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 IN A TWO-PHASE SYSTEM AND TRANSFERS THE ORGANIC RUBBER PHASE IN A NON-AGGRESSIVE MANNER INTO THE INORGANIC FILLER SUSPENSION, WITHOUT ADDITION OF CHEMICALS, AND FORMS THE RUBBER/CARBON BLACK COMPOSITE, AND COMPRISES MEASURES TO BE TAKEN TO AVOID CLUMPING OF PRODUCT IN THE AQUEOUS PHASE. AFTER MECHANICAL WATER REMOVAL AND THERMAL DRYING, THE PRODUCTS ARE FREEFLOWABLE, STORAGE-STABLE POWDERS OR PELLETS AND ARE MARKEDLY SUPERIOR TO THE STANDARD BOTH IN THEIR PROCESSING AND IN THEIR RUBBER-TECHNOLOGY PROPERTY PROFILE.