| 摘要 |
<p>New methods of treating silica wetcake during precipitated silica materials manufacturing are provided. Such methods permit a significant increase in high solids content processing while simultaneously reducing high viscosity of the resultant particles for transport facilitation. The resultant precipitated silica wetcake is treated with a borate-containing dispersant to impart the necessary low viscosity characteristics thereto. Such a dispersant accords not only such a viscosity result, but will not char or otherwise discolor the silica particles during evaporation of the liquids within the wetcake itself. Furthermore, such a dispersant, if left on the surfaces of such particles, will not deleteriously affect the abrasivity, fluoride compatibility, or other dentifrice properties of the precipitated silica materials themselves. Also encompassed within this invention are the resultant precipitated silica particles exhibiting borate residues and dentifrices including such materials.</p> |
