Patent ID: 6255414
Filing Date: 2001-07-03
Classification: C07F,C08F

Abstract:
A process for the polymerization of olefins, comprising the step of contacting, at a temperature of about -50.degree. C. to about +250.degree. C.:(a) an olefin selected from the group consisting of ethylene, an .alpha.-olefin, a styrene, a cyclopentene, and a norbornene; and(b) an active polymerization catalyst comprising a transition metal complex of a ligand of the formula (XI) ##STR16##wherein:said transition metal is Ti, Zr, Hf V, Cr, Sc, Y or a rare earth metal;R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each independently hydrocarbyl, substituted hydrocarbyl or silyl;R.sup.15 is o-phenylene, 1,2-naphthylene, 2,3-naphthylene, 1,8-naphthylene, 1,2-cyclohexylene, ##STR17## ##STR18##--CR.sup.16.sub.2 (CR.sup.16.sub.2).sub.q CR.sup.16.sub.2 --(XV), or a divalent organic moiety containing one or more nitrogen atoms;R.sup.1, R.sup.6, R.sup.7 and R.sup.8 are each independently hydrogen, hydrocarbyl or substituted hydrocarbyl, provided that either or both of the pairs R.sup.5 and R.sup.6, and R.sup.7 and R.sup.8 taken together may form a ring;R.sup.9, R.sup.10, R.sup.11 and R.sup.12 are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl, or a functional group, provided that any two of R.sup.9, R.sup.10, R.sup.11 and R.sup.12 vicinal to one another may form a ring;R.sup.16 is hydrogen and q is 4.