SILICAS

摘要

An amorphous silica has a pore size distribution wherein 90 % of the pores have a diameter above 15 nanometers, and less than 20 % of the pore volume is in pores having a pore diameter between 10 and 30 nanometers, the amorphous silica having a CTAB surface area of less than 100 m<2>/g, the amorphous silica having a matting efficiency of below 20 gloss units at an incidence angle of 60 DEG and a loading of 5 % by weight. It can be prepared by a precipitation route. It is used in thixotropic paints and lacquers.