161 results about "Alumina hydrate" patented technology

Production of an alumina powder characterized by having a single or multiple crystal structure selected from the group consisting of gamma, delta and theta-forms, a primary particle size of 10 to 50 nm, a mean secondary particle size of 100 to 500 nm, and a granular primary particle shape, or an alumina powder characterized by having an a-form crystal structure, a primary particle size of 60 to 150 nm, a mean secondary particle size of 200 to 500 nm, and a granular primary particle shape, using as a raw material an alumina hydrate comprising rectangular plate-like primary particles having a boehmite structure and having a length of one side of 10 to 50 nm; and preparation of a polishing composition comprising the alumina powder, water and a polishing accelerator.

An inkjet recording medium including a water-resistant support, and on the water-resistant support, two or more ink receiving layers including an upper ink receiving layer and a lower ink receiving layer, each of the two or more ink receiving layers containing a pseudo boehmite alumina hydrate, wherein the upper ink receiving layer further contains a polyvinyl alcohol having a saponification degree of 90% or higher and at least one crosslinking agent selected from the group consisting of boric acid and boric acid salts, and the lower ink receiving layer further contains a polyvinyl alcohol having a saponification degree of less than 90% and at least one cross-linking agent selected from the group consisting of boric acid and boric acid salts.

The invention relates to a complex combination alumina-carborundum-(carbon) series amorphous fire proof material, and the formula comprises: 36 to 32 percent of 8-3mm corundum or bauxite, 18 to 26 percent of 3-1mm corundum or bauxite, 10 to 22 percent of 1-0.0088mm corundum or bauxite, 0 to 15 percent of 1-0.088mm carborundum, 0 to 3 percent of 1-0.0088 spherical asphalt, 0 to 20 percent of d90 less than 0.088mm corundum or bauxite, 0 to 20 percent of d90 less than 0.088 carborundum, 0 to 3 percent of d90 less than 0.088mm high-carbon materials, 0 to 5 percent of alpha alumina micro powder, 1 to 8 percent of alumina hydrate, 1 to 6 percent of silicon ash, 0 to 2 percent of calcium aluminate cement, 0.05 to 0.4 percent of plus super-plasticizer (polycarboxylic acids+sulfonated naphthalene formaldehyde polymer+sulfonated melamine polymer), 1 to 6 percent of plus polypropylene acid series latex and 1 to 6 percent of plus water. Compared with low-cement aluminum carborundum carbon material, the material has good anti-corrosion performance. Therefore, the service life of a kilneye of a cement kiln and a main groove slag line of a blast furnace can be prolonged when a product is combined by the complex combination alumina-carborundum-(carbon) series amorphous fire proof material instead of the cement.

The present invention discloses an ink-jet recording material having a support and at least two ink-receptive layers containing inorganic fine particles and a hydrophilic binder, which comprises an ink-receptive layer A nearer to the support containing precipitated silica fine particles having an average secondary particle diameter 500 nm or less, or precipitated silica fine particles having an average secondary particle diameter 500 nm or less and fumed silica fine particles having an average secondary particle diameter 500 nm or less, and containing less than 20 parts by weight of a polyvinyl alcohol based on 100 parts by weight of the whole silica fine particles in the ink-receptive layer A, and an ink-receptive layer B farther from the support containing at least one kind of fine particles selected from fumed silica, alumina and alumina hydrate and less than 25 parts by weight of a polyvinyl alcohol based on 100 parts by weight of the fine particles.

The invention provides methods and compositions for improving the production of alumina hydrate. The invention involves adding one or more polysaccharides to liquor or slurry in the fluid circuit of the production process. The one or more polysaccharides can be a cross-linked polysaccharide (such as cross-linked dextran or cross-linked dihydroxypropyl cellulose). The various polysaccharides can impart a number of advantages including at least some of: greater flocculation effectiveness, increasing the maximum effective dosage, faster settling rate. The production process can be a Bayer process.

