Process for preparing hydrocarbon drying oil product by co-polymerizing a butadiene and styrene

Claim 1

PROCESS FOR PRODUCING A POLYMERIC HYDROCARBON DRYING OIL WHICH COMPRISES CONTINUOUSLY ADDING A FEED MIXTURE OF 75 TO 85 PARTS OF BUTADIENE, 25 TO 15 PARTS OF STYRTENE, 200 TO 300 PARTS OF AN INERT HYDROCARBON DILUENT BOILING BETWEEN 150 AND 200*C., ABOUT 5 TO 50 PARTS OF AN ETHER MODIFIER HAVING 2 TO 8 CARBON ATOMS PER MOLECULE, CHOSEN FROM THE GROUP CONSISTING OF ALKYL ETHERS AND CYCLIC DIETHERS HAVING THE OXYGEN ATOMS SEPARATED BY AT LEAST TWO CARBON ATOMS, AND ABOUT 1 TO 5 PARTS OF FINELY DIVIDED ALKALI METAL CATALYST, AND 10 TO 50% OF AN ALCOHOL, BASED ON ALKALI METAL, TO A FIRST POLYMERIZATION ZONE, REACTING SAID MIXTURE WITHOUT FURTHER ADDITION OF FEED AND CATALYST UNTIL A CONVERSION OF 40-80% IS OBTAINED AT TEMPERATURE OF 55-75*C., THEN COMMENCING THE CONTINUOUS INTRODUCTION OF FEED AND CATALYST, CONTINUOUSLY PASSING THE REACTANTS TO A SECOND POLYMERIZATION ZONE QHILE CONTINUING THE REACTION IN THE FIRST ZONE BY THE INTRODUCTION OF FEED AND CATALYST, MAINTAINING THE REACTION IN THE SECOND ZONE AT A TEMPERATURE OF 60-75* C. AND THEN COMPLETING THE CONVERSION IN A THIRD ZONE AT A TEMPERATURE OF 65-80*C. WHILE CONTINUING THE POLYMERIZATION IN THE FIRST TWO ZONES.