Patent ID: 6423794
Filing Date: 2002-07-23
Classification: C08F

Abstract:
A process for the production of polyethylene, comprising the step of contacting, at a temperature of about âˆ’100Â° C. to about +200Â° C., ethylene and a Ti, Cr, V, Zr, Hf or Ni complex of a ligand of the formula wherein:T is hydrocarbylene, substituted hydrocarbylene or â€”CR9R10â€”; R2 is hydrogen, hydrocarbyl or substituted hydrocarbyl; R3 is independently hydrocabyl or substituted hydrocarbyl, and R4 is hydrogen, hydrocabyl or substituted hydrocarbyl, provided that a carbon atom bound to a nitrogen atom has at least two other carbon atoms bound to it, or provided that both R3 and R4 are ethyl; R5 and R6 are hydrogen; R7 and R8 are each independently hydrocarbyl or substituted hydrocarbyl, provided that a carbon atom bound to a phosphorous atom has at least two other carbon atoms bound to it; R9 and R10 are each independently hydrogen, hydrocarbyl or substituted hydrocarbyl; R11 and R12 are each independently hydrocarbyl or substituted hydrocarbyl; R13 is hydrocarbyl or substituted hydrocarbyl; provided that R2 and R9 taken together may form a ring; and provided that, when (I) is a Ni complex, R11 and R12 are both t-butyl and/or T is not o-phenylene.