RUBBER POWDERS HAVING PULVERULENT SILICATIC FILLERS AND PREPARED FROM RUBBERS PRESENT IN ORGANIC SOLVENTS, PROCESS FOR PREPARATION THEREOF, AND USE THEREOF

摘要

PURPOSE: Provided are a process for preparing a rubber powder comprising a filler which has a silanol group and which has been modified using an organosilicon compound. CONSTITUTION: A process for preparing a fine-particle rubber powder, comprises: (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 a suspension; (b) adjusting a pH of the suspension to 5 to 10; (c) adding one or more rubbers in an organic solvent to the suspension; (d) removing the organic solvent, thereby obtaining rubber powder in water; (e) removing most of the water from the rubber powder then present in water; and (f) adjusting a residual moisture level of the rubber powder to 2% or less, thereby obtaining the fine-particles rubber powder; wherein the rubbers are prepared by solution polymerization and/or from rubber present in the organic solvent.