Abstract:
A method is disclosed for the polymerization of isobutylene and, in particular, the copolymerization of isobutylene and isoprene, by contacting the monomers with a catalyst system constituted by (a) an organoaluminum compound (e.g., Al(C2H5)2Cl) and (b) an oxide or anhydride of an element belonging to Group VI B or VII B of the periodic system (e.g., SO2), in a liquid reaction medium, wherein the molar ratio of compound (b) to compound (a) is less than 1, at a temperature in the range of about -40* to +15*C.
Abstract:
A process is disclosed whereby butyl rubber of high molecular weight and excellent physical characteristics is readily prepared by copolymerizing isobutylene and isoprene in the presence of a catalyst system consisting of: A. A METALORGANIC COMPOUND (E.G., Al Et2 Cl); and B. AN ORGANIC COMPOUND HAVING FROM 1 TO 24 CARBON ATOMS AND AN ELECTRON AFFINITY VALUE IN THE RANGE FROM 0.3 TO 2 ELECTRON VOLTS (E.G., 1.3.5.-TRINITROBENZENE).