This invention discloses a pseudoboehmite and its preparation method. This pseudoboehmite is prepared by following steps: a) at acidity condition that can make aluminum precipitate, precipitate aluminum of aluminum compound water solution, separate, and get a kind of amorphous alumina hydrate; b) mix amorphous hydrated aluminum oxide with water and at least one kind of water-soluble alkali, slurry, stabilize at 20deg-90deg for 0.2-6 hours, wherein dosage of above alkali make serumal pH be 6-11. Compared with existing technique, pseudoboehmite prepared by this invention can get aluminum oxide of bore distributing localized by calcining.

The invention provides an ink jet recording medium which attains the prevention of the bronzing of cyan ink and the prevention of the migration of magenta ink at the same time and is excellent in image characteristics. The ink jet recording medium comprises a substrate and an ink-receiving layer provided with at least an upper layer as the outermost layer and a lower layer as a layer lying just under the upper layer, both layers having a porous structure formed of an alumina hydrate and a binder, wherein both of the upper and lower layers contain an alkylsulfonic acid and only the lower layer contains a cationic polymer.

The present invention provides a hydrated alumina containing pseudo-boehmite, wherein the hydrated alumina further contains basic aluminum ammonium carbonate. The present invention also provides a method for preparing hydrated alumina, the method comprising contacting sodium metaaluminate and/or sodium aluminate with an acidic solution, and aging the mixed slurry obtained after the contact reaction in the presence of an aging agent The conditions of the contact reaction include: the reaction pH value is 4.5-9, and the reaction temperature is 15-75°C; the aging conditions include: the temperature is 20-60°C, and the time is 2-6 hours; the aging agent Ammonium carbonate and/or ammonium bicarbonate. The alumina carrier prepared by using the hydrated alumina prepared by the method for preparing hydrated alumina according to the present invention has significantly improved most probable pore diameter, average pore diameter, pore volume and pore volume with a diameter of 10-60 nanometers.

A catalyst for selectively oxidizing carbon monoxide in a hydrogen-containing gas comprises an alumina hydrate carrier and at least platinum supported thereon. With an aluminum hydrate as a carrier, the catalyst is resistant to deactivation which would be caused by an oxygen-containing hydrocarbon in a hydrogen-rich gas. The method for selectively removing carbon monoxide comprises the steps of adding oxygen to a hydrogen-rich gas containing carbon monoxide, in an amount necessary to oxidize at least part of carbon monoxide, and bringing the resulting mixture into contact with the catalyst for selectively oxidizing carbon monoxide. The solid polymer electrolyte-type fuel cell system utilizes the above method for selectively removing carbon monoxide.

This invention is alumina diolame phosphor powder; it is coated of Al2O3 on phosphor powder surface. Its coating method is that buffer solution is made-up by conjugate acid-base system eith Ph value is between 4.5~6.0, and its concentration is between 0.1M and 2M. Concentration is 0.01~1.0M water soluble aluminium salt solution is made-up by Al2O3 and phosphor powder and equal quality water soluble aluminium salt, the weight ratio of Al2O3 and phosphor powder is (0.25~20):100. Phosphor powder is added into buffer solution to make-up water soluble aluminium salt of 0.0.1~1.0M concentration. It is agitated and ultra sonic dispersed to make phosphor powder disperse in buffer solution. The phosphor powder suspension is heated to 20~600C, and agitated at speed of 100r/m~300r/m, then water soluble aluminium salt is added into suspension, dropwise velocity is 5~500ml/min. The temperature is holding and agitated for 30~120min. Finally, mother liquor is adjusted by alkali solution to pH value is 6~7, then alumina hydrate is got. alumina diolame phosphor powder is got after separation, water washing, dehydration, and is dried at 60~1200C to make water content of phosphor powder is low of 0.25%, and ignited 1~3hours at 200~4000C and air cooling in stove.

A method for forming a receiver transport member for an electrostatographic reproduction apparatus. The transport member transports receiver members with respect to a fuser assembly and is frictional coupled to a transfer member for driving the transfer member. The method for forming the transport member provides a substrate bearing a high friction layer that includes inorganic particles, with a compound of aluminum selected from the group consisting of aluminum hydroxide, alumina hydrate, aluminum oxide, pseudo-boehmite, boehmite alumina, aluminum salts, and mixtures thereof, dispersed in an organic binder so that the high friction layer is capable of preventing a loss of frictional coupling due to release oil applied to a receiver member bearing a fused toner image.

The invention relates to a large and special shape porzite-corundum series sintering fire proof material product and a manufacturing technique thereof, and the product formulation comprises: 48 to 56 percent of porzite 5 to 1mm, 12 to 22 percent of the porzite or three stone 1 to 0.088mm, 16 to 25 percent of the porzite and three stone fine powder d90 less than 0.088mm, 0 to 18 percent of alumina fine powder d90 less than 0.088mm, 0 to 5 percent of alumina micro powder d95 less than 0.020mm, 0 to 5 percent of zirconium quality micro powder d95 less than 0.015mm, 2 to 5 percent of silicon ash, 2 to 6 percent of alumina hydrate less than 0.088mm, 0 to 5 percent of magnesium additive, 0.05 to 0.4 percent of plus super-plasticizer (polycarboxylic acids+sulfonated naphthalene formaldehyde polymer+sulfonated melamine polymer), 1 to 6 percent of plus polypropylene acid series latex and 1 to 6 percent of plus water. The materials can be used as fire proof material of the large and special shape porzite-corundum series sintering fire proof material product, and the like, and is used for high-temperature industry of ceramics, glass, and the like.

The present invention provides microporous photo quality glossy inkjet receiving media comprising a substrate, an absorbent basecoat layer, and an ink-receptive topcoat. The absorbent basecoat layer is primarily a combination of pigment and binder, and may include deformable particles, such as core-shell polymeric pigments. The ink-receptive topcoat is composed primarily of alumina hydrate, gelatin, and a water-insoluble cationic polymer. The present invention also provides a method for increasing the gloss and surface smoothness presented by the topcoat of a printing medium by including deformable particles in an underlying basecoat followed by calendering of the printing medium. Further, the present invention provides combination matte and gloss inkjet printing media, comprising matte basecoats at least partially coated with the aforementioned ink-receptive topcoat.

An antireflection film including a transparent thin film layer, and a transparent fine uneven layer whose main component is an alumina hydrate, which layers are formed in this order on a surface of a transparent substrate, is provided. The transparent thin film layer has an intermediate refractive index between the refractive index of the transparent substrate and the refractive index of the fine uneven layer, and the transparent thin film layer includes at least a nitride layer or an oxynitride layer.

According to the present invention, in an ink-jet recording material in which at least two ink-receptive layers containing inorganic fine particles and a hydrophilic binder are provided on a support, an ink-jet recording material wherein an ink-receptive layer (A) nearer to the support contains fumed silica, and an ink-receptive layer (B) apart from the support contains alumina or alumina hydrate is provided.

Disclosed herein is a printing medium provided on a base material with a porous ink-receiving layer which comprises, as principal components, an alumina hydrate having a boehmite structure and a binder, wherein when measuring with an ink containing 0.1% by weight of a surfactant, the time required to absorb 30 ng of an ink is 400 milliseconds or shorter, the dye-adsorbing capacity falls within a range of from 900 to 2,000 mg/m2, and the index of dye-adsorbing rate falls within a range of from 0.0 to 5.0.

The present disclosure suggests a method of manufacturing flake aluminum oxide using a microwave including: performing a pre-treatment on a starting material by grinding the starting material such as alumina hydrate, aluminum salt or the like and classifying particles with an appropriate size; manufacturing transition alumina by performing a heat treatment by means of heating the pre-treated starting material; mixing the transition alumina with molten salt and an additive and then dispersing and grinding the mixed compounds; melting and synthesizing flake aluminum oxide by heating the dispersed and grinded mixture with a microwave as a heating source; separating the molten salt and the additive from the synthesized aluminum oxide; and performing a post-treatment on the flake aluminum oxide by removing a foreign substance such as an additive residue stuck to a surface of a crystal particle of the separated flake aluminum oxide.

In an ink jet recording medium having at least two ink receiving layers, the total content of boric acid, a borate, and a water-soluble zirconium salt of a lower ink receiving layer located close to a support substrate to the total content of alumina and an alumina hydrate thereof is higher than the total content of boric acid, a borate, and a water-soluble zirconium salt of an upper ink receiving layer located apart from the support substrate to the total content of alumina and an alumina hydrate thereof.