Patent ID: 7256244

Claim:
A process for producing polymers having repeating units derived from at least one isoolefin monomer, at least one multiolefin monomer and, optionally, further copolymerizable monomers comprising: providing at least one isoolefin monomer, at least one multiolefin monomer, and, optionally, further copolymerizable monomers; and polymerizing the at least one isoolefin monomer, at least one multiolefin monomer, and, optionally, further copolymerizable monomers in the presence of from 5 to 500 ppm of at least one organic nitro containing compound or H—NO 2 and AlCl 3 /water in the absence of compounds selected from the group consisting of vanadium compounds, zirconium halogenid, and hafnium halogenides.