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AssigneeBASF SE
InventorsWolfgang Fischer, Konrad Knoll, Wolfgang Loth, Volker Warzelhan, Alain Deffieux, Philippe Desbois, Michel Fontanille, Stefan Lätsch, Christian Schade, Hermann Gausepohl
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A process for the continuous anionic polymerization or copolymerization of styrene or diene monomers using an alkali metal alkyl compound as polymerization initiator is carried out in the presence of an alkyl- or arylmetal compound of an element which occurs in at least divalent form as rate regulator, preferably under non-isothermal conditions and without back-mixing in a tubular or tube-bundle reactor, preferably using an alkyl- or arylmetal compound A of the formula R1M1 and an alkyl- or arylmetal compound B of the formula R2nM2 in a molar ratio between B and A of from 0.1:1 to 500:1, where M1 is Li, Na or K; R1 is hydrogen, C1-C20-alkyl, C6-C20-aryl, or C7-C20-alkyl-substituted aryl; M2 is an n-valent element from group 2a, 2b or 3a of the Periodic Table; and R2 is hydrogen, halogen, C1-C20-alkyl or C6-C20-aryl; and a special anionic polymerization initiator containing no Lewis base.
A process for the continuous polymerization of styrene monomers or block copolymerization of styrene and diene monomers using an alkali metal alkyl or aryl compound A as polymerization initiator, which comprises carrying out the polymerization in the presence of an alkyl- or arylmetal compound B of the formula R2nM2 as rate regulator, where
An initiator for anionic polymerization, consisting of an alkyl- or arylmetal compound A of the formula R1M1 and an alkyl- or arylmetal compound B of the formula R1nM2 in a molar ratio between B and A of from 10:1 to 100:1 is used, where
Dependencies are inferred from the claim text.