C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 8/04 (2006.01) C08L 19/02 (2006.01)
Patent
CA 2436875
The invention concerns a selective hydrogenation method for olefinic double bonds of block copolymers whereof at least one block contains olefinic double bonds using a catalyst based on a group VIII metal in a medium comprising an organic solvent for the copolymer and an ionic liquid as solvent of the catalyst, which consists in: using a water-immiscible ionic liquid, preferably an ionic liquid whereof the anion is the hexafluorophosphate anion and the cation is the 1-butyl-3-methyl-imidazolium (bmim?+´) or 1 ethyl-3-methyl-imidazolium (emim?+´). Said method, when used for poly(styrene)-b-poly(butadiene)-b-poly(methyl methacrylate) block polymers whereof the poly(butadiene) block has in majority a 1,4 microstructure, enables to obtain copolymers whereof the hydrogenation rate is not less than 50 % and having a melting point higher than 30 ~C.
Pour hydrog~ner s~lectivement les doubles liaisons ol~finiques de copolym~res ~ blocs dont au moins un bloc contient des doubles liaisons ol~finiques ~ l'aide d'un catalyseur ~ base d'un m~tal du groupe VIII dans un milieu comprenant un solvant organique pour le copolym~re et un liquide ionique comme solvant du catalyseur, on utilise un liquide ionique non miscible ~ l'eau, de pr~f~rence un liquide ionique dont l'anion est l'anion hexafluorophosphate et le cation est le cation 1-butyl-3-m~thyl-imidazolium (bmim+~) ou 1-~thyl-3- m~thyl-imidazolium (emim+~). Appliqu~ aux copolym~res ~ blocs poly(styr~ne)-b- poly(butadi~ne)-b-poly(m~thacrylate de m~thyle) dont le bloc poly(butadi~ne) poss~de majoritairement une microstructure -1,4, ce proc~d~ conduit ~ des copolym~res dont le taux d'hydrog~nation est au moins ~gal ~ 50% et qui pr~sentent un point de fusion sup~rieur ~ 30 ~C.
Bonnet Philippe
Boussand Beatrice
Court Francois
Devic Michel
Hidalgo Manuel
Atofina
Robic
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