abstract |
IN A FRIEDEL-CRAFTS CATALYSED POLYMERISATION IN WHICH, FOR EXAMPLE, ALUMINIUM CHLORIDE IS USED TO CATALYSE THE POLYMERISATION OF AN UNSATURATED PETROLEUM FRACTION TO PRODUCE A PETROLEUM RESIN, THE IMPROVED CATALYST COMPLEX COMPRISES ALUMINIUM CHLORIDE/HYDROGEN CHLORIDE AND A BENZENE SUBSTIUTED BY AT LEAST ONE SECONDARY OR TERITARY ALKYL GROUP, E.G. CUMENCE OR P-CYMENE, OR CYCLOALKYL GROUP. |