Living olefin polymerization processes

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 4/76 (2006.01) B01J 31/22 (2006.01) C07F 7/00 (2006.01) C07F 19/00 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2285964

Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms. The ligand is bonded to the metal atom through two anionic or covalent bonds and a dative bond. The initiators are particularly stable under reaction conditions in the absence of olefin monomer. The processes provide polymers having low polydispersities, especially block copolymers having low polydispersities. It is an additional advantage of these processes that, during block copolymer synthesis, a relatively small amount of homopolymer is formed.

Cette invention se rapporte à des procédés permettant de réaliser la polymérisation vivante de monomères d'oléfines avec des liaisons doubles carbone-carbone terminales. Ces procédés utilisent des initiateurs qui contiennent un atome métal et un ligand contenant deux atomes du groupe 15 et un atome du groupe 16 ou trois atomes du groupe 15. Ce ligand est lié à l'atome métal par deux liaisons anioniques ou covalentes et par une liaison bipolaire. Ces initiateurs sont particulièrement stables dans des conditions de réaction en l'absence de monomères d'oléfines. Ces procédés fournissent des polymères présentant des polydispersités basses, notamment des copolymères blocs possédant des polydispersités basses. Ces procédés ont l'avantage supplémentaire de ne former, pendant la synthèse des copolymères blocs, qu'une quantité relativement faible d'homopolymères.

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