Process for the manufacture of a catalytic solid, catalytic solid and process for (co)polymerisation of olefins by means of this catalytic solid

摘要

Catalytic solid for the (co)polymerisation of at least one olefin, comprising a coprecipitate of magnesium and of at least one transition metal, obtained by means of a process comprising the preparation of a mixture of a magnesium compound, such as the chloride or a magnesium alcoholate, and of a compound denoted by one of the formulae MYx(O-R')t-x and M'Oy(O-R'')s-2y and the treatment of the resulting mixture with a complex of formula M''(A)Al2(X',X'')8 where X' and X'' denote halogens, M and M' transition metals of groups IVB and VB, M'' a transition metal of group IVB, A an aromatic hydrocarbon, Y a halogen or a group (O-R'''), and R', R'' and R''' an alkyl, aryl or cycloalkyl group.