Polymerization method

Method of polymerisation, preferably for obtaining a polymer which is a polyester or a polycarbonat or a mixed-polymer thereof, comprising the step of polymerising at least one type of monomer selected from the group consisting of a monomer of formula I

• a monomer of formula II
• and a monomer of formula III
• wherein for each of formulae I, II, III independently,
• n=0, 1 or 2. It is particularly preferred that in formula II n is preferably 1 or 2, more preferably is 1, and/or that in formula III, n is preferably 1;
• R1.n, R2, R3 and R4, independently, represent H, C1-C25 linear, branched or cyclic alkyl, C5-C25, preferably C6-C14, alkylaryl, aralkyl or aryl, wherein the alkyl and/or the aryl moieties may be, individually, further substituted with halogeno, preferably CI or F, or wherein the alkyl may comprise an oxirane, ether, amido, amidino, alkenyl or alkinyl moiety;
• in the presence of a cationic initiator complex of formula IV
• (Lm M-Ra)+ IV
• or of formula V
• (Lm M-O—Ra)+ V
• wherein
• L represents a neutral, monodentate ligand;
• m=1, 2, 3 or 4;
• M represents a zinc, magnesium or calcium atom, preferably a zinc atom, having an oxidation state of +11;
• Ra represents an organic radical which is linear, branched or cyclic, preferably linear, C1-20alkyl, preferably C1-C10alkyl, or Si1-Si10silyl, C6-C14 alkylaryl, aralkyl or aryl, and wherein the alkyl or aryl moieties may be, individually, further substituted with halogeno, preferably F or CI, and wherein the aryl moieties may comprise N- and/or O-heteroaromatic aryl (i.e. an N- or O-containing heteroaryl moiety), and wherein the alkyl, silyl or aryl moieties may be, individually, further substituted with —NRbRc, —COO—Rb, -0-C(=0)-Rb, —NH—C(=0)-Rb, —C(=0)NH—Rb, —OH, —NHC(=0)NHRb, —OBoc, —NHBoc, (-(0)vSi[-(0)xRb][-(0)yRc][-(0)zRd])i with the proviso that v, x, y, z are, individually, 0 or 1, and that 1 is 1, 2, 3, 4 or 5;
• or wherein, when the complex is of formula V, the alkyl, silyl c, or aryl moieties may be, individually, further substituted with —O—Rb, —S—Rb or —PRbRc,
• wherein Rb, Rc, Rd, individually, are CI-CI 4 alkyl or C6-C14 aryl, arylalykl or aralkyl, which alkyl or aryl moieties may be further substituted with halogeno, preferably CI or F;
• and wherein, when the polymerisation reaction is carried out with a cationic initiator complex of formula IV, then either the reaction is carried out in the further presence of an alcohol of formula VI
• Ra—OH, VI
• or that the initiator complex is preincubated with an alcohol of formula VI, or both.