Abstract: A process for milling amorphous solids using a milling apparatus can result in particles having a median particle diameter d50 of <1.5 ?m. The process includes: operating a mill in a milling phase with an operating medium selected from the group consisting of gas, vapor, steam, a gas containing steam and mixtures thereof, and heating a milling chamber in a heat-up phase before the actual operation with the operating medium in such a way that a temperature in the milling chamber, the mill exit or both, is higher than a dew point of the operating medium.

Abstract: The invention relates to a novel method for producing high-purity SiO2 from silicate solutions, a novel high-purity SiO2 with a specific impurity profile and use thereof.

Abstract: The invention relates to a novel method for producing high-purity SiO2 from silicate solutions, a novel high-purity SiO2 having a specific impurity spectrum and use thereof.

Abstract: Precipitated silicas with a high pH and their use in applications as defoamers having optimum silanol group density and a process for preparing precipitated silicas and to their use, particularly in defoamer formulations.

Abstract: A precipitated silica having a d50-value of from 150 to 2000 nm, a d90-value of from 500 to 7000 nm, a silanol group density of from 2.5 to 8 OH/nm2, and a modified tapped density of less than or equal to 70 g/l is useful for thickening and providing thixotropy in liquid systems and shows superior efficiency at thickening and creating thixotropy compared to existing grades of precipitated silica. The precipitated silica functions best as a thixotrope in non-polar or intermediate polar liquid systems such as unsaturated polyester (UPE) resin systems.

Abstract: Hydrophobic precipitated silicas with a high pH and low silanol group density, a process for preparing them and their use, particularly in deformer formulations.

Abstract: A process for milling amorphous solids using a milling apparatus can result in particles having a median particle diameter d50 of <1.5 ?m. The process includes: operating a mill in a milling phase with an operating medium selected from the group consisting of gas, vapor, steam, a gas containing steam and mixtures thereof, and heating a milling chamber in a heat-up phase before the actual operation with the operating medium in such a way that a temperature in the milling chamber, the mill exit or both, is higher than a dew point of the operating medium.

Abstract: A process for milling amorphous solids using a milling apparatus can result in particles having a median particle diameter d50 of <1.5 ?m. The process includes: operating a mill in a milling phase with an operating medium selected from the group consisting of gas, vapour, steam, a gas containing steam and mixtures thereof, and heating a milling chamber in a heat-up phase before the actual operation with the operating medium in such a way that a temperature in the milling chamber, the mill exit or both, is higher than a dew point of the operating medium.

Abstract: Precipitated silicas having an SiOHisolated absorbance ratio of greater than or equal to 1, may be used as reinforcers and thickeners for sealants.

Abstract: A precipitated silica having a d50-value of from 150 to 2000 nm, a d90-value of from 500 to 7000 nm, a silanol group density of from 2.5 to 8 OH/nm2, and a modified tapped density of less than or equal to 70 g/l is useful for thickening and providing thixotropy in liquid systems and shows superior efficiency at thickening and creating thixotropy compared to existing grades of precipitated silica. The precipitated silica functions best as a thixotrope in non-polar or intermediate polar liquid systems such as unsaturated polyester (UPE) resin systems.

Abstract: A precipitated silica having an SiOHisolated absorbance ratio of greater than or equal to 1.5, a silanol group density of 1 to 3.0 SiOH/nm2, a modified tapped density of 1 to 50 g/l, and a pH of 3-5, when measured as a aqueous suspension of 5.00 g of the precipitated silica in 100 ml. of deionized water allows preparation of storage-stable RTV-1 silicone rubber formulations without stabilizer. A process for preparing the precipitated silica and its use in thickening sealants is provided.

Abstract: A process for milling amorphous solids using a milling apparatus can result in particles having a median particle diameter d50 of <1.5 ?m. The process includes: operating a mill in a milling phase with an operating medium selected from the group consisting of gas, vapor, steam, a gas containing steam and mixtures thereof, and heating a milling chamber in a heat-up phase before the actual operation with the operating medium in such a way that a temperature in the milling chamber, the mill exit or both, is higher than a dew point of the operating medium.

Abstract: Hydrophilic precipitated silicas which combine a particularly low initial moisture content with low moisture absorption over time, a low tapped density and a low silanol group density, have the following physicochemical parameters: equilibrium moisture content (at 70% relative humidity/20° C.) of 0.5%-5.0% by weight, based on the weight of the hydrophilic precipitated silica, BET surface area of 50-250 m2/g, CTAB surface area of 50-250 m2/g, and DBP (anhydrous) of 200-350 g/100 g.

Abstract: Precipitated silicas having an SiOHisolated absorbance ratio of greater than or equal to 1, may be used as reinforcers and thickeners for sealants.

Abstract: The invention relates to hydrophobicized precipitated silicas that possess an extremely high whiteness and extremely low moisture absorption. The hydrophobic precipitated silicas are prepared, inter alia, by coating with silicone oil and oxidative heat treatment.

Abstract: A hydrophobic precipitated silica is prepared by a process comprising: a) preparing a mixture of an organopolysiloxane derivative and a precipitated silica; b) conditioning the mixture obtained at a temperature ranging from 10 to 150° C. for a period ranging from 0.5 to 72 h, and c) conducting oxidative heat treatment under fluid conditions at a temperature more than 300° C. with an oxidizing gas.

Abstract: The invention relates to hydrophobicized precipitated silicas that possess an extremely high whiteness and extremely low moisture absorption. The hydrophobic precipitated silicas are prepared, inter alia, by coating with silicone oil and oxidative heat treatment.

Abstract: A room temperature crosslinking, one component (RTV 1C) silicone rubber formulation with hydrophobic, silica featuring extremely low water absorption, a high level of whiteness, and fine-tunable, storage-stable rheological properties with a high reinforcing action in the silicone rubber vulcanizate contains A) from 0.5 to 60% by weight of a hydrophobic silica having the following properties: a carbon content of >3.1%; a methanol wettability of >60%; a reflectance of >94%; a BET/CTAB ratio of from >1 to <3; a DBP absorption of <230 g/100 g; a BET surface area of from 50 to 110 m2/g; a CTAB surface area of >30 m2/g; a water vapor absorption at 30° C. at an ambient humidity of 30 of <1.3; a water vapor absorption at 30° C. at an ambient humidity of 70 of <1.7; and B) 40-99.

Abstract: Precipitated silicas with a high pH and their use in applications as defoamers having optimum silanol group density and a process for preparing precipitated silicas and to their use, particularly in defoamer formulations.

Abstract: Hydrophobic precipitated silicas with a high pH and low silanol group density, a process for preparing them and their use, particularly in deformer formulations.