Elf Atochem S.a.

Solvay (societe Anonyme)

Philippe Lecomte

Philippe Dubois

Robert Jerome

Philippe Teyssie

Henri Wautier

Thierry Senninger

Jean-Pierre Latere

Unsubstituted oxepane-diones useful as monomers for the production of polymers, process for the synthesis thereof by oxidation of unsubstituted cyclohexanediones, process for the preparation of polyesterketone polymers by polymerization of cyclic esterketones and polyesterketone polymers so obtained.

Cyclic esterketone compounds, processes for the synthesis thereof and process for the preparation of poly (esterketone) polymers

This process is characterized by the fact that at least one of the said monomers is polymerized or copolymerized in bulk, solution, emulsion or suspension, at a temperature that can be as low as 0.degree. C., in the presence of an initiation system including: at least one compound generating radicals, other than bromofluorene, and at least one catalyst consisting of a complex of palladium in the 0 oxidation state, denoted by the following formula (I): Pd(0)L.sup.1 L.sup.2 L.sup.3 L.sup.4 in which each of L.sup.1, L.sup.2, L.sup.3 and L.sup.4, which are identical or different, denotes a ligand which may be a chiral ligand, which is chosen from PRR'R', P(OR)(OR')(OR'), NRR'R', ORR', SRR', SeRR', AsRR'R', SbRR'R', where each of R, R' and R' independently denotes a C.sub.1 -C.sub.14 alkyl group, optionally substituted, or an optionally substituted aromatic group, it being possible for at least two of these ligands to be joined to one another by one or more divalent radicals.

Process for controlled radical polymerization or copolymerization of

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Cointe, Belgium

Philippe Lecomte