Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2009-12-11
2011-12-06
Jagannathan, Vasu (Department: 1764)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S333400, C525S356000, C525S357000, C525S370000, C525S355000, C525S371000, C525S359200, C525S359300, C525S359400, C525S359500, C525S359600, C526S346000, C526S237000, C526S347200
Reexamination Certificate
active
08071688
ABSTRACT:
Concurrently fed into a reaction zone held at about 10° C. or less are brominating agent, aluminum halide catalyst, and a solution of anionic styrenic polymer having a GPC Mn about 2000-30,000. The components are in at least two separate feed streams. The feeds are proportioned to maintain (a) the amount of aluminum halide being fed at about 0.8 mole percent or less based on the amount of aromatic monomeric units in the polymer being fed, and (b) amounts of brominating agent and unbrominated polymer in the reaction zone that produce a final washed and dried polymer product containing about 60-71 wt % bromine. The catalyst is deactivated, bromide ions and catalyst residues are washed away from the reaction mixture, and the brominated anionic styrenic polymer is recovered and dried. The dried polymer has a volatile bromobenzene content of about 600 ppm (wt/wt) or less as well as other beneficial properties.
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Balhoff John F.
Berdon Martin B.
Kolich Charles H.
Lin Ronny W.
Albemarle Corporation
Boyle Robert C
Jagannathan Vasu
Kliebert Jeremy J.
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