| abstract |
New transition metal cpds. are of formula (I) Ln(XmAtR1q)sMYr (I) where M= Gp. IIIb, IVb, Vb or VIb metal; L = pi -ligand or electron donor; n = 1, 2, 3 or 4; Y = H, halogen or a l-dentate 1-40C gp. (with l = 1, 2, 3 or 4); at least one gp. L carries a gp. XmAtR1q; r = 0, 1, 2, 3, 4 or 5; X = hetero atom or a 1-40C gp.; m = 0 or 1; A = Gp. IIIa, Va or VIa element; t = 1; R1 = a 1-40C gp.; q = 1, 2, 3, 4 or 5; s = 1-20. Also claimed is (i) a catalyst contg. cpd(s). (I), and (ii) a process for the polymerisation of olefins in the presence of this catalyst. |