Coupled styrenic block copolymers and process for preparing...

Details Coupled styrenic block copolymers and process for preparing... Coupled styrenic block copolymers and process for preparing...

2006-03-07

2006-03-07

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...

C525S316000, C525S250000, C525S366000

Reexamination Certificate

active

07009000

ABSTRACT:
Disclosed is an improvement to a process for preparing coupled styrenic block copolymers wherein adding from about 0.01 to about 1.5 equivalents of a metal alkyl compound per equivalent of living polymer chain ends to the cement, during or after polymerization, improves coupling efficiencies. The resultant radial styrenic block copolymers have reduced amounts of 5+ arm oligomers which can be very desirable is certain applications, such as the modification of bitumen.

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