| abstract |
Olefin co- or homopolymers having a good molecular weight andnshort chain branching may be prepared in the presence of a tridentatencomplex of a Group 8, 9 or 10 metal of the formula:n nwherein M is a Group 8, 9 or 10 metal; W is selected from the groupnconsisting of a sulfur atom, an oxygen atom and a phosphorus atom; Ynand Z are independently selected from the group consisting of a carbonnatom, a phosphorus atom and a sulfur atom; when Y is phosphorus m is 2,nwhen Y is carbon or sulfur m is 1; when Z is phosphorus n is 2, when Z isncarbon or sulfur n is 1; each R is independently selected from the groupnconsisting of a hydrogen atom, and a hydrocarbyl radical or R takenntogether with Q may form a cyclic hydrocarbyl; R 1 and R 2 arenindependently selected from the group consisting of a hydrogen atom, ansubstituted or unsubstituted hydrocarbyl radical which may contain one ornmore heteroatoms which may be bonded directly or indirectly to the nnitrogen atoms and a tri-C 1-4 alkyl silyl radical; Q is a divalent unsaturatednhydrocarbyl radical or a divalent radical comprising hydrogen, carbon andnone or more heteroatoms selected from the group consisting of an oxygennatom, a nitrogen atom, a sulfur atom and a boron atom, and Q when takenntogether with W forms one or more unsaturated rings, which unsaturatedncyclic rings may be unsubstituted or may be fully substituted by one ornmore substituents independently selected from the group consisting of anhalogen atom and an alkyl radical, L is an activatable ligand and p is anninteger from 1 to 3. |