Process for controlled radical polymerization or...

C - Chemistry – Metallurgy – 08 – F

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402/387

C08F 4/80 (2006.01) C08F 4/00 (2006.01)

Patent

CA 2200623

This process is characterized by the fact that at least one of the said monomers is polymerized or copolymerized in block, solution, emulsion or suspension at a temperature as low as 0 C in the presence of an initiating system consisting of: at least one radical-generating compound other than bromofluorene and at least one catalyst comprised of a palladium complex at degree of oxidation 0, represented by the following formula (I) Pd(0)L1L2L3L4, wherein L1, L2, L3 and L4, identical or different, each represent a ligand, which can be a chiral ligand, which is selected from PRR'R", P(OR)(OR')(OR"), NRR'R", ORR', SRR', SeRR', AsRR'R", SbRR'R", where each R, R', R" independently represents an optionally substituted alkyl group having 1 to 14 carbon atoms, or an optionally substituted aromatic group, at least two of the said ligands capable of being linked together by one or more bivalent radicals.

Ce procédé est caractérisé par le fait que l'on polymérise ou copolymérise en masse, solution, émulsion ou suspension, à une température pouvant descendre jusqu'à 0°C, au moins un desdits monomères en présence d'un système d'amorçage comprenant : au moins un composé générateur de radicaux autre que le bromofluorène ; et au moins un catalyseur constitué par un complexe du palladium au degré d'oxydation 0, représenté par la formule suivante (I) Pd(0)L1L2L3L4 dans laquelle L1, L2, L3 et L4, identiques ou différents, représentent chacun un ligand, pouvant être un ligand chiral, qui est choisi parmi PRR'R", P(OR)(OR')(OR"), NRR'R", ORR', SRR', SeRR', AsRR'R", SbRR'R", où chaque R, R', R" représente indépendamment un groupe alkyle en C1-C14, éventuellement substitué, ou un groupe aromatique éventuellement substitué, au moins deux de ces ligands pouvant être reliés entre eux par un ou plusieurs radicaux bivalents.

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