There is a process for the preparation of polypropylene carbonate having the step of copolymerization of propylene oxide and carbon dioxide (CO
2
) in the presence of a catalytic system including:
at least one catalyst selected from complexes of a transition metal having general formula (I):
at least one co-catalyst selected from:
(a) ionic compounds having general formula (II):
and
(b) ionic compounds having general formula (III)