Low-temperature polymerization process for unsaturates

Claim 1

A PROCESS FOR COPOLYMERIZING A MIXTURE OF 70 TO 99% ISOBUTYLENE AND 30 TO 1.0% OF A MATERIAL CHOSEN FROM THE CLASS CONSISTING OF STYRENE AND A MULTIOLEFIN HAVING MORE THAN 1 CARBON TO CARBON DOUBLE BOND LINKAGE PER MOLECULE AND FROM 4 TO 14 CARBON ATOMS PER MOECULE COMPRISING THE STEPS OF POLYMERIZING THE MIXTURE AT A TEMPERATURE BETWEEN - 40 AND -164*C. IN THE PRESENCE OF A DISSOLVED FRIEDEL-CRAFTS CATALYST, A HYDROCARBON AS SOLVEN FOR THE POLYMER WHICH SOLVENT IS LIQUID AT THE REACTION TEMPERATURE AND AN ALKYL HALIDE NON-SOLVENT FOR THE POLYMER WHICH NON-SOLVENT IS A LIQUID AT THE REACTION TEMPERATURE, WHEREBY THE SOLID POLYMER IS SUFFICIENTLY SOLVATED TO PERMIT A READY CLEARING OF THE REACTOR WITHOUT PRODUCING A HIGH-VISCOS ITY MIXTURE, THE SAID SOLVENT AND NONSOLVENT BEING MIXED IN A PROPORTION WITHIN THE RANGE OF EQUAL PARTS OF NONSOLVENT AND SOLVENT TO 1/3 SOLVENT AND 2/3 NONSOLVENT, THE MIXTURE BEING PRES ENT IN AN AMOUNT SUCH AS TO PROVIDE IN THE POLYMERIZATION MIXTURE FROM 15 TO 35% OF NONSOLVENT.