POLYDISPERSITY-CONTROLLED ISOOLEFIN POLYMERIZATION WITH POLYMORPHOGENATES

摘要

The disclosure provides for a process and polymerization system to produc e isoolefin polymers (72) utilizing polymorphogenates (16, 26) in the cataly st system to control polydispersity (MWD). The disclosure also provides a ca talyst system (20) comprising a plurality of active catalyst complex species (34) formed by combination of a Lewis acid (24), an initiator (22) and a po lymorphogenate (26), as well as polymers made using the catalyst system or p rocess. The polymorphogenate (16, 26) can promote or mimic the formation of different active catalyst complex species (34) having different polymerizati on rates, i.e. different rates of propagation, chain transfer, or terminatio n, as observed by different polydispersities resulting from the presence of relatively different proportions of the polymorphogenate.