Abstract:
PROBLEM TO BE SOLVED: To provide a silicon dioxide powder displaying a good thickening action combined with a short incorporation time into polymers, particularly polyester resins. SOLUTION: The silicon dioxide powder is pyrogenically produced in the form of aggregates of primary particles having a BET surface area of 200±25 m 2 /g, wherein the aggregates display an average surface area of 7,000 to 12,000 nm 2 , an average equivalent circle diameter (ECD) of 80 to 100 nm and an average circumference of 850 to 1,050 nm. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
Process for preparing pulverulent solids, in which one or more oxidizable and/or hydrolysable metal compounds are reacted in a high-temperature zone in the presence of oxygen and/or steam, the reaction mixture is cooled after the reaction, and the pulverulent solid is removed from gaseous substances, wherein at least one metal compound is introduced into the high-temperature zone in solid form and the evaporation temperature of the metal compound is below the temperature of the high-temperature zone.
Abstract:
Aluminium oxide powder produced by flame hydrolysis and consisting of aggregates of primary particles, having a BET surface area of from 100 to 250 m /g, a dibutyl phthalate absorption of from 50 to 450 g/100 g of aluminium oxide powder, which powder shows only crystalline primary particles in high-resolution TEM pictures. It is prepared by vaporising aluminium chloride, transferring the vapour by means of a carrier gas to a mixing chamber and, separately therefrom, supplying hydrogen, air (primary air), which may optionally be enriched with oxygen and/or may optionally be pre-heated, to the mixing chamber, then igniting the mixture of aluminium chloride vapour, hydrogen, air in a burner and burning the flame into a reaction chamber that is separated from the surrounding air, subsequently separating the solid material from the gaseous substances and then treating the solid material with steam and optionally with air, the discharge rate of the reaction mixture from the mixing chamber into the reaction chamber being at least 10 m/s, and the lambda value being from 1 to 10 and the gamma value being from 1 to 15. It can be used as an ink-absorbing substance in ink-jet media.
Abstract:
Polvo de dióxido de silicio producido pirogénicamente, en forma de agregados de partículas primarias, caracterizado porque, - tiene una superficie BET de 200 ± 25 m2/g y los agregados exhiben - una superficie media de 7.000 a 12.000 nm2, - un diámetro de círculo equivalente (ECD = Diámetro Equivalente de Círculo) medio de 80 a 100 nm y - un perímetro medio de 850 a 1050 nm.
Abstract:
Titanium-aluminium mixed oxide powder with a proportion of aluminium oxide of less than 1 wt. % or a proportion of titanium dioxide of less than 5 wt. %, wherein the sum of the proportions of titanium dioxide and aluminium oxide is at least 99.7 wt. %. It is produced by transferring a vaporous starting compound of the quantitatively greater component of the mixed oxide into a mixing chamber by means of primary air and a vaporous starting compound of the quantitatively smaller component of the mixed oxide by means of an inert gas, and burning the mixture mixed with hydrogen in a mixing chamber into a reaction chamber. It can be used as a catalyst support.
Abstract:
Polvo de óxido de aluminio en la forma de conglomerados de partículas primarias, caracterizado porque tiene un área de superficie específica según BET de desde 10 hasta 90 m 2 /g y comprende como fases cristalinas, además del gamma-óxido de aluminio y/o del theta-óxido de aluminio, por lo menos 30 % de delta-óxido de aluminio.
Abstract:
Oxide comprises a pyrogenically produced oxide as the base component which is doped with 0.000001-40 wt.% erbium oxide. The doped oxide has a BET surface area of 1-1000 m2/g. Independent claims are also included for the following: (1) Process for the production of the oxide; (2) Green body or glass produced using a powder of the above oxide; and (3) Layers made from the above oxide.
Abstract:
Aluminium oxide powder produced by flame hydrolysis and consisting of aggregates of primary particles, having a BET surface area of from 100 to 250 m2/g, a dibutyl phthalate absorption of from 50 to 450 g/100 g of aluminium oxide powder, which powder shows only crystalline primary particles in high-resolution TEM pictures. It is prepared by vaporizing aluminium chloride, transferring the vapour by means of a carrier gas to a mixing chamber and, separately therefrom, supplying hydrogen, air (primary air), which may optionally be enriched with oxygen and/or may optionally be pre-heated, to the mixing chamber, then igniting the mixture of aluminium chloride vapour, hydrogen, air in a burner and burning the flame into a reaction chamber that is separated from the surrounding air, subsequently separating the solid material from the gaseous substances and then treating the solid material with steam and optionally with air, the discharge rate of the reaction mixture from the mixing chamber into the reaction chamber being at least 10 m/s, and the lambda value being from 1 to 10 and the gamma value being from 1 to 15. It can be used as an ink-absorbing substance in ink-jet media.