Rubber powders having pulverulent silicatic fillers and prepared from rubbers present in organic solvents, a process for their preparation, and their use

A process for preparing a fine-particle rubber powder, comprising:

• a) suspending 1) one or more silicatic fillers and one or more bifunctional organosilicon compounds or 2) a silicatic filler modified with an organosilicon compound in water, thereby obtaining an aqueous suspension;
• b) adjusting a pH of the aqueous suspension to 5 to 10;
• c) adding a solution of one or more rubbers in an organic solvent to the aqueous suspension;
• d) removing the organic solvent, thereby obtaining rubber powder in water;
• e) removing most of the water from the rubber powder;
• and
• f) adjusting a residual moisture level of the rubber powder to ≦2%, thereby obtaining said fine particle rubber powder;
• wherein said rubbers are prepared by solution polymerization and/or from rubber present in the organic solvent.