Amorphous submicron particles
View Patent ↗A process for milling amorphous solids using a milling apparatus can result in particles having a median particle diameter d 50 of <1.5 μm. 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.
1. Amorphous pulverulent solids having a median particle size d 50 (TEM) of <1.5 μm and/or a d 90 value (TEM) of <2 μm and/or a d 99 value (TEM) of <2 μm.
2. The amorphous solids according to claim 1 , which comprise a gel or a particulate solid containing aggregates and/or agglomerates.
3. The amorphous solids according to claim 1 , which are silica gels which additionally have a pore volume of 0.2 to 0.7 ml/g.
4. The amorphous solids according to claim 1 , which are silica gels which additionally have a pore volume of 0.8 to 1.5 ml/g.
5. The amorphous solids according to claim 1 , which are silica gels which additionally have a pore volume of 1.5 to 2.1 ml/g.
6. A coating system, comprising: an amorphous solid according to claim 1 .