Preparation of block copolymers by ionic polymerization
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United States of America Patent
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Dec 24, 1996
Grant Date -
N/A
app pub date -
Oct 13, 1993
filing date -
Oct 14, 1992
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Expired
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Abstract
In a process for preparing block copolymers of styrene or its equivalents on the one hand and of butadiene or its equivalents on the other hand by sequential anionic polymerization, in which a first monomer and the organometallic compound serving as initiator are first of all combined to form a reaction mixture and the reaction is continued until at least part of the first monomer has been consumed, and then at least one further monomer is added and is in each case partially or completely reacted, the polymerization is carried out continuously in a conventional manner in a tubular reactor, the reaction of in each case one monomer being carried out in each case in one reactor section and at least two reactor sections being separated by a mixing stretch.
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