Patent ID: 6252021
Filing Date: 2001-06-26
Classification: C08F

Abstract:
A process for producing polyisobutene using isobutene as a monomer and a catalytic system comprising a transition metal compound expressed by the following formula (I), a benzene derivative compound expressed by the following formula (II) and methylaluminoxane expressed by the following formula (III), in the presence of non-halogenated solvent:MX.sub.4 (I)where, M is titanium, vanadium or tin;X is chlorine or bromine ##STR3##where, R.sub.1 is hydroxy or carboxy group;R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6, which are the same or different groups, represent hydrogen, methyl group, ethyl group, isopropyl group, isobutyl group, n-butyl group, t-butyl group, octyl group, alkoxy group, fluorine, chlorine, bromine, amino group, nitro group, hydroxy group or acetyl group ##STR4##where, n is an integer of 3 to 40.