Transparent block copolymers and production thereof
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United States of America Patent
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Jan 31, 2006
Grant Date -
Jul 29, 2004
app pub date -
Oct 9, 2003
filing date -
Oct 11, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a novel transparent block copolymer and its process for the manufacture. The process comprises a first partial killing of at least the living copolymeric species R-S1-B1-M with a multi-functional deactivation agent where S1 is a monovinyl-substituted aromatic homopolymer, B1, is a conjugated diene homopolymer, M is an alkali metal and R is an alkyl (RM being an initiator) and further comprises a second total deactivation of at least the living tapered block copolymeric species R-S1-B1-B2/S2-M (obtained by adding a feed B2/S2 to the reaction medium) by a mono-functional deactivation agent (the terminating agent).
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