| 摘要 |
The invention concerns thickening precipitated silica having a median diameter of at least 100 mu m and cohesion factor FC of at least 0.3, obtained by wet process granulation of thickening precipitated silica, drying and optionally sieving, the granulation step being carried out in a low-shear granulation apparatus, using at least a precipitated silica powder (a), having a DOP of at least 230 ml/100g, a median diameter D>50a< of at least 14 mu m; particles of at least a precipitated silica (b) having a DOP of at least 230 ml/100g, a median diameter D>50b< of at least 0.3 mu m; and water (W) as binder, the dry extract of the mixture formed by the silicas (a) and (b) and water being between 25 and 40 wt. %, the weight ratio (a)/(b), expressed in dry weight, of silica (a) over silica (b) ranging between 1.5 and 6. The inventive granules are used as thickening agents with sensory effect in the mouth in dental compositions. |
