Abstract:
PROBLEM TO BE SOLVED: To provide an aqueous dispersion containing silica that is produced by a thermal decomposition method and advantageous when used in a chemical mechanical polishing(CMP) process. SOLUTION: This purpose is achieved by the aqueous dispersion containing silica that is produced by the thermal decomposition method using aerosol by which the silica is doped with alkali. Regarding the silica in the dispersion, an average particle diameter of its second particles is =0.7.
Abstract:
PROBLEM TO BE SOLVED: To provide a dispersion in which an oxide surface can be removed with a high rate during the chemical-mechanical polishing without leaving scratches on the surface to be polished. SOLUTION: The aqueous dispersion contains a silicon dioxide powder prepared by a thermal decomposition process doped with an aluminum oxide in the form of aerosol. The powder has the aluminum oxide content in an amount of 0.01-3 mass%, advantageously 0.2-1.5 mass% relative to the total amount of the powder. The dispersion has an average particle diameter of maximum 0.1 μm. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide an easily obtainable aqueous dispersion containing cerium oxide, having a very low impurity content and capable of giving a particle diameter in a reproducible manner. SOLUTION: The aqueous dispersion contains pyrolytic silicon dioxide doped with cerium oxide and this cerium oxide is introduced by aerosol comprising a cerium salt solution or a cerium suspension and has
Abstract:
Dispersion comprising hydrophobic pyrogenically prepared silicon dioxide, alcohol and at least one additive which promotes the dispersion and, as additional component, at least one insecticide and/or acaricide. The dispersion can be canned in spray cans and used as insecticide.
Abstract:
Dispersion comprising, in addition to water, 0.5 to 20 wt.% of hydrophobic silica, 0.01 to 10 wt.% of a gelling or viscosity-increasing additive, 0.1 to 1 wt.% of a preservative and 0 to 1 wt.% of a surface-active substance. It is prepared by a procedure in which the individual components are dispersed successively or together into the water and in this procedure the individual components are deaerated before and/or during the addition or the dispersion is deaerated during the individual dispersing steps. The dispersion can be employed as an insecticide.
Abstract:
Process for preparing a dispersion of surface-modified silicon dioxide particles having an average particle diameter of not more than 100 nm by high-pressure milling of a preliminary dispersion comprising a) 10% to 50% by weight of surface-modified silicon dioxide particles, b) at least one glycol monoether of the general formula (A): H3C(CH2)m-O-(CH2)n-[O-(CH2)o]p-OH, c) at least one carboxylic ester of the general formula (B): H2x+1Cx-O-CH2-(CHR)-[O-CHR]y-O-C(=O)-CzH2z+1, d) the molar ratio A/B being 10:90 to 40:60 and m, n, o, p, x, y and z being independent of one another. Dispersion obtainable by this process. Process for producing granules of surface-modified silicon dioxide particles by separating off the liquid phase of the dispersion. Granules obtainable by this process. Use of dispersion and granules in coating materials.
Abstract:
Process for preparing surface-modified silicon dioxide particles with a mean particle diameter of at most 100 nm, comprising the steps of: a) providing a predispersion b) high-pressure grinding of the predispersion to form a dispersion c) removing the liquid phase of the dispersion, the predispersion comprising al) surface-modified silicon dioxide particles which are at least partly aggregated, are bonded to the surface-modifying component via Si-O-Si bonds and still have reactive groups on their surface, a2) one or more organosilicon compounds which have at least one silicon-carbon bond and at least one functional group which can react with the reactive groups to form a covalent Si-O-Si bond, and a3) one or more solvents. Redispersible, surface-modified silicon dioxide particles obtainable by this process. Use of these in toner powders, silicone rubber, adhesives and scratch-resistance surface coatings.
Abstract:
Aqueous dispersion obtainable by placing in water an aggregated titanium dioxide powder having a specific surface area of from 20 to 150 m 2 /g in such an amount that the desired dispersion comprises at least 20 wt.% titanium dioxide, and at least one amino alcohol having from 1 to 6 carbon atoms, and at least one carboxylic acid from the group comprising dibasic carboxylic acids and/or hydroxycarboxylic acids having from 2 to 6 carbon atoms, - the amino alcohol being present in the dispersion in an amount of from 2.5 to 7.0 µmol./m 2 specific surface area TiO 2 and the carboxylic acid being present in an amount of from 1.0 to 3.5 µmol./m 2 specific surface area TiO 2 , - producing a pre-dispersion by introducing energy in an amount of less than 200 kJ/m 3 and then producing a dispersion in which the aggregated titanium dioxide powder has a mean, volume-related aggregate diameter of less than 150 nm by grinding the pre-dispersion by means of a high-energy mill at a pressure of at least 500 bar. The dispersion can be used in the coating of glass, ceramics and metal surfaces.
Abstract translation:通过将具有20至150m 2 / g的比表面积的聚集的二氧化钛粉末放置在水中而获得的水溶液,其量使得所需的分散体包含至少20重量%的二氧化钛 和至少一种具有1至6个碳原子的氨基醇,和至少一种含有二元羧酸和/或具有2至6个碳原子的羟基羧酸的羧酸, - 氨基醇存在于分散体 其量为2.5至7.0μmol/ m 2比表面积TiO 2,羧酸的存在量为1.0-3.5μmol/ m 2 比表面积TiO 2 2,通过引入少于200kJ / m 3的量的能量产生预分散,然后 产生其中聚集的二氧化钛粉末通过研磨预分散剂具有小于150nm的平均体积相关聚集体直径的分散体 通过在至少500巴的压力下的高能磨机。 分散体可用于玻璃,陶瓷和金属表面的涂层。
Abstract:
Process for preparing an alkaline dispersion of aggregated silicon dioxide particles by dividing a preliminary dispersion within a pH of 3 to 5 into at least two streams, placing these streams under a pressure of at least 50 bar and depressurizing them to a collision point, each via one nozzle, in a grinding chamber, and admixing the dispersion that runs off at the bottom, while still in the grinding chamber, with an alkaline substance in an amount such that the dispersion overall has a pH of more than 7.
Abstract:
Dispersion containing, in addition to water, 0.5 to 20% by weight of hydrophobic silica, 0.01 to 10% by weight of a gelling additive, or viscosity-increasing additive, 0.1 to 1% by weight of a preservative, 0 to 1% by weight of a surface -active substance, which, as further component, contains organic insecticides. It is produced by dispersing the individual components successively or together into the water and in this process deaerating the individual components before and/or during the addition or deaerating the dispersion during the individual dispersion steps. The dispersion can be used as insecticide.