NOVEL COMPLEXES AND METHOD FOR SYNTHESIS OF GROUP 4 ORGANOMETALLICS GRAFTED ON ANIONS. METHOD FOR OLIGOMERISATION AND POLYMERISATION OF OLEFINS

摘要

Novel group 4 organometallic compounds, supported on anions by means of at least one covalent metal-oxygen bond, are obtained by reaction of at least one borate or aluminate comprising at least one hydroxy group with at least one group 4 transition metal compound. Said compounds are used in a catalytic composition of application in a method for oligomerisation or polymerisation of olefins.