Abstract: The present invention relates to a process for preparing polycarbonate comprising copolymerizing an epoxy compound and carbon dioxide (CO2) in the presence of a catalytic system comprising: at least one catalyst selected from complexes of a transition metal; at least one co-catalyst selected from ionic compounds, as well as to a catalytic system comprising: at least one catalyst selected from complexes of a transition metal; at least one co-catalyst selected from ionic compounds.

Abstract: There is a process for the preparation of polypropylene carbonate having the step of copolymerization of propylene oxide and carbon dioxide (CO2) 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)

Abstract: Elastomeric copolymer with a high sulfur content, comprising sulfur in a quantity higher than or equal to 40% by weight, preferably ranging from 55% by weight to 90% by weight, with respect to the total weight of said elastomeric copolymer, and at least one monomer having general formula (I): CH2?CH—(CH2)y-(X)n-(X)m-(CH2)x—CH?CH2 (I) wherein: X represents a sulfur atom, a selenium atom, a tellurium atom, preferably a sulfur atom, a selenium atom; y and x, equal to or different from one another, are a whole number ranging from 0 to 4; n and m, equal to or different from one another, are a whole number ranging from 0 to 3, at least one of n and m being equal to 1; said monomer being present in a quantity lower than or equal to 60% by weight, preferably ranging from 10% by weight to 45% by weight, with respect to the total weight of said elastomeric copolymer; provided that, in the case wherein in said general formula (I) X is sulfur, y and x are 1, at least one of n and m must be different from 1 and the sum of

Abstract: The present invention relates to a process for preparing polycarbonate comprising copolymerizing an epoxy compound and carbon dioxide (CO2) in the presence of a catalytic system comprising: at least one catalyst selected from complexes of a transition metal; at least one co-catalyst selected from ionic compounds, as well as to a catalytic system comprising: at least one catalyst selected from complexes of a transition metal; at least one co-catalyst selected from ionic compounds.