Patent ID: 6444762
Filing Date: 2002-09-03
Classification: C08F

Abstract:
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, whereM2 is an n-valent element from group 2a, 2b or 3a of the Periodic Table, with the exception of boron; and R2 independently of one another are hydrogen, halogen, C1-C20-alky or C6-C20-aryl, wherein the initiator contains no Lewis base with the proviso that at least one radical R2 is C1-C20 or C6-C20-aryl.