The present invention relates to a Ziegler-Natta catalyst comprising a
solid, ligand-modified catalyst component formed at least from (a) a
compound of Group 1 to 3 of the Periodic Table (IUPAC), (b) a transition
metal compound of Group 4 to 10 of the Periodic Table (IUPAC), or a
compound of an actinide or lanthanide, (c) one or more organic ligand
compound(s) which is/are selected from organic compounds comprising a
cyclopentadienyl anion backbone, and (d) a compound of Group 13 of the
Periodic Table,wherein the catalyst component of said Ziegler-Natta
catalyst is formed in an emulsion/solidification method, to a process for
the production of such a catalyst, and to a process for the production of
an olefin (co-)polymer in the presence of such a catalyst.