Transparent block copolymers and production thereof

Details Transparent block copolymers and production thereof Transparent block copolymers and production thereof

2006-01-31

2006-01-31

Seidleck, James J. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S098000, C525S271000, C525S316000

Reexamination Certificate

active

06992136

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 S1is 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/S2to the reaction medium) by a mono-functional deactivation agent (the terminating agent).

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