abstract |
The present invention relates to solid silicic acid preparations, consisting of the components (A) 20 to 80 wt.-%, relative to the total weight of the preparation, of a silicic acid; (B) 20 to 50 wt.-%, relative to the total weight of the preparation, of at least one additive selected from the group consisting of a water-soluble nonionic surfactant additive based on polyethers, a water-soluble surfactant additive containing carboxylate groups, a polyurethane, an anionic surfactant additive based on acid phosphoric acid, phosphonic acid, sulfuric acid, or sulfonic acid esters; (C) optionally further components, wherein said further components do not contain pigments and the sum of all components (A), (B), and (C) is 100 wt.-%. In addition, the invention relates to methods for the production thereof and methods for coloring high-molecular-weight organic or inorganic materials, in particular for coloring plastics. |