 |
| 6429172 | Method of manufacturing pseudo-boehmite Pseudo-boehmite, which is a raw material for a catalyst carrier for hydrogenation refining, is produced by mixing, under a predetermined condition, an aluminate aqueous solution produced from an alkaline etching step for aluminum in an alumite treatment a... | 08/06/2002 |
| 6423133 | Aqueous suspension based on alkaline aluminium polysulphate, preparation method and use in the field of building materials The present invention relates to an aqueous suspension comprising: A) silica and/or alumina particles, and B) a compound of overall formula (I): Al(OH)a (SO4)b (SiOx)c (Y)d (I) with: a between 0.1 and 2... | 07/23/2002 |
| 6413308 | Structured boehmite pigment and method for making same A structured boehmite pigment which comprises a plurality of alumina monohydrate particles. The pigment is particularly useful as a flatting pigment in paint and as an anti-block agent in plastic film. The boehmite pigment has an aggregate median particle... | 07/02/2002 |
| 6403007 | Method for manufacturing plate boehmite Method for manufacturing a plate boehmite and a plate alumina having high catalytic activity. The plate boehmite is prepared by subjecting at least one kind of an alkaline earth metal compound, which is selected from calcium, strontium and barium, and alu... | 06/11/2002 |
| 6391277 | Bayer process for production of alumina trihydrate An improvement in the Bayer process for producing alumina trihydrate in which bauxite ore is digested in a mixture with a digestion sodium aluminate liquor to produce a slurry, the slurry is settled to remove undigested residues therefrom and produce a pr... | 05/21/2002 |
| 6296819 | Process for the manufacture of coarse aluminium hydroxide A process for the manufacture of coarse aluminum hydroxide via the Bayer Process. The process involves the decomposition of a supersaturated alkaline aluminate liquor in a two stage precipitation process having an agglomeration stage and a growth stage. T... | 10/02/2001 |
| 6153157 | Value improvements of clays A process which allows the conversion of clay minerals of the kalonite group, to a relatively pure form of alumina and silica respectively comprising the steps of (a) heating the kaolinite group minerals to greater than 500° C., which causes dehydroxylat... | 11/28/2000 |
| 6130283 | Aluminum hydroxide, method for producing the same, and method of use of the same Aluminum hydroxide is disclosed, wherein a mean particle size of a secondary particle is from 0.1 to 8 μm, a BET specific surface area is not less than about 30 m2 /g and a pore size distribution has a maximum value within the range from 5 to ... | 10/10/2000 |
