Process for the preparation of a block copolymer composition
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United States of America Patent
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Nov 30, 1999
Grant Date -
N/A
app pub date -
Jul 14, 1998
filing date -
Aug 27, 1997
priority date (Note) -
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Abstract
This invention relates to a process for preparing a block copolymer composition, wherein it comprises following successive steps: a step in which a vinyl aromatic monomer is polymerized in a reactor in the presence of an inert hydrocarbon solvent and organolithium initiator until depletion of the monomer to generate a living polymer; a step in which a conjugated diene monomer is added to the above polymer to synthesize a living diblock copolymer; a step in which a portion of polymerization terminator is added to partially inactivate the living diblock copolymer; steps in which a conjugated diene monomer and aromatic vinyl monomer are sequentially added to generate a mixture of living triblock copolymer and inactivated diblock copolymer; a step in which a polymerization terminator is added to complete the reaction. This invention has advantages of providing easy, wide-range and fine control of block copolymer compositions in a reactor via well-controlled termination reactions during the sequential block copolymerization.
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