Pulverulent rubbers comprising carbon black fillers and based on rubbers present in organic solvents, process for their preparation, and applications

摘要

The invention relates to a process for preparing fine-particle free-flowing rubber powders, composed of carbon black fillers and a rubber, prepared by solution polymerization. The process operates on the basis of a two-phase system involving transfer of the organic rubber phase in a non-aggressive manner into the inorganic filler suspension, without addition of chemicals. A rubber/carbon black composite is formed. The process comprises measures to avoid clumping of product in the aqueous phase. After mechanical water removal and thermal drying, the product obtained flows freely and is a storage-stable powder or pellet and are markedly superior to the standard both in their processing and in their rubber-technology property profile.