Process for the continuous production of homogeneous rubber-silica mixtures

Claim 1

PROCESS FOR THE CONTINUOUS PRODUCTION OF A HOMOGENEOUS COMPOSITION OF SYNTHETIC RUBBER AND SILICA WHICH COMPRISES PASSING A MIXTURE COMPRISING A LATEX OF A SYNTHETIC RUBBER, AN ALKALI METAL SILICATE SOLUTION AND A NEUTRAL ALKALI METAL CATION ELECTROLYTE CONTINOUSLY THROUGH A SERIES OF AT LEAST SIX INTERCONNECTED COMPARTMENTS, STIRRING SAID MIXTURE IN SAID COMPARTMENTS, ADDING ACID IN SUBSTANTIALLY EQUAL AMOUNTS TO SAID MIXTURE IN SAID COMPARTMENTS IN TOTAL QUANTITY SUFFICIENT TO BRING THE MIXTURE TO A PH VALUE OF FROM 9 TO 7 BEFORE THE REACTION MIXTURE LEAVES SAID COMPARTMENTS, WITHDRAWING THE MIXTURE FROM SAID COMPARTMENTS, HEATING THE MIXTURE AT FROM 80* TO 100* C. AND HOLDING IT AT THIS TEMPERATURE FOR FROM 10 TO 120 MINUTES, ADJUSTING THE PH VALUE OF THE MIXTURE TO FROM 3 TO 2, AND FILTERING, WASHING AND DRYING THE RESULTING PRECIPITATE.