| 摘要 |
Preparing dispersion comprising precipitated silicic acid, comprises (a) preparing a pre-dispersion of at least one precipitated silicic acid, and (b) supplying the pre-dispersion to a grinding apparatus with subsequent grinding. At least one part of the surface of the precipitated silicic acid particles during the grinding process, and/or a newly generated surface of the precipitated silicic acid particles during the grinding is modified with at least one aminosilane so that the aminosilane is covalently bonded to the precipitated silicic acid particles. An independent claim is also included for a dispersion of precipitated silicic acid, comprising (i) at least one aminosilane covalently bonded to at least some parts of the surface of the precipitated silicic acid particles, where (i) average diameter (d 50) of the surface-modified precipitated silicic acid particles is 50-500 nm, preferably 110-160 nm and the d 90value of the particle size distribution curve of the surface-modified precipitated silicic acid particles is 150-800 nm, preferably 150 to less than 200 nm, (ii) the solid content of the dispersion is >= 20 wt.% and the pH of the dispersion is = 5. |